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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 "ash/display/display_manager.h"
#include "ash/screen_ash.h"
#include "ash/shell.h"
#include "ash/wm/coordinate_conversion.h"
#include "ash/wm/window_util.h"
#include "ui/aura/root_window.h"
#include "ui/aura/window.h"
#include "ui/base/events/event.h"
#include "ui/compositor/dip_util.h"
#include "ui/gfx/display.h"
#include "ui/gfx/screen.h"
namespace ash {
namespace internal {
namespace {
// Boost factor for non-integrated displays.
const float kBoostForNonIntegrated = 1.20f;
}
EventTransformationHandler::EventTransformationHandler()
: transformation_mode_(TRANSFORM_AUTO) {
}
EventTransformationHandler::~EventTransformationHandler() {
}
void EventTransformationHandler::OnScrollEvent(ui::ScrollEvent* event) {
if (transformation_mode_ == TRANSFORM_NONE)
return;
// Get the device scale factor and stack it on the final scale factor.
gfx::Point point_in_screen(event->location());
aura::Window* target = static_cast<aura::Window*>(event->target());
const float scale_at_target = ui::GetDeviceScaleFactor(target->layer());
float scale = scale_at_target;
// Apply some additional scaling if the display is non-integrated.
wm::ConvertPointToScreen(target, &point_in_screen);
const gfx::Display& display =
Shell::GetScreen()->GetDisplayNearestPoint(point_in_screen);
DisplayManager* display_manager = Shell::GetInstance()->display_manager();
if (!display_manager->IsInternalDisplayId(display.id()))
scale *= kBoostForNonIntegrated;
event->Scale(scale);
}
} // namespace internal
} // namespace ash
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