ui/views/controls/webview/webview.h

   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 #ifndef UI_VIEWS_CONTROLS_WEBVIEW_WEBVIEW_H_
   6 #define UI_VIEWS_CONTROLS_WEBVIEW_WEBVIEW_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "content/public/browser/web_contents_delegate.h"
  11 #include "content/public/browser/web_contents_observer.h"
  12 #include "ui/views/accessibility/native_view_accessibility.h"
  13 #include "ui/views/controls/webview/webview_export.h"
  14 #include "ui/views/view.h"
  15
  16 namespace views {
  17
  18 class NativeViewHost;
  19
  20 // Provides a view of a WebContents instance.  WebView can be used standalone,
  21 // creating and displaying an internally-owned WebContents; or within a full
  22 // browser where the browser swaps its own WebContents instances in/out (e.g.,
  23 // for browser tabs).
  24 //
  25 // WebView creates and owns a single child view, a NativeViewHost, which will
  26 // hold and display the native view provided by a WebContents.
  27 //
  28 // EmbedFullscreenWidgetMode: When enabled, WebView will observe for WebContents
  29 // fullscreen changes and automatically swap the normal native view with the
  30 // fullscreen native view (if different).  In addition, if the WebContents is
  31 // being screen-captured, the view will be centered within WebView, sized to
  32 // the aspect ratio of the capture video resolution, and scaling will be avoided
  33 // whenever possible.
  34 class WEBVIEW_EXPORT WebView : public View,
  35                                public content::WebContentsDelegate,
  36                                public content::WebContentsObserver {
  37  public:
  38   static const char kViewClassName[];
  39
  40   explicit WebView(content::BrowserContext* browser_context);
  41   ~WebView() override;
  42
  43   // This creates a WebContents if none is yet associated with this WebView. The
  44   // WebView owns this implicitly created WebContents.
  45   content::WebContents* GetWebContents();
  46
  47   // WebView does not assume ownership of WebContents set via this method, only
  48   // those it implicitly creates via GetWebContents() above.
  49   void SetWebContents(content::WebContents* web_contents);
  50
  51   // If |mode| is true, WebView will register itself with WebContents as a
  52   // WebContentsObserver, monitor for the showing/destruction of fullscreen
  53   // render widgets, and alter its child view hierarchy to embed the fullscreen
  54   // widget or restore the normal WebContentsView.
  55   void SetEmbedFullscreenWidgetMode(bool mode);
  56
  57   content::BrowserContext* browser_context() { return browser_context_; }
  58
  59   // Loads the initial URL to display in the attached WebContents. Creates the
  60   // WebContents if none is attached yet. Note that this is intended as a
  61   // convenience for loading the initial URL, and so URLs are navigated with
  62   // PAGE_TRANSITION_AUTO_TOPLEVEL, so this is not intended as a general purpose
  63   // navigation method - use WebContents' API directly.
  64   void LoadInitialURL(const GURL& url);
  65
  66   // Controls how the attached WebContents is resized.
  67   // false = WebContents' views' bounds are updated continuously as the
  68   //         WebView's bounds change (default).
  69   // true  = WebContents' views' position is updated continuously but its size
  70   //         is not (which may result in some clipping or under-painting) until
  71   //         a continuous size operation completes. This allows for smoother
  72   //         resizing performance during interactive resizes and animations.
  73   void SetFastResize(bool fast_resize);
  74
  75   // Called when the WebContents is focused.
  76   // TODO(beng): This view should become a WebContentsViewObserver when a
  77   //             WebContents is attached, and not rely on the delegate to
  78   //             forward this notification.
  79   void OnWebContentsFocused(content::WebContents* web_contents);
  80
  81   // When used to host UI, we need to explicitly allow accelerators to be
  82   // processed. Default is false.
  83   void set_allow_accelerators(bool allow_accelerators) {
  84     allow_accelerators_ = allow_accelerators;
  85   }
  86
  87   // Sets the preferred size. If empty, View's implementation of
  88   // GetPreferredSize() is used.
  89   void SetPreferredSize(const gfx::Size& preferred_size);
  90
  91   // Overridden from View:
  92   const char* GetClassName() const override;
  93   ui::TextInputClient* GetTextInputClient() override;
  94
  95  protected:
  96   // Swaps the owned WebContents |wc_owner_| with |new_web_contents|. Returns
  97   // the previously owned WebContents.
  98   scoped_ptr<content::WebContents> SwapWebContents(
  99       scoped_ptr<content::WebContents> new_web_contents);
 100
 101   // Overridden from View:
 102   void OnBoundsChanged(const gfx::Rect& previous_bounds) override;
 103   void ViewHierarchyChanged(
 104       const ViewHierarchyChangedDetails& details) override;
 105   bool SkipDefaultKeyEventProcessing(const ui::KeyEvent& event) override;
 106   void OnFocus() override;
 107   void AboutToRequestFocusFromTabTraversal(bool reverse) override;
 108   void GetAccessibleState(ui::AXViewState* state) override;
 109   gfx::NativeViewAccessible GetNativeViewAccessible() override;
 110   gfx::Size GetPreferredSize() const override;
 111
 112   // Overridden from content::WebContentsDelegate:
 113   void WebContentsFocused(content::WebContents* web_contents) override;
 114   bool EmbedsFullscreenWidget() const override;
 115
 116   // Overridden from content::WebContentsObserver:
 117   void RenderViewDeleted(content::RenderViewHost* render_view_host) override;
 118   void RenderProcessGone(base::TerminationStatus status) override;
 119   void RenderViewHostChanged(content::RenderViewHost* old_host,
 120                              content::RenderViewHost* new_host) override;
 121   void DidShowFullscreenWidget(int routing_id) override;
 122   void DidDestroyFullscreenWidget(int routing_id) override;
 123   void DidToggleFullscreenModeForTab(bool entered_fullscreen) override;
 124   void DidAttachInterstitialPage() override;
 125   void DidDetachInterstitialPage() override;
 126   // Workaround for MSVC++ linker bug/feature that requires
 127   // instantiation of the inline IPC::Listener methods in all translation units.
 128   void OnChannelConnected(int32 peer_id) override {}
 129   void OnChannelError() override {}
 130   void OnBadMessageReceived(const IPC::Message& message) override {}
 131
 132  private:
 133   void AttachWebContents();
 134   void DetachWebContents();
 135   void ReattachForFullscreenChange(bool enter_fullscreen);
 136   void NotifyMaybeTextInputClientChanged();
 137
 138   // Create a regular or test web contents (based on whether we're running
 139   // in a unit test or not).
 140   content::WebContents* CreateWebContents(
 141       content::BrowserContext* browser_context);
 142
 143   NativeViewHost* const holder_;
 144   // Non-NULL if |web_contents()| was created and is owned by this WebView.
 145   scoped_ptr<content::WebContents> wc_owner_;
 146   // When true, WebView auto-embeds fullscreen widgets as a child view.
 147   bool embed_fullscreen_widget_mode_enabled_;
 148   // Set to true while WebView is embedding a fullscreen widget view as a child
 149   // view instead of the normal WebContentsView render view. Note: This will be
 150   // false in the case of non-Flash fullscreen.
 151   bool is_embedding_fullscreen_widget_;
 152   content::BrowserContext* browser_context_;
 153   bool allow_accelerators_;
 154   gfx::Size preferred_size_;
 155
 156   DISALLOW_COPY_AND_ASSIGN(WebView);
 157 };
 158
 159 }  // namespace views
 160
 161 #endif  // UI_VIEWS_CONTROLS_WEBVIEW_WEBVIEW_H_