src/ash/keyboard_overlay/keyboard_overlay_delegate.cc

   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.
   4
   5 #include "ash/keyboard_overlay/keyboard_overlay_delegate.h"
   6
   7 #include <algorithm>
   8
   9 #include "ash/shell.h"
  10 #include "base/bind.h"
  11 #include "base/memory/weak_ptr.h"
  12 #include "base/strings/utf_string_conversions.h"
  13 #include "base/values.h"
  14 #include "content/public/browser/web_ui.h"
  15 #include "content/public/browser/web_ui_message_handler.h"
  16 #include "ui/aura/window_event_dispatcher.h"
  17 #include "ui/gfx/screen.h"
  18 #include "ui/views/controls/webview/web_dialog_view.h"
  19 #include "ui/views/widget/widget.h"
  20
  21 using content::WebContents;
  22 using content::WebUIMessageHandler;
  23
  24 namespace {
  25
  26 const int kBaseWidth = 1252;
  27 const int kBaseHeight = 516;
  28 const int kHorizontalMargin = 28;
  29
  30 // A message handler for detecting the timing when the web contents is painted.
  31 class PaintMessageHandler
  32     : public WebUIMessageHandler,
  33       public base::SupportsWeakPtr<PaintMessageHandler> {
  34  public:
  35   explicit PaintMessageHandler(views::Widget* widget) : widget_(widget) {}
  36   virtual ~PaintMessageHandler() {}
  37
  38   // WebUIMessageHandler implementation.
  39   virtual void RegisterMessages() OVERRIDE;
  40
  41  private:
  42   void DidPaint(const base::ListValue* args);
  43
  44   views::Widget* widget_;
  45
  46   DISALLOW_COPY_AND_ASSIGN(PaintMessageHandler);
  47 };
  48
  49 void PaintMessageHandler::RegisterMessages() {
  50   web_ui()->RegisterMessageCallback(
  51       "didPaint",
  52       base::Bind(&PaintMessageHandler::DidPaint, AsWeakPtr()));
  53 }
  54
  55 void PaintMessageHandler::DidPaint(const base::ListValue* args) {
  56   // Show the widget after the web content has been painted.
  57   widget_->Show();
  58 }
  59
  60 }  // namespace
  61
  62 namespace ash {
  63
  64 KeyboardOverlayDelegate::KeyboardOverlayDelegate(const base::string16& title,
  65                                                  const GURL& url)
  66     : title_(title),
  67       url_(url),
  68       widget_(NULL) {
  69 }
  70
  71 KeyboardOverlayDelegate::~KeyboardOverlayDelegate() {
  72 }
  73
  74 views::Widget* KeyboardOverlayDelegate::Show(views::WebDialogView* view) {
  75   widget_ = new views::Widget;
  76   views::Widget::InitParams params(
  77       views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
  78   params.context = Shell::GetPrimaryRootWindow();
  79   params.delegate = view;
  80   widget_->Init(params);
  81
  82   // Show the widget at the bottom of the work area.
  83   gfx::Size size;
  84   GetDialogSize(&size);
  85   const gfx::Rect& rect = Shell::GetScreen()->GetDisplayNearestWindow(
  86       widget_->GetNativeView()).work_area();
  87   gfx::Rect bounds(rect.x() + (rect.width() - size.width()) / 2,
  88                    rect.bottom() - size.height(),
  89                    size.width(),
  90                    size.height());
  91   widget_->SetBounds(bounds);
  92
  93   // The widget will be shown when the web contents gets ready to display.
  94   return widget_;
  95 }
  96
  97 ui::ModalType KeyboardOverlayDelegate::GetDialogModalType() const {
  98   return ui::MODAL_TYPE_SYSTEM;
  99 }
 100
 101 base::string16 KeyboardOverlayDelegate::GetDialogTitle() const {
 102   return title_;
 103 }
 104
 105 GURL KeyboardOverlayDelegate::GetDialogContentURL() const {
 106   return url_;
 107 }
 108
 109 void KeyboardOverlayDelegate::GetWebUIMessageHandlers(
 110     std::vector<WebUIMessageHandler*>* handlers) const {
 111   handlers->push_back(new PaintMessageHandler(widget_));
 112 }
 113
 114 void KeyboardOverlayDelegate::GetDialogSize(
 115     gfx::Size* size) const {
 116   using std::min;
 117   DCHECK(widget_);
 118   gfx::Rect rect = ash::Shell::GetScreen()->GetDisplayNearestWindow(
 119       widget_->GetNativeView()).work_area();
 120   const int width = min(kBaseWidth, rect.width() - kHorizontalMargin);
 121   const int height = width * kBaseHeight / kBaseWidth;
 122   size->SetSize(width, height);
 123 }
 124
 125 std::string KeyboardOverlayDelegate::GetDialogArgs() const {
 126   return "[]";
 127 }
 128
 129 void KeyboardOverlayDelegate::OnDialogClosed(
 130     const std::string& json_retval) {
 131   delete this;
 132   return;
 133 }
 134
 135 void KeyboardOverlayDelegate::OnCloseContents(WebContents* source,
 136                                               bool* out_close_dialog) {
 137 }
 138
 139 bool KeyboardOverlayDelegate::ShouldShowDialogTitle() const {
 140   return false;
 141 }
 142
 143 bool KeyboardOverlayDelegate::HandleContextMenu(
 144     const content::ContextMenuParams& params) {
 145   return true;
 146 }
 147
 148 }  // namespace ash