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我编写了以下用于开发 JTabbedPane“选项卡组件”的代码。我在自定义选项卡式 Pane 中使用 setTabComponentAt(index, tabComponent) 进行设置。
package com.example.tabpane;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import javax.swing.JLabel;
import javax.swing.event.EventListenerList;
import com.example.SwingUtilities;
public class TabComponent extends JLabel {
private Point mousePointerAt;
private Dimension crossIconDim = new Dimension(15, 15);
private int crossIconDimLeftPadding = 5;
private EventListenerList eventListeners = new EventListenerList();
public TabComponent() {
initComponent();
}
public TabComponent(String title) {
super(title);
setOpaque(false);
initComponent();
}
//You don't have to override the getSize() versions. It basically calls getWidth() and getHeight()
//Also you should NOT override getWidth() and getHeight() because the layout managers set that properties
//If you do the borders right/bottom edges won't be painted correctly
@Override
public Dimension getPreferredSize() {
Dimension preferredSize = super.getPreferredSize();
int width = (int)preferredSize.getWidth();
int height = (int)preferredSize.getHeight();
width += crossIconDim.getWidth() + crossIconDimLeftPadding;
height = Math.max(height, (int) crossIconDim.getHeight());
Dimension newSize = new Dimension(width, height);
return newSize;
}
@Override
public Dimension getMinimumSize() {
Dimension preferredSize = super.getMinimumSize();
int width = (int)preferredSize.getWidth();
int height = (int)preferredSize.getHeight();
width += crossIconDim.getWidth() + crossIconDimLeftPadding;
height = Math.max(height, (int) crossIconDim.getHeight());
Dimension newSize = new Dimension(width, height);
return newSize;
}
@Override
public Dimension getMaximumSize() {
Dimension preferredSize = super.getMaximumSize();
int width = (int)preferredSize.getWidth();
int height = (int)preferredSize.getHeight();
width += crossIconDim.getWidth() + crossIconDimLeftPadding;
height = Math.max(height, (int) crossIconDim.getHeight());
Dimension newSize = new Dimension(width, height);
return newSize;
}
private void initComponent() {
addMouseMotionListener(new MouseMotionAdapter() {
@Override
public void mouseMoved(MouseEvent e) {
SwingUtilities.bubbleEvent(e);
TabComponent tab = (TabComponent) e.getComponent();
tab.mousePointerAt = e.getPoint();
tab.repaint();
}
});
addMouseListener(new MouseAdapter() {
@Override
public void mouseExited(MouseEvent e) {
SwingUtilities.bubbleEvent(e);
TabComponent tab = (TabComponent) e.getComponent();
tab.mousePointerAt = null;
tab.repaint();
}
@Override
public void mouseClicked(MouseEvent e) {
SwingUtilities.bubbleEvent(e);
TabComponent tab = (TabComponent) e.getComponent();
if (tab.mousePointerAt != null) {
int componentWidth = tab.getWidth();
Insets insets = tab.getInsets();
Point gfxXlatePoint = new Point(componentWidth - (int) crossIconDim.getWidth() - insets.right, insets.top);
Rectangle paintRectangle = new Rectangle(gfxXlatePoint, crossIconDim);
if (mousePointerAt != null) {
if (paintRectangle.contains(mousePointerAt)) {
tab.fireTabEvent(new TabEvent(tab, TabEvent.TAB_CLOSING));
}
}
}
}
});
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D gfx = (Graphics2D) g.create();
int componentWidth = getWidth();
int ovalRadius = (int) (crossIconDim.getWidth());
Insets insets = getInsets();
