问题描述
我有一个JPanel父级,里面有3个JPanel子级。他们目前都使用GridLayout并一起代表一个UML类。问题是,当我添加新属性或方法时,所有3个JPanel都会增长到相同的大小。
I have a JPanel parent with 3 JPanel children inside. They all currently make use of GridLayout and together represent a UML class. Problem is that when I add a new attribute or method, all 3 JPanel grow to the same size.
欲望行为是:
- 标题栏的大小始终保持不变每当添加方法或属性时。
- 添加方法时,只有方法面板增长,标题和属性面板的大小保持不变。
- 添加属性时,只有属性面板增长,其他面板大小保持不变。
父JPanel已经可以自动增长/只要添加方法/属性,缩小。我正在玩弄GridBagLayout atm,但我无法接近欲望的结果。
The parent JPanel already can automatically grow/shrink whenever a method/attribute is added. I'm toying around with GridBagLayout atm but I'm getting nowhere near the desire results.
我有一个简单(或更简单)的方法来解决这个问题吗?!
Is there a simple (or simpler) way for me to solve this?!
这里有几张照片可以显示我的情况。
Here is few pics to show my situation.
新创建的UML类=>
这是它当前的行为方式=>
A newly created UML class => this is how it currently behaves =>
但我希望这个=> 或者=> 或者=>
But I want this => or this=> or this =>
Edit2:为了清晰起见添加了新的图片。如果原始版本具有误导性,我非常抱歉。
added new pics for clarity. Im terribly sorry if original version was misleading.
Edit3:YESS!我已经整理好了!感觉就像永远!这是SSEEC:
YESS! I have sorted it! Felt like forever!! Here is the SSEEC:
子面板
import java.awt.Component;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.MouseEvent;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.event.MouseInputAdapter;
import javax.swing.event.MouseInputListener;
public class APanel extends JPanel{
private JTextField tf;
public APanel() {
this.setLayout(new GridLayout(0,1));
this.addMouseListener(mouseInputListener);
}
MouseInputListener mouseInputListener = new MouseInputAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
System.out.println("Adding a new text field!");
tf = MyTF.create("Double click");
addNewTF(tf);
Component source = (Component) e.getSource();
Container c = source.getParent();
while(true) {
if(c instanceof PPanel)
break;
else
c=c.getParent();
}
PPanel p = (PPanel) c;
p.expand();
}
};
public void addNewTF(JTextField tf) {
this.add(tf);
this.setSize(this.getWidth(), this.getHeight()+tf.getHeight());
this.revalidate();
this.repaint();
}
}
父面板:
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;
import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class PPanel extends JPanel{
//private APanel panel1;
private JPanel panel1;
private APanel panel2;
private APanel panel3;
public PPanel() {
this.setLayout(new BoxLayout(this , BoxLayout.Y_AXIS));
this.setBackground(Color.black);
panel1 = new JPanel();
panel1.setLayout(new GridLayout(0,1));
panel1.add(new JTextField("title"));
panel2 = new APanel();
panel2.setBorder(BorderFactory.createLineBorder(Color.red));
panel3 = new APanel();
panel3.setBorder(BorderFactory.createLineBorder(Color.black));
this.add(panel1);
this.add(Box.createRigidArea(new Dimension(0,1)));
this.add(panel2);
this.add(panel3);
}
public void expand() {
this.setSize(this.getWidth(), this.getHeight()+33);
this.revalidate();
this.repaint();
}
public static void main(String[] args) {
JFrame frame = new JFrame();
PPanel panel = new PPanel();
panel.setBounds(10, 10, 100, 150);
JPanel c = new JPanel(null);
c.add(panel);
frame.add(c);
frame.pack();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(new Dimension(350, 300));
frame.setTitle("Demo");
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
帮助类:
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.event.MouseEvent;
import javax.swing.JTextField;
import javax.swing.event.MouseInputAdapter;
import javax.swing.event.MouseInputListener;
public class MyTF {
public static JTextField create(String name) {
final JTextField tf = new JTextField(name);
System.out.println(tf.getPreferredSize());
tf.setPreferredSize(new Dimension(100,33));
tf.addMouseListener(mouseInputListener);
return tf;
}
static MouseInputListener mouseInputListener = new MouseInputAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
Component source = (Component) e.getSource();
Container c = source.getParent();
while(true) {
if(c instanceof PPanel)
break;
else if(c instanceof APanel)
{
c.dispatchEvent(e);
c = c.getParent();
break;
}
else
c=c.getParent();
}
c.dispatchEvent(e);
}
};
}
我放弃了使用GridBagLayout玩的efford,这对我来说太过分了。然后我按照建议尝试了borderLayout但是无法让它像我想要的那样工作。然后最后BoxLayout,它应该工作但我的代码中有一个错误!因此,当我尝试使用0verbose代码建议并使用它时,它失败了!直到我完成了SSEEC,最后编译并在我决定发布之前运行它(我此时几乎放弃了)然后我意识到它有效......可以在自己的空间中成长的面板,它们不要互相干扰。
I gave up the efford playing with GridBagLayout, it was just too much for me. Then I tried borderLayout as suggested but couldn't get it to work like I want it either. Then finally BoxLayout, it should had worked but there was a bug in my code! So when I tried out 0verbose code suggest and playing around with it, it failed! Not until, I finished up the SSEEC, did the final compile and run it before I decided to post (I practically gave up at this point) then I realised that it worked...The panel that can grow in their own space, they dont interfere with each other.
我就像WTF!
回到我的代码并比较它SSEEC并且有一个bug,扩展面板高度的代码在错误的地方所以他们有点喜欢吃彼此空间。
Went back to my code and compared it SSEEC and there was a bug, the code to expand the height of the panel was in wrong place so they sort of like eating into each other spaces.
更好!我可以指定中间框与其上方和下方的框之间的距离为一个像素。这意味着我仍然可以使用mKorbel的技巧来绘制背线来分隔这些框!
Better yet! I can specify the distance between the middle box with the box above and below it by one pixel. That means I can still use the trick by mKorbel to draw the back line seperating those boxes!
编辑4:有没有办法让我设置一个组件的大小?如果您运行SSEEC,您会注意到一旦添加了JTextField,它就是巨大的!它比容器大......
Edit 4: is there a way for me to set size of a component? If you run the SSEEC, you will notice that once the JTextField is added in, it's huge! It's bigger than the container...
推荐答案
我建议你使用BoxLayout。这是一个。使用胶水和刚性区域,您可以获得几乎所有所需的布局。在你的情况下,代码应该是这样的:
I suggest you to use BoxLayout. Here's a tutorial. Playing around with glues and rigid area you can obtain almost all desired layout. In your case the code should be somthing like this:
JPanel container = new JPanel();
container .setLayout(new BoxLayout(container , BoxLayout.Y_AXIS));
JPanel childTop = new JPanel();
JPanel childCenter = new JPanel();
JPanel childBottom = new JPanel();
childTop.setMaximumSize(...);
childBottom.setMaximumSize(...);
container.add(childTop);
container.add(Box.createVerticalGlue());
container.add(childCenter);
container.add(Box.createVerticalGlue());
container.add(childBottom);
当你需要插入一个新孩子时,记得把它插入正确的位置:胶水和儿童中心。
例如:
When you need to insert a new child, remember to insert it into the right position: between one of the glues and childCenter.For example:
container.add(newChild, 2) ;
这篇关于java哪个布局管理器适合这个任务?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!