java - Card Layout 可以显示 Card Layout
问题描述
我现在正在学习如何使用CardLayout
,我发现我的项目可以使用CardLayout
插入CardLayout
. 据我所知,我可以将任何JPanel
或容器设置为CardLayout
项目/卡片,因此我编写了代码,它唯一显示的是第一个组合框
我尝试了很多可能性,输出基本相同。我只是不知道我还能做什么,这就是我向你寻求帮助的原因。
(是的,它是根据 Oracle 的代码制作的。我正在学习,好吗?我需要基础来了解它是如何工作的,然后我懒得重写它。这就是为什么我包含 Oracle 的版权)
/*
* Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of Oracle or the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package UserInterface;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;
public class Przyciski implements ItemListener {
public static final int WIDTH = 400;
public static final int HEIGHT = 50;
JPanel cards;
JPanel functions;
JComboBox cb;
JComboBox fccb;
final static String BUTTONPANEL = "Card with JButtons";
final static String TEXTPANEL = "Card with JTextField";
public void addComponentToPane(Container pane) {
JPanel functionChoosingPane = new JPanel(); //use FlowLayout
String functionChooseComboBoxItems[] = { "Time Schedule", "Test Card" };
fccb = new JComboBox(functionChooseComboBoxItems);
fccb.setEditable(false);
fccb.addItemListener(this);
functionChoosingPane.add(fccb);
JPanel comboBoxPane = new JPanel(); //use FlowLayout
String comboBoxItems[] = { BUTTONPANEL, TEXTPANEL };
cb = new JComboBox(comboBoxItems);
cb.setEditable(false);
cb.addItemListener(this);
comboBoxPane.add(cb);
JPanel card1 = new JPanel();
card1.add(new JButton("Button 1"));
card1.add(new JButton("Button 2"));
card1.add(new JButton("Button 3"));
JPanel card2 = new JPanel();
card2.add(new JTextField("TextField", 20));
JPanel testCard = new JPanel();
testCard.add(new JButton("Test Button"));
cards = new JPanel(new CardLayout());
cards.add(card1, BUTTONPANEL);
cards.add(card2, TEXTPANEL);
Container downPane = new Container();
downPane.add(comboBoxPane, BorderLayout.PAGE_START);
downPane.add(cards, BorderLayout.CENTER);
functions = new JPanel(new CardLayout());
functions.add(downPane, "Time Schedule");
functions.add(testCard, "Test card");
pane.add(functionChoosingPane, BorderLayout.PAGE_START);
pane.add(functions, BorderLayout.CENTER);
}
public void itemStateChanged(ItemEvent evt) {
CardLayout cl = (CardLayout) (cards.getLayout());
cl.show(cards, (String) evt.getItem());
}
private static void createAndShowGUI(){
JFrame frame = new JFrame("School organisation system");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Przyciski demo = new Przyciski();
demo.addComponentToPane(frame.getContentPane());
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
解决方案
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