chrome/browser/ui/views/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 "chrome/browser/ui/views/constrained_window_views.h"
   6
   7 #include <algorithm>
   8
   9 #include "chrome/browser/ui/browser_finder.h"
  10 #include "components/web_modal/web_contents_modal_dialog_host.h"
  11 #include "ui/views/border.h"
  12 #include "ui/views/widget/widget.h"
  13 #include "ui/views/widget/widget_observer.h"
  14 #include "ui/views/window/dialog_delegate.h"
  15
  16 using web_modal::ModalDialogHost;
  17 using web_modal::ModalDialogHostObserver;
  18
  19 namespace {
  20 // The name of a key to store on the window handle to associate
  21 // BrowserModalDialogHostObserverViews with the Widget.
  22 const char* const kBrowserModalDialogHostObserverViewsKey =
  23     "__BROWSER_MODAL_DIALOG_HOST_OBSERVER_VIEWS__";
  24
  25 // Applies positioning changes from the ModalDialogHost to the Widget.
  26 class BrowserModalDialogHostObserverViews
  27     : public views::WidgetObserver,
  28       public ModalDialogHostObserver {
  29  public:
  30   BrowserModalDialogHostObserverViews(ModalDialogHost* host,
  31                                       views::Widget* target_widget,
  32                                       const char *const native_window_property)
  33       : host_(host),
  34         target_widget_(target_widget),
  35         native_window_property_(native_window_property) {
  36     DCHECK(host_);
  37     DCHECK(target_widget_);
  38     host_->AddObserver(this);
  39     target_widget_->AddObserver(this);
  40   }
  41
  42   virtual ~BrowserModalDialogHostObserverViews() {
  43     if (host_)
  44       host_->RemoveObserver(this);
  45     target_widget_->RemoveObserver(this);
  46     target_widget_->SetNativeWindowProperty(native_window_property_, NULL);
  47   }
  48
  49   // WidgetObserver overrides
  50   virtual void OnWidgetClosing(views::Widget* widget) OVERRIDE {
  51     delete this;
  52   }
  53
  54   // WebContentsModalDialogHostObserver overrides
  55   virtual void OnPositionRequiresUpdate() OVERRIDE {
  56     UpdateBrowserModalDialogPosition(target_widget_, host_);
  57   }
  58
  59   virtual void OnHostDestroying() OVERRIDE {
  60     host_->RemoveObserver(this);
  61     host_ = NULL;
  62   }
  63
  64  private:
  65   ModalDialogHost* host_;
  66   views::Widget* target_widget_;
  67   const char* const native_window_property_;
  68
  69   DISALLOW_COPY_AND_ASSIGN(BrowserModalDialogHostObserverViews);
  70 };
  71
  72 void UpdateModalDialogPosition(views::Widget* widget,
  73                                web_modal::ModalDialogHost* dialog_host,
  74                                const gfx::Size& size) {
  75   // Do not forcibly update the dialog widget position if it is being dragged.
  76   if (widget->HasCapture())
  77     return;
  78
  79   gfx::Point position = dialog_host->GetDialogPosition(size);
  80   views::Border* border = widget->non_client_view()->frame_view()->border();
  81   // Border may be null during widget initialization.
  82   if (border) {
  83     // Align the first row of pixels inside the border. This is the apparent
  84     // top of the dialog.
  85     position.set_y(position.y() - border->GetInsets().top());
  86   }
  87
  88   if (widget->is_top_level()) {
  89     position +=
  90         views::Widget::GetWidgetForNativeView(dialog_host->GetHostView())->
  91             GetClientAreaBoundsInScreen().OffsetFromOrigin();
  92   }
  93
  94   widget->SetBounds(gfx::Rect(position, size));
  95 }
  96
  97 }  // namespace
  98
  99 void UpdateWebContentsModalDialogPosition(
 100     views::Widget* widget,
 101     web_modal::WebContentsModalDialogHost* dialog_host) {
 102   gfx::Size size = widget->GetRootView()->GetPreferredSize();
 103   gfx::Size max_size = dialog_host->GetMaximumDialogSize();
 104   // Enlarge the max size by the top border, as the dialog will be shifted
 105   // outside the area specified by the dialog host by this amount later.
 106   views::Border* border =
 107       widget->non_client_view()->frame_view()->border();
 108   // Border may be null during widget initialization.
 109   if (border)
 110     max_size.Enlarge(0, border->GetInsets().top());
 111   size.SetToMin(max_size);
 112   UpdateModalDialogPosition(widget, dialog_host, size);
 113 }
 114
 115 void UpdateBrowserModalDialogPosition(views::Widget* widget,
 116                                       web_modal::ModalDialogHost* dialog_host) {
 117   UpdateModalDialogPosition(widget, dialog_host,
 118                             widget->GetRootView()->GetPreferredSize());
 119 }
 120
 121 views::Widget* CreateBrowserModalDialogViews(views::DialogDelegate* dialog,
 122                                              gfx::NativeWindow parent) {
 123   views::Widget* widget =
 124       views::DialogDelegate::CreateDialogWidget(dialog, NULL, parent);
 125   if (!dialog->UseNewStyleForThisDialog())
 126     return widget;
 127
 128   // Get the browser dialog management and hosting components from |parent|.
 129   Browser* browser = chrome::FindBrowserWithWindow(parent);
 130   if (browser) {
 131     ChromeWebModalDialogManagerDelegate* manager = browser;
 132     ModalDialogHost* host = manager->GetWebContentsModalDialogHost();
 133     DCHECK_EQ(parent, host->GetHostView());
 134     ModalDialogHostObserver* dialog_host_observer =
 135         new BrowserModalDialogHostObserverViews(
 136             host, widget, kBrowserModalDialogHostObserverViewsKey);
 137     dialog_host_observer->OnPositionRequiresUpdate();
 138   }
 139   return widget;
 140 }