java 小程序中的 JPanel 布局
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JPanel layout in applet
提问by hesselbom
I have a JPanel that is not part of a JFrame. For various reasons I have to call the panel's paint method through my own "update" method.
我有一个不属于 JFrame 的 JPanel。由于各种原因，我必须通过我自己的“更新”方法调用面板的绘制方法。
This is my code:
这是我的代码：
public void onLoad ()
{
panel = new JPanel ();
panel.setBounds (0,0,Main.WIDTH,Main.HEIGHT);
panel.setLayout (new BoxLayout (panel, BoxLayout.Y_AXIS));
addButton ("button1", panel);
addButton ("button2", panel);
}
private void addButton (String text, Container container)
{
JButton button = new JButton (text);
button.setPreferredSize (new Dimension (100,20));
button.setAlignmentX (Component.CENTER_ALIGNMENT);
container.add (button);
}
public void onRender (Graphics2D g)
{
panel.paint (g);
}
This only paints the panel's background color. If I add button.setBounds(...) in the addButton method then it does paint the buttons but not affected by the BoxLayout.
这只会绘制面板的背景颜色。如果我在 addButton 方法中添加 button.setBounds(...) 那么它会绘制按钮但不受 BoxLayout 的影响。
So I want the buttons to be affected by the BoxLayout obviously. I'm not that savvy on how exactly Swing works so I'm not sure how to do this. JFrame has a pack() method which I think is what I need but some equivalent for JPanels since JPanels doesn't have that method.
所以我希望按钮明显受到 BoxLayout 的影响。我对 Swing 的工作原理不太了解，所以我不确定如何做到这一点。JFrame 有一个 pack() 方法，我认为这是我需要的，但对于 JPanels 有一些等价物，因为 JPanels 没有那个方法。
回答by bragboy
I don't know what you're looking for, but for me this works well.
我不知道你在找什么，但对我来说这很有效。
import java.awt.Component;
import java.awt.Dimension;
import javax.swing.BoxLayout;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class TestApplet extends JApplet{
public static void main(String[] args){
new TestApplet();
}
public TestApplet(){
this.setSize(400,400);
this.add(getCustPanel());
this.setVisible(true);
}
private JPanel getCustPanel() {
JPanel panel = new JPanel ();
panel.setLayout (new BoxLayout(panel, BoxLayout.Y_AXIS));
addButton ("button1", panel);
addButton ("button2", panel);
return panel;
}
private void addButton (String text, JPanel container)
{
JButton button = new JButton (text);
button.setPreferredSize (new Dimension(100,20));
button.setAlignmentX (Component.CENTER_ALIGNMENT);
container.add (button);
}
}
