Question

我写了简单的java应用程序。一个窗口（JFrame ramka）包含3个元素：JButton，JComboBox和容器（包含JList）。我想重新安排这些元素的位置，这会导致问题。我想使用GridBagLayout，但是当我这样做时，我的容器消失了（或者它是1px large -.-），setSize也适用于JComboBox。当我不使用任何布局时，会显示带有JList的容器，但是调整JComboBox的大小不起作用，并且所有内容都重叠...通常它看起来像......它看起来并不是全部。

这里有我的问题：如何以及使用什么布局来重新组织我的组件和JFrame的位置？我使用NetBeans 7.2

package layouttest;

import java.awt.*;
import javax.swing.*;
import javax.swing.JList;
import java.util.ArrayList;
import java.awt.*;
import java.awt.GridBagLayout;
import java.awt.event.*;
import javax.swing.*;

public class Layouttest {
    public static void main(String[] args) {
        JFrame ramka = new JFrame();
        //ramka.setLayout(new GridLayout(4, 3));
        //ramka.setLayout(new GridBagLayout());
        String [] test = {"cos", "cos2", "cos3", "cos4", "cos5", "cos6", "cos7", "cos8", "cos9","cos10", "cos11", "cos12"};
        ArrayList<String> myList = new ArrayList<String>();
        myList.add("cos");
        myList.add("cos2");
        myList.add("cos3");
        myList.add("cos4");
        myList.add("cos5");
        myList.add("cos6");
        myList.add("cos7");
        myList.add("cos8");
        myList.add("cos9");
        myList.add("cos10");

        GridBagConstraints ogranicznik = new GridBagConstraints();
        ogranicznik.insets = new Insets(5, 10, 5, 5);
        ogranicznik.gridx = 0;
        ogranicznik.gridy = 0; 

        Container c = new Container();
        ramka.setSize(500, 500);
        c.setSize(100,100);

        JList lista = new JList(myList.toArray());
        JScrollPane sp = new JScrollPane(lista);
        JTextField txt = new JTextField("cos");
        c.add(sp);

        sp.setSize(100,100);
        lista.setSize(100, 100);
        ramka.add(c);
        ramka.add(txt);

        String[] dropBoxList = {"uno", "due", "tre"};
        final JComboBox listaRozwijalna = new JComboBox(dropBoxList);

        listaRozwijalna.setPrototypeDisplayValue("XXXXXXXXXXXXXXXXXXXX"); 
        listaRozwijalna.revalidate();
        listaRozwijalna.repaint();
        ramka.add(listaRozwijalna);

        c.revalidate();
        c.repaint();
        ramka.revalidate();
        ramka.setVisible(true);
        ramka.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        // TODO code application logic here
    }
}

@EDIT 我发现java在使用布局模型时显示容器有问题......

Answer 1

我已重新安排您的代码并添加到GridBagLayout中。我不得不猜测你想如何安排你的组件。

始终确保您的Swing组件位于Event Dispatch线程上。这就是主要方法的作用。
将GUI组件与数据定义分开。这样可以更轻松地验证GUI组件。
按照放置在主JPanel上的顺序定义GUI组件。
始终定义主要JPanel。这使您可以更灵活地使用布局管理器来定义GUI。
始终使用一个或多个布局管理器。

这是我的代码版本。

import java.awt.Component;
import java.awt.Container;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;

import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

public class Layouttest implements Runnable {

    protected Insets    ogranicznik = new Insets(5, 10, 5, 5);

    @Override
    public void run() {
        JFrame ramka = new JFrame();

        JPanel panel = new JPanel();
        panel.setLayout(new GridBagLayout());

        JTextField txt = new JTextField("cos");

        addComponent(panel, txt, 0, 0, 1, 1, ogranicznik,
                GridBagConstraints.LINE_START, GridBagConstraints.HORIZONTAL);

        JComboBox listaRozwijalna = new JComboBox(setDropBoxValues());

        addComponent(panel, listaRozwijalna, 1, 0, 1, 1, ogranicznik,
                GridBagConstraints.LINE_START, GridBagConstraints.HORIZONTAL);

        JList lista = new JList(setListValues());
        JScrollPane sp = new JScrollPane(lista);

        addComponent(panel, sp, 0, 1, 1, 1, ogranicznik,
                GridBagConstraints.LINE_START, GridBagConstraints.HORIZONTAL);

        ramka.add(panel);
        ramka.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        // ramka.setSize(500, 500);
        ramka.pack();
        ramka.setVisible(true);
    }

    protected void addComponent(Container container, Component component,
            int gridx, int gridy, int gridwidth, int gridheight, Insets insets,
            int anchor, int fill) {
        GridBagConstraints gbc = new GridBagConstraints(gridx, gridy,
                gridwidth, gridheight, 1.0D, 1.0D, anchor, fill, insets, 0, 0);
        container.add(component, gbc);
    }

    protected String[] setListValues() {
        String[] test = { "cos", "cos2", "cos3", "cos4", "cos5", "cos6",
                "cos7", "cos8", "cos9", "cos10", "cos11", "cos12" };
        return test;
    }

    protected String[] setDropBoxValues() {
        String[] dropBoxList = { "uno", "due", "tre" };
        return dropBoxList;
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Layouttest());
    }
}

Answer 2

我以其他方式做到了......我只是省略了容器......

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package layouttest;

import java.awt.*;
import javax.swing.*;
import javax.swing.JList;
import java.util.ArrayList;
import java.awt.*;
import java.awt.GridBagLayout;
import java.awt.event.*;
import javax.swing.*;


/**
 *
 * @author kula
 */
public class Layouttest {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        JFrame ramka = new JFrame();
       //ramka.setLayout(new GridLayout(4, 3));
        ramka.setLayout(new GridBagLayout());
        String [] test = {"cos", "cos2", "cos3", "cos4", "cos5", "cos6", "cos7", "cos8", "cos9","cos10", "cos11", "cos12"};
        ArrayList<String> myList = new ArrayList<String>();
        myList.add("cos");
        myList.add("cos2");
        myList.add("cos3");
        myList.add("cos4");
        myList.add("cos5");
        myList.add("cos6");
        myList.add("cos7");
        myList.add("cos8");
        myList.add("cos9");
        myList.add("cos10");

        GridBagConstraints ogranicznik = new GridBagConstraints();
//ogranicznik.insets = new Insets(5, 10, 5, 5);
ogranicznik.gridx = 0;
ogranicznik.gridy = 2; 

        Container c = new Container();
        ramka.setSize(500, 500);
   // c.setSize(100,100);

    final JScrollPane sp = new JScrollPane();
    JList lista = new JList(myList.toArray());

   sp.getViewport().add(lista);//!!!!!!!!!!!!!!!!!!

    //sp.removeAll();

    //c.add(sp);
   //sp.setViewportView(lista);
  // sp.setSize(100,100);
   //lista.setSize(100, 100);
    ramka.add(sp);




    String[] dropBoxList = {"uno", "due", "tre"};
    final JComboBox listaRozwijalna = new JComboBox(dropBoxList);


   /* listaRozwijalna.setPrototypeDisplayValue("XXXXXXXXXXXXXXXXXXXX"); 
    listaRozwijalna.revalidate();
    listaRozwijalna.repaint();*/
   // ramka.add(listaRozwijalna);


    c.revalidate();
    c.repaint();
    ramka.revalidate();


    ramka.setVisible(true);
    ramka.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        // TODO code application logic here
    }
}

GridBagLayout，消失了JList

2 个答案: