ui/web_dialogs/web_dialog_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_WEB_DIALOGS_WEB_DIALOG_DELEGATE_H_
   6 #define UI_WEB_DIALOGS_WEB_DIALOG_DELEGATE_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "base/strings/string16.h"
  12 #include "content/public/browser/web_contents_delegate.h"
  13 #include "ui/base/ui_base_types.h"
  14 #include "ui/base/window_open_disposition.h"
  15 #include "ui/web_dialogs/web_dialogs_export.h"
  16
  17 class GURL;
  18
  19 namespace content {
  20 class RenderViewHost;
  21 class WebContents;
  22 class WebUI;
  23 class WebUIMessageHandler;
  24 struct ContextMenuParams;
  25 struct OpenURLParams;
  26 }
  27
  28 namespace gfx {
  29 class Rect;
  30 class Size;
  31 }
  32
  33 namespace ui {
  34
  35 // Implement this class to receive notifications.
  36 class WEB_DIALOGS_EXPORT WebDialogDelegate {
  37  public:
  38   // Returns true if the contents needs to be run in a modal dialog.
  39   virtual ModalType GetDialogModalType() const = 0;
  40
  41   // Returns the title of the dialog.
  42   virtual base::string16 GetDialogTitle() const = 0;
  43
  44   // Returns the dialog's name identifier. Used to identify this dialog for
  45   // state restoration.
  46   virtual std::string GetDialogName() const;
  47
  48   // Get the HTML file path for the content to load in the dialog.
  49   virtual GURL GetDialogContentURL() const = 0;
  50
  51   // Get WebUIMessageHandler objects to handle messages from the HTML/JS page.
  52   // The handlers are used to send and receive messages from the page while it
  53   // is still open.  Ownership of each handler is taken over by the WebUI
  54   // hosting the page.
  55   virtual void GetWebUIMessageHandlers(
  56       std::vector<content::WebUIMessageHandler*>* handlers) const = 0;
  57
  58   // Get the size of the dialog.
  59   virtual void GetDialogSize(gfx::Size* size) const = 0;
  60
  61   // Get the size of the dialog.
  62   virtual void GetMinimumDialogSize(gfx::Size* size) const;
  63
  64   // Gets the JSON string input to use when showing the dialog.
  65   virtual std::string GetDialogArgs() const = 0;
  66
  67   // Returns true to signal that the dialog can be closed. Specialized
  68   // WebDialogDelegate subclasses can override this default behavior to allow
  69   // the close to be blocked until the user corrects mistakes, accepts an
  70   // agreement, etc.
  71   virtual bool CanCloseDialog() const;
  72
  73   // Returns true if the dialog can ever be resized. Default implementation
  74   // returns |true|.
  75   virtual bool CanResizeDialog() const;
  76
  77   // A callback to notify the delegate that |source|'s loading state has
  78   // changed.
  79   virtual void OnLoadingStateChanged(content::WebContents* source) {}
  80
  81   // A callback to notify the delegate that a web dialog has been shown.
  82   // |webui| is the WebUI with which the dialog is associated.
  83   // |render_view_host| is the RenderViewHost for the shown dialog.
  84   virtual void OnDialogShown(content::WebUI* webui,
  85                              content::RenderViewHost* render_view_host) {}
  86
  87   // A callback to notify the delegate that the dialog closed.
  88   // IMPORTANT: Implementations should delete |this| here (unless they've
  89   // arranged for the delegate to be deleted in some other way, e.g. by
  90   // registering it as a message handler in the WebUI object).
  91   virtual void OnDialogClosed(const std::string& json_retval) = 0;
  92
  93   // A callback to notify the delegate that the dialog is being closed in
  94   // response to a "dialogClose" message from WebUI.
  95   virtual void OnDialogCloseFromWebUI(const std::string& json_retval);
  96
  97   // A callback to notify the delegate that the contents have gone
  98   // away. Only relevant if your dialog hosts code that calls
  99   // windows.close() and you've allowed that.  If the output parameter
 100   // is set to true, then the dialog is closed.  The default is false.
 101   // |out_close_dialog| is never NULL.
 102   virtual void OnCloseContents(content::WebContents* source,
 103                                bool* out_close_dialog) = 0;
 104
 105   // A callback to allow the delegate to dictate that the window should not
 106   // have a title bar.  This is useful when presenting branded interfaces.
 107   virtual bool ShouldShowDialogTitle() const = 0;
 108
 109   // A callback to allow the delegate to inhibit context menu or show
 110   // customized menu.
 111   // Returns true iff you do NOT want the standard context menu to be
 112   // shown (because you want to handle it yourself).
 113   virtual bool HandleContextMenu(const content::ContextMenuParams& params);
 114
 115   // A callback to allow the delegate to open a new URL inside |source|.
 116   // On return |out_new_contents| should contain the WebContents the URL
 117   // is opened in. Return false to use the default handler.
 118   virtual bool HandleOpenURLFromTab(content::WebContents* source,
 119                                     const content::OpenURLParams& params,
 120                                     content::WebContents** out_new_contents);
 121
 122   // A callback to create a new tab with |new_contents|. |source| is the
 123   // WebContent where the operation originated. |disposition| controls how the
 124   // new tab should be opened. |initial_rect| is the position and size of the
 125   // window if a new window is created. |user_gesture| is true if the operation
 126   // was started by a user gesture. Return false to use the default handler.
 127   virtual bool HandleAddNewContents(content::WebContents* source,
 128                                     content::WebContents* new_contents,
 129                                     WindowOpenDisposition disposition,
 130                                     const gfx::Rect& initial_rect,
 131                                     bool user_gesture);
 132
 133   // A callback to control whether a WebContents will be created. Returns
 134   // false to disallow the creation. Return true to use the default handler.
 135   virtual bool HandleShouldCreateWebContents();
 136
 137   // Stores the dialog bounds.
 138   virtual void StoreDialogSize(const gfx::Size& dialog_size) {}
 139
 140   virtual ~WebDialogDelegate() {}
 141 };
 142
 143 }  // namespace ui
 144
 145 #endif  // UI_WEB_DIALOGS_WEB_DIALOG_DELEGATE_H_