1 // Copyright 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 // TODO(sgurun) copied from chrome/renderer. Remove after crbug.com/322276
7 #include "android_webview/renderer/print_web_view_helper.h"
11 #include "android_webview/common/print_messages.h"
12 #include "base/auto_reset.h"
13 #include "base/command_line.h"
14 #include "base/json/json_writer.h"
15 #include "base/logging.h"
16 #include "base/message_loop/message_loop.h"
17 #include "base/metrics/histogram.h"
18 #include "base/process/process_handle.h"
19 #include "base/strings/string_number_conversions.h"
20 #include "base/strings/stringprintf.h"
21 #include "base/strings/utf_string_conversions.h"
22 #include "content/public/renderer/render_thread.h"
23 #include "content/public/renderer/render_view.h"
24 #include "content/public/renderer/web_preferences.h"
25 #include "net/base/escape.h"
26 #include "printing/metafile.h"
27 #include "printing/metafile_impl.h"
28 #include "printing/units.h"
29 #include "skia/ext/vector_platform_device_skia.h"
30 #include "third_party/WebKit/public/platform/WebSize.h"
31 #include "third_party/WebKit/public/platform/WebURLRequest.h"
32 #include "third_party/WebKit/public/web/WebConsoleMessage.h"
33 #include "third_party/WebKit/public/web/WebDocument.h"
34 #include "third_party/WebKit/public/web/WebElement.h"
35 #include "third_party/WebKit/public/web/WebFrame.h"
36 #include "third_party/WebKit/public/web/WebFrameClient.h"
37 #include "third_party/WebKit/public/web/WebPlugin.h"
38 #include "third_party/WebKit/public/web/WebPluginDocument.h"
39 #include "third_party/WebKit/public/web/WebPrintParams.h"
40 #include "third_party/WebKit/public/web/WebPrintScalingOption.h"
41 #include "third_party/WebKit/public/web/WebScriptSource.h"
42 #include "third_party/WebKit/public/web/WebSettings.h"
43 #include "third_party/WebKit/public/web/WebView.h"
44 #include "third_party/WebKit/public/web/WebViewClient.h"
45 #include "ui/base/l10n/l10n_util.h"
46 #include "ui/base/resource/resource_bundle.h"
47 #include "webkit/common/webpreferences.h"
49 // This code is copied from chrome/renderer/printing. Code is slightly
50 // modified to run it with webview, and the modifications are marked
52 // TODO(sgurun): remove the code as part of componentization of printing.
58 enum PrintPreviewHelperEvents {
59 PREVIEW_EVENT_REQUESTED,
60 PREVIEW_EVENT_CACHE_HIT, // Unused
61 PREVIEW_EVENT_CREATE_DOCUMENT,
62 PREVIEW_EVENT_NEW_SETTINGS, // Unused
66 const double kMinDpi = 1.0;
69 // TODO(sgurun) android_webview hack
70 const char kPageLoadScriptFormat[] =
71 "document.open(); document.write(%s); document.close();";
73 const char kPageSetupScriptFormat[] = "setup(%s);";
75 void ExecuteScript(blink::WebFrame* frame,
76 const char* script_format,
77 const base::Value& parameters) {
79 base::JSONWriter::Write(¶meters, &json);
80 std::string script = base::StringPrintf(script_format, json.c_str());
81 frame->executeScript(blink::WebString(base::UTF8ToUTF16(script)));
85 int GetDPI(const PrintMsg_Print_Params* print_params) {
86 #if defined(OS_MACOSX)
87 // On the Mac, the printable area is in points, don't do any scaling based
89 return kPointsPerInch;
91 return static_cast<int>(print_params->dpi);
92 #endif // defined(OS_MACOSX)
95 bool PrintMsg_Print_Params_IsValid(const PrintMsg_Print_Params& params) {
96 return !params.content_size.IsEmpty() && !params.page_size.IsEmpty() &&
97 !params.printable_area.IsEmpty() && params.document_cookie &&
98 params.desired_dpi && params.max_shrink && params.min_shrink &&
99 params.dpi && (params.margin_top >= 0) && (params.margin_left >= 0);
102 PrintMsg_Print_Params GetCssPrintParams(
103 blink::WebFrame* frame,
105 const PrintMsg_Print_Params& page_params) {
106 PrintMsg_Print_Params page_css_params = page_params;
107 int dpi = GetDPI(&page_params);
109 blink::WebSize page_size_in_pixels(
110 ConvertUnit(page_params.page_size.width(), dpi, kPixelsPerInch),
111 ConvertUnit(page_params.page_size.height(), dpi, kPixelsPerInch));
112 int margin_top_in_pixels =
113 ConvertUnit(page_params.margin_top, dpi, kPixelsPerInch);
114 int margin_right_in_pixels = ConvertUnit(
115 page_params.page_size.width() -
116 page_params.content_size.width() - page_params.margin_left,
117 dpi, kPixelsPerInch);
118 int margin_bottom_in_pixels = ConvertUnit(
119 page_params.page_size.height() -
120 page_params.content_size.height() - page_params.margin_top,
121 dpi, kPixelsPerInch);
122 int margin_left_in_pixels = ConvertUnit(
123 page_params.margin_left,
124 dpi, kPixelsPerInch);
126 blink::WebSize original_page_size_in_pixels = page_size_in_pixels;
129 frame->pageSizeAndMarginsInPixels(page_index,
131 margin_top_in_pixels,
132 margin_right_in_pixels,
133 margin_bottom_in_pixels,
134 margin_left_in_pixels);
137 int new_content_width = page_size_in_pixels.width -
138 margin_left_in_pixels - margin_right_in_pixels;
139 int new_content_height = page_size_in_pixels.height -
140 margin_top_in_pixels - margin_bottom_in_pixels;
142 // Invalid page size and/or margins. We just use the default setting.
143 if (new_content_width < 1 || new_content_height < 1) {
144 CHECK(frame != NULL);
145 page_css_params = GetCssPrintParams(NULL, page_index, page_params);
146 return page_css_params;
149 page_css_params.content_size = gfx::Size(
150 ConvertUnit(new_content_width, kPixelsPerInch, dpi),
151 ConvertUnit(new_content_height, kPixelsPerInch, dpi));
153 if (original_page_size_in_pixels != page_size_in_pixels) {
154 page_css_params.page_size = gfx::Size(
155 ConvertUnit(page_size_in_pixels.width, kPixelsPerInch, dpi),
156 ConvertUnit(page_size_in_pixels.height, kPixelsPerInch, dpi));
158 // Printing frame doesn't have any page size css. Pixels to dpi conversion
159 // causes rounding off errors. Therefore use the default page size values
161 page_css_params.page_size = page_params.page_size;
164 page_css_params.margin_top =
165 ConvertUnit(margin_top_in_pixels, kPixelsPerInch, dpi);
166 page_css_params.margin_left =
167 ConvertUnit(margin_left_in_pixels, kPixelsPerInch, dpi);
168 return page_css_params;
171 double FitPrintParamsToPage(const PrintMsg_Print_Params& page_params,
172 PrintMsg_Print_Params* params_to_fit) {
173 double content_width =
174 static_cast<double>(params_to_fit->content_size.width());
175 double content_height =
176 static_cast<double>(params_to_fit->content_size.height());
177 int default_page_size_height = page_params.page_size.height();
178 int default_page_size_width = page_params.page_size.width();
179 int css_page_size_height = params_to_fit->page_size.height();
180 int css_page_size_width = params_to_fit->page_size.width();
182 double scale_factor = 1.0f;
183 if (page_params.page_size == params_to_fit->page_size)
186 if (default_page_size_width < css_page_size_width ||
187 default_page_size_height < css_page_size_height) {
189 static_cast<double>(default_page_size_width) / css_page_size_width;
190 double ratio_height =
191 static_cast<double>(default_page_size_height) / css_page_size_height;
192 scale_factor = ratio_width < ratio_height ? ratio_width : ratio_height;
193 content_width *= scale_factor;
194 content_height *= scale_factor;
196 params_to_fit->margin_top = static_cast<int>(
197 (default_page_size_height - css_page_size_height * scale_factor) / 2 +
198 (params_to_fit->margin_top * scale_factor));
199 params_to_fit->margin_left = static_cast<int>(
200 (default_page_size_width - css_page_size_width * scale_factor) / 2 +
201 (params_to_fit->margin_left * scale_factor));
202 params_to_fit->content_size = gfx::Size(
203 static_cast<int>(content_width), static_cast<int>(content_height));
204 params_to_fit->page_size = page_params.page_size;
208 void CalculatePageLayoutFromPrintParams(
209 const PrintMsg_Print_Params& params,
210 PageSizeMargins* page_layout_in_points) {
211 int dpi = GetDPI(¶ms);
212 int content_width = params.content_size.width();
213 int content_height = params.content_size.height();
215 int margin_bottom = params.page_size.height() -
216 content_height - params.margin_top;
217 int margin_right = params.page_size.width() -
218 content_width - params.margin_left;
220 page_layout_in_points->content_width =
221 ConvertUnit(content_width, dpi, kPointsPerInch);
222 page_layout_in_points->content_height =
223 ConvertUnit(content_height, dpi, kPointsPerInch);
224 page_layout_in_points->margin_top =
225 ConvertUnit(params.margin_top, dpi, kPointsPerInch);
226 page_layout_in_points->margin_right =
227 ConvertUnit(margin_right, dpi, kPointsPerInch);
228 page_layout_in_points->margin_bottom =
229 ConvertUnit(margin_bottom, dpi, kPointsPerInch);
230 page_layout_in_points->margin_left =
231 ConvertUnit(params.margin_left, dpi, kPointsPerInch);
234 void EnsureOrientationMatches(const PrintMsg_Print_Params& css_params,
235 PrintMsg_Print_Params* page_params) {
236 if ((page_params->page_size.width() > page_params->page_size.height()) ==
237 (css_params.page_size.width() > css_params.page_size.height())) {
241 // Swap the |width| and |height| values.
