SWT(JFace)体验之FormLayout布局

测试代码如下：

package swt_jface.demo2;import org.eclipse.swt.SWT;import org.eclipse.swt.layout.FormAttachment;import org.eclipse.swt.layout.FormData;import org.eclipse.swt.layout.FormLayout;import org.eclipse.swt.widgets.Button;import org.eclipse.swt.widgets.Display;import org.eclipse.swt.widgets.Shell;public class FormLayoutSample { Display display = new Display(); Shell shell = new Shell(display); public FormLayoutSample() { shell.setLayout(new FormLayout()); Button button1 = new Button(shell, SWT.PUSH); button1.setText("button1"); FormData formData = new FormData(); formData.left = new FormAttachment(20); formData.top = new FormAttachment(20); button1.setLayoutData(formData); Button button2 = new Button(shell, SWT.PUSH); button2.setText("button number 2"); formData = new FormData(); formData.left = new FormAttachment(button1, 0, SWT.CENTER); formData.top = new FormAttachment(button1, 0, SWT.CENTER); button2.setLayoutData(formData); // Button button3 = new Button(shell, SWT.PUSH);// button3.setText("3");// // formData = new FormData();// formData.top = new FormAttachment(button2, 10);// formData.left = new FormAttachment(button2, 0, SWT.LEFT);// button3.setLayoutData(formData); shell.pack(); //shell.setSize(500, 600); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) { display.sleep(); } } display.dispose(); } public static void main(String[] args) { new FormLayoutSample(); }}

 

再看一个例子：

package swt_jface.demo2;import org.eclipse.swt.SWT;import org.eclipse.swt.graphics.Point;import org.eclipse.swt.graphics.Rectangle;import org.eclipse.swt.layout.FormAttachment;import org.eclipse.swt.layout.FormData;import org.eclipse.swt.layout.FormLayout;import org.eclipse.swt.widgets.Button;import org.eclipse.swt.widgets.Display;import org.eclipse.swt.widgets.Event;import org.eclipse.swt.widgets.Label;import org.eclipse.swt.widgets.List;import org.eclipse.swt.widgets.Listener;import org.eclipse.swt.widgets.Shell;public class Main { public static void main(String[] args) { Display display = new Display(); final Shell shell = new Shell(display); Label label = new Label(shell, SWT.WRAP); label .setText("This is a long text string that will wrap when the dialog is resized."); List list = new List(shell, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL); list.setItems(new String[] { "Item 1", "Item2" }); Button button1 = new Button(shell, SWT.PUSH); button1.setText("Ok"); Button button2 = new Button(shell, SWT.PUSH); button2.setText("Cancel"); final int insetX = 4, insetY = 4; FormLayout formLayout = new FormLayout(); formLayout.marginWidth = insetX; formLayout.marginHeight = insetY; shell.setLayout(formLayout); Point size = label.computeSize(SWT.DEFAULT, SWT.DEFAULT); final FormData labelData = new FormData(size.x, SWT.DEFAULT); labelData.left = new FormAttachment(0, 0); labelData.right = new FormAttachment(100, 0); label.setLayoutData(labelData); shell.addListener(SWT.Resize, new Listener() { public void handleEvent(Event e) { Rectangle rect = shell.getClientArea(); labelData.width = rect.width - insetX * 2; shell.layout(); } }); FormData button2Data = new FormData(); button2Data.right = new FormAttachment(100, -insetX); button2Data.bottom = new FormAttachment(100, 0); button2.setLayoutData(button2Data); FormData button1Data = new FormData(); button1Data.right = new FormAttachment(button2, -insetX); button1Data.bottom = new FormAttachment(100, 0); button1.setLayoutData(button1Data); FormData listData = new FormData(); listData.left = new FormAttachment(0, 0); listData.right = new FormAttachment(100, 0); listData.top = new FormAttachment(label, insetY); listData.bottom = new FormAttachment(button2, -insetY); list.setLayoutData(listData); shell.pack(); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); }}