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[platform-ui-dev] Restore a workbenchpage with an external memento.xml without closing eclipse 3.1 
Hello everybody,

I am having a problem concerning a restore of a workbench page.
Reading the bug track from Bug 85373 - [RCP] Missing save/restore capabilities of workbench state https://bugs.eclipse.org/bugs/show_bug.cgi?id=85373
I' ve got some insight concerning the concept of using the restore mechanism in eclipse 3.1 and the ideas for following releases. I am not sure if I encountered a bug or if my approach is wrong. 

Use Case:
I want to switch Perspectives, during runtime and have the page set (restored) to a predefined state saved previously in a XMLMemento (same format as the workbech.xml in ../.metadata/.plugins/org.eclipse.ui.workbench/ ) coming from somewhere in my file system. The views and editors are opened correctly according to the memento, the only problem I have is that every time I call WorkbenchPage.restoreState( IMemento myCustomMemento), the editor area is split in half (this is definitely not in the memento), where the one half is correctly stacked with the right editors, but the other half is just painted grey. If I randomly move the opened editors around the grey areas disappears suddenly and the page looks find now. Could this be an event problem or do I use the frame work in the wrong way.
the following method performs the switch to another perspective and its population with a predefined state from the Memento:
public static boolean nextPerspective(String urlWithPageState, String perspectiveID, IWorkbenchPage activePage) 
{

       final IWorkbench workbench = PlatformUI.getWorkbench();
final IPerspectiveRegistry registry = workbench.getPerspectiveRegistry(); 

       try {
XMLMemento memento = XMLMemento.createReadRoot(new FileReader( urlWithPageState)); IMemento windowMemento = memento.getChild(IWorkbenchConstants.TAG_WINDOW); IMemento pageMemento = windowMemento.getChild(IWorkbenchConstants.TAG_PAGE);
IPerspectiveDescriptor realDesc = registry.findPerspectiveWithId(perspectiveID); IPerspectiveDescriptor oldPerspectiveDesc = activePage.getPerspective(); 
           activePage.closePerspective(oldPerspectiveDesc, true, false);

           ((WorkbenchPage) activePage).restoreState(pageMemento, null);
           activePage.setPerspective(realDesc);
           activePage.resetPerspective();

       } catch (IOException e) {
           e.printStackTrace();
           handleException(e, page);
           return false;
       } catch (WorkbenchException e) {
           e.printStackTrace();
           handleException(e, page);
           return false;
       }

       return true;
   }

XML Memento:

<?xml version="1.0" encoding="UTF-8"?>
<workbench version="2.0" progressCount="13">
<workbenchAdvisor/>
<window maximized="true" x="132" y="132" width="1024" height="768">
<fastViewData fastViewLocation="1024"/>
<perspectiveBar>
<itemSize x="160"/>
</perspectiveBar>
<coolbarLayout locked="0">
<coolItem id="group.file" itemType="typeGroupMarker"/>
<coolItem id="org.eclipse.ui.workbench.file" itemType="typeToolBarContribution" x="95" y="22"/> 
<coolItem id="additions" itemType="typeGroupMarker"/>
<coolItem id="KalypsoDSSPlanerClient.actionSet" itemType="typeToolBarContribution" x="59" y="22"/> <coolItem id="org.eclipse.debug.ui.launchActionSet" itemType="typeToolBarContribution" x="49" y="22"/> <coolItem id="org.eclipse.search.searchActionSet" itemType="typeToolBarContribution" x="36" y="22"/> 
<coolItem id="group.nav" itemType="typeGroupMarker"/>
<coolItem id="org.eclipse.ui.workbench.navigate" itemType="typeToolBarContribution" x="108" y="22"/> 
<coolItem id="group.editor" itemType="typeGroupMarker"/>
<coolItem id="org.eclipse.ui.DefaultTextEditor" itemType="typeToolBarContribution" x="-1" y="-1"/> 
<coolItem id="group.help" itemType="typeGroupMarker"/>
<coolItem id="org.eclipse.ui.workbench.help" itemType="typeToolBarContribution" x="-1" y="-1"/> 
</coolbarLayout>
<page label="&lt;Unknown Label&gt; - Kalypso Planer-Client Phase 2" focus="true"> 
<editors>
<editorArea activeWorkbook="DefaultEditorWorkbook">
<info part="DefaultEditorWorkbook">
<folder expanded="2" appearance="1">
<presentation id="org.eclipse.ui.presentations.WorkbenchPresentationFactory"> 
<part id="0"/>
</presentation>
</folder>
</info>
<info part="org.eclipse.ui.internal.EditorStack@45f4ae" relative="DefaultEditorWorkbook" relationship="4" ratioLeft="335" ratioRight="336" ratio="0.49925485"> 
<folder expanded="2" appearance="1">
<presentation id="org.eclipse.ui.presentations.WorkbenchPresentationFactory"> 
<part id="0"/>
</presentation>
</folder>
</info>
</editorArea>
<editor title="phase2.txt" name="phase2.txt" id="org.eclipse.ui.DefaultTextEditor" tooltip="MyTestProject/phase2.txt" partName="phase2.txt" workbook="DefaultEditorWorkbook" activePart="true" focus="true" path="D:/eclipse3.1/runtime-workspace/MyTestProject/phase2.txt"> <input factoryID="org.eclipse.ui.part.FileEditorInputFactory" path="/MyTestProject/phase2.txt"/> 
</editor>
<editor title="filelInFolder2.txt" name="filelInFolder2.txt" id="org.eclipse.ui.DefaultTextEditor" tooltip="MyTestProject/Folder2/filelInFolder2.txt" partName="filelInFolder2.txt" workbook="org.eclipse.ui.internal.EditorStack@45f4ae" focus="true" path="D:/eclipse3.1/runtime-workspace/MyTestProject/Folder2/filelInFolder2.txt"> <input factoryID="org.eclipse.ui.part.FileEditorInputFactory" path="/MyTestProject/Folder2/filelInFolder2.txt"/> 
</editor>
</editors>
<views>
<view id="org.kalypso.dss.planerclient.view.browser" partName="Kalypso Browser"> 
<viewState url="file:///D:/TEMP/Perspectives/DssPlanerClient.htm">
<scrolbars/>
</viewState>
</view>
<view id="org.eclipse.ui.views.ResourceNavigator" partName="Navigator">
<viewState sorter="1" LINK_NAVIGATOR_TO_EDITOR="1">
<filters>
<filter element="*.class" isEnabled="false"/>
<filter element=".*" isEnabled="true"/>
</filters>
<expanded>
<element path="/MyTestProject"/>
<element path="/MyTestProject/Folder1"/>
<element path="/MyTestProject/Folder2"/>
</expanded>
<selection>
<element path="/MyTestProject/phase2.txt"/>
</selection>
</viewState>
</view>
</views>
<perspectives activePerspective="org.kalypso.dss.planerclient.perspectiv.phase.two" activePart="org.eclipse.ui.DefaultTextEditor"> 
<perspective version="0.016" editorAreaVisible="1" fixed="0">
<descriptor id="org.kalypso.dss.planerclient.perspectiv.phase.two" label="Kalypso Planer-Client Phase 2" class="org.kalypso.dss.planerclient.perspectives.KalypsoDssPlanerPhaseTwoClientPerspectiveFactory"/> 
