我的var hasHeader = false;
var hasFooter = false;
// users choice of layout
var customPosition = [];
$(this).siblings('.layoutOptions').children('input:checked').each(function(i)
{
customPosition[i] = $(this).val();
if ( customPosition[i]=='content-header'){
hasHeader = true;
}else if (customPosition[i]=='content-footer'){
hasFooter = true;
}
});
$(this).siblings('.contentOptions').children('input:checked').val();
for (i = 0; i< customPosition.length; i++){
console.log(i);
console.log(customPosition[i]);
var canvField = (canvasBHeight - shadowBVal*2) - strokeBWidth*2;
if (customPosition[i] == 'content-header'){
//header positioning
var group = new fabric.Group([],{
left: strokeBWidth + 10,
stroke: '#ddd',
strokeLineJoin: 'round',
strokeWidth: 2,
hasControls: true,
lockMovementX: false,
lockMovementY: false,
lockRotation: true,
selectable: true,
position: posB,
fill: '#ccc',
width: ((canvasBWidth - shadowBVal*2) - strokeBWidth*2 - 10),
//height: canvasBHeight/5 - strokeBWidth,
height: canvField/5,
top: strokeBWidth,
ry: 0,
rx: 20,
//originX: 'center',
//originY: 'center'
});
//add dummy content
fabric.Image.fromURL('image/bordenconfigurator/dummies/header.png', function(oImg) {
oImg.set({
});
group.add(oImg);
console.log('group '+i+' '+customPosition[i]+':');
console.log(JSON.stringify(group));
//console.log(group);
});
}else if(customPosition[i] == 'content-footer') {
console.log(customPosition[i]);
//footer positioning
var group = new fabric.Group([],{
left: strokeBWidth + 10,
stroke: '#ddd',
strokeLineJoin: 'round',
strokeWidth: 2,
hasControls: true,
lockMovementX: false,
lockMovementY: false,
lockRotation: true,
selectable: true,
position: posB,
fill: '#ccc',
width: ((canvasBWidth - shadowBVal*2) - strokeBWidth*2 - 10),
//height: canvasBHeight/5 - strokeBWidth,
height: canvField/5,
top: strokeBWidth + canvField*4/5 + 10,
ry: 0,
rx: 20,
//originX: 'center',
//originY: 'center'
});
//add dummy content
fabric.Image.fromURL('image/bordenconfigurator/dummies/footer.png', function(oImg) {
oImg.set({
top: canvasBHeight- strokeBWidth-shadowBVal,
});
group.add(oImg);
canvasBuild.centerObjectH(oImg);
console.log('group '+i+' '+customPosition[i]+':');
console.log(JSON.stringify(group));
});
}else{
console.log(customPosition[i]);
//body positioning
var height,top;
if (hasHeader === true && hasFooter === true){
height = canvField*3/5 + 5;
top = strokeBWidth + canvField/5 + 5;
}else if(hasHeader ===true && hasFooter === false){
height = canvField*4/5 + 5;
top = strokeBWidth + canvField/5 + 5;
}else if(hasHeader ===false && hasFooter === true){
height = canvField*4/5;
top = strokeBWidth + 5;
}
var group = new fabric.Group([],{
left: strokeBWidth + 10,
stroke: '#ddd',
strokeLineJoin: 'round',
strokeWidth: 2,
hasControls: true,
lockMovementX: false,
lockMovementY: false,
lockRotation: true,
selectable: true,
position: posB,
fill: 'rgba(255,255,255,0)',
width: ((canvasBWidth - shadowBVal*2) - strokeBWidth*2 - 10),
height: height,
//top: strokeBWidth + canvField/5 + 5,
top: top,
ry: 20,
rx: 20
});
}
group.toObject = (function(toObject) {
return function() {
return fabric.util.object.extend(toObject.call(this), {
customPosition: this.customPosition,
label: this.label,
id: this.id
});
};
})(group.toObject);
group.customPosition = customPosition[i];
group.id = posB;
canvasBuild.add(group);
group.length = 0;
posB++;
}
//addOrientationLines();
//canvasBuild.renderAll();
//console.log(JSON.stringify(canvasBuild));
});
网格为JFrame（使用JPanels）。每个Borderlayout都包含JPanel（由于位于JButton内，因此会扩展为完整大小）。所以我有像扫雷一样的东西。
这些按钮有一个监听器，带有构造函数Listener（面板），所以我可以使用监听器中的面板。
如果我在监听器中执行Borderlayout，则按钮会消失，但panel.removeAll();仍然存在，因此我可以获得一个可用空间。
我做JPanel并且它有效，但如果我想添加一个组件，例如另一个按钮或panel.setBackground(Color.pink);，它就不起作用。它可以在同一个类中工作但不能分开，或者在类的方法中工作。
谢谢。希望你能理解！
这是我的听众课程：
JLabel这里是创建网格的类：
public class ListenerCasillas implements ActionListener {
JPanel panel;
ListenerCasillas(JPanel panel){
this.panel = panel;
}
@Override
public void actionPerformed(ActionEvent e) {
panel.removeAll();//works
panel.setBackground(Color.green);//works
panel.add(new JLabel("1"));//doesn't work
panel.repaint();//works
}
}
完整的java项目（如果你想测试）： https://drive.google.com/file/d/0B0WNwgY4eOjvNmNHM0E5U0FxVGc/view?usp=sharing
答案 0 :(得分：1)
解决方法是在revalidate() ListenerCasillas方法中调用actionPerformed()
public class ListenerCasillas implements ActionListener {
JPanel panel;
ListenerCasillas(JPanel panel){
this.panel = panel;
}
@Override
public void actionPerformed(ActionEvent e) {
panel.removeAll();
panel.setBackground(Color.green);
panel.add(new JLabel("1"));
panel.revalidate();
panel.repaint();
}
}
有关repaint()和revalidate()的详细信息，请查看this brilliant answer。