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       focus_view_(NULL) {
  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   // If set_focus_view() has not been invoked, this view is the one that should
  38   // be seen as focused when the native view receives focus.
  39   if (!focus_view_)
  40     focus_view_ = this;
  41   native_wrapper_->AttachNativeView();
  42   Layout();
  43
  44   Widget* widget = Widget::GetWidgetForNativeView(native_view);
  45   if (widget)
  46     widget->SetNativeWindowProperty(kWidgetNativeViewHostKey, this);
  47 }
  48
  49 void NativeViewHost::Detach() {
  50   Detach(false);
  51 }
  52
  53 void NativeViewHost::SetPreferredSize(const gfx::Size& size) {
  54   preferred_size_ = size;
  55   PreferredSizeChanged();
  56 }
  57
  58 void NativeViewHost::NativeViewDestroyed() {
  59   // Detach so we can clear our state and notify the native_wrapper_ to release
  60   // ref on the native view.
  61   Detach(true);
  62 }
  63
  64 ////////////////////////////////////////////////////////////////////////////////
  65 // NativeViewHost, View overrides:
  66
  67 gfx::Size NativeViewHost::GetPreferredSize() const {
  68   return preferred_size_;
  69 }
  70
  71 void NativeViewHost::Layout() {
  72   if (!native_view_ || !native_wrapper_.get())
  73     return;
  74
  75   gfx::Rect vis_bounds = GetVisibleBounds();
  76   bool visible = !vis_bounds.IsEmpty();
  77
  78   if (visible && !fast_resize_) {
  79     if (vis_bounds.size() != size()) {
  80       // Only a portion of the Widget is really visible.
  81       int x = vis_bounds.x();
  82       int y = vis_bounds.y();
  83       native_wrapper_->InstallClip(x, y, vis_bounds.width(),
  84                                    vis_bounds.height());
  85     } else if (native_wrapper_->HasInstalledClip()) {
  86       // The whole widget is visible but we installed a clip on the widget,
  87       // uninstall it.
  88       native_wrapper_->UninstallClip();
  89     }
  90   }
  91
  92   if (visible) {
  93     // Since widgets know nothing about the View hierarchy (they are direct
  94     // children of the Widget that hosts our View hierarchy) they need to be
  95     // positioned in the coordinate system of the Widget, not the current
  96     // view.  Also, they should be positioned respecting the border insets
  97     // of the native view.
  98     gfx::Rect local_bounds = ConvertRectToWidget(GetContentsBounds());
  99     native_wrapper_->ShowWidget(local_bounds.x(), local_bounds.y(),
 100                                 local_bounds.width(),
 101                                 local_bounds.height());
 102   } else {
 103     native_wrapper_->HideWidget();
 104   }
 105   fast_resize_at_last_layout_ = visible && fast_resize_;
 106 }
 107
 108 void NativeViewHost::OnPaint(gfx::Canvas* canvas) {
 109   // Paint background if there is one. NativeViewHost needs to paint
 110   // a background when it is hosted in a TabbedPane. For Gtk implementation,
 111   // NativeTabbedPaneGtk uses a NativeWidgetGtk as page container and because
 112   // NativeWidgetGtk hook "expose" with its root view's paint, we need to
 113   // fill the content. Otherwise, the tab page's background is not properly
 114   // cleared. For Windows case, it appears okay to not paint background because
 115   // we don't have a container window in-between. However if you want to use
 116   // customized background, then this becomes necessary.
 117   OnPaintBackground(canvas);
 118
 119   // The area behind our window is black, so during a fast resize (where our
 120   // content doesn't draw over the full size of our native view, and the native
 121   // view background color doesn't show up), we need to cover that blackness
 122   // with something so that fast resizes don't result in black flash.
 123   //
 124   // It would be nice if this used some approximation of the page's
 125   // current background color.
