我正在尝试使用我创建的名为subpanel
. [如果您想知道命名,我还有另一个名为 的类masterpanel
,其中包含一个按钮,该按钮启动一个包含subpanel
.
的目的subpanel
是当用户点击enter
按钮时,颜色会发生变化。目前,我每个都subpanel
包含一个名为 的内部类EnterAction
,它调用setBackground
来更改颜色。
我想知道如何修改它,以便我可以同步所有subpanels
.
目前,我有一个变量green
,我相信我可以在所有面板之间传递它。但是,我不确定如何EnterAction
更改所有当前活动的面板?
我正在考虑创建一个活动列表subpanels
?但这会导致一个额外的问题,如果用户关闭,我需要维护列表subpanel
吗?
这是我的代码:
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.KeyStroke;
public class SubPanel extends javax.swing.JPanel
{
private Action enterAction;
public SubPanel()
{
initComponents();
enterAction = new EnterAction();
//KeyBindings on the enter button
this.getInputMap().put(KeyStroke.getKeyStroke( "ENTER" ), "doEnterAction");
this.getActionMap().put( "doEnterAction", enterAction );
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
setForeground(new java.awt.Color(1, 1, 1));
setToolTipText("");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
this.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 400, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 300, Short.MAX_VALUE)
);
}// </editor-fold>
// Variables declaration - do not modify
// End of variables declaration
private static int green = 240;
private class EnterAction extends AbstractAction
{
@Override
public void actionPerformed(ActionEvent ae)
{
//System.out.println("Enter button is pressed");
green -= 5;
if (green <= 0) green = 0;
setBackground(new java.awt.Color(255, green, 255));
}
}
}
编辑:最多有 5 个面板。这消除了创建列表维护活动面板的需要。