java - 两个 Eclipse UI Form 部分捕获多余的垂直空间并正确折叠？

Question

我正在尝试创建一个具有三个可折叠部分的 Eclipse Form，一个固定大小，另外两个应该捕获编辑器窗口中所有剩余的垂直空间，这样，当其中一个底部部分折叠时，另一个一个将填满所有可用空间。

我已阅读forms article ，尝试了 grabExcessVerticalSpace 和 SWT.FILL 的多种变体以及这些部分的 GridData 必须提供的几乎所有内容，但没有成功。我还尝试将客户端部分嵌套在 grabExcess...Space 的复合 Material 中，但这也无济于事。调用 layout() 没有帮助，折叠部分时表单重排，折叠第一部分工作正常。

这是一个包含三个部分的表单的代码，但其中两个底部部分在折叠时只放弃了一小部分空间，而不是我想要的全部:

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.forms.IManagedForm;
import org.eclipse.ui.forms.SectionPart;
import org.eclipse.ui.forms.editor.FormEditor;
import org.eclipse.ui.forms.editor.FormPage;
import org.eclipse.ui.forms.events.ExpansionAdapter;
import org.eclipse.ui.forms.events.ExpansionEvent;
import org.eclipse.ui.forms.widgets.FormToolkit;
import org.eclipse.ui.forms.widgets.Section;

public class SectionFormPage extends FormPage {
    private IManagedForm managedForm;

    public SectionFormPage(FormEditor editor) {
        super(editor, "sectionEditor", "title");
    }

    protected void createFormContent(IManagedForm managedForm) {
        this.managedForm = managedForm;
        FormToolkit toolkit = managedForm.getToolkit();
        Composite body = managedForm.getForm().getBody();

        body.setLayout(new GridLayout());

        createSectionWithButton(toolkit, body, new GridData(SWT.FILL, SWT.FILL, true, false));
        createSectionWithButton(toolkit, body, new GridData(SWT.FILL, SWT.FILL, true, true));
        createSectionWithButton(toolkit, body, new GridData(SWT.FILL, SWT.FILL, true, true));

        body.layout();
    }

    private void createSectionWithButton(FormToolkit toolkit, final Composite body, final GridData layoutData) {
        Section section = createSection(toolkit, body, "Section");
        section.setLayoutData(layoutData);
        section.setClient(toolkit.createButton(section, "button", SWT.NONE));
    }

    private Section createSection(final FormToolkit toolkit, final Composite body, String title) {
        Section section = toolkit.createSection(body, Section.TITLE_BAR | Section.TWISTIE | Section.EXPANDED);
        section.setText(title);
        managedForm.addPart(new SectionPart(section));
        section.addExpansionListener(new ExpansionAdapter() {
            public void expansionStateChanged(ExpansionEvent e) {
                managedForm.reflow(true);
            }
        });
        return section;
    }
}

有什么指点吗？甚至应该在哪里为部门或他们的 parent 或客户指定布局？提前致谢!

Answer 1

我终于找到了一位同事来研究这个，我们一起立即找到了解决方案，诀窍是简单地将 GridData 修改为 not grabExcessVerticalSpace 当部分折叠时:

private void createSectionWithButton(FormToolkit toolkit, final Composite body, final GridData layoutData) {
    final Section section = createSection(toolkit, body, "Section", layoutData.grabExcessVerticalSpace);
    section.setLayoutData(layoutData);
    section.setClient(toolkit.createButton(section, "button", SWT.NONE));
}

private Section createSection(final FormToolkit toolkit, final Composite body, String title,
        boolean shouldGiveUpVerticalSpaceWhenFolded) {
    final Section section = toolkit.createSection(body, Section.TITLE_BAR | Section.TWISTIE | Section.EXPANDED);
    section.setText(title);
    managedForm.addPart(new SectionPart(section));
    if (shouldGiveUpVerticalSpaceWhenFolded) {
        section.addExpansionListener(new ExpansionAdapter() {
            public void expansionStateChanged(ExpansionEvent e) {
                GridData gridData = (GridData) section.getLayoutData();
                gridData.grabExcessVerticalSpace = e.getState();
            }
        });
    }
    section.addExpansionListener(new ExpansionAdapter() {
        public void expansionStateChanged(ExpansionEvent e) {
            managedForm.reflow(true);
        }
    });
    return section;
}

我一直坚持我的想法，即必须可以通过某种方式用布局来定义它。我仍然有兴趣知道它是否是。