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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_TABS_DRAGGING_DRAGGING_TABS_SESSION_H_
#define CHROME_BROWSER_UI_VIEWS_TABS_DRAGGING_DRAGGING_TABS_SESSION_H_
#include "chrome/browser/ui/views/tabs/dragging/drag_session_data.h"
#include "chrome/browser/ui/views/tabs/dragging/tab_drag_context.h"
#include "chrome/browser/ui/views/tabs/dragging/tab_strip_scroll_session.h"
#include "components/tab_groups/tab_group_id.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/geometry/rect.h"
// Handles dragging tabs within a single TabDragContext on behalf of
// TabDragController.
class DraggingTabsSession final : public TabDragWithScrollManager {
public:
// `drag_data` is a copy of the drag configuration for the full session.
// `attached_context` is the context in which the tabs are being dragged.
// `offset_to_width_ratio_` is the desired x offset into the source
// TabSlotView (e.g. 0.5 if the drag started in the center of the tab).
// `initial_move` should be true if the drag session is beginning, and
// the tabs have not been moved from their initial positions.
// `point_in_screen` is the initial cursor screen position.
explicit DraggingTabsSession(DragSessionData drag_data,
TabDragContext* attached_context,
float offset_to_width_ratio_,
bool initial_move,
gfx::Point point_in_screen);
~DraggingTabsSession() final;
// TabDragWithScrollManager:
void MoveAttached(gfx::Point point_in_screen) override;
gfx::Rect GetEnclosingRectForDraggedTabs() override;
gfx::Point GetLastPointInScreen() override;
views::View* GetAttachedContext() override;
views::ScrollView* GetScrollView() override;
private:
void MoveAttachedImpl(gfx::Point point_in_screen, bool just_attached);
// Retrieves the bounds of the dragged tabs relative to the attached
// TabDragContext. `tab_strip_point` is in the attached
// TabDragContext's coordinate system.
gfx::Rect GetDraggedViewTabStripBounds(gfx::Point tab_strip_point) const;
// Returns true if the tabs were originally one after the other in
// `source_context_`.
bool AreTabsConsecutive() const;
// Helper method for TabDragController::MoveAttached to precompute the tab
// group membership of selected tabs after performing the move.
std::optional<tab_groups::TabGroupId> CalculateGroupForDraggedTabs(
int to_index);
// Calculates where to position the dragged tabs, given the cursor is at
// `point_in_screen`. Keeps the same point within the source view under the
// cursor, unless that would push tabs outside the drag area.
gfx::Point GetAttachedDragPoint(gfx::Point point_in_screen);
// Data about the tabs and groups being dragged.
const DragSessionData drag_data_;
// The context in which `this` will drag tabs.
const raw_ptr<TabDragContext> attached_context_;
// This is the horizontal offset of the mouse from the leading edge of the
// first tab where dragging began. This is used to ensure that the dragged
// tabs are always positioned at the correct location during the drag.
const int mouse_offset_;
// True if MoveAttached() has never been called, and `attached_context_` is
// the source context in which the drag originated.
bool initial_move_;
// The horizontal position of the mouse cursor in `attached_context_`
// coordinates at the time of the last re-order event.
int last_move_attached_context_loc_;
gfx::Point last_point_in_screen_;
// the scrolling session that handles scrolling when the tabs are dragged
// to the scrollable regions of the tab_strip.
std::unique_ptr<TabStripScrollSession> tab_strip_scroll_session_ = nullptr;
};
#endif // CHROME_BROWSER_UI_VIEWS_TABS_DRAGGING_DRAGGING_TABS_SESSION_H_
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