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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 "ash/drag_drop/drag_image_view.h"
#include "skia/ext/image_operations.h"
#include "ui/aura/window.h"
#include "ui/compositor/dip_util.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/size_conversions.h"
#include "ui/views/corewm/shadow_types.h"
#include "ui/views/widget/widget.h"
namespace ash {
namespace internal {
namespace {
using views::Widget;
Widget* CreateDragWidget(gfx::NativeView context) {
Widget* drag_widget = new Widget;
Widget::InitParams params;
params.type = Widget::InitParams::TYPE_TOOLTIP;
params.keep_on_top = true;
params.context = context;
params.accept_events = false;
params.ownership = Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
params.transparent = true;
drag_widget->Init(params);
drag_widget->SetOpacity(0xFF);
drag_widget->GetNativeWindow()->set_owned_by_parent(false);
SetShadowType(drag_widget->GetNativeView(), views::corewm::SHADOW_TYPE_NONE);
return drag_widget;
}
}
DragImageView::DragImageView(gfx::NativeView context) : views::ImageView() {
widget_.reset(CreateDragWidget(context));
widget_->SetContentsView(this);
widget_->SetAlwaysOnTop(true);
// We are owned by the DragDropController.
set_owned_by_client();
}
DragImageView::~DragImageView() {
widget_->Hide();
}
void DragImageView::SetBoundsInScreen(const gfx::Rect& bounds) {
widget_->SetBounds(bounds);
widget_size_ = bounds.size();
}
void DragImageView::SetScreenPosition(const gfx::Point& position) {
widget_->SetBounds(gfx::Rect(position, widget_size_));
}
void DragImageView::SetWidgetVisible(bool visible) {
if (visible != widget_->IsVisible()) {
if (visible)
widget_->Show();
else
widget_->Hide();
}
}
void DragImageView::OnPaint(gfx::Canvas* canvas) {
if (GetImage().isNull())
return;
// |widget_size_| is in DIP. ImageSkia::size() also returns the size in DIP.
if (GetImage().size() == widget_size_) {
canvas->DrawImageInt(GetImage(), 0, 0);
} else {
float device_scale = 1;
if (widget_->GetNativeView() && widget_->GetNativeView()->layer()) {
device_scale = ui::GetDeviceScaleFactor(
widget_->GetNativeView()->layer());
}
ui::ScaleFactor device_scale_factor =
ui::GetScaleFactorFromScale(device_scale);
// The drag image already has device scale factor applied. But
// |widget_size_| is in DIP units.
gfx::Size scaled_widget_size = gfx::ToRoundedSize(
gfx::ScaleSize(widget_size_, device_scale));
gfx::ImageSkiaRep image_rep = GetImage().GetRepresentation(
device_scale_factor);
if (image_rep.is_null())
return;
SkBitmap scaled = skia::ImageOperations::Resize(
image_rep.sk_bitmap(), skia::ImageOperations::RESIZE_LANCZOS3,
scaled_widget_size.width(), scaled_widget_size.height());
gfx::ImageSkia image_skia(gfx::ImageSkiaRep(scaled, device_scale_factor));
canvas->DrawImageInt(image_skia, 0, 0);
}
}
} // namespace internal
} // namespace ash
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