 126   if (native_wrapper_->HasInstalledClip())
 127     canvas->FillRect(GetLocalBounds(), SK_ColorWHITE);
 128 }
 129
 130 void NativeViewHost::VisibilityChanged(View* starting_from, bool is_visible) {
 131   Layout();
 132 }
 133
 134 bool NativeViewHost::NeedsNotificationWhenVisibleBoundsChange() const {
 135   // The native widget is placed relative to the root. As such, we need to
 136   // know when the position of any ancestor changes, or our visibility relative
 137   // to other views changed as it'll effect our position relative to the root.
 138   return true;
 139 }
 140
 141 void NativeViewHost::OnVisibleBoundsChanged() {
 142   Layout();
 143 }
 144
 145 void NativeViewHost::ViewHierarchyChanged(
 146     const ViewHierarchyChangedDetails& details) {
 147   views::Widget* this_widget = GetWidget();
 148
 149   // A non-NULL |details.move_view| indicates a move operation i.e. |this| is
 150   // is being reparented.  If the previous and new parents belong to the same
 151   // widget, don't remove |this| from the widget.  This saves resources from
 152   // removing from widget and immediately followed by adding to widget; in
 153   // particular, there wouldn't be spurious visibilitychange events for web
 154   // contents of |WebView|.
 155   if (details.move_view && this_widget &&
 156       details.move_view->GetWidget() == this_widget) {
 157     return;
 158   }
 159
 160   if (details.is_add && this_widget) {
 161     if (!native_wrapper_.get())
 162       native_wrapper_.reset(NativeViewHostWrapper::CreateWrapper(this));
 163     native_wrapper_->AddedToWidget();
 164   } else if (!details.is_add) {
 165     native_wrapper_->RemovedFromWidget();
 166   }
 167 }
 168
 169 const char* NativeViewHost::GetClassName() const {
 170   return kViewClassName;
 171 }
 172
 173 void NativeViewHost::OnFocus() {
 174   native_wrapper_->SetFocus();
 175   NotifyAccessibilityEvent(ui::AX_EVENT_FOCUS, true);
 176 }
 177
 178 gfx::NativeViewAccessible NativeViewHost::GetNativeViewAccessible() {
 179   if (native_wrapper_.get()) {
 180     gfx::NativeViewAccessible accessible_view =
 181         native_wrapper_->GetNativeViewAccessible();
 182     if (accessible_view)
 183       return accessible_view;
 184   }
 185
 186   return View::GetNativeViewAccessible();
 187 }
 188
 189 gfx::NativeCursor NativeViewHost::GetCursor(const ui::MouseEvent& event) {
 190   return native_wrapper_->GetCursor(event.x(), event.y());
 191 }
 192
 193 ////////////////////////////////////////////////////////////////////////////////
 194 // NativeViewHost, private:
 195
 196 void NativeViewHost::Detach(bool destroyed) {
 197   if (native_view_) {
 198     if (!destroyed) {
 199       Widget* widget = Widget::GetWidgetForNativeView(native_view_);
 200       if (widget)
 201         widget->SetNativeWindowProperty(kWidgetNativeViewHostKey, NULL);
 202       ClearFocus();
 203     }
 204     native_wrapper_->NativeViewDetaching(destroyed);
 205     native_view_ = NULL;
 206   }
 207 }
 208
 209 void NativeViewHost::ClearFocus() {
 210   FocusManager* focus_manager = GetFocusManager();
 211   if (!focus_manager || !focus_manager->GetFocusedView())
 212     return;
 213
 214   Widget::Widgets widgets;
 215   Widget::GetAllChildWidgets(native_view(), &widgets);
 216   for (Widget::Widgets::iterator i = widgets.begin(); i != widgets.end(); ++i) {
 217     focus_manager->ViewRemoved((*i)->GetRootView());
 218     if (!focus_manager->GetFocusedView())
 219       return;
 220   }
 221 }
 222
 223 }  // namespace views