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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// 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_BITMAP_SCROLL_BAR_H_
#define UI_VIEWS_CONTROLS_SCROLLBAR_BITMAP_SCROLL_BAR_H_
#include "ui/views/controls/scrollbar/base_scroll_bar.h"
namespace views {
namespace {
class BitmapScrollBarThumb;
}
///////////////////////////////////////////////////////////////////////////////
//
// BitmapScrollBar
//
// A ScrollBar subclass that implements a scroll bar rendered using images
// that the user provides. There are images for the up and down buttons, as
// well as for the thumb and track. This is intended for creating UIs that
// have customized, non-native appearances, like floating HUDs etc.
//
///////////////////////////////////////////////////////////////////////////////
class VIEWS_EXPORT BitmapScrollBar : public BaseScrollBar,
public ButtonListener {
public:
BitmapScrollBar(bool horizontal, bool show_scroll_buttons);
virtual ~BitmapScrollBar() { }
// A list of parts that the user may supply images for.
enum ScrollBarPart {
// The button used to represent scrolling up/left by 1 line.
PREV_BUTTON = 0,
// The button used to represent scrolling down/right by 1 line.
// IMPORTANT: The code assumes the prev and next
// buttons have equal width and equal height.
NEXT_BUTTON,
// The top/left segment of the thumb on the scrollbar.
THUMB_START_CAP,
// The tiled background image of the thumb.
THUMB_MIDDLE,
// The bottom/right segment of the thumb on the scrollbar.
THUMB_END_CAP,
// The grippy that is rendered in the center of the thumb.
THUMB_GRIPPY,
// The tiled background image of the thumb track.
THUMB_TRACK,
PART_COUNT
};
// Sets the image to be rendered for the specified part and state.
void SetImage(ScrollBarPart part,
CustomButton::ButtonState state,
gfx::ImageSkia* image_skia);
gfx::Rect GetTrackBounds() const;
protected:
// View overrides:
virtual gfx::Size GetPreferredSize() OVERRIDE;
virtual void Layout() OVERRIDE;
virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
// ScrollBar overrides:
virtual int GetLayoutSize() const OVERRIDE;
// BaseButton::ButtonListener overrides:
virtual void ButtonPressed(Button* sender,
const ui::Event& event) OVERRIDE;
private:
// Up/Down/Left/Right buttons.
ImageButton* prev_button_;
ImageButton* next_button_;
// The thumb needs to be able to access the part images.
friend BitmapScrollBarThumb;
gfx::ImageSkia* images_[PART_COUNT][CustomButton::STATE_COUNT];
// True if the scroll buttons at each end of the scroll bar should be shown.
bool show_scroll_buttons_;
DISALLOW_COPY_AND_ASSIGN(BitmapScrollBar);
};
} // namespace views
#endif // UI_VIEWS_CONTROLS_SCROLLBAR_BITMAP_SCROLL_BAR_H_
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