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 "skia/ext/image_operations.h"
   8 #include "ui/aura/window.h"
   9 #include "ui/base/resource/resource_bundle.h"
  10 #include "ui/compositor/dip_util.h"
  11 #include "ui/gfx/canvas.h"
  12 #include "ui/gfx/size_conversions.h"
  13 #include "ui/resources/grit/ui_resources.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
  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
  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
  52 DragImageView::~DragImageView() {
  53   widget_->Hide();
  54 }
  55
  56 void DragImageView::SetBoundsInScreen(const gfx::Rect& bounds) {
  57   widget_->SetBounds(bounds);
  58   widget_size_ = bounds.size();
  59 }
  60
  61 void DragImageView::SetScreenPosition(const gfx::Point& position) {
  62   widget_->SetBounds(gfx::Rect(position, widget_size_));
  63 }
  64
  65 gfx::Rect DragImageView::GetBoundsInScreen() const {
  66   return widget_->GetWindowBoundsInScreen();
  67 }
  68
  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
  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
  84 void DragImageView::SetTouchDragOperation(int operation) {
  85   if (touch_drag_operation_ == operation)
  86     return;
  87   touch_drag_operation_ = operation;
  88   SchedulePaint();
  89 }
  90
  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
  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
 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