242 page_params->page_size.SetSize(page_params->page_size.height(),
243 page_params->page_size.width());
244 page_params->content_size.SetSize(page_params->content_size.height(),
245 page_params->content_size.width());
246 page_params->printable_area.set_size(
247 gfx::Size(page_params->printable_area.height(),
248 page_params->printable_area.width()));
251 void ComputeWebKitPrintParamsInDesiredDpi(
252 const PrintMsg_Print_Params& print_params,
253 blink::WebPrintParams* webkit_print_params) {
254 int dpi = GetDPI(&print_params);
255 webkit_print_params->printerDPI = dpi;
256 webkit_print_params->printScalingOption = print_params.print_scaling_option;
258 webkit_print_params->printContentArea.width =
259 ConvertUnit(print_params.content_size.width(), dpi,
260 print_params.desired_dpi);
261 webkit_print_params->printContentArea.height =
262 ConvertUnit(print_params.content_size.height(), dpi,
263 print_params.desired_dpi);
265 webkit_print_params->printableArea.x =
266 ConvertUnit(print_params.printable_area.x(), dpi,
267 print_params.desired_dpi);
268 webkit_print_params->printableArea.y =
269 ConvertUnit(print_params.printable_area.y(), dpi,
270 print_params.desired_dpi);
271 webkit_print_params->printableArea.width =
272 ConvertUnit(print_params.printable_area.width(), dpi,
273 print_params.desired_dpi);
274 webkit_print_params->printableArea.height =
275 ConvertUnit(print_params.printable_area.height(),
276 dpi, print_params.desired_dpi);
278 webkit_print_params->paperSize.width =
279 ConvertUnit(print_params.page_size.width(), dpi,
280 print_params.desired_dpi);
281 webkit_print_params->paperSize.height =
282 ConvertUnit(print_params.page_size.height(), dpi,
283 print_params.desired_dpi);
286 blink::WebPlugin* GetPlugin(const blink::WebFrame* frame) {
287 return frame->document().isPluginDocument() ?
288 frame->document().to<blink::WebPluginDocument>().plugin() : NULL;
291 bool PrintingNodeOrPdfFrame(const blink::WebFrame* frame,
292 const blink::WebNode& node) {
295 blink::WebPlugin* plugin = GetPlugin(frame);
296 return plugin && plugin->supportsPaginatedPrint();
299 bool PrintingFrameHasPageSizeStyle(blink::WebFrame* frame,
300 int total_page_count) {
303 bool frame_has_custom_page_size_style = false;
304 for (int i = 0; i < total_page_count; ++i) {
305 if (frame->hasCustomPageSizeStyle(i)) {
306 frame_has_custom_page_size_style = true;
310 return frame_has_custom_page_size_style;
313 MarginType GetMarginsForPdf(blink::WebFrame* frame,
314 const blink::WebNode& node) {
315 if (frame->isPrintScalingDisabledForPlugin(node))
318 return PRINTABLE_AREA_MARGINS;
321 bool FitToPageEnabled(const base::DictionaryValue& job_settings) {
322 bool fit_to_paper_size = false;
323 if (!job_settings.GetBoolean(kSettingFitToPageEnabled, &fit_to_paper_size)) {
326 return fit_to_paper_size;
329 PrintMsg_Print_Params CalculatePrintParamsForCss(
330 blink::WebFrame* frame,
332 const PrintMsg_Print_Params& page_params,
333 bool ignore_css_margins,
335 double* scale_factor) {
336 PrintMsg_Print_Params css_params = GetCssPrintParams(frame, page_index,
339 PrintMsg_Print_Params params = page_params;
340 EnsureOrientationMatches(css_params, ¶ms);
342 if (ignore_css_margins && fit_to_page)
345 PrintMsg_Print_Params result_params = css_params;
346 if (ignore_css_margins) {
347 result_params.margin_top = params.margin_top;
348 result_params.margin_left = params.margin_left;
350 DCHECK(!fit_to_page);
351 // Since we are ignoring the margins, the css page size is no longer
353 int default_margin_right = params.page_size.width() -
354 params.content_size.width() - params.margin_left;
355 int default_margin_bottom = params.page_size.height() -
356 params.content_size.height() - params.margin_top;
357 result_params.content_size = gfx::Size(
358 result_params.page_size.width() - result_params.margin_left -
359 default_margin_right,
360 result_params.page_size.height() - result_params.margin_top -
361 default_margin_bottom);
365 double factor = FitPrintParamsToPage(params, &result_params);
367 *scale_factor = factor;
369 return result_params;
372 bool IsPrintPreviewEnabled() {
376 bool IsPrintThrottlingDisabled() {
382 FrameReference::FrameReference(const blink::WebFrame* frame) {
386 FrameReference::FrameReference() {
390 FrameReference::~FrameReference() {
393 void FrameReference::Reset(const blink::WebFrame* frame) {
395 view_ = frame->view();
396 frame_name_ = frame->uniqueName();
403 blink::WebFrame* FrameReference::GetFrame() {
404 return view_ ? view_->findFrameByName(frame_name_) : NULL;
407 blink::WebView* FrameReference::view() {
411 // static - Not anonymous so that platform implementations can use it.
412 void PrintWebViewHelper::PrintHeaderAndFooter(
413 blink::WebCanvas* canvas,
416 float webkit_scale_factor,
417 const PageSizeMargins& page_layout,
418 const base::DictionaryValue& header_footer_info,
419 const PrintMsg_Print_Params& params) {
421 // TODO(sgurun) android_webview hack
422 skia::VectorPlatformDeviceSkia* device =
423 static_cast<skia::VectorPlatformDeviceSkia*>(canvas->getTopDevice());
424 device->setDrawingArea(SkPDFDevice::kMargin_DrawingArea);
426 SkAutoCanvasRestore auto_restore(canvas, true);
427 canvas->scale(1 / webkit_scale_factor, 1 / webkit_scale_factor);
429 blink::WebSize page_size(page_layout.margin_left + page_layout.margin_right +
430 page_layout.content_width,
431 page_layout.margin_top + page_layout.margin_bottom +
432 page_layout.content_height);
434 blink::WebView* web_view = blink::WebView::create(NULL);
435 web_view->settings()->setJavaScriptEnabled(true);
436 blink::WebFrame* frame = blink::WebFrame::create(NULL)
437 web_view->setMainFrame(web_frame);
439 base::StringValue html(
440 ResourceBundle::GetSharedInstance().GetLocalizedString(
441 IDR_PRINT_PREVIEW_PAGE));
442 // Load page with script to avoid async operations.
443 ExecuteScript(frame, kPageLoadScriptFormat, html);
445 scoped_ptr<base::DictionaryValue> options(header_footer_info.DeepCopy());
446 options->SetDouble("width", page_size.width);
447 options->SetDouble("height", page_size.height);
448 options->SetDouble("topMargin", page_layout.margin_top);
449 options->SetDouble("bottomMargin", page_layout.margin_bottom);
450 options->SetString("pageNumber",
451 base::StringPrintf("%d/%d", page_number, total_pages));
453 ExecuteScript(frame, kPageSetupScriptFormat, *options);
455 blink::WebPrintParams webkit_params(page_size);
456 webkit_params.printerDPI = GetDPI(¶ms);
458 frame->printBegin(webkit_params, WebKit::WebNode(), NULL);
459 frame->printPage(0, canvas);
465 device->setDrawingArea(SkPDFDevice::kContent_DrawingArea);
469 // static - Not anonymous so that platform implementations can use it.
470 float PrintWebViewHelper::RenderPageContent(blink::WebFrame* frame,
472 const gfx::Rect& canvas_area,
473 const gfx::Rect& content_area,
475 blink::WebCanvas* canvas) {
476 SkAutoCanvasRestore auto_restore(canvas, true);
477 if (content_area != canvas_area) {
478 canvas->translate((content_area.x() - canvas_area.x()) / scale_factor,
479 (content_area.y() - canvas_area.y()) / scale_factor);
481 SkRect::MakeXYWH(content_area.origin().x() / scale_factor,
482 content_area.origin().y() / scale_factor,
483 content_area.size().width() / scale_factor,
484 content_area.size().height() / scale_factor));
485 SkIRect clip_int_rect;
486 clip_rect.roundOut(&clip_int_rect);
487 SkRegion clip_region(clip_int_rect);
488 canvas->setClipRegion(clip_region);
490 return frame->printPage(page_number, canvas);
493 // Class that calls the Begin and End print functions on the frame and changes
494 // the size of the view temporarily to support full page printing..
495 class PrepareFrameAndViewForPrint : public blink::WebViewClient,
496 public blink::WebFrameClient {
498 PrepareFrameAndViewForPrint(const PrintMsg_Print_Params& params,
499 blink::WebFrame* frame,
500 const blink::WebNode& node,
501 bool ignore_css_margins);
502 virtual ~PrepareFrameAndViewForPrint();
504 // Optional. Replaces |frame_| with selection if needed. Will call |on_ready|
506 void CopySelectionIfNeeded(const WebPreferences& preferences,
507 const base::Closure& on_ready);
509 // Prepares frame for printing.
510 void StartPrinting();
512 blink::WebFrame* frame() {
513 return frame_.GetFrame();
516 const blink::WebNode& node() const {
517 return node_to_print_;
520 int GetExpectedPageCount() const {
521 return expected_pages_count_;
524 gfx::Size GetPrintCanvasSize() const;
526 void FinishPrinting();
528 bool IsLoadingSelection() {
529 // It's not selection if not |owns_web_view_|.
530 return owns_web_view_ && frame() && frame()->isLoading();
534 // blink::WebViewClient override:
535 virtual void didStopLoading();
537 // blink::WebFrameClient override:
538 virtual blink::WebFrame* createChildFrame(blink::WebFrame* parent,
539 const blink::WebString& name);
540 virtual void frameDetached(blink::WebFrame* frame);
544 void ResizeForPrinting();
546 void CopySelection(const WebPreferences& preferences);
548 base::WeakPtrFactory<PrepareFrameAndViewForPrint> weak_ptr_factory_;
550 FrameReference frame_;
551 blink::WebNode node_to_print_;
553 blink::WebPrintParams web_print_params_;
554 gfx::Size prev_view_size_;
555 gfx::Size prev_scroll_offset_;
556 int expected_pages_count_;
557 base::Closure on_ready_;
558 bool should_print_backgrounds_;
559 bool should_print_selection_only_;
560 bool is_printing_started_;
562 DISALLOW_COPY_AND_ASSIGN(PrepareFrameAndViewForPrint);
565 PrepareFrameAndViewForPrint::PrepareFrameAndViewForPrint(
566 const PrintMsg_Print_Params& params,
567 blink::WebFrame* frame,
568 const blink::WebNode& node,
569 bool ignore_css_margins)
570 : weak_ptr_factory_(this),
572 node_to_print_(node),
573 owns_web_view_(false),
574 expected_pages_count_(0),
575 should_print_backgrounds_(params.should_print_backgrounds),
576 should_print_selection_only_(params.selection_only),
577 is_printing_started_(false) {
578 PrintMsg_Print_Params print_params = params;
579 if (!should_print_selection_only_ ||
580 !PrintingNodeOrPdfFrame(frame, node_to_print_)) {
581 bool fit_to_page = ignore_css_margins &&
582 print_params.print_scaling_option ==
583 blink::WebPrintScalingOptionFitToPrintableArea;
584 ComputeWebKitPrintParamsInDesiredDpi(params, &web_print_params_);
585 frame->printBegin(web_print_params_, node_to_print_);
586 print_params = CalculatePrintParamsForCss(frame, 0, print_params,
587 ignore_css_margins, fit_to_page,
591 ComputeWebKitPrintParamsInDesiredDpi(print_params, &web_print_params_);
594 PrepareFrameAndViewForPrint::~PrepareFrameAndViewForPrint() {
598 void PrepareFrameAndViewForPrint::ResizeForPrinting() {
599 // Layout page according to printer page size. Since WebKit shrinks the
600 // size of the page automatically (from 125% to 200%) we trick it to
601 // think the page is 125% larger so the size of the page is correct for
602 // minimum (default) scaling.
603 // This is important for sites that try to fill the page.
604 gfx::Size print_layout_size(web_print_params_.printContentArea.width,
605 web_print_params_.printContentArea.height);
606 print_layout_size.set_height(
607 static_cast<int>(static_cast<double>(print_layout_size.height()) * 1.25));
611 blink::WebView* web_view = frame_.view();
612 // Backup size and offset.
613 if (blink::WebFrame* web_frame = web_view->mainFrame())
614 prev_scroll_offset_ = web_frame->scrollOffset();
615 prev_view_size_ = web_view->size();
617 web_view->resize(print_layout_size);
621 void PrepareFrameAndViewForPrint::StartPrinting() {
623 blink::WebView* web_view = frame_.view();
624 web_view->settings()->setShouldPrintBackgrounds(should_print_backgrounds_);
625 expected_pages_count_ =
626 frame()->printBegin(web_print_params_, node_to_print_);
627 is_printing_started_ = true;
630 void PrepareFrameAndViewForPrint::CopySelectionIfNeeded(
631 const WebPreferences& preferences,
632 const base::Closure& on_ready) {
633 on_ready_ = on_ready;
634 if (should_print_selection_only_)
635 CopySelection(preferences);
640 void PrepareFrameAndViewForPrint::CopySelection(
641 const WebPreferences& preferences) {
643 std::string url_str = "data:text/html;charset=utf-8,";
645 net::EscapeQueryParamValue(frame()->selectionAsMarkup().utf8(), false));
647 // Create a new WebView with the same settings as the current display one.
648 // Except that we disable javascript (don't want any active content running
650 WebPreferences prefs = preferences;
651 prefs.javascript_enabled = false;
652 prefs.java_enabled = false;
654 blink::WebView* web_view = blink::WebView::create(this);
655 owns_web_view_ = true;
656 content::ApplyWebPreferences(prefs, web_view);
657 web_view->setMainFrame(blink::WebFrame::create(this));
658 frame_.Reset(web_view->mainFrame());
659 node_to_print_.reset();
661 // When loading is done this will call didStopLoading() and that will do the
663 frame()->loadRequest(blink::WebURLRequest(GURL(url_str)));
666 void PrepareFrameAndViewForPrint::didStopLoading() {
667 DCHECK(!on_ready_.is_null());
668 // Don't call callback here, because it can delete |this| and WebView that is
669 // called didStopLoading.
670 base::MessageLoop::current()->PostTask(
672 base::Bind(&PrepareFrameAndViewForPrint::CallOnReady,
673 weak_ptr_factory_.GetWeakPtr()));
676 blink::WebFrame* PrepareFrameAndViewForPrint::createChildFrame(
677 blink::WebFrame* parent,
678 const blink::WebString& name) {
679 return blink::WebFrame::create(this);
682 void PrepareFrameAndViewForPrint::frameDetached(blink::WebFrame* frame) {
686 void PrepareFrameAndViewForPrint::CallOnReady() {
687 return on_ready_.Run(); // Can delete |this|.
690 gfx::Size PrepareFrameAndViewForPrint::GetPrintCanvasSize() const {
691 DCHECK(is_printing_started_);
692 return gfx::Size(web_print_params_.printContentArea.width,
693 web_print_params_.printContentArea.height);
696 void PrepareFrameAndViewForPrint::RestoreSize() {
698 blink::WebView* web_view = frame_.GetFrame()->view();
699 web_view->resize(prev_view_size_);
700 if (blink::WebFrame* web_frame = web_view->mainFrame())
701 web_frame->setScrollOffset(prev_scroll_offset_);
705 void PrepareFrameAndViewForPrint::FinishPrinting() {
706 blink::WebFrame* frame = frame_.GetFrame();
708 blink::WebView* web_view = frame->view();
709 if (is_printing_started_) {
710 is_printing_started_ = false;
712 if (!owns_web_view_) {
713 web_view->settings()->setShouldPrintBackgrounds(false);
717 if (owns_web_view_) {
718 DCHECK(!frame->isLoading());
719 owns_web_view_ = false;
727 PrintWebViewHelper::PrintWebViewHelper(content::RenderView* render_view)
728 : content::RenderViewObserver(render_view),
729 content::RenderViewObserverTracker<PrintWebViewHelper>(render_view),
730 reset_prep_frame_view_(false),
731 is_preview_enabled_(IsPrintPreviewEnabled()),
732 is_scripted_print_throttling_disabled_(IsPrintThrottlingDisabled()),
733 is_print_ready_metafile_sent_(false),
734 ignore_css_margins_(false),
735 user_cancelled_scripted_print_count_(0),
736 is_scripted_printing_blocked_(false),
737 notify_browser_of_print_failure_(true),
738 print_for_preview_(false),
739 print_node_in_progress_(false),
741 is_scripted_preview_delayed_(false),
742 weak_ptr_factory_(this) {
743 // TODO(sgurun) enable window.print() for webview crbug.com/322303
744 SetScriptedPrintBlocked(true);
747 PrintWebViewHelper::~PrintWebViewHelper() {}
749 bool PrintWebViewHelper::IsScriptInitiatedPrintAllowed(
750 blink::WebFrame* frame, bool user_initiated) {
751 #if defined(OS_ANDROID)
753 #endif // defined(OS_ANDROID)
754 if (is_scripted_printing_blocked_)
756 // If preview is enabled, then the print dialog is tab modal, and the user
757 // can always close the tab on a mis-behaving page (the system print dialog
758 // is app modal). If the print was initiated through user action, don't
759 // throttle. Or, if the command line flag to skip throttling has been set.
760 if (!is_scripted_print_throttling_disabled_ &&
761 !is_preview_enabled_ &&
763 return !IsScriptInitiatedPrintTooFrequent(frame);
767 void PrintWebViewHelper::DidStartLoading() {
771 void PrintWebViewHelper::DidStopLoading() {
773 ShowScriptedPrintPreview();
776 // Prints |frame| which called window.print().
777 void PrintWebViewHelper::PrintPage(blink::WebFrame* frame,
778 bool user_initiated) {
781 #if !defined(OS_ANDROID)
782 // TODO(sgurun) android_webview hack
783 // Allow Prerendering to cancel this print request if necessary.
