src/third_party/WebKit/Source/platform/scroll/ScrollbarThemeGtkOrAura.cpp

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  30
  31 #include "config.h"
  32 #include "platform/scroll/ScrollbarThemeGtkOrAura.h"
  33
  34 #include "RuntimeEnabledFeatures.h"
  35 #include "platform/LayoutTestSupport.h"
  36 #include "platform/PlatformMouseEvent.h"
  37 #include "platform/graphics/GraphicsContext.h"
  38 #include "platform/scroll/ScrollbarThemeClient.h"
  39 #include "platform/scroll/ScrollbarThemeOverlay.h"
  40 #include "public/platform/Platform.h"
  41 #include "public/platform/WebRect.h"
  42 #include "public/platform/WebThemeEngine.h"
  43
  44 namespace WebCore {
  45
  46 static bool useMockTheme()
  47 {
  48     return isRunningLayoutTest();
  49 }
  50
  51 ScrollbarTheme* ScrollbarTheme::nativeTheme()
  52 {
  53     if (RuntimeEnabledFeatures::overlayScrollbarsEnabled()) {
  54         DEFINE_STATIC_LOCAL(ScrollbarThemeOverlay, theme, (10, 0, ScrollbarThemeOverlay::AllowHitTest));
  55         return &theme;
  56     }
  57
  58     DEFINE_STATIC_LOCAL(ScrollbarThemeGtkOrAura, theme, ());
  59     return &theme;
  60 }
  61
  62 int ScrollbarThemeGtkOrAura::scrollbarThickness(ScrollbarControlSize controlSize)
  63 {
  64     // Horiz and Vert scrollbars are the same thickness.
  65     // In unit tests we don't have the mock theme engine (because of layering violations), so we hard code the size (see bug 327470).
  66     if (useMockTheme())
  67         return 15;
  68     IntSize scrollbarSize = blink::Platform::current()->themeEngine()->getSize(blink::WebThemeEngine::PartScrollbarVerticalTrack);
  69     return scrollbarSize.width();
  70 }
  71
  72 void ScrollbarThemeGtkOrAura::paintTrackPiece(GraphicsContext* gc, ScrollbarThemeClient* scrollbar, const IntRect& rect, ScrollbarPart partType)
  73 {
  74     blink::WebThemeEngine::State state = scrollbar->hoveredPart() == partType ? blink::WebThemeEngine::StateHover : blink::WebThemeEngine::StateNormal;
  75
  76     if (useMockTheme() && !scrollbar->enabled())
  77         state = blink::WebThemeEngine::StateDisabled;
  78
  79     IntRect alignRect = trackRect(scrollbar, false);
  80     blink::WebThemeEngine::ExtraParams extraParams;
  81     blink::WebCanvas* canvas = gc->canvas();
  82     extraParams.scrollbarTrack.isBack = (partType == BackTrackPart);
  83     extraParams.scrollbarTrack.trackX = alignRect.x();
  84     extraParams.scrollbarTrack.trackY = alignRect.y();
  85     extraParams.scrollbarTrack.trackWidth = alignRect.width();
  86     extraParams.scrollbarTrack.trackHeight = alignRect.height();
  87     blink::Platform::current()->themeEngine()->paint(canvas, scrollbar->orientation() == HorizontalScrollbar ? blink::WebThemeEngine::PartScrollbarHorizontalTrack : blink::WebThemeEngine::PartScrollbarVerticalTrack, state, blink::WebRect(rect), &extraParams);
  88 }
  89
  90 void ScrollbarThemeGtkOrAura::paintButton(GraphicsContext* gc, ScrollbarThemeClient* scrollbar, const IntRect& rect, ScrollbarPart part)
  91 {
  92     blink::WebThemeEngine::Part paintPart;
  93     blink::WebThemeEngine::State state = blink::WebThemeEngine::StateNormal;
  94     blink::WebCanvas* canvas = gc->canvas();
  95     bool checkMin = false;
  96     bool checkMax = false;
  97
  98     if (scrollbar->orientation() == HorizontalScrollbar) {
  99         if (part == BackButtonStartPart) {
 100             paintPart = blink::WebThemeEngine::PartScrollbarLeftArrow;
