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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 UI_VIEWS_COREWM_COMPOUND_EVENT_FILTER_H_
#define UI_VIEWS_COREWM_COMPOUND_EVENT_FILTER_H_
#include "base/compiler_specific.h"
#include "base/observer_list.h"
#include "ui/events/event.h"
#include "ui/events/event_handler.h"
#include "ui/gfx/native_widget_types.h"
#include "ui/views/views_export.h"
namespace aura {
class CursorManager;
class RootWindow;
}
namespace ui {
class GestureEvent;
class KeyEvent;
class LocatedEvent;
class MouseEvent;
class TouchEvent;
}
namespace views {
namespace corewm {
// CompoundEventFilter gets all events first and can provide actions to those
// events. It implements global features such as click to activate a window and
// cursor change when moving mouse.
// Additional event filters can be added to CompoundEventFilter. Events will
// pass through those additional filters in their addition order and could be
// consumed by any of those filters. If an event is consumed by a filter, the
// rest of the filter(s) and CompoundEventFilter will not see the consumed
// event.
class VIEWS_EXPORT CompoundEventFilter : public ui::EventHandler {
public:
CompoundEventFilter();
virtual ~CompoundEventFilter();
// Returns the cursor for the specified component.
static gfx::NativeCursor CursorForWindowComponent(int window_component);
// Used to allow a mouse event to show the cursor even when
// the cursor is hidden by |CursorClient::ShowCursor(false)|.
void set_cursor_hidden_by_filter(bool cursor_hidden_by_filter) {
cursor_hidden_by_filter_ = cursor_hidden_by_filter;
}
// Adds/removes additional event filters. This does not take ownership of
// the EventHandler.
// NOTE: These handlers are deprecated. Use env::AddPreTargetEventHandler etc.
// instead.
void AddHandler(ui::EventHandler* filter);
void RemoveHandler(ui::EventHandler* filter);
private:
// Updates the cursor if the target provides a custom one, and provides
// default resize cursors for window edges.
void UpdateCursor(aura::Window* target, ui::MouseEvent* event);
// Dispatches event to additional filters.
void FilterKeyEvent(ui::KeyEvent* event);
void FilterMouseEvent(ui::MouseEvent* event);
void FilterTouchEvent(ui::TouchEvent* event);
// Sets the visibility of the cursor if the event is not synthesized and
// 1) it's hiding (show=false) when the cursor is currently shown, or
// 2) it's showing (show=true) if the cursor is previously hidden
// by this event filter (see |cursor_hidden_by_filter_|),
// so that it doesn't change the cursor visibility if the cursor was
// intentionally hidden by other components.
void SetCursorVisibilityOnEvent(aura::Window* target,
ui::Event* event,
bool show);
// Enables or disables mouse events if the event is not synthesized.
void SetMouseEventsEnableStateOnEvent(aura::Window* target,
ui::Event* event,
bool enable);
// Overridden from ui::EventHandler:
virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
virtual void OnScrollEvent(ui::ScrollEvent* event) OVERRIDE;
virtual void OnTouchEvent(ui::TouchEvent* event) OVERRIDE;
virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
// Additional pre-target event handlers.
ObserverList<ui::EventHandler, true> handlers_;
// True if the cursur was hidden by the filter.
bool cursor_hidden_by_filter_;
DISALLOW_COPY_AND_ASSIGN(CompoundEventFilter);
};
} // namespace corewm
} // namespace views
#endif // UI_VIEWS_COREWM_COMPOUND_EVENT_FILTER_H_
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