1 // Copyright (c) 2012 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 #include "content/child/npapi/webplugin_delegate_impl.h"
12 #include "base/bind.h"
13 #include "base/compiler_specific.h"
14 #include "base/lazy_instance.h"
15 #include "base/memory/scoped_ptr.h"
16 #include "base/message_loop/message_loop.h"
17 #include "base/metrics/stats_counters.h"
18 #include "base/strings/string_util.h"
19 #include "base/strings/stringprintf.h"
20 #include "base/synchronization/lock.h"
21 #include "base/version.h"
22 #include "base/win/iat_patch_function.h"
23 #include "base/win/registry.h"
24 #include "base/win/windows_version.h"
25 #include "content/child/npapi/plugin_instance.h"
26 #include "content/child/npapi/plugin_lib.h"
27 #include "content/child/npapi/plugin_stream_url.h"
28 #include "content/child/npapi/webplugin.h"
29 #include "content/child/npapi/webplugin_ime_win.h"
30 #include "content/common/plugin_constants_win.h"
31 #include "content/public/common/content_constants.h"
32 #include "skia/ext/platform_canvas.h"
33 #include "third_party/WebKit/public/web/WebInputEvent.h"
34 #include "ui/gfx/win/dpi.h"
35 #include "ui/gfx/win/hwnd_util.h"
36 #include "webkit/common/cursors/webcursor.h"
38 using WebKit::WebKeyboardEvent;
39 using WebKit::WebInputEvent;
40 using WebKit::WebMouseEvent;
46 const wchar_t kWebPluginDelegateProperty[] = L"WebPluginDelegateProperty";
47 const wchar_t kPluginFlashThrottle[] = L"FlashThrottle";
49 // The fastest we are willing to process WM_USER+1 events for Flash.
50 // Flash can easily exceed the limits of our CPU if we don't throttle it.
51 // The throttle has been chosen by testing various delays and compromising
52 // on acceptable Flash performance and reasonable CPU consumption.
54 // I'd like to make the throttle delay variable, based on the amount of
55 // time currently required to paint Flash plugins. There isn't a good
56 // way to count the time spent in aggregate plugin painting, however, so
57 // this seems to work well enough.
58 const int kFlashWMUSERMessageThrottleDelayMs = 5;
60 // Flash displays popups in response to user clicks by posting a WM_USER
61 // message to the plugin window. The handler for this message displays
62 // the popup. To ensure that the popups allowed state is sent correctly
63 // to the renderer we reset the popups allowed state in a timer.
64 const int kWindowedPluginPopupTimerMs = 50;
66 // The current instance of the plugin which entered the modal loop.
67 WebPluginDelegateImpl* g_current_plugin_instance = NULL;
69 typedef std::deque<MSG> ThrottleQueue;
70 base::LazyInstance<ThrottleQueue> g_throttle_queue = LAZY_INSTANCE_INITIALIZER;
72 base::LazyInstance<std::map<HWND, WNDPROC> > g_window_handle_proc_map =
73 LAZY_INSTANCE_INITIALIZER;
75 // Helper object for patching the TrackPopupMenu API.
76 base::LazyInstance<base::win::IATPatchFunction> g_iat_patch_track_popup_menu =
77 LAZY_INSTANCE_INITIALIZER;
79 // Helper object for patching the SetCursor API.
80 base::LazyInstance<base::win::IATPatchFunction> g_iat_patch_set_cursor =
81 LAZY_INSTANCE_INITIALIZER;
83 // Helper object for patching the RegEnumKeyExW API.
84 base::LazyInstance<base::win::IATPatchFunction> g_iat_patch_reg_enum_key_ex_w =
85 LAZY_INSTANCE_INITIALIZER;
87 // Helper object for patching the GetProcAddress API.
88 base::LazyInstance<base::win::IATPatchFunction> g_iat_patch_get_proc_address =
89 LAZY_INSTANCE_INITIALIZER;
91 // http://crbug.com/16114
92 // Enforces providing a valid device context in NPWindow, so that NPP_SetWindow
93 // is never called with NPNWindoTypeDrawable and NPWindow set to NULL.
94 // Doing so allows removing NPP_SetWindow call during painting a windowless
95 // plugin, which otherwise could trigger layout change while painting by
96 // invoking NPN_Evaluate. Which would cause bad, bad crashes. Bad crashes.
97 // TODO(dglazkov): If this approach doesn't produce regressions, move class to
98 // webplugin_delegate_impl.h and implement for other platforms.
99 class DrawableContextEnforcer {
101 explicit DrawableContextEnforcer(NPWindow* window)
103 disposable_dc_(window && !window->window) {
104 // If NPWindow is NULL, create a device context with monochrome 1x1 surface
105 // and stuff it to NPWindow.
107 window_->window = CreateCompatibleDC(NULL);
110 ~DrawableContextEnforcer() {
114 DeleteDC(static_cast<HDC>(window_->window));
115 window_->window = NULL;
123 // These are from ntddk.h
124 typedef LONG NTSTATUS;
126 #ifndef STATUS_SUCCESS
127 #define STATUS_SUCCESS ((NTSTATUS)0x00000000L)
130 #ifndef STATUS_BUFFER_TOO_SMALL
131 #define STATUS_BUFFER_TOO_SMALL ((NTSTATUS)0xC0000023L)
134 typedef enum _KEY_INFORMATION_CLASS {
139 KeyCachedInformation,
140 KeyVirtualizationInformation
141 } KEY_INFORMATION_CLASS;
143 typedef struct _KEY_NAME_INFORMATION {
146 } KEY_NAME_INFORMATION, *PKEY_NAME_INFORMATION;
148 typedef DWORD (__stdcall *ZwQueryKeyType)(
150 int key_information_class,
151 PVOID key_information,
153 PULONG result_length);
155 // Returns a key's full path.