784 if (prerender::PrerenderHelper::IsPrerendering(render_view())) {
785 Send(new ChromeViewHostMsg_CancelPrerenderForPrinting(routing_id()));
788 #endif // !defined(OS_ANDROID)
790 if (!IsScriptInitiatedPrintAllowed(frame, user_initiated))
792 IncrementScriptedPrintCount();
794 if (is_preview_enabled_) {
795 print_preview_context_.InitWithFrame(frame);
796 RequestPrintPreview(PRINT_PREVIEW_SCRIPTED);
798 Print(frame, blink::WebNode());
802 bool PrintWebViewHelper::OnMessageReceived(const IPC::Message& message) {
804 IPC_BEGIN_MESSAGE_MAP(PrintWebViewHelper, message)
805 IPC_MESSAGE_HANDLER(PrintMsg_PrintPages, OnPrintPages)
806 IPC_MESSAGE_HANDLER(PrintMsg_PrintForSystemDialog, OnPrintForSystemDialog)
807 IPC_MESSAGE_HANDLER(PrintMsg_InitiatePrintPreview, OnInitiatePrintPreview)
808 IPC_MESSAGE_HANDLER(PrintMsg_PrintNodeUnderContextMenu,
809 OnPrintNodeUnderContextMenu)
810 IPC_MESSAGE_HANDLER(PrintMsg_PrintPreview, OnPrintPreview)
811 IPC_MESSAGE_HANDLER(PrintMsg_PrintForPrintPreview, OnPrintForPrintPreview)
812 IPC_MESSAGE_HANDLER(PrintMsg_PrintingDone, OnPrintingDone)
813 IPC_MESSAGE_HANDLER(PrintMsg_ResetScriptedPrintCount,
814 ResetScriptedPrintCount)
815 IPC_MESSAGE_HANDLER(PrintMsg_SetScriptedPrintingBlocked,
816 SetScriptedPrintBlocked)
817 IPC_MESSAGE_UNHANDLED(handled = false)
818 IPC_END_MESSAGE_MAP()
822 void PrintWebViewHelper::OnPrintForPrintPreview(
823 const base::DictionaryValue& job_settings) {
824 DCHECK(is_preview_enabled_);
825 // If still not finished with earlier print request simply ignore.
826 if (prep_frame_view_)
829 if (!render_view()->GetWebView())
831 blink::WebFrame* main_frame = render_view()->GetWebView()->mainFrame();
835 blink::WebDocument document = main_frame->document();
836 // <object> with id="pdf-viewer" is created in
837 // chrome/browser/resources/print_preview/print_preview.js
838 blink::WebElement pdf_element = document.getElementById("pdf-viewer");
839 if (pdf_element.isNull()) {
844 // Set |print_for_preview_| flag and autoreset it to back to original
846 base::AutoReset<bool> set_printing_flag(&print_for_preview_, true);
848 blink::WebFrame* pdf_frame = pdf_element.document().frame();
849 if (!UpdatePrintSettings(pdf_frame, pdf_element, job_settings)) {
850 LOG(ERROR) << "UpdatePrintSettings failed";
851 DidFinishPrinting(FAIL_PRINT);
855 // Print page onto entire page not just printable area. Preview PDF already
856 // has content in correct position taking into account page size and printable
858 // TODO(vitalybuka) : Make this consistent on all platform. This change
859 // affects Windows only. On Linux and OSX RenderPagesForPrint does not use
860 // printable_area. Also we can't change printable_area deeper inside
861 // RenderPagesForPrint for Windows, because it's used also by native
862 // printing and it expects real printable_area value.
863 // See http://crbug.com/123408
864 PrintMsg_Print_Params& print_params = print_pages_params_->params;
865 print_params.printable_area = gfx::Rect(print_params.page_size);
867 // Render Pages for printing.
868 if (!RenderPagesForPrint(pdf_frame, pdf_element)) {
869 LOG(ERROR) << "RenderPagesForPrint failed";
870 DidFinishPrinting(FAIL_PRINT);
874 bool PrintWebViewHelper::GetPrintFrame(blink::WebFrame** frame) {
876 blink::WebView* webView = render_view()->GetWebView();
881 // If the user has selected text in the currently focused frame we print
882 // only that frame (this makes print selection work for multiple frames).
883 blink::WebFrame* focusedFrame = webView->focusedFrame();
884 *frame = focusedFrame->hasSelection() ? focusedFrame : webView->mainFrame();
888 void PrintWebViewHelper::OnPrintPages() {
889 blink::WebFrame* frame;
890 if (GetPrintFrame(&frame))
891 Print(frame, blink::WebNode());
894 void PrintWebViewHelper::OnPrintForSystemDialog() {
895 blink::WebFrame* frame = print_preview_context_.source_frame();
901 Print(frame, print_preview_context_.source_node());
904 void PrintWebViewHelper::GetPageSizeAndContentAreaFromPageLayout(
905 const PageSizeMargins& page_layout_in_points,
906 gfx::Size* page_size,
907 gfx::Rect* content_area) {
908 *page_size = gfx::Size(
909 page_layout_in_points.content_width +
910 page_layout_in_points.margin_right +
911 page_layout_in_points.margin_left,
912 page_layout_in_points.content_height +
913 page_layout_in_points.margin_top +
914 page_layout_in_points.margin_bottom);
915 *content_area = gfx::Rect(page_layout_in_points.margin_left,
916 page_layout_in_points.margin_top,
917 page_layout_in_points.content_width,
918 page_layout_in_points.content_height);
921 void PrintWebViewHelper::UpdateFrameMarginsCssInfo(
922 const base::DictionaryValue& settings) {
923 int margins_type = 0;
924 if (!settings.GetInteger(kSettingMarginsType, &margins_type))
925 margins_type = DEFAULT_MARGINS;
926 ignore_css_margins_ = (margins_type != DEFAULT_MARGINS);
929 bool PrintWebViewHelper::IsPrintToPdfRequested(
930 const base::DictionaryValue& job_settings) {
931 bool print_to_pdf = false;
932 if (!job_settings.GetBoolean(kSettingPrintToPDF, &print_to_pdf))
937 blink::WebPrintScalingOption PrintWebViewHelper::GetPrintScalingOption(
938 bool source_is_html, const base::DictionaryValue& job_settings,
939 const PrintMsg_Print_Params& params) {
940 DCHECK(!print_for_preview_);
942 if (params.print_to_pdf)
943 return blink::WebPrintScalingOptionSourceSize;
945 if (!source_is_html) {
946 if (!FitToPageEnabled(job_settings))
947 return blink::WebPrintScalingOptionNone;
949 bool no_plugin_scaling =
950 print_preview_context_.source_frame()->isPrintScalingDisabledForPlugin(
951 print_preview_context_.source_node());
953 if (params.is_first_request && no_plugin_scaling)
954 return blink::WebPrintScalingOptionNone;
956 return blink::WebPrintScalingOptionFitToPrintableArea;
959 void PrintWebViewHelper::OnPrintPreview(const base::DictionaryValue& settings) {
960 DCHECK(is_preview_enabled_);
961 print_preview_context_.OnPrintPreview();
963 UMA_HISTOGRAM_ENUMERATION("PrintPreview.PreviewEvent",
964 PREVIEW_EVENT_REQUESTED, PREVIEW_EVENT_MAX);
966 if (!UpdatePrintSettings(print_preview_context_.source_frame(),
967 print_preview_context_.source_node(), settings)) {
968 if (print_preview_context_.last_error() != PREVIEW_ERROR_BAD_SETTING) {
969 Send(new PrintHostMsg_PrintPreviewInvalidPrinterSettings(
970 routing_id(), print_pages_params_->params.document_cookie));
971 notify_browser_of_print_failure_ = false; // Already sent.
973 DidFinishPrinting(FAIL_PREVIEW);
977 // If we are previewing a pdf and the print scaling is disabled, send a
978 // message to browser.
979 if (print_pages_params_->params.is_first_request &&
980 !print_preview_context_.IsModifiable() &&
981 print_preview_context_.source_frame()->isPrintScalingDisabledForPlugin(
982 print_preview_context_.source_node())) {
983 Send(new PrintHostMsg_PrintPreviewScalingDisabled(routing_id()));
986 is_print_ready_metafile_sent_ = false;
988 // PDF printer device supports alpha blending.
989 print_pages_params_->params.supports_alpha_blend = true;
991 bool generate_draft_pages = false;
992 if (!settings.GetBoolean(kSettingGenerateDraftData,
993 &generate_draft_pages)) {
996 print_preview_context_.set_generate_draft_pages(generate_draft_pages);
998 PrepareFrameForPreviewDocument();
1001 void PrintWebViewHelper::PrepareFrameForPreviewDocument() {
1002 reset_prep_frame_view_ = false;
1004 if (!print_pages_params_ || CheckForCancel()) {
1005 DidFinishPrinting(FAIL_PREVIEW);
1009 // Don't reset loading frame or WebKit will fail assert. Just retry when
1010 // current selection is loaded.
