Java html中嵌入的小程序的强制大小限制

Java html中嵌入的小程序的强制大小限制,java,html,swing,applet,grid-layout,Java,Html,Swing,Applet,Grid Layout,我有一个带有GridLayout的Java小程序,其中包含我希望是方形的小部件,并且彼此紧密封装(因此它们的大小不受限制)。 但是,我希望GridLayout在屏幕太大或无法保持小部件的“方正性”之前占据尽可能多的空间。 请注意,GridLayout中的行数和列数不一定相等(网格作为一个整体可以是非正方形的) 此小程序通过此html文件显示 <html> <body> <applet code=client.Grid.class archive="

我有一个带有GridLayout的Java小程序,其中包含我希望是方形的小部件,并且彼此紧密封装(因此它们的大小不受限制)。
但是,我希望GridLayout在屏幕太大或无法保持小部件的“方正性”之前占据尽可能多的空间。
请注意,GridLayout中的行数和列数不一定相等(网格作为一个整体可以是非正方形的)

此小程序通过此html文件显示

<html>
<body>
<applet code=client.Grid.class 
        archive="program.jar"
        width=100% height=95%>
</applet>
</body>
</html>
我知道这忽略了“最小尺寸”的内容,但目前这并不重要。
屏幕位于边框布局的中心,包含其他小部件

getContentPane().add(screen, BorderLayout.CENTER);
getContentPane().add(otherWidgets, BorderLayout.PAGE_END);
我知道这不会使
屏幕
集中在它所拥有的空间中,但目前这并不是完全必要的,所以我想让事情尽可能简单


这根本不起作用;除了最小尺寸的东西外,与我之前的(通过Eclipse查看时;我甚至还没有达到html阶段)没有明显的区别。小程序仍在空闲时重新调整屏幕组件的大小,使单元格“不方形”。我做错了什么?

将网格布局容器作为唯一没有约束的组件放入网格包布局中,如中所示。这将使它居中

更新 当然,将它放在一个组件中,该组件返回一个首选大小,该大小等于它可以根据父级大小管理的最大正方形大小。例如在
SquarePanel

import java.awt.*;
import javax.swing.*;
import javax.swing.border.EmptyBorder;

/**
 * A square panel for rendering. NOTE: To work correctly, this must be the only
 * component in a parent with a layout that allows the child to decide the size.
 */
class SquarePanel extends JPanel {

    @Override
    public Dimension getPreferredSize() {
        Dimension d = super.getPreferredSize();
        System.out.println("Preferred Size: " + d);
        int w = (int) d.getWidth();
        int h = (int) d.getHeight();
        // Set s to the larger of the mimimum component width or height
        int s = (w > h ? w : h);
        Container c = getParent();
        if (c != null ){
            Dimension sz = c.getSize();
            if ( d.getWidth()<sz.getWidth() ) {
                // Increase w to the size available in the parent container
                w = (int)sz.getWidth();
                System.out.println("WxH: " + w + "x" + h);
                // recalculate s
                s = (w < h ? w : h);
            }
            if ( d.getHeight()<sz.getHeight()) {
                // Increase h to the size available in the parent container
                h = (int)sz.getHeight();
                System.out.println("WxH: " + w + "x" + h);
                // recalculate s
                s = (w < h ? w : h);
            }
        }
        // Use s as the basis of a square of side length s.
        System.out.println("Square Preferred Size: " + new Dimension(s, s));
        return new Dimension(s, s);
    }

    @Override
    public Dimension getMinimumSize() {
        return getPreferredSize();
    }

    @Override
    public Dimension getSize() {
        return getPreferredSize();
    }

    public static void main(String[] args) {
        Runnable r = new Runnable() {

            @Override
            public void run() {
                // the GUI as seen by the user (without frame)
                // A single component added to a GBL with no constraint
                // will be centered.
                JPanel gui = new JPanel(new GridBagLayout());
                gui.setBackground(Color.BLUE);

                SquarePanel p = new SquarePanel();
                p.setBorder(new EmptyBorder(5,15,5,15));
                p.setLayout(new GridLayout(3,0,2,2));
                for (int ii=1; ii<13; ii++) {
                    p.add(new JButton("" + ii));
                }
                p.setBackground(Color.red);
                gui.add(p);

                JFrame f = new JFrame("Demo");
                f.add(gui);
                // Ensures JVM closes after frame(s) closed and
                // all non-daemon threads are finished
                f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                // See https://stackoverflow.com/a/7143398/418556 for demo.
                f.setLocationByPlatform(true);