156 std::wstring GetKeyPath(HKEY key) {
160 HMODULE dll = GetModuleHandle(L"ntdll.dll");
164 ZwQueryKeyType func = reinterpret_cast<ZwQueryKeyType>(
165 ::GetProcAddress(dll, "ZwQueryKey"));
171 result = func(key, KeyNameInformation, 0, 0, &size);
172 if (result != STATUS_BUFFER_TOO_SMALL)
175 scoped_ptr<char[]> buffer(new char[size]);
176 if (buffer.get() == NULL)
179 result = func(key, KeyNameInformation, buffer.get(), size, &size);
180 if (result != STATUS_SUCCESS)
183 KEY_NAME_INFORMATION* info =
184 reinterpret_cast<KEY_NAME_INFORMATION*>(buffer.get());
185 return std::wstring(info->Name, info->NameLength / sizeof(wchar_t));
188 int GetPluginMajorVersion(const WebPluginInfo& plugin_info) {
189 Version plugin_version;
190 WebPluginInfo::CreateVersionFromString(plugin_info.version, &plugin_version);
192 int major_version = 0;
193 if (plugin_version.IsValid())
194 major_version = plugin_version.components()[0];
196 return major_version;
201 LRESULT CALLBACK WebPluginDelegateImpl::HandleEventMessageFilterHook(
202 int code, WPARAM wParam, LPARAM lParam) {
203 if (g_current_plugin_instance) {
204 g_current_plugin_instance->OnModalLoopEntered();
208 return CallNextHookEx(NULL, code, wParam, lParam);
211 LRESULT CALLBACK WebPluginDelegateImpl::MouseHookProc(
212 int code, WPARAM wParam, LPARAM lParam) {
213 if (code == HC_ACTION) {
214 MOUSEHOOKSTRUCT* hook_struct = reinterpret_cast<MOUSEHOOKSTRUCT*>(lParam);
216 HandleCaptureForMessage(hook_struct->hwnd, wParam);
219 return CallNextHookEx(NULL, code, wParam, lParam);
222 WebPluginDelegateImpl::WebPluginDelegateImpl(
224 PluginInstance* instance)
225 : instance_(instance),
229 windowed_handle_(NULL),
230 windowed_did_set_window_(false),
231 plugin_wnd_proc_(NULL),
233 is_calling_wndproc(false),
234 dummy_window_for_activation_(NULL),
235 dummy_window_parent_(NULL),
236 old_dummy_window_proc_(NULL),
237 handle_event_message_filter_hook_(NULL),
238 handle_event_pump_messages_event_(NULL),
239 user_gesture_message_posted_(false),
240 user_gesture_msg_factory_(this),
241 handle_event_depth_(0),
243 first_set_window_call_(true),
244 plugin_has_focus_(false),
245 has_webkit_focus_(false),
246 containing_view_has_focus_(true),
247 creation_succeeded_(false) {
248 memset(&window_, 0, sizeof(window_));
250 const WebPluginInfo& plugin_info = instance_->plugin_lib()->plugin_info();
251 std::wstring filename =
252 StringToLowerASCII(plugin_info.path.BaseName().value());
254 if (instance_->mime_type() == kFlashPluginSwfMimeType ||
255 filename == kFlashPlugin) {
256 // Flash only requests windowless plugins if we return a Mozilla user
258 instance_->set_use_mozilla_user_agent();
259 quirks_ |= PLUGIN_QUIRK_THROTTLE_WM_USER_PLUS_ONE;
260 quirks_ |= PLUGIN_QUIRK_PATCH_SETCURSOR;
261 quirks_ |= PLUGIN_QUIRK_ALWAYS_NOTIFY_SUCCESS;
262 quirks_ |= PLUGIN_QUIRK_HANDLE_MOUSE_CAPTURE;
263 quirks_ |= PLUGIN_QUIRK_EMULATE_IME;
264 } else if (filename == kAcrobatReaderPlugin) {
265 // Check for the version number above or equal 9.
266 int major_version = GetPluginMajorVersion(plugin_info);
267 if (major_version >= 9) {
268 quirks_ |= PLUGIN_QUIRK_DIE_AFTER_UNLOAD;
270 quirks_ |= PLUGIN_QUIRK_SETWINDOW_TWICE;
272 quirks_ |= PLUGIN_QUIRK_BLOCK_NONSTANDARD_GETURL_REQUESTS;
273 } else if (plugin_info.name.find(L"Windows Media Player") !=
274 std::wstring::npos) {
275 // Windows Media Player needs two NPP_SetWindow calls.
276 quirks_ |= PLUGIN_QUIRK_SETWINDOW_TWICE;
278 // Windowless mode doesn't work in the WMP NPAPI plugin.
279 quirks_ |= PLUGIN_QUIRK_NO_WINDOWLESS;
281 // The media player plugin sets its size on the first NPP_SetWindow call
282 // and never updates its size. We should call the underlying NPP_SetWindow
283 // only when we have the correct size.
284 quirks_ |= PLUGIN_QUIRK_IGNORE_FIRST_SETWINDOW_CALL;
286 if (filename == kOldWMPPlugin) {
287 // Non-admin users on XP couldn't modify the key to force the new UI.
288 quirks_ |= PLUGIN_QUIRK_PATCH_REGENUMKEYEXW;
290 } else if (instance_->mime_type() == "audio/x-pn-realaudio-plugin" ||
291 filename == kRealPlayerPlugin) {
292 quirks_ |= PLUGIN_QUIRK_DONT_CALL_WND_PROC_RECURSIVELY;
293 } else if (plugin_info.name.find(L"VLC Multimedia Plugin") !=
294 std::wstring::npos ||
295 plugin_info.name.find(L"VLC Multimedia Plug-in") !=
296 std::wstring::npos) {
297 // VLC hangs on NPP_Destroy if we call NPP_SetWindow with a null window
299 quirks_ |= PLUGIN_QUIRK_DONT_SET_NULL_WINDOW_HANDLE_ON_DESTROY;
300 int major_version = GetPluginMajorVersion(plugin_info);
301 if (major_version == 0) {
302 // VLC 0.8.6d and 0.8.6e crash if multiple instances are created.
303 quirks_ |= PLUGIN_QUIRK_DONT_ALLOW_MULTIPLE_INSTANCES;
305 } else if (filename == kSilverlightPlugin) {
306 // Explanation for this quirk can be found in
307 // WebPluginDelegateImpl::Initialize.
308 quirks_ |= PLUGIN_QUIRK_PATCH_SETCURSOR;
309 } else if (plugin_info.name.find(L"DivX Web Player") !=
310 std::wstring::npos) {
311 // The divx plugin sets its size on the first NPP_SetWindow call and never
312 // updates its size. We should call the underlying NPP_SetWindow only when
313 // we have the correct size.
314 quirks_ |= PLUGIN_QUIRK_IGNORE_FIRST_SETWINDOW_CALL;
318 WebPluginDelegateImpl::~WebPluginDelegateImpl() {
319 if (::IsWindow(dummy_window_for_activation_)) {
320 WNDPROC current_wnd_proc = reinterpret_cast<WNDPROC>(
321 GetWindowLongPtr(dummy_window_for_activation_, GWLP_WNDPROC));
322 if (current_wnd_proc == DummyWindowProc) {
323 SetWindowLongPtr(dummy_window_for_activation_,
325 reinterpret_cast<LONG_PTR>(old_dummy_window_proc_));
327 ::DestroyWindow(dummy_window_for_activation_);
333 WindowedDestroyWindow();
335 if (handle_event_pump_messages_event_) {
336 CloseHandle(handle_event_pump_messages_event_);
340 bool WebPluginDelegateImpl::PlatformInitialize() {
341 plugin_->SetWindow(windowed_handle_);
344 CreateDummyWindowForActivation();
345 handle_event_pump_messages_event_ = CreateEvent(NULL, TRUE, FALSE, NULL);
346 plugin_->SetWindowlessData(
347 handle_event_pump_messages_event_,
348 reinterpret_cast<gfx::NativeViewId>(dummy_window_for_activation_));
351 // Windowless plugins call the WindowFromPoint API and passes the result of
352 // that to the TrackPopupMenu API call as the owner window. This causes the
353 // API to fail as the API expects the window handle to live on the same
354 // thread as the caller. It works in the other browsers as the plugin lives
355 // on the browser thread. Our workaround is to intercept the TrackPopupMenu
356 // API and replace the window handle with the dummy activation window.
