Swing：如何将组件高度设置为容器的高度？ [英] Swing: How do I set a component height to the container's height?

问题描述

我想让一个组件占用Container的maximumAvailableHeight。例如，在我下面粘贴的代码中，我将根框架设置为800,600。我想设置只有那个帧的高度/宽度（我不想尝试像素化它的孩子）。如果我运行它，我会看到一个严重对齐的UI。

I want to make a component to occupy the maximumAvailableHeight of the Container. In the code that I have pasted below for example, I have made the root frame to be 800,600. I want to set the height/width of only that frame (and I do not want to try and pixelify its children). If I run this, I see a badly aligned UI.

首先，我想要一个面板（在根框架内）占据框架的100％高度（在这种情况下，800px减去绘制帧标题所需的小空间）。

Firstly, I want a panel (that is inside the root frame) to take up the 100% height of frame (in this case 800px minus that little space it takes for painting the frame title).

其次，在面板中我有一个树和文本区域。我希望他们两个都采取100％的高度，让树占30％，textArea采取70％的宽度（如果树扩展到10级，那么我可以使用ScrollPane）。

Secondly, inside the panel I have a tree and text area. I want both of them to take 100% height and let the tree take 30% and textArea take 70% width (if the tree is expanded to 10 levels then I am ok with ScrollPane).

了解这在HTML中最容易实现。只说高度= 100％，宽度为30％等我们就完成了。有人知道这是否可以在Swing中完成？ （我可以通过设置像素高度和布局管理器来实现这一点，但我正在寻找设置百分比高度和宽度的最干净的解决方案。）

Understand that this is easiest to achieve in HTML. Just say height=100% and width to be 30% etc and we are done. Does someone know if this can be done in Swing? (I can achieve this by setting pixel heights and layout manager but I am looking for the cleanest solution to set percentage heights and widths.)

package com.ekanathk.logger.gui;

import javax.swing.*;
import javax.swing.tree.DefaultMutableTreeNode;

public class TestFrame extends JFrame {
    public TestFrame() {
        super("Top Frame");
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        JPanel panel = new JPanel();
        JTree env = getEnvironmentTree();
        env.expandRow(0);
        panel.add(new JScrollPane(env));
        panel.add(new JTextArea("Some contents"));
        getContentPane().add(panel);
        setSize(800, 600);
        SwingUtil.centerComponentOnScreen(this);
        setVisible(true);
    }

    private JTree getEnvironmentTree() {
        DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");
        JTree tree = new JTree(root);
        DefaultMutableTreeNode one = new DefaultMutableTreeNode("One");
        root.add(one);
        one.add(new DefaultMutableTreeNode("under one.1"));
        one.add(new DefaultMutableTreeNode("under one.2"));
        root.add(new DefaultMutableTreeNode("two"));
        root.add(new DefaultMutableTreeNode("three"));
        return tree;
    }

    public static void main(String[] args) {
        new TestFrame();
    }
}

推荐答案

这使用GridBagLayout来做你想要的事情。您可以使用组件的setMinimumSize和setPreferedSize。

This uses GridBagLayout to do sort of what you want. You might play around with setMinimumSize and setPreferedSize of your components.

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;

import javax.swing.*;
import javax.swing.tree.DefaultMutableTreeNode;

public class TestFrame extends JFrame {
    private static final long serialVersionUID = 1L;

    public TestFrame()  {
        super("Top Frame");
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        JPanel panel = new JPanel(new GridBagLayout());

        JTree env = getEnvironmentTree();
        env.expandRow(0);

        GridBagConstraints c = new GridBagConstraints();
        c.fill = GridBagConstraints.BOTH;
        c.weightx=.7;
        c.weighty=1;

        c.gridx=0;
        c.gridy=0;
        c.gridheight=1;
        c.gridwidth=7;
        panel.add(new JScrollPane(env),c);

        c.weightx=.3;
        c.gridx=7;
        c.gridy=0;
        c.gridheight=1;
        c.gridwidth=GridBagConstraints.REMAINDER;
        panel.add(new JTextArea("Some contents"),c);

        add(panel);
        setSize(800, 600);
        setLocationRelativeTo(null);
        setVisible(true);
    }

    private JTree getEnvironmentTree() {
        DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");
        JTree tree = new JTree(root);
        DefaultMutableTreeNode one = new DefaultMutableTreeNode("One");
        root.add(one);
        one.add(new DefaultMutableTreeNode("under one.1"));
        one.add(new DefaultMutableTreeNode("under one.2"));
        root.add(new DefaultMutableTreeNode("two"));
        root.add(new DefaultMutableTreeNode("three"));
        return tree;
    }

    public static void main(String[] args) {
        new TestFrame();
    }
}

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