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import java.awt.Dimension; |
import java.awt.Dimension; |
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import java.awt.Graphics; |
import java.awt.Graphics; |
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import java.awt.Point; |
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import java.awt.event.MouseWheelEvent; |
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import java.awt.event.MouseWheelListener; |
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import java.beans.PropertyChangeEvent; |
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import java.beans.PropertyChangeListener; |
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import javax.swing.JComponent; |
import javax.swing.JComponent; |
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import javax.swing.JScrollBar; |
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import javax.swing.JScrollPane; |
import javax.swing.JScrollPane; |
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import javax.swing.JViewport; |
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import javax.swing.ScrollPaneConstants; |
import javax.swing.ScrollPaneConstants; |
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import javax.swing.ScrollPaneLayout; |
import javax.swing.ScrollPaneLayout; |
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import javax.swing.UIDefaults; |
import javax.swing.UIDefaults; |
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import javax.swing.UIManager; |
import javax.swing.UIManager; |
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import javax.swing.event.ChangeEvent; |
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import javax.swing.event.ChangeListener; |
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import javax.swing.plaf.ComponentUI; |
import javax.swing.plaf.ComponentUI; |
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import javax.swing.plaf.ScrollPaneUI; |
import javax.swing.plaf.ScrollPaneUI; |
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implements ScrollPaneConstants |
implements ScrollPaneConstants |
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{ |
{ |
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/** |
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* Listens for changes in the state of the horizontal scrollbar's model and |
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* updates the scrollpane accordingly. |
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* |
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* @author Roman Kennke (kennke@aicas.com) |
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*/ |
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public class HSBChangeListener implements ChangeListener |
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{ |
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/** |
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* Receives notification when the state of the horizontal scrollbar |
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* model has changed. |
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* |
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* @param event the change event |
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*/ |
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public void stateChanged(ChangeEvent event) |
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{ |
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JScrollBar hsb = scrollpane.getHorizontalScrollBar(); |
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JViewport vp = scrollpane.getViewport(); |
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Point viewPosition = vp.getViewPosition(); |
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int xpos = hsb.getValue(); |
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if (xpos != viewPosition.x) |
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{ |
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viewPosition.x = xpos; |
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vp.setViewPosition(viewPosition); |
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} |
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viewPosition.y = 0; |
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JViewport columnHeader = scrollpane.getColumnHeader(); |
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if (columnHeader != null |
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&& !columnHeader.getViewPosition().equals(viewPosition)) |
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columnHeader.setViewPosition(viewPosition); |
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} |
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} |
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/** |
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* Listens for changes in the state of the vertical scrollbar's model and |
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* updates the scrollpane accordingly. |
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* |
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* @author Roman Kennke (kennke@aicas.com) |
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*/ |
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public class VSBChangeListener implements ChangeListener |
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{ |
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/** |
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* Receives notification when the state of the vertical scrollbar |
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* model has changed. |
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* |
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* @param event the change event |
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*/ |
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public void stateChanged(ChangeEvent event) |
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{ |
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JScrollBar vsb = scrollpane.getVerticalScrollBar(); |
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JViewport vp = scrollpane.getViewport(); |
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Point viewPosition = vp.getViewPosition(); |
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int ypos = vsb.getValue(); |
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if (ypos != viewPosition.x) |
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{ |
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viewPosition.y = ypos; |
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vp.setViewPosition(viewPosition); |
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} |
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viewPosition.x = 0; |
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JViewport rowHeader = scrollpane.getRowHeader(); |
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if (rowHeader != null |
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&& !rowHeader.getViewPosition().equals(viewPosition)) |
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rowHeader.setViewPosition(viewPosition); |
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} |
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} |
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/** |
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* Listens for changes of the viewport's extent size and updates the |
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* scrollpane accordingly. |
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* |
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* @author Roman Kennke (kennke@aicas.com) |
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*/ |
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public class ViewportChangeHandler implements ChangeListener |
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{ |
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/** |
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* Receives notification when the view's size, position or extent size |
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* changes. When the extents size has changed, this method calls |
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* {@link BasicScrollPaneUI#syncScrollPaneWithViewport()} to adjust the |
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* scrollbars extents as well. |
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* |
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* @param event the change event |
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*/ |
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public void stateChanged(ChangeEvent event) |
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{ |
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JViewport vp = scrollpane.getViewport(); |
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JScrollBar hsb = scrollpane.getHorizontalScrollBar(); |
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JScrollBar vsb = scrollpane.getVerticalScrollBar(); |
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Dimension extents = vp.getExtentSize(); |
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if (extents.width != hsb.getModel().getExtent() |
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|| extents.height != vsb.getModel().getExtent()) |
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syncScrollPaneWithViewport(); |
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} |
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} |
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/** |
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* Listens for property changes on the scrollpane and update the view |
