学步园

代码如下：

package swt_jface.demo;<br /> import org.eclipse.swt.SWT;<br /> import org.eclipse.swt.events.SelectionAdapter;<br /> import org.eclipse.swt.events.SelectionEvent;<br /> import org.eclipse.swt.graphics.Image;<br /> import org.eclipse.swt.layout.GridData;<br /> import org.eclipse.swt.layout.GridLayout;<br /> import org.eclipse.swt.widgets.Button;<br /> import org.eclipse.swt.widgets.Display;<br /> import org.eclipse.swt.widgets.FileDialog;<br /> import org.eclipse.swt.widgets.Label;<br /> import org.eclipse.swt.widgets.Shell;<br /> import org.eclipse.swt.widgets.Text;<br /> public class IconSelector {<br /> Display display = new Display();<br /> Shell shell = new Shell(display);<br /> Label labelIconFile;<br /> Text textIconFile;</p> <p> Button buttonIconBrowse;<br /> Button buttonSetIcon;</p> <p> Image shellIcon;</p> <p> Image buttonIcon;</p> <p> public IconSelector() {</p> <p> initializeUI();</p> <p> shell.pack();<br /> shell.open();</p> <p> while (!shell.isDisposed()) {<br /> if (!display.readAndDispatch()) {<br /> display.sleep();<br /> }<br /> }<br /> display.dispose();<br /> }</p> <p> private void initializeUI() {<br /> GridLayout gridLayout = new GridLayout(3, false);<br /> shell.setLayout(gridLayout);<br /> labelIconFile = new Label(shell, SWT.NULL);</p> <p> textIconFile = new Text(shell, SWT.SINGLE | SWT.BORDER);</p> <p> GridData gridData = new GridData(GridData.FILL_HORIZONTAL);<br /> gridData.grabExcessHorizontalSpace = true;<br /> textIconFile.setLayoutData(gridData);<br /> buttonIconBrowse = new Button(shell, SWT.PUSH);<br /> gridData = new GridData();<br /> gridData.horizontalSpan = 3;<br /> gridData.horizontalAlignment = GridData.CENTER;<br /> buttonSetIcon = new Button(shell, SWT.PUSH);<br /> buttonSetIcon.setLayoutData(gridData);<br /> shell.setText("Icon Selector");<br /> labelIconFile.setText("Select an icon:");<br /> buttonIconBrowse.setText("Browse");<br /> buttonSetIcon.setText("Set Icon");<br /> buttonIconBrowse.addSelectionListener(new SelectionAdapter() {<br /> public void widgetSelected(SelectionEvent e) {<br /> FileDialog dialog = new FileDialog(shell, SWT.OPEN);<br /> String file = dialog.open();<br /> if (file != null) {<br /> textIconFile.setText(file);<br /> }<br /> }<br /> });<br /> buttonSetIcon.addSelectionListener(new SelectionAdapter() {<br /> public void widgetSelected(SelectionEvent e) {<br /> if(shellIcon != null)<br /> shellIcon.dispose();</p> <p> try {<br /> shellIcon = new Image(display, textIconFile.getText());<br /> shell.setImage(shellIcon);<br /> }catch(Exception ex) {<br /> ex.printStackTrace();<br /> }<br /> }<br /> });<br /> }</p> <p> public static void main(String[] args) {<br /> new IconSelector();<br /> }<br /> }