357 if (windowless_ && !g_iat_patch_track_popup_menu.Pointer()->is_patched()) {
358 g_iat_patch_track_popup_menu.Pointer()->Patch(
359 GetPluginPath().value().c_str(), "user32.dll", "TrackPopupMenu",
360 WebPluginDelegateImpl::TrackPopupMenuPatch);
363 // Windowless plugins can set cursors by calling the SetCursor API. This
364 // works because the thread inputs of the browser UI thread and the plugin
365 // thread are attached. We intercept the SetCursor API for windowless
366 // plugins and remember the cursor being set. This is shipped over to the
367 // browser in the HandleEvent call, which ensures that the cursor does not
368 // change when a windowless plugin instance changes the cursor
369 // in a background tab.
370 if (windowless_ && !g_iat_patch_set_cursor.Pointer()->is_patched() &&
371 (quirks_ & PLUGIN_QUIRK_PATCH_SETCURSOR)) {
372 g_iat_patch_set_cursor.Pointer()->Patch(
373 GetPluginPath().value().c_str(), "user32.dll", "SetCursor",
374 WebPluginDelegateImpl::SetCursorPatch);
377 // The windowed flash plugin has a bug which occurs when the plugin enters
378 // fullscreen mode. It basically captures the mouse on WM_LBUTTONDOWN and
379 // does not release capture correctly causing it to stop receiving
380 // subsequent mouse events. This problem is also seen in Safari where there
381 // is code to handle this in the wndproc. However the plugin subclasses the
382 // window again in WM_LBUTTONDOWN before entering full screen. As a result
383 // Safari does not receive the WM_LBUTTONUP message. To workaround this
384 // issue we use a per thread mouse hook. This bug does not occur in Firefox
385 // and opera. Firefox has code similar to Safari. It could well be a bug in
386 // the flash plugin, which only occurs in webkit based browsers.
387 if (quirks_ & PLUGIN_QUIRK_HANDLE_MOUSE_CAPTURE) {
388 mouse_hook_ = SetWindowsHookEx(WH_MOUSE, MouseHookProc, NULL,
389 GetCurrentThreadId());
392 // On XP, WMP will use its old UI unless a registry key under HKLM has the
393 // name of the current process. We do it in the installer for admin users,
394 // for the rest patch this function.
395 if ((quirks_ & PLUGIN_QUIRK_PATCH_REGENUMKEYEXW) &&
396 base::win::GetVersion() == base::win::VERSION_XP &&
397 (base::win::RegKey().Open(HKEY_LOCAL_MACHINE,
398 L"SOFTWARE\\Microsoft\\MediaPlayer\\ShimInclusionList\\chrome.exe",
399 KEY_READ) != ERROR_SUCCESS) &&
400 !g_iat_patch_reg_enum_key_ex_w.Pointer()->is_patched()) {
401 g_iat_patch_reg_enum_key_ex_w.Pointer()->Patch(
402 L"wmpdxm.dll", "advapi32.dll", "RegEnumKeyExW",
403 WebPluginDelegateImpl::RegEnumKeyExWPatch);
406 // Flash retrieves the pointers to IMM32 functions with GetProcAddress() calls
407 // and use them to retrieve IME data. We add a patch to this function so we
408 // can dispatch these IMM32 calls to the WebPluginIMEWin class, which emulates
409 // IMM32 functions for Flash.
410 if (!g_iat_patch_get_proc_address.Pointer()->is_patched() &&
411 (quirks_ & PLUGIN_QUIRK_EMULATE_IME)) {
412 g_iat_patch_get_proc_address.Pointer()->Patch(
413 GetPluginPath().value().c_str(), "kernel32.dll", "GetProcAddress",
414 GetProcAddressPatch);
420 void WebPluginDelegateImpl::PlatformDestroyInstance() {
421 if (!instance_->plugin_lib())
424 // Unpatch if this is the last plugin instance.
425 if (instance_->plugin_lib()->instance_count() != 1)
428 if (g_iat_patch_set_cursor.Pointer()->is_patched())
429 g_iat_patch_set_cursor.Pointer()->Unpatch();
431 if (g_iat_patch_track_popup_menu.Pointer()->is_patched())
432 g_iat_patch_track_popup_menu.Pointer()->Unpatch();
434 if (g_iat_patch_reg_enum_key_ex_w.Pointer()->is_patched())
435 g_iat_patch_reg_enum_key_ex_w.Pointer()->Unpatch();
438 UnhookWindowsHookEx(mouse_hook_);
443 void WebPluginDelegateImpl::Paint(SkCanvas* canvas, const gfx::Rect& rect) {
444 if (windowless_ && skia::SupportsPlatformPaint(canvas)) {
445 skia::ScopedPlatformPaint scoped_platform_paint(canvas);
446 HDC hdc = scoped_platform_paint.GetPlatformSurface();
447 WindowlessPaint(hdc, rect);
451 bool WebPluginDelegateImpl::WindowedCreatePlugin() {
452 DCHECK(!windowed_handle_);
454 RegisterNativeWindowClass();
456 // The window will be sized and shown later.
457 windowed_handle_ = CreateWindowEx(
458 WS_EX_LEFT | WS_EX_LTRREADING | WS_EX_RIGHTSCROLLBAR,
459 kNativeWindowClassName,
461 WS_POPUP | WS_CLIPCHILDREN | WS_CLIPSIBLINGS,
468 GetModuleHandle(NULL),
470 if (windowed_handle_ == 0)
473 // This is a tricky workaround for Issue 2673 in chromium "Flash: IME not
474 // available". To use IMEs in this window, we have to make Windows attach
475 // IMEs to this window (i.e. load IME DLLs, attach them to this process, and
476 // add their message hooks to this window). Windows attaches IMEs while this
477 // process creates a top-level window. On the other hand, to layout this
478 // window correctly in the given parent window (RenderWidgetHostViewWin or
479 // RenderWidgetHostViewAura), this window should be a child window of the
480 // parent window. To satisfy both of the above conditions, this code once
481 // creates a top-level window and change it to a child window of the parent
482 // window (in the browser process).
483 SetWindowLongPtr(windowed_handle_, GWL_STYLE,
484 WS_CHILD | WS_CLIPCHILDREN | WS_CLIPSIBLINGS);
486 BOOL result = SetProp(windowed_handle_, kWebPluginDelegateProperty, this);
487 DCHECK(result == TRUE) << "SetProp failed, last error = " << GetLastError();
488 // Get the name and version of the plugin, create atoms and set them in a
489 // window property. Use atoms so that other processes can access the name and
490 // version of the plugin that this window is hosting.
491 if (instance_ != NULL) {
492 PluginLib* plugin_lib = instance()->plugin_lib();
493 if (plugin_lib != NULL) {
494 std::wstring plugin_name = plugin_lib->plugin_info().name;
495 if (!plugin_name.empty()) {
496 ATOM plugin_name_atom = GlobalAddAtomW(plugin_name.c_str());
497 DCHECK_NE(0, plugin_name_atom);
498 result = SetProp(windowed_handle_,
499 kPluginNameAtomProperty,
500 reinterpret_cast<HANDLE>(plugin_name_atom));
501 DCHECK(result == TRUE) << "SetProp failed, last error = " <<
504 base::string16 plugin_version = plugin_lib->plugin_info().version;
505 if (!plugin_version.empty()) {
506 ATOM plugin_version_atom = GlobalAddAtomW(plugin_version.c_str());
507 DCHECK_NE(0, plugin_version_atom);
508 result = SetProp(windowed_handle_,
509 kPluginVersionAtomProperty,
510 reinterpret_cast<HANDLE>(plugin_version_atom));
511 DCHECK(result == TRUE) << "SetProp failed, last error = " <<
517 // Calling SetWindowLongPtrA here makes the window proc ASCII, which is
518 // required by at least the Shockwave Director plug-in.