Point gfxXlatePoint = new Point(componentWidth - (int) crossIconDim.getWidth() - insets.right, insets.top);
Rectangle paintRectangle = new Rectangle(gfxXlatePoint, crossIconDim);
gfx.translate(gfxXlatePoint.x, gfxXlatePoint.y);
boolean mouseOverCloseCue = false;
if (mousePointerAt != null) {
if (paintRectangle.contains(mousePointerAt)) {
mouseOverCloseCue = true;
}
}
gfx.setStroke(new BasicStroke(2));
gfx.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
Insets crossIconPadding = new Insets(5, 5, 5, 5);
if (mouseOverCloseCue) {
gfx.setColor(new Color(0xf49f94));
//The mouse pointer is on the x mark
gfx.fillOval(0, 0, ovalRadius, ovalRadius);
gfx.setColor(Color.WHITE);
gfx.drawLine(0 + crossIconPadding.left, 0 + crossIconPadding.top, (int)crossIconDim.getWidth() - crossIconPadding.right, (int)crossIconDim.getHeight() - crossIconPadding.bottom);
gfx.drawLine((int)crossIconDim.getWidth() - crossIconPadding.right, 0 + crossIconPadding.top, 0 + crossIconPadding.left, (int)crossIconDim.getHeight() - crossIconPadding.bottom);
} else {
gfx.setColor(Color.BLACK);
gfx.drawLine(0 + crossIconPadding.left, 0 + crossIconPadding.top, (int)crossIconDim.getWidth() - crossIconPadding.right, (int)crossIconDim.getHeight() - crossIconPadding.bottom);
gfx.drawLine((int)crossIconDim.getWidth() - crossIconPadding.right, 0 + crossIconPadding.top, 0 + crossIconPadding.left, (int)crossIconDim.getHeight() - crossIconPadding.bottom);
}
gfx.dispose();
}
public void addTabEventListener(TabEventListener listener) {
eventListeners.add(TabEventListener.class, listener);
}
public void removeTabEventListener(TabEventListener listener) {
eventListeners.remove(TabEventListener.class, listener);
}
protected void fireTabEvent(TabEvent evt) {
Object[] listeners = eventListeners.getListeners(TabEventListener.class);
for (int i = 0, n = listeners.length; i < n; i++) {
((TabEventListener) listeners[i]).handleEvent(evt);
}
}
}
以下代码是我自定义的JTabbedPane
package com.example.tabpane;
import java.awt.Component;
import javax.swing.JTabbedPane;
public class ClosingTabbedPane extends JTabbedPane {
/**
*
*/
private static final long serialVersionUID = 1L;
public ClosingTabbedPane() {
}
@Override
public void addTab(String title, Component component) {
super.addTab(title, component);
final int index = getTabCount() - 1;
TabComponent tabLabel = new TabComponent(title);
tabLabel.addTabEventListener(new TabEventListener() {
@Override
public void handleEvent(TabEvent evt) {
if (evt.getEventType() == TabEvent.TAB_CLOSING) {
ClosingTabbedPane.this.removeTabAt(index);
}
}
});
setTabComponentAt(index, tabLabel);
}
}
问题是,选项卡组件不起作用,因为它正在消耗鼠标事件。当用户单击选项卡组件时,TabbedPane 不会像预期的那样更改选项卡。我可以自己处理点击并更改可见的选项卡,但我在想是否是另一种让事件冒泡的方法。我试图编写一个通用的事件起泡器,但它正在引发 StackOverflowError。
package com.example;
import java.awt.AWTEvent;
import java.awt.Component;
import java.awt.Container;
public class SwingUtilities {
public static void bubbleEvent(AWTEvent event) {
Component source = (Component) event.getSource();
Container parent = source.getParent();
int i = 0, deep = 10;
while (parent != null && i < deep) {
i++;
System.out.println("Dispatching to the parent with i = " + i);
parent.dispatchEvent(event);
parent = parent.getParent();
}
}
}
最佳答案
你想错了。
为什么不创建一个 CloseIcon
类,然后将其包含在 TabComponent
中,而不是创建一个尝试同时执行这两种操作的单一、全包罗类。
这样,您就可以分离逻辑并隔离责任,而无需诉诸肮脏的黑客和变通方法来使其工作
(抱歉,我对您的代码进行了一些改动)
关闭图标
所有这一切只是绘制关闭图标并响应鼠标事件。单击时,它会触发一个 ActionEvent
(作为通用事件)供其他组件监听...
