java-ExpandBar无法与GridLayout一起使用
作者:互联网
我正在用Java和SWT创建应用程序,但是我遇到了问题.我想将ExpandBar放入GridLayout.当我不折叠扩展栏时,一切都很好.当我这样做时,它可以正常折叠,但是不会重新布局复合材料.以下屏幕应解释我的问题:
崩溃前:
崩溃后:
我尝试了一些技巧,例如:
bar.addExpandListener(new ExpandListener() {
public void itemExpanded(ExpandEvent e) {
item0.setHeight(composite.computeSize(SWT.DEFAULT, SWT.DEFAULT).y);
gridData2.heightHint = composite.computeSize(SWT.DEFAULT,
SWT.DEFAULT).y;
comp.layout(true, true);
}
public void itemCollapsed(ExpandEvent e) {
item0.setHeight(item0.getHeaderHeight());
gridData2.heightHint = item0.getHeaderHeight();
comp.layout(true, true);
}
});
完全不起作用.这是SSCCE:
package stackoverflow;
import org.eclipse.jface.window.Window;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.ExpandBar;
import org.eclipse.swt.widgets.ExpandItem;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
public class MainWindowSWT extends Window {
public MainWindowSWT() {
super((Shell)null);
setBlockOnOpen(true);
open();
Display.getCurrent().dispose();
}
@Override
protected Control createContents(Composite parent) {
final Composite comp = new Composite(getShell(), 0);
GridLayout layout = new GridLayout(1, true);
comp.setLayout(layout);
Tree tree = new Tree(comp, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
GridData gridData = new GridData();
gridData.verticalAlignment = GridData.FILL;
gridData.verticalSpan = 2;
gridData.grabExcessVerticalSpace = true;
gridData.horizontalAlignment = GridData.FILL;
gridData.grabExcessHorizontalSpace = true;
tree.setLayoutData(gridData);
final ExpandBar bar = new ExpandBar(comp, SWT.V_SCROLL);
final Composite composite = new Composite(bar, SWT.NONE);
GridLayout gridLayout = new GridLayout();
gridLayout.verticalSpacing = 10;
composite.setLayout(gridLayout);
Button button = new Button(composite, SWT.PUSH);
button.setText("SWT.PUSH");
final ExpandItem item0 = new ExpandItem(bar, SWT.NONE, 0);
item0.setText("Test");
item0.setHeight(composite.computeSize(SWT.DEFAULT, SWT.DEFAULT).y);
item0.setControl(composite);
item0.setExpanded(true);
final GridData gridData2 = new GridData();
gridData2.horizontalAlignment = GridData.FILL;
gridData2.grabExcessHorizontalSpace = true;
bar.setLayoutData(gridData2);
return parent;
}
}
Ubuntu 12.04.1 amd64,SWT 3.7.2.
提前致谢.
//顺便说一句:我不想调整shell的大小.我想调整扩展栏上方的树的大小.
解决方法:
好的,所以我找到了一个有点棘手的解决方案,但是它可行:
public class MainWindowSWT {
public static void main(String[] args) {
final Display display = new Display();
final Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
shell.setText("ExpandBar Example");
final ExpandBar bar = new ExpandBar(shell, SWT.NONE);
final Composite composite = new Composite(bar, SWT.NONE);
GridLayout layout = new GridLayout();
composite.setLayout(layout);
Button button = new Button(composite, SWT.PUSH);
button.setText("SWT.PUSH");
ExpandItem item0 = new ExpandItem(bar, SWT.NONE, 0);
item0.setText("What is your favorite button");
item0.setHeight(composite.computeSize(SWT.DEFAULT, SWT.DEFAULT).y);
item0.setControl(composite);
item0.setExpanded(true);
bar.setSpacing(8);
bar.addExpandListener(new ExpandListener() {
@Override
public void itemExpanded(ExpandEvent e) {
if (e.item instanceof ExpandItem) {
ExpandItem item = (ExpandItem) e.item;
shell.setSize(shell.getSize().x, shell.getSize().y + item.getHeight());
}
}
@Override
public void itemCollapsed(ExpandEvent e) {
if (e.item instanceof ExpandItem) {
ExpandItem item = (ExpandItem) e.item;
shell.setSize(shell.getSize().x, shell.getSize().y - item.getHeight());
}
}
});
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}
基本上,您可以强制外壳增大/减小其高度以反映更改.我希望有一种更简单/更漂亮的方法,但是目前我什么都没想到.
它部分基于this答案,但不使用线程.
标签:grid-layout,swt,ubuntu-12-04,layout-manager,java 来源: https://codeday.me/bug/20191127/2076073.html