519 SetWindowLongPtrA(windowed_handle_,
521 reinterpret_cast<LONG_PTR>(DefWindowProcA));
526 void WebPluginDelegateImpl::WindowedDestroyWindow() {
527 if (windowed_handle_ != NULL) {
528 // Unsubclass the window.
529 WNDPROC current_wnd_proc = reinterpret_cast<WNDPROC>(
530 GetWindowLongPtr(windowed_handle_, GWLP_WNDPROC));
531 if (current_wnd_proc == NativeWndProc) {
532 SetWindowLongPtr(windowed_handle_,
534 reinterpret_cast<LONG_PTR>(plugin_wnd_proc_));
537 plugin_->WillDestroyWindow(windowed_handle_);
539 DestroyWindow(windowed_handle_);
540 windowed_handle_ = 0;
544 // Erase all messages in the queue destined for a particular window.
545 // When windows are closing, callers should use this function to clear
548 void WebPluginDelegateImpl::ClearThrottleQueueForWindow(HWND window) {
549 ThrottleQueue* throttle_queue = g_throttle_queue.Pointer();
551 ThrottleQueue::iterator it;
552 for (it = throttle_queue->begin(); it != throttle_queue->end(); ) {
553 if (it->hwnd == window) {
554 it = throttle_queue->erase(it);
561 // Delayed callback for processing throttled messages.
562 // Throttled messages are aggregated globally across all plugins.
564 void WebPluginDelegateImpl::OnThrottleMessage() {
565 // The current algorithm walks the list and processes the first
566 // message it finds for each plugin. It is important to service
567 // all active plugins with each pass through the throttle, otherwise
568 // we see video jankiness. Copy the set to notify before notifying
569 // since we may re-enter OnThrottleMessage from CallWindowProc!
570 ThrottleQueue* throttle_queue = g_throttle_queue.Pointer();
571 ThrottleQueue notify_queue;
572 std::set<HWND> processed;
574 ThrottleQueue::iterator it = throttle_queue->begin();
575 while (it != throttle_queue->end()) {
576 const MSG& msg = *it;
577 if (processed.find(msg.hwnd) == processed.end()) {
578 processed.insert(msg.hwnd);
579 notify_queue.push_back(msg);
580 it = throttle_queue->erase(it);
586 // Due to re-entrancy, we must save our queue state now. Otherwise, we may
587 // self-post below, and *also* start up another delayed task when the first
588 // entry is pushed onto the queue in ThrottleMessage().
589 bool throttle_queue_was_empty = throttle_queue->empty();
591 for (it = notify_queue.begin(); it != notify_queue.end(); ++it) {
592 const MSG& msg = *it;
593 WNDPROC proc = reinterpret_cast<WNDPROC>(msg.time);
594 // It is possible that the window was closed after we queued
595 // this message. This is a rare event; just verify the window
596 // is alive. (see also bug 1259488)
597 if (IsWindow(msg.hwnd))
598 CallWindowProc(proc, msg.hwnd, msg.message, msg.wParam, msg.lParam);
601 if (!throttle_queue_was_empty) {
602 base::MessageLoop::current()->PostDelayedTask(
604 base::Bind(&WebPluginDelegateImpl::OnThrottleMessage),
605 base::TimeDelta::FromMilliseconds(kFlashWMUSERMessageThrottleDelayMs));
609 // Schedule a windows message for delivery later.
611 void WebPluginDelegateImpl::ThrottleMessage(WNDPROC proc, HWND hwnd,
612 UINT message, WPARAM wParam,
615 msg.time = reinterpret_cast<DWORD>(proc);
617 msg.message = message;
621 ThrottleQueue* throttle_queue = g_throttle_queue.Pointer();
623 throttle_queue->push_back(msg);
625 if (throttle_queue->size() == 1) {
626 base::MessageLoop::current()->PostDelayedTask(
628 base::Bind(&WebPluginDelegateImpl::OnThrottleMessage),
629 base::TimeDelta::FromMilliseconds(kFlashWMUSERMessageThrottleDelayMs));
633 // We go out of our way to find the hidden windows created by Flash for
634 // windowless plugins. We throttle the rate at which they deliver messages
635 // so that they will not consume outrageous amounts of CPU.
637 LRESULT CALLBACK WebPluginDelegateImpl::FlashWindowlessWndProc(
638 HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam) {
639 std::map<HWND, WNDPROC>::iterator index =
640 g_window_handle_proc_map.Get().find(hwnd);
642 WNDPROC old_proc = (*index).second;
647 WebPluginDelegateImpl::ClearThrottleQueueForWindow(hwnd);
648 g_window_handle_proc_map.Get().erase(index);
651 // Flash may flood the message queue with WM_USER+1 message causing 100% CPU
652 // usage. See https://bugzilla.mozilla.org/show_bug.cgi?id=132759. We
653 // prevent this by throttling the messages.
655 WebPluginDelegateImpl::ThrottleMessage(old_proc, hwnd, message, wparam,
664 return CallWindowProc(old_proc, hwnd, message, wparam, lparam);
667 LRESULT CALLBACK WebPluginDelegateImpl::DummyWindowProc(
668 HWND hwnd, UINT message, WPARAM w_param, LPARAM l_param) {
669 WebPluginDelegateImpl* delegate = reinterpret_cast<WebPluginDelegateImpl*>(
670 GetProp(hwnd, kWebPluginDelegateProperty));
672 if (message == WM_WINDOWPOSCHANGING) {
673 // We need to know when the dummy window is parented because windowless
674 // plugins need the parent window for things like menus. There's no message
675 // for a parent being changed, but a WM_WINDOWPOSCHANGING is sent so we
676 // check every time we get it.
677 // For non-aura builds, this never changes since RenderWidgetHostViewWin's
678 // window is constant. For aura builds, this changes every time the tab gets
679 // dragged to a new window.
680 HWND parent = GetParent(hwnd);
681 if (parent != delegate->dummy_window_parent_) {
682 delegate->dummy_window_parent_ = parent;
684 // Set the containing window handle as the instance window handle. This is
685 // what Safari does. Not having a valid window handle causes subtle bugs
686 // with plugins which retrieve the window handle and use it for things
687 // like context menus. The window handle can be retrieved via
688 // NPN_GetValue of NPNVnetscapeWindow.
689 delegate->instance_->set_window_handle(parent);
691 // The plugin caches the result of NPNVnetscapeWindow when we originally
692 // called NPP_SetWindow, so force it to get the new value.
693 delegate->WindowlessSetWindow();
695 } else if (message == WM_NCDESTROY) {
696 RemoveProp(hwnd, kWebPluginDelegateProperty);
698 return CallWindowProc(
699 delegate->old_dummy_window_proc_, hwnd, message, w_param, l_param);
702 // Callback for enumerating the Flash windows.
