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// Copyright 2021 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_SCROLLBAR_SCROLL_BAR_BUTTON_H_
#define UI_VIEWS_CONTROLS_SCROLLBAR_SCROLL_BAR_BUTTON_H_
#include "ui/base/metadata/metadata_header_macros.h"
#include "ui/events/event.h"
#include "ui/gfx/geometry/size.h"
#include "ui/native_theme/native_theme.h"
#include "ui/views/controls/button/button.h"
#include "ui/views/repeat_controller.h"
#include "ui/views/views_export.h"
namespace base {
class TickClock;
}
namespace gfx {
class Canvas;
}
namespace views {
// A button that activates on mouse pressed rather than released, and that
// continues to fire the clicked action as the mouse button remains pressed
// down on the button.
class VIEWS_EXPORT ScrollBarButton : public Button {
METADATA_HEADER(ScrollBarButton, Button)
public:
enum class Type {
kUp,
kDown,
kLeft,
kRight,
};
ScrollBarButton(PressedCallback callback,
Type type,
const base::TickClock* tick_clock = nullptr);
ScrollBarButton(const ScrollBarButton&) = delete;
ScrollBarButton& operator=(const ScrollBarButton&) = delete;
~ScrollBarButton() override;
gfx::Size CalculatePreferredSize(
const SizeBounds& /*available_size*/) const override;
protected:
// Button
bool OnMousePressed(const ui::MouseEvent& event) override;
void OnMouseReleased(const ui::MouseEvent& event) override;
void OnMouseCaptureLost() override;
void OnThemeChanged() override;
void PaintButtonContents(gfx::Canvas* canvas) override;
private:
ui::NativeTheme::ExtraParams GetNativeThemeParams() const;
ui::NativeTheme::Part GetNativeThemePart() const;
ui::NativeTheme::State GetNativeThemeState() const;
void RepeaterNotifyClick();
Type type_;
// The repeat controller that we use to repeatedly click the button when the
// mouse button is down.
RepeatController repeater_;
};
} // namespace views
#endif // UI_VIEWS_CONTROLS_SCROLLBAR_SCROLL_BAR_BUTTON_H_
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