本文介绍了把焦点放在不是专注窗口的小孩的面板上？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
我正在使用Java来创建一个内部工具。这两个包含两个 JPanels ，它们可以在两个独立的屏幕上运行。我希望能够点击 JButton 这是 JFrame A 的一部分，它将发送一个键盘动作到 JFrame B 。不幸的是我似乎无法做到这一点，因为 JFrame B 没有焦点，我可以'由于 JFrame B 不是的子项，所以请使用 Focus 方法中的任何一个。 Window （ JFrame A is）。
那么我怎样才能给 JFrame B 焦点，尽管它不是焦点窗口的子项或发送键盘事件它会回应而没有焦点吗？
解决方案
很难管理两个将，创建一个/两个并通过删除所有JComponents来重复使用
基本上是这样的：
$ p $ EventBueue.invokeLater（new Runnable（）{
@Override
public void run（）{
someComponent.grabFocus（）;
someComponent.requestFocus（）; //或inWindow取决于Swing或Awt
}
}）;
但是两个JFrame之间的东西有点复杂，只是基本的和未完成的例子.good.sun.forums.com）
import java.awt。*;
import java.awt.event。*;
import javax.swing。*;
public class PMDialog extends JDialog {
private static final long serialVersionUID = 1L;
private boolean modal = false;
private WindowAdapter parentWindowListener;
私人窗口所有者;
private JFrame blockedFrame = new JFrame（Blocked Frame）;
private JFrame noBlockedFrame = new JFrame（No Blocked Frame）;
public PMDialog（）{
noBlockedFrame.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）;
noBlockedFrame.getContentPane（）。add（new JButton（new TestAction（Test button））{
private static final long serialVersionUID = 1L;
@Override
public void actionPerformed（ActionEvent evt）{
System.out.println（Non blocked button push）;
/ * if（blockedFrame.isVisible（））{
noBlockedFrame .setVisible（false）;
} else {
blockedFrame.setVisible（true）;
} * /
noBlockedFrame.setVisible（true）;
blockedFrame.setVisible true）;
}
}））;
noBlockedFrame.setSize（200，200）;
noBlockedFrame.setVisible（true）;
blockedFrame.setDefaultCloseOperation（JFrame.HIDE_ON_CLOSE）;
blockedFrame.getContentPane（）。add（new JButton（new TestAction（Test Button）{
private static final long serialVersionUID = 1L;
@Override
public void actionPerformed（ActionEvent evt）{
final PMDialog pmd = new PMDialog（blockedFrame，Partial Modal Dialog，true）;
pmd.setSize（200，100）; $ b $添加新的JButton（新的AbstractAction（测试按钮）{
private static final long serialVersionUID = 1L;
$ b $
$ @Override
public void actionPerformed（ActionEvent evt）{
System.out.println（Blocked button push）;
pmd.setVisible（false）;
blockedFrame.setVisible（false）;
noBlockedFrame.setVisible（t后悔）;
}
}））;
pmd.setDefaultCloseOperation（PMDialog.DISPOSE_ON_CLOSE）;
pmd.setVisible（true）;
System.out.println（从对话框返回）;
}
}））;
blockedFrame.setSize（200，200）;
blockedFrame.setLocation（300，0）;
blockedFrame.setVisible（false）;
$ b $ public PMDialog（JDialog parent，String title，boolean isModal）{
super（parent，title，false）;
initDialog（parent，title，isModal）;
$ b $ public PMDialog（JFrame parent，String title，boolean isModal）{
super（parent，title，false）;
initDialog（parent，title，isModal）;