703 BOOL CALLBACK EnumFlashWindows(HWND window, LPARAM arg) {
704 WNDPROC wnd_proc = reinterpret_cast<WNDPROC>(arg);
705 TCHAR class_name[1024];
706 if (!RealGetWindowClass(window, class_name,
707 sizeof(class_name)/sizeof(TCHAR))) {
708 LOG(ERROR) << "RealGetWindowClass failure: " << GetLastError();
712 if (wcscmp(class_name, L"SWFlash_PlaceholderX"))
715 WNDPROC current_wnd_proc = reinterpret_cast<WNDPROC>(
716 GetWindowLongPtr(window, GWLP_WNDPROC));
717 if (current_wnd_proc != wnd_proc) {
718 WNDPROC old_flash_proc = reinterpret_cast<WNDPROC>(SetWindowLongPtr(
719 window, GWLP_WNDPROC,
720 reinterpret_cast<LONG_PTR>(wnd_proc)));
721 DCHECK(old_flash_proc);
722 g_window_handle_proc_map.Get()[window] = old_flash_proc;
728 bool WebPluginDelegateImpl::CreateDummyWindowForActivation() {
729 DCHECK(!dummy_window_for_activation_);
731 dummy_window_for_activation_ = CreateWindowEx(
734 kDummyActivationWindowName,
740 // We don't know the parent of the dummy window yet, so just set it to the
741 // desktop and it'll get parented by the browser.
744 GetModuleHandle(NULL),
747 if (dummy_window_for_activation_ == 0)
750 BOOL result = SetProp(dummy_window_for_activation_,
751 kWebPluginDelegateProperty, this);
752 DCHECK(result == TRUE) << "SetProp failed, last error = " << GetLastError();
753 old_dummy_window_proc_ = reinterpret_cast<WNDPROC>(SetWindowLongPtr(
754 dummy_window_for_activation_, GWLP_WNDPROC,
755 reinterpret_cast<LONG_PTR>(DummyWindowProc)));
757 // Flash creates background windows which use excessive CPU in our
758 // environment; we wrap these windows and throttle them so that they don't
760 if (!EnumThreadWindows(::GetCurrentThreadId(), EnumFlashWindows,
761 reinterpret_cast<LPARAM>(
762 &WebPluginDelegateImpl::FlashWindowlessWndProc))) {
763 // Log that this happened. Flash will still work; it just means the
764 // throttle isn't installed (and Flash will use more CPU).
766 LOG(ERROR) << "Failed to wrap all windowless Flash windows";
771 bool WebPluginDelegateImpl::WindowedReposition(
772 const gfx::Rect& window_rect_in_dip,
773 const gfx::Rect& clip_rect_in_dip) {
774 if (!windowed_handle_) {
779 gfx::Rect window_rect = gfx::win::DIPToScreenRect(window_rect_in_dip);
780 gfx::Rect clip_rect = gfx::win::DIPToScreenRect(clip_rect_in_dip);
781 if (window_rect_ == window_rect && clip_rect_ == clip_rect)
784 // We only set the plugin's size here. Its position is moved elsewhere, which
785 // allows the window moves/scrolling/clipping to be synchronized with the page
786 // and other windows.
787 // If the plugin window has no parent, then don't focus it because it isn't
788 // being displayed anywhere. See:
789 // http://code.google.com/p/chromium/issues/detail?id=32658
790 if (window_rect.size() != window_rect_.size()) {
791 UINT flags = SWP_NOMOVE | SWP_NOZORDER;
792 if (!GetParent(windowed_handle_))
793 flags |= SWP_NOACTIVATE;
794 ::SetWindowPos(windowed_handle_,
799 window_rect.height(),
803 window_rect_ = window_rect;
804 clip_rect_ = clip_rect;
806 // Ensure that the entire window gets repainted.
807 ::InvalidateRect(windowed_handle_, NULL, FALSE);
812 void WebPluginDelegateImpl::WindowedSetWindow() {
816 if (!windowed_handle_) {
821 instance()->set_window_handle(windowed_handle_);
823 DCHECK(!instance()->windowless());
825 window_.clipRect.top = std::max(0, clip_rect_.y());
826 window_.clipRect.left = std::max(0, clip_rect_.x());
827 window_.clipRect.bottom = std::max(0, clip_rect_.y() + clip_rect_.height());
828 window_.clipRect.right = std::max(0, clip_rect_.x() + clip_rect_.width());
829 window_.height = window_rect_.height();
830 window_.width = window_rect_.width();
834 window_.window = windowed_handle_;
835 window_.type = NPWindowTypeWindow;
837 // Reset this flag before entering the instance in case of side-effects.
838 windowed_did_set_window_ = true;
840 NPError err = instance()->NPP_SetWindow(&window_);
841 if (quirks_ & PLUGIN_QUIRK_SETWINDOW_TWICE)
842 instance()->NPP_SetWindow(&window_);
844 WNDPROC current_wnd_proc = reinterpret_cast<WNDPROC>(
845 GetWindowLongPtr(windowed_handle_, GWLP_WNDPROC));
846 if (current_wnd_proc != NativeWndProc) {
847 plugin_wnd_proc_ = reinterpret_cast<WNDPROC>(
848 SetWindowLongPtr(windowed_handle_,
850 reinterpret_cast<LONG_PTR>(NativeWndProc)));
854 ATOM WebPluginDelegateImpl::RegisterNativeWindowClass() {
855 static bool have_registered_window_class = false;
856 if (have_registered_window_class == true)
859 have_registered_window_class = true;
862 wcex.cbSize = sizeof(WNDCLASSEX);
863 wcex.style = CS_DBLCLKS;
864 wcex.lpfnWndProc = WrapperWindowProc;
867 wcex.hInstance = GetModuleHandle(NULL);
870 // Some plugins like windows media player 11 create child windows parented
871 // by our plugin window, where the media content is rendered. These plugins
872 // dont implement WM_ERASEBKGND, which causes painting issues, when the
873 // window where the media is rendered is moved around. DefWindowProc does
874 // implement WM_ERASEBKGND correctly if we have a valid background brush.
875 wcex.hbrBackground = reinterpret_cast<HBRUSH>(COLOR_WINDOW+1);
876 wcex.lpszMenuName = 0;
877 wcex.lpszClassName = kNativeWindowClassName;
880 return RegisterClassEx(&wcex);
883 LRESULT CALLBACK WebPluginDelegateImpl::WrapperWindowProc(
884 HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
885 // This is another workaround for Issue 2673 in chromium "Flash: IME not
886 // available". Somehow, the CallWindowProc() function does not dispatch
887 // window messages when its first parameter is a handle representing the
888 // DefWindowProc() function. To avoid this problem, this code creates a
889 // wrapper function which just encapsulates the DefWindowProc() function
890 // and set it as the window procedure of a windowed plug-in.
891 return DefWindowProc(hWnd, message, wParam, lParam);
894 // Returns true if the message passed in corresponds to a user gesture.
895 static bool IsUserGestureMessage(unsigned int message) {
914 LRESULT CALLBACK WebPluginDelegateImpl::NativeWndProc(
915 HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam) {
916 WebPluginDelegateImpl* delegate = reinterpret_cast<WebPluginDelegateImpl*>(
917 GetProp(hwnd, kWebPluginDelegateProperty));
923 if (message == delegate->last_message_ &&
924 delegate->GetQuirks() & PLUGIN_QUIRK_DONT_CALL_WND_PROC_RECURSIVELY &&
925 delegate->is_calling_wndproc) {
926 // Real may go into a state where it recursively dispatches the same event
927 // when subclassed. See https://bugzilla.mozilla.org/show_bug.cgi?id=192914
928 // We only do the recursive check for Real because it's possible and valid
929 // for a plugin to synchronously dispatch a message to itself such that it
930 // looks like it's in recursion.
