SWT(JFace)体验之Slider，Scale

Slider：

package swt_jface.demo8; import org.eclipse.swt.SWT; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Slider; import org.eclipse.swt.widgets.Text; public class SampleSlider { Display display = new Display(); Shell shell = new Shell(display); Slider slider; Text value; public SampleSlider() { shell.setLayout(new GridLayout(1, true)); Label label = new Label(shell, SWT.NULL); label.setText("Volume:"); slider = new Slider(shell, SWT.VERTICAL); slider.setBounds(0, 0, 40, 200); slider.setMaximum(24); slider.setMinimum(0); slider.setIncrement(1); slider.setPageIncrement(5); slider.setThumb(4); slider.addListener(SWT.Selection, new Listener() { public void handleEvent(Event event) { int perspectiveValue = slider.getMaximum() - slider.getSelection() + slider.getMinimum() - slider.getThumb(); value.setText("Vol: " + perspectiveValue); } }); value = new Text(shell, SWT.BORDER | SWT.SINGLE); value.setEditable(false); slider.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_CENTER)); value.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_CENTER)); shell.pack(); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) { display.sleep(); } } display.dispose(); } public static void main(String[] args) { new SampleSlider(); } }

 

Scale：

package swt_jface.demo8; import org.eclipse.swt.SWT; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Scale; import org.eclipse.swt.widgets.Shell; public class Scales { Display display = new Display(); Shell shell = new Shell(display); public Scales() { Scale scaleH = new Scale(shell, SWT.NULL); Scale scaleV = new Scale(shell, SWT.VERTICAL); scaleH.setBounds(0, 0, 100, 50); scaleV.setBounds(0, 50, 50, 100); System.out.println("Min: " + scaleH.getMinimum()); System.out.println("Max: " + scaleH.getMaximum()); shell.pack(); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) { display.sleep(); } } display.dispose(); } public static void main(String[] args) { new Scales(); } }

 

再看一个演示：

package swt_jface.demo8; import org.eclipse.swt.SWT; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Scale; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; public class ScaleExample { Display display = new Display(); Shell shell = new Shell(display); Scale scale; Text value; public ScaleExample() { shell.setLayout(new GridLayout(1, true)); Label label = new Label(shell, SWT.NULL); label.setText("Volume:"); scale = new Scale(shell, SWT.VERTICAL); scale.setBounds(0, 0, 40, 200); scale.setMaximum(20); scale.setMinimum(0); scale.setIncrement(1); scale.setPageIncrement(5); scale.addListener(SWT.Selection, new Listener() { public void handleEvent(Event event) { int perspectiveValue = scale.getMaximum() - scale.getSelection() + scale.getMinimum(); value.setText("Vol: " + perspectiveValue); } }); value = new Text(shell, SWT.BORDER | SWT.SINGLE); value.setEditable(false); scale.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_CENTER)); value.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_CENTER)); shell.pack(); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) { display.sleep(); } } display.dispose(); } public static void main(String[] args) { new ScaleExample(); } }