gtk: Add menu_gtk from Chromium.
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Cheng Zhao
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browser/ui/gtk/menu_gtk.h
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browser/ui/gtk/menu_gtk.h
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef ATOM_BROWSER_UI_GTK_MENU_GTK_H_
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#define ATOM_BROWSER_UI_GTK_MENU_GTK_H_
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#include <gtk/gtk.h>
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#include <string>
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#include <vector>
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#include "base/memory/weak_ptr.h"
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#include "ui/base/gtk/gtk_signal.h"
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#include "ui/base/gtk/gtk_signal_registrar.h"
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#include "ui/gfx/point.h"
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namespace gfx {
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class Image;
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}
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namespace ui {
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class ButtonMenuItemModel;
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class MenuModel;
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}
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class MenuGtk {
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public:
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// Delegate class that lets another class control the status of the menu.
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class Delegate {
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public:
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virtual ~Delegate() {}
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// Called before a command is executed. This exists for the case where a
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// model is handling the actual execution of commands, but the delegate
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// still needs to know that some command got executed. This is called before
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// and not after the command is executed because its execution may delete
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// the menu and/or the delegate.
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virtual void CommandWillBeExecuted() {}
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// Called when the menu stops showing. This will be called before
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// ExecuteCommand if the user clicks an item, but will also be called when
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// the user clicks away from the menu.
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virtual void StoppedShowing() {}
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// Return true if we should override the "gtk-menu-images" system setting
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// when showing image menu items for this menu.
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virtual bool AlwaysShowIconForCmd(int command_id) const;
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// Returns a tinted image used in button in a menu.
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virtual GtkIconSet* GetIconSetForId(int idr);
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// Returns an icon for the menu item, if available.
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virtual GtkWidget* GetImageForCommandId(int command_id) const;
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static GtkWidget* GetDefaultImageForLabel(const std::string& label);
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};
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MenuGtk(MenuGtk::Delegate* delegate, ui::MenuModel* model);
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virtual ~MenuGtk();
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// Initialize GTK signal handlers.
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void ConnectSignalHandlers();
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// These methods are used to build the menu dynamically. The return value
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// is the new menu item.
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GtkWidget* AppendMenuItemWithLabel(int command_id, const std::string& label);
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GtkWidget* AppendMenuItemWithIcon(int command_id, const std::string& label,
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const gfx::Image& icon);
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GtkWidget* AppendCheckMenuItemWithLabel(int command_id,
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const std::string& label);
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GtkWidget* AppendSeparator();
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GtkWidget* InsertSeparator(int position);
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GtkWidget* AppendMenuItem(int command_id, GtkWidget* menu_item);
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GtkWidget* InsertMenuItem(int command_id, GtkWidget* menu_item, int position);
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GtkWidget* AppendMenuItemToMenu(int index,
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ui::MenuModel* model,
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GtkWidget* menu_item,
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GtkWidget* menu,
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bool connect_to_activate);
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GtkWidget* InsertMenuItemToMenu(int index,
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ui::MenuModel* model,
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GtkWidget* menu_item,
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GtkWidget* menu,
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int position,
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bool connect_to_activate);
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// Displays the menu near a widget, as if the widget were a menu bar.
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// Example: the wrench menu button.
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// |button| is the mouse button that brought up the menu.
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// |event_time| is the time from the GdkEvent.
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void PopupForWidget(GtkWidget* widget, int button, guint32 event_time);
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// Displays the menu as a context menu, i.e. at the cursor location.
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// It is implicit that it was brought up using the right mouse button.
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// |point| is the point where to put the menu.
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// |event_time| is the time of the event that triggered the menu's display.
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void PopupAsContext(const gfx::Point& point, guint32 event_time);
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// Displays the menu as a context menu for the passed status icon.
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void PopupAsContextForStatusIcon(guint32 event_time, guint32 button,
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GtkStatusIcon* icon);
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// Displays the menu following a keyboard event (such as selecting |widget|
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// and pressing "enter").
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void PopupAsFromKeyEvent(GtkWidget* widget);
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// Closes the menu.
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void Cancel();
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// Repositions the menu to be right under the button. Alignment is set as
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// object data on |void_widget| with the tag "left_align". If "left_align"
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// is true, it aligns the left side of the menu with the left side of the
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// button. Otherwise it aligns the right side of the menu with the right side
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// of the button. Public since some menus have odd requirements that don't
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// belong in a public class.
