--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/taskswitcher/contextengine/tsfswpreviewprovider/wsplugin/inc/previewprovidercrp.h	Tue Jan 26 11:48:23 2010 +0200
@@ -0,0 +1,178 @@
+/*
+* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:  Preview provider ECOM plugin
+*
+*/
+
+
+#ifndef PREVIEWPROVIDERCRP_H
+#define PREVIEWPROVIDERCRP_H
+
+// INCLUDES
+#include <w32std.h>
+#include <graphics/wsgraphicdrawerinterface.h>
+#include <graphics/wsgraphicdrawer.h>
+
+// Number of screenshots used at the same time,
+// each window group change will cause a screenshot
+// to one of these, the index for the current one is
+// switched after each screenshot capture. (this is needed
+// to prevent overwriting screenshots before the client could
+// make a copy of them)
+const TInt KMaxShots = 4;
+
+/**
+ * Preview provider window server ECOM plugin class.
+ */
+NONSHARABLE_CLASS( CPreviewProviderCRP ) : public CWsGraphicDrawer, 
+                                           public MWsEventHandler 
+    {
+public:
+
+    /**
+     * Creates a new instance of the plguin.
+     *
+     * @return Created instance.
+     */ 
+    static CWsGraphicDrawer* CreateL();
+    
+    /**
+     * Destructor
+     */ 
+    ~CPreviewProviderCRP();
+    
+private:
+
+    /**
+     * From CWsGraphicDrawer.
+     *
+     * @param aGc
+     * @param aRect
+     * @param aData
+     */ 
+    void DoDraw( MWsGc& aGc, const TRect& aRect, const TDesC8& aData ) const;
+    
+    /**
+     * Handles message from PreviewProviderClient.
+     *
+     * @param aData Message data.
+     */ 
+    void HandleMessage( const TDesC8& aData );
+
+    /**
+     * 2nd phase constructor.
+     *
+     * @param aEnv
+     * @param aId
+     * @param aOwner
+     * @param aData
+     */     
+    void ConstructL( MWsGraphicDrawerEnvironment& aEnv, 
+                     const TGraphicDrawerId& aId, 
+                     MWsClient& aOwner, 
+                     const TDesC8& aData );
+    
+    /**
+     * From MWsEventHandler.
+     * 
+     * Observer for TWservCrEvent::EWindowGroupChanged to take the screenshot
+     * when application changes.
+     *
+     * @param aEvent
+     */     
+    void DoHandleEvent( const TWservCrEvent& aEvent );
+    
+private:
+
+    /**
+     * 2nd phase constructor.
+     */ 
+    void ConstructL();
+    
+    /**
+     * Handles application registration.
+     *
+     * @param aWgId Window group id.
+     */ 
+    void Register( TInt aWgId );
+    
+    /**
+     * Handler application unregistration.
+     *
+     * @param aWgId Window group id.
+     */     
+    void Unregister( TInt aWgId );
+    
+    /*
+     * Allocate resources and take screenshot
+     */
+    void ScreenshotL();
+    
+    /**
+     * Takes the screenshot.
+     */     
+    void ScreenshotL( CFbsBitmap& aBitmap );
+    
+    /**
+     * Remove bitmap reference fom list
+     */
+    void RemoveScreenshot( TInt aBitmapHandle );
+    
+    /**
+     * Remove all bitmaps overflow
+     */
+    void CheckOverflow();
+    
+    /**
+     * Handles message from PreviewProviderClient.
+     *
+     * @param aData Message data.
+     */     
+    void DoHandleMessageL( const TDesC8& aData );
+    
+    /**
+     * Notifies the PreviewProviderClient when screenshot is ready for copying.
+     */     
+    void ScaleCompleteL(const CFbsBitmap& aBitmap);
+    
+    /**
+     * Notifies the PreviewProviderClient when an application has been exited.
+     */
+    void UnregisterComplete( TInt aWgId );
+    
+    /**
+     * Uses window server front buffer to create a screenshot.
+     * @param aFront preallocated destination bitmap
+     * @param aFront Front buffer. 
+     * @param aSrcSize Size of the source front buffer in pixels.
+     * @param aSrcStride Source stride.
+     */
+    void FrontBufferScreenShot(
+        CFbsBitmap& aBitmap,
+        MWsFrontBuffer& aFront, const TSize& aSrcSize, TInt aSrcStride );  
+    
+private:
+    TInt iScreen;
+    TInt iPrevId;
+    TInt iPrevReg; // to work around the problem with wgid not set when app brought 
+                   // to foreground first time
+    RPointerArray<CFbsBitmap> iScreenshots;
+    TSize iScreenshotSize;
+    TDisplayMode iScreenshotMode;
+    RArray<TInt> iWgIds;
+    };
+
+#endif // PREVIEWPROVIDERCRP_H
+
+// End of file