按钮有普通按钮(SWT.PUSH)、单选按钮(SWT.RADIO)、多选按钮(SWT.CHECK)、箭头按钮(SWT.ARROW)和切换按钮(SWT.TOGGLE)几种类型。
同时,也可以设置按钮的样式。设置按钮文字对齐的样式有SWT.LEFT、SWT.RIGHT和SWT.CENTER。设置按钮的外观风格的样式有SWT.FLAT和SWT.BORDER。
1. 普通按钮(SWT.PUSH)
package www.swt.com;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class testButton {
/**
* @param args
*/
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setSize(600, 100);
shell.setLayout(new RowLayout(SWT.HORIZONTAL));
shell.setText("Button");
Button bt1 = new Button(shell, SWT.PUSH | SWT.LEFT);
bt1.setText("SWT.LEFT");
bt1.setToolTipText("SWT.LEFT"); //悬浮提示
Button bt2 = new Button(shell, SWT.PUSH | SWT.RIGHT);
bt2.setText("SWT.RIGHT");
bt2.setToolTipText("SWT.RIGHT");
Button bt3 = new Button(shell, SWT.PUSH | SWT.CENTER);
bt3.setText("SWT.CENTER");
bt3.setToolTipText("SWT.CENTER");
Button bt4 = new Button(shell, SWT.PUSH | SWT.FLAT);
bt4.setText("SWT.FLAT");
bt4.setToolTipText("SWT.FLAT");
Button bt5 = new Button(shell, SWT.PUSH | SWT.BORDER);
bt5.setText("SWT.BORDER");
bt5.setToolTipText("SWT.BORDER");
// bt1.pack();
// bt2.pack();
// bt3.pack();
// bt4.pack();
// bt5.pack();
shell.open();
shell.pack();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}
显示效果:
2. 切换按钮(SWT.TOGGLE)
切换按钮单击后保持按下状态,再次单击时恢复初始状态。
Button bt1 = new Button(shell, SWT.TOGGLE | SWT.LEFT);
bt1.setText("SWT.LEFT");
bt1.setToolTipText("SWT.LEFT"); //悬浮提示
Button bt2 = new Button(shell, SWT.TOGGLE | SWT.FLAT);
bt2.setText("SWT.FLAT");
bt2.setToolTipText("SWT.FLAT");
Button bt3 = new Button(shell, SWT.PUSH | SWT.BORDER);
bt3.setText("SWT.BORDER");
bt3.setToolTipText("SWT.BORDER");
显示效果:
3. 箭头按钮(SWT.ARROW)
箭头按钮是带有小箭头的按钮,创建时需要指定箭头的方向SWT.UP、SWT.DOWN、SWT.LEFT和SWT.RIGHT,若不指定方向,默认为SWT.UP。
Button bt1 = new Button(shell, SWT.ARROW | SWT.UP);
Button bt2 = new Button(shell, SWT.ARROW | SWT.DOWN);
Button bt3 = new Button(shell, SWT.ARROW | SWT.LEFT);
Button bt4 = new Button(shell, SWT.ARROW | SWT.RIGHT);
Button bt5 = new Button(shell, SWT.ARROW | SWT.FLAT);
Button bt6 = new Button(shell, SWT.ARROW | SWT.BORDER);
显示效果:
Group group1 = new Group(shell, SWT.SHADOW_ETCHED_OUT);
group1.setLayout(new FillLayout(SWT.VERTICAL));
group1.setText("这是一组样式");
Button bt1 = new Button(group1, SWT.RADIO | SWT.LEFT);
bt1.setText("SWT.LEFT");
Button bt2 = new Button(group1, SWT.RADIO | SWT.RIGHT);
bt2.setText("SWT.RIGHT");
Button bt3 = new Button(group1, SWT.RADIO | SWT.CENTER);
bt3.setText("SWT.CENTER");
//////////////
Group group2 = new Group(shell, SWT.SHADOW_ETCHED_OUT);
group2.setLayout(new FillLayout(SWT.VERTICAL));
group2.setText("这是另一组样式");
Button bt4 = new Button(group2, SWT.RADIO | SWT.FLAT);
bt4.setText("SWT.FLAT");
bt4.setSelection(true);
Button bt5 = new Button(group2, SWT.RADIO | SWT.BORDER);
bt5.setText("SWT.BORDER");
Button bt6 = new Button(group2, SWT.RADIO);
bt6.setText("SWT.RADIO");
对于单选按钮,创建对象时要指定按钮所属的父类。
显示效果:
group2.setVisible(false); 显示效果:
5. 多选按钮(SWT.CHECK)
Group group = new Group(shell, SWT.SHADOW_ETCHED_OUT);
group.setLayout(new FillLayout(SWT.VERTICAL));
group.setText("不同样式的多选按钮");
Button bt1 = new Button(group, SWT.CHECK | SWT.LEFT);
bt1.setText("SWT.LEFT");
Button bt2 = new Button(group, SWT.CHECK | SWT.RIGHT);
bt2.setText("SWT.RIGHT");
Button bt3 = new Button(group, SWT.CHECK | SWT.CENTER);
bt3.setText("SWT.CENTER");
Button bt4 = new Button(group, SWT.CHECK | SWT.FLAT);
bt4.setText("SWT.FLAT");
Button bt5 = new Button(group, SWT.CHECK | SWT.BORDER);
bt5.setText("SWT.BORDER");
显示效果:
增加事件:
RowLayout layout = new RowLayout(SWT.VERTICAL);
layout.marginWidth = 10;
shell.setLayout(layout);
Group group = new Group(shell, SWT.SHADOW_ETCHED_OUT);
group.setLayout(new FillLayout(SWT.VERTICAL));
group.setText("您的爱好是:");
final Button[] button = new Button[5];
String[] items = {"看书", "游泳", "音乐", "睡觉", "逛街"};
for (int i = 0; i < button.length; i++) {
button[i] =new Button(group, SWT.CHECK);
button[i].setText(items[i]);
}
Button ok = new Button(group, SWT.PUSH);
ok.setText("确定");
ok.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
for (int i = 0; i < button.length; i++) {
if (button[i].getSelection()) {
System.out.println("您选择了:"+button[i].getText());
}
}
}
});
显示效果:
6. 常用的方法
设置和获取按钮文本:setText、getText
设置和获取按钮是否被选中:setSelection、getSelection
设置和获取按钮图标:setImage、getImage
button.setImage(display.getSystemImage(SWT.ICON_ERROR))
button.setImage(new Image(display, "F:\\edit.gif"))
设置和获取按钮文字对齐方式:setAlignment、getAlignment
添加代码:
ok.setImage(display.getSystemImage(SWT.ICON_INFORMATION));
显示效果: