javaswtbutton_JAVA.SWT/JFace:SWT基本组件之按钮(Button)

《Eclipse SWT/JFACE 核心应用》 清华大学出版社 5.2 按钮(Button)

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&＃xff0c;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 {

/**

* &＃64;param args

*/

public static void main(String[] args) {

Display display &＃61; new Display();

Shell shell &＃61; new Shell(display);

shell.setSize(600, 100);

shell.setLayout(new RowLayout(SWT.HORIZONTAL));

shell.setText("Button");

Button bt1 &＃61; new Button(shell, SWT.PUSH | SWT.LEFT);

bt1.setText("SWT.LEFT");

bt1.setToolTipText("SWT.LEFT"); //悬浮提示

Button bt2 &＃61; new Button(shell, SWT.PUSH | SWT.RIGHT);

bt2.setText("SWT.RIGHT");

bt2.setToolTipText("SWT.RIGHT");

Button bt3 &＃61; new Button(shell, SWT.PUSH | SWT.CENTER);

bt3.setText("SWT.CENTER");

bt3.setToolTipText("SWT.CENTER");

Button bt4 &＃61; new Button(shell, SWT.PUSH | SWT.FLAT);

bt4.setText("SWT.FLAT");

bt4.setToolTipText("SWT.FLAT");

Button bt5 &＃61; 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&＃xff1a;

2. 切换按钮(SWT.TOGGLE)

切换按钮单击后保持按下状态&＃xff0c;再次单击时恢复初始状态。

Button bt1 &＃61; new Button(shell, SWT.TOGGLE | SWT.LEFT);

bt1.setText("SWT.LEFT");

bt1.setToolTipText("SWT.LEFT"); //悬浮提示

Button bt2 &＃61; new Button(shell, SWT.TOGGLE | SWT.FLAT);

bt2.setText("SWT.FLAT");

bt2.setToolTipText("SWT.FLAT");

Button bt3 &＃61; new Button(shell, SWT.PUSH | SWT.BORDER);

bt3.setText("SWT.BORDER");

bt3.setToolTipText("SWT.BORDER");

显示效果&＃xff1a;

3. 箭头按钮(SWT.ARROW)

箭头按钮是带有小箭头的按钮&＃xff0c;创建时需要指定箭头的方向SWT.UP、SWT.DOWN、SWT.LEFT和SWT.RIGHT&＃xff0c;若不指定方向&＃xff0c;默认为SWT.UP。

Button bt1 &＃61; new Button(shell, SWT.ARROW | SWT.UP);

Button bt2 &＃61; new Button(shell, SWT.ARROW | SWT.DOWN);

Button bt3 &＃61; new Button(shell, SWT.ARROW | SWT.LEFT);

Button bt4 &＃61; new Button(shell, SWT.ARROW | SWT.RIGHT);

Button bt5 &＃61; new Button(shell, SWT.ARROW | SWT.FLAT);

Button bt6 &＃61; new Button(shell, SWT.ARROW | SWT.BORDER);

显示效果&＃xff1a;

4. 单选按钮(SWT.RADIO)

Group group1 &＃61; new Group(shell, SWT.SHADOW_ETCHED_OUT);

group1.setLayout(new FillLayout(SWT.VERTICAL));

group1.setText("这是一组样式");

Button bt1 &＃61; new Button(group1, SWT.RADIO | SWT.LEFT);

bt1.setText("SWT.LEFT");

Button bt2 &＃61; new Button(group1, SWT.RADIO | SWT.RIGHT);

bt2.setText("SWT.RIGHT");

Button bt3 &＃61; new Button(group1, SWT.RADIO | SWT.CENTER);

bt3.setText("SWT.CENTER");

//

Group group2 &＃61; new Group(shell, SWT.SHADOW_ETCHED_OUT);

group2.setLayout(new FillLayout(SWT.VERTICAL));

group2.setText("这是另一组样式");

Button bt4 &＃61; new Button(group2, SWT.RADIO | SWT.FLAT);

bt4.setText("SWT.FLAT");

bt4.setSelection(true);

Button bt5 &＃61; new Button(group2, SWT.RADIO | SWT.BORDER);

bt5.setText("SWT.BORDER");

Button bt6 &＃61; new Button(group2, SWT.RADIO);

bt6.setText("SWT.RADIO");

对于单选按钮&＃xff0c;创建对象时要指定按钮所属的父类。

显示效果&＃xff1a;

group2.setVisible(false); 显示效果&＃xff1a;

5. 多选按钮(SWT.CHECK)

Group group &＃61; 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 &＃61; new Button(group, SWT.CHECK | SWT.LEFT);

bt1.setText("SWT.LEFT");

Button bt2 &＃61; new Button(group, SWT.CHECK | SWT.RIGHT);

bt2.setText("SWT.RIGHT");

Button bt3 &＃61; new Button(group, SWT.CHECK | SWT.CENTER);

bt3.setText("SWT.CENTER");

Button bt4 &＃61; new Button(group, SWT.CHECK | SWT.FLAT);

bt4.setText("SWT.FLAT");

Button bt5 &＃61; new Button(group, SWT.CHECK | SWT.BORDER);

bt5.setText("SWT.BORDER");

显示效果&＃xff1a;

增加事件&＃xff1a;

RowLayout layout &＃61; new RowLayout(SWT.VERTICAL);

layout.marginWidth &＃61; 10;

shell.setLayout(layout);

Group group &＃61; new Group(shell, SWT.SHADOW_ETCHED_OUT);

group.setLayout(new FillLayout(SWT.VERTICAL));

group.setText("您的爱好是&＃xff1a;");

final Button[] button &＃61; new Button[5];

String[] items &＃61; {"看书", "游泳", "音乐", "睡觉", "逛街"};

for (int i &＃61; 0; i

button[i] &＃61;new Button(group, SWT.CHECK);

button[i].setText(items[i]);

}

Button ok &＃61; new Button(group, SWT.PUSH);

ok.setText("确定");

ok.addSelectionListener(new SelectionAdapter() {

public void widgetSelected(SelectionEvent e) {

for (int i &＃61; 0; i

if (button[i].getSelection()) {

System.out.println("您选择了&＃xff1a;"&＃43;button[i].getText());

}

}

}

});

显示效果&＃xff1a;

6. 常用的方法

设置和获取按钮文本&＃xff1a;setText、getText

设置和获取按钮是否被选中&＃xff1a;setSelection、getSelection

设置和获取按钮图标&＃xff1a;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&＃xff1a;setAlignment、getAlignment

添加代码&＃xff1a;

ok.setImage(display.getSystemImage(SWT.ICON_INFORMATION));

显示效果&＃xff1a;