934 // Flash may flood the message queue with WM_USER+1 message causing 100% CPU
935 // usage. See https://bugzilla.mozilla.org/show_bug.cgi?id=132759. We
936 // prevent this by throttling the messages.
937 if (message == WM_USER + 1 &&
938 delegate->GetQuirks() & PLUGIN_QUIRK_THROTTLE_WM_USER_PLUS_ONE) {
939 WebPluginDelegateImpl::ThrottleMessage(delegate->plugin_wnd_proc_, hwnd,
940 message, wparam, lparam);
945 uint32 old_message = delegate->last_message_;
946 delegate->last_message_ = message;
948 static UINT custom_msg = RegisterWindowMessage(kPaintMessageName);
949 if (message == custom_msg) {
950 // Get the invalid rect which is in screen coordinates and convert to
951 // window coordinates.
952 gfx::Rect invalid_rect;
953 invalid_rect.set_x(static_cast<short>(LOWORD(wparam)));
954 invalid_rect.set_y(static_cast<short>(HIWORD(wparam)));
955 invalid_rect.set_width(static_cast<short>(LOWORD(lparam)));
956 invalid_rect.set_height(static_cast<short>(HIWORD(lparam)));
959 GetWindowRect(hwnd, &window_rect);
960 invalid_rect.Offset(-window_rect.left, -window_rect.top);
962 // The plugin window might have non-client area. If we don't pass in
963 // RDW_FRAME then the children don't receive WM_NCPAINT messages while
964 // scrolling, which causes painting problems (http://b/issue?id=923945).
965 uint32 flags = RDW_INVALIDATE | RDW_ALLCHILDREN | RDW_FRAME;
967 // If a plugin (like Google Earth or Java) has child windows that are hosted
968 // in a different process, then RedrawWindow with UPDATENOW will
969 // synchronously wait for this call to complete. Some messages are pumped
970 // but not others, which could lead to a deadlock. So avoid reentrancy by
971 // only synchronously calling RedrawWindow once at a time.
972 if (old_message != custom_msg)
973 flags |= RDW_UPDATENOW;
974 RECT rect = invalid_rect.ToRECT();
975 RedrawWindow(hwnd, &rect, NULL, flags);
978 delegate->is_calling_wndproc = true;
980 if (!delegate->user_gesture_message_posted_ &&
981 IsUserGestureMessage(message)) {
982 delegate->user_gesture_message_posted_ = true;
984 delegate->instance()->PushPopupsEnabledState(true);
986 base::MessageLoop::current()->PostDelayedTask(
988 base::Bind(&WebPluginDelegateImpl::OnUserGestureEnd,
989 delegate->user_gesture_msg_factory_.GetWeakPtr()),
990 base::TimeDelta::FromMilliseconds(kWindowedPluginPopupTimerMs));
993 HandleCaptureForMessage(hwnd, message);
995 // Maintain a local/global stack for the g_current_plugin_instance variable
996 // as this may be a nested invocation.
997 WebPluginDelegateImpl* last_plugin_instance = g_current_plugin_instance;
999 g_current_plugin_instance = delegate;
1001 result = CallWindowProc(
1002 delegate->plugin_wnd_proc_, hwnd, message, wparam, lparam);
1004 delegate->is_calling_wndproc = false;
1005 g_current_plugin_instance = last_plugin_instance;
1007 if (message == WM_NCDESTROY) {
1008 RemoveProp(hwnd, kWebPluginDelegateProperty);
1009 ATOM plugin_name_atom = reinterpret_cast<ATOM>(
1010 RemoveProp(hwnd, kPluginNameAtomProperty));
1011 if (plugin_name_atom != 0)
1012 GlobalDeleteAtom(plugin_name_atom);
1013 ATOM plugin_version_atom = reinterpret_cast<ATOM>(
1014 RemoveProp(hwnd, kPluginVersionAtomProperty));
1015 if (plugin_version_atom != 0)
1016 GlobalDeleteAtom(plugin_version_atom);
1017 ClearThrottleQueueForWindow(hwnd);
1020 delegate->last_message_ = old_message;
1024 void WebPluginDelegateImpl::WindowlessUpdateGeometry(
1025 const gfx::Rect& window_rect,
1026 const gfx::Rect& clip_rect) {
1027 bool window_rect_changed = (window_rect_ != window_rect);
1028 // Only resend to the instance if the geometry has changed.
1029 if (!window_rect_changed && clip_rect == clip_rect_)
1032 clip_rect_ = clip_rect;
1033 window_rect_ = window_rect;
1035 WindowlessSetWindow();
1037 if (window_rect_changed) {
1038 WINDOWPOS win_pos = {0};
1039 win_pos.x = window_rect_.x();
1040 win_pos.y = window_rect_.y();
1041 win_pos.cx = window_rect_.width();
1042 win_pos.cy = window_rect_.height();
1044 NPEvent pos_changed_event;
1045 pos_changed_event.event = WM_WINDOWPOSCHANGED;
1046 pos_changed_event.wParam = 0;
1047 pos_changed_event.lParam = PtrToUlong(&win_pos);
1049 instance()->NPP_HandleEvent(&pos_changed_event);
1053 void WebPluginDelegateImpl::WindowlessPaint(HDC hdc,
1054 const gfx::Rect& damage_rect) {
1057 RECT damage_rect_win;
1058 damage_rect_win.left = damage_rect.x(); // + window_rect_.x();
1059 damage_rect_win.top = damage_rect.y(); // + window_rect_.y();
1060 damage_rect_win.right = damage_rect_win.left + damage_rect.width();
1061 damage_rect_win.bottom = damage_rect_win.top + damage_rect.height();
1063 // Save away the old HDC as this could be a nested invocation.
1064 void* old_dc = window_.window;
1065 window_.window = hdc;
1067 NPEvent paint_event;
1068 paint_event.event = WM_PAINT;
1069 // NOTE: NPAPI is not 64bit safe. It puts pointers into 32bit values.
1070 paint_event.wParam = PtrToUlong(hdc);
1071 paint_event.lParam = PtrToUlong(&damage_rect_win);
1072 base::StatsRate plugin_paint("Plugin.Paint");
1073 base::StatsScope<base::StatsRate> scope(plugin_paint);
1074 instance()->NPP_HandleEvent(&paint_event);
1075 window_.window = old_dc;
1078 void WebPluginDelegateImpl::WindowlessSetWindow() {
1082 if (window_rect_.IsEmpty()) // wait for geometry to be set.
