1 files changed, 111 insertions, 0 deletions
diff --git a/chromium/third_party/WebKit/Source/core/platform/chromium/ScrollbarThemeChromiumOverlay.cpp b/chromium/third_party/WebKit/Source/core/platform/chromium/ScrollbarThemeChromiumOverlay.cpp
new file mode 100644
index 00000000000..c10c89bbd55
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+++ b/chromium/third_party/WebKit/Source/core/platform/chromium/ScrollbarThemeChromiumOverlay.cpp
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2011 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "core/platform/chromium/ScrollbarThemeChromiumOverlay.h"
+
+#include "core/platform/PlatformMouseEvent.h"
+#include "core/platform/Scrollbar.h"
+#include "core/platform/graphics/GraphicsContext.h"
+#include "core/platform/graphics/transforms/TransformationMatrix.h"
+
+#include <algorithm>
+
+using namespace std;
+
+namespace WebCore {
+
+static const int scrollbarWidth = 3;
+static const int scrollbarMargin = 4;
+
+int ScrollbarThemeChromiumOverlay::scrollbarThickness(ScrollbarControlSize controlSize)
+{
+    return scrollbarWidth + scrollbarMargin;
+}
+
+bool ScrollbarThemeChromiumOverlay::usesOverlayScrollbars() const
+{
+    return true;
+}
+
+int ScrollbarThemeChromiumOverlay::thumbPosition(ScrollbarThemeClient* scrollbar)
+{
+    if (!scrollbar->totalSize())
+        return 0;
+
+    int trackLen = trackLength(scrollbar);
+    float proportion = static_cast<float>(scrollbar->currentPos()) / scrollbar->totalSize();
+    return round(proportion * trackLen);
+}
+
+int ScrollbarThemeChromiumOverlay::thumbLength(ScrollbarThemeClient* scrollbar)
+{
+    int trackLen = trackLength(scrollbar);
+
+    if (!scrollbar->totalSize())
+        return trackLen;
+
+    float proportion = (float)scrollbar->visibleSize() / scrollbar->totalSize();
+    int length = round(proportion * trackLen);
+    length = min(max(length, minimumThumbLength(scrollbar)), trackLen);
+    return length;
+}
+
+bool ScrollbarThemeChromiumOverlay::hasThumb(ScrollbarThemeClient* scrollbar)
+{
+    return true;
+}
+
+IntRect ScrollbarThemeChromiumOverlay::backButtonRect(ScrollbarThemeClient*, ScrollbarPart, bool)
+{
+    return IntRect();
+}
+
+IntRect ScrollbarThemeChromiumOverlay::forwardButtonRect(ScrollbarThemeClient*, ScrollbarPart, bool)
+{
+    return IntRect();
+}
+
+IntRect ScrollbarThemeChromiumOverlay::trackRect(ScrollbarThemeClient* scrollbar, bool)
+{
+    IntRect rect = scrollbar->frameRect();
+    if (scrollbar->orientation() == HorizontalScrollbar)
+        rect.inflateX(-scrollbarMargin);
+    else
+        rect.inflateY(-scrollbarMargin);
+    return rect;
+}
+
+void ScrollbarThemeChromiumOverlay::paintThumb(GraphicsContext* context, ScrollbarThemeClient* scrollbar, const IntRect& rect)
+{
+    IntRect thumbRect = rect;
+    if (scrollbar->orientation() == HorizontalScrollbar)
+        thumbRect.setHeight(thumbRect.height() - scrollbarMargin);
+    else
+        thumbRect.setWidth(thumbRect.width() - scrollbarMargin);
+    context->fillRect(thumbRect, Color(128, 128, 128, 128));
+}
+
+} // namespace WebCore