src/components/constrained_window/constrained_window_views.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 "components/constrained_window/constrained_window_views.h"
   6
   7 #include <algorithm>
   8
   9 #include "components/constrained_window/constrained_window_views_client.h"
  10 #include "components/web_modal/popup_manager.h"
  11 #include "components/web_modal/web_contents_modal_dialog_host.h"
  12 #include "ui/views/border.h"
  13 #include "ui/views/widget/widget.h"
  14 #include "ui/views/widget/widget_observer.h"
  15 #include "ui/views/window/dialog_delegate.h"
  16
  17 using web_modal::ModalDialogHost;
  18 using web_modal::ModalDialogHostObserver;
  19
  20 namespace {
  21
  22 ConstrainedWindowViewsClient* constrained_window_views_client = NULL;
  23
  24 // The name of a key to store on the window handle to associate
  25 // WidgetModalDialogHostObserverViews with the Widget.
  26 const char* const kWidgetModalDialogHostObserverViewsKey =
  27     "__WIDGET_MODAL_DIALOG_HOST_OBSERVER_VIEWS__";
  28
  29 // Applies positioning changes from the ModalDialogHost to the Widget.
  30 class WidgetModalDialogHostObserverViews
  31     : public views::WidgetObserver,
  32       public ModalDialogHostObserver {
  33  public:
  34   WidgetModalDialogHostObserverViews(ModalDialogHost* host,
  35                                      views::Widget* target_widget,
  36                                      const char *const native_window_property)
  37       : host_(host),
  38         target_widget_(target_widget),
  39         native_window_property_(native_window_property) {
  40     DCHECK(host_);
  41     DCHECK(target_widget_);
  42     host_->AddObserver(this);
  43     target_widget_->AddObserver(this);
  44   }
  45
  46   ~WidgetModalDialogHostObserverViews() override {
  47     if (host_)
  48       host_->RemoveObserver(this);
  49     target_widget_->RemoveObserver(this);
  50     target_widget_->SetNativeWindowProperty(native_window_property_, NULL);
  51   }
  52
  53   // WidgetObserver overrides
  54   void OnWidgetClosing(views::Widget* widget) override { delete this; }
  55
  56   // WebContentsModalDialogHostObserver overrides
  57   void OnPositionRequiresUpdate() override {
  58     UpdateWidgetModalDialogPosition(target_widget_, host_);
  59   }
  60
  61   void OnHostDestroying() override {
  62     host_->RemoveObserver(this);
  63     host_ = NULL;
  64   }
  65
  66  private:
  67   ModalDialogHost* host_;
  68   views::Widget* target_widget_;
  69   const char* const native_window_property_;
  70
  71   DISALLOW_COPY_AND_ASSIGN(WidgetModalDialogHostObserverViews);
  72 };
  73
  74 void UpdateModalDialogPosition(views::Widget* widget,
  75                                web_modal::ModalDialogHost* dialog_host,
  76                                const gfx::Size& size) {
  77   // Do not forcibly update the dialog widget position if it is being dragged.
  78   if (widget->HasCapture())
  79     return;
  80
  81   gfx::Point position = dialog_host->GetDialogPosition(size);
  82   views::Border* border = widget->non_client_view()->frame_view()->border();
  83   // Border may be null during widget initialization.
  84   if (border) {
  85     // Align the first row of pixels inside the border. This is the apparent
  86     // top of the dialog.
  87     position.set_y(position.y() - border->GetInsets().top());
  88   }
  89
  90   if (widget->is_top_level()) {
  91     position +=
  92         views::Widget::GetWidgetForNativeView(dialog_host->GetHostView())->
  93             GetClientAreaBoundsInScreen().OffsetFromOrigin();
  94   }
  95
  96   widget->SetBounds(gfx::Rect(position, size));
  97 }
  98
  99 }  // namespace
 100
 101 // static
 102 void SetConstrainedWindowViewsClient(
 103     scoped_ptr<ConstrainedWindowViewsClient> new_client) {
 104   delete constrained_window_views_client;
 105   constrained_window_views_client = new_client.release();
 106 }
 107
 108 void UpdateWebContentsModalDialogPosition(
 109     views::Widget* widget,
 110     web_modal::WebContentsModalDialogHost* dialog_host) {
 111   gfx::Size size = widget->GetRootView()->GetPreferredSize();
 112   gfx::Size max_size = dialog_host->GetMaximumDialogSize();
 113   // Enlarge the max size by the top border, as the dialog will be shifted
 114   // outside the area specified by the dialog host by this amount later.
 115   views::Border* border =
 116       widget->non_client_view()->frame_view()->border();
 117   // Border may be null during widget initialization.
 118   if (border)
 119     max_size.Enlarge(0, border->GetInsets().top());
 120   size.SetToMin(max_size);
 121   UpdateModalDialogPosition(widget, dialog_host, size);
 122 }
 123
 124 void UpdateWidgetModalDialogPosition(views::Widget* widget,
 125                                      web_modal::ModalDialogHost* dialog_host) {
 126   UpdateModalDialogPosition(widget, dialog_host,
 127                             widget->GetRootView()->GetPreferredSize());
 128 }
 129
 130 views::Widget* ShowWebModalDialogViews(
 131     views::WidgetDelegate* dialog,
 132     content::WebContents* initiator_web_contents) {
 133   DCHECK(constrained_window_views_client);
 134   // For embedded WebContents, use the embedder's WebContents for constrained
 135   // window.
 136   content::WebContents* web_contents = constrained_window_views_client->
 137       GetEmbedderWebContents(initiator_web_contents);
 138   views::Widget* widget = CreateWebModalDialogViews(dialog, web_contents);
 139   web_modal::PopupManager* popup_manager =
 140       web_modal::PopupManager::FromWebContents(web_contents);
 141   popup_manager->ShowModalDialog(widget->GetNativeWindow(), web_contents);
 142   return widget;
 143 }
 144
 145 views::Widget* CreateWebModalDialogViews(views::WidgetDelegate* dialog,
 146                                          content::WebContents* web_contents) {
 147   DCHECK_EQ(ui::MODAL_TYPE_CHILD, dialog->GetModalType());
 148   web_modal::PopupManager* popup_manager =
 149       web_modal::PopupManager::FromWebContents(web_contents);
 150   const gfx::NativeView parent = popup_manager->GetHostView();
 151   return views::DialogDelegate::CreateDialogWidget(dialog, NULL, parent);
 152 }
 153
 154 // TODO(gbillock): Replace this with PopupManager calls.
 155 views::Widget* CreateBrowserModalDialogViews(views::DialogDelegate* dialog,
 156                                              gfx::NativeView parent) {
 157   DCHECK_NE(ui::MODAL_TYPE_CHILD, dialog->GetModalType());
 158   DCHECK_NE(ui::MODAL_TYPE_NONE, dialog->GetModalType());
 159
 160   views::Widget* widget =
 161       views::DialogDelegate::CreateDialogWidget(dialog, NULL, parent);
 162   if (!dialog->UseNewStyleForThisDialog())
 163     return widget;
 164   DCHECK(constrained_window_views_client);
 165   ModalDialogHost* host = constrained_window_views_client->
 166       GetModalDialogHost(parent);
 167   if (host) {
 168     DCHECK_EQ(parent, host->GetHostView());
 169     ModalDialogHostObserver* dialog_host_observer =
 170         new WidgetModalDialogHostObserverViews(
 171             host, widget, kWidgetModalDialogHostObserverViewsKey);
 172     dialog_host_observer->OnPositionRequiresUpdate();
 173   }
 174   return widget;
 175 }