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 "grit/ui_resources.h"
8 #include "skia/ext/image_operations.h"
9 #include "ui/aura/window.h"
10 #include "ui/base/resource/resource_bundle.h"
11 #include "ui/compositor/dip_util.h"
12 #include "ui/gfx/canvas.h"
13 #include "ui/gfx/size_conversions.h"
14 #include "ui/views/widget/widget.h"
15 #include "ui/wm/core/shadow_types.h"
16
17 namespace ash {
18 namespace {
19 using views::Widget;
20
CreateDragWidget(gfx::NativeView context)21 Widget* 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(), wm::SHADOW_TYPE_NONE);
35 return drag_widget;
36 }
37 }
38
DragImageView(gfx::NativeView context,ui::DragDropTypes::DragEventSource event_source)39 DragImageView::DragImageView(gfx::NativeView context,
40 ui::DragDropTypes::DragEventSource event_source)
41 : views::ImageView(),
42 drag_event_source_(event_source),
43 touch_drag_operation_(ui::DragDropTypes::DRAG_NONE) {
44 widget_.reset(CreateDragWidget(context));
45 widget_->SetContentsView(this);
46 widget_->SetAlwaysOnTop(true);
47
48 // We are owned by the DragDropController.
49 set_owned_by_client();
50 }
51
~DragImageView()52 DragImageView::~DragImageView() {
53 widget_->Hide();
54 }
55
SetBoundsInScreen(const gfx::Rect & bounds)56 void DragImageView::SetBoundsInScreen(const gfx::Rect& bounds) {
57 widget_->SetBounds(bounds);
58 widget_size_ = bounds.size();
59 }
60
SetScreenPosition(const gfx::Point & position)61 void DragImageView::SetScreenPosition(const gfx::Point& position) {
62 widget_->SetBounds(gfx::Rect(position, widget_size_));
63 }
64
GetBoundsInScreen() const65 gfx::Rect DragImageView::GetBoundsInScreen() const {
66 return widget_->GetWindowBoundsInScreen();
67 }
68
SetWidgetVisible(bool visible)69 void DragImageView::SetWidgetVisible(bool visible) {
70 if (visible != widget_->IsVisible()) {
71 if (visible)
72 widget_->Show();
73 else
74 widget_->Hide();
75 }
76 }
77
SetTouchDragOperationHintOff()78 void DragImageView::SetTouchDragOperationHintOff() {
79 // Simply set the drag type to non-touch so that no hint is drawn.
80 drag_event_source_ = ui::DragDropTypes::DRAG_EVENT_SOURCE_MOUSE;
81 SchedulePaint();
82 }
83
SetTouchDragOperation(int operation)84 void DragImageView::SetTouchDragOperation(int operation) {
85 if (touch_drag_operation_ == operation)
86 return;
87 touch_drag_operation_ = operation;
88 SchedulePaint();
89 }
90
SetTouchDragOperationHintPosition(const gfx::Point & position)91 void DragImageView::SetTouchDragOperationHintPosition(
92 const gfx::Point& position) {
93 if (touch_drag_operation_indicator_position_ == position)
94 return;
95 touch_drag_operation_indicator_position_ = position;
96 SchedulePaint();
97 }
98
SetOpacity(float visibility)99 void DragImageView::SetOpacity(float visibility) {
100 DCHECK_GE(visibility, 0.0f);
101 DCHECK_LE(visibility, 1.0f);
102 widget_->SetOpacity(static_cast<int>(0xff * visibility));
103 }
104
OnPaint(gfx::Canvas * canvas)105 void DragImageView::OnPaint(gfx::Canvas* canvas) {
106 if (GetImage().isNull())
107 return;
108
109 // |widget_size_| is in DIP. ImageSkia::size() also returns the size in DIP.
110 if (GetImage().size() == widget_size_) {
111 canvas->DrawImageInt(GetImage(), 0, 0);
112 } else {
113 float device_scale = 1;
114 if (widget_->GetNativeView() && widget_->GetNativeView()->layer()) {
115 device_scale = ui::GetDeviceScaleFactor(
116 widget_->GetNativeView()->layer());
117 }
118 // The drag image already has device scale factor applied. But
119 // |widget_size_| is in DIP units.
120 gfx::Size scaled_widget_size = gfx::ToRoundedSize(
121 gfx::ScaleSize(widget_size_, device_scale));
122 gfx::ImageSkiaRep image_rep = GetImage().GetRepresentation(device_scale);
123 if (image_rep.is_null())
124 return;
125 SkBitmap scaled = skia::ImageOperations::Resize(
126 image_rep.sk_bitmap(), skia::ImageOperations::RESIZE_LANCZOS3,
127 scaled_widget_size.width(), scaled_widget_size.height());
128 gfx::ImageSkia image_skia(gfx::ImageSkiaRep(scaled, device_scale));
129 canvas->DrawImageInt(image_skia, 0, 0);
130 }
131
132 if (drag_event_source_ != ui::DragDropTypes::DRAG_EVENT_SOURCE_TOUCH)
133 return;
134
135 // Select appropriate drag hint.
136 gfx::Image* drag_hint =
137 &ui::ResourceBundle::GetSharedInstance().GetImageNamed(
138 IDR_TOUCH_DRAG_TIP_NODROP);
139 if (touch_drag_operation_ & ui::DragDropTypes::DRAG_COPY) {
140 drag_hint = &ui::ResourceBundle::GetSharedInstance().GetImageNamed(
141 IDR_TOUCH_DRAG_TIP_COPY);
142 } else if (touch_drag_operation_ & ui::DragDropTypes::DRAG_MOVE) {
143 drag_hint = &ui::ResourceBundle::GetSharedInstance().GetImageNamed(
144 IDR_TOUCH_DRAG_TIP_MOVE);
145 } else if (touch_drag_operation_ & ui::DragDropTypes::DRAG_LINK) {
146 drag_hint = &ui::ResourceBundle::GetSharedInstance().GetImageNamed(
147 IDR_TOUCH_DRAG_TIP_LINK);
148 }
149 if (!drag_hint->IsEmpty()) {
150 gfx::Size drag_hint_size = drag_hint->Size();
151
152 // Enlarge widget if required to fit the drag hint image.
153 if (drag_hint_size.width() > widget_size_.width() ||
154 drag_hint_size.height() > widget_size_.height()) {
155 gfx::Size new_widget_size = widget_size_;
156 new_widget_size.SetToMax(drag_hint_size);
157 widget_->SetSize(new_widget_size);
158 }
159
160 // Make sure drag hint image is positioned within the widget.
161 gfx::Point drag_hint_position = touch_drag_operation_indicator_position_;
162 drag_hint_position.Offset(-drag_hint_size.width() / 2, 0);
163 gfx::Rect drag_hint_bounds(drag_hint_position, drag_hint_size);
164 drag_hint_bounds.AdjustToFit(gfx::Rect(widget_size_));
165
166 // Draw image.
167 canvas->DrawImageInt(*(drag_hint->ToImageSkia()),
168 drag_hint_bounds.x(), drag_hint_bounds.y());
169 }
170 }
171
172 } // namespace ash
173