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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 "ui/views/button_drag_utils.h"
#include <memory>
#include <utility>
#include "base/memory/raw_ptr.h"
#include "base/strings/utf_string_conversions.h"
#include "ui/base/dragdrop/os_exchange_data.h"
#include "ui/base/metadata/metadata_header_macros.h"
#include "ui/base/metadata/metadata_impl_macros.h"
#include "ui/base/models/image_model.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/color/color_id.h"
#include "ui/color/color_provider.h"
#include "ui/compositor/canvas_painter.h"
#include "ui/compositor/compositor.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/geometry/vector2d.h"
#include "ui/gfx/image/image.h"
#include "ui/resources/grit/ui_resources.h"
#include "ui/views/background.h"
#include "ui/views/border.h"
#include "ui/views/controls/button/label_button.h"
#include "ui/views/controls/button/label_button_border.h"
#include "ui/views/drag_utils.h"
#include "ui/views/paint_info.h"
#include "ui/views/widget/widget.h"
#include "url/gurl.h"
namespace {
class DragContentsButton : public views::LabelButton {
METADATA_HEADER(DragContentsButton, views::LabelButton)
public:
DragContentsButton(PressedCallback callback, std::u16string title)
: LabelButton(std::move(callback), title) {
#if BUILDFLAG(IS_WIN)
// For windows, label button paints icon to a layer by default, which
// causes the drag image to not render correctly. Disable this behavior.
// This is a workaround for crbug.com/394380766
image_container_view()->DestroyLayer();
#endif
}
~DragContentsButton() override = default;
};
BEGIN_METADATA(DragContentsButton)
END_METADATA
} // namespace
namespace button_drag_utils {
// Maximum width of the link drag image in pixels.
static constexpr int kLinkDragImageMaxWidth = 150;
class ScopedWidget {
public:
explicit ScopedWidget(std::unique_ptr<views::Widget> widget)
: widget_(std::move(widget)) {}
ScopedWidget(const ScopedWidget&) = delete;
ScopedWidget& operator=(const ScopedWidget&) = delete;
~ScopedWidget() = default;
views::Widget* operator->() const { return widget_.get(); }
views::Widget* get() const { return widget_.get(); }
private:
std::unique_ptr<views::Widget> widget_;
};
void SetURLAndDragImage(const GURL& url,
const std::u16string& title,
const gfx::ImageSkia& icon,
const gfx::Point* press_pt,
ui::OSExchangeData* data) {
DCHECK(url.is_valid());
DCHECK(data);
data->SetURL(url, title);
SetDragImage(url, title, icon, press_pt, data);
}
void SetDragImage(const GURL& url,
const std::u16string& title,
const gfx::ImageSkia& icon,
const gfx::Point* press_pt,
ui::OSExchangeData* data,
std::optional<int> icon_label_spacing_override) {
// Create a widget to render the drag image for us.
ScopedWidget drag_widget(std::make_unique<views::Widget>());
views::Widget::InitParams params(
views::Widget::InitParams::CLIENT_OWNS_WIDGET,
views::Widget::InitParams::TYPE_DRAG);
params.accept_events = false;
params.shadow_type = views::Widget::InitParams::ShadowType::kNone;
params.opacity = views::Widget::InitParams::WindowOpacity::kTranslucent;
drag_widget->Init(std::move(params));
// Create a button to render the drag image for us.
DragContentsButton* button =
drag_widget->SetContentsView(std::make_unique<DragContentsButton>(
views::Button::PressedCallback(),
title.empty() ? base::UTF8ToUTF16(url.spec()) : title));
button->SetTextSubpixelRenderingEnabled(false);
const ui::ColorProvider* color_provider = drag_widget->GetColorProvider();
button->SetTextColor(views::Button::STATE_NORMAL,
ui::kColorTextfieldForeground);
SkColor bg_color = color_provider->GetColor(ui::kColorTextfieldBackground);
if (views::Widget::IsWindowCompositingSupported()) {
button->SetTextShadows(gfx::ShadowValues(
10, gfx::ShadowValue(gfx::Vector2d(0, 0), 2.0f, bg_color)));
} else {
button->SetBackground(views::CreateSolidBackground(bg_color));
button->SetBorder(button->CreateDefaultBorder());
}
button->SetMaxSize(gfx::Size(kLinkDragImageMaxWidth, 0));
if (icon.isNull()) {
button->SetImageModel(views::Button::STATE_NORMAL,
ui::ImageModel::FromResourceId(IDR_DEFAULT_FAVICON));
} else {
button->SetImageModel(views::Button::STATE_NORMAL,
ui::ImageModel::FromImageSkia(icon));
}
if (icon_label_spacing_override.has_value()) {
button->SetImageLabelSpacing(icon_label_spacing_override.value());
}
gfx::Size size(button->GetPreferredSize({}));
// drag_widget's size must be set to show the drag image in RTL.
// However, on Windows, calling Widget::SetSize() resets
// the LabelButton's bounds via OnNativeWidgetSizeChanged().
// Therefore, call button->SetBoundsRect() after drag_widget->SetSize().
drag_widget->SetSize(size);
button->SetBoundsRect(gfx::Rect(size));
gfx::Vector2d press_point;
if (press_pt) {
press_point = press_pt->OffsetFromOrigin();
} else {
press_point = gfx::Vector2d(size.width() / 2, size.height() / 2);
}
SkBitmap bitmap;
float raster_scale = ScaleFactorForDragFromWidget(drag_widget.get());
SkColor color = SK_ColorTRANSPARENT;
button->Paint(views::PaintInfo::CreateRootPaintInfo(
ui::CanvasPainter(&bitmap, size, raster_scale, color,
true /* is_pixel_canvas */)
.context(),
size));
gfx::ImageSkia image = gfx::ImageSkia::CreateFromBitmap(bitmap, raster_scale);
data->provider().SetDragImage(image, press_point);
}
} // namespace button_drag_utils
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