public class CloseIcon extends JPanel {
private static final Dimension CROSS_ICON_SIZE = new Dimension(15, 15);
private static final int CROSS_ICON_INSET = 5;
private boolean mouseInTheHouse = false;
public CloseIcon() {
setOpaque(false);
addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
fireActionPerformed();
}
@Override
public void mouseEntered(MouseEvent e) {
mouseInTheHouse = true;
}
@Override
public void mouseExited(MouseEvent e) {
mouseInTheHouse = false;
}
});
}
public void addActionListener(ActionListener listener) {
listenerList.add(ActionListener.class, listener);
}
protected void fireActionPerformed() {
ActionListener[] listeners = listenerList.getListeners(ActionListener.class);
if (listeners.length > 0) {
ActionEvent evt = new ActionEvent(this, ActionEvent.ACTION_PERFORMED, "Closed");
for (ActionListener listener : listeners) {
listener.actionPerformed(evt);
}
}
}
//You don't have to override the getSize() versions. It basically calls getWidth() and getHeight()
//Also you should NOT override getWidth() and getHeight() because the layout managers set that properties
//If you do the borders right/bottom edges won't be painted correctly
@Override
public Dimension getPreferredSize() {
return new Dimension(CROSS_ICON_SIZE.width + CROSS_ICON_INSET, CROSS_ICON_SIZE.height);
}
@Override
public Dimension getMinimumSize() {
return getPreferredSize();
}
@Override
public Dimension getMaximumSize() {
return getPreferredSize();
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D gfx = (Graphics2D) g.create();
int componentWidth = getWidth();
int ovalRadius = (int) (CROSS_ICON_SIZE.getWidth());
Insets insets = getInsets();
Point gfxXlatePoint = new Point(componentWidth - (int) CROSS_ICON_SIZE.getWidth() - insets.right, insets.top);
Rectangle paintRectangle = new Rectangle(gfxXlatePoint, CROSS_ICON_SIZE);
gfx.translate(gfxXlatePoint.x, gfxXlatePoint.y);
gfx.setStroke(new BasicStroke(2));
gfx.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
Insets crossIconPadding = new Insets(5, 5, 5, 5);
if (mouseInTheHouse) {
gfx.setColor(new Color(0xf49f94));
//The mouse pointer is on the x mark
gfx.fillOval(0, 0, ovalRadius, ovalRadius);
gfx.setColor(Color.WHITE);
gfx.drawLine(0 + crossIconPadding.left, 0 + crossIconPadding.top, (int) CROSS_ICON_SIZE.getWidth() - crossIconPadding.right, (int) CROSS_ICON_SIZE.getHeight() - crossIconPadding.bottom);
gfx.drawLine((int) CROSS_ICON_SIZE.getWidth() - crossIconPadding.right, 0 + crossIconPadding.top, 0 + crossIconPadding.left, (int) CROSS_ICON_SIZE.getHeight() - crossIconPadding.bottom);
} else {
gfx.setColor(Color.BLACK);
gfx.drawLine(0 + crossIconPadding.left, 0 + crossIconPadding.top, (int) CROSS_ICON_SIZE.getWidth() - crossIconPadding.right, (int) CROSS_ICON_SIZE.getHeight() - crossIconPadding.bottom);
gfx.drawLine((int) CROSS_ICON_SIZE.getWidth() - crossIconPadding.right, 0 + crossIconPadding.top, 0 + crossIconPadding.left, (int) CROSS_ICON_SIZE.getHeight() - crossIconPadding.bottom);
}
gfx.dispose();
}
}
选项卡组件
TabComponent
只是一个带有 JLabel
和 CloseIcon
的 JPanel
。该组件监听 ActionEvents
的 CloseIcon
,然后使用它触发 TabEvent
public class TabComponent extends JPanel {
private CloseIcon closeIcon;
public TabComponent(String title) {
setLayout(new GridBagLayout());
setOpaque(false);
JLabel lblTitle = new JLabel(title);
closeIcon = new CloseIcon();
closeIcon.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
fireTabEvent(new TabEvent(this));//, TabEvent.TAB_CLOSING));
}
});
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 1;
gbc.anchor = GridBagConstraints.WEST;
add(lblTitle, gbc);
gbc.gridx++;
gbc.weightx = 0;
gbc.anchor = GridBagConstraints.NORTHEAST;
add(closeIcon);
}
public void addTabEventListener(TabEventListener listener) {
listenerList.add(TabEventListener.class, listener);
}
public void removeTabEventListener(TabEventListener listener) {
listenerList.remove(TabEventListener.class, listener);
}
protected void fireTabEvent(TabEvent evt) {
Object[] listeners = listenerList.getListeners(TabEventListener.class);
for (int i = 0, n = listeners.length; i < n; i++) {
((TabEventListener) listeners[i]).handleEvent(evt);
}
}
}
import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.EventListener;
import java.util.EventObject;
import javaapplication222.Test.TestPane;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new BorderLayout());
ClosingTabbedPane ctp = new ClosingTabbedPane();
ctp.addTab("Bananas", createPanel("Hello"));
ctp.addTab("Apples", createPanel("Kanchiwa"));
add(ctp);
}
protected JPanel createPanel(String msg) {
JPanel panel = new JPanel(new GridBagLayout());
JLabel label = new JLabel(msg);
MouseAdapter ma = new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
System.out.println("clicked");
}
@Override
public void mouseEntered(MouseEvent e) {
System.out.println("in");
}
@Override
public void mouseExited(MouseEvent e) {
System.out.println("out");
}
};
label.addMouseListener(ma);
label.addMouseMotionListener(ma);
panel.add(label);
return panel;
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
}
public class ClosingTabbedPane extends JTabbedPane {
/**
*
*/
private static final long serialVersionUID = 1L;
public ClosingTabbedPane() {
}
@Override
public void addTab(String title, Component component) {
super.addTab(title, component);
final int index = getTabCount() - 1;
TabComponent tabLabel = new TabComponent(title);
tabLabel.addTabEventListener(new TabEventListener() {
@Override
public void handleEvent(TabEvent evt) {
System.out.println("Boo");
// if (evt.getEventType() == TabEvent.TAB_CLOSING) {
// ClosingTabbedPane.this.removeTabAt(index);
// }
}
});
setTabComponentAt(index, tabLabel);
}
}
public class TabEvent extends EventObject {
public TabEvent(Object source) {
super(source);
}
}
public interface TabEventListener extends EventListener {
public void handleEvent(TabEvent evt);
}
public static class CloseIcon extends JPanel {
private static final Dimension CROSS_ICON_SIZE = new Dimension(15, 15);
private static final int CROSS_ICON_INSET = 5;
private boolean mouseInTheHouse = false;
public CloseIcon() {
setOpaque(false);
addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
fireActionPerformed();
}
@Override
public void mouseEntered(MouseEvent e) {
mouseInTheHouse = true;
}
@Override
public void mouseExited(MouseEvent e) {
mouseInTheHouse = false;
}
});
}
public void addActionListener(ActionListener listener) {
listenerList.add(ActionListener.class, listener);
}
protected void fireActionPerformed() {
ActionListener[] listeners = listenerList.getListeners(ActionListener.class);
if (listeners.length > 0) {
ActionEvent evt = new ActionEvent(this, ActionEvent.ACTION_PERFORMED, "Closed");
for (ActionListener listener : listeners) {
listener.actionPerformed(evt);
}
}
}
//You don't have to override the getSize() versions. It basically calls getWidth() and getHeight()
//Also you should NOT override getWidth() and getHeight() because the layout managers set that properties
//If you do the borders right/bottom edges won't be painted correctly
@Override
public Dimension getPreferredSize() {
return new Dimension(CROSS_ICON_SIZE.width + CROSS_ICON_INSET, CROSS_ICON_SIZE.height);
}
@Override
public Dimension getMinimumSize() {
return getPreferredSize();
}
@Override
public Dimension getMaximumSize() {
return getPreferredSize();
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D gfx = (Graphics2D) g.create();
int componentWidth = getWidth();
int ovalRadius = (int) (CROSS_ICON_SIZE.getWidth());
Insets insets = getInsets();
Point gfxXlatePoint = new Point(componentWidth - (int) CROSS_ICON_SIZE.getWidth() - insets.right, insets.top);
Rectangle paintRectangle = new Rectangle(gfxXlatePoint, CROSS_ICON_SIZE);
gfx.translate(gfxXlatePoint.x, gfxXlatePoint.y);
gfx.setStroke(new BasicStroke(2));
gfx.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
Insets crossIconPadding = new Insets(5, 5, 5, 5);
if (mouseInTheHouse) {
gfx.setColor(new Color(0xf49f94));
//The mouse pointer is on the x mark
gfx.fillOval(0, 0, ovalRadius, ovalRadius);
gfx.setColor(Color.WHITE);
gfx.drawLine(0 + crossIconPadding.left, 0 + crossIconPadding.top, (int) CROSS_ICON_SIZE.getWidth() - crossIconPadding.right, (int) CROSS_ICON_SIZE.getHeight() - crossIconPadding.bottom);
gfx.drawLine((int) CROSS_ICON_SIZE.getWidth() - crossIconPadding.right, 0 + crossIconPadding.top, 0 + crossIconPadding.left, (int) CROSS_ICON_SIZE.getHeight() - crossIconPadding.bottom);
} else {
gfx.setColor(Color.BLACK);
gfx.drawLine(0 + crossIconPadding.left, 0 + crossIconPadding.top, (int) CROSS_ICON_SIZE.getWidth() - crossIconPadding.right, (int) CROSS_ICON_SIZE.getHeight() - crossIconPadding.bottom);
gfx.drawLine((int) CROSS_ICON_SIZE.getWidth() - crossIconPadding.right, 0 + crossIconPadding.top, 0 + crossIconPadding.left, (int) CROSS_ICON_SIZE.getHeight() - crossIconPadding.bottom);
}
gfx.dispose();
}
}
public class TabComponent extends JPanel {
private CloseIcon closeIcon;
public TabComponent(String title) {
setLayout(new GridBagLayout());
setOpaque(false);
JLabel lblTitle = new JLabel(title);
closeIcon = new CloseIcon();
closeIcon.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
fireTabEvent(new TabEvent(this));//, TabEvent.TAB_CLOSING));
}
});
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 1;
gbc.anchor = GridBagConstraints.WEST;
add(lblTitle, gbc);
gbc.gridx++;
gbc.weightx = 0;
gbc.anchor = GridBagConstraints.NORTHEAST;
add(closeIcon);
}
public void addTabEventListener(TabEventListener listener) {
listenerList.add(TabEventListener.class, listener);
}
public void removeTabEventListener(TabEventListener listener) {
listenerList.remove(TabEventListener.class, listener);
}
protected void fireTabEvent(TabEvent evt) {
Object[] listeners = listenerList.getListeners(TabEventListener.class);
for (int i = 0, n = listeners.length; i < n; i++) {
((TabEventListener) listeners[i]).handleEvent(evt);
}
}
}
}
关于java - 如何以通用方式将鼠标事件传播到父容器,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31507126/
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我已经有一段时间没有写js了,显然有点生疏了。试图理解以下问题。 getCurrentPosition successCallback 中的警报正确显示纬度,但最后一行警报未定义。为什么我的 clie
请帮助我,我从来没有用 xib 为 iPhone/iPad 制作过通用的 UIViewControllers。如何使用 .m 和 .h 文件以及 _iphone.xib 和 _ipad.xib 创建类
我正在尝试创建一个 createRequest 函数,我可以将其重新用于我的所有网络调用,有些需要发布 JSON 而其他则不需要,所以我正在考虑创建一个采用可选通用对象的函数;理论上是这样的: str
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