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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_VIEW_DROP_TARGET_CONTROLLER_H_
#define CHROME_BROWSER_UI_VIEWS_FRAME_MULTI_CONTENTS_VIEW_DROP_TARGET_CONTROLLER_H_
#include "base/callback_list.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "chrome/browser/ui/views/frame/multi_contents_drop_target_view.h"
#include "chrome/browser/ui/views/tabs/dragging/tab_drag_controller.h"
#include "ui/base/interaction/element_identifier.h"
#include "ui/views/view.h"
namespace content {
struct DropData;
} // namespace content
// `MultiContentsViewDropTargetController` is responsible for handling
// the drag-entrypoint of a single `MultiContentsView`. This includes dragging
// links, bookmarks, or tab headers to create a split view.
// There exists one `MultiContentsViewDropTargetController` per
// `MultiContentesView`.
class MultiContentsViewDropTargetController final : public TabDragDelegate {
public:
explicit MultiContentsViewDropTargetController(
MultiContentsDropTargetView& drop_target_view);
~MultiContentsViewDropTargetController() override;
MultiContentsViewDropTargetController(
const MultiContentsViewDropTargetController&) = delete;
MultiContentsViewDropTargetController& operator=(
const MultiContentsViewDropTargetController&) = delete;
// TabDragDelegate
void OnTabDragUpdated(TabDragDelegate::DragController& controller,
const gfx::Point& point_in_screen) override;
void OnTabDragEntered() override;
void OnTabDragExited() override;
void OnTabDragEnded() override;
bool CanDropTab() override;
void HandleTabDrop(TabDragDelegate::DragController& controller) override;
base::CallbackListSubscription RegisterWillDestroyCallback(
base::OnceClosure callback) override;
// Handles a drag within the web contents area.
// `point` should be relative to the multi contents view.
void OnWebContentsDragUpdate(const content::DropData& data,
const gfx::PointF& point,
bool is_in_split_view);
void OnWebContentsDragExit();
void OnWebContentsDragEnded();
private:
// Represents a timer for delaying when a specific drop target view is shown.
struct DropTargetShowTimer {
explicit DropTargetShowTimer(
MultiContentsDropTargetView::DropSide drop_side);
base::OneShotTimer timer;
MultiContentsDropTargetView::DropSide drop_side;
};
// Updates the timers for a drag at the given point.
// Assumes the dragged data is droppable (e.g. tab or link).
void HandleDragUpdate(const gfx::PointF& point_in_view);
// Starts or updates a running timer to show `target_to_show`.
void StartOrUpdateDropTargetTimer(
MultiContentsDropTargetView::DropSide drop_side);
void ResetDropTargetTimer();
// Shows the drop target that should be displayed at the end of the delay.
void ShowTimerDelayedDropTarget();
// This timer is used for showing the drop target a delay, and may be
// canceled in case a drag exits the drop area before the target is shown.
std::optional<DropTargetShowTimer> show_drop_target_timer_ = std::nullopt;
// The view that is displayed when drags hover over the "drop" region of
// the content area.
const raw_ref<MultiContentsDropTargetView> drop_target_view_;
const raw_ref<views::View> drop_target_parent_view_;
base::OnceClosureList on_will_destroy_callback_list_;
};
#endif // CHROME_BROWSER_UI_VIEWS_FRAME_MULTI_CONTENTS_VIEW_DROP_TARGET_CONTROLLER_H_
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