First Checked In.

cmd/macfe/rdfui/CNavCenterScroller.cp

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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * The contents of this file are subject to the Netscape Public License
+ * Version 1.0 (the "NPL"); you may not use this file except in
+ * compliance with the NPL.  You may obtain a copy of the NPL at
+ * http://www.mozilla.org/NPL/
+ *
+ * Software distributed under the NPL is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
+ * for the specific language governing rights and limitations under the
+ * NPL.
+ *
+ * The Initial Developer of this code under the NPL is Netscape
+ * Communications Corporation.  Portions created by Netscape are
+ * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
+ * Reserved.
+ */
+
+//
+// Mike Pinkerton, Netscape Communications
+//
+// Subclass of LActiveScroller to handle resizing the vertical scrollbar
+// when the column headers appear or disappear.
+//
+
+#include "CNavCenterScroller.h"
+
+
+CNavCenterScroller :: CNavCenterScroller ( LStream* inStream )
+	: LActiveScroller(inStream)
+{
+}
+
+
+//
+// ColumnHeadersChangedVisibility
+//
+// Adjust the vertical scrollbar when the column headers appear or disappear.
+// If they are being hidden (probably the most common case since they appear by default
+// in the PPob), move the top of the scrollbar up and stretch it by the size of the
+// column headers. The only tricky part is that we move and resize by opposingly signed 
+// amounts.
+//
+void
+CNavCenterScroller :: ColumnHeadersChangedVisibility ( bool inNowVisible, Uint16 inHeaderHeight )
+{
+	Int16 delta = inNowVisible ? inHeaderHeight : -inHeaderHeight;
+	
+	mVerticalBar->MoveBy ( 0, delta, false );
+	mVerticalBar->ResizeFrameBy ( 0, -delta, true );
+		// why do we need to refresh the scrollbar? if we mode-switch on the fly while the
+		// window is open (which we probably won't ever do...BUT), the scrollbar is the only
+		// part that doesn't get redrawn by the coordinator. As a result, we need to make sure
+		// it is done here. If the window is not visible, PowerPlant is smart enough not to
+		// redraw it, so we don't get any overhead in the normal case. Wow, 11 lines of comments
+		// for 3 lines of obivous code. You gotta love that! 
+
+} // ColumnHeadesrChangedVisibility

cmd/macfe/rdfui/CNavCenterScroller.h

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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * The contents of this file are subject to the Netscape Public License
+ * Version 1.0 (the "NPL"); you may not use this file except in
+ * compliance with the NPL.  You may obtain a copy of the NPL at
+ * http://www.mozilla.org/NPL/
+ *
+ * Software distributed under the NPL is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
+ * for the specific language governing rights and limitations under the
+ * NPL.
+ *
+ * The Initial Developer of this code under the NPL is Netscape
+ * Communications Corporation.  Portions created by Netscape are
+ * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
+ * Reserved.
+ */
+
+//
+// Mike Pinkerton, Netscape Communications
+//
+// Subclass of LActiveScroller to handle resizing the vertical scrollbar
+// when the column headers appear or disappear.
+//
+
+#pragma once
+
+#include <LActiveScroller.h>
+
+
+class CNavCenterScroller : public LActiveScroller
+{
+public:
+	enum { class_ID = 'NCSc' };
+
+	CNavCenterScroller ( LStream *inStream );
+	
+	virtual void ColumnHeadersChangedVisibility ( bool inNowVisible, Uint16 inHeaderHeight ) ;
+
+}; // class CNavCenterScroller