1085 DCHECK(instance()->windowless());
1087 window_.clipRect.top = clip_rect_.y();
1088 window_.clipRect.left = clip_rect_.x();
1089 window_.clipRect.bottom = clip_rect_.y() + clip_rect_.height();
1090 window_.clipRect.right = clip_rect_.x() + clip_rect_.width();
1091 window_.height = window_rect_.height();
1092 window_.width = window_rect_.width();
1093 window_.x = window_rect_.x();
1094 window_.y = window_rect_.y();
1095 window_.type = NPWindowTypeDrawable;
1096 DrawableContextEnforcer enforcer(&window_);
1098 NPError err = instance()->NPP_SetWindow(&window_);
1099 DCHECK(err == NPERR_NO_ERROR);
1102 bool WebPluginDelegateImpl::PlatformSetPluginHasFocus(bool focused) {
1103 DCHECK(instance()->windowless());
1105 NPEvent focus_event;
1106 focus_event.event = focused ? WM_SETFOCUS : WM_KILLFOCUS;
1107 focus_event.wParam = 0;
1108 focus_event.lParam = 0;
1110 instance()->NPP_HandleEvent(&focus_event);
1114 static bool NPEventFromWebMouseEvent(const WebMouseEvent& event,
1115 NPEvent* np_event) {
1116 np_event->lParam = static_cast<uint32>(MAKELPARAM(event.windowX,
1118 np_event->wParam = 0;
1120 if (event.modifiers & WebInputEvent::ControlKey)
1121 np_event->wParam |= MK_CONTROL;
1122 if (event.modifiers & WebInputEvent::ShiftKey)
1123 np_event->wParam |= MK_SHIFT;
1124 if (event.modifiers & WebInputEvent::LeftButtonDown)
1125 np_event->wParam |= MK_LBUTTON;
1126 if (event.modifiers & WebInputEvent::MiddleButtonDown)
1127 np_event->wParam |= MK_MBUTTON;
1128 if (event.modifiers & WebInputEvent::RightButtonDown)
1129 np_event->wParam |= MK_RBUTTON;
1131 switch (event.type) {
1132 case WebInputEvent::MouseMove:
1133 case WebInputEvent::MouseLeave:
1134 case WebInputEvent::MouseEnter:
1135 np_event->event = WM_MOUSEMOVE;
1137 case WebInputEvent::MouseDown:
1138 switch (event.button) {
1139 case WebMouseEvent::ButtonLeft:
1140 np_event->event = WM_LBUTTONDOWN;
1142 case WebMouseEvent::ButtonMiddle:
1143 np_event->event = WM_MBUTTONDOWN;
1145 case WebMouseEvent::ButtonRight:
1146 np_event->event = WM_RBUTTONDOWN;
1150 case WebInputEvent::MouseUp:
1151 switch (event.button) {
1152 case WebMouseEvent::ButtonLeft:
1153 np_event->event = WM_LBUTTONUP;
1155 case WebMouseEvent::ButtonMiddle:
1156 np_event->event = WM_MBUTTONUP;
1158 case WebMouseEvent::ButtonRight:
1159 np_event->event = WM_RBUTTONUP;
1169 static bool NPEventFromWebKeyboardEvent(const WebKeyboardEvent& event,
1170 NPEvent* np_event) {
1171 np_event->wParam = event.windowsKeyCode;
1173 switch (event.type) {
1174 case WebInputEvent::KeyDown:
1175 np_event->event = WM_KEYDOWN;
1176 np_event->lParam = 0;
1178 case WebInputEvent::Char:
1179 np_event->event = WM_CHAR;
1180 np_event->lParam = 0;
1182 case WebInputEvent::KeyUp:
1183 np_event->event = WM_KEYUP;
1184 np_event->lParam = 0x8000;
1192 static bool NPEventFromWebInputEvent(const WebInputEvent& event,
1193 NPEvent* np_event) {
1194 switch (event.type) {
1195 case WebInputEvent::MouseMove:
1196 case WebInputEvent::MouseLeave:
1197 case WebInputEvent::MouseEnter:
1198 case WebInputEvent::MouseDown:
1199 case WebInputEvent::MouseUp:
1200 if (event.size < sizeof(WebMouseEvent)) {
1204 return NPEventFromWebMouseEvent(
1205 *static_cast<const WebMouseEvent*>(&event), np_event);
1206 case WebInputEvent::KeyDown:
1207 case WebInputEvent::Char:
1208 case WebInputEvent::KeyUp:
1209 if (event.size < sizeof(WebKeyboardEvent)) {
1213 return NPEventFromWebKeyboardEvent(
1214 *static_cast<const WebKeyboardEvent*>(&event), np_event);
1220 bool WebPluginDelegateImpl::PlatformHandleInputEvent(
1221 const WebInputEvent& event, WebCursor::CursorInfo* cursor_info) {
1222 DCHECK(cursor_info != NULL);
1225 if (!NPEventFromWebInputEvent(event, &np_event)) {
1229 // Allow this plug-in to access this IME emulator through IMM32 API while the
1230 // plug-in is processing this event.
1231 if (GetQuirks() & PLUGIN_QUIRK_EMULATE_IME) {
1233 plugin_ime_.reset(new WebPluginIMEWin);
1235 WebPluginIMEWin::ScopedLock lock(
1236 event.isKeyboardEventType(event.type) ? plugin_ime_.get() : NULL);
1238 HWND last_focus_window = NULL;
1240 if (ShouldTrackEventForModalLoops(&np_event)) {
1241 // A windowless plugin can enter a modal loop in a NPP_HandleEvent call.
1242 // For e.g. Flash puts up a context menu when we right click on the
1243 // windowless plugin area. We detect this by setting up a message filter
1244 // hook pror to calling NPP_HandleEvent on the plugin and unhook on
1245 // return from NPP_HandleEvent. If the plugin does enter a modal loop
1246 // in that context we unhook on receiving the first notification in
1247 // the message filter hook.
1248 handle_event_message_filter_hook_ =
1249 SetWindowsHookEx(WH_MSGFILTER, HandleEventMessageFilterHook, NULL,
1250 GetCurrentThreadId());
1251 // To ensure that the plugin receives keyboard events we set focus to the
1253 // TODO(iyengar) We need a framework in the renderer to identify which
1254 // windowless plugin is under the mouse and to handle this. This would
1255 // also require some changes in RenderWidgetHost to detect this in the
1256 // WM_MOUSEACTIVATE handler and inform the renderer accordingly.
1257 bool valid = GetParent(dummy_window_for_activation_) != GetDesktopWindow();
1259 last_focus_window = ::SetFocus(dummy_window_for_activation_);
1261 NOTREACHED() << "Dummy window not parented";
1265 bool old_task_reentrancy_state =
1266 base::MessageLoop::current()->NestableTasksAllowed();
1268 // Maintain a local/global stack for the g_current_plugin_instance variable
1269 // as this may be a nested invocation.
1270 WebPluginDelegateImpl* last_plugin_instance = g_current_plugin_instance;
1272 g_current_plugin_instance = this;
1274 handle_event_depth_++;
1276 bool popups_enabled = false;
1278 if (IsUserGestureMessage(np_event.event)) {
1279 instance()->PushPopupsEnabledState(true);
1280 popups_enabled = true;
1283 bool ret = instance()->NPP_HandleEvent(&np_event) != 0;
1285 if (popups_enabled) {
1286 instance()->PopPopupsEnabledState();
1289 // Flash and SilverLight always return false, even when they swallow the
1290 // event. Flash does this because it passes the event to its window proc,
1291 // which is supposed to return 0 if an event was handled. There are few
1292 // exceptions, such as IME, where it sometimes returns true.
1295 if (np_event.event == WM_MOUSEMOVE) {
1296 current_windowless_cursor_.InitFromExternalCursor(GetCursor());
1297 // Snag a reference to the current cursor ASAP in case the plugin modified
1298 // it. There is a nasty race condition here with the multiprocess browser
1299 // as someone might be setting the cursor in the main process as well.
