ui/views/views_delegate.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_VIEWS_DELEGATE_H_
   6 #define UI_VIEWS_VIEWS_DELEGATE_H_
   7
   8 #include <string>
   9
  10 #if defined(OS_WIN)
  11 #include <windows.h>
  12 #endif
  13
  14 #include "base/strings/string16.h"
  15 #include "ui/accessibility/ax_enums.h"
  16 #include "ui/base/ui_base_types.h"
  17 #include "ui/gfx/native_widget_types.h"
  18 #include "ui/views/views_export.h"
  19 #include "ui/views/widget/widget.h"
  20
  21 namespace base {
  22 class TimeDelta;
  23 }
  24
  25 namespace content {
  26 class WebContents;
  27 class BrowserContext;
  28 class SiteInstance;
  29 }
  30
  31 namespace gfx {
  32 class ImageSkia;
  33 class Rect;
  34 }
  35
  36 namespace ui {
  37 class ContextFactory;
  38 }
  39
  40 namespace views {
  41
  42 class NativeWidget;
  43 class NonClientFrameView;
  44 class ViewsTouchSelectionControllerFactory;
  45 class View;
  46 class Widget;
  47 namespace internal {
  48 class NativeWidgetDelegate;
  49 }
  50
  51 // ViewsDelegate is an interface implemented by an object using the views
  52 // framework. It is used to obtain various high level application utilities
  53 // and perform some actions such as window placement saving.
  54 //
  55 // The embedding app must set views_delegate to assign its ViewsDelegate
  56 // implementation.
  57 class VIEWS_EXPORT ViewsDelegate {
  58  public:
  59 #if defined(OS_WIN)
  60   enum AppbarAutohideEdge {
  61     EDGE_TOP    = 1 << 0,
  62     EDGE_LEFT   = 1 << 1,
  63     EDGE_BOTTOM = 1 << 2,
  64     EDGE_RIGHT  = 1 << 3,
  65   };
  66 #endif
  67
  68   ViewsDelegate();
  69   virtual ~ViewsDelegate();
  70
  71   // Saves the position, size and "show" state for the window with the
  72   // specified name.
  73   virtual void SaveWindowPlacement(const Widget* widget,
  74                                    const std::string& window_name,
  75                                    const gfx::Rect& bounds,
  76                                    ui::WindowShowState show_state);
  77
  78   // Retrieves the saved position and size and "show" state for the window with
  79   // the specified name.
  80   virtual bool GetSavedWindowPlacement(const Widget* widget,
  81                                        const std::string& window_name,
  82                                        gfx::Rect* bounds,
  83                                        ui::WindowShowState* show_state) const;
  84
  85   virtual void NotifyAccessibilityEvent(View* view, ui::AXEvent event_type);
  86
  87   // For accessibility, notify the delegate that a menu item was focused
  88   // so that alternate feedback (speech / magnified text) can be provided.
  89   virtual void NotifyMenuItemFocused(const base::string16& menu_name,
  90                                      const base::string16& menu_item_name,
  91                                      int item_index,
  92                                      int item_count,
  93                                      bool has_submenu);
  94
  95 #if defined(OS_WIN)
  96   // Retrieves the default window icon to use for windows if none is specified.
  97   virtual HICON GetDefaultWindowIcon() const;
  98   // Returns true if the window passed in is in the Windows 8 metro
  99   // environment.
 100   virtual bool IsWindowInMetro(gfx::NativeWindow window) const;
 101 #elif defined(OS_LINUX) && !defined(OS_CHROMEOS)
 102   virtual gfx::ImageSkia* GetDefaultWindowIcon() const;
 103 #endif
 104
 105   // Creates a default NonClientFrameView to be used for windows that don't
 106   // specify their own. If this function returns NULL, the
 107   // views::CustomFrameView type will be used.
 108   virtual NonClientFrameView* CreateDefaultNonClientFrameView(Widget* widget);
 109
 110   // AddRef/ReleaseRef are invoked while a menu is visible. They are used to
 111   // ensure we don't attempt to exit while a menu is showing.
 112   virtual void AddRef();
 113   virtual void ReleaseRef();
 114
 115   // Creates a web contents. This will return NULL unless overriden.
 116   virtual content::WebContents* CreateWebContents(
 117       content::BrowserContext* browser_context,
 118       content::SiteInstance* site_instance);
 119
 120   // Gives the platform a chance to modify the properties of a Widget.
 121   virtual void OnBeforeWidgetInit(Widget::InitParams* params,
 122                                   internal::NativeWidgetDelegate* delegate) = 0;
 123
 124   // Returns the default obscured text reveal duration.
 125   virtual base::TimeDelta GetDefaultTextfieldObscuredRevealDuration();
 126
 127   // Returns true if the operating system's window manager will always provide a
 128   // title bar with caption buttons (ignoring the setting to
 129   // |remove_standard_frame| in InitParams). If |maximized|, this applies to
 130   // maximized windows; otherwise to restored windows.
 131   virtual bool WindowManagerProvidesTitleBar(bool maximized);
 132
 133 #if defined(USE_AURA)
 134   // Returns the context factory for new windows.
 135   virtual ui::ContextFactory* GetContextFactory();
 136 #endif
 137
 138 #if defined(OS_WIN)
 139   // Starts a query for the appbar autohide edges of the specified monitor and
 140   // returns the current value.  If the query finds the edges have changed from
 141   // the current value, |callback| is subsequently invoked.  If the edges have
 142   // not changed, |callback| is never run.
 143   //
 144   // The return value is a bitmask of AppbarAutohideEdge.
 145   virtual int GetAppbarAutohideEdges(HMONITOR monitor,
 146                                      const base::Closure& callback);
 147 #endif
 148
 149   // The active ViewsDelegate used by the views system.
 150   static ViewsDelegate* views_delegate;
 151
 152  private:
 153   scoped_ptr<ViewsTouchSelectionControllerFactory> views_tsc_factory_;
 154
 155   DISALLOW_COPY_AND_ASSIGN(ViewsDelegate);
 156 };
 157
 158 }  // namespace views
 159
 160 #endif  // UI_VIEWS_VIEWS_DELEGATE_H_