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// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_VIEWS_CONTROLS_RESIZE_AREA_H_
#define UI_VIEWS_CONTROLS_RESIZE_AREA_H_
#include "base/memory/raw_ptr.h"
#include "ui/views/view.h"
namespace views {
class ResizeAreaDelegate;
// An invisible area that acts like a horizontal resizer.
class VIEWS_EXPORT ResizeArea : public View {
METADATA_HEADER(ResizeArea, View)
public:
explicit ResizeArea(ResizeAreaDelegate* delegate);
ResizeArea(const ResizeArea&) = delete;
ResizeArea& operator=(const ResizeArea&) = delete;
~ResizeArea() override;
// views::View:
ui::Cursor GetCursor(const ui::MouseEvent& event) override;
void OnGestureEvent(ui::GestureEvent* event) override;
bool OnMousePressed(const ui::MouseEvent& event) override;
bool OnMouseDragged(const ui::MouseEvent& event) override;
void OnMouseReleased(const ui::MouseEvent& event) override;
void OnMouseCaptureLost() override;
// Returns true if a resize has been reported to the delegate but the
// |last_update| resize has not yet been reported. For example, if a mouse
// drag has happened but the mouse has not yet been released.
bool is_resizing() { return is_resizing_; }
private:
// Report the amount the user resized by to the delegate, accounting for
// directionality.
void ReportResizeAmount(int resize_amount, bool last_update);
// Converts |event_x| to screen coordinates and sets |initial_position_| to
// this value.
void SetInitialPosition(int event_x);
// The delegate to notify when we have updates.
raw_ptr<ResizeAreaDelegate> delegate_;
bool is_resizing_ = false;
// The event's x-position at the start of the resize operation. The resize
// area will move while being dragged, so |initial_position_| is represented
// in screen coordinates so that we don't lose our bearings.
int initial_position_ = 0;
};
} // namespace views
#endif // UI_VIEWS_CONTROLS_RESIZE_AREA_H_
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