Add implementation of WebThemeEngine for the Mac (declared by...

webkit/glue/webthemeengine_impl_mac.cc

+// Copyright (c) 2010 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 "webkit/glue/webthemeengine_impl_mac.h"
+
+#include <Carbon/Carbon.h>

[darin (slow to review), 2010/12/23 07:24:24]

nit: we usually put a new line between system headers and others.

+#include "third_party/WebKit/WebKit/chromium/public/WebCanvas.h"
+#include "third_party/WebKit/WebKit/chromium/public/WebRect.h"
+
+using WebKit::WebCanvas;
+using WebKit::WebRect;
+using WebKit::WebThemeEngine;
+
+namespace webkit_glue {
+
+static ThemeTrackEnableState stateToHIEnableState(WebThemeEngine::State state) {
+  switch (state) {
+    case WebThemeEngine::StateDisabled:
+      return kThemeTrackDisabled;
+    case WebThemeEngine::StateInactive:
+      return kThemeTrackInactive;
+    default:
+      return kThemeTrackActive;
+  }
+}
+
+void WebThemeEngineImpl::paintScrollbarThumb(
+    WebCanvas* canvas,
+    WebThemeEngine::State state,
+    WebThemeEngine::Size size,
+    const WebRect& rect,
+    const WebThemeEngine::ScrollbarInfo& scrollbarInfo) {
+  HIThemeTrackDrawInfo trackInfo;
+  trackInfo.version = 0;
+  trackInfo.kind = size == WebThemeEngine::SizeRegular ?
+      kThemeMediumScrollBar : kThemeSmallScrollBar;
+  trackInfo.bounds = CGRectMake(rect.x, rect.y, rect.width, rect.height);
+  trackInfo.min = 0;
+  trackInfo.max = scrollbarInfo.maxValue;
+  trackInfo.value = scrollbarInfo.currentValue;
+  trackInfo.trackInfo.scrollbar.viewsize = scrollbarInfo.visibleSize;
+  trackInfo.attributes = 0;
+  if (scrollbarInfo.orientation ==
+      WebThemeEngine::ScrollbarOrientationHorizontal) {
+    trackInfo.attributes |= kThemeTrackHorizontal;
+  }
+
+  trackInfo.enableState = stateToHIEnableState(state);
+
+  trackInfo.trackInfo.scrollbar.pressState =
+      state == WebThemeEngine::StatePressed ? kThemeThumbPressed : 0;
+  trackInfo.attributes |= (kThemeTrackShowThumb | kThemeTrackHideTrack);
+  HIThemeDrawTrack(&trackInfo, 0, canvas, kHIThemeOrientationNormal);
+}
+}  // namespace webkit_glue

[darin (slow to review), 2010/12/23 07:24:24]

nit: add a new line above here.