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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.
#include "ui/views/drag_utils.h"
#include "ui/aura/client/drag_drop_client.h"
#include "ui/aura/window.h"
#include "ui/aura/window_event_dispatcher.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/display.h"
#include "ui/gfx/screen.h"
#include "ui/gfx/size.h"
#include "ui/views/widget/widget.h"
float GetDeviceScaleForNativeView(views::Widget* widget) {
float device_scale = 1.0f;
// The following code should work on other platforms as well. But we do not
// yet care about device scale factor on other platforms. So to keep drag and
// drop behavior on other platforms un-touched, we wrap this in the #if guard.
if (widget && widget->GetNativeView()) {
gfx::NativeView view = widget->GetNativeView();
gfx::Display display = gfx::Screen::GetScreenFor(view)->
GetDisplayNearestWindow(view);
device_scale = display.device_scale_factor();
}
return device_scale;
}
namespace views {
void RunShellDrag(gfx::NativeView view,
const ui::OSExchangeData& data,
const gfx::Point& location,
int operation,
ui::DragDropTypes::DragEventSource source) {
gfx::Point root_location(location);
aura::Window* root_window = view->GetRootWindow();
aura::Window::ConvertPointToTarget(view, root_window, &root_location);
if (aura::client::GetDragDropClient(root_window)) {
aura::client::GetDragDropClient(root_window)->StartDragAndDrop(
data, root_window, view, root_location, operation, source);
}
}
gfx::Canvas* GetCanvasForDragImage(views::Widget* widget,
const gfx::Size& canvas_size) {
float device_scale = GetDeviceScaleForNativeView(widget);
return new gfx::Canvas(canvas_size, device_scale, false);
}
} // namespace views
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