Rendre un JSCrollPane immédiat

Gus Lun 30 Nov - 13:46

Voici une entité qui permet de rendre un JScrollPane immédiat (un simple clic ramène l'ascenseur à l'endroit voulu).

gus.graphic.scrollpane.immediatscroll

Code:: package gus05.entity.gus.graphic.scrollpane.immediatscroll; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.awt.event.MouseMotionListener; import gus05.framework.core.Entity; import gus05.framework.features.Give; import gus05.framework.features.Register; import javax.swing.BoundedRangeModel; import javax.swing.JButton; import javax.swing.JScrollBar; import javax.swing.JScrollPane; import javax.swing.plaf.metal.MetalScrollBarUI; public class ImmediatScroll implements Entity, Give, Register, MouseListener, MouseMotionListener { public String getName() {return "gus.graphic.scrollpane.immediatscroll";} public String getCreationDate() {return "2008.08.11";} private boolean vertical = true; private boolean horizontal = true; public void register(String key, Object obj) throws Exception { if(key.equals("vertical")) {vertical = Boolean.parseBoolean(obj.toString());return;} if(key.equals("horizontal")) {horizontal = Boolean.parseBoolean(obj.toString());return;} throw new Exception("Unknown key: "+key); } public void give(Object obj) throws Exception { JScrollPane scroll = (JScrollPane)obj; if(vertical) { JScrollBar bar = scroll.getVerticalScrollBar(); handleBar(bar); } if(horizontal) { JScrollBar bar = scroll.getHorizontalScrollBar(); handleBar(bar); } } private void handleBar(JScrollBar bar) { bar.setUI(new ScrollBarUI0()); bar.addMouseListener(this); bar.addMouseMotionListener(this); bar.setBlockIncrement(0); } public void mouseClicked(MouseEvent e) {} public void mouseEntered(MouseEvent e) {} public void mouseExited(MouseEvent e) {} public void mouseReleased(MouseEvent e) {} public void mousePressed(MouseEvent e) {move(e);} public void mouseDragged(MouseEvent e) {move(e);} public void mouseMoved(MouseEvent e) {} private void move(MouseEvent e) { JScrollBar bar = (JScrollBar)e.getSource(); BoundedRangeModel model = bar.getModel(); ScrollBarUI0 ui = (ScrollBarUI0) bar.getUI(); int decr_h = ui.getDecrButton().getHeight(); int incr_h = ui.getIncrButton().getHeight(); int h0 = bar.getHeight() - decr_h - incr_h; double v = (e.getPoint().getY() - incr_h)/(double)h0; int min = model.getMinimum(); int max = model.getMaximum(); int newValue = (int)(min + (max-min)*v); bar.getModel().setValue(newValue); } private class ScrollBarUI0 extends MetalScrollBarUI { public JButton getDecrButton() {return decrButton;} public JButton getIncrButton() {return incrButton;} } }