java SWT/JFace：删除小部件
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SWT/JFace: remove widgets
提问by Thilo
Group group = new Group(parent, SWT.NONE);
StyledText comment = new StyledText(group, SWT.BORDER_DASH);
This creates a group with a text area inside.
这将创建一个内部带有文本区域的组。
How can I later delete the text (remove it from the screen so that I can replace it with something else)?
我以后如何删除文本（从屏幕上删除它以便我可以用其他东西替换它）？
采纳答案by McDowell
Use Widget.dispose.
使用 Widget.dispose。
public class DisposeDemo {
private static void addControls(final Shell shell) {
shell.setLayout(new GridLayout());
Button button = new Button(shell, SWT.PUSH);
button.setText("Click to remove all controls from shell");
button.addSelectionListener(new SelectionListener() {
@Override public void widgetDefaultSelected(SelectionEvent event) {}
@Override public void widgetSelected(SelectionEvent event) {
for (Control kid : shell.getChildren()) {
kid.dispose();
}
}
});
for (int i = 0; i < 5; i++) {
Label label = new Label(shell, SWT.NONE);
label.setText("Hello, World!");
}
shell.pack();
}
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
addControls(shell);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}
回答by James Van Huis
Another option is to use a StackLayoutto switch between underlying controls. This prevents you from running into a "widget is disposed" error.
另一种选择是使用StackLayout在底层控件之间切换。这可以防止您遇到“小部件已处理”错误。
回答by daanish.rumani
You have to either call comment.changeParent(newParent)or comment.setVisible(false)to remove/hide it from the Group. I am unsure if comment.changeParent(null)would work but I would give that a try.
您必须呼叫comment.changeParent(newParent)或comment.setVisible(false)从组中删除/隐藏它。我不确定是否comment.changeParent(null)可行，但我会尝试一下。
We do it this way because SWT uses the Composite Pattern.
我们这样做是因为 SWT 使用复合模式。
回答by ACV
group.getChildren()[0].dispose()will remove the first child. You need to find a way to identify the precise child you want to delete. It could be comparing the id. You can do that by using the setData / getData on that control:
group.getChildren()[0].dispose()将删除第一个孩子。您需要找到一种方法来确定要删除的确切子项。它可能是比较 id。您可以通过在该控件上使用 setData / getData 来做到这一点：
For example:
例如：
StyledText comment = new StyledText(group, SWT.BORDER_DASH);
comment.setData("ID","commentEditBox");
and then:
接着：
for (Control ctrl : group.getChildren()) {
if (control.getData("ID").equals("commentEditBox")) {
ctrl.dispose();
break;
}
}
