Gef中MultiPageEditorPart中属性页和Outline的使用

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当使用Eclipse的多页签Editor时，如果按照单个Editor的Property页和Outline的设计，会出现两个Editor使用同一个CommandStack和多页签的Outline不能切换的问题，经过试验以两个页签为例使用下面的解决方案：建立在于MultPageEditorPart级别的IPropertySheetPage和IContentOutlinePage然后通过获取MultiPageEditorPart的pageChange(int index)方法来动态的设置相应的Property和Outline。具体是先步骤：
1.建立MultiPageEditorPart的子类FormEditor，主要实现CreatePages方法，在这个方法里边具体是的实现相应两个子Editor的初始化工作，并且使用阿addPage(Editor,EditorInput)方法把它们加入到MultiPageEditorPart中
2.实现相应的getAdapter(Class)方法，当传入的Class是IPropertySheetPage和IContentOutlinePage的时候，初始化相应的MultiPageEditorPart级别的PropertySheetPage和ContentOutlinePage,这两个类的实现代码如下：


import java.util.HashMap;
import java.util.Map;

import org.eclipse.jface.viewers.ISelection;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.ui.IActionBars;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.SubActionBars;
import org.eclipse.ui.part.PageBook;
import org.eclipse.ui.views.properties.IPropertySheetPage;
import org.eclipse.ui.views.properties.PropertySheetPage;

/**
 * @author kang.ao
 *
 *  
 */
public class FormPropertySheetPage extends PropertySheetPage implements IPropertySheetPage {
	private PageBook pagebook;
	private Map recMap = new HashMap();
	private PropertySheetPage defaultPage;
	private IActionBars actionBars;
	private IPropertySheetPage currentPage;
	private boolean disposed = false;

	class PageRec {
		IPropertySheetPage page;
		SubActionBars bars;
		void setBarsActive(boolean active) {
			if (active)
				bars.activate();
			else
				bars.deactivate();
		}
	}

	public FormPropertySheetPage() {
		defaultPage = new PropertySheetPage();
	}

	public void createControl(Composite parent) {
		pagebook = new PageBook(parent, SWT.NULL);
		defaultPage.createControl(pagebook);
		if (currentPage != null)
			setPageActive(currentPage);
	}
	private PageRec createPageRec(IPropertySheetPage page) {
		if (actionBars == null)
			return null;
		PageRec rec = new PageRec();
		rec.page = page;

		rec.bars = new SubActionBars(actionBars);
		getPageControl(page);

		page.setActionBars(rec.bars);
		recMap.put(page, rec);
		return rec;
	}
	public void dispose() {
		updateActionBars();

		if (pagebook != null && !pagebook.isDisposed())
			pagebook.dispose();
		pagebook = null;
		disposed = true;
        super.dispose();
	}

	public boolean isDisposed() {
		return disposed;
	}

	public Control getControl() {
		return pagebook;
	}
	private Control getPageControl(IPropertySheetPage page) {
		Control control = page.getControl();
		if (control == null || control.isDisposed()) {
			// first time
			page.createControl(pagebook);
			control = page.getControl();
		}
		return control;
	}
	public void selectionChanged(IWorkbenchPart part, ISelection sel) {
		if (currentPage != null)
			currentPage.selectionChanged(part, sel);
	}
	public void setActionBars(IActionBars bars) {
		this.actionBars = bars;

		createPageRec(defaultPage);

		if (currentPage != null) {
			PageRec rec = createPageRec(currentPage);
			setPageActive(rec);
			updateActionBars();
		}
	}
	public void setDefaultPageActive() {
		setPageActive(defaultPage);
	}
	public void setFocus() {
		if (currentPage != null)
			currentPage.setFocus();
	}
	private void setPageActive(PageRec pageRec) {
		IPropertySheetPage page = pageRec.page;
		Control control = getPageControl(page);
		pagebook.showPage(control);
		pageRec.setBarsActive(true);
	}
	public void setPageActive(IPropertySheetPage page) {
		IPropertySheetPage oldPage = currentPage;
		this.currentPage = page;
		if (pagebook == null) {
			return;
		}
		if (oldPage != null) {
			PageRec oldRec = (PageRec) recMap.get(oldPage);
			if (oldRec != null) {
				oldRec.setBarsActive(false);
			}
		}
		PageRec rec = (PageRec) recMap.get(page);
		if (rec == null) {
			rec = createPageRec(page);
		}
		if (rec != null) {
			setPageActive(rec);
			updateActionBars();
		}
	}
	private void updateActionBars() {
		actionBars.updateActionBars();
	}

}

OutlinePage：

/*
 * 创建日期 Oct 31, 2005
 *
 */
package com.kenoah.kde.formdesignerX;

import org.eclipse.gef.EditPartViewer;
import org.eclipse.gef.ui.parts.ContentOutlinePage;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.action.IToolBarManager;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.ui.IActionBars;
import org.eclipse.ui.part.IPageSite;
import org.eclipse.ui.part.PageBook;
import org.eclipse.ui.views.contentoutline.IContentOutlinePage;

import com.kenoah.kde.formdesignerX.utils.FormdesignerImages;

