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- // Copyright (c) 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/display/event_transformation_handler.h"
- #include <cmath>
- #include "ui/aura/window.h"
- #include "ui/aura/window_event_dispatcher.h"
- #include "ui/display/display.h"
- #include "ui/display/screen.h"
- #include "ui/events/event.h"
- #include "ui/wm/core/coordinate_conversion.h"
- namespace ash {
- namespace {
- // Boost factor for non-integrated displays.
- const float kBoostForNonIntegrated = 1.20f;
- } // namespace
- EventTransformationHandler::EventTransformationHandler()
- : transformation_mode_(TRANSFORM_AUTO) {}
- EventTransformationHandler::~EventTransformationHandler() = default;
- void EventTransformationHandler::OnScrollEvent(ui::ScrollEvent* event) {
- if (transformation_mode_ == TRANSFORM_NONE)
- return;
- // It is unnecessary to scale the event for the device scale factor since
- // the event locations etc. are already in DIP.
- gfx::Point point_in_screen(event->location());
- aura::Window* target = static_cast<aura::Window*>(event->target());
- ::wm::ConvertPointToScreen(target, &point_in_screen);
- const display::Display& display =
- display::Screen::GetScreen()->GetDisplayNearestPoint(point_in_screen);
- // Apply some additional scaling if the display is non-integrated.
- if (!display.IsInternal())
- event->Scale(kBoostForNonIntegrated);
- }
- } // namespace ash
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