third_party/WebKit/Source/core/layout/LayoutScrollbarTheme.h

   1 /*
   2  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef LayoutScrollbarTheme_h
  27 #define LayoutScrollbarTheme_h
  28
  29 #include "platform/scroll/ScrollbarTheme.h"
  30
  31 namespace blink {
  32
  33 class PlatformMouseEvent;
  34
  35 class LayoutScrollbarTheme final : public ScrollbarTheme {
  36 public:
  37     ~LayoutScrollbarTheme() override { }
  38
  39     int scrollbarThickness(ScrollbarControlSize controlSize) override { return ScrollbarTheme::theme()->scrollbarThickness(controlSize); }
  40
  41     ScrollbarButtonsPlacement buttonsPlacement() const override { return ScrollbarTheme::theme()->buttonsPlacement(); }
  42
  43     void paintScrollCorner(GraphicsContext*, const DisplayItemClientWrapper&, const IntRect& cornerRect) override;
  44
  45     bool shouldCenterOnThumb(ScrollbarThemeClient* scrollbar, const PlatformMouseEvent& event) override { return ScrollbarTheme::theme()->shouldCenterOnThumb(scrollbar, event); }
  46     bool shouldSnapBackToDragOrigin(ScrollbarThemeClient* scrollbar, const PlatformMouseEvent& event) override { return ScrollbarTheme::theme()->shouldSnapBackToDragOrigin(scrollbar, event); }
  47
  48     double initialAutoscrollTimerDelay() override { return ScrollbarTheme::theme()->initialAutoscrollTimerDelay(); }
  49     double autoscrollTimerDelay() override { return ScrollbarTheme::theme()->autoscrollTimerDelay(); }
  50
  51     void registerScrollbar(ScrollbarThemeClient* scrollbar) override { return ScrollbarTheme::theme()->registerScrollbar(scrollbar); }
  52     void unregisterScrollbar(ScrollbarThemeClient* scrollbar) override { return ScrollbarTheme::theme()->unregisterScrollbar(scrollbar); }
  53
  54     int minimumThumbLength(ScrollbarThemeClient*) override;
  55
  56     void buttonSizesAlongTrackAxis(ScrollbarThemeClient*, int& beforeSize, int& afterSize);
  57
  58     static LayoutScrollbarTheme* layoutScrollbarTheme();
  59
  60 protected:
  61     bool hasButtons(ScrollbarThemeClient*) override;
  62     bool hasThumb(ScrollbarThemeClient*) override;
  63
  64     IntRect backButtonRect(ScrollbarThemeClient*, ScrollbarPart, bool painting = false) override;
  65     IntRect forwardButtonRect(ScrollbarThemeClient*, ScrollbarPart, bool painting = false) override;
  66     IntRect trackRect(ScrollbarThemeClient*, bool painting = false) override;
  67
  68     void paintScrollbarBackground(GraphicsContext*, ScrollbarThemeClient*) override;
  69     void paintTrackBackground(GraphicsContext*, ScrollbarThemeClient*, const IntRect&) override;
  70     void paintTrackPiece(GraphicsContext*, ScrollbarThemeClient*, const IntRect&, ScrollbarPart) override;
  71     void paintButton(GraphicsContext*, ScrollbarThemeClient*, const IntRect&, ScrollbarPart) override;
  72     void paintThumb(GraphicsContext*, ScrollbarThemeClient*, const IntRect&) override;
  73     void paintTickmarks(GraphicsContext*, ScrollbarThemeClient*, const IntRect&) override;
  74
  75     IntRect constrainTrackRectToTrackPieces(ScrollbarThemeClient*, const IntRect&) override;
  76 };
  77
  78 } // namespace blink
  79
  80 #endif // LayoutScrollbarTheme_h