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

   1 /*
   2  * Copyright (c) 2008, 2009, Google 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 are
   6  * met:
   7  *
   8  *     * Redistributions of source code must retain the above copyright
   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
  13  * distribution.
  14  *     * Neither the name of Google Inc. nor the names of its
  15  * contributors may be used to endorse or promote products derived from
  16  * this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT{
  24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,{
  25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  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/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 #if defined(OS_TIZEN)
  55         DEFINE_STATIC_LOCAL(ScrollbarThemeOverlay, theme, (3, 4, ScrollbarThemeOverlay::DisallowHitTest));
  56 #else
  57         DEFINE_STATIC_LOCAL(ScrollbarThemeOverlay, theme, (10, 0, ScrollbarThemeOverlay::AllowHitTest, Color(128, 128, 128, 192)));
  58 #endif
  59         return &theme;
  60     }
  61
  62     DEFINE_STATIC_LOCAL(ScrollbarThemeGtkOrAura, theme, ());
  63     return &theme;
  64 }
  65
  66 int ScrollbarThemeGtkOrAura::scrollbarThickness(ScrollbarControlSize controlSize)
  67 {
  68     // Horiz and Vert scrollbars are the same thickness.
  69     // In unit tests we don't have the mock theme engine (because of layering violations), so we hard code the size (see bug 327470).
  70     if (useMockTheme())
  71         return 15;
  72     IntSize scrollbarSize = blink::Platform::current()->themeEngine()->getSize(blink::WebThemeEngine::PartScrollbarVerticalTrack);
  73     return scrollbarSize.width();
  74 }
  75
  76 void ScrollbarThemeGtkOrAura::paintTrackPiece(GraphicsContext* gc, ScrollbarThemeClient* scrollbar, const IntRect& rect, ScrollbarPart partType)
  77 {
  78     blink::WebThemeEngine::State state = scrollbar->hoveredPart() == partType ? blink::WebThemeEngine::StateHover : blink::WebThemeEngine::StateNormal;
  79
  80     if (useMockTheme() && !scrollbar->enabled())
  81         state = blink::WebThemeEngine::StateDisabled;
  82
  83     IntRect alignRect = trackRect(scrollbar, false);
  84     blink::WebThemeEngine::ExtraParams extraParams;
  85     blink::WebCanvas* canvas = gc->canvas();
  86     extraParams.scrollbarTrack.isBack = (partType == BackTrackPart);
  87     extraParams.scrollbarTrack.trackX = alignRect.x();
  88     extraParams.scrollbarTrack.trackY = alignRect.y();
  89     extraParams.scrollbarTrack.trackWidth = alignRect.width();
  90     extraParams.scrollbarTrack.trackHeight = alignRect.height();
  91     blink::Platform::current()->themeEngine()->paint(canvas, scrollbar->orientation() == HorizontalScrollbar ? blink::WebThemeEngine::PartScrollbarHorizontalTrack : blink::WebThemeEngine::PartScrollbarVerticalTrack, state, blink::WebRect(rect), &extraParams);
  92 }
  93
  94 void ScrollbarThemeGtkOrAura::paintButton(GraphicsContext* gc, ScrollbarThemeClient* scrollbar, const IntRect& rect, ScrollbarPart part)
  95 {
  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 ScrollbarThemeGtkOrAura::paintThumb(GraphicsContext* gc, ScrollbarThemeClient* scrollbar, const IntRect& rect)
 138 {
 139     blink::WebThemeEngine::State state;
 140     blink::WebCanvas* canvas = gc->canvas();
 141     if (scrollbar->pressedPart() == ThumbPart)
 142         state = blink::WebThemeEngine::StatePressed;
 143     else if (scrollbar->hoveredPart() == ThumbPart)
 144         state = blink::WebThemeEngine::StateHover;
 145     else
 146         state = blink::WebThemeEngine::StateNormal;
 147     blink::Platform::current()->themeEngine()->paint(canvas, scrollbar->orientation() == HorizontalScrollbar ? blink::WebThemeEngine::PartScrollbarHorizontalThumb : blink::WebThemeEngine::PartScrollbarVerticalThumb, state, blink::WebRect(rect), 0);
 148 }
 149
 150 bool ScrollbarThemeGtkOrAura::shouldCenterOnThumb(ScrollbarThemeClient*, const PlatformMouseEvent& evt)
 151 {
 152     return (evt.shiftKey() && evt.button() == LeftButton) || (evt.button() == MiddleButton);
 153 }
 154
 155 IntSize ScrollbarThemeGtkOrAura::buttonSize(ScrollbarThemeClient* scrollbar)
 156 {
 157     if (scrollbar->orientation() == VerticalScrollbar) {
 158         IntSize size = blink::Platform::current()->themeEngine()->getSize(blink::WebThemeEngine::PartScrollbarUpArrow);
 159         return IntSize(size.width(), scrollbar->height() < 2 * size.height() ? scrollbar->height() / 2 : size.height());
 160     }
 161
 162     // HorizontalScrollbar
 163     IntSize size = blink::Platform::current()->themeEngine()->getSize(blink::WebThemeEngine::PartScrollbarLeftArrow);
 164     return IntSize(scrollbar->width() < 2 * size.width() ? scrollbar->width() / 2 : size.width(), size.height());
 165 }
 166
 167 int ScrollbarThemeGtkOrAura::minimumThumbLength(ScrollbarThemeClient* scrollbar)
 168 {
 169     if (scrollbar->orientation() == VerticalScrollbar) {
 170         IntSize size = blink::Platform::current()->themeEngine()->getSize(blink::WebThemeEngine::PartScrollbarVerticalThumb);
 171         return size.height();
 172     }
 173
 174     IntSize size = blink::Platform::current()->themeEngine()->getSize(blink::WebThemeEngine::PartScrollbarHorizontalThumb);
 175     return size.width();
 176 }
 177
 178 } // namespace WebCore