private void initDialog（Window parent，String title，boolean isModal）{
owner = parent;
modal = isModal;
parentWindowListener = new WindowAdapter（）{
@Override $ b $ public void windowActivated（WindowEvent e）{
if（isVisible（））{
System。通过out.println（ Dialog.getFocusBack（））;
getFocusBack（）;
}
}
};
$ b $ private void getFocusBack（）{
Toolkit.getDefaultToolkit（）。beep（）;
super.setVisible（false）;
super.pack（）;
super.setLocationRelativeTo（owner）;
super.setVisible（true）;
super.toFront（）;
@Override
public void dispose（）{
owner.setEnabled（true）;
owner.setFocusableWindowState（true）;
super.dispose（）;
$ b @Override
@SuppressWarnings（deprecation）
public void hide（）{
owner.setEnabled（true）;
owner.setFocusableWindowState（true）;
super.hide（）;
@Override
public void setVisible（boolean visible）{
boolean blockParent =（visible&& modal）;
owner.setEnabled（！blockParent）;
owner.setFocusableWindowState（！blockParent）;
super.setVisible（visible）;
if（blockParent）{
System.out.println（Adding listener to parent ...）;
owner.addWindowListener（parentWindowListener）;
尝试{
if（SwingUtilities.isEventDispatchThread（））{
System.out.println（EventDispatchThread）;
EventQueue theQueue = getToolkit（）。getSystemEventQueue（）; $（b）b（isVisible（））{
AWTEvent event = theQueue.getNextEvent（）;
Object src = event.getSource（）;
if（eventEvent eventEvent）{
（（ActiveEvent）event）.dispatch（）;
} else if（src instanceof Component）{
（（Component）src）.dispatchEvent（event）;
} else {
System.out.println（OUTSIDE EventDispatchThread）;
synchronized（getTreeLock（））{
while（isVisible（））{
try {
getTreeLock（）。wait（）;
} catch（InterruptedException e）{
break;
} catch（Exception ex）{
ex.printStackTrace（）;
System.out.println（Error from EDT ...：+ ex）;
} else {
System.out.println（从父级删除侦听器...）;
owner.removeWindowListener（parentWindowListener）;
owner.setEnabled（true）;
owner.setFocusableWindowState（true）;
}
}
@Override
public void setModal（boolean modal）{
this.modal = modal;
public static void main（String args []）{
PMDialog pMDialog = new PMDialog（）;
$ b编辑：如何将焦点添加到 JDialog 是否有优秀的Woodoo由camickr ，但是 AncestorListener 不是我的一杯Java，也不是我的抽象I'm working in Java to create an internal tool. The two consists of two JPanels which are anticipated to run on two separate screens. I want to be able to click a JButton which is part of JFrame A which will send a keyboard action to JFrame B.
Unfortunately I can't seem to do this because JFrame B doesn't have the focus and I can't use any of the request Focus methods because JFrame B is not a child of the Focus Window (JFrame A is).
So how can I either give JFrame B focus despite it not being a child of the Focus Window or send Keyboard Events to JFrame B that it will respond to without having focus?