1011 if (prep_frame_view_ && prep_frame_view_->IsLoadingSelection()) {
1012 reset_prep_frame_view_ = true;
1016 const PrintMsg_Print_Params& print_params = print_pages_params_->params;
1017 prep_frame_view_.reset(
1018 new PrepareFrameAndViewForPrint(print_params,
1019 print_preview_context_.source_frame(),
1020 print_preview_context_.source_node(),
1021 ignore_css_margins_));
1022 prep_frame_view_->CopySelectionIfNeeded(
1023 render_view()->GetWebkitPreferences(),
1024 base::Bind(&PrintWebViewHelper::OnFramePreparedForPreviewDocument,
1025 base::Unretained(this)));
1028 void PrintWebViewHelper::OnFramePreparedForPreviewDocument() {
1029 if (reset_prep_frame_view_) {
1030 PrepareFrameForPreviewDocument();
1033 DidFinishPrinting(CreatePreviewDocument() ? OK : FAIL_PREVIEW);
1036 bool PrintWebViewHelper::CreatePreviewDocument() {
1037 if (!print_pages_params_ || CheckForCancel())
1040 UMA_HISTOGRAM_ENUMERATION("PrintPreview.PreviewEvent",
1041 PREVIEW_EVENT_CREATE_DOCUMENT, PREVIEW_EVENT_MAX);
1043 const PrintMsg_Print_Params& print_params = print_pages_params_->params;
1044 const std::vector<int>& pages = print_pages_params_->pages;
1046 if (!print_preview_context_.CreatePreviewDocument(prep_frame_view_.release(),
1051 PageSizeMargins default_page_layout;
1052 ComputePageLayoutInPointsForCss(print_preview_context_.prepared_frame(), 0,
1053 print_params, ignore_css_margins_, NULL,
1054 &default_page_layout);
1056 bool has_page_size_style = PrintingFrameHasPageSizeStyle(
1057 print_preview_context_.prepared_frame(),
1058 print_preview_context_.total_page_count());
1059 int dpi = GetDPI(&print_params);
1061 gfx::Rect printable_area_in_points(
1062 ConvertUnit(print_params.printable_area.x(), dpi, kPointsPerInch),
1063 ConvertUnit(print_params.printable_area.y(), dpi, kPointsPerInch),
1064 ConvertUnit(print_params.printable_area.width(), dpi, kPointsPerInch),
1065 ConvertUnit(print_params.printable_area.height(), dpi, kPointsPerInch));
1067 // Margins: Send default page layout to browser process.
1068 Send(new PrintHostMsg_DidGetDefaultPageLayout(routing_id(),
1069 default_page_layout,
1070 printable_area_in_points,
1071 has_page_size_style));
1073 PrintHostMsg_DidGetPreviewPageCount_Params params;
1074 params.page_count = print_preview_context_.total_page_count();
1075 params.is_modifiable = print_preview_context_.IsModifiable();
1076 params.document_cookie = print_params.document_cookie;
1077 params.preview_request_id = print_params.preview_request_id;
1078 params.clear_preview_data = print_preview_context_.generate_draft_pages();
1079 Send(new PrintHostMsg_DidGetPreviewPageCount(routing_id(), params));
1080 if (CheckForCancel())
1083 while (!print_preview_context_.IsFinalPageRendered()) {
1084 int page_number = print_preview_context_.GetNextPageNumber();
1085 DCHECK_GE(page_number, 0);
1086 if (!RenderPreviewPage(page_number, print_params))
1089 if (CheckForCancel())
1092 // We must call PrepareFrameAndViewForPrint::FinishPrinting() (by way of
1093 // print_preview_context_.AllPagesRendered()) before calling
1094 // FinalizePrintReadyDocument() when printing a PDF because the plugin
1095 // code does not generate output until we call FinishPrinting(). We do not
1096 // generate draft pages for PDFs, so IsFinalPageRendered() and
1097 // IsLastPageOfPrintReadyMetafile() will be true in the same iteration of
1099 if (print_preview_context_.IsFinalPageRendered())
1100 print_preview_context_.AllPagesRendered();
1102 if (print_preview_context_.IsLastPageOfPrintReadyMetafile()) {
1103 DCHECK(print_preview_context_.IsModifiable() ||
1104 print_preview_context_.IsFinalPageRendered());
1105 if (!FinalizePrintReadyDocument())
1109 print_preview_context_.Finished();
1113 bool PrintWebViewHelper::FinalizePrintReadyDocument() {
1114 DCHECK(!is_print_ready_metafile_sent_);
1115 print_preview_context_.FinalizePrintReadyDocument();
1117 // Get the size of the resulting metafile.
1118 PreviewMetafile* metafile = print_preview_context_.metafile();
1119 uint32 buf_size = metafile->GetDataSize();
1120 DCHECK_GT(buf_size, 0u);
1122 PrintHostMsg_DidPreviewDocument_Params preview_params;
1123 preview_params.reuse_existing_data = false;
1124 preview_params.data_size = buf_size;
1125 preview_params.document_cookie = print_pages_params_->params.document_cookie;
1126 preview_params.expected_pages_count =
1127 print_preview_context_.total_page_count();
1128 preview_params.modifiable = print_preview_context_.IsModifiable();
1129 preview_params.preview_request_id =
1130 print_pages_params_->params.preview_request_id;
1132 // Ask the browser to create the shared memory for us.
1133 if (!CopyMetafileDataToSharedMem(metafile,
1134 &(preview_params.metafile_data_handle))) {
1135 LOG(ERROR) << "CopyMetafileDataToSharedMem failed";
1136 print_preview_context_.set_error(PREVIEW_ERROR_METAFILE_COPY_FAILED);
1139 is_print_ready_metafile_sent_ = true;
1141 Send(new PrintHostMsg_MetafileReadyForPrinting(routing_id(), preview_params));
1145 void PrintWebViewHelper::OnPrintingDone(bool success) {
1146 notify_browser_of_print_failure_ = false;
1148 LOG(ERROR) << "Failure in OnPrintingDone";
1149 DidFinishPrinting(success ? OK : FAIL_PRINT);
1152 void PrintWebViewHelper::SetScriptedPrintBlocked(bool blocked) {
1153 is_scripted_printing_blocked_ = blocked;
1156 void PrintWebViewHelper::OnPrintNodeUnderContextMenu() {
1157 PrintNode(render_view()->GetContextMenuNode());
1160 void PrintWebViewHelper::OnInitiatePrintPreview(bool selection_only) {
1161 DCHECK(is_preview_enabled_);
1162 blink::WebFrame* frame = NULL;
1163 GetPrintFrame(&frame);
1165 print_preview_context_.InitWithFrame(frame);
1166 RequestPrintPreview(selection_only ?
1167 PRINT_PREVIEW_USER_INITIATED_SELECTION :
1168 PRINT_PREVIEW_USER_INITIATED_ENTIRE_FRAME);
1171 bool PrintWebViewHelper::IsPrintingEnabled() {
1172 bool result = false;
1173 Send(new PrintHostMsg_IsPrintingEnabled(routing_id(), &result));
1177 void PrintWebViewHelper::PrintNode(const blink::WebNode& node) {
1178 if (node.isNull() || !node.document().frame()) {
1179 // This can occur when the context menu refers to an invalid WebNode.
1180 // See http://crbug.com/100890#c17 for a repro case.
1184 if (print_node_in_progress_) {
1185 // This can happen as a result of processing sync messages when printing
1186 // from ppapi plugins. It's a rare case, so its OK to just fail here.
1187 // See http://crbug.com/159165.
1191 print_node_in_progress_ = true;
1193 // Make a copy of the node, in case RenderView::OnContextMenuClosed resets
1194 // its |context_menu_node_|.
1195 if (is_preview_enabled_) {
1196 print_preview_context_.InitWithNode(node);
1197 RequestPrintPreview(PRINT_PREVIEW_USER_INITIATED_CONTEXT_NODE);
1199 blink::WebNode duplicate_node(node);
1200 Print(duplicate_node.document().frame(), duplicate_node);
1203 print_node_in_progress_ = false;
1206 void PrintWebViewHelper::Print(blink::WebFrame* frame,
1207 const blink::WebNode& node) {
1208 // If still not finished with earlier print request simply ignore.
1209 if (prep_frame_view_)
1212 FrameReference frame_ref(frame);
1214 int expected_page_count = 0;
1215 if (!CalculateNumberOfPages(frame, node, &expected_page_count)) {
1216 DidFinishPrinting(FAIL_PRINT_INIT);
1217 return; // Failed to init print page settings.
1220 // Some full screen plugins can say they don't want to print.
1221 if (!expected_page_count) {
1222 DidFinishPrinting(FAIL_PRINT);
1226 #if !defined(OS_ANDROID)
1227 // TODO(sgurun) android_webview hack
1228 // Ask the browser to show UI to retrieve the final print settings.
1229 if (!GetPrintSettingsFromUser(frame_ref.GetFrame(), node,
1230 expected_page_count)) {
1231 DidFinishPrinting(OK); // Release resources and fail silently.
1234 #endif // !defined(OS_ANDROID)
1236 // Render Pages for printing.
1237 if (!RenderPagesForPrint(frame_ref.GetFrame(), node)) {
1238 LOG(ERROR) << "RenderPagesForPrint failed";
1239 DidFinishPrinting(FAIL_PRINT);
1241 ResetScriptedPrintCount();
1244 void PrintWebViewHelper::DidFinishPrinting(PrintingResult result) {
1249 case FAIL_PRINT_INIT:
1250 DCHECK(!notify_browser_of_print_failure_);
1254 if (notify_browser_of_print_failure_ && print_pages_params_.get()) {
1255 int cookie = print_pages_params_->params.document_cookie;
1256 Send(new PrintHostMsg_PrintingFailed(routing_id(), cookie));
1261 DCHECK(is_preview_enabled_);
1262 int cookie = print_pages_params_.get() ?
