в 17:44, 31 мая 2010

2010-05-31T17:44:27Z

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2010-05-31T15:31:55Z

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== Always display scrollbar ==



<source lang="java">
import java.awt.BorderLayout;
import java.awt.Container;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.ScrollPaneConstants;
import javax.swing.WindowConstants;
public class Main extends JFrame {
JTextArea textArea;
public Main() {
super();
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
Container contentPane = this.getContentPane();
textArea = new JTextArea();
JScrollPane pane = new JScrollPane(textArea, ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS,
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
contentPane.add(pane, BorderLayout.CENTER);
}
public static void main(String[] args) {
JFrame f = new Main();
f.setSize(300, 200);
f.setVisible(true);
}
}</source>



== Customizing a JScrollBar Look and Feel ==

Property StringObject TypescrollbarColorScrollBar.actionMapActionMapScrollBar.allowsAbsolutePositioningBooleanScrollBar.ancestorInputMapInputMapScrollBar.ancestorInputMap.RightToLeftInputMapScrollBar.backgroundColorScrollBar.borderBorderScrollBar.darkShadowColorScrollBar.focusInputMapObject[ ]ScrollBar.focusInputMap.RightToLeftInputMapScrollBar.foregroundColorScrollBar.gradientListScrollBar.highlightColorScrollBar.maximumThumbSizeDimensionScrollBar.minimumThumbSizeDimensionScrollBar.shadowColorScrollBar.squareButtonsBooleanScrollBar.thumbColorScrollBar.thumbDarkShadowColorScrollBar.thumbHeightIntegerScrollBar.thumbHighlightColorScrollBar.thumbShadowColorScrollBar.trackColorScrollBar.trackForegroundColorScrollBar.trackHighlightColorScrollBar.trackHighlightForegroundColorScrollBar.widthIntegerScrollBarUIString

== JScrollBar and Adjustment event ==



<source lang="java">
import java.awt.Adjustable;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.AdjustmentEvent;
import java.awt.event.AdjustmentListener;
import javax.swing.JFrame;
import javax.swing.JScrollBar;
public class Main {
JScrollBar scrollBarVertical = new JScrollBar();
JScrollBar scrollbarHorizontal = new JScrollBar(Adjustable.HORIZONTAL);
Main() {
JFrame f = new JFrame();
f.setLayout(new FlowLayout());
f.setSize(280, 300);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
scrollBarVertical.setPreferredSize(new Dimension(20, 200));
scrollbarHorizontal.setPreferredSize(new Dimension(200, 20));
scrollbarHorizontal.setValue(50);
scrollBarVertical.addAdjustmentListener(new AdjustmentListener() {
public void adjustmentValueChanged(AdjustmentEvent ae) {
if (scrollBarVertical.getValueIsAdjusting())
return;
System.out.println("Value of vertical scroll bar: " + ae.getValue());
}
});
scrollbarHorizontal.addAdjustmentListener(new AdjustmentListener() {
public void adjustmentValueChanged(AdjustmentEvent ae) {
System.out.println("Value of horizontal scroll bar: " + ae.getValue());
}
});
f.add(scrollBarVertical);
f.add(scrollbarHorizontal);
f.setVisible(true);
}
public static void main(String args[]) {
new Main();
}
}</source>



== Listening to Scrolling Events with a ChangeListener ==



<source lang="java">
import java.awt.BorderLayout;
import javax.swing.BoundedRangeModel;
import javax.swing.JFrame;
import javax.swing.JScrollBar;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
class BoundedChangeListener implements ChangeListener {
public void stateChanged(ChangeEvent changeEvent) {
Object source = changeEvent.getSource();
if (source instanceof BoundedRangeModel) {
BoundedRangeModel aModel = (BoundedRangeModel) source;
if (!aModel.getValueIsAdjusting()) {
System.out.println("Changed: " + aModel.getValue());
}
} else {
System.out.println("Something changed: " + source);
}
}
}
public class ScrollBarSample {
public static void main(String args[]) {
ChangeListener changeListener = new BoundedChangeListener();
JScrollBar aJScrollBar = new JScrollBar(JScrollBar.HORIZONTAL);
BoundedRangeModel model = aJScrollBar.getModel();
model.addChangeListener(changeListener);
JFrame frame = new JFrame("ScrollBars R Us");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(aJScrollBar, BorderLayout.NORTH);
frame.setSize(300, 200);
frame.setVisible(true);
}
}</source>



== The simplest of the bounded range components is the JScrollBar ==

<p>Handling Scrolling Events</p>



<source lang="java">
import java.awt.BorderLayout;
import java.awt.event.AdjustmentEvent;
import java.awt.event.AdjustmentListener;
import javax.swing.JFrame;
import javax.swing.JScrollBar;

public class ScrollBarSample {
public static void main(String args[]) {
AdjustmentListener adjustmentListener = new AdjustmentListener() {
public void adjustmentValueChanged(AdjustmentEvent adjustmentEvent) {
System.out.println("Adjusted: " + adjustmentEvent.getValue());
}
};
JScrollBar oneJScrollBar = new JScrollBar(JScrollBar.HORIZONTAL);
oneJScrollBar.addAdjustmentListener(adjustmentListener);
JFrame frame = new JFrame("ScrollBars R Us");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(oneJScrollBar, BorderLayout.NORTH);
frame.setSize(300, 200);
frame.setVisible(true);
}
}</source>

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в 17:44, 31 мая 2010

Admin: 1 версия