SWT(JFace)体验之Label增亮显示

首先来看一下Listener的写法：

ListenerTest.java

 

package swt_jface.demo; import org.eclipse.swt.SWT; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Shell; public class ListenerTest { public ListenerTest() { Display display = new Display(); Shell shell = new Shell(display); shell.setText("Left click your mouse"); shell.setSize(200, 100); shell.open(); shell.addListener(SWT.MouseDown, new SimpleListener("Shell mouse down listener")); display.addFilter(SWT.MouseDown, new SimpleListener("Display mouse down Listener")); display.addFilter(SWT.MouseUp, new SimpleListener("Display mouse up Listener")); while(! shell.isDisposed()) { if(! display.readAndDispatch()) {// If no more entries in event queue display.sleep(); } } display.dispose(); } class SimpleListener implements Listener{ String name; public SimpleListener(String name) { this.name = name; } public void handleEvent(Event e) { System.out.println("Event: [" + EventUtil.getEventName(e.type) + "] from " + name + ". /tCurrent Time (in ms): " + System.currentTimeMillis()); } } public static void main(String[] args) { new ListenerTest(); } }

 

 

EventUtil.java

package swt_jface.demo; import org.eclipse.swt.SWT; public class EventUtil { public static String getEventName(int eventType) { switch(eventType) { case SWT.None: return "null"; case SWT.KeyDown: return "key down"; case SWT.KeyUp: return "key up"; case SWT.MouseDown: return "mouse down"; case SWT.MouseUp: return "mouse up"; case SWT.MouseMove: return "mouse move"; case SWT.MouseEnter: return "mouse enter"; case SWT.MouseExit: return "mouse exit"; case SWT.MouseDoubleClick: return "mouse double click"; case SWT.Paint: return "paint"; case SWT.Move: return "move"; case SWT.Resize: return "resize"; case SWT.Dispose: return "dispose"; case SWT.Selection: return "selection"; case SWT.DefaultSelection: return "default selection"; case SWT.FocusIn: return "focus in"; case SWT.FocusOut: return "focus out"; case SWT.Expand: return "expand"; case SWT.Collapse: return "collapse"; case SWT.Iconify: return "iconify"; case SWT.Deiconify: return "deiconify"; case SWT.Close: return "close"; case SWT.Show: return "show"; case SWT.Hide: return "hide"; case SWT.Modify: return "modify"; case SWT.Verify: return "verify"; case SWT.Activate: return "activate"; case SWT.Deactivate: return "deactivate"; case SWT.Help: return "help"; case SWT.DragDetect: return "drag detect"; case SWT.Arm: return "arm"; case SWT.Traverse: return "traverse"; case SWT.MouseHover: return "mouse hover"; case SWT.HardKeyDown: return "hard key down"; case SWT.HardKeyUp: return "hard key up"; case SWT.MenuDetect: return "menu detect"; } return "unkown ???"; } }

 

测试代码：

如下所示三种写法：

1.LabelHighlighting.java：

package swt_jface.demo; import org.eclipse.swt.SWT; 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; public class LabelHighlighting { Display display = new Display(); Shell shell = new Shell(display); Label label = new Label(shell, SWT.SHADOW_IN | SWT.CENTER); Listener listener = new MouseEnterExitListener(); public LabelHighlighting() { label.setText("Point your cursor here ..."); label.setBounds(30, 30, 200, 30); label.addListener(SWT.MouseEnter, listener); label.addListener(SWT.MouseExit, listener); shell.setText("Move your cursor to test ..."); shell.setSize(260, 120); shell.open(); while(! shell.isDisposed()) { if(! display.readAndDispatch()) { display.sleep(); } } display.dispose(); } class MouseEnterExitListener implements Listener { public void handleEvent(Event e) { switch (e.type) { case SWT.MouseEnter : display.syncExec(new Runnable() { public void run() { label.setBackground(display.getSystemColor(SWT.COLOR_YELLOW)); label.setText("Cursor enters the label"); } }); break; case SWT.MouseExit : display.syncExec(new Runnable() { public void run() { label.setBackground(display.getSystemColor(SWT.COLOR_WIDGET_BACKGROUND)); label.setText("Cursor leaves the label"); } }); break; } } } public static void main(String[] args) { new LabelHighlighting(); } }

 

2.LabelHighlighting2.java：

package swt_jface.demo; import org.eclipse.swt.SWT; import org.eclipse.swt.events.MouseEvent; import org.eclipse.swt.events.MouseTrackListener; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Shell; public class LabelHighlighting2 { Display display = new Display(); Shell shell = new Shell(display); Label label = new Label(shell, SWT.SHADOW_IN | SWT.CENTER); MouseTrackListener listener = new MouseEnterExitListener(); public LabelHighlighting2() { label.setText("Point your cursor here ..."); label.setBounds(30, 30, 200, 30); label.addMouseTrackListener(listener); shell.setText("Move your cursor to test ..."); shell.setSize(260, 120); shell.open(); while(! shell.isDisposed()) { if(! display.readAndDispatch()) { display.sleep(); } } display.dispose(); } class MouseEnterExitListener implements MouseTrackListener { public void mouseEnter(MouseEvent e) { display.syncExec(new Runnable() { public void run() { label.setBackground(display.getSystemColor(SWT.COLOR_YELLOW)); label.setText("Cursor enters the label"); } }); } public void mouseExit(MouseEvent arg0) { display.syncExec(new Runnable() { public void run() { label.setBackground(display.getSystemColor(SWT.COLOR_WIDGET_BACKGROUND)); label.setText("Cursor leaves the label"); } }); } public void mouseHover(MouseEvent arg0) { } } public static void main(String[] args) { new LabelHighlighting2(); } }

 

3.LabelHighlighting3.java

package swt_jface.demo; import org.eclipse.swt.SWT; import org.eclipse.swt.events.MouseEvent; import org.eclipse.swt.events.MouseTrackAdapter; import org.eclipse.swt.events.MouseTrackListener; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Shell; public class LabelHighlighting3 { Display display = new Display(); Shell shell = new Shell(display); Label label = new Label(shell, SWT.SHADOW_IN | SWT.CENTER); MouseTrackListener listener = new MouseEnterExitListener(); public LabelHighlighting3() { label.setText("Point your cursor here ..."); label.setBounds(30, 30, 200, 30); label.addMouseTrackListener(listener); shell.setText("Move your cursor to test ..."); shell.setSize(260, 120); shell.open(); while(! shell.isDisposed()) { if(! display.readAndDispatch()) { display.sleep(); } } display.dispose(); } class MouseEnterExitListener extends MouseTrackAdapter { public void mouseEnter(MouseEvent e) { display.syncExec(new Runnable() { public void run() { label.setBackground(display.getSystemColor(SWT.COLOR_YELLOW)); label.setText("Cursor enters the label"); } }); } public void mouseExit(MouseEvent arg0) { display.syncExec(new Runnable() { public void run() { label.setBackground(display.getSystemColor(SWT.COLOR_WIDGET_BACKGROUND)); label.setText("Cursor leaves the label"); } }); } } public static void main(String[] args) { new LabelHighlighting3(); } }