Add ScrollBar.cpp to fix the build.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@15723 268f45cc-cd09-0410-ab3c-d52691b4dbfc

diff --git a/WebCore/platform/ScrollBar.cpp b/WebCore/platform/ScrollBar.cpp
new file mode 100644 (file)
index 0000000..f0ff1e6
--- /dev/null
+++ b/WebCore/platform/ScrollBar.cpp
@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2004, 2006 Apple Computer, 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 COMPUTER, INC. ``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 COMPUTER, INC. OR
+ * 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.
+ */
+
+#import "config.h"
+#import "ScrollBar.h"
+
+namespace WebCore {
+
+ScrollBar::ScrollBar(ScrollBarClient* client, ScrollBarOrientation orientation)
+    : m_client(client)
+    , m_orientation(orientation)
+    , m_visibleSize(0)
+    , m_totalSize(0)
+    , m_currentPos(0)
+    , m_lineStep(0)
+    , m_pageStep(0)
+{
+}
+
+bool ScrollBar::setValue(int v)
+{
+    int maxPos = m_totalSize - m_visibleSize;
+    if (v < 0) v = 0;
+    if (v > maxPos)
+        v = maxPos;
+    if (m_currentPos == v)
+        return false; // Our value stayed the same.
+    m_currentPos = v;
+
+    setScrollBarValue(v);
+
+    if (client())
+        client()->valueChanged(this);
+    
+    return true;
+}
+
+void ScrollBar::setSteps(int lineStep, int pageStep)
+{
+    m_lineStep = lineStep;
+    m_pageStep = pageStep;
+}
+
+bool ScrollBar::scroll(ScrollDirection direction, ScrollGranularity granularity, float multiplier)
+{
+    float delta = 0.0;
+    if ((direction == ScrollUp && m_orientation == VerticalScrollBar) || (direction == ScrollLeft && m_orientation == HorizontalScrollBar)) {
+        if (granularity == ScrollByLine) {
+            delta = -m_lineStep;
+        } else if (granularity == ScrollByPage) {
+            delta = -m_pageStep;
+        } else if (granularity == ScrollByDocument) {
+            delta = -m_currentPos;
+        } else if (granularity == ScrollByWheel) {
+            delta = -m_lineStep;
+        }
+    } else if ((direction == ScrollDown && m_orientation == VerticalScrollBar) || (direction == ScrollRight && m_orientation == HorizontalScrollBar)) {
+        if (granularity == ScrollByLine) {
+            delta = m_lineStep;
+        } else if (granularity == ScrollByPage) {
+            delta = m_pageStep;
+        } else if (granularity == ScrollByDocument) {
+            delta = m_totalSize - m_visibleSize - m_currentPos;
+        } else if (granularity == ScrollByWheel) {
+            delta = m_lineStep;
+        }
+    }
+    int newPos = (int)(m_currentPos + (delta * multiplier));
+    return setValue(newPos);
+}
+
+}