StackOverflow2013

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2012-04-12T04:07:21.203
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2012-04-12T04:07:21.203
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<p>This seems to do the trick:</p> <pre><code>class DocumentScroller extends JScrollPane implements ChangeListener { Component view ; JPanel bookPanel, bookTop ; ScrollingDocumentListener listener ; Dimension pageSize ; public DocumentScroller ( Component view ) { this.view = view ; } public DocumentScroller ( Component view, int vsbPolicy, int hsbPolicy ) { super( vsbPolicy, hsbPolicy ) ; this.view = view ; } public void setViewportView ( Component view ) { this.view = view ; } public void setPageCount ( int pagect ) { if ( view == null ) return ; pageSize = view.getPreferredSize() ; Dimension bookSize = new Dimension( pageSize ) ; bookSize.height *= pagect ; bookPanel = new JPanel() ; bookPanel.setLayout( new BorderLayout() ) ; bookPanel.setPreferredSize( bookSize ) ; bookPanel.add( bookTop = new JPanel(), BorderLayout.NORTH ) ; bookPanel.add( view, BorderLayout.CENTER ) ; super.setViewportView( bookPanel ) ; getViewport().addChangeListener( this ) ; } public void setUnitIncrement ( int unitIncrement ) { getVerticalScrollBar().setUnitIncrement( unitIncrement ) ; } public void setValue ( int value ) { getVerticalScrollBar().setValue( value ) ; } public void setScrollingDocumentListener ( ScrollingDocumentListener listener ) { this.listener = listener ; } public void stateChanged ( ChangeEvent e ) { try { if ( e.getSource().getClass() != Class.forName( "javax.swing.JViewport" ) ) return ; } catch ( Exception ex ) { return ; } Rectangle rect = ( (JViewport) e.getSource() ).getViewRect() ; int offset = rect.y %pageSize.height ; int pageTop = rect.y -offset ; int pos = offset *rect.height /pageSize.height ; bookTop.setPreferredSize( new Dimension( 0, pageTop +pos ) ) ; bookPanel.doLayout() ; if ( listener != null ) listener.setPage( pageTop /pageSize.height ) ; } } interface ScrollingDocumentListener { void setPage ( int pageno ) ; } </code></pre>
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1. POOverriding JScrollPane Behavior
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1. USSunny Jim
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1. COThe problem with this codes is an annoying bounce effect. First, the display refreshes on scrollbar action. Then on stateChanged() the "view" component moves up slightly and the display is refreshed. The solution is to somehow intercept the first refresh.
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