解决方案is so hard to manage Focus between two JFrames, better would be create only one JFrame and other Top-level Containers would be JDialogs, create one/two JDialog(s) and reuse that by removing all JComponents
basicaly it would be :
EventQueue.invokeLater(new Runnable() { @Override public void run() { someComponent.grabFocus(); someComponent.requestFocus();//or inWindow depends if Swing or Awt } });but between two JFrames is things little bit complicated, just basic and uncompleted example (based on code from old.good.sun.forums.com)
import java.awt.*; import java.awt.event.*; import javax.swing.*; public class PMDialog extends JDialog { private static final long serialVersionUID = 1L; private boolean modal = false; private WindowAdapter parentWindowListener; private Window owner; private JFrame blockedFrame = new JFrame("Blocked Frame"); private JFrame noBlockedFrame = new JFrame("No Blocked Frame"); public PMDialog() { noBlockedFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); noBlockedFrame.getContentPane().add(new JButton(new AbstractAction("Test button") { private static final long serialVersionUID = 1L; @Override public void actionPerformed(ActionEvent evt) { System.out.println("Non blocked button pushed"); /*if (blockedFrame.isVisible()) { noBlockedFrame.setVisible(false); } else { blockedFrame.setVisible(true); }*/ noBlockedFrame.setVisible(true); blockedFrame.setVisible(true); } })); noBlockedFrame.setSize(200, 200); noBlockedFrame.setVisible(true); blockedFrame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE); blockedFrame.getContentPane().add(new JButton(new AbstractAction("Test Button") { private static final long serialVersionUID = 1L; @Override public void actionPerformed(ActionEvent evt) { final PMDialog pmd = new PMDialog(blockedFrame, "Partial Modal Dialog", true); pmd.setSize(200, 100); pmd.setLocationRelativeTo(blockedFrame); pmd.getContentPane().add(new JButton(new AbstractAction("Test button") { private static final long serialVersionUID = 1L; @Override public void actionPerformed(ActionEvent evt) { System.out.println("Blocked button pushed"); pmd.setVisible(false); blockedFrame.setVisible(false); noBlockedFrame.setVisible(true); } })); pmd.setDefaultCloseOperation(PMDialog.DISPOSE_ON_CLOSE); pmd.setVisible(true); System.out.println("Returned from Dialog"); } })); blockedFrame.setSize(200, 200); blockedFrame.setLocation(300, 0); blockedFrame.setVisible(false); } public PMDialog(JDialog parent, String title, boolean isModal) { super(parent, title, false); initDialog(parent, title, isModal); } public PMDialog(JFrame parent, String title, boolean isModal) { super(parent, title, false); initDialog(parent, title, isModal); } private void initDialog(Window parent, String title, boolean isModal) { owner = parent; modal = isModal; parentWindowListener = new WindowAdapter() { @Override public void windowActivated(WindowEvent e) { if (isVisible()) { System.out.println("Dialog.getFocusBack()"); getFocusBack(); } } }; } private void getFocusBack() { Toolkit.getDefaultToolkit().beep(); super.setVisible(false); super.pack(); super.setLocationRelativeTo(owner); super.setVisible(true); super.toFront(); } @Override public void dispose() { owner.setEnabled(true); owner.setFocusableWindowState(true); super.dispose(); } @Override @SuppressWarnings("deprecation") public void hide() { owner.setEnabled(true); owner.setFocusableWindowState(true); super.hide(); } @Override public void setVisible(boolean visible) { boolean blockParent = (visible && modal); owner.setEnabled(!blockParent); owner.setFocusableWindowState(!blockParent); super.setVisible(visible); if (blockParent) { System.out.println("Adding listener to parent ..."); owner.addWindowListener(parentWindowListener); try { if (SwingUtilities.isEventDispatchThread()) { System.out.println("EventDispatchThread"); EventQueue theQueue = getToolkit().getSystemEventQueue(); while (isVisible()) { AWTEvent event = theQueue.getNextEvent(); Object src = event.getSource(); if (event instanceof ActiveEvent) { ((ActiveEvent) event).dispatch(); } else if (src instanceof Component) { ((Component) src).dispatchEvent(event); } } } else { System.out.println("OUTSIDE EventDispatchThread"); synchronized (getTreeLock()) { while (isVisible()) { try { getTreeLock().wait(); } catch (InterruptedException e) { break; } } } } } catch (Exception ex) { ex.printStackTrace(); System.out.println("Error from EDT ... : " + ex); } } else { System.out.println("Removing listener from parent ..."); owner.removeWindowListener(parentWindowListener); owner.setEnabled(true); owner.setFocusableWindowState(true); } } @Override public void setModal(boolean modal) { this.modal = modal; } public static void main(String args[]) { PMDialog pMDialog = new PMDialog(); } }EDIT: for How to adds Focus to the JDialog is there excelent Woodoo by camickr Dialog Focus but AncestorListener isn't my cup of Java and too much abstract for me
这篇关于把焦点放在不是专注窗口的小孩的面板上？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！