blob: 2f19cea32ba7fdcab66c897abdc2d15dff07e3a6 [file] [log] [blame]
// 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.
#include "ash/ash_export.h"
#include "base/macros.h"
namespace ui {
class ScrollEvent;
namespace ash {
// This handles 3-finger touchpad scroll events to enter/exit overview mode.
class ASH_EXPORT OverviewGestureHandler {
virtual ~OverviewGestureHandler();
// Processes a scroll event and may start overview. Returns true if the event
// has been handled and should not be processed further, false otherwise.
bool ProcessScrollEvent(const ui::ScrollEvent& event);
friend class OverviewGestureHandlerTest;
// The total distance scrolled with three fingers up to the point when an
// action is triggered. When the action (enter / exit overview mode or move
// selection in overview) is triggered those values are reset to zero.
float scroll_x_;
float scroll_y_;
// The threshold before engaging overview with a touchpad three-finger scroll.
static const float vertical_threshold_pixels_;
// The threshold before moving selector horizontally when using a touchpad
// two or three-finger scroll.
static const float horizontal_threshold_pixels_;
} // namespace ash