如何在 SWT 中为一个选项卡项设置滚动复合

Question

我正在尝试以下代码为 TabItem "item2" 设置滚动复合。但无法获得滚动条。

在这里我创建了两个选项卡项，其中我需要仅为项目2设置滚动复合/滚动条，而不是为项目1设置滚动复合/滚动条

Display display = new Display();
final Shell shell = new Shell(display);
final TabFolder tabFolder = new TabFolder(shell, SWT.BORDER);
Rectangle clientArea = shell.getClientArea();
tabFolder.setLocation(clientArea.x, clientArea.y);
// First Tab Item
TabItem item = new TabItem(tabFolder, SWT.NONE);
item.setText("TabItem " + 1);
Composite comp = new Composite(tabFolder, SWT.NONE);
GridLayout gl = new GridLayout();
GridData wgd = new GridData(GridData.FILL_BOTH);
comp.setLayout(gl);
comp.setLayoutData(wgd);
Button button = new Button(comp, SWT.PUSH);
button.setText("Page " + 1);
Button button2 = new Button(comp, SWT.PUSH);
button2.setText("Page " + 1);
Button button3 = new Button(comp, SWT.PUSH);
button3.setText("Page " + 1);
Button button4 = new Button(comp, SWT.PUSH);
button4.setText("Page " + 1);
item.setControl(comp);
ScrolledComposite sc = new ScrolledComposite(tabFolder, SWT.BORDER
            | SWT.H_SCROLL | SWT.V_SCROLL);
// second tab item
TabItem item2 = new TabItem(tabFolder, SWT.NONE);
item2.setText("TabItem " + 1);
Composite comp2 = new Composite(tabFolder, SWT.NONE);
GridLayout gl2 = new GridLayout();
GridData wgd2 = new GridData(GridData.FILL_BOTH);
comp2.setLayout(gl2);
comp2.setLayoutData(wgd2);
Button buttonq = new Button(comp2, SWT.PUSH);
buttonq.setText("Page " + 1);
Button button2q = new Button(comp2, SWT.PUSH);
button2q.setText("Page " + 1);
sc.setContent(comp2);
sc.setExpandHorizontal(true);
sc.setExpandVertical(true);
sc.setMinSize(comp2.computeSize(SWT.DEFAULT, SWT.DEFAULT));
sc.setShowFocusedControl(true);
item2.setControl(comp2);
tabFolder.pack();
shell.pack();
shell.open();
while (!shell.isDisposed()) {
    if (!display.readAndDispatch())
        display.sleep();
}
display.dispose();

当我添加以下代码时，tabItem2 为空：

item2.setControl(comp2);

请帮我解决这个问题

Answer 1

这里有几件事。

首先使用所有内容的布局。tabFolder.setLocation引起混淆，请改用FillLayout。

所以更换

Rectangle clientArea = shell.getClientArea();
tabFolder.setLocation(clientArea.x, clientArea.y);

跟

shell.setLayout(new FillLayout());

其次，第二个选项卡的Composite必须归ScrolledComposite所有。

所以改变

Composite comp2 = new Composite(tabFolder, SWT.NONE);

自

Composite comp2 = new Composite(sc, SWT.NONE);

最后，ScrolledComposite必须是第二个选项卡的控件，因此更改

item2.setControl(comp2);

自

item2.setControl(sc);