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
14namespace views {
15
16// static
17const char NativeViewHost::kViewClassName[] = "NativeViewHost";
18const char kWidgetNativeViewHostKey[] = "WidgetNativeViewHost";
19
20////////////////////////////////////////////////////////////////////////////////
21// NativeViewHost, public:
22
23NativeViewHost::NativeViewHost()
24    : native_view_(NULL),
25      fast_resize_(false),
26      fast_resize_at_last_layout_(false),
27      focus_view_(NULL) {
28}
29
30NativeViewHost::~NativeViewHost() {
31}
32
33void 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
49void NativeViewHost::Detach() {
50  Detach(false);
51}
52
53void NativeViewHost::SetPreferredSize(const gfx::Size& size) {
54  preferred_size_ = size;
55  PreferredSizeChanged();
56}
57
58void 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
67gfx::Size NativeViewHost::GetPreferredSize() const {
68  return preferred_size_;
69}
70
71void 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
108void 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
130void NativeViewHost::VisibilityChanged(View* starting_from, bool is_visible) {
131  Layout();
132}
133
134bool NativeViewHost::GetNeedsNotificationWhenVisibleBoundsChange() 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
141void NativeViewHost::OnVisibleBoundsChanged() {
142  Layout();
143}
144
145void 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
169const char* NativeViewHost::GetClassName() const {
170  return kViewClassName;
171}
172
173void NativeViewHost::OnFocus() {
174  native_wrapper_->SetFocus();
175  NotifyAccessibilityEvent(ui::AX_EVENT_FOCUS, true);
176}
177
178gfx::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
189gfx::NativeCursor NativeViewHost::GetCursor(const ui::MouseEvent& event) {
190  return native_wrapper_->GetCursor(event.x(), event.y());
191}
192
193////////////////////////////////////////////////////////////////////////////////
194// NativeViewHost, private:
195
196void 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
209void 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
224