带下拉箭头的按钮（JSplitButton）

最新推荐文章于 2021-06-09 20:16:11 发布

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最新推荐文章于 2021-06-09 20:16:11 发布

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分类专栏： swing 文章标签： action string button border null email

本文链接：https://blog.youkuaiyun.com/wqjsir/article/details/6143436

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本文介绍了一个自定义的Java Swing组件——带下拉箭头的按钮。该组件实现了按钮左侧点击触发事件及右侧箭头点击弹出菜单的功能，并支持自定义样式如边框颜色等。

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最近需要用到带下拉箭头的按钮这样的组件，本来以为java是自带的有，在网上搜了N次，就是没有收到，最后就只有自己写了。写了几次，几次都觉得难看，后来又去网上搜，还是很令我失望，最后自己又硬着头皮来重写原来的了。现在终于写了一个自己比较满意的出来。先来看哈截图。

效果基本上还看得过去。

下面是具体代码：

/** * All rights reserved,2010,mengke */ package com.mengke.j2se.swing; import java.awt.BorderLayout; import java.awt.Color; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Insets; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.event.MouseMotionListener; import java.util.ArrayList; import java.util.List; import javax.swing.BorderFactory; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JPopupMenu; import javax.swing.JSeparator; /** *@author mengke * @email wqjsir@foxmail.com *@version 2011-1-15下午11:35:31 */ public class JSplitButton extends JButton { private static final long serialVersionUID = -7431955200320586601L; private JLabel textLabel = new JLabel(); private JLabel arrowButton = new JLabel(); private JPanel separatePanel = new JPanel(new BorderLayout()); private JPanel textPanel = new JPanel(new GridBagLayout()); private JPanel arrowButtonPanel = new JPanel(new GridBagLayout()); private JSeparator separator = new JSeparator(JSeparator.NORTH); private boolean separatorVisible = true; private boolean locationLeft = true; private JPopupMenu optionPopMenu; private JPopupMenu buttonPopMenu; private List<ActionListener> listeners = new ArrayList<ActionListener>(); private static Color DEFAULT_BORDER_COLOR = Color.LIGHT_GRAY; private Color borderColor =DEFAULT_BORDER_COLOR; public JSplitButton() { decorate(); } public JSplitButton(String text) { textLabel.setText(text); decorate(); } public JSplitButton(Icon icon) { textLabel.setIcon(icon); decorate(); } public JSplitButton(String text, Icon icon) { textLabel.setText(text); textLabel.setIcon(icon); decorate(); } protected void decorate() { setLayout(new GridBagLayout()); separatePanel.setOpaque(false); arrowButtonPanel.setOpaque(false); textPanel.setOpaque(false); //这里主要是给分割条占一个位置，如果不约束的话，则在显示和隐藏分割条时，按钮界面就会扭动 separatePanel.setPreferredSize(new Dimension(2, 10)); separatePanel.add(separator, BorderLayout.CENTER); arrowButton.setIcon(new ImageIcon("./images/option_7x7.png")); arrowButtonPanel.add(arrowButton, new GridBagConstraints(0, 0, 1, 1, 1, 1, GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 2, 0, 2), 0, 0)); arrowButtonPanel.setBorder(BorderFactory.createEmptyBorder(1, 0, 1, 1)); textPanel.add(textLabel, new GridBagConstraints(0, 0, 1, 1, 1, 1, GridBagConstraints.WEST, GridBagConstraints.BOTH, new Insets(0, 2, 0, 2), 0, 0)); textPanel.setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 0)); add(textPanel, new GridBagConstraints(0, 0, 1, 1, 1, 1, GridBagConstraints.WEST, GridBagConstraints.BOTH, new Insets(0, 0, 0, 0), 0, 0)); add(separatePanel, new GridBagConstraints(1, 0, 1, 1, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.VERTICAL, new Insets(0, 0, 0, 0), 0, 0)); add(arrowButtonPanel, new GridBagConstraints(2, 0, 1, 1, 1, 1, GridBagConstraints.EAST, GridBagConstraints.BOTH, new Insets(0, 0, 0, 0), 0, 0)); setMargin(new Insets(0, 0, 0, 0)); addMouseListener(new MouseAdapter() { public void mouseEntered(MouseEvent e) { if (isEnabled()) { separator.setVisible(true); } } public void mouseExited(MouseEvent e) { EventQueue.invokeLater(new Runnable() { @Override public void run() { arrowButton.setIcon(new ImageIcon("./images/option_7x7.png")); if (!isSeparatorVisible()) { separator.setVisible(false); } textPanel.setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 0)); arrowButtonPanel.setBorder(BorderFactory.createEmptyBorder(1, 0, 1, 1)); } }); } @Override public void mouseClicked(final MouseEvent e) { EventQueue.invokeLater(new Runnable() { @Override public void run() { int x = separatePanel.getX(); if (e.getPoint().x > x) { arrowButton.setIcon(new ImageIcon("./images/option_7x9.png")); if (optionPopMenu != null) { if(locationLeft){ optionPopMenu.show(JSplitButton.this, 0, JSplitButton.this.getHeight()); }else{ optionPopMenu.show(arrowButtonPanel, 0, arrowButtonPanel.getHeight()); } } } else { for (ActionListener action : listeners) { ActionEvent actionEvent = new ActionEvent(JSplitButton.this, ActionEvent.ACTION_FIRST, ""); action.actionPerformed(actionEvent); } if(buttonPopMenu!=null){ buttonPopMenu.show(JSplitButton.this, 0, JSplitButton.this.getHeight()); } } } }); } @Override public void mouseReleased(MouseEvent e) { EventQueue.invokeLater(new Runnable() { @Override public void run() { arrowButton.setIcon(new ImageIcon("./images/option_7x7.png")); arrowButton.updateUI(); } }); } }); addMouseMotionListener(new MouseMotionListener() { @Override public void mouseDragged(MouseEvent e) { } @Override public void mouseMoved(MouseEvent e) { int x = separatePanel.getX(); if (e.getPoint().x > x) { arrowButtonPanel.setBorder(BorderFactory.createMatteBorder(1, 0, 1, 1,borderColor)); textPanel.setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 0)); } else { textPanel.setBorder(BorderFactory.createMatteBorder(1, 1, 1, 0, borderColor)); arrowButtonPanel.setBorder(BorderFactory.createEmptyBorder(1, 0, 1, 1)); } } }); } /** * 获得中间的分割条是否显示。为true时表示，一直显示，为false时表示单鼠标进入才显示。默认为true，即一直显示 * * @return */ public boolean isSeparatorVisible() { return separatorVisible; } /** * 设置中间的分割条是否显示。为true时表示，一直显示，为false时表示单鼠标进入才显示。默认为true，即一直显示 * * @param separatorVisible */ public void setSeparatorVisible(boolean separatorVisible) { this.separatorVisible = separatorVisible; separator.setVisible(separatorVisible); } /** * 获取右边箭头按钮菜单的菜单显示对其方式。true表示与按钮左边对齐，false表示与箭头按钮对齐。默认为左对齐 * @return */ public boolean isLocationLeft() { return locationLeft; } /** * 设置右边箭头按钮菜单的菜单显示对其方式。true表示与按钮左边对齐，false表示与箭头按钮对齐。默认为左对齐 * @param locationLeft */ public void setLocationLeft(boolean locationLeft) { this.locationLeft = locationLeft; } /** * 获得鼠标进入按钮时绘制的边框的颜色。默认为Color.LIGHT_GRAY * * @return */ public Color getBorderColor() { return borderColor; } /** * 设置鼠标进入按钮时绘制的边框的颜色。默认为Color.LIGHT_GRAY * * @param borderColor */ public void setBorderColor(Color borderColor) { if(borderColor==null){ throw new IllegalArgumentException("边框颜色不能为空"); } this.borderColor = borderColor; } /** * 添加按钮监听事件，这里添加到的是按钮左边部分的事件监听。 */ public void addActionListener(ActionListener action) { listeners.add(action); } /** * 移除按钮监听事件。 */ public void removeActionListener(ActionListener action) { listeners.remove(action); } /** * 设置按钮的文本内容。这里设置到按钮左边部分。 */ @Override public void setText(String text) { textLabel.setText(text); } /** * 覆盖父类的设置图标方法。设置按钮的图标，这里是设置按钮左边部分图标。 */ @Override public void setIcon(Icon icon){ textLabel.setIcon(icon); } /** * 设置点击右边箭头按钮时的菜单 * * @param popupMenu */ public void setOptionPopMenu(JPopupMenu popupMenu) { this.optionPopMenu = popupMenu; } /** * 获取右边箭头按钮的菜单 * * @return */ public JPopupMenu getOptionPopMenu() { return optionPopMenu; } /** * 获得按钮左边部分菜单 * * @return */ public JPopupMenu getButtonPopMenu() { return buttonPopMenu; } /** * 设置箭头左边部分菜单 * * @param buttonPopMenu */ public void setButtonPopMenu(JPopupMenu buttonPopMenu) { this.buttonPopMenu = buttonPopMenu; } }

