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java - 如何以通用方式将鼠标事件传播到父容器

转载 作者:塔克拉玛干 更新时间:2023-11-02 19:58:28 25 4
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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。

  • 当鼠标悬停在“关闭”图标上时,只希望鼠标事件触发“关闭”事件
  • 所有其他时候,您需要选项卡的默认行为

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 JLabelCloseIconJPanel。该组件监听 ActionEventsCloseIcon,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);
}
}

}

可运行的例子...

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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