Java 将键绑定添加到从动作命令获取动作的JButton?
我在另一个问题中找到了一个很酷的方法来创建一个JButton,它的操作可以以一种简单的方式编写和查看:Java 将键绑定添加到从动作命令获取动作的JButton?,java,swing,action,keymapping,Java,Swing,Action,Keymapping,我在另一个问题中找到了一个很酷的方法来创建一个JButton,它的操作可以以一种简单的方式编写和查看: public JButton makeToolbarButton(String title, String actionCommand) { JButton button = new JButton(title); button.setActionCommand(actionCommand); button.addActionListener(this); re
public JButton makeToolbarButton(String title, String actionCommand) {
JButton button = new JButton(title);
button.setActionCommand(actionCommand);
button.addActionListener(this);
return button;
}
此方法所在的类实现ActionListener,按钮命令由以下人员分配:
public void actionPerformed(ActionEvent e) {
int action = Integer.parseInt(e.getActionCommand());
switch(action) {
case 1:
System.out.println("This button pressed.");
break;
}
}
按钮由以下部件制成:
JButton button1 = makeToolbarButton("Button 1", "1");
所以我的问题是:我能用这个方法给按钮添加击键吗?我尝试了类似的方法(在makeToolbarButton
方法中):
但我认为这不起作用,因为action命令实际上并没有将操作分配给特定的按钮。有没有办法向
makeToolbarButton()
方法添加一些内容和一个按键参数来完成此操作?我认为您没有抓住操作的要点。操作
旨在提供一个独立的工作单元。这意味着实际上不需要actionCommand
,因为当触发actionListener
事件时,您确切地知道执行它的上下文
我还避免使用KeyStroke.getKeyStroke(String)
,因为文本是对您想要做什么的详细描述(即按下B
或其他什么,但不必说,正确操作很痛苦)
因此,下面演示如何使用Action
s并将它们分配给按钮和键绑定
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class ActionTest {
public static void main(String[] args) {
new ActionTest();
}
public ActionTest() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
add(createButton(new ActionOne(), KeyStroke.getKeyStroke(KeyEvent.VK_1, 0)));
add(createButton(new ActionTwo(), KeyStroke.getKeyStroke(KeyEvent.VK_2, 0)));
}
public JButton createButton(Action action, KeyStroke keyStroke) {
JButton btn = new JButton(action);
btn.getInputMap(WHEN_IN_FOCUSED_WINDOW).put(keyStroke, "button_pressed");
btn.getActionMap().put("button_pressed", action);
return btn;
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
g2d.dispose();
}
}
public class ActionOne extends AbstractAction {
public ActionOne() {
putValue(NAME, "1");
putValue(Action.ACTION_COMMAND_KEY, "Action.one");
}
@Override
public void actionPerformed(ActionEvent e) {
System.out.println(e.getActionCommand());
}
}
public class ActionTwo extends AbstractAction {
public ActionTwo() {
putValue(NAME, "2");
putValue(Action.ACTION_COMMAND_KEY, "Action.two");
}
@Override
public void actionPerformed(ActionEvent e) {
System.out.println(e.getActionCommand());
}
}
}
有关更多详细信息,请参见我认为您没有抓住操作
API的要点。操作
旨在提供一个独立的工作单元。这意味着实际上不需要actionCommand
,因为当触发actionListener
事件时,您确切地知道执行它的上下文
我还避免使用KeyStroke.getKeyStroke(String)
,因为文本是对您想要做什么的详细描述(即按下B
或其他什么,但不必说,正确操作很痛苦)
因此,下面演示如何使用Action
s并将它们分配给按钮和键绑定
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class ActionTest {
public static void main(String[] args) {
new ActionTest();
}
public ActionTest() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
add(createButton(new ActionOne(), KeyStroke.getKeyStroke(KeyEvent.VK_1, 0)));
add(createButton(new ActionTwo(), KeyStroke.getKeyStroke(KeyEvent.VK_2, 0)));
}
public JButton createButton(Action action, KeyStroke keyStroke) {
JButton btn = new JButton(action);
btn.getInputMap(WHEN_IN_FOCUSED_WINDOW).put(keyStroke, "button_pressed");
btn.getActionMap().put("button_pressed", action);
return btn;
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
g2d.dispose();
}
}
public class ActionOne extends AbstractAction {
public ActionOne() {
putValue(NAME, "1");
putValue(Action.ACTION_COMMAND_KEY, "Action.one");
}
@Override
public void actionPerformed(ActionEvent e) {
System.out.println(e.getActionCommand());
}
}
public class ActionTwo extends AbstractAction {
public ActionTwo() {
putValue(NAME, "2");
putValue(Action.ACTION_COMMAND_KEY, "Action.two");
}
@Override
public void actionPerformed(ActionEvent e) {
System.out.println(e.getActionCommand());
}
}
}
有关更多详细信息,请参阅。按钮。getAction()
将不起作用,因为您尚未将操作
分配给按钮。按钮。getAction()
将不起作用,因为您尚未将操作
分配给按钮。我想我必须单独添加操作。我只是想知道是否有一种快捷简单的方法来使用字符串进行击键。我会将您的解决方案添加到我的程序中。谢谢我想我必须单独添加操作。我只是想知道是否有一种快捷简单的方法来使用字符串进行击键。我会将您的解决方案添加到我的程序中。谢谢