third_party/WebKit/Source/platform/scroll/ScrollbarThemeAura.h

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#ifndef ScrollbarThemeAura_h
#define ScrollbarThemeAura_h

#include "base/gtest_prod_util.h"
#include "platform/scroll/ScrollbarTheme.h"

namespace blink {

class PLATFORM_EXPORT ScrollbarThemeAura : public ScrollbarTheme {
public:
    int scrollbarThickness(ScrollbarControlSize) override;

protected:
    bool hasButtons(const ScrollbarThemeClient&) override { return true; }
    bool hasThumb(const ScrollbarThemeClient&) override;

    IntRect backButtonRect(const ScrollbarThemeClient&, ScrollbarPart, bool painting = false) override;
    IntRect forwardButtonRect(const ScrollbarThemeClient&, ScrollbarPart, bool painting = false) override;
    IntRect trackRect(const ScrollbarThemeClient&, bool painting = false) override;
    int minimumThumbLength(const ScrollbarThemeClient&) override;

    void paintTickmarks(GraphicsContext&, const Scrollbar&, const IntRect&) override;
    void paintTrackBackground(GraphicsContext&, const Scrollbar&, const IntRect&) override;
    void paintTrackPiece(GraphicsContext&, const Scrollbar&, const IntRect&, ScrollbarPart) override;
    void paintButton(GraphicsContext&, const Scrollbar&, const IntRect&, ScrollbarPart) override;
    void paintThumb(GraphicsContext&, const Scrollbar&, const IntRect&) override;

    bool shouldRepaintAllPartsOnInvalidation() const override;
    ScrollbarPart invalidateOnThumbPositionChange(const ScrollbarThemeClient&, float oldPosition, float newPosition) const override;

private:
    FRIEND_TEST_ALL_PREFIXES(ScrollbarThemeAuraTest, ButtonSizeHorizontal);
    FRIEND_TEST_ALL_PREFIXES(ScrollbarThemeAuraTest, ButtonSizeVertical);
    FRIEND_TEST_ALL_PREFIXES(ScrollbarThemeAuraTest, NoButtonsReturnsSize0);

    virtual bool hasScrollbarButtons(ScrollbarOrientation) const;
    IntSize buttonSize(const ScrollbarThemeClient&);
};

} // namespace blink

#endif