在容器中选择多个JInternalFrame(JPanel) [英] Selection of among multiple JInternalFrames in a container(JPanel)
问题描述
我在 Jpanel
中有一些 JInternalFrame
。并且 JPanel
是gridlayout。我只需要在容器中设置一个 JInternalFrame
( JPanel
)。我动态创建了 JInternalFrame
实例并添加到面板中。我仍然有 JInternalFrame
的列表,但是如何只设置一个选择。
I have some set of JInternalFrame
in a Jpanel
. and the JPanel
is gridlayout. I need to set only one JInternalFrame
to be selected in the container (JPanel
). I created the JInternalFrame
instance dynamically and add to the panel. I still have the list of JInternalFrame
but how to make only one to set selected.
推荐答案
如 如何使用内部框架所示 ,通常,您将内部框架添加到桌面窗格。这允许你使用 activateFrame()
表示框架具有焦点。在此示例中, javax.swing.Action
用于通过 setSelected()
。可以在此 Q& A 中找到其他讨论。
As suggested in How to Use Internal Frames, "Usually, you add internal frames to a desktop pane." This allows you to use activateFrame()
to indicate that a frame has focus. In this example, a javax.swing.Action
is used to select frames from a menu via setSelected()
. Additional discussion may be found in this Q&A.
附录:如果你想使用 JPanel
,或许可以获得一个不错的 GridLayout
,一个方法是使用 InternalFrameListener
,如下所示。
Addendum: If you want to use a JPanel
, perhaps to get a nice GridLayout
, one aproach is to use an InternalFrameListener
as shown below.
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.beans.PropertyVetoException;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.event.InternalFrameAdapter;
import javax.swing.event.InternalFrameEvent;
/** @see https://stackoverflow.com/questions/8389640 */
public class InternalGrid extends JPanel {
private final List<MyFrame> list = new ArrayList<MyFrame>();
public InternalGrid() {
super(new GridLayout(2, 2));
for (int i = 0; i < 4; i++) {
MyFrame f = new MyFrame("Frame", i);
list.add(f);
this.add(f);
}
}
private void display() {
JFrame f = new JFrame("InternalGrid");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(this);
f.pack();
f.setSize(320, 240);
f.setLocationRelativeTo(null);
f.setVisible(true);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new InternalGrid().display();
}
});
}
class MyFrame extends JInternalFrame {
MyFrame(String name, int i) {
super(name + String.valueOf(i), true, true, true, false);
this.pack();
this.setVisible(true);
this.setLayout(new FlowLayout());
this.add(new JLabel("Hi, I'm " + this.getTitle()));
this.addInternalFrameListener(new InternalFrameAdapter() {
@Override
public void internalFrameActivated(InternalFrameEvent e) {
for (MyFrame f : list) {
if (f != MyFrame.this) {
try {
f.setSelected(false);
} catch (PropertyVetoException ex) {
System.out.println(ex);
}
}
}
}
});
}
}
}
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