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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/base/resource/resource_bundle.h"
#include "ui/compositor/dip_util.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/geometry/size_conversions.h"
#include "ui/resources/grit/ui_resources.h"
#include "ui/views/widget/widget.h"
#include "ui/wm/core/shadow_types.h"
namespace ash {
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.opacity = Widget::InitParams::TRANSLUCENT_WINDOW;
drag_widget->Init(params);
drag_widget->SetOpacity(0xFF);
drag_widget->GetNativeWindow()->set_owned_by_parent(false);
drag_widget->GetNativeWindow()->SetName("DragWidget");
SetShadowType(drag_widget->GetNativeView(), wm::SHADOW_TYPE_NONE);
return drag_widget;
}
}
DragImageView::DragImageView(gfx::NativeView context,
ui::DragDropTypes::DragEventSource event_source)
: views::ImageView(),
drag_event_source_(event_source),
touch_drag_operation_(ui::DragDropTypes::DRAG_NONE) {
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_));
}
gfx::Rect DragImageView::GetBoundsInScreen() const {
return widget_->GetWindowBoundsInScreen();
}
void DragImageView::SetWidgetVisible(bool visible) {
if (visible != widget_->IsVisible()) {
if (visible)
widget_->Show();
else
widget_->Hide();
}
}
void DragImageView::SetTouchDragOperationHintOff() {
// Simply set the drag type to non-touch so that no hint is drawn.
drag_event_source_ = ui::DragDropTypes::DRAG_EVENT_SOURCE_MOUSE;
SchedulePaint();
}
void DragImageView::SetTouchDragOperation(int operation) {
if (touch_drag_operation_ == operation)
return;
touch_drag_operation_ = operation;
SchedulePaint();
}
void DragImageView::SetTouchDragOperationHintPosition(
const gfx::Point& position) {
if (touch_drag_operation_indicator_position_ == position)
return;
touch_drag_operation_indicator_position_ = position;
SchedulePaint();
}
void DragImageView::SetOpacity(float visibility) {
DCHECK_GE(visibility, 0.0f);
DCHECK_LE(visibility, 1.0f);
widget_->SetOpacity(static_cast<int>(0xff * visibility));
}
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());
}
// The drag image already has device scale factor applied. But
// |widget_size_| is in DIP units.
gfx::Size scaled_widget_size =
gfx::ScaleToRoundedSize(widget_size_, device_scale);
gfx::ImageSkiaRep image_rep = GetImage().GetRepresentation(device_scale);
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));
canvas->DrawImageInt(image_skia, 0, 0);
}
if (drag_event_source_ != ui::DragDropTypes::DRAG_EVENT_SOURCE_TOUCH)
return;
gfx::Image* drag_hint = DragHint();
if (drag_hint->IsEmpty())
return;
// Make sure drag hint image is positioned within the widget.
gfx::Size drag_hint_size = drag_hint->Size();
gfx::Point drag_hint_position = touch_drag_operation_indicator_position_;
drag_hint_position.Offset(-drag_hint_size.width() / 2, 0);
gfx::Rect drag_hint_bounds(drag_hint_position, drag_hint_size);
drag_hint_bounds.AdjustToFit(gfx::Rect(widget_size_));
// Draw image.
canvas->DrawImageInt(*(drag_hint->ToImageSkia()), drag_hint_bounds.x(),
drag_hint_bounds.y());
}
gfx::Image* DragImageView::DragHint() const {
// Select appropriate drag hint.
gfx::Image* drag_hint =
&ui::ResourceBundle::GetSharedInstance().GetImageNamed(
IDR_TOUCH_DRAG_TIP_NODROP);
if (touch_drag_operation_ & ui::DragDropTypes::DRAG_COPY) {
drag_hint = &ui::ResourceBundle::GetSharedInstance().GetImageNamed(
IDR_TOUCH_DRAG_TIP_COPY);
} else if (touch_drag_operation_ & ui::DragDropTypes::DRAG_MOVE) {
drag_hint = &ui::ResourceBundle::GetSharedInstance().GetImageNamed(
IDR_TOUCH_DRAG_TIP_MOVE);
} else if (touch_drag_operation_ & ui::DragDropTypes::DRAG_LINK) {
drag_hint = &ui::ResourceBundle::GetSharedInstance().GetImageNamed(
IDR_TOUCH_DRAG_TIP_LINK);
}
return drag_hint;
}
void DragImageView::Layout() {
View::Layout();
gfx::Image* drag_hint = DragHint();
if (drag_hint->IsEmpty())
return;
gfx::Size drag_hint_size = drag_hint->Size();
// Enlarge widget if required to fit the drag hint image.
if (drag_hint_size.width() > widget_size_.width() ||
drag_hint_size.height() > widget_size_.height()) {
gfx::Size new_widget_size = widget_size_;
new_widget_size.SetToMax(drag_hint_size);
widget_->SetSize(new_widget_size);
}
}
} // namespace ash
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