我需要打开一个FileDialog,使用Java 7在Windows 7 Home上使用SWT打开一个文件。当按下BrowseBtn1按钮(SWT)时,我需要打开这个FileDialog。我正在使用addSelectionListener。这是正确的方法吗?如果是,为什么我的对话框在不满足任何运行时错误时将无法打开。我根本不使用AWT,只使用SWT。
import org.eclipse.swt.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.layout.*;
public class MySwtApp {
public static Display display;
public static Shell shell;
public static void main(String[] args) {
display = new Display ();
shell = new Shell (display);
shell.setText("MY TITLE");
GridLayout gridLayout = new GridLayout (3, false);
shell.setLayout (gridLayout);
Label Label1 = new Label (shell, SWT.NONE);
Label1.setText ("Select Message ");
GridData data = new GridData (200, SWT.DEFAULT);
Label1.setLayoutData (data);
Combo Combo1 = new Combo (shell, SWT.NONE);
Combo1.setItems (new String [] {"Option A",
"Option B"});
// CaseStudyCombo.setText ("CaseStudyCombo");
data = new GridData (200, SWT.DEFAULT);
Combo1.setLayoutData (data);
Combo1.addListener (SWT.DefaultSelection, new Listener () {
public void handleEvent (Event e) {
System.out.println (e.widget + " - Default Selection");
}
});
Label emptyLabel = new Label (shell, SWT.NONE);
emptyLabel.setText ("");
data = new GridData (50, SWT.DEFAULT);
emptyLabel.setLayoutData (data);
Label Label2 = new Label (shell, SWT.NONE);
Label2.setText ("Next Message: ");
data = new GridData (200, SWT.DEFAULT);
Label2.setLayoutData (data);
final Text text4 = new Text (shell, SWT.BORDER);
text4.setText ("");
data = new GridData (215, SWT.DEFAULT);
text4.setLayoutData (data);
Button BrowseBtn1 = new Button (shell, SWT.PUSH);
BrowseBtn1.setText ("Browse");
data = new GridData (80, SWT.DEFAULT);
BrowseBtn1.setLayoutData (data);
BrowseBtn1.addSelectionListener(new SelectionAdapter() {
String result = "";
public void WidgetSelected(SelectionEvent e) {
FileDialog dialog = new FileDialog (shell, SWT.OPEN);
dialog.setFilterExtensions(new String [] {"*.html"});
//dialog.setFilterPath("c:\\temp");
result = dialog.open();
text4.setText(result);
}
});
Label Label3 = new Label (shell, SWT.NONE);
Label3.setText ("Message Label 3: ");
data = new GridData (200, SWT.DEFAULT);
Label3.setLayoutData (data);
Text text5 = new Text (shell, SWT.BORDER);
text5.setText ("");
data = new GridData (215, SWT.DEFAULT);
text5.setLayoutData (data);
Button BrowseBtn2 = new Button (shell, SWT.PUSH);
BrowseBtn2.setText ("Browse");
data = new GridData (80, SWT.DEFAULT);
BrowseBtn2.setLayoutData (data);
Label Label4 = new Label (shell, SWT.NONE);
Label4.setText ("Message Label 4: ");
data = new GridData (200, SWT.DEFAULT);
Label4.setLayoutData (data);
Combo Combo2 = new Combo (shell, SWT.NONE);
Combo2.setText ("Options");
data = new GridData (200, SWT.DEFAULT);
Combo2.setLayoutData (data);
Button searchBtn1 = new Button (shell, SWT.PUSH);
searchBtn1.setText ("Search");
data = new GridData (80, SWT.DEFAULT);
searchBtn1.setLayoutData (data);
Combo Combo3 = new Combo (shell, SWT.NONE);
// CaseStudyCombo.setItems (new String [] {"Item 1", "Item 2", "Item 2"});
Combo3.setText ("Options:");
data = new GridData (200, SWT.DEFAULT);
Combo3.setLayoutData (data);
Combo Combo4 = new Combo (shell, SWT.NONE);
Combo4.setText ("Options:");
data = new GridData (200, SWT.DEFAULT);
Combo4.setLayoutData (data);
Button showDetailsBtn = new Button (shell, SWT.PUSH);
showDetailsBtn.setText ("Show Details");
data = new GridData (80, SWT.DEFAULT);
showDetailsBtn.setLayoutData (data);
shell.pack ();
shell.open ();
while (!shell.isDisposed ()) {
if (!display.readAndDispatch ())
display.sleep ();
}
display.dispose ();
}
}
请帮助解决此问题。
答案 0 :(得分:3)
有问题的一行是这样的:
public void WidgetSelected(SelectionEvent e)
注意大写的'W'。您目前正在做的是在该匿名类中定义一个新方法(而不是覆盖现有的widgetSelected(...)方法)。如果您将此更改为小写'w',则会起作用:
public void widgetSelected(SelectionEvent e)
使用@Override注释是一个很好的实践(实际上超过推荐)。如果您已经使用过,编译器会向您发送错误标记(请参阅例如Joshua Bloch Effective Java第2版第36项:始终使用覆盖注释)