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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_UI_VIEWS_FRAME_MULTI_CONTENTS_DROP_TARGET_VIEW_H_
#define CHROME_BROWSER_UI_VIEWS_FRAME_MULTI_CONTENTS_DROP_TARGET_VIEW_H_
#include "base/memory/raw_ptr.h"
#include "ui/base/interaction/element_identifier.h"
#include "ui/base/metadata/metadata_header_macros.h"
#include "ui/gfx/animation/slide_animation.h"
#include "ui/views/animation/animation_delegate_views.h"
#include "ui/views/view.h"
namespace views {
class ImageView;
} // namespace views
// MultiContentsDropTargetView shows a drop target view used for the drag and
// drop link interaction to create a split view.
class MultiContentsDropTargetView : public views::View,
public views::AnimationDelegateViews {
METADATA_HEADER(MultiContentsDropTargetView, views::View)
public:
DECLARE_CLASS_ELEMENT_IDENTIFIER_VALUE(kMultiContentsDropTargetElementId);
// Represents which edge of the contents area the drop target is on.
enum class DropSide {
START = 0,
END = 1,
};
class DropDelegate {
public:
virtual ~DropDelegate() = default;
// Handles links that are dropped on the view.
virtual void HandleLinkDrop(DropSide side,
const std::vector<GURL>& urls) = 0;
};
explicit MultiContentsDropTargetView(DropDelegate& drop_delegate);
MultiContentsDropTargetView(const MultiContentsDropTargetView&) = delete;
MultiContentsDropTargetView& operator=(const MultiContentsDropTargetView&) =
delete;
~MultiContentsDropTargetView() override;
double GetAnimationValue() const;
void Show(DropSide side);
void Hide();
bool IsClosing() const;
// Returns the preferred width of this view, considering animation progress.
int GetPreferredWidth() const;
// views::View
void SetVisible(bool visible) override;
void OnThemeChanged() override;
bool GetDropFormats(int* formats,
std::set<ui::ClipboardFormatType>* format_types) override;
bool CanDrop(const ui::OSExchangeData& data) override;
int OnDragUpdated(const ui::DropTargetEvent& event) override;
void OnDragExited() override;
void OnDragDone() override;
views::View::DropCallback GetDropCallback(
const ui::DropTargetEvent& event) override;
// views::AnimationDelegateViews:
void AnimationProgressed(const gfx::Animation* animation) override;
void AnimationEnded(const gfx::Animation* animation) override;
std::optional<DropSide> side() const { return side_; }
raw_ptr<views::ImageView> icon_view_for_testing() { return icon_view_; }
gfx::SlideAnimation& animation_for_testing() { return animation_; }
private:
void UpdateVisibility(bool should_be_open);
bool ShouldShowAnimation() const;
void DoDrop(const ui::DropTargetEvent& event,
ui::mojom::DragOperation& output_drag_op,
std::unique_ptr<ui::LayerTreeOwner> drag_image_layer_owner);
// The side that this view is showing on.
std::optional<DropSide> side_ = std::nullopt;
const raw_ref<DropDelegate> drop_delegate_;
// Animation controlling showing and hiding of the drop target view.
gfx::SlideAnimation animation_{this};
raw_ptr<views::View> inner_container_ = nullptr;
raw_ptr<views::ImageView> icon_view_ = nullptr;
};
#endif // CHROME_BROWSER_UI_VIEWS_FRAME_MULTI_CONTENTS_DROP_TARGET_VIEW_H_
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