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* accordingly. |
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* |
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* @author Roman Kennke (kennke@aicas.com) |
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*/ |
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public class PropertyChangeHandler implements PropertyChangeListener |
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{ |
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/** |
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* Receives notification when any of the scrollpane's bound property |
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* changes. This method calls the appropriate update method on the |
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* <code>ScrollBarUI</code>. |
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* |
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* @param e the property change event |
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* |
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* @see BasicScrollPaneUI#updateColumnHeader(PropertyChangeEvent) |
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* @see BasicScrollPaneUI#updateRowHeader(PropertyChangeEvent) |
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* @see BasicScrollPaneUI#updateScrollBarDisplayPolicy(PropertyChangeEvent) |
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* @see BasicScrollPaneUI#updateViewport(PropertyChangeEvent) |
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*/ |
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public void propertyChange(PropertyChangeEvent e) |
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{ |
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if (e.getPropertyName().equals("viewport")) |
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updateViewport(e); |
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else if (e.getPropertyName().equals("rowHeader")) |
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updateRowHeader(e); |
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else if (e.getPropertyName().equals("columnHeader")) |
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updateColumnHeader(e); |
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else if (e.getPropertyName().equals("horizontalScrollBarPolicy") |
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|| e.getPropertyName().equals("verticalScrollBarPolicy")) |
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updateScrollBarDisplayPolicy(e); |
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} |
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} |
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/** |
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* Listens for mouse wheel events and update the scrollpane accordingly. |
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* |
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* @author Roman Kennke (kennke@aicas.com) |
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* |
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* @since 1.4 |
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*/ |
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protected class MouseWheelHandler implements MouseWheelListener |
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{ |
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/** |
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* Receives notification whenever the mouse wheel is moved. |
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* |
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* @param event the mouse wheel event |
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*/ |
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public void mouseWheelMoved(MouseWheelEvent event) |
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{ |
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} |
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} |
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/** The Scrollpane for which the UI is provided by this class. */ |
/** The Scrollpane for which the UI is provided by this class. */ |
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protected JScrollPane scrollpane; |
protected JScrollPane scrollpane; |
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/** |
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* The horizontal scrollbar listener. |
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*/ |
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protected ChangeListener hsbChangeListener; |
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/** |
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* The vertical scrollbar listener. |
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*/ |
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protected ChangeListener vsbChangeListener; |
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/** |
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* The viewport listener. |
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*/ |
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protected ChangeListener viewportChangeListener; |
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/** |
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* The scrollpane property change listener. |
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*/ |
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protected PropertyChangeListener spPropertyChangeListener; |
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/** |
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* The mousewheel listener for the scrollpane. |
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*/ |
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MouseWheelListener mouseWheelListener; |
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public static ComponentUI createUI(final JComponent c) |
public static ComponentUI createUI(final JComponent c) |
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{ |
{ |
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return new BasicScrollPaneUI(); |
return new BasicScrollPaneUI(); |
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public void installUI(final JComponent c) |
public void installUI(final JComponent c) |
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{ |
{ |
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super.installUI(c); |
super.installUI(c); |
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this.installDefaults((JScrollPane)c); |
installDefaults((JScrollPane) c); |
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installListeners((JScrollPane) c); |
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} |
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/** |
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* Installs the listeners on the scrollbars, the viewport and the scrollpane. |
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* |
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* @param sp the scrollpane on which to install the listeners |
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*/ |
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protected void installListeners(JScrollPane sp) |
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{ |
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if (spPropertyChangeListener == null) |
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spPropertyChangeListener = createPropertyChangeListener(); |
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sp.addPropertyChangeListener(spPropertyChangeListener); |
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if (hsbChangeListener == null) |
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hsbChangeListener = createHSBChangeListener(); |
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sp.getHorizontalScrollBar().getModel().addChangeListener(hsbChangeListener); |
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if (vsbChangeListener == null) |
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vsbChangeListener = createVSBChangeListener(); |
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sp.getVerticalScrollBar().getModel().addChangeListener(vsbChangeListener); |
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if (viewportChangeListener == null) |
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viewportChangeListener = createViewportChangeListener(); |
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sp.getViewport().addChangeListener(viewportChangeListener); |
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if (mouseWheelListener == null) |
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mouseWheelListener = new MouseWheelHandler(); |
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sp.addMouseWheelListener(mouseWheelListener); |
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} |
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/** |
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* Creates and returns the change listener for the horizontal scrollbar. |
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* |
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* @return the change listener for the horizontal scrollbar |
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*/ |
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protected ChangeListener createHSBChangeListener() |
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{ |
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return new HSBChangeListener(); |
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} |
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/** |
