Part 10 of cc/ directory shuffles: layers

cc/scrollbar_geometry_fixed_thumb.cc

-// 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 "cc/scrollbar_geometry_fixed_thumb.h"
-
-#include <cmath>
-
-#include "third_party/WebKit/Source/Platform/chromium/public/WebRect.h"
-#include "third_party/WebKit/Source/Platform/chromium/public/WebScrollbar.h"
-
-using WebKit::WebRect;
-using WebKit::WebScrollbar;
-using WebKit::WebScrollbarThemeGeometry;
-
-namespace cc {
-
-scoped_ptr<ScrollbarGeometryFixedThumb> ScrollbarGeometryFixedThumb::create(scoped_ptr<WebScrollbarThemeGeometry> geometry)
-{
-    return make_scoped_ptr(new ScrollbarGeometryFixedThumb(geometry.Pass()));
-}
-
-ScrollbarGeometryFixedThumb::~ScrollbarGeometryFixedThumb()
-{
-}
-
-WebScrollbarThemeGeometry* ScrollbarGeometryFixedThumb::clone() const
-{
-    ScrollbarGeometryFixedThumb* geometry = new ScrollbarGeometryFixedThumb(make_scoped_ptr(ScrollbarGeometryStub::clone()));
-    geometry->m_thumbSize = m_thumbSize;
-    return geometry;
-}
-
-int ScrollbarGeometryFixedThumb::thumbLength(WebScrollbar* scrollbar)
-{
-    if (scrollbar->orientation() == WebScrollbar::Horizontal)
-        return m_thumbSize.width();
-    return m_thumbSize.height();
-}
-
-int ScrollbarGeometryFixedThumb::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 ScrollbarGeometryFixedThumb::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);
-    }
-}
-
-ScrollbarGeometryFixedThumb::ScrollbarGeometryFixedThumb(scoped_ptr<WebScrollbarThemeGeometry> geometry)
-    : ScrollbarGeometryStub(geometry.Pass())
-{
-}
-
-}  // namespace cc