1263 print_pages_params_->params.document_cookie : 0;
1264 if (notify_browser_of_print_failure_) {
1265 LOG(ERROR) << "CreatePreviewDocument failed";
1266 Send(new PrintHostMsg_PrintPreviewFailed(routing_id(), cookie));
1268 Send(new PrintHostMsg_PrintPreviewCancelled(routing_id(), cookie));
1270 print_preview_context_.Failed(notify_browser_of_print_failure_);
1274 prep_frame_view_.reset();
1275 print_pages_params_.reset();
1276 notify_browser_of_print_failure_ = true;
1279 void PrintWebViewHelper::OnFramePreparedForPrintPages() {
1281 FinishFramePrinting();
1284 void PrintWebViewHelper::PrintPages() {
1285 if (!prep_frame_view_) // Printing is already canceled or failed.
1287 prep_frame_view_->StartPrinting();
1289 int page_count = prep_frame_view_->GetExpectedPageCount();
1291 LOG(ERROR) << "Can't print 0 pages.";
1292 return DidFinishPrinting(FAIL_PRINT);
1295 const PrintMsg_PrintPages_Params& params = *print_pages_params_;
1296 const PrintMsg_Print_Params& print_params = params.params;
1298 #if !defined(OS_CHROMEOS) && !defined(OS_ANDROID)
1299 // TODO(vitalybuka): should be page_count or valid pages from params.pages.
1300 // See http://crbug.com/161576
1301 Send(new PrintHostMsg_DidGetPrintedPagesCount(routing_id(),
1302 print_params.document_cookie,
1304 #endif // !defined(OS_CHROMEOS)
1306 if (print_params.preview_ui_id < 0) {
1307 // Printing for system dialog.
1308 int printed_count = params.pages.empty() ? page_count : params.pages.size();
1309 #if !defined(OS_CHROMEOS)
1310 UMA_HISTOGRAM_COUNTS("PrintPreview.PageCount.SystemDialog", printed_count);
1312 UMA_HISTOGRAM_COUNTS("PrintPreview.PageCount.PrintToCloudPrintWebDialog",
1314 #endif // !defined(OS_CHROMEOS)
1318 if (!PrintPagesNative(prep_frame_view_->frame(), page_count,
1319 prep_frame_view_->GetPrintCanvasSize())) {
1320 LOG(ERROR) << "Printing failed.";
1321 return DidFinishPrinting(FAIL_PRINT);
1325 void PrintWebViewHelper::FinishFramePrinting() {
1326 prep_frame_view_.reset();
1329 #if defined(OS_MACOSX) || defined(OS_WIN)
1330 bool PrintWebViewHelper::PrintPagesNative(blink::WebFrame* frame,
1332 const gfx::Size& canvas_size) {
1333 const PrintMsg_PrintPages_Params& params = *print_pages_params_;
1334 const PrintMsg_Print_Params& print_params = params.params;
1336 PrintMsg_PrintPage_Params page_params;
1337 page_params.params = print_params;
1338 if (params.pages.empty()) {
1339 for (int i = 0; i < page_count; ++i) {
1340 page_params.page_number = i;
1341 PrintPageInternal(page_params, canvas_size, frame);
1344 for (size_t i = 0; i < params.pages.size(); ++i) {
1345 if (params.pages[i] >= page_count)
1347 page_params.page_number = params.pages[i];
1348 PrintPageInternal(page_params, canvas_size, frame);
1354 #endif // OS_MACOSX || OS_WIN
1356 // static - Not anonymous so that platform implementations can use it.
1357 void PrintWebViewHelper::ComputePageLayoutInPointsForCss(
1358 blink::WebFrame* frame,
1360 const PrintMsg_Print_Params& page_params,
1361 bool ignore_css_margins,
1362 double* scale_factor,
1363 PageSizeMargins* page_layout_in_points) {
1364 PrintMsg_Print_Params params = CalculatePrintParamsForCss(
1365 frame, page_index, page_params, ignore_css_margins,
1366 page_params.print_scaling_option ==
1367 blink::WebPrintScalingOptionFitToPrintableArea,
1369 CalculatePageLayoutFromPrintParams(params, page_layout_in_points);
1372 bool PrintWebViewHelper::InitPrintSettings(bool fit_to_paper_size) {
1373 PrintMsg_PrintPages_Params settings;
1374 Send(new PrintHostMsg_GetDefaultPrintSettings(routing_id(),
1376 // Check if the printer returned any settings, if the settings is empty, we
1377 // can safely assume there are no printer drivers configured. So we safely
1380 if (!PrintMsg_Print_Params_IsValid(settings.params))
1384 (settings.params.dpi < kMinDpi || settings.params.document_cookie == 0)) {
1385 // Invalid print page settings.
1390 // Reset to default values.
1391 ignore_css_margins_ = false;
1392 settings.pages.clear();
1394 settings.params.print_scaling_option =
1395 blink::WebPrintScalingOptionSourceSize;
1396 if (fit_to_paper_size) {
1397 settings.params.print_scaling_option =
1398 blink::WebPrintScalingOptionFitToPrintableArea;
1401 print_pages_params_.reset(new PrintMsg_PrintPages_Params(settings));
1405 bool PrintWebViewHelper::CalculateNumberOfPages(blink::WebFrame* frame,
1406 const blink::WebNode& node,
1407 int* number_of_pages) {
1409 bool fit_to_paper_size = !(PrintingNodeOrPdfFrame(frame, node));
1410 if (!InitPrintSettings(fit_to_paper_size)) {
1411 notify_browser_of_print_failure_ = false;
1412 #if !defined(OS_ANDROID)
1413 // TODO(sgurun) android_webview hack
1414 render_view()->RunModalAlertDialog(
1416 l10n_util::GetStringUTF16(IDS_PRINT_INVALID_PRINTER_SETTINGS));
1417 #endif // !defined(OS_ANDROID)
1421 const PrintMsg_Print_Params& params = print_pages_params_->params;
1422 PrepareFrameAndViewForPrint prepare(params, frame, node, ignore_css_margins_);
1423 prepare.StartPrinting();
1425 Send(new PrintHostMsg_DidGetDocumentCookie(routing_id(),
1426 params.document_cookie));
1427 *number_of_pages = prepare.GetExpectedPageCount();
1431 bool PrintWebViewHelper::UpdatePrintSettings(
1432 blink::WebFrame* frame,
1433 const blink::WebNode& node,
1434 const base::DictionaryValue& passed_job_settings) {
1435 DCHECK(is_preview_enabled_);
1436 const base::DictionaryValue* job_settings = &passed_job_settings;
1437 base::DictionaryValue modified_job_settings;
1438 if (job_settings->empty()) {
1439 if (!print_for_preview_)
1440 print_preview_context_.set_error(PREVIEW_ERROR_BAD_SETTING);
1444 bool source_is_html = true;
1445 if (print_for_preview_) {
1446 if (!job_settings->GetBoolean(kSettingPreviewModifiable, &source_is_html)) {
1450 source_is_html = !PrintingNodeOrPdfFrame(frame, node);
1453 if (print_for_preview_ || !source_is_html) {
1454 modified_job_settings.MergeDictionary(job_settings);
1455 modified_job_settings.SetBoolean(kSettingHeaderFooterEnabled, false);
1456 modified_job_settings.SetInteger(kSettingMarginsType, NO_MARGINS);
1457 job_settings = &modified_job_settings;
1460 // Send the cookie so that UpdatePrintSettings can reuse PrinterQuery when
1462 int cookie = print_pages_params_.get() ?
1463 print_pages_params_->params.document_cookie : 0;
1464 PrintMsg_PrintPages_Params settings;
1465 Send(new PrintHostMsg_UpdatePrintSettings(routing_id(), cookie, *job_settings,
1467 print_pages_params_.reset(new PrintMsg_PrintPages_Params(settings));
1469 if (!PrintMsg_Print_Params_IsValid(settings.params)) {
1470 if (!print_for_preview_) {
1471 print_preview_context_.set_error(PREVIEW_ERROR_INVALID_PRINTER_SETTINGS);
1473 #if !defined(OS_ANDROID)
1474 // TODO(sgurun) android_webview hack
1475 // PrintForPrintPreview
1476 blink::WebFrame* print_frame = NULL;
1477 // This may not be the right frame, but the alert will be modal,
1478 // therefore it works well enough.
1479 GetPrintFrame(&print_frame);
1481 render_view()->RunModalAlertDialog(
1483 l10n_util::GetStringUTF16(
1484 IDS_PRINT_INVALID_PRINTER_SETTINGS));
1486 #endif // !defined(OS_ANDROID)
1491 if (settings.params.dpi < kMinDpi || !settings.params.document_cookie) {
1492 print_preview_context_.set_error(PREVIEW_ERROR_UPDATING_PRINT_SETTINGS);
1496 if (!job_settings->GetInteger(kPreviewUIID, &settings.params.preview_ui_id)) {
1498 print_preview_context_.set_error(PREVIEW_ERROR_BAD_SETTING);
1502 if (!print_for_preview_) {
1503 // Validate expected print preview settings.
1504 if (!job_settings->GetInteger(kPreviewRequestID,
1505 &settings.params.preview_request_id) ||
1506 !job_settings->GetBoolean(kIsFirstRequest,
1507 &settings.params.is_first_request)) {
1509 print_preview_context_.set_error(PREVIEW_ERROR_BAD_SETTING);
1513 settings.params.print_to_pdf = IsPrintToPdfRequested(*job_settings);
1514 UpdateFrameMarginsCssInfo(*job_settings);
1515 settings.params.print_scaling_option = GetPrintScalingOption(
1516 source_is_html, *job_settings, settings.params);
1518 // Header/Footer: Set |header_footer_info_|.