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* Creates and returns the change listener for the vertical scrollbar. |
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* |
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* @return the change listener for the vertical scrollbar |
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*/ |
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protected ChangeListener createVSBChangeListener() |
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{ |
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return new VSBChangeListener(); |
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} |
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/** |
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* Creates and returns the change listener for the viewport. |
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* |
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* @return the change listener for the viewport |
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*/ |
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protected ChangeListener createViewportChangeListener() |
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{ |
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return new ViewportChangeHandler(); |
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} |
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/** |
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* Creates and returns the property change listener for the scrollpane. |
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* |
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* @return the property change listener for the scrollpane |
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*/ |
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protected PropertyChangeListener createPropertyChangeListener() |
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{ |
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return new PropertyChangeHandler(); |
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} |
} |
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public void uninstallUI(final JComponent c) |
public void uninstallUI(final JComponent c) |
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{ |
{ |
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super.uninstallUI(c); |
super.uninstallUI(c); |
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this.uninstallDefaults((JScrollPane)c); |
this.uninstallDefaults((JScrollPane)c); |
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uninstallListeners((JScrollPane) c); |
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} |
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/** |
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* Uninstalls all the listeners that have been installed in |
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* {@link #installListeners(JScrollPane)}. |
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* |
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* @param c the scrollpane from which to uninstall the listeners |
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*/ |
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protected void uninstallListeners(JComponent c) |
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{ |
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JScrollPane sp = (JScrollPane) c; |
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sp.removePropertyChangeListener(spPropertyChangeListener); |
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sp.getHorizontalScrollBar().getModel() |
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.removeChangeListener(hsbChangeListener); |
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sp.getVerticalScrollBar().getModel() |
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.removeChangeListener(vsbChangeListener); |
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sp.getViewport().removeChangeListener(viewportChangeListener); |
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sp.removeMouseWheelListener(mouseWheelListener); |
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} |
} |
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public Dimension getMinimumSize(JComponent c) |
public Dimension getMinimumSize(JComponent c) |
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{ |
{ |
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JScrollPane p = (JScrollPane ) c; |
JScrollPane p = (JScrollPane ) c; |
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// do nothing; the normal painting-of-children algorithm, along with |
// do nothing; the normal painting-of-children algorithm, along with |
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// ScrollPaneLayout, does all the relevant work. |
// ScrollPaneLayout, does all the relevant work. |
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} |
} |
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/** |
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* Synchronizes the scrollbars with the viewport's extents. |
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*/ |
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protected void syncScrollPaneWithViewport() |
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{ |
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JViewport vp = scrollpane.getViewport(); |
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JScrollBar vsb = scrollpane.getVerticalScrollBar(); |
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JScrollBar hsb = scrollpane.getHorizontalScrollBar(); |
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hsb.getModel().setExtent(vp.getExtentSize().width); |
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vsb.getModel().setExtent(vp.getExtentSize().height); |
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} |
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/** |
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* Receives notification when the <code>columnHeader</code> property has |
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* changed on the scrollpane. |
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* |
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* @param ev the property change event |
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*/ |
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protected void updateColumnHeader(PropertyChangeEvent ev) |
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{ |
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// TODO: Find out what should be done here. Or is this only a hook? |
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} |
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/** |
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* Receives notification when the <code>rowHeader</code> property has changed |
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* on the scrollpane. |
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* |
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* @param ev the property change event |
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*/ |
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protected void updateRowHeader(PropertyChangeEvent ev) |
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{ |
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// TODO: Find out what should be done here. Or is this only a hook? |
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} |
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/** |
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* Receives notification when the <code>scrollBarDisplayPolicy</code> |
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* property has changed on the scrollpane. |
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* |
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* @param ev the property change event |
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*/ |
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protected void updateScrollBarDisplayPolicy(PropertyChangeEvent ev) |
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{ |
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// TODO: Find out what should be done here. Or is this only a hook? |
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} |
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/** |
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* Receives notification when the <code>viewport</code> property has changed |
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* on the scrollpane. |
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* |
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* This method sets removes the viewportChangeListener from the old viewport |
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* and adds it to the new viewport. |
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* |
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* @param ev the property change event |
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*/ |
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protected void updateViewport(PropertyChangeEvent ev) |
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{ |
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JViewport oldViewport = (JViewport) ev.getOldValue(); |
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oldViewport.removeChangeListener(viewportChangeListener); |
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JViewport newViewport = (JViewport) ev.getNewValue(); |
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oldViewport.addChangeListener(viewportChangeListener); |
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} |
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} |
} |
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