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      1 /*
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      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
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      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
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     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
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     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "platform/scroll/ScrollbarThemeAura.h"
     33 
     34 #include "platform/LayoutTestSupport.h"
     35 #include "platform/PlatformMouseEvent.h"
     36 #include "platform/RuntimeEnabledFeatures.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(ScrollbarThemeAura, theme, ());
     59     return &theme;
     60 }
     61 
     62 int ScrollbarThemeAura::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 ScrollbarThemeAura::paintTrackPiece(GraphicsContext* gc, ScrollbarThemeClient* scrollbar, const IntRect& rect, ScrollbarPart partType)
     73 {
     74     if (gc->paintingDisabled())
     75         return;
     76     blink::WebThemeEngine::State state = scrollbar->hoveredPart() == partType ? blink::WebThemeEngine::StateHover : blink::WebThemeEngine::StateNormal;
     77 
     78     if (useMockTheme() && !scrollbar->enabled())
     79         state = blink::WebThemeEngine::StateDisabled;
     80 
     81     IntRect alignRect = trackRect(scrollbar, false);
     82     blink::WebThemeEngine::ExtraParams extraParams;
     83     blink::WebCanvas* canvas = gc->canvas();
     84     extraParams.scrollbarTrack.isBack = (partType == BackTrackPart);
     85     extraParams.scrollbarTrack.trackX = alignRect.x();
     86     extraParams.scrollbarTrack.trackY = alignRect.y();
     87     extraParams.scrollbarTrack.trackWidth = alignRect.width();
     88     extraParams.scrollbarTrack.trackHeight = alignRect.height();
     89     blink::Platform::current()->themeEngine()->paint(canvas, scrollbar->orientation() == HorizontalScrollbar ? blink::WebThemeEngine::PartScrollbarHorizontalTrack : blink::WebThemeEngine::PartScrollbarVerticalTrack, state, blink::WebRect(rect), &extraParams);
     90 }
     91 
     92 void ScrollbarThemeAura::paintButton(GraphicsContext* gc, ScrollbarThemeClient* scrollbar, const IntRect& rect, ScrollbarPart part)
     93 {
     94     if (gc->paintingDisabled())
     95         return;
     96     blink::WebThemeEngine::Part paintPart;
     97     blink::WebThemeEngine::State state = blink::WebThemeEngine::StateNormal;
     98     blink::WebCanvas* canvas = gc->canvas();
     99     bool checkMin = false;
    100     bool checkMax = false;
    101 
    102     if (scrollbar->orientation() == HorizontalScrollbar) {
    103         if (part == BackButtonStartPart) {
    104             paintPart = blink::WebThemeEngine::PartScrollbarLeftArrow;
    105             checkMin = true;
    106         } else if (useMockTheme() && part != ForwardButtonEndPart) {
    107             return;
    108         } else {
    109             paintPart = blink::WebThemeEngine::PartScrollbarRightArrow;
    110             checkMax = true;
    111         }
    112     } else {
    113         if (part == BackButtonStartPart) {
    114             paintPart = blink::WebThemeEngine::PartScrollbarUpArrow;
    115             checkMin = true;
    116         } else if (useMockTheme() && part != ForwardButtonEndPart) {
    117             return;
    118         } else {
    119             paintPart = blink::WebThemeEngine::PartScrollbarDownArrow;
    120             checkMax = true;
    121         }
    122     }
    123     if (useMockTheme() && !scrollbar->enabled()) {
    124         state = blink::WebThemeEngine::StateDisabled;
    125     } else if (!useMockTheme() && ((checkMin && (scrollbar->currentPos() <= 0))
    126         || (checkMax && scrollbar->currentPos() >= scrollbar->maximum()))) {
    127         state = blink::WebThemeEngine::StateDisabled;
    128     } else {
    129         if (part == scrollbar->pressedPart())
    130             state = blink::WebThemeEngine::StatePressed;
    131         else if (part == scrollbar->hoveredPart())
    132             state = blink::WebThemeEngine::StateHover;
    133     }
    134     blink::Platform::current()->themeEngine()->paint(canvas, paintPart, state, blink::WebRect(rect), 0);
    135 }
    136 
    137 void ScrollbarThemeAura::paintThumb(GraphicsContext* gc, ScrollbarThemeClient* scrollbar, const IntRect& rect)
    138 {
    139     if (gc->paintingDisabled())
    140         return;
    141     blink::WebThemeEngine::State state;
    142     blink::WebCanvas* canvas = gc->canvas();
    143     if (scrollbar->pressedPart() == ThumbPart)
    144         state = blink::WebThemeEngine::StatePressed;
    145     else if (scrollbar->hoveredPart() == ThumbPart)
    146         state = blink::WebThemeEngine::StateHover;
    147     else
    148         state = blink::WebThemeEngine::StateNormal;
    149     blink::Platform::current()->themeEngine()->paint(canvas, scrollbar->orientation() == HorizontalScrollbar ? blink::WebThemeEngine::PartScrollbarHorizontalThumb : blink::WebThemeEngine::PartScrollbarVerticalThumb, state, blink::WebRect(rect), 0);
    150 }
    151 
    152 IntSize ScrollbarThemeAura::buttonSize(ScrollbarThemeClient* scrollbar)
    153 {
    154     if (scrollbar->orientation() == VerticalScrollbar) {
    155         IntSize size = blink::Platform::current()->themeEngine()->getSize(blink::WebThemeEngine::PartScrollbarUpArrow);
    156         return IntSize(size.width(), scrollbar->height() < 2 * size.height() ? scrollbar->height() / 2 : size.height());
    157     }
    158 
    159     // HorizontalScrollbar
    160     IntSize size = blink::Platform::current()->themeEngine()->getSize(blink::WebThemeEngine::PartScrollbarLeftArrow);
    161     return IntSize(scrollbar->width() < 2 * size.width() ? scrollbar->width() / 2 : size.width(), size.height());
    162 }
    163 
    164 int ScrollbarThemeAura::minimumThumbLength(ScrollbarThemeClient* scrollbar)
    165 {
    166     if (scrollbar->orientation() == VerticalScrollbar) {
    167         IntSize size = blink::Platform::current()->themeEngine()->getSize(blink::WebThemeEngine::PartScrollbarVerticalThumb);
    168         return size.height();
    169     }
    170 
    171     IntSize size = blink::Platform::current()->themeEngine()->getSize(blink::WebThemeEngine::PartScrollbarHorizontalThumb);
    172     return size.width();
    173 }
    174 
    175 } // namespace WebCore
    176