 101             checkMin = true;
 102         } else if (useMockTheme() && part != ForwardButtonEndPart) {
 103             return;
 104         } else {
 105             paintPart = blink::WebThemeEngine::PartScrollbarRightArrow;
 106             checkMax = true;
 107         }
 108     } else {
 109         if (part == BackButtonStartPart) {
 110             paintPart = blink::WebThemeEngine::PartScrollbarUpArrow;
 111             checkMin = true;
 112         } else if (useMockTheme() && part != ForwardButtonEndPart) {
 113             return;
 114         } else {
 115             paintPart = blink::WebThemeEngine::PartScrollbarDownArrow;
 116             checkMax = true;
 117         }
 118     }
 119     if (useMockTheme() && !scrollbar->enabled()) {
 120         state = blink::WebThemeEngine::StateDisabled;
 121     } else if (!useMockTheme() && ((checkMin && (scrollbar->currentPos() <= 0))
 122         || (checkMax && scrollbar->currentPos() >= scrollbar->maximum()))) {
 123         state = blink::WebThemeEngine::StateDisabled;
 124     } else {
 125         if (part == scrollbar->pressedPart())
 126             state = blink::WebThemeEngine::StatePressed;
 127         else if (part == scrollbar->hoveredPart())
 128             state = blink::WebThemeEngine::StateHover;
 129     }
 130     blink::Platform::current()->themeEngine()->paint(canvas, paintPart, state, blink::WebRect(rect), 0);
 131 }
 132
 133 void ScrollbarThemeGtkOrAura::paintThumb(GraphicsContext* gc, ScrollbarThemeClient* scrollbar, const IntRect& rect)
 134 {
 135     blink::WebThemeEngine::State state;
 136     blink::WebCanvas* canvas = gc->canvas();
 137     if (scrollbar->pressedPart() == ThumbPart)
 138         state = blink::WebThemeEngine::StatePressed;
 139     else if (scrollbar->hoveredPart() == ThumbPart)
 140         state = blink::WebThemeEngine::StateHover;
 141     else
 142         state = blink::WebThemeEngine::StateNormal;
 143     blink::Platform::current()->themeEngine()->paint(canvas, scrollbar->orientation() == HorizontalScrollbar ? blink::WebThemeEngine::PartScrollbarHorizontalThumb : blink::WebThemeEngine::PartScrollbarVerticalThumb, state, blink::WebRect(rect), 0);
 144 }
 145
 146 IntSize ScrollbarThemeGtkOrAura::buttonSize(ScrollbarThemeClient* scrollbar)
 147 {
 148     if (scrollbar->orientation() == VerticalScrollbar) {
 149         IntSize size = blink::Platform::current()->themeEngine()->getSize(blink::WebThemeEngine::PartScrollbarUpArrow);
 150         return IntSize(size.width(), scrollbar->height() < 2 * size.height() ? scrollbar->height() / 2 : size.height());
 151     }
 152
 153     // HorizontalScrollbar
 154     IntSize size = blink::Platform::current()->themeEngine()->getSize(blink::WebThemeEngine::PartScrollbarLeftArrow);
 155     return IntSize(scrollbar->width() < 2 * size.width() ? scrollbar->width() / 2 : size.width(), size.height());
 156 }
 157
 158 int ScrollbarThemeGtkOrAura::minimumThumbLength(ScrollbarThemeClient* scrollbar)
 159 {
 160     if (scrollbar->orientation() == VerticalScrollbar) {
 161         IntSize size = blink::Platform::current()->themeEngine()->getSize(blink::WebThemeEngine::PartScrollbarVerticalThumb);
 162         return size.height();
 163     }
 164
 165     IntSize size = blink::Platform::current()->themeEngine()->getSize(blink::WebThemeEngine::PartScrollbarHorizontalThumb);
 166     return size.width();
 167 }
 168
 169 } // namespace WebCore