如何在底部的Eclipse RCP PreferencePage上保留“恢复默认值”和“应用”按钮？

Question

我制作了一个自定义PreferencePage，它会自动创建“Restore Defaults”和“Apply”按钮，但是，它们不会停留在“OK”和“Cancel”按钮正上方的右下角在Eclipse IDE首选项中执行。他们只是在我创建的最后一个小部件后立即停靠。

如何让这些按钮停留在右下角？

以下是我的代码：

public class MVPrefPage extends PreferencePage实现了IWorkbenchPreferencePage {

List<FieldEditor> editors = new ArrayList<>();

public MVPrefPage() {
}

public MVPrefPage(String title) {
    super(title);
}

public MVPrefPage(String title, ImageDescriptor image) {
    super(title, image);
}

@Override
public void init(IWorkbench workbench) {
    setPreferenceStore(MatrixVisualizationActivator.getDefault().getPreferenceStore());
}

@Override
protected Control createContents(Composite parent) {

    editors.add(new BooleanFieldEditor(MatrixSettings.TITLE_ON_PROPERTY, "Show title", parent));
    editors.add(new BooleanFieldEditor(MatrixSettings.SHOW_ROW_HEADERS_PROPERTY, "Show row headers", parent));
    editors.add(new BooleanFieldEditor(MatrixSettings.SHOW_COLUMN_HEADERS_PROPERTY, "Show column headers", parent));
    editors.add(new BooleanFieldEditor(MatrixSettings.SHOW_HIDDEN_VALUES_PROPERTY, "Show hidden values", parent));
    editors.add(new BooleanFieldEditor(MatrixSettings.SHOW_MATRIX_ELEMENT_DISPLAY_NAMES_PROPERTY,
            "Show matrix element display names", parent));
    editors.add(new BooleanFieldEditor(MatrixSettings.CHART_SYNC_HIGHLIGHTER_PROPERTY,
            "Highlight view with chart sync", parent));
    editors.add(new BooleanFieldEditor(MatrixSettings.CHART_SYNC_SCROLL_PROPERTY, "Scroll view with chart sync",
            parent));
    editors.add(new BooleanFieldEditor(MatrixSettings.VIEW_SCROLLBAR_SYNC_PROPERTY, "Add scrollbar to synchronizer",
            parent));

    String[][] entryNamesAndValues = { { "Left", "LEFT" }, { "Right", "RIGHT" }, { "Center", "CENTER" } };
    editors.add(new ComboFieldEditor(MatrixSettings.VIEW_SNAP_PROPERTY, "Grid snap setting", entryNamesAndValues,
            parent));

    editors.stream().forEach(fe -> {
        fe.setPreferenceStore(getPreferenceStore());
        fe.fillIntoGrid(parent, 2);
        fe.load();
    });

    return parent;
}

/*
 * (non-Javadoc)
 * 
 * @see org.eclipse.jface.preference.PreferencePage#performDefaults()
 */
@Override
protected void performDefaults() {
    editors.stream().forEach(fe -> fe.loadDefault());
    super.performDefaults();
}

/*
 * (non-Javadoc)
 * 
 * @see org.eclipse.jface.preference.PreferencePage#performOk()
 */
@Override
public boolean performOk() {
    editors.stream().forEach(fe -> fe.store());
    return super.performOk();
}

/*
 * (non-Javadoc)
 * 
 * @see org.eclipse.jface.preference.PreferencePage#performApply()
 */
@Override
protected void performApply() {
    super.performApply();
}

/*
 * (non-Javadoc)
 * 
 * @see org.eclipse.jface.dialogs.DialogPage#dispose()
 */
@Override
public void dispose() {
    editors.stream().forEach(fe -> fe.dispose());
    super.dispose();
}

Answer 1

您不能在BooleanFieldEditor之外使用FieldEditorPreferencePage这样的字段编辑器类，因为字段编辑希望能够调整页面布局并且它不会被激活不在FieldEditorPreferencePage时才能正常工作。