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// Copyright (c) 2012 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_UI_VIEWS_PANELS_TASKBAR_WINDOW_THUMBNAILER_WIN_H_
#define CHROME_BROWSER_UI_VIEWS_PANELS_TASKBAR_WINDOW_THUMBNAILER_WIN_H_
#include <vector>
#include "base/memory/scoped_ptr.h"
#include "ui/base/win/hwnd_subclass.h"
class SkBitmap;
class TaskbarWindowThumbnailerDelegateWin {
public:
// Returns the list of handles for all windows that are used to construct the
// thumbnail. If empty list is returned, the snapshot of current window
// is used.
virtual std::vector<HWND> GetSnapshotWindowHandles() const = 0;
};
// Provides the custom thumbnail and live preview for the window that appears
// in the taskbar (Windows 7 and later).
class TaskbarWindowThumbnailerWin : public ui::HWNDMessageFilter {
public:
TaskbarWindowThumbnailerWin(HWND hwnd,
TaskbarWindowThumbnailerDelegateWin* delegate);
virtual ~TaskbarWindowThumbnailerWin();
// Starts using the custom snapshot for live preview. The snapshot is only
// captured once when the system requests it, so the updates of the panels'
// content will not be automatically reflected in the thumbnail.
void Start();
// Stops providing the custom snapshot for live preview.
void Stop();
// Captures the snapshot now instead of when the system requests it.
void CaptureSnapshot();
// Invalidates the snapshot such that a fresh copy can be obtained next time
// when the system requests it.
void InvalidateSnapshot();
// Provide the snapshot to the new window. If the snapshot is captured for the
// old window, it will also be used for the new window.
void ReplaceWindow(HWND new_hwnd);
private:
// Overridden from ui::HWNDMessageFilter:
virtual bool FilterMessage(HWND hwnd,
UINT message,
WPARAM w_param,
LPARAM l_param,
LRESULT* l_result) OVERRIDE;
// Message handlers.
bool OnDwmSendIconicThumbnail(int width, int height, LRESULT* l_result);
bool OnDwmSendIconicLivePreviewBitmap(LRESULT* l_result);
// Captures and returns the screenshot of the window. The caller is
// responsible to release the returned SkBitmap instance.
SkBitmap* CaptureWindowImage() const;
HWND hwnd_;
TaskbarWindowThumbnailerDelegateWin* delegate_; // Weak, owns us.
scoped_ptr<SkBitmap> capture_bitmap_;
DISALLOW_COPY_AND_ASSIGN(TaskbarWindowThumbnailerWin);
};
#endif // CHROME_BROWSER_UI_VIEWS_PANELS_TASKBAR_WINDOW_THUMBNAILER_WIN_H_
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