ash/drag_drop/drag_image_view.cc

   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/corewm/shadow_types.h"
  15 #include "ui/views/widget/widget.h"
  16
  17 namespace ash {
  18 namespace internal {
  19
  20 namespace {
  21 using views::Widget;
  22
  23 Widget* CreateDragWidget(gfx::NativeView context) {
  24   Widget* drag_widget = new Widget;
  25   Widget::InitParams params;
  26   params.type = Widget::InitParams::TYPE_TOOLTIP;
  27   params.keep_on_top = true;
  28   params.context = context;
  29   params.accept_events = false;
  30   params.ownership = Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
  31   params.opacity = Widget::InitParams::TRANSLUCENT_WINDOW;
  32   drag_widget->Init(params);
  33   drag_widget->SetOpacity(0xFF);
  34   drag_widget->GetNativeWindow()->set_owned_by_parent(false);
  35   drag_widget->GetNativeWindow()->SetName("DragWidget");
  36   SetShadowType(drag_widget->GetNativeView(), views::corewm::SHADOW_TYPE_NONE);
  37   return drag_widget;
  38 }
  39 }
  40
  41 DragImageView::DragImageView(gfx::NativeView context,
  42                              ui::DragDropTypes::DragEventSource event_source)
  43     : views::ImageView(),
  44       drag_event_source_(event_source),
  45       touch_drag_operation_(ui::DragDropTypes::DRAG_NONE) {
  46   widget_.reset(CreateDragWidget(context));
  47   widget_->SetContentsView(this);
  48   widget_->SetAlwaysOnTop(true);
  49
  50   // We are owned by the DragDropController.
  51   set_owned_by_client();
  52 }
  53
  54 DragImageView::~DragImageView() {
  55   widget_->Hide();
  56 }
  57
  58 void DragImageView::SetBoundsInScreen(const gfx::Rect& bounds) {
  59   widget_->SetBounds(bounds);
  60   widget_size_ = bounds.size();
  61 }
  62
  63 void DragImageView::SetScreenPosition(const gfx::Point& position) {
  64   widget_->SetBounds(gfx::Rect(position, widget_size_));
  65 }
  66
  67 gfx::Rect DragImageView::GetBoundsInScreen() const {
  68   return widget_->GetWindowBoundsInScreen();
  69 }
  70
  71 void DragImageView::SetWidgetVisible(bool visible) {
  72   if (visible != widget_->IsVisible()) {
  73     if (visible)
  74       widget_->Show();
  75     else
  76       widget_->Hide();
  77   }
  78 }
  79
  80 void DragImageView::SetTouchDragOperationHintOff() {
  81   // Simply set the drag type to non-touch so that no hint is drawn.
  82   drag_event_source_ = ui::DragDropTypes::DRAG_EVENT_SOURCE_MOUSE;
  83   SchedulePaint();
  84 }
  85
  86 void DragImageView::SetTouchDragOperation(int operation) {
  87   if (touch_drag_operation_ == operation)
  88     return;
  89   touch_drag_operation_ = operation;
  90   SchedulePaint();
  91 }
  92
  93 void DragImageView::SetTouchDragOperationHintPosition(
  94     const gfx::Point& position) {
  95   if (touch_drag_operation_indicator_position_ == position)
  96     return;
  97   touch_drag_operation_indicator_position_ = position;
  98   SchedulePaint();
  99 }
 100
 101 void DragImageView::SetOpacity(float visibility) {
 102   DCHECK_GE(visibility, 0.0f);
 103   DCHECK_LE(visibility, 1.0f);
 104   widget_->SetOpacity(static_cast<int>(0xff * visibility));
 105 }
 106
 107 void DragImageView::OnPaint(gfx::Canvas* canvas) {
 108   if (GetImage().isNull())
 109     return;
 110
 111   // |widget_size_| is in DIP. ImageSkia::size() also returns the size in DIP.
 112   if (GetImage().size() == widget_size_) {
 113     canvas->DrawImageInt(GetImage(), 0, 0);
 114   } else {
 115     float device_scale = 1;
 116     if (widget_->GetNativeView() && widget_->GetNativeView()->layer()) {
 117       device_scale = ui::GetDeviceScaleFactor(
 118           widget_->GetNativeView()->layer());
 119     }
 120     // The drag image already has device scale factor applied. But
 121     // |widget_size_| is in DIP units.
 122     gfx::Size scaled_widget_size = gfx::ToRoundedSize(
 123         gfx::ScaleSize(widget_size_, device_scale));
 124     gfx::ImageSkiaRep image_rep = GetImage().GetRepresentation(device_scale);
 125     if (image_rep.is_null())
 126       return;
 127     SkBitmap scaled = skia::ImageOperations::Resize(
 128         image_rep.sk_bitmap(), skia::ImageOperations::RESIZE_LANCZOS3,
 129         scaled_widget_size.width(), scaled_widget_size.height());
 130     gfx::ImageSkia image_skia(gfx::ImageSkiaRep(scaled, device_scale));
 131     canvas->DrawImageInt(image_skia, 0, 0);
 132   }
 133
 134   if (drag_event_source_ != ui::DragDropTypes::DRAG_EVENT_SOURCE_TOUCH)
 135     return;
 136
 137   // Select appropriate drag hint.
 138   gfx::Image* drag_hint =
 139       &ui::ResourceBundle::GetSharedInstance().GetImageNamed(
 140       IDR_TOUCH_DRAG_TIP_NODROP);
 141   if (touch_drag_operation_ & ui::DragDropTypes::DRAG_COPY) {
 142     drag_hint = &ui::ResourceBundle::GetSharedInstance().GetImageNamed(
 143         IDR_TOUCH_DRAG_TIP_COPY);
 144   } else if (touch_drag_operation_ & ui::DragDropTypes::DRAG_MOVE) {
 145     drag_hint = &ui::ResourceBundle::GetSharedInstance().GetImageNamed(
 146         IDR_TOUCH_DRAG_TIP_MOVE);
 147   } else if (touch_drag_operation_ & ui::DragDropTypes::DRAG_LINK) {
 148     drag_hint = &ui::ResourceBundle::GetSharedInstance().GetImageNamed(
 149         IDR_TOUCH_DRAG_TIP_LINK);
 150   }
 151   if (!drag_hint->IsEmpty()) {
 152     gfx::Size drag_hint_size = drag_hint->Size();
 153
 154     // Enlarge widget if required to fit the drag hint image.
 155     if (drag_hint_size.width() > widget_size_.width() ||
 156         drag_hint_size.height() > widget_size_.height()) {
 157       gfx::Size new_widget_size = widget_size_;
 158       new_widget_size.SetToMax(drag_hint_size);
 159       widget_->SetSize(new_widget_size);
 160     }
 161
 162     // Make sure drag hint image is positioned within the widget.
 163     gfx::Point drag_hint_position = touch_drag_operation_indicator_position_;
 164     drag_hint_position.Offset(-drag_hint_size.width() / 2, 0);
 165     gfx::Rect drag_hint_bounds(drag_hint_position, drag_hint_size);
 166     drag_hint_bounds.AdjustToFit(gfx::Rect(widget_size_));
 167
 168     // Draw image.
 169     canvas->DrawImageInt(*(drag_hint->ToImageSkia()),
 170         drag_hint_bounds.x(), drag_hint_bounds.y());
 171   }
 172 }
 173
 174 }  // namespace internal
 175 }  // namespace ash