/**
 * @author kang.ao
 *
 *  
 */
public class FormContentOutline extends ContentOutlinePage implements IContentOutlinePage {

    private PageBook pagebook;
	private IContentOutlinePage currentPage;
	private boolean disposed;
    private IAction showOutlineAction, showOverviewAction;
    public static final int ID_OUTLINE = 0;
    public static final int ID_OVERVIEW = 1;

	public FormContentOutline(EditPartViewer viewer) {
	    super(viewer);
	}
	/**
	 * @see org.eclipse.ui.part.IPage#createControl(Composite)
	 */
	public void createControl(Composite parent) {
		pagebook = new PageBook(parent, SWT.NONE);
		configureOutlineViewer();
		if (currentPage != null)
			setPageActive(currentPage);
        showPage(ID_OUTLINE);
	}

	private void configureOutlineViewer() {
        IToolBarManager tbm = getSite().getActionBars().getToolBarManager();
        showOutlineAction = new Action() {
            public void run() {
                showPage(ID_OUTLINE);
            }
        };
        showOutlineAction.setImageDescriptor(FormdesignerImages.getImageDescriptor(FormdesignerImages.OUTLINE));
        tbm.add(showOutlineAction);
        showOverviewAction = new Action() {
            public void run() {
                showPage(ID_OVERVIEW);
            }
        };
        showOverviewAction.setImageDescriptor(FormdesignerImages
                .getImageDescriptor(FormdesignerImages.OVERVIEW));
        tbm.add(showOverviewAction);
    }
    protected void showPage(int id_outline2) {
        if(currentPage instanceof IOutlinePageShowPage){
            ((IOutlinePageShowPage)currentPage).showPage(id_outline2);
            if(id_outline2==ID_OVERVIEW){
                showOutlineAction.setChecked(false);
                showOverviewAction.setChecked(true);
            }else{
                showOutlineAction.setChecked(true);
                showOverviewAction.setChecked(false);
            }
        }

    }
    private int getCurrentPageId(){
        if(showOverviewAction!=null && showOutlineAction!=null){
            if(showOverviewAction.isChecked())
                return ID_OVERVIEW;
            if(showOutlineAction.isChecked()){
                return ID_OUTLINE;
            }
        }
        return ID_OUTLINE;
    }
    /**
	 * @see org.eclipse.ui.part.IPage#dispose()
	 */
	public void dispose() {
		if (pagebook != null && !pagebook.isDisposed())
			pagebook.dispose();
		pagebook = null;
		disposed = true;
	}

	public boolean isDisposed() {
		return disposed;
	}

	/**
	 * @see org.eclipse.ui.part.IPage#getControl()
	 */
	public Control getControl() {
		return pagebook;
	}

	/**
	 * @see org.eclipse.ui.part.IPage#setActionBars(IActionBars)
	 */
	public void setActionBars(IActionBars actionBars) {
	}

	/**
	 * @see org.eclipse.ui.part.IPage#setFocus()
	 */
	public void setFocus() {
		if (currentPage != null)
			currentPage.setFocus();
	}

	/**
	 * @see org.eclipse.jface.viewers.ISelectionProvider#addSelectionChangedListener(ISelectionChangedListener)
	 */
	public void addSelectionChangedListener(ISelectionChangedListener listener) {
		if (currentPage != null)
			currentPage.addSelectionChangedListener(listener);
	}

	/**
	 * @see org.eclipse.jface.viewers.ISelectionProvider#getSelection()
	 */
	public ISelection getSelection() {
		return (currentPage != null) ? currentPage.getSelection() : null;
	}

	/**
	 * @see org.eclipse.jface.viewers.ISelectionProvider#removeSelectionChangedListener(ISelectionChangedListener)
	 */
	public void removeSelectionChangedListener(ISelectionChangedListener listener) {
		if (currentPage != null)
			currentPage.removeSelectionChangedListener(listener);
	}

	/**
	 * @see org.eclipse.jface.viewers.ISelectionProvider#setSelection(ISelection)
	 */
	public void setSelection(ISelection selection) {
		if (currentPage != null)
			currentPage.setSelection(selection);
	}

	public void setPageActive(IContentOutlinePage page) {
		this.currentPage = page;
		if (pagebook == null) {
			return;
		}
        if(getSite()!=null){
            if(page instanceof ContentOutlinePage){
                ((ContentOutlinePage)page).init(getSite());
            }
            Control control = page.getControl();
            if (control == null || control.isDisposed()) {
                page.createControl(pagebook);
                control = page.getControl();
                
            }
            pagebook.showPage(control);
            showPage(getCurrentPageId());
        }
	}
    
    public void init(IPageSite pageSite) {
        super.init(pageSite);
    }
}

在MultiPageEditorPart的 protected void pageChange(int newPageIndex)；方法中进行更新当前的激活Editor的PropertySheetPage和OutlinePage，方法如下：
更新PropertySheet：

    void updatePropertySheet(IEditorPageBase part) {
        if (part != null) {
            IPropertySheetPage propertySheetPage = part.getPropertySheetPage();
            if (propertySheetPage != null) {
                propertySheet.setPageActive(propertySheetPage);
            } else {
                propertySheet.setDefaultPageActive();
            }
        }
    }

更新OutlinePage：

    void updateOutline(IEditorPageBase part) {
        IContentOutlinePage page = null;
        if (part != null) {
            page = ((IEditorPageBase) part).getOutlinePage();
            if (page != null && contentOutline!=null)
                contentOutline.setPageActive(page);
        }
    }

具体的子Editor中的获得PropertySheet和OutlinePage的方法可以参照Gef例子中的编写，在子Editor中初始化Outline的时候由于同一使用MultiPageEditorPart中的OutlinePage的Action，所以在子Editor的OutlinePage中不能去设定Action按钮，具体的参照FormContentOutline的Action的初始化，这点是与gef例子中给的不同的！

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