英文:
Why Selection event not triggered when selection is done using keyboard?
问题
我有这个使用SWT的Eclipse RCP应用程序。以下是示范代码：
Combo combo = new Combo(shell, SWT.NONE);
combo.setItems(items); // items是一个String[]
combo.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
combo.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetDefaultSelected(SelectionEvent e) {
System.out.println("在widgetDefaultSelected中");
}
@Override
public void widgetSelected(SelectionEvent e) {
System.out.println("在widgetSelected中");
}
});
这段代码中，Combo 已经在代码中进行了自动完成的设置。选择事件应该在鼠标或键盘事件触发时被触发。使用鼠标进行选择会触发选择事件，但使用键盘进行选择则不会。我正在尝试找出原因。
我的Eclipse版本不是最新的，是3.6.2版本，并附带了相应的SWT JAR文件。如果有任何帮助，我将不胜感激。
英文:
I have this Eclipse RCP application which uses SWT. Here is a sample code.
Combo combo = new Combo(shell, SWT.NONE);
combo.setItems(items); // items is a String[]
combo.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
combo.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetDefaultSelected(SelectionEvent e) {
System.out.println("In widgetDefaultSelected");
}
@Override
public void widgetSelected(SelectionEvent e) {
System.out.println("In widgetSelected");
}
});
The combo has been set up in the code for auto complete. The selection event is supposed to get triggered for mouse or keyboard events. A selection using mouse triggers the selection event but one with keyboard does not. I am trying to see why.
My eclipse is not the latest, it is version is 3.6.2 and the swt JARs that come with it. I would appreciate any help.
答案1
得分: 0
由于选择事件不会通过键盘触发，我在组合小部件上添加了一个键盘监听器，然后检查用户是否按下了回车键。
combo.addKeyListener(new KeyListener() {
@Override
public void keyPressed(KeyEvent e) {
}
@Override
public void keyReleased(KeyEvent e) {
if (e.keyCode==SWT.CR || e.keyCode==SWT.KEYPAD_CR) { // 回车键
Combo c = (Combo) e.getSource();
System.out.println(c.getText());
// 进行其余处理
}
}
});
看起来我可以从列表框中获取到所选的项目。到目前为止，似乎运行得还不错。
英文:
Since the selection event is not triggered with keyboard, I added a KeyListener to the combo widget and check to see if the user has pressed enter key.
combo.addKeyListener(new KeyListener() {
@Override
public void keyPressed(KeyEvent e) {
}
@Override
public void keyReleased(KeyEvent e) {
if (e.keyCode==SWT.CR || e.keyCode==SWT.KEYPAD_CR) { // Enter key
Combo c = (Combo) e.getSource();
System.out.println(c.getText());
// Do rest of processing
}
}
});
Seems like I am getting the selected item out of the list box. So far it seems to be working OK.
答案2
得分: 0
选择事件不用于键盘事件，Combo#addSelectionListener 的 Javadoc 在这里解释得很清楚：
<p>
-
当用户更改组合框的列表选择时，将调用<code>widgetSelected</code>。
-
通常在按下回车键时会调用<code>widgetDefaultSelected</code>，即组合框的文本区域。
</p>
英文:
Selection event is not used for keyboard events, the Javadoc of Combo#addSelectionListener is pretty clear here:
<p>
-
<code>widgetSelected</code> is called when the user changes the combo's list selection.
-
<code>widgetDefaultSelected</code> is typically called when ENTER is pressed the combo's text area.
</p>
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