更改卡片布局中的当前卡片,并在摇摆中使用滑动效果

时间:2012-07-05 11:43:47

标签: java swing cardlayout

我正在尝试使用幻灯片效果更改卡片布局中的当前可见效果。但是我在幻灯片的开头看到一个轻弹,我无法调试/解决。我怎么能避免那个电影?

以下是重现错误的示例代码:

import java.awt.CardLayout;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class Main {
    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel panel = new JPanel(new CardLayout());
        JLabel label1 = new JLabel("Harry Joy");
        panel.add(label1, "1");
        JLabel label2 = new JLabel("Harsh Raval");
        panel.add(label2, "2");
        frame.add(panel);
        frame.pack();
        frame.setVisible(true);
        for (int i = 0; i < 10; i++) {
            try {
                Thread.sleep(500L);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            label2.setLocation(label1.getX() + 10 - label1.getWidth(), label1.getY());
            label1.setLocation(label1.getX() + 10, label1.getY());
            label2.setVisible(true);
        }
        label2.setVisible(false);
        CardLayout cl = (CardLayout)panel.getLayout(); 
        cl.next(panel);
    }
}

首先显示label1(“Harry Joy”)。然后我让label2(“Harsh Raval”)可见,并尝试更改两者的位置以提供幻灯片效果。但是这里发生的事情是第一次两个标签都显示在彼此之上,然后它开始滑动。我怎么能阻止它,我的意思是将两个标签叠加在一起?如果你运行一次,你可以更好地理解我的意思。

3 个答案:

答案 0 :(得分:3)

主要问题是你正在踩着CardLayout的脚趾。 CardLayout都管理组件的边界(位置和大小)和可见性,所以你的循环在这里:

    for (int i = 0; i < 10; i++) {
        try {
            Thread.sleep(500L);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        label2.setLocation(label1.getX() + 10 - label1.getWidth(), label1.getY());
        label1.setLocation(label1.getX() + 10, label1.getY());
        label2.setVisible(true);
    }

与CardLayout的做法相冲突。默认情况下,CardLayout将自动显示您添加的第一个组件并隐藏所有其他组件。它还将所有组件的边界设置为相同的边界。

在第一次迭代结束时,label2的可见性发生变化(从false变为true),最终触发您的CardLayout重新执行组件布局,从而设置所有组件的边界达到相同的界限,这就是你看到重叠的原因。 CardLayout并不意味着同时可以看到多个组件。

请注意,您正在运行EDT(事件调度线程)中的所有这些,这真是一个坏主意。它可能会导致死锁和不可预测的行为(例如您在此处看到的行为)。

答案 1 :(得分:2)

答案 2 :(得分:2)

一些评论,可能只是评论

  • Thread.sleep的想法是正确的,但仅从Runnable.Thread开始

  • 对于Swing GUI,有Swing Timer

  • Swing Timer保证移动标准JComponents

  • 中的任何一个(没有闪烁)可见的LayoutManager

但在这个(我的代码示例)情况下,我再次使用Swing Timer,并且所有事件都将在EDT上完成,通过从Runnable生活自己的生活调用而不影响其余的Swing事件,GUI ei,

注意此问题基于AWT嵌套/继承,例如对于JComboBoxes弹出窗口(resize和doLayout())不起作用

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ShakingButtonDemo implements Runnable {

    private JButton button;
    private JRadioButton radioWholeButton;
    private JRadioButton radioTextOnly;

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

    @Override
    public void run() {
        radioWholeButton = new JRadioButton("The whole button");
        radioTextOnly = new JRadioButton("Button text only");
        radioWholeButton.setSelected(true);
        ButtonGroup bg = new ButtonGroup();
        bg.add(radioWholeButton);
        bg.add(radioTextOnly);
        button = new JButton("  Shake with this Button  ");
        button.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                shakeButton(radioWholeButton.isSelected());
            }
        });
        JPanel p1 = new JPanel();
        p1.setBorder(BorderFactory.createTitledBorder("Shake Options"));
        p1.setLayout(new GridLayout(0, 1));
        p1.add(radioWholeButton);
        p1.add(radioTextOnly);
        JPanel p2 = new JPanel();
        p2.setLayout(new GridLayout(0, 1));
        p2.add(button);
        JFrame frame = new JFrame();
        frame.setTitle("Shaking Button Demo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(p1, BorderLayout.NORTH);
        frame.add(p2, BorderLayout.SOUTH);
        frame.setSize(240, 160);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    private void shakeButton(final boolean shakeWholeButton) {
        final Point point = button.getLocation();
        final Insets margin = button.getMargin();
        final int delay = 75;
        Runnable r = new Runnable() {

            @Override
            public void run() {
                for (int i = 0; i < 30; i++) {
                    try {
                        if (shakeWholeButton) {
                            moveButton(new Point(point.x + 5, point.y));
                            Thread.sleep(delay);
                            moveButton(point);
                            Thread.sleep(delay);
                            moveButton(new Point(point.x - 5, point.y));
                            Thread.sleep(delay);
                            moveButton(point);
                            Thread.sleep(delay);
                        } else {// text only
                            setButtonMargin(new Insets(margin.top, margin.left + 3, margin.bottom, margin.right - 2));
                            Thread.sleep(delay);
                            setButtonMargin(margin);
                            Thread.sleep(delay);
                            setButtonMargin(new Insets(margin.top, margin.left - 2, margin.bottom, margin.right + 3));
                            Thread.sleep(delay);
                            setButtonMargin(margin);
                            Thread.sleep(delay);
                        }
                    } catch (InterruptedException ex) {
                        ex.printStackTrace();
                    }
                }
            }
        };
        Thread t = new Thread(r);
        t.start();
    }

    private void moveButton(final Point p) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                button.setLocation(p);
            }
        });
    }

    private void setButtonMargin(final Insets margin) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                button.setMargin(margin);
            }
        });
    }
}