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// Copyright (c) 2009 The Chromium OS 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 __PLATFORM_WINDOW_MANAGER_IMAGE_OVERLAY_H__
#define __PLATFORM_WINDOW_MANAGER_IMAGE_OVERLAY_H__
#include <map>
#include <string>
#include <tr1/memory>
extern "C" {
#include <X11/Xlib.h>
}
#include "base/basictypes.h"
#include "base/scoped_ptr.h"
#include "window_manager/clutter_interface.h"
namespace chromeos {
class ClutterInterface;
class XConnection;
// Display overlay images to help users learn keyboard shortcuts.
// The actor returned by group() should be added to the stage and moved to
// its center; the group's visibility and opacity can be manipulated
// directly.
class HotkeyOverlay {
public:
HotkeyOverlay(ClutterInterface* clutter);
~HotkeyOverlay();
ClutterInterface::Actor* group() { return group_.get(); }
// Handle keys being pressed and released.
void HandleKeyPress(KeySym keysym);
void HandleKeyRelease(KeySym keysym);
// Reset key state and switch to the base image.
// Useful to call when the overlay is first being shown and we don't know
// whether some keys may already be held down.
void Reset();
private:
// Helper method to choose the correct image based on the current key
// state.
void UpdateImage();
// Show the image located at 'filename'.
void ShowImage(const std::string& filename);
// Hide the current image.
void HideCurrentImage();
ClutterInterface* clutter_; // not owned
scoped_ptr<ClutterInterface::ContainerActor> group_;
// Map filenames to image actors.
std::map<std::string, std::tr1::shared_ptr<ClutterInterface::Actor> > images_;
// The currently-shown image, or NULL if no image is currently shown.
// Points at a value in 'images_'.
ClutterInterface::Actor* current_image_;
// The state of various keys.
bool left_ctrl_pressed_;
bool right_ctrl_pressed_;
bool left_alt_pressed_;
bool right_alt_pressed_;
bool left_shift_pressed_;
bool right_shift_pressed_;
DISALLOW_COPY_AND_ASSIGN(HotkeyOverlay);
};
} // namespace chromeos
#endif