ui/views/controls/native/native_view_host.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 "ui/views/controls/native/native_view_host.h"
   6
   7 #include "base/logging.h"
   8 #include "ui/base/cursor/cursor.h"
   9 #include "ui/gfx/canvas.h"
  10 #include "ui/views/accessibility/native_view_accessibility.h"
  11 #include "ui/views/controls/native/native_view_host_wrapper.h"
  12 #include "ui/views/widget/widget.h"
  13
  14 namespace views {
  15
  16 // static
  17 const char NativeViewHost::kViewClassName[] = "NativeViewHost";
  18 const char kWidgetNativeViewHostKey[] = "WidgetNativeViewHost";
  19
  20 ////////////////////////////////////////////////////////////////////////////////
  21 // NativeViewHost, public:
  22
  23 NativeViewHost::NativeViewHost()
  24     : native_view_(NULL),
  25       fast_resize_(false),
  26       fast_resize_at_last_layout_(false),
  27       resize_background_color_(SK_ColorWHITE) {
  28 }
  29
  30 NativeViewHost::~NativeViewHost() {
  31 }
  32
  33 void NativeViewHost::Attach(gfx::NativeView native_view) {
  34   DCHECK(native_view);
  35   DCHECK(!native_view_);
  36   native_view_ = native_view;
  37   native_wrapper_->AttachNativeView();
  38   Layout();
  39
  40   Widget* widget = Widget::GetWidgetForNativeView(native_view);
  41   if (widget)
  42     widget->SetNativeWindowProperty(kWidgetNativeViewHostKey, this);
  43 }
  44
  45 void NativeViewHost::Detach() {
  46   Detach(false);
  47 }
  48
  49 void NativeViewHost::SetPreferredSize(const gfx::Size& size) {
  50   preferred_size_ = size;
  51   PreferredSizeChanged();
  52 }
  53
  54 void NativeViewHost::NativeViewDestroyed() {
  55   // Detach so we can clear our state and notify the native_wrapper_ to release
  56   // ref on the native view.
  57   Detach(true);
  58 }
  59
  60 ////////////////////////////////////////////////////////////////////////////////
  61 // NativeViewHost, View overrides:
  62
  63 gfx::Size NativeViewHost::GetPreferredSize() const {
  64   return preferred_size_;
  65 }
  66
  67 void NativeViewHost::Layout() {
  68   if (!native_view_ || !native_wrapper_.get())
  69     return;
  70
  71   gfx::Rect vis_bounds = GetVisibleBounds();
  72   bool visible = !vis_bounds.IsEmpty();
  73
  74   if (visible && !fast_resize_) {
  75     if (vis_bounds.size() != size()) {
  76       // Only a portion of the Widget is really visible.
  77       int x = vis_bounds.x();
  78       int y = vis_bounds.y();
  79       native_wrapper_->InstallClip(x, y, vis_bounds.width(),
  80                                    vis_bounds.height());
  81     } else if (native_wrapper_->HasInstalledClip()) {
  82       // The whole widget is visible but we installed a clip on the widget,
  83       // uninstall it.
  84       native_wrapper_->UninstallClip();
  85     }
  86   }
  87
  88   if (visible) {
  89     // Since widgets know nothing about the View hierarchy (they are direct
  90     // children of the Widget that hosts our View hierarchy) they need to be
  91     // positioned in the coordinate system of the Widget, not the current
  92     // view.  Also, they should be positioned respecting the border insets
  93     // of the native view.
  94     gfx::Rect local_bounds = ConvertRectToWidget(GetContentsBounds());
  95     native_wrapper_->ShowWidget(local_bounds.x(), local_bounds.y(),
  96                                 local_bounds.width(),
  97                                 local_bounds.height());
  98   } else {
  99     native_wrapper_->HideWidget();
 100   }
 101   fast_resize_at_last_layout_ = visible && fast_resize_;
 102 }
 103
 104 void NativeViewHost::OnPaint(gfx::Canvas* canvas) {
 105   // Paint background if there is one. NativeViewHost needs to paint
 106   // a background when it is hosted in a TabbedPane. For Gtk implementation,
 107   // NativeTabbedPaneGtk uses a NativeWidgetGtk as page container and because
 108   // NativeWidgetGtk hook "expose" with its root view's paint, we need to
 109   // fill the content. Otherwise, the tab page's background is not properly
 110   // cleared. For Windows case, it appears okay to not paint background because
 111   // we don't have a container window in-between. However if you want to use
 112   // customized background, then this becomes necessary.
