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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_AEROPEEK_MANAGER_H_
#define CHROME_BROWSER_AEROPEEK_MANAGER_H_
#pragma once
#include <windows.h>
#include <list>
#include "chrome/browser/tabs/tab_strip_model_observer.h"
#include "ui/gfx/insets.h"
class AeroPeekWindow;
class SkBitmap;
class TabContentsWrapper;
namespace content {
class WebContents;
}
namespace gfx {
class Size;
}
// A class which defines interfaces called from AeroPeekWindow.
// This class is used for dispatching an event received by a thumbnail window
// and for retrieving information from Chrome.
// An AeroPeek window receives the following events:
// * A user clicks an AeroPeek thumbnail.
// We need to select a tab associated with this window.
// * A user closes an AeroPeek thumbnail.
// We need to close a tab associated with this window.
// * A user clicks a toolbar button in an AeroPeek window.
// We may need to dispatch this button event to a tab associated with this
// thumbnail window.
// <http://msdn.microsoft.com/en-us/library/dd378460(VS.85).aspx#thumbbars>.
// Also, it needs the following information of the browser:
// * The bitmap of a tab associated with this window.
// This bitmap is used for creating thumbnail and preview images.
// * The rectangle of a browser frame.
// This rectangle is used for pasting the above bitmap to the right position
// and for marking the tab-content area as opaque.
// We assume these functions are called only from a UI thread (i.e.
// Chrome_BrowserMain).
class AeroPeekWindowDelegate {
public:
virtual void ActivateTab(int tab_id) = 0;
virtual void CloseTab(int tab_id) = 0;
virtual void GetContentInsets(gfx::Insets* insets) = 0;
virtual bool GetTabThumbnail(int tab_id, SkBitmap* thumbnail) = 0;
virtual bool GetTabPreview(int tab_id, SkBitmap* preview) = 0;
protected:
virtual ~AeroPeekWindowDelegate() {}
};
// A class that implements AeroPeek of Windows 7:
// <http://msdn.microsoft.com/en-us/library/dd378460(VS.85).aspx#thumbnails>.
// Windows 7 can dispay a thumbnail image of each tab to its taskbar so that
// a user can preview the contents of a tab (AeroPeek), choose a tab, close
// a tab, etc.
// This class implements the TabStripModelObserver interface to receive the
// following events sent from TabStripModel and dispatch them to Windows:
// * A tab is added.
// This class adds a thumbnail window for this tab to the thumbnail list
// of Windows.
// * A tab is being closed.
// This class deletes the thumbnail window associated with this tab from the
// thumbnail list of Windows.
// * A tab has been updated.
// This class updates the image of the thumbnail window associated with this
// tab.
// Also, this class receives events sent from Windows via thumbnail windows to
// TabStripModel:
// * A thumbnail window is closed.
// Ask TabStrip to close the tab associated with this thumbnail window.
// * A thumbnail window is selected.
// Ask TabStrip to activate the tab associated with this thumbnail window.
//
// The simplest usage of this class is:
// 1. Create an instance of TabThumbnailManager.
// 2. Add this instance to the observer list of a TabStrip object.
//
// scoped_ptr<TabThumbnailManager> manager;
// manager.reset(new TabThumbnailManager(
// frame_->GetWindow()->GetNativeWindow(),
// border_left,
// border_top,
// toolbar_top));
// g_browser->tabstrip_model()->AddObserver(manager);
//
// 3. Remove this instance from the observer list of the TabStrip object when
// we don't need it.
//
// g_browser->tabstrip_model()->RemoveObserver(manager);
//
class AeroPeekManager : public TabStripModelObserver,
public AeroPeekWindowDelegate {
public:
explicit AeroPeekManager(HWND application_window);
virtual ~AeroPeekManager();
// Sets the margins of the "user-perceived content area".
// (See comments of |content_insets_|).
void SetContentInsets(const gfx::Insets& insets);
// Returns whether or not we should enable Tab Thumbnailing and Aero Peek
// of Windows 7.
static bool Enabled();
// Overridden from TabStripModelObserver:
virtual void TabInsertedAt(TabContentsWrapper* contents,
int index,
bool foreground);
virtual void TabDetachedAt(TabContentsWrapper* contents, int index);
virtual void ActiveTabChanged(TabContentsWrapper* old_contents,
TabContentsWrapper* new_contents,
int index,
bool user_gesture);
virtual void TabMoved(TabContentsWrapper* contents,
int from_index,
int to_index,
bool pinned_state_changed);
virtual void TabChangedAt(TabContentsWrapper* contents,
int index,
TabChangeType change_type);
virtual void TabReplacedAt(TabStripModel* tab_strip_model,
TabContentsWrapper* old_contents,
TabContentsWrapper* new_contents,
int index);
// Overriden from TabThumbnailWindowDelegate:
virtual void CloseTab(int tab_id);
virtual void ActivateTab(int tab_id);
virtual void GetContentInsets(gfx::Insets* insets);
virtual bool GetTabThumbnail(int tab_id, SkBitmap* thumbnail);
virtual bool GetTabPreview(int tab_id, SkBitmap* preview);
private:
// Deletes the TabThumbnailWindow object associated with the specified
// Tab ID.
void DeleteAeroPeekWindow(int tab_id);
// If there is an AeroPeekWindow associated with |tab| it is removed and
// deleted.
void DeleteAeroPeekWindowForTab(TabContentsWrapper* tab);
// Retrieves the AeroPeekWindow object associated with the specified
// Tab ID.
AeroPeekWindow* GetAeroPeekWindow(int tab_id) const;
// If an AeroPeekWindow hasn't been created for |tab| yet, one is created.
// |foreground| is true if the tab is selected.
void CreateAeroPeekWindowIfNecessary(TabContentsWrapper* tab,
bool foreground);
// Returns a rectangle that fits into the destination rectangle and keeps
// the pixel-aspect ratio of the source one.
// (This function currently uses the longer-fit algorithm as IE8 does.)
void GetOutputBitmapSize(const gfx::Size& destination,
const gfx::Size& source,
gfx::Size* output) const;
// Returns the WebContents object associated with the specified Tab ID only
// if it is alive.
// Since Windows cannot send AeroPeek events directly to Chrome windows, we
// use a place-holder window to receive AeroPeek events. So, when Windows
// sends an AeroPeek event, the corresponding tab (and TabContents) may have
// been deleted by Chrome. To prevent us from accessing deleted TabContents,
// we need to check if the tab is still alive.
content::WebContents* GetWebContents(int tab_id) const;
// Returns the tab ID from the specified TabContentsWrapper.
int GetTabID(TabContentsWrapper* contents) const;
private:
// The parent window of the place-holder windows used by AeroPeek.
// In the case of Chrome, this window becomes a browser frame.
HWND application_window_;
// The list of the place-holder windows used by AeroPeek.
std::list<AeroPeekWindow*> tab_list_;
// The left and top borders of the frame window.
// When we create a preview bitmap, we use these values for preventing from
// over-writing the area of the browser frame.
int border_left_;
int border_top_;
// The top position of the toolbar.
// This value is used for setting the alpha values of the frame area so a
// preview image can use transparent colors only in the frame area.
int toolbar_top_;
// The margins of the "user-perceived content area".
// This value is used for pasting a tab image onto this "user-perceived
// content area" when creating a preview image.
gfx::Insets content_insets_;
};
#endif // CHROME_BROWSER_AEROPEEK_MANAGER_H_
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