<alwaysOnActionSet id="org.eclipse.ui.cheatsheets.actionSet"/>
<alwaysOnActionSet id="org.eclipse.search.searchActionSet"/>
<alwaysOnActionSet id="org.eclipse.ui.edit.text.actionSet.openExternalFile"/> 
<alwaysOnActionSet id="org.eclipse.ui.edit.text.actionSet.navigation"/>
<alwaysOnActionSet id="org.eclipse.ui.edit.text.actionSet.convertLineDelimitersTo"/> 
<alwaysOnActionSet id="org.eclipse.ui.externaltools.ExternalToolsSet"/>
<alwaysOnActionSet id="KalypsoDSSPlanerClient.actionSet"/>
<alwaysOnActionSet id="org.eclipse.ui.actionSet.keyBindings"/>
<alwaysOnActionSet id="org.eclipse.update.ui.softwareUpdates"/>
<new_wizard_action id="org.eclipse.ui.wizards.new.folder"/>
<new_wizard_action id="org.eclipse.ui.wizards.new.file"/>
<view id="org.eclipse.ui.views.ResourceNavigator"/>
<view id="org.kalypso.dss.planerclient.view.browser"/>
<layout>
<mainWindow>
<info part="org.eclipse.ui.editorss"/>
<info part="stickyFolderRight" relative="org.eclipse.ui.editorss" relationship="2" ratioLeft="754" ratioRight="252" ratio="0.74950296" folder="true"> 
<folder expanded="2" appearance="2">
<page label="LabelNotFound" content="org.eclipse.help.ui.HelpView"/>
<page label="LabelNotFound" content="org.eclipse.ui.internal.introview"/>
<page label="LabelNotFound" content="org.eclipse.ui.cheatsheets.views.CheatSheetView"/> 
</folder>
</info>
<info part="topRight" relative="org.eclipse.ui.editorss" relationship="2" ratioLeft="653" ratioRight="353" ratio="0.64910537" folder="true"> <folder activePageID="org.eclipse.ui.views.ResourceNavigator" expanded="2" appearance="2"> 
<page label="Navigator" content="org.eclipse.ui.views.ResourceNavigator"/>
<presentation id="org.eclipse.ui.presentations.WorkbenchPresentationFactory"> 
<part id="0"/>
</presentation>
</folder>
</info>
<info part="bottomRight" relative="org.eclipse.ui.editorss" relationship="4" ratioLeft="440" ratioRight="227" ratio="0.6596702" folder="true"> <folder activePageID="org.kalypso.dss.planerclient.view.browser" expanded="2" appearance="2"> <page label="Kalypso Browser" content="org.kalypso.dss.planerclient.view.browser"/> <presentation id="org.eclipse.ui.presentations.WorkbenchPresentationFactory"> 
<part id="0"/>
</presentation>
</folder>
</info>
</mainWindow>
</layout>
</perspective>
</perspectives>
<navigationHistory/>
<stickyState/>
</page>
<workbenchWindowAdvisor/>
<actionBarAdvisor/>
</window>
<mruList>
<file factoryID="org.eclipse.ui.part.FileEditorInputFactory" id="org.eclipse.ui.DefaultTextEditor" name="filelInFolder2.txt" tooltip="MyTestProject/Folder2/filelInFolder2.txt"> 
<persistable path="/MyTestProject/Folder2/filelInFolder2.txt"/>
</file>
<file factoryID="org.eclipse.ui.part.FileEditorInputFactory" id="org.eclipse.ui.DefaultTextEditor" name="phase2.txt" tooltip="MyTestProject/phase2.txt"> 
<persistable path="/MyTestProject/phase2.txt"/>
</file>
<file factoryID="org.eclipse.ui.part.FileEditorInputFactory" id="org.eclipse.ui.DefaultTextEditor" name="fileInFolder1.txt" tooltip="MyTestProject/Folder1/fileInFolder1.txt"> 
<persistable path="/MyTestProject/Folder1/fileInFolder1.txt"/>
</file>
<file factoryID="org.eclipse.ui.part.FileEditorInputFactory" id="org.eclipse.ui.DefaultTextEditor" name="phase1.txt" tooltip="MyTestProject/phase1.txt"> 
<persistable path="/MyTestProject/phase1.txt"/>
</file>
</mruList>
</workbench>
This method is called from the LocationListener.changed(LocationEvent event) of my own BrowserViewer (extends ViewPart and decorates the eclipse BrowserViewer) which allows me to browse different perspectives with a custom state. 

What do I miss here??? Your help is realy appreciated.

Cheers
Christoph

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