| // 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/wm/gestures/overview_gesture_handler.h" |
| |
| #include "ash/metrics/user_metrics_recorder.h" |
| #include "ash/shell.h" |
| #include "ash/wm/coordinate_conversion.h" |
| #include "ash/wm/overview/window_selector_controller.h" |
| #include "ui/aura/window.h" |
| #include "ui/events/event.h" |
| #include "ui/events/event_constants.h" |
| #include "ui/gfx/rect.h" |
| #include "ui/gfx/screen.h" |
| |
| namespace ash { |
| namespace { |
| |
| // The number of pixels from the top of the screen (a virtual bezel) to allow |
| // the overview swipe down gesture to begin within. Note this does not actually |
| // prevent handling of the touches so a fullscreen page which consumes these can |
| // prevent entering overview with a swipe down. |
| const int kTopBezelExtraPixels = 5; |
| |
| // The threshold before engaging overview on a three finger swipe on the |
| // touchpad. |
| const float kSwipeThresholdPixels = 300; |
| |
| } // namespace; |
| |
| OverviewGestureHandler::OverviewGestureHandler() |
| : in_top_bezel_gesture_(false), |
| scroll_x_(0), |
| scroll_y_(0) { |
| } |
| |
| OverviewGestureHandler::~OverviewGestureHandler() { |
| } |
| |
| bool OverviewGestureHandler::ProcessScrollEvent(const ui::ScrollEvent& event) { |
| if (event.type() == ui::ET_SCROLL_FLING_START || |
| event.type() == ui::ET_SCROLL_FLING_CANCEL || |
| event.finger_count() != 3) { |
| scroll_x_ = scroll_y_ = 0; |
| return false; |
| } |
| |
| scroll_x_ += event.x_offset(); |
| scroll_y_ += event.y_offset(); |
| |
| // Horizontal swiping is ignored. |
| if (std::fabs(scroll_x_) >= std::fabs(scroll_y_)) { |
| scroll_x_ = scroll_y_ = 0; |
| return false; |
| } |
| |
| // Only allow swipe up to enter overview, down to exit. Ignore extra swiping |
| // in the wrong direction. |
| Shell* shell = Shell::GetInstance(); |
| if (shell->window_selector_controller()->IsSelecting()) { |
| if (scroll_y_ < 0) |
| scroll_x_ = scroll_y_ = 0; |
| if (scroll_y_ < kSwipeThresholdPixels) |
| return false; |
| } else { |
| if (scroll_y_ > 0) |
| scroll_x_ = scroll_y_ = 0; |
| if (scroll_y_ > -kSwipeThresholdPixels) |
| return false; |
| } |
| |
| // Reset scroll amount on toggling. |
| scroll_x_ = scroll_y_ = 0; |
| shell->metrics()->RecordUserMetricsAction(UMA_TOUCHPAD_GESTURE_OVERVIEW); |
| shell->window_selector_controller()->ToggleOverview(); |
| return true; |
| } |
| |
| bool OverviewGestureHandler::ProcessGestureEvent( |
| const ui::GestureEvent& event) { |
| // Detect at the beginning of any gesture whether it begins on the top bezel. |
| if (event.type() == ui::ET_GESTURE_BEGIN && |
| event.details().touch_points() == 1) { |
| gfx::Point point_in_screen(event.location()); |
| aura::Window* target = static_cast<aura::Window*>(event.target()); |
| wm::ConvertPointToScreen(target, &point_in_screen); |
| in_top_bezel_gesture_ = !Shell::GetScreen()->GetDisplayNearestPoint( |
| point_in_screen).bounds().y() + kTopBezelExtraPixels > |
| point_in_screen.y(); |
| return false; |
| } |
| |
| if (!in_top_bezel_gesture_ || |
| event.type() != ui::ET_GESTURE_SWIPE || |
| !event.details().swipe_down() || |
| event.details().touch_points() != 3) { |
| return false; |
| } |
| |
| Shell* shell = Shell::GetInstance(); |
| shell->metrics()->RecordUserMetricsAction(UMA_GESTURE_OVERVIEW); |
| shell->window_selector_controller()->ToggleOverview(); |
| return true; |
| } |
| |
| } // namespace ash |