TB10.1 Example Applications: examples/Graphics/WS/transparent/transparent

00001 // Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
-00002 // All rights reserved.
-00003 // This component and the accompanying materials are made available
-00004 // under the terms of "Eclipse Public License v1.0"
-00005 // which accompanies this distribution, and is available
-00006 // at the URL "http://www.eclipse.org/legal/epl-v10.html".
-00007 //
-00008 // Initial Contributors:
-00009 // Nokia Corporation - initial contribution.
-00010 //
-00011 // Contributors:
-00012 //
-00013 // Description:
-00014 // This provides various functions for window event handling, control and access.
-00015 //
-00016 
-00017 
-00018 
-00023 #include "transparent.h"
-00028 static TInt CallDoChangeTransparencyL(TAny *aPtr)
-00029         {
-00030         return (static_cast<CTransparentUtil *> (aPtr)->DoChangeTransparencyL());
-00031         }
-00032 
-00037 static TInt CallDoSetTransparentRegion(TAny *aPtr)
-00038         {
-00039         return (static_cast<CTransparentUtil *> (aPtr)->DoSetTransparentRegion());
-00040         }
-00041 
-00045 CTransparentUtil::CTransparentUtil()
-00046         {
-00047         }
-00048 
-00053 CTransparentUtil* CTransparentUtil::NewL()
-00054         {
-00055         CTransparentUtil* self = new(ELeave) CTransparentUtil();
-00056         CleanupStack::PushL(self);
-00057         self->ConstructL();
-00058         CleanupStack::Pop(self);
-00059         return self;
-00060         }
-00061 
-00065 CTransparentUtil::~CTransparentUtil()
-00066         {
-00067         if(iPeriodicObject->IsActive())
-00068             {
-00069             iPeriodicObject->Cancel();
-00070             }
-00071         delete iPeriodicObject;
-00072         delete iBitmapGc;
-00073         delete iBitmapDevice;
-00074         delete iEventHandler;
-00075         
-00076         iForegndWindowTrans.Close();
-00077         iFgndWinTransRegion.Close();    
-00078         iBackgndWindow.Close();
-00079         iGroup.Close();
-00080 
-00081         delete iGc;
-00082         delete iScr;
-00083         iWs.Close();
-00084         }
-00085 
-00093 void CTransparentUtil::ConstructL()
-00094         {
-00095         // Connect the client session to the window server.
-00096         User::LeaveIfError(iWs.Connect());
-00097 
-00098         // Construct a new screen device attached to the window server session.
-00099         iScr = new(ELeave) CWsScreenDevice(iWs);
-00100         User::LeaveIfError(iScr->Construct(0)); // screen number (0 is first screen)
-00101 
-00102         // Create the graphics context  but do not initialise
-00103         iGc = new(ELeave) CWindowGc(iScr);
-00104 
-00105         // Complete construction
-00106         User::LeaveIfError(iGc->Construct());
-00107 
-00108         // Create an initialised window group handle within the session.
-00109         iGroup  = RWindowGroup(iWs);
-00110         User::LeaveIfError(iGroup.Construct((TUint)&iGroup, ETrue));
-00111 
-00112         // Initialise the background window handle
-00113         iBackgndWindow = RWindow(iWs);
-00114 
-00115         // Initialise the foreground window handle to demonstrate TransparencyVariance(). 
-00116         iForegndWindowTrans = RWindow(iWs);
-00117 
-00118     // Initialise the foreground window handle to demonstrate TransparentRegionL()
-00119         iFgndWinTransRegion = RWindow(iWs);
-00120         
-00121         // Create the CPeriodic object to generate periodic events
-00122         iPeriodicObject=CPeriodic::NewL(CActive::EPriorityUserInput);
-00123         
-00124     // Construct the event handler
-00125     iEventHandler = CEventHandler::NewL(iWs);   
-00126 
-00127         // Construct foreground and background windows
-00128         User::LeaveIfError(iBackgndWindow.Construct(iGroup, (TUint)&iBackgndWindow));
-00129         User::LeaveIfError(iForegndWindowTrans.Construct(iGroup, (TUint)&iForegndWindowTrans));
-00130         User::LeaveIfError(iFgndWinTransRegion.Construct(iGroup, (TUint)&iFgndWinTransRegion));
-00131 
-00132         iForegndWindowTrans.SetRequiredDisplayMode(EColor16MA); 
-00133         iFgndWinTransRegion.SetRequiredDisplayMode(EColor16MA); 
-00134         
-00135     // Set background window size
-00136     TSize bgRectSize(iScr->SizeInPixels().iWidth/2,iScr->SizeInPixels().iHeight);
-00137     iBackgndWindow.SetExtent(TPoint(),bgRectSize);
-00138     iBackgndWindow.Activate();
-00139 
-00140     // Set the size of the foreground window to span the upper half of the background window
-00141     TSize fgRectSize(iScr->SizeInPixels().iWidth/2,iScr->SizeInPixels().iHeight/2);
-00142     iForegndWindowTrans.SetExtent(TPoint(),fgRectSize);
-00143     //Enable the use of alpha channel to vary foreground window's transparency
-00144     User::LeaveIfError(iForegndWindowTrans.SetTransparencyAlphaChannel());
-00145     iForegndWindowTrans.Activate();
-00146     
-00147     // Set the size of the foreground window to overlap the bottom half of the background window
-00148     iFgndWinTransRegion.SetExtent(TPoint(0, iScr->SizeInPixels().iHeight/2),fgRectSize);
-00149 
-00150     //Enable the use of alpha channel to vary foreground window's transparency
-00151     User::LeaveIfError(iFgndWinTransRegion.SetTransparencyAlphaChannel()); 
-00152     iFgndWinTransRegion.Activate();
-00153     
-00154     TRect circleRect(TPoint(80,50), TSize(170, 170));   
-00155     //Draw the background window using the colour specified by the second parameter 
-00156     //and draw a circle on top of it with the colour specified by the third parameter. 
