drag_image_view.cc revision 68043e1e95eeb07d5cae7aca370b26518b0867d6 
1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "ash/drag_drop/drag_image_view.h"
6
7#include "skia/ext/image_operations.h"
8#include "ui/aura/window.h"
9#include "ui/compositor/dip_util.h"
10#include "ui/gfx/canvas.h"
11#include "ui/gfx/size_conversions.h"
12#include "ui/views/corewm/shadow_types.h"
13#include "ui/views/widget/widget.h"
14
15namespace ash {
16namespace internal {
17
18namespace {
19using views::Widget;
20
21Widget* CreateDragWidget(gfx::NativeView context) {
22  Widget* drag_widget = new Widget;
23  Widget::InitParams params;
24  params.type = Widget::InitParams::TYPE_TOOLTIP;
25  params.keep_on_top = true;
26  params.context = context;
27  params.accept_events = false;
28  params.ownership = Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
29  params.opacity = Widget::InitParams::TRANSLUCENT_WINDOW;
30  drag_widget->Init(params);
31  drag_widget->SetOpacity(0xFF);
32  drag_widget->GetNativeWindow()->set_owned_by_parent(false);
33  drag_widget->GetNativeWindow()->SetName("DragWidget");
34  SetShadowType(drag_widget->GetNativeView(), views::corewm::SHADOW_TYPE_NONE);
35  return drag_widget;
36}
37}
38
39DragImageView::DragImageView(gfx::NativeView context) : views::ImageView() {
40  widget_.reset(CreateDragWidget(context));
41  widget_->SetContentsView(this);
42  widget_->SetAlwaysOnTop(true);
43
44  // We are owned by the DragDropController.
45  set_owned_by_client();
46}
47
48DragImageView::~DragImageView() {
49  widget_->Hide();
50}
51
52void DragImageView::SetBoundsInScreen(const gfx::Rect& bounds) {
53  widget_->SetBounds(bounds);
54  widget_size_ = bounds.size();
55}
56
57void DragImageView::SetScreenPosition(const gfx::Point& position) {
58  widget_->SetBounds(gfx::Rect(position, widget_size_));
59}
60
61gfx::Rect DragImageView::GetBoundsInScreen() const {
62  return widget_->GetWindowBoundsInScreen();
63}
64
65void DragImageView::SetWidgetVisible(bool visible) {
66  if (visible != widget_->IsVisible()) {
67    if (visible)
68      widget_->Show();
69    else
70      widget_->Hide();
71  }
72}
73
74void DragImageView::SetOpacity(float visibility) {
75  DCHECK_GE(visibility, 0.0f);
76  DCHECK_LE(visibility, 1.0f);
77  widget_->SetOpacity(static_cast<int>(0xff * visibility));
78}
79
80void DragImageView::OnPaint(gfx::Canvas* canvas) {
81  if (GetImage().isNull())
82    return;
83
84  // |widget_size_| is in DIP. ImageSkia::size() also returns the size in DIP.
85  if (GetImage().size() == widget_size_) {
86    canvas->DrawImageInt(GetImage(), 0, 0);
87  } else {
88    float device_scale = 1;
89    if (widget_->GetNativeView() && widget_->GetNativeView()->layer()) {
90      device_scale = ui::GetDeviceScaleFactor(
91          widget_->GetNativeView()->layer());
92    }
93    // The drag image already has device scale factor applied. But
94    // |widget_size_| is in DIP units.
95    gfx::Size scaled_widget_size = gfx::ToRoundedSize(
96        gfx::ScaleSize(widget_size_, device_scale));
97    gfx::ImageSkiaRep image_rep = GetImage().GetRepresentation(device_scale);
98    if (image_rep.is_null())
99      return;
100    SkBitmap scaled = skia::ImageOperations::Resize(
101        image_rep.sk_bitmap(), skia::ImageOperations::RESIZE_LANCZOS3,
102        scaled_widget_size.width(), scaled_widget_size.height());
103    gfx::ImageSkia image_skia(gfx::ImageSkiaRep(scaled, device_scale));
104    canvas->DrawImageInt(image_skia, 0, 0);
105  }
106}
107
108}  // namespace internal
109}  // namespace ash
110