1519 if (settings.params.display_header_footer) {
1520 header_footer_info_.reset(new base::DictionaryValue());
1521 header_footer_info_->SetDouble(kSettingHeaderFooterDate,
1522 base::Time::Now().ToJsTime());
1523 header_footer_info_->SetString(kSettingHeaderFooterURL,
1524 settings.params.url);
1525 header_footer_info_->SetString(kSettingHeaderFooterTitle,
1526 settings.params.title);
1530 print_pages_params_.reset(new PrintMsg_PrintPages_Params(settings));
1531 Send(new PrintHostMsg_DidGetDocumentCookie(routing_id(),
1532 settings.params.document_cookie));
1537 bool PrintWebViewHelper::GetPrintSettingsFromUser(blink::WebFrame* frame,
1538 const blink::WebNode& node,
1539 int expected_pages_count) {
1540 PrintHostMsg_ScriptedPrint_Params params;
1541 PrintMsg_PrintPages_Params print_settings;
1543 params.cookie = print_pages_params_->params.document_cookie;
1544 params.has_selection = frame->hasSelection();
1545 params.expected_pages_count = expected_pages_count;
1546 MarginType margin_type = DEFAULT_MARGINS;
1547 if (PrintingNodeOrPdfFrame(frame, node))
1548 margin_type = GetMarginsForPdf(frame, node);
1549 params.margin_type = margin_type;
1551 Send(new PrintHostMsg_DidShowPrintDialog(routing_id()));
1553 // PrintHostMsg_ScriptedPrint will reset print_scaling_option, so we save the
1554 // value before and restore it afterwards.
1555 blink::WebPrintScalingOption scaling_option =
1556 print_pages_params_->params.print_scaling_option;
1558 print_pages_params_.reset();
1559 IPC::SyncMessage* msg =
1560 new PrintHostMsg_ScriptedPrint(routing_id(), params, &print_settings);
1561 msg->EnableMessagePumping();
1563 print_pages_params_.reset(new PrintMsg_PrintPages_Params(print_settings));
1565 print_pages_params_->params.print_scaling_option = scaling_option;
1566 return (print_settings.params.dpi && print_settings.params.document_cookie);
1569 bool PrintWebViewHelper::RenderPagesForPrint(blink::WebFrame* frame,
1570 const blink::WebNode& node) {
1571 if (!frame || prep_frame_view_)
1573 const PrintMsg_PrintPages_Params& params = *print_pages_params_;
1574 const PrintMsg_Print_Params& print_params = params.params;
1575 prep_frame_view_.reset(
1576 new PrepareFrameAndViewForPrint(print_params, frame, node,
1577 ignore_css_margins_));
1578 DCHECK(!print_pages_params_->params.selection_only ||
1579 print_pages_params_->pages.empty());
1580 prep_frame_view_->CopySelectionIfNeeded(
1581 render_view()->GetWebkitPreferences(),
1582 base::Bind(&PrintWebViewHelper::OnFramePreparedForPrintPages,
1583 base::Unretained(this)));
1587 #if defined(OS_POSIX)
1588 bool PrintWebViewHelper::CopyMetafileDataToSharedMem(
1590 base::SharedMemoryHandle* shared_mem_handle) {
1591 uint32 buf_size = metafile->GetDataSize();
1592 scoped_ptr<base::SharedMemory> shared_buf(
1593 content::RenderThread::Get()->HostAllocateSharedMemoryBuffer(
1594 buf_size).release());
1596 if (shared_buf.get()) {
1597 if (shared_buf->Map(buf_size)) {
1598 metafile->GetData(shared_buf->memory(), buf_size);
1599 shared_buf->GiveToProcess(base::GetCurrentProcessHandle(),
1607 #endif // defined(OS_POSIX)
1609 bool PrintWebViewHelper::IsScriptInitiatedPrintTooFrequent(
1610 blink::WebFrame* frame) {
1611 const int kMinSecondsToIgnoreJavascriptInitiatedPrint = 2;
1612 const int kMaxSecondsToIgnoreJavascriptInitiatedPrint = 32;
1613 bool too_frequent = false;
1615 // Check if there is script repeatedly trying to print and ignore it if too
1616 // frequent. The first 3 times, we use a constant wait time, but if this
1617 // gets excessive, we switch to exponential wait time. So for a page that
1618 // calls print() in a loop the user will need to cancel the print dialog
1619 // after: [2, 2, 2, 4, 8, 16, 32, 32, ...] seconds.
1620 // This gives the user time to navigate from the page.
1621 if (user_cancelled_scripted_print_count_ > 0) {
1622 base::TimeDelta diff = base::Time::Now() - last_cancelled_script_print_;
1623 int min_wait_seconds = kMinSecondsToIgnoreJavascriptInitiatedPrint;
1624 if (user_cancelled_scripted_print_count_ > 3) {
1625 min_wait_seconds = std::min(
1626 kMinSecondsToIgnoreJavascriptInitiatedPrint <<
1627 (user_cancelled_scripted_print_count_ - 3),
1628 kMaxSecondsToIgnoreJavascriptInitiatedPrint);
1630 if (diff.InSeconds() < min_wait_seconds) {
1631 too_frequent = true;
1638 blink::WebString message(
1639 blink::WebString::fromUTF8("Ignoring too frequent calls to print()."));
1640 frame->addMessageToConsole(
1641 blink::WebConsoleMessage(
1642 blink::WebConsoleMessage::LevelWarning, message));
1646 void PrintWebViewHelper::ResetScriptedPrintCount() {
1647 // Reset cancel counter on successful print.
1648 user_cancelled_scripted_print_count_ = 0;
1651 void PrintWebViewHelper::IncrementScriptedPrintCount() {
1652 ++user_cancelled_scripted_print_count_;
1653 last_cancelled_script_print_ = base::Time::Now();
1656 void PrintWebViewHelper::ShowScriptedPrintPreview() {
1657 if (is_scripted_preview_delayed_) {
1658 is_scripted_preview_delayed_ = false;
1659 Send(new PrintHostMsg_ShowScriptedPrintPreview(routing_id(),
1660 print_preview_context_.IsModifiable()));
1664 void PrintWebViewHelper::RequestPrintPreview(PrintPreviewRequestType type) {
1665 const bool is_modifiable = print_preview_context_.IsModifiable();
1666 const bool has_selection = print_preview_context_.HasSelection();
1667 PrintHostMsg_RequestPrintPreview_Params params;
1668 params.is_modifiable = is_modifiable;
1669 params.has_selection = has_selection;
1671 case PRINT_PREVIEW_SCRIPTED: {
1672 // Shows scripted print preview in two stages.
1673 // 1. PrintHostMsg_SetupScriptedPrintPreview blocks this call and JS by
1674 // pumping messages here.
1675 // 2. PrintHostMsg_ShowScriptedPrintPreview shows preview once the
1676 // document has been loaded.
1677 is_scripted_preview_delayed_ = true;
1678 if (is_loading_ && GetPlugin(print_preview_context_.source_frame())) {
1679 // Wait for DidStopLoading. Plugins may not know the correct
1680 // |is_modifiable| value until they are fully loaded, which occurs when
1681 // DidStopLoading() is called. Defer showing the preview until then.
1683 base::MessageLoop::current()->PostTask(
1685 base::Bind(&PrintWebViewHelper::ShowScriptedPrintPreview,
1686 weak_ptr_factory_.GetWeakPtr()));
1688 IPC::SyncMessage* msg =
1689 new PrintHostMsg_SetupScriptedPrintPreview(routing_id());
1690 msg->EnableMessagePumping();
1692 is_scripted_preview_delayed_ = false;
1695 case PRINT_PREVIEW_USER_INITIATED_ENTIRE_FRAME: {
1698 case PRINT_PREVIEW_USER_INITIATED_SELECTION: {
1699 DCHECK(has_selection);
1700 params.selection_only = has_selection;
1703 case PRINT_PREVIEW_USER_INITIATED_CONTEXT_NODE: {
1704 params.webnode_only = true;
1712 Send(new PrintHostMsg_RequestPrintPreview(routing_id(), params));
1715 bool PrintWebViewHelper::CheckForCancel() {
1716 const PrintMsg_Print_Params& print_params = print_pages_params_->params;
1717 bool cancel = false;
1718 Send(new PrintHostMsg_CheckForCancel(routing_id(),
1719 print_params.preview_ui_id,
1720 print_params.preview_request_id,
1723 notify_browser_of_print_failure_ = false;
1727 bool PrintWebViewHelper::PreviewPageRendered(int page_number,
1728 Metafile* metafile) {
1729 DCHECK_GE(page_number, FIRST_PAGE_INDEX);
1731 // For non-modifiable files, |metafile| should be NULL, so do not bother
1732 // sending a message. If we don't generate draft metafiles, |metafile| is
1734 if (!print_preview_context_.IsModifiable() ||
1735 !print_preview_context_.generate_draft_pages()) {
1742 print_preview_context_.set_error(
1743 PREVIEW_ERROR_PAGE_RENDERED_WITHOUT_METAFILE);
1747 PrintHostMsg_DidPreviewPage_Params preview_page_params;
1748 // Get the size of the resulting metafile.