再贴出测试类代码如下：

/** * All rights reserved,2010,mengke */ package com.mengke.j2se.ui.test; import java.awt.Color; import java.awt.Dimension; import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JFrame; import javax.swing.JMenuItem; import javax.swing.JPanel; import javax.swing.JPopupMenu; import com.mengke.j2se.swing.JSplitButton; /** *@author mengke * @email wqjsir@foxmail.com *@version 2011-1-15下午11:35:31 */ public class JSplitButtonTest { public static void main(String[] args) { JSplitButton button = new JSplitButton("splitButton"); button.setSeparatorVisible(false); button.setBorderColor(Color.green); button.setLocationLeft(false); //button.setIcon(new ImageIcon("./images/option_7x7.png")); button.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { System.out.println("点击了按钮左边部分"); } }); JFrame frame = new JFrame(); JPanel panel = new JPanel(new FlowLayout(FlowLayout.CENTER,20,20)); JPopupMenu popMenu = new JPopupMenu(); popMenu.add(new JMenuItem("Item1")); popMenu.add(new JMenuItem("Item2")); popMenu.add(new JMenuItem("Item3")); button.setOptionPopMenu(popMenu); panel.add(button); frame.add(panel); frame.setSize(new Dimension(200, 300)); frame.setVisible(true); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } }

一切OK了。