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// Copyright 2012 The Chromium Authors
// 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 <memory>
#include "ash/public/cpp/shell_window_ids.h"
#include "base/memory/ptr_util.h"
#include "skia/ext/image_operations.h"
#include "ui/aura/window.h"
#include "ui/base/dragdrop/drag_drop_types.h"
#include "ui/base/dragdrop/mojom/drag_drop_types.mojom-shared.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/display/display.h"
#include "ui/display/screen.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/image/image_skia_rep.h"
#include "ui/resources/grit/ui_resources.h"
#include "ui/views/widget/widget.h"
namespace ash {
DragImageView::DragImageView(ui::mojom::DragEventSource event_source)
: drag_event_source_(event_source) {}
DragImageView::~DragImageView() = default;
// static
std::unique_ptr<views::Widget> DragImageView::Create(
aura::Window* root_window,
ui::mojom::DragEventSource event_source) {
views::Widget::InitParams params(
views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET,
views::Widget::InitParams::TYPE_TOOLTIP);
params.name = "DragWidget";
params.accept_events = false;
params.shadow_type = views::Widget::InitParams::ShadowType::kNone;
params.opacity = views::Widget::InitParams::WindowOpacity::kTranslucent;
params.parent =
root_window->GetChildById(kShellWindowId_DragImageAndTooltipContainer);
if (!params.parent)
params.context = root_window; // Happens in tests.
auto drag_widget = std::make_unique<views::Widget>(std::move(params));
drag_widget->SetOpacity(1.f);
drag_widget->SetContentsView(
base::WrapUnique(new DragImageView(event_source)));
return drag_widget;
}
void DragImageView::SetBoundsInScreen(const gfx::Rect& bounds) {
drag_image_size_ = bounds.size();
GetWidget()->SetBounds(bounds);
}
void DragImageView::SetScreenPosition(const gfx::Point& position) {
GetWidget()->SetBounds(
gfx::Rect(position, GetWidget()->GetWindowBoundsInScreen().size()));
}
gfx::Rect DragImageView::GetBoundsInScreen() const {
return GetWidget()->GetWindowBoundsInScreen();
}
void DragImageView::SetWidgetVisible(bool visible) {
auto* widget = GetWidget();
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::mojom::DragEventSource::kMouse;
// This disables the drag hint image. This should reduce the widget size if
// the drag image is smaller than the drag hint image, so we set new bounds.
gfx::Rect new_bounds = GetBoundsInScreen();
new_bounds.set_size(drag_image_size_);
SetBoundsInScreen(new_bounds);
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);
GetWidget()->SetOpacity(visibility);
}
void DragImageView::OnPaint(gfx::Canvas* canvas) {
if (GetImage().isNull())
return;
// |drag_image_size_| is in DIP.
// ImageSkia::size() also returns the size in DIP.
if (GetImage().size() == drag_image_size_) {
canvas->DrawImageInt(GetImage(), 0, 0);
} else {
aura::Window* window = GetWidget()->GetNativeWindow();
const float device_scale = display::Screen::GetScreen()
->GetDisplayNearestWindow(window)
.device_scale_factor();
// The drag image already has device scale factor applied. But
// |drag_image_size_| is in DIP units.
gfx::Size drag_image_size_pixels =
gfx::ScaleToRoundedSize(drag_image_size_, device_scale);
gfx::ImageSkiaRep image_rep = GetImage().GetRepresentation(device_scale);
if (image_rep.is_null())
return;
SkBitmap scaled = skia::ImageOperations::Resize(
image_rep.GetBitmap(), skia::ImageOperations::RESIZE_LANCZOS3,
drag_image_size_pixels.width(), drag_image_size_pixels.height());
gfx::ImageSkia image_skia =
gfx::ImageSkia::CreateFromBitmap(scaled, device_scale);
canvas->DrawImageInt(image_skia, 0, 0);
}
gfx::Image* drag_hint = DragHint();
if (!ShouldDrawDragHint() || 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);
gfx::Size widget_size = GetWidget()->GetWindowBoundsInScreen().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;
}
bool DragImageView::ShouldDrawDragHint() const {
return drag_event_source_ == ui::mojom::DragEventSource::kTouch;
}
gfx::Size DragImageView::GetMinimumSize() const {
gfx::Size minimum_size = drag_image_size_;
if (ShouldDrawDragHint())
minimum_size.SetToMax(DragHint()->Size());
return minimum_size;
}
void DragImageView::Layout(PassKey) {
LayoutSuperclass<View>(this);
// Only consider resizing the widget for the drag hint image if we are in a
// touch initiated drag.
gfx::Image* drag_hint = DragHint();
if (!ShouldDrawDragHint() || drag_hint->IsEmpty())
return;
gfx::Size drag_hint_size = drag_hint->Size();
// Enlarge widget if required to fit the drag hint image.
gfx::Size widget_size = GetWidget()->GetWindowBoundsInScreen().size();
if (drag_hint_size.width() > widget_size.width() ||
drag_hint_size.height() > widget_size.height()) {
widget_size.SetToMax(drag_hint_size);
GetWidget()->SetSize(widget_size);
}
}
} // namespace ash
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