-00157     _LIT(KBackGrndWindow, "Background window");
-00158     DrawWindow(iBackgndWindow, TRgb(234,234,236), TRgb(0,255,0), circleRect , KBackGrndWindow);
-00159     
-00160     //issue request to the event handler. 
-00161     iEventHandler->IssueRequest();
-00162         }
-00163 
-00171 void CTransparentUtil::DrawWindow(RWindow& aWindow, TRgb aColor1, TRgb aColor2, TRect aRect, const TDesC& aText)
-00172         {
-00173         aWindow.Invalidate();
-00174         aWindow.BeginRedraw();
-00175         iGc->Activate(aWindow);
-00176 
-00177         iGc->SetBrushStyle(CGraphicsContext::ESolidBrush);
-00178         iGc->SetPenStyle(CGraphicsContext::ENullPen);
-00179         iGc->SetBrushColor(aColor1);
-00180         iGc->Clear();
-00181         iGc->SetBrushColor(aColor2);
-00182         iGc->DrawEllipse(aRect);
-00183     iGc->UseFont(iEikonEnv->NormalFont());
-00184     iGc->DrawText(aText, TPoint(10, aWindow.Size().iHeight/2 + 5));
-00185         iGc->Deactivate();
-00186         aWindow.EndRedraw();
-00187         iWs.Flush();
-00188         }
-00189 
-00197 void CTransparentUtil::TransparencyVarianceL()
-00198         { 
-00199         //Clear the foreground windows to the selected colour. 
-00200         ClearWindow(iWs, iForegndWindowTrans, iGc, TRgb::Gray16(10));
-00201               
-00202         // Issue request to the active scheduler after receiving the event.
-00203          if((iPeriodicObject->IsActive()))
-00204              {       
-00205              iPeriodicObject->Cancel();
-00206              }
-00207      iPeriodicObject->Start(0,KDelay,TCallBack(CallDoChangeTransparencyL,this));
-00208         }
-00209 
-00217 void CTransparentUtil::ClearWindow(RWsSession& aSession, RWindow& aWindow, CWindowGc* aGc, TRgb aColor)
-00218         {
-00219         aWindow.Invalidate();
-00220         aWindow.BeginRedraw();
-00221         aGc->Activate(aWindow);
-00222         aGc->SetBrushColor(aColor);
-00223         aGc->Clear();
-00224         aGc->Deactivate();
-00225         aWindow.EndRedraw();
-00226         aSession.Flush();
-00227         }
-00228 
-00234 TBool CTransparentUtil::DoChangeTransparencyL()
-00235         {
-00236         //iAlphaValue is the alpha value and the foreground window is redrawn to show 
-00237         //periodic transparency change. 
-00238         iForegndWindowTrans.SetBackgroundColor( TRgb(255,0, 0, iAlphaValue));
-00239 
-00240         TRect drawEllipse(TPoint(170, 45), TSize(65, 45));
-00241         _LIT(KForeGrndWindowforTrans, "Foreground window for Vary Tra...");
-00242         DrawWindow(iForegndWindowTrans, TRgb(255,0,0,iAlphaValue), TRgb(100,100,100, iAlphaValue), drawEllipse, KForeGrndWindowforTrans);
-00243 
-00244         iAlphaValue += 20;
-00245         if (iAlphaValue < 255)
-00246                 {
-00247                 return ETrue;
-00248                 }
-00249         else
-00250                 {
-00251                 iAlphaValue=0;
-00252                 iPeriodicObject->Cancel();
-00253                 return EFalse;
-00254                 }
-00255         }
-00256 
-00263 void CTransparentUtil::TransparentRegionL()
-00264         {   
-00265     //iBoolVisible is a boolean variable used to toggle the visibility of foreground
-00266     //window on TransparