DragTabFrame关闭不一致 [英] DragTabFrame closing inconsistently
本文介绍了DragTabFrame关闭不一致的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
下面的代码应该与您在FF，IE或Chrome等浏览器中看到的多文档界面（MDI）有点相似。它在选项卡式窗格中显示文档（黑色缓冲图像作为间隔符），以便用户可以将它们从窗格拖动到新（或现有）窗口中。
The code below is supposed to work a little like the Multi-Document Interface (MDI) you might see in a browser like FF, IE or Chrome. It presents 'documents' (a black buffered image as spacer) in a tabbed pane such that they can be dragged from the pane into a new (or existing) window by user choice.
但是，一旦它们没有更多选项卡，它就会关闭帧，以及在没有更多可见窗口时关闭JVM。我想我通过在 DragTabManager 中使用计时器进行检查来修复它们：
But it has had issues with closing frames once they have no more tabs, as well as closing the JVM when there are no further visible windows. I think I fixed them by checking with a Timer in the DragTabManager:
- 它检查
DragTabFrame - 如果找不到可见的框架实例，则结束
计时器允许JRE退出。
- It checks open frames for instances of
DragTabFrame - If it finds one, it check the tab count. If 0 the frame is set invisible and disposed.
- If it finds no instances of the frame that are visible, it ends the
Timerto allow the JRE to exit.
至少这是应该如何工作的。它似乎在这里可靠地工作，并且我看到没有'空框架或VM无法关闭'进行了不少测试。它是否像其他人一样宣传，还是我需要进一步观察？
At least that is how it is supposed to work. It seems to be working reliably here, and I have seen no 'empty frame or VM failing to shut down' for quite a few tests. Does it work as advertised for others, or do I need to look further?
import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
public class DragTabFrame extends JFrame {
private JTabbedPane tabbedPane = new JTabbedPane();
private final static DragTabManager dragTabManager = new DragTabManager();
final MouseAdapter ma = new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
JComponent c = (JComponent) e.getSource();
dragTabManager.setCurrentComponent(c);
DragTabFrame dtf = (DragTabFrame)c.getTopLevelAncestor();
dragTabManager.setCurrentFrame(dtf);
JTabbedPane tp = dtf.getTabbedPane();
int index = tp.indexOfComponent(c);
if (index<0) index = 0;
String title = tp.getTitleAt(index);
dragTabManager.setCurrentTitle(title);
}
@Override
public void mousePressed(MouseEvent e) {
JComponent c = (JComponent) e.getSource();
DragTabFrame dtf = (DragTabFrame)c.getTopLevelAncestor();
dragTabManager.setCurrentComponent(c);
dragTabManager.setCurrentFrame(dtf);
JTabbedPane tp = dtf.getTabbedPane();
int index = tp.indexOfComponent(c);
if (index<0) index = 0;
String title = tp.getTitleAt(index);
dragTabManager.setCurrentTitle(title);
}
@Override
public void mouseReleased(MouseEvent e) {
JComponent c = (JComponent) e.getSource();
if (c.getTopLevelAncestor().getBounds().contains(e.getLocationOnScreen())) {
// do nothing, the drop point is the same frame
} else {
DragTabFrame dtf = getTargetFrame(e.getLocationOnScreen());
if (dtf == null) {
dtf = new DragTabFrame();
dtf.init();
dtf.setLocation(e.getLocationOnScreen());
} else {
DragTabFrame fromFrame = dragTabManager.getCurrentFrame();
fromFrame.removeTabComponent(c);
JTabbedPane tp = fromFrame.getTabbedPane();
if (tp.getTabCount() == 0) {
fromFrame.setVisible(false);
fromFrame.dispose();
}
}
dtf.addTabComponent(dragTabManager.getCurrentTitle(), c);
dtf.pack();
dtf.setVisible(true);
}
}
};
public JTabbedPane getTabbedPane() {
return tabbedPane;
}
public DragTabFrame getTargetFrame(Point p) {
Frame[] frames = Frame.getFrames();
for (Frame frame : frames) {
if (frame instanceof DragTabFrame
&& frame.getBounds().contains(p)) {
return (DragTabFrame) frame;
}
}
return null;
}
public void init() {
// the GUI as seen by the user (without frame)
JPanel gui = new JPanel(new BorderLayout());
gui.setBorder(new EmptyBorder(2, 3, 2, 3));
gui.add(tabbedPane, BorderLayout.CENTER);
add(gui);
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
// See https://stackoverflow.com/a/7143398/418556 for demo.
setLocationByPlatform(true);
}
public void addTabComponent(String name, Component c) {
tabbedPane.addTab(name, c);
c.addMouseListener(ma);
c.addMouseMotionListener(ma);
}
public void removeTabComponent(Component c) {
tabbedPane.remove(c);
c.removeMouseListener(ma);
c.removeMouseMotionListener(ma);
}
public static void main(String[] args) {
Runnable r = new Runnable() {
@Override
public void run() {
DragTabFrame dtf = new DragTabFrame();
dtf.init();
BufferedImage bi = new BufferedImage(
200, 40, BufferedImage.TYPE_INT_RGB);
for (int ii = 1; ii < 4; ii++) {
JLabel l = new JLabel(new ImageIcon(bi));
dtf.addTabComponent("Tab " + ii, l);
}
dtf.pack();
// should be done last, to avoid flickering, moving,
// resizing artifacts.
dtf.setVisible(true);
}
};
// Swing GUIs should be created and updated on the EDT
// http://docs.oracle.com/javase/tutorial/uiswing/concurrency/initial.html
SwingUtilities.invokeLater(r);
}
}
class DragTabManager {
private DragTabFrame currentFrame;
private JComponent currentComponent;
private String currentTitle;
private Timer timer;
public DragTabManager() {
ActionListener actionListener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Frame[] frames = Frame.getFrames();
if (frames.length==0) {
timer.stop();
}
System.out.println("frames.length: " + frames.length);
boolean allInvisible = true;
for (Frame frame : frames) {
if (frame instanceof DragTabFrame) {
DragTabFrame dtf = (DragTabFrame)frame;
if (dtf.isVisible()) {
allInvisible = false;
}
if (dtf.getTabbedPane().getTabCount()==0) {
dtf.setVisible(false);
dtf.dispose();
}
}
}
if (allInvisible) {
timer.stop();
}
}
};
timer = new Timer(200,actionListener);
timer.start();
}
/**
* @return the currentFrame
*/
public DragTabFrame getCurrentFrame() {
return currentFrame;
}
/**
* @param currentFrame the currentFrame to set
*/
public void setCurrentFrame(DragTabFrame currentFrame) {
this.currentFrame = currentFrame;
}
/**
* @return the currentComponent
*/
public JComponent getCurrentComponent() {
return currentComponent;
}
/**
* @param currentComponent the currentComponent to set
*/
public void setCurrentComponent(JComponent currentComponent) {
this.currentComponent = currentComponent;
}
/**
* @return the currentTitle
*/
public String getCurrentTitle() {
return currentTitle;
}
/**
* @param currentTitle the currentTitle to set
*/
public void setCurrentTitle(String currentTitle) {
this.currentTitle = currentTitle;
}
}
修复
根据 DSquare的答案中的建议，这里是固定来源，还有一些其他调整还有。
Fix
As per the suggestions in the answer of DSquare, here is the fixed source, with a few other tweaks as well.
import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
public class DragTabFrame extends JFrame {
private JTabbedPane tabbedPane = new JTabbedPane();
private final static DragTabManager dragTabManager = new DragTabManager();
final MouseAdapter ma = new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
JComponent c = (JComponent) e.getSource();
DragTabFrame dtf = (DragTabFrame) c.getTopLevelAncestor();
dragTabManager.setCurrentComponent(c);
dragTabManager.setCurrentFrame(dtf);
JTabbedPane tp = dtf.getTabbedPane();
int index = tp.indexOfComponent(c);
String title = tp.getTitleAt(index);
dragTabManager.setCurrentTitle(title);
}
@Override
public void mouseReleased(MouseEvent e) {
JComponent c = (JComponent) e.getSource();
if (c.getTopLevelAncestor().getBounds().contains(
e.getLocationOnScreen())) {
// do nothing, the drop point is the same frame
} else {
DragTabFrame dtf = getTargetFrame(e.getLocationOnScreen());
if (dtf == null) {
dtf = new DragTabFrame();
dtf.init();
dtf.setLocation(e.getLocationOnScreen());
}
DragTabFrame fromFrame = dragTabManager.getCurrentFrame();
fromFrame.removeTabComponent(c);
JTabbedPane tp = fromFrame.getTabbedPane();
if (tp.getTabCount() == 0) {
fromFrame.setVisible(false);
fromFrame.dispose();
}
dtf.addTabComponent(dragTabManager.getCurrentTitle(), c);
dtf.pack();
dtf.setVisible(true);
}
}
};
public JTabbedPane getTabbedPane() {
return tabbedPane;
}
public DragTabFrame getTargetFrame(Point p) {
Frame[] frames = Frame.getFrames();
for (Frame frame : frames) {
if (frame instanceof DragTabFrame
&& frame.getBounds().contains(p)) {
return (DragTabFrame) frame;
}
}
return null;
}
public void init() {
// the GUI as seen by the user (without frame)
JPanel gui = new JPanel(new BorderLayout());
gui.setBorder(new EmptyBorder(2, 3, 2, 3));
gui.add(tabbedPane, BorderLayout.CENTER);
add(gui);
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
// See https://stackoverflow.com/a/7143398/418556 for demo.
