Update libcc / bindings snapshot to WebKit r126830

cc/CCScrollbarGeometryFixedThumb.cpp

+// Copyright 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+
+#include "CCScrollbarGeometryFixedThumb.h"
+
+#include <cmath>
+#include <public/WebRect.h>
+#include <public/WebScrollbar.h>
+
+using WebKit::WebRect;
+using WebKit::WebScrollbar;
+using WebKit::WebScrollbarThemeGeometry;
+
+namespace WebCore {
+
+PassOwnPtr<CCScrollbarGeometryFixedThumb> CCScrollbarGeometryFixedThumb::create(PassOwnPtr<WebScrollbarThemeGeometry> geometry)
+{
+    return adoptPtr(new CCScrollbarGeometryFixedThumb(geometry));
+}
+
+CCScrollbarGeometryFixedThumb::~CCScrollbarGeometryFixedThumb()
+{
+}
+
+void CCScrollbarGeometryFixedThumb::update(WebScrollbar* scrollbar)
+{
+    int length = CCScrollbarGeometryStub::thumbLength(scrollbar);
+
+    if (scrollbar->orientation() == WebScrollbar::Horizontal)
+        m_thumbSize = IntSize(length, scrollbar->size().height);
+    else
+        m_thumbSize = IntSize(scrollbar->size().width, length);
+}
+
+WebScrollbarThemeGeometry* CCScrollbarGeometryFixedThumb::clone() const
+{
+    CCScrollbarGeometryFixedThumb* geometry = new CCScrollbarGeometryFixedThumb(adoptPtr(CCScrollbarGeometryStub::clone()));
+    geometry->m_thumbSize = m_thumbSize;
+    return geometry;
+}
+
+int CCScrollbarGeometryFixedThumb::thumbLength(WebScrollbar* scrollbar)
+{
+    if (scrollbar->orientation() == WebScrollbar::Horizontal)
+        return m_thumbSize.width();
+    return m_thumbSize.height();
+}
+
+int CCScrollbarGeometryFixedThumb::thumbPosition(WebScrollbar* scrollbar)
+{
+    if (scrollbar->enabled()) {
+        float size = scrollbar->maximum();
+        if (!size)
+            return 1;
+        int value = std::min(std::max(0, scrollbar->value()), scrollbar->maximum());
+        float pos = (trackLength(scrollbar) - thumbLength(scrollbar)) * value / size;
+        return static_cast<int>(floorf((pos < 1 && pos > 0) ? 1 : pos));
+    }
+    return 0;
+}
+void CCScrollbarGeometryFixedThumb::splitTrack(WebScrollbar* scrollbar, const WebRect& unconstrainedTrackRect, WebRect& beforeThumbRect, WebRect& thumbRect, WebRect& afterThumbRect)
+{
+    // This is a reimplementation of ScrollbarThemeComposite::splitTrack.
+    // Because the WebScrollbarThemeGeometry functions call down to native
+    // ScrollbarThemeComposite code which uses ScrollbarThemeComposite virtual
+    // helpers, there's no way to override a helper like thumbLength from
+    // the WebScrollbarThemeGeometry level. So, these three functions
+    // (splitTrack, thumbPosition, thumbLength) are copied here so that the
+    // WebScrollbarThemeGeometry helper functions are used instead and
+    // a fixed size thumbLength can be used.
+
+    WebRect trackRect = constrainTrackRectToTrackPieces(scrollbar, unconstrainedTrackRect);
+    int thickness = scrollbar->orientation() == WebScrollbar::Horizontal ? scrollbar->size().height : scrollbar->size().width;
+    int thumbPos = thumbPosition(scrollbar);
+    if (scrollbar->orientation() == WebScrollbar::Horizontal) {
+        thumbRect = WebRect(trackRect.x + thumbPos, trackRect.y + (trackRect.height - thickness) / 2, thumbLength(scrollbar), thickness);
+        beforeThumbRect = WebRect(trackRect.x, trackRect.y, thumbPos + thumbRect.width / 2, trackRect.height);
+        afterThumbRect = WebRect(trackRect.x + beforeThumbRect.width, trackRect.y, trackRect.x + trackRect.width - beforeThumbRect.x - beforeThumbRect.width, trackRect.height);
+    } else {
+        thumbRect = WebRect(trackRect.x + (trackRect.width - thickness) / 2, trackRect.y + thumbPos, thickness, thumbLength(scrollbar));
+        beforeThumbRect = WebRect(trackRect.x, trackRect.y, trackRect.width, thumbPos + thumbRect.height / 2);
+        afterThumbRect = WebRect(trackRect.x, trackRect.y + beforeThumbRect.height, trackRect.width, trackRect.y + trackRect.height - beforeThumbRect.y - beforeThumbRect.height);
+    }
+}
+
+CCScrollbarGeometryFixedThumb::CCScrollbarGeometryFixedThumb(PassOwnPtr<WebScrollbarThemeGeometry> geometry)
+    : CCScrollbarGeometryStub(geometry)
+{
+}
+
+}