1300 current_windowless_cursor_.GetCursorInfo(cursor_info);
1303 handle_event_depth_--;
1305 g_current_plugin_instance = last_plugin_instance;
1307 // We could have multiple NPP_HandleEvent calls nested together in case
1308 // the plugin enters a modal loop. Reset the pump messages event when
1309 // the outermost NPP_HandleEvent call unwinds.
1310 if (handle_event_depth_ == 0) {
1311 ResetEvent(handle_event_pump_messages_event_);
1314 if (::IsWindow(last_focus_window)) {
1315 // Restore the nestable tasks allowed state in the message loop and reset
1316 // the os modal loop state as the plugin returned from the TrackPopupMenu
1318 base::MessageLoop::current()->SetNestableTasksAllowed(
1319 old_task_reentrancy_state);
1320 base::MessageLoop::current()->set_os_modal_loop(false);
1321 // The Flash plugin at times sets focus to its hidden top level window
1322 // with class name SWFlash_PlaceholderX. This causes the chrome browser
1323 // window to receive a WM_ACTIVATEAPP message as a top level window from
1324 // another thread is now active. We end up in a state where the chrome
1325 // browser window is not active even though the user clicked on it.
1326 // Our workaround for this is to send over a raw
1327 // WM_LBUTTONDOWN/WM_LBUTTONUP combination to the last focus window, which
1329 if (dummy_window_for_activation_ != ::GetFocus()) {
1330 INPUT input_info = {0};
1331 input_info.type = INPUT_MOUSE;
1332 input_info.mi.dwFlags = MOUSEEVENTF_LEFTDOWN;
1333 ::SendInput(1, &input_info, sizeof(INPUT));
1335 input_info.type = INPUT_MOUSE;
1336 input_info.mi.dwFlags = MOUSEEVENTF_LEFTUP;
1337 ::SendInput(1, &input_info, sizeof(INPUT));
1339 ::SetFocus(last_focus_window);
1346 void WebPluginDelegateImpl::OnModalLoopEntered() {
1347 DCHECK(handle_event_pump_messages_event_ != NULL);
1348 SetEvent(handle_event_pump_messages_event_);
1350 base::MessageLoop::current()->SetNestableTasksAllowed(true);
1351 base::MessageLoop::current()->set_os_modal_loop(true);
1353 UnhookWindowsHookEx(handle_event_message_filter_hook_);
1354 handle_event_message_filter_hook_ = NULL;
1357 bool WebPluginDelegateImpl::ShouldTrackEventForModalLoops(NPEvent* event) {
1358 if (event->event == WM_RBUTTONDOWN)
1363 void WebPluginDelegateImpl::OnUserGestureEnd() {
1364 user_gesture_message_posted_ = false;
1365 instance()->PopPopupsEnabledState();
1368 BOOL WINAPI WebPluginDelegateImpl::TrackPopupMenuPatch(
1369 HMENU menu, unsigned int flags, int x, int y, int reserved,
1370 HWND window, const RECT* rect) {
1372 if (g_current_plugin_instance) {
1373 unsigned long window_process_id = 0;
1374 unsigned long window_thread_id =
1375 GetWindowThreadProcessId(window, &window_process_id);
1376 // TrackPopupMenu fails if the window passed in belongs to a different
1378 if (::GetCurrentThreadId() != window_thread_id) {
1380 GetParent(g_current_plugin_instance->dummy_window_for_activation_) !=
1383 window = g_current_plugin_instance->dummy_window_for_activation_;
1385 NOTREACHED() << "Dummy window not parented";
1390 BOOL result = TrackPopupMenu(menu, flags, x, y, reserved, window, rect);
1394 HCURSOR WINAPI WebPluginDelegateImpl::SetCursorPatch(HCURSOR cursor) {
1395 // The windowless flash plugin periodically calls SetCursor in a wndproc
1396 // instantiated on the plugin thread. This causes annoying cursor flicker
1397 // when the mouse is moved on a foreground tab, with a windowless plugin
1398 // instance in a background tab. We just ignore the call here.
1399 if (!g_current_plugin_instance) {
1400 HCURSOR current_cursor = GetCursor();
1401 if (current_cursor != cursor) {
1402 ::SetCursor(cursor);
1404 return current_cursor;
1406 return ::SetCursor(cursor);
1409 LONG WINAPI WebPluginDelegateImpl::RegEnumKeyExWPatch(
1410 HKEY key, DWORD index, LPWSTR name, LPDWORD name_size, LPDWORD reserved,
1411 LPWSTR class_name, LPDWORD class_size, PFILETIME last_write_time) {
1412 DWORD orig_size = *name_size;
1413 LONG rv = RegEnumKeyExW(key, index, name, name_size, reserved, class_name,
1414 class_size, last_write_time);
1415 if (rv == ERROR_SUCCESS &&
1416 GetKeyPath(key).find(L"Microsoft\\MediaPlayer\\ShimInclusionList") !=
1417 std::wstring::npos) {
1418 static const wchar_t kChromeExeName[] = L"chrome.exe";
1419 wcsncpy_s(name, orig_size, kChromeExeName, arraysize(kChromeExeName));
1421 std::min(orig_size, static_cast<DWORD>(arraysize(kChromeExeName)));
1427 void WebPluginDelegateImpl::ImeCompositionUpdated(
1428 const base::string16& text,
1429 const std::vector<int>& clauses,
1430 const std::vector<int>& target,
1431 int cursor_position) {
1433 plugin_ime_.reset(new WebPluginIMEWin);
1435 plugin_ime_->CompositionUpdated(text, clauses, target, cursor_position);
1436 plugin_ime_->SendEvents(instance());
1439 void WebPluginDelegateImpl::ImeCompositionCompleted(
1440 const base::string16& text) {
1442 plugin_ime_.reset(new WebPluginIMEWin);
1443 plugin_ime_->CompositionCompleted(text);
1444 plugin_ime_->SendEvents(instance());
1447 bool WebPluginDelegateImpl::GetIMEStatus(int* input_type,
1448 gfx::Rect* caret_rect) {
1451 return plugin_ime_->GetStatus(input_type, caret_rect);
1455 FARPROC WINAPI WebPluginDelegateImpl::GetProcAddressPatch(HMODULE module,
1457 FARPROC imm_function = WebPluginIMEWin::GetProcAddress(name);
1459 return imm_function;
1460 return ::GetProcAddress(module, name);
1463 void WebPluginDelegateImpl::HandleCaptureForMessage(HWND window,
1465 if (gfx::GetClassName(window) != base::string16(kNativeWindowClassName))
1469 case WM_LBUTTONDOWN:
1470 case WM_MBUTTONDOWN:
1471 case WM_RBUTTONDOWN:
1472 ::SetCapture(window);
1473 // As per documentation the WM_PARENTNOTIFY message is sent to the parent
1474 // window chain if mouse input is received by the child window. However
1475 // the parent receives the WM_PARENTNOTIFY message only if we doubleclick
1476 // on the window. We send the WM_PARENTNOTIFY message for mouse input
1477 // messages to the parent to indicate that user action is expected.
1478 ::SendMessage(::GetParent(window), WM_PARENTNOTIFY, message, 0);
1492 } // namespace content