 113   OnPaintBackground(canvas);
 114
 115   // The area behind our window is black, so during a fast resize (where our
 116   // content doesn't draw over the full size of our native view, and the native
 117   // view background color doesn't show up), we need to cover that blackness
 118   // with something so that fast resizes don't result in black flash.
 119   //
 120   // It would be nice if this used some approximation of the page's
 121   // current background color.
 122   if (native_wrapper_->HasInstalledClip())
 123     canvas->FillRect(GetLocalBounds(), resize_background_color_);
 124 }
 125
 126 void NativeViewHost::VisibilityChanged(View* starting_from, bool is_visible) {
 127   Layout();
 128 }
 129
 130 bool NativeViewHost::GetNeedsNotificationWhenVisibleBoundsChange() const {
 131   // The native widget is placed relative to the root. As such, we need to
 132   // know when the position of any ancestor changes, or our visibility relative
 133   // to other views changed as it'll effect our position relative to the root.
 134   return true;
 135 }
 136
 137 void NativeViewHost::OnVisibleBoundsChanged() {
 138   Layout();
 139 }
 140
 141 void NativeViewHost::ViewHierarchyChanged(
 142     const ViewHierarchyChangedDetails& details) {
 143   views::Widget* this_widget = GetWidget();
 144
 145   // A non-NULL |details.move_view| indicates a move operation i.e. |this| is
 146   // is being reparented.  If the previous and new parents belong to the same
 147   // widget, don't remove |this| from the widget.  This saves resources from
 148   // removing from widget and immediately followed by adding to widget; in
 149   // particular, there wouldn't be spurious visibilitychange events for web
 150   // contents of |WebView|.
 151   if (details.move_view && this_widget &&
 152       details.move_view->GetWidget() == this_widget) {
 153     return;
 154   }
 155
 156   if (details.is_add && this_widget) {
 157     if (!native_wrapper_.get())
 158       native_wrapper_.reset(NativeViewHostWrapper::CreateWrapper(this));
 159     native_wrapper_->AddedToWidget();
 160   } else if (!details.is_add) {
 161     native_wrapper_->RemovedFromWidget();
 162   }
 163 }
 164
 165 const char* NativeViewHost::GetClassName() const {
 166   return kViewClassName;
 167 }
 168
 169 void NativeViewHost::OnFocus() {
 170   native_wrapper_->SetFocus();
 171   NotifyAccessibilityEvent(ui::AX_EVENT_FOCUS, true);
 172 }
 173
 174 gfx::NativeViewAccessible NativeViewHost::GetNativeViewAccessible() {
 175   if (native_wrapper_.get()) {
 176     gfx::NativeViewAccessible accessible_view =
 177         native_wrapper_->GetNativeViewAccessible();
 178     if (accessible_view)
 179       return accessible_view;
 180   }
 181
 182   return View::GetNativeViewAccessible();
 183 }
 184
 185 gfx::NativeCursor NativeViewHost::GetCursor(const ui::MouseEvent& event) {
 186   return native_wrapper_->GetCursor(event.x(), event.y());
 187 }
 188
 189 ////////////////////////////////////////////////////////////////////////////////
 190 // NativeViewHost, private:
 191
 192 void NativeViewHost::Detach(bool destroyed) {
 193   if (native_view_) {
 194     if (!destroyed) {
 195       Widget* widget = Widget::GetWidgetForNativeView(native_view_);
 196       if (widget)
 197         widget->SetNativeWindowProperty(kWidgetNativeViewHostKey, NULL);
 198       ClearFocus();
 199     }
 200     native_wrapper_->NativeViewDetaching(destroyed);
 201     native_view_ = NULL;
 202   }
 203 }
 204
 205 void NativeViewHost::ClearFocus() {
 206   FocusManager* focus_manager = GetFocusManager();
 207   if (!focus_manager || !focus_manager->GetFocusedView())
 208     return;
 209
 210   Widget::Widgets widgets;
 211   Widget::GetAllChildWidgets(native_view(), &widgets);
 212   for (Widget::Widgets::iterator i = widgets.begin(); i != widgets.end(); ++i) {
 213     focus_manager->ViewRemoved((*i)->GetRootView());
 214     if (!focus_manager->GetFocusedView())
 215       return;
 216   }
 217 }
 218
 219 }  // namespace views