setLocationByPlatform(true);
}
public void addTabComponent(String name, Component c) {
tabbedPane.addTab(name, c);
c.addMouseListener(ma);
c.addMouseMotionListener(ma);
}
public void removeTabComponent(Component c) {
tabbedPane.remove(c);
c.removeMouseListener(ma);
c.removeMouseMotionListener(ma);
}
public static void main(String[] args) {
Runnable r = new Runnable() {
@Override
public void run() {
DragTabFrame dtf = new DragTabFrame();
dtf.init();
BufferedImage bi = new BufferedImage(
200, 40, BufferedImage.TYPE_INT_RGB);
for (int ii = 1; ii < 4; ii++) {
JLabel l = new JLabel(new ImageIcon(bi));
dtf.addTabComponent("Tab " + ii, l);
}
dtf.pack();
dtf.setVisible(true);
}
};
SwingUtilities.invokeLater(r);
}
}
class DragTabManager {
private DragTabFrame currentFrame;
private JComponent currentComponent;
private String currentTitle;
/**
* @return the currentFrame
*/
public DragTabFrame getCurrentFrame() {
return currentFrame;
}
/**
* @param currentFrame the currentFrame to set
*/
public void setCurrentFrame(DragTabFrame currentFrame) {
this.currentFrame = currentFrame;
}
/**
* @return the currentComponent
*/
public JComponent getCurrentComponent() {
return currentComponent;
}
/**
* @param currentComponent the currentComponent to set
*/
public void setCurrentComponent(JComponent currentComponent) {
this.currentComponent = currentComponent;
}
/**
* @return the currentTitle
*/
public String getCurrentTitle() {
return currentTitle;
}
/**
* @param currentTitle the currentTitle to set
*/
public void setCurrentTitle(String currentTitle) {
this.currentTitle = currentTitle;
}
}
推荐答案
停用计时器，我找到的不一致是将最后一个标签拖动到一个新的（没有现有的）框架。这是因为一个糟糕的其他地方没有让负责检查和关闭原始Frame的代码运行。我已经像这样修改它并且它到目前为止没有计时器：
Deactivating the timer, the inconsistencies I found were when dragging the last tab into a new (no existing) frame. That was because of a bad placed else that didn't let the code responsible for checking and closing the original Frame to run. I've modified it like this and it works so far, without the timer:
@Override
public void mouseReleased(MouseEvent e) {
JComponent c = (JComponent) e.getSource();
if (c.getTopLevelAncestor().getBounds().contains(e.getLocationOnScreen())) {
// do nothing, the drop point is the same frame
} else {
DragTabFrame dtf = getTargetFrame(e.getLocationOnScreen());
if (dtf == null) {
dtf = new DragTabFrame();
dtf.init();
dtf.setLocation(e.getLocationOnScreen());
}// else {
DragTabFrame fromFrame = dragTabManager.getCurrentFrame();
fromFrame.removeTabComponent(c);
JTabbedPane tp = fromFrame.getTabbedPane();
if (tp.getTabCount() == 0) {
fromFrame.setVisible(false);
fromFrame.dispose();
}
//}
dtf.addTabComponent(dragTabManager.getCurrentTitle(), c);
dtf.pack();
dtf.setVisible(true);
}
}
[...]
public DragTabManager() {
/* unused actionlistener code here */
//timer = new Timer(200,actionListener);
//timer.start();
}
我不认为应该有任何其他问题，尽管我不喜欢知道你提到的关闭JVM问题。
I don't think there should be any other problems, though I don't know about that closing JVM problem you mentioned.
这篇关于DragTabFrame关闭不一致的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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