widget/ScrollbarDrawingMac.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_widget_ScrollbarDrawing_h
   8 #define mozilla_widget_ScrollbarDrawing_h
   9
  10 #include "nsColor.h"
  11 #include "nsITheme.h"
  12 #include "Units.h"
  13 #include "mozilla/Array.h"
  14
  15 namespace mozilla {
  16 namespace gfx {
  17 class DrawTarget;
  18 }
  19
  20 namespace widget {
  21
  22 struct ScrollbarParams {
  23   bool overlay = false;
  24   bool rolledOver = false;
  25   bool small = false;
  26   bool horizontal = false;
  27   bool rtl = false;
  28   bool onDarkBackground = false;
  29   bool custom = false;
  30   // Two colors only used when custom is true.
  31   nscolor trackColor = NS_RGBA(0, 0, 0, 0);
  32   nscolor faceColor = NS_RGBA(0, 0, 0, 0);
  33 };
  34
  35 class ScrollbarDrawingMac final {
  36  public:
  37   struct FillRect {
  38     gfx::Rect mRect;
  39     nscolor mColor;
  40   };
  41
  42   static CSSIntCoord GetScrollbarSize(StyleScrollbarWidth, bool aOverlay);
  43
  44   static LayoutDeviceIntCoord GetScrollbarSize(StyleScrollbarWidth,
  45                                                bool aOverlay, float aDpiRatio);
  46   static LayoutDeviceIntSize GetMinimumWidgetSize(StyleAppearance aAppearance,
  47                                                   nsIFrame* aFrame,
  48                                                   float aDpiRatio);
  49   static ScrollbarParams ComputeScrollbarParams(nsIFrame* aFrame,
  50                                                 const ComputedStyle& aStyle,
  51                                                 bool aIsHorizontal);
  52
  53   // The caller can draw this rectangle with rounded corners as appropriate.
  54   struct ThumbRect {
  55     gfx::Rect mRect;
  56     nscolor mFillColor;
  57     nscolor mStrokeColor;
  58     float mStrokeWidth;
  59     float mStrokeOutset;
  60   };
  61
  62   static ThumbRect GetThumbRect(const gfx::Rect& aRect,
  63                                 const ScrollbarParams& aParams, float aScale);
  64
  65   using ScrollbarTrackRects = Array<FillRect, 4>;
  66   static bool GetScrollbarTrackRects(const gfx::Rect& aRect,
  67                                      const ScrollbarParams& aParams,
  68                                      float aScale, ScrollbarTrackRects&);
  69
  70   using ScrollCornerRects = Array<FillRect, 7>;
  71   static bool GetScrollCornerRects(const gfx::Rect& aRect,
  72                                    const ScrollbarParams& aParams, float aScale,
  73                                    ScrollCornerRects&);
  74 };
  75
  76 }  // namespace widget
  77 }  // namespace mozilla
  78
  79 #endif