1749 uint32 buf_size = metafile->GetDataSize();
1750 DCHECK_GT(buf_size, 0u);
1751 if (!CopyMetafileDataToSharedMem(
1752 metafile, &(preview_page_params.metafile_data_handle))) {
1753 LOG(ERROR) << "CopyMetafileDataToSharedMem failed";
1754 print_preview_context_.set_error(PREVIEW_ERROR_METAFILE_COPY_FAILED);
1757 preview_page_params.data_size = buf_size;
1758 preview_page_params.page_number = page_number;
1759 preview_page_params.preview_request_id =
1760 print_pages_params_->params.preview_request_id;
1762 Send(new PrintHostMsg_DidPreviewPage(routing_id(), preview_page_params));
1766 PrintWebViewHelper::PrintPreviewContext::PrintPreviewContext()
1767 : total_page_count_(0),
1768 current_page_index_(0),
1769 generate_draft_pages_(true),
1770 print_ready_metafile_page_count_(0),
1771 error_(PREVIEW_ERROR_NONE),
1772 state_(UNINITIALIZED) {
1775 PrintWebViewHelper::PrintPreviewContext::~PrintPreviewContext() {
1778 void PrintWebViewHelper::PrintPreviewContext::InitWithFrame(
1779 blink::WebFrame* web_frame) {
1781 DCHECK(!IsRendering());
1782 state_ = INITIALIZED;
1783 source_frame_.Reset(web_frame);
1784 source_node_.reset();
1787 void PrintWebViewHelper::PrintPreviewContext::InitWithNode(
1788 const blink::WebNode& web_node) {
1789 DCHECK(!web_node.isNull());
1790 DCHECK(web_node.document().frame());
1791 DCHECK(!IsRendering());
1792 state_ = INITIALIZED;
1793 source_frame_.Reset(web_node.document().frame());
1794 source_node_ = web_node;
1797 void PrintWebViewHelper::PrintPreviewContext::OnPrintPreview() {
1798 DCHECK_EQ(INITIALIZED, state_);
1802 bool PrintWebViewHelper::PrintPreviewContext::CreatePreviewDocument(
1803 PrepareFrameAndViewForPrint* prepared_frame,
1804 const std::vector<int>& pages) {
1805 DCHECK_EQ(INITIALIZED, state_);
1808 // Need to make sure old object gets destroyed first.
1809 prep_frame_view_.reset(prepared_frame);
1810 prep_frame_view_->StartPrinting();
1812 total_page_count_ = prep_frame_view_->GetExpectedPageCount();
1813 if (total_page_count_ == 0) {
1814 LOG(ERROR) << "CreatePreviewDocument got 0 page count";
1815 set_error(PREVIEW_ERROR_ZERO_PAGES);
1819 metafile_.reset(new PreviewMetafile);
1820 if (!metafile_->Init()) {
1821 set_error(PREVIEW_ERROR_METAFILE_INIT_FAILED);
1822 LOG(ERROR) << "PreviewMetafile Init failed";
1826 current_page_index_ = 0;
1827 pages_to_render_ = pages;
1828 // Sort and make unique.
1829 std::sort(pages_to_render_.begin(), pages_to_render_.end());
1830 pages_to_render_.resize(std::unique(pages_to_render_.begin(),
1831 pages_to_render_.end()) -
1832 pages_to_render_.begin());
1833 // Remove invalid pages.
1834 pages_to_render_.resize(std::lower_bound(pages_to_render_.begin(),
1835 pages_to_render_.end(),
1836 total_page_count_) -
1837 pages_to_render_.begin());
1838 print_ready_metafile_page_count_ = pages_to_render_.size();
1839 if (pages_to_render_.empty()) {
1840 print_ready_metafile_page_count_ = total_page_count_;
1841 // Render all pages.
1842 for (int i = 0; i < total_page_count_; ++i)
1843 pages_to_render_.push_back(i);
1844 } else if (generate_draft_pages_) {
1845 int pages_index = 0;
1846 for (int i = 0; i < total_page_count_; ++i) {
1847 if (pages_index < print_ready_metafile_page_count_ &&
1848 i == pages_to_render_[pages_index]) {
1852 pages_to_render_.push_back(i);
1856 document_render_time_ = base::TimeDelta();
1857 begin_time_ = base::TimeTicks::Now();
1862 void PrintWebViewHelper::PrintPreviewContext::RenderedPreviewPage(
1863 const base::TimeDelta& page_time) {
1864 DCHECK_EQ(RENDERING, state_);
1865 document_render_time_ += page_time;
1866 UMA_HISTOGRAM_TIMES("PrintPreview.RenderPDFPageTime", page_time);
1869 void PrintWebViewHelper::PrintPreviewContext::AllPagesRendered() {
1870 DCHECK_EQ(RENDERING, state_);
1872 prep_frame_view_->FinishPrinting();
1875 void PrintWebViewHelper::PrintPreviewContext::FinalizePrintReadyDocument() {
1876 DCHECK(IsRendering());
1878 base::TimeTicks begin_time = base::TimeTicks::Now();
1879 metafile_->FinishDocument();
1881 if (print_ready_metafile_page_count_ <= 0) {
1886 UMA_HISTOGRAM_MEDIUM_TIMES("PrintPreview.RenderToPDFTime",
1887 document_render_time_);
1888 base::TimeDelta total_time = (base::TimeTicks::Now() - begin_time) +
1889 document_render_time_;
1890 UMA_HISTOGRAM_MEDIUM_TIMES("PrintPreview.RenderAndGeneratePDFTime",
1892 UMA_HISTOGRAM_MEDIUM_TIMES("PrintPreview.RenderAndGeneratePDFTimeAvgPerPage",
1893 total_time / pages_to_render_.size());
1896 void PrintWebViewHelper::PrintPreviewContext::Finished() {
1897 DCHECK_EQ(DONE, state_);
1898 state_ = INITIALIZED;
1902 void PrintWebViewHelper::PrintPreviewContext::Failed(bool report_error) {
1903 DCHECK(state_ == INITIALIZED || state_ == RENDERING);
1904 state_ = INITIALIZED;
1906 DCHECK_NE(PREVIEW_ERROR_NONE, error_);
1907 UMA_HISTOGRAM_ENUMERATION("PrintPreview.RendererError", error_,
1908 PREVIEW_ERROR_LAST_ENUM);
1913 int PrintWebViewHelper::PrintPreviewContext::GetNextPageNumber() {
1914 DCHECK_EQ(RENDERING, state_);
1915 if (IsFinalPageRendered())
1917 return pages_to_render_[current_page_index_++];
1920 bool PrintWebViewHelper::PrintPreviewContext::IsRendering() const {
1921 return state_ == RENDERING || state_ == DONE;
1924 bool PrintWebViewHelper::PrintPreviewContext::IsModifiable() {
1925 // The only kind of node we can print right now is a PDF node.
1926 return !PrintingNodeOrPdfFrame(source_frame(), source_node_);
1929 bool PrintWebViewHelper::PrintPreviewContext::HasSelection() {
1930 return IsModifiable() && source_frame()->hasSelection();
1933 bool PrintWebViewHelper::PrintPreviewContext::IsLastPageOfPrintReadyMetafile()
1935 DCHECK(IsRendering());
1936 return current_page_index_ == print_ready_metafile_page_count_;
1939 bool PrintWebViewHelper::PrintPreviewContext::IsFinalPageRendered() const {
1940 DCHECK(IsRendering());
1941 return static_cast<size_t>(current_page_index_) == pages_to_render_.size();
1944 void PrintWebViewHelper::PrintPreviewContext::set_generate_draft_pages(
1945 bool generate_draft_pages) {
1946 DCHECK_EQ(INITIALIZED, state_);
1947 generate_draft_pages_ = generate_draft_pages;
1950 void PrintWebViewHelper::PrintPreviewContext::set_error(
1951 enum PrintPreviewErrorBuckets error) {
1955 blink::WebFrame* PrintWebViewHelper::PrintPreviewContext::source_frame() {
1956 DCHECK(state_ != UNINITIALIZED);
1957 return source_frame_.GetFrame();
1960 const blink::WebNode&
1961 PrintWebViewHelper::PrintPreviewContext::source_node() const {
1962 DCHECK(state_ != UNINITIALIZED);
1963 return source_node_;
1966 blink::WebFrame* PrintWebViewHelper::PrintPreviewContext::prepared_frame() {
1967 DCHECK(state_ != UNINITIALIZED);
1968 return prep_frame_view_->frame();
1971 const blink::WebNode&
1972 PrintWebViewHelper::PrintPreviewContext::prepared_node() const {
1973 DCHECK(state_ != UNINITIALIZED);
1974 return prep_frame_view_->node();
1977 int PrintWebViewHelper::PrintPreviewContext::total_page_count() const {
1978 DCHECK(state_ != UNINITIALIZED);
1979 return total_page_count_;
1982 bool PrintWebViewHelper::PrintPreviewContext::generate_draft_pages() const {
1983 return generate_draft_pages_;
1986 PreviewMetafile* PrintWebViewHelper::PrintPreviewContext::metafile() {
1987 DCHECK(IsRendering());
1988 return metafile_.get();
1991 int PrintWebViewHelper::PrintPreviewContext::last_error() const {
1995 gfx::Size PrintWebViewHelper::PrintPreviewContext::GetPrintCanvasSize() const {
1996 DCHECK(IsRendering());
1997 return prep_frame_view_->GetPrintCanvasSize();
2000 void PrintWebViewHelper::PrintPreviewContext::ClearContext() {
2001 prep_frame_view_.reset();
2003 pages_to_render_.clear();
2004 error_ = PREVIEW_ERROR_NONE;
2007 } // namespace printing