                // ensures the frame is the minimum size it needs to be
                // in order display the components within it
                f.pack();
                // should be done last, to avoid flickering, moving,
                // resizing artifacts.
                f.setVisible(true);
            }
        };
        // Swing GUIs should be created and updated on the EDT
        // http://docs.oracle.com/javase/tutorial/uiswing/concurrency/initial.html
        SwingUtilities.invokeLater(r);
    }
}

import java.awt.*;
导入javax.swing.*;
导入javax.swing.border.EmptyBorder;
/**
*用于渲染的方形面板。注意:要正确工作,这必须是唯一
*父级中的组件,其布局允许子级决定大小。
*/
类SquarePanel扩展了JPanel{
@凌驾
公共维度getPreferredSize(){
维度d=super.getPreferredSize();
System.out.println(“首选尺寸:+d”);
int w=(int)d.getWidth();
inth=(int)d.getHeight();
//将s设置为最小组件宽度或高度中的较大值
ints=(w>h?w:h);
容器c=getParent();
如果(c!=null){
维度sz=c.getSize();

如果(d.getWidth(),我不希望网格居中;我希望它尽可能扩展到可用空间,同时保持网格的恒定高宽比。我对SquarePanel如何决定其长度和宽度有点困惑。也就是说,
super.getPreferredSize()
给出的可用空间是什么?(注意,我的网格不需要相等的行到列,元素之间没有间距)我已经尝试实现了这一点(没有成功)更新了我的问题。我做错了什么?你能解释一下你计算适当大小的逻辑吗?什么变量代表可用空间?代码很难理解。
//使用s作为边长s的平方的基础。
以o结尾的单行注释更有意义吗ne?你试过骑getMinimumSize()吗?我知道大多数人都不喜欢它,但我通常会将LayoutManager设置为null,并使用我自己的Java i计算调用setBounds。也许你也可以这样做。如果小程序没有更改大小的事件,那么它可能不是自动的,尽管我认为应该。你可以在小程序上使用getParent,直到获得windowFor bett的实例er帮助更快,发布一个。无论孩子想要什么大小,
BorderLayout
CENTER
组件都将被拉伸到可用大小。将
JPanel
添加到
CENTER
并制作布局
gridbagloayout
。然后将
GridLayout(行、列)
添加到GBL。
import java.awt.*;
import javax.swing.*;
import javax.swing.border.EmptyBorder;

/**
 * A square panel for rendering. NOTE: To work correctly, this must be the only
 * component in a parent with a layout that allows the child to decide the size.
 */
class SquarePanel extends JPanel {

    @Override
    public Dimension getPreferredSize() {
        Dimension d = super.getPreferredSize();
        System.out.println("Preferred Size: " + d);
        int w = (int) d.getWidth();
        int h = (int) d.getHeight();
        // Set s to the larger of the mimimum component width or height
        int s = (w > h ? w : h);
        Container c = getParent();
        if (c != null ){
            Dimension sz = c.getSize();
            if ( d.getWidth()<sz.getWidth() ) {
                // Increase w to the size available in the parent container
                w = (int)sz.getWidth();
                System.out.println("WxH: " + w + "x" + h);
                // recalculate s
                s = (w < h ? w : h);
            }
            if ( d.getHeight()<sz.getHeight()) {
                // Increase h to the size available in the parent container
                h = (int)sz.getHeight();
                System.out.println("WxH: " + w + "x" + h);
                // recalculate s
                s = (w < h ? w : h);
            }
        }
        // Use s as the basis of a square of side length s.
        System.out.println("Square Preferred Size: " + new Dimension(s, s));
        return new Dimension(s, s);
    }

    @Override
    public Dimension getMinimumSize() {
        return getPreferredSize();
    }

    @Override
    public Dimension getSize() {
        return getPreferredSize();
    }

    public static void main(String[] args) {
        Runnable r = new Runnable() {

            @Override
            public void run() {
                // the GUI as seen by the user (without frame)
                // A single component added to a GBL with no constraint
                // will be centered.
                JPanel gui = new JPanel(new GridBagLayout());
                gui.setBackground(Color.BLUE);

                SquarePanel p = new SquarePanel();
                p.setBorder(new EmptyBorder(5,15,5,15));
                p.setLayout(new GridLayout(3,0,2,2));
                for (int ii=1; ii<13; ii++) {
                    p.add(new JButton("" + ii));
                }
                p.setBackground(Color.red);
                gui.add(p);

                JFrame f = new JFrame("Demo");
                f.add(gui);
                // Ensures JVM closes after frame(s) closed and
                // all non-daemon threads are finished
                f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                // See https://stackoverflow.com/a/7143398/418556 for demo.
                f.setLocationByPlatform(true);

                // ensures the frame is the minimum size it needs to be
                // in order display the components within it
                f.pack();
                // should be done last, to avoid flickering, moving,
                // resizing artifacts.
                f.setVisible(true);
            }
        };
        // Swing GUIs should be created and updated on the EDT
        // http://docs.oracle.com/javase/tutorial/uiswing/concurrency/initial.html
        SwingUtilities.invokeLater(r);
    }
}