Java 在SWT中,什么';在父shell和非对话子shell之间进行通信的最佳方式是什么?
我有一个用SWT编写的大型现有应用程序需要修改 GUI包含shell打开非对话框子shell 现在我必须在关闭子shell时更新父shell的信息 我设想了两种选择:Java 在SWT中,什么';在父shell和非对话子shell之间进行通信的最佳方式是什么?,java,shell,swt,communication,Java,Shell,Swt,Communication,我有一个用SWT编写的大型现有应用程序需要修改 GUI包含shell打开非对话框子shell 现在我必须在关闭子shell时更新父shell的信息 我设想了两种选择: 将所有子对象转换为扩展对话框类。问题是它需要大量的重构 传递父逻辑类的引用,以便在关闭子逻辑类之前,我可以调用父逻辑类的方法。我不喜欢这个设计 如果在父代码中我可以监听子shell事件并根据子shell上发生的情况采取行动,那就太好了。这是一种可观察的模式。我在“SWT:开发人员笔记本”中读到: 子shell不需要任何事件循环。为
谢谢。我建议您在子shell上使用
ShellListener
。然后可以重写shellClosed
方法
示例
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.ShellEvent;
import org.eclipse.swt.events.ShellListener;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class Test {
private static Text text;
public static void main (String [] args)
{
Display display = new Display ();
final Shell shell = new Shell (display);
shell.setLayout(new GridLayout());
shell.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
shell.setSize(200, 100);
shell.setText("Parent Shell");
Label label = new Label(shell, SWT.NONE);
label.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
label.setText("The text from child shell ...");
text = new Text(shell, SWT.BORDER);
text.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
Button openChild = new Button(shell, SWT.PUSH);
openChild.setText("Open Child ...");
openChild.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
openChild(shell);
}
});
shell.open ();
while (!shell.isDisposed ()) {
if (!display.readAndDispatch ()) display.sleep ();
}
display.dispose ();
}
private static void openChild(Shell parent)
{
final Shell dialog = new Shell (parent, SWT.DIALOG_TRIM);
dialog.setLayout(new GridLayout());
dialog.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
dialog.setSize(200, 100);
dialog.setText("Child Shell");
Label childLabel = new Label(dialog, SWT.NONE);
childLabel.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
childLabel.setText("Type something here ...");
final Text childText = new Text(dialog, SWT.BORDER);
childText.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
Button okButton = new Button (dialog, SWT.PUSH);
okButton.setText ("&OK");
okButton.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
dialog.close();
}
});
dialog.addShellListener(new ShellListener() {
public void shellIconified(ShellEvent e) {
}
public void shellDeiconified(ShellEvent e) {
}
public void shellDeactivated(ShellEvent e) {
}
public void shellClosed(ShellEvent e) {
if(text != null && !text.isDisposed())
text.setText(childText.getText());
}
public void shellActivated(ShellEvent e) {
}
});
dialog.setDefaultButton (okButton);
dialog.open ();
}
}
注意
您还可以使用
DisposeListener
,但在这种情况下,您不能使用text.setText(childText.getText())代码>(参见上面的示例)。要处理此问题,请将文本保存在字符串变量中,然后使用字符串变量填充父文本框。我建议您在子shell上使用ShellListener
。然后可以重写shellClosed
方法
示例
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.ShellEvent;
import org.eclipse.swt.events.ShellListener;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class Test {
private static Text text;
public static void main (String [] args)
{
Display display = new Display ();
final Shell shell = new Shell (display);
shell.setLayout(new GridLayout());
shell.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
shell.setSize(200, 100);
shell.setText("Parent Shell");
Label label = new Label(shell, SWT.NONE);
label.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
label.setText("The text from child shell ...");
text = new Text(shell, SWT.BORDER);
text.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
Button openChild = new Button(shell, SWT.PUSH);
openChild.setText("Open Child ...");
openChild.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
openChild(shell);
}
});
shell.open ();
while (!shell.isDisposed ()) {
if (!display.readAndDispatch ()) display.sleep ();
}
display.dispose ();
}
private static void openChild(Shell parent)
{
final Shell dialog = new Shell (parent, SWT.DIALOG_TRIM);
dialog.setLayout(new GridLayout());
dialog.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
dialog.setSize(200, 100);
dialog.setText("Child Shell");
Label childLabel = new Label(dialog, SWT.NONE);
childLabel.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
childLabel.setText("Type something here ...");
final Text childText = new Text(dialog, SWT.BORDER);
childText.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
Button okButton = new Button (dialog, SWT.PUSH);
okButton.setText ("&OK");
okButton.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
dialog.close();
}
});
dialog.addShellListener(new ShellListener() {
public void shellIconified(ShellEvent e) {
}
public void shellDeiconified(ShellEvent e) {
}
public void shellDeactivated(ShellEvent e) {
}
public void shellClosed(ShellEvent e) {
if(text != null && !text.isDisposed())
text.setText(childText.getText());
}
public void shellActivated(ShellEvent e) {
}
});
dialog.setDefaultButton (okButton);
dialog.open ();
}
}
注意
您还可以使用DisposeListener
,但在这种情况下,您不能使用text.setText(childText.getText())代码>(参见上面的示例)。要处理此问题,请将文本保存在字符串变量中,然后使用字符串变量填充父文本框。谢谢,它的效果非常好。事实上,我需要一个处置者。感谢您的回复,我在SWT方面迈出了一大步。谢谢,它的工作方式很有魅力。事实上,我需要一个处置者。感谢你的回应,我在SWT上迈出了一大步。