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static void WidgetMenuPositionFunc(GtkMenu* menu,
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int* x,
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int* y,
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gboolean* push_in,
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void* void_widget);
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// Positions the menu to appear at the gfx::Point represented by |userdata|.
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static void PointMenuPositionFunc(GtkMenu* menu,
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int* x,
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int* y,
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gboolean* push_in,
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gpointer userdata);
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GtkWidget* widget() const { return menu_; }
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// Updates all the enabled/checked states and the dynamic labels.
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void UpdateMenu();
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private:
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// Builds a GtkImageMenuItem.
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GtkWidget* BuildMenuItemWithImage(const std::string& label,
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const gfx::Image& icon);
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GtkWidget* BuildMenuItemWithImage(const std::string& label,
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GtkWidget* image);
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GtkWidget* BuildMenuItemWithLabel(const std::string& label,
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int command_id);
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// A function that creates a GtkMenu from |model_|.
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void BuildMenuFromModel();
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// Implementation of the above; called recursively.
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void BuildSubmenuFromModel(ui::MenuModel* model, GtkWidget* menu);
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// Builds a menu item with buttons in it from the data in the model.
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GtkWidget* BuildButtonMenuItem(ui::ButtonMenuItemModel* model,
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GtkWidget* menu);
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void ExecuteCommand(ui::MenuModel* model, int id);
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// Callback for when a menu item is clicked.
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CHROMEGTK_CALLBACK_0(MenuGtk, void, OnMenuItemActivated);
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// Called when one of the buttons is pressed.
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CHROMEGTK_CALLBACK_1(MenuGtk, void, OnMenuButtonPressed, int);
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// Called to maybe activate a button if that button isn't supposed to dismiss
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// the menu.
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CHROMEGTK_CALLBACK_1(MenuGtk, gboolean, OnMenuTryButtonPressed, int);
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// Updates all the menu items' state.
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CHROMEGTK_CALLBACK_0(MenuGtk, void, OnMenuShow);
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// Sets the activating widget back to a normal appearance.
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CHROMEGTK_CALLBACK_0(MenuGtk, void, OnMenuHidden);
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// Focus out event handler for the menu.
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CHROMEGTK_CALLBACK_1(MenuGtk, gboolean, OnMenuFocusOut, GdkEventFocus*);
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// Handles building dynamic submenus on demand when they are shown.
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CHROMEGTK_CALLBACK_0(MenuGtk, void, OnSubMenuShow);
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// Handles trearing down dynamic submenus when they have been closed.
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CHROMEGTK_CALLBACK_0(MenuGtk, void, OnSubMenuHidden);
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// Scheduled by OnSubMenuHidden() to avoid deleting submenus when hidden
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// before pending activations within them are delivered.
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static void OnSubMenuHiddenCallback(GtkWidget* submenu);
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// Sets the enable/disabled state and dynamic labels on our menu items.
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static void SetButtonItemInfo(GtkWidget* button, gpointer userdata);
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// Sets the check mark, enabled/disabled state and dynamic labels on our menu
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// items.
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static void SetMenuItemInfo(GtkWidget* widget, void* raw_menu);
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// Queries this object about the menu state.
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MenuGtk::Delegate* delegate_;
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// If non-NULL, the MenuModel that we use to populate and control the GTK
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// menu (overriding the delegate as a controller).
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ui::MenuModel* model_;
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// For some menu items, we want to show the accelerator, but not actually
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// explicitly handle it. To this end we connect those menu items' accelerators
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// to this group, but don't attach this group to any top level window.
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GtkAccelGroup* dummy_accel_group_;
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// gtk_menu_popup() does not appear to take ownership of popup menus, so
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// MenuGtk explicitly manages the lifetime of the menu.
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GtkWidget* menu_;
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// True when we should ignore "activate" signals. Used to prevent
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// menu items from getting activated when we are setting up the
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// menu.
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static bool block_activation_;
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ui::GtkSignalRegistrar signal_;
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base::WeakPtrFactory<MenuGtk> weak_factory_;
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};
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#endif // ATOM_BROWSER_UI_GTK_MENU_GTK_H_
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