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// Copyright 2013 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 ASH_WM_OVERVIEW_WINDOW_SELECTOR_H_
#define ASH_WM_OVERVIEW_WINDOW_SELECTOR_H_
#include <set>
#include <vector>
#include "ash/ash_export.h"
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/scoped_vector.h"
#include "base/time/time.h"
#include "ui/aura/window_observer.h"
#include "ui/aura/window_tracker.h"
#include "ui/events/event_handler.h"
#include "ui/gfx/display_observer.h"
#include "ui/views/controls/textfield/textfield_controller.h"
#include "ui/wm/public/activation_change_observer.h"
namespace aura {
class RootWindow;
class Window;
}
namespace gfx {
class Rect;
}
namespace ui {
class LocatedEvent;
}
namespace views {
class Textfield;
class Widget;
}
namespace ash {
class WindowSelectorDelegate;
class WindowSelectorItem;
class WindowSelectorTest;
class WindowGrid;
// The WindowSelector shows a grid of all of your windows, allowing to select
// one by clicking or tapping on it.
class ASH_EXPORT WindowSelector
: public gfx::DisplayObserver,
public aura::WindowObserver,
public aura::client::ActivationChangeObserver,
public views::TextfieldController {
public:
// The distance between the top edge of the screen and the bottom edge of
// the text filtering textfield.
static const int kTextFilterBottomEdge;
enum Direction {
LEFT,
UP,
RIGHT,
DOWN
};
typedef std::vector<aura::Window*> WindowList;
typedef ScopedVector<WindowSelectorItem> WindowSelectorItemList;
WindowSelector(const WindowList& windows,
WindowSelectorDelegate* delegate);
virtual ~WindowSelector();
// Cancels window selection.
void CancelSelection();
// Called when the last window selector item from a grid is deleted.
void OnGridEmpty(WindowGrid* grid);
// gfx::DisplayObserver:
virtual void OnDisplayAdded(const gfx::Display& display) OVERRIDE;
virtual void OnDisplayRemoved(const gfx::Display& display) OVERRIDE;
virtual void OnDisplayMetricsChanged(const gfx::Display& display,
uint32_t metrics) OVERRIDE;
// aura::WindowObserver:
virtual void OnWindowAdded(aura::Window* new_window) OVERRIDE;
virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
// aura::client::ActivationChangeObserver:
virtual void OnWindowActivated(aura::Window* gained_active,
aura::Window* lost_active) OVERRIDE;
virtual void OnAttemptToReactivateWindow(
aura::Window* request_active,
aura::Window* actual_active) OVERRIDE;
// views::TextfieldController:
virtual void ContentsChanged(views::Textfield* sender,
const base::string16& new_contents) OVERRIDE;
virtual bool HandleKeyEvent(views::Textfield* sender,
const ui::KeyEvent& key_event) OVERRIDE;
private:
friend class WindowSelectorTest;
// Begins positioning windows such that all windows are visible on the screen.
void StartOverview();
// Position all of the windows in the overview.
void PositionWindows(bool animate);
// Hide and track all hidden windows not in the overview item list.
void HideAndTrackNonOverviewWindows();
// |focus|, restores focus to the stored window.
void ResetFocusRestoreWindow(bool focus);
// Helper function that moves the selection widget to |direction| on the
// corresponding window grid.
void Move(Direction direction, bool animate);
// Tracks observed windows.
std::set<aura::Window*> observed_windows_;
// Weak pointer to the selector delegate which will be called when a
// selection is made.
WindowSelectorDelegate* delegate_;
// A weak pointer to the window which was focused on beginning window
// selection. If window selection is canceled the focus should be restored to
// this window.
aura::Window* restore_focus_window_;
// True when performing operations that may cause window activations. This is
// used to prevent handling the resulting expected activation.
bool ignore_activations_;
// List of all the window overview grids, one for each root window.
ScopedVector<WindowGrid> grid_list_;
// Tracks windows which were hidden because they were not part of the
// overview.
aura::WindowTracker hidden_windows_;
// Tracks the index of the root window the selection widget is in.
size_t selected_grid_index_;
// The following variables are used for metric collection purposes. All of
// them refer to this particular overview session and are not cumulative:
// The time when overview was started.
base::Time overview_start_time_;
// The number of arrow key presses.
size_t num_key_presses_;
// The number of items in the overview.
size_t num_items_;
// Indicates if we are showing the selection widget.
bool showing_selection_widget_;
// Window text filter widget. As the user writes on it, we filter the items
// in the overview. It is also responsible for handling overview key events,
// such as enter key to select.
scoped_ptr<views::Widget> text_filter_widget_;
// The current length of the string entered into the text filtering textfield.
size_t text_filter_string_length_;
// The number of times the text filtering textfield has been cleared of text
// during this overview mode session.
size_t num_times_textfield_cleared_;
DISALLOW_COPY_AND_ASSIGN(WindowSelector);
};
} // namespace ash
#endif // ASH_WM_OVERVIEW_WINDOW_SELECTOR_H_
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