java - 如何在java中均匀调整JFrame的大小，使其保持方形

Question

我需要我JFrame有一个平方大小。一开始我的框架具有相同的宽度和高度，即使在调整窗口大小后我也希望保持这种状态。我真的很想知道在componentResized方法中写什么。

Answer 1

例如，Thihara +1

import java.awt.Dimension;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.util.HashSet;
import java.util.Set;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

public class MirroredFrame extends JFrame {

    private static final long serialVersionUID = 1L;
    private State state;
    private String name;
    private Set<StateListener> listeners = new HashSet<StateListener>();

    public MirroredFrame(String name) {
        super(name);
        final String frameName = name;
        this.name = frameName;
        state = new State();
        addComponentListener(new ComponentAdapter() {

            @Override
            public void componentResized(ComponentEvent e) {
                state.setSize(getSize(), true);
            }

            @Override
            public void componentMoved(ComponentEvent e) {
                System.out.println("JFrame : " + frameName + ", location on the screen " + getLocation());
            }

            @Override
            public void componentShown(ComponentEvent e) {
                System.out.println("JFrame : " + frameName + " shown ");
            }

            @Override
            public void componentHidden(ComponentEvent e) {
                System.out.println("JFrame : " + frameName + " hidden ");
            }
        });
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }

    private void addListener(StateListener sl) {
        listeners.add(sl);
    }

    public void associateWith(MirroredFrame other) {
        other.addListener(new MirrorStateListener());
    }

    private class State {

        private Dimension size;

        public void setSize(Dimension newSize, boolean fireEvent) {
            if (newSize.equals(size)) {
                return;
            }
            int height = newSize.height;
            int widht = newSize.width;
            if (height > widht) {
                size = new Dimension(height, height);
            } else {
                size = new Dimension(widht, widht);
            }
            MirroredFrame.this.setSize(size);
            if (fireEvent) {
                for (StateListener sl : listeners) {
                    sl.sizeChanged(size);
                }
            }
        }
    }

    private static interface StateListener {

        void sizeChanged(Dimension newSize);
    }

    private class MirrorStateListener implements StateListener {

        @Override
        public void sizeChanged(Dimension newSize) {
            System.out.println("JFrame : " + name + " received and changed sizeChanged Event");
            state.setSize(newSize, false);
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                MirroredFrame f1 = new MirroredFrame("f1");
                MirroredFrame f2 = new MirroredFrame("f2");
                f1.associateWith(f2);
                f2.associateWith(f1);
                f1.setSize(300, 300);
                f2.setLocation(600, 10);
            }
        });
    }
}

Answer 2

Get the width and height of the JFrame after resizing using the getSize() method. Then pick one or perform some logical operations to get the size you want and the resize the JFrame to the new size using the JFrame's setSize(int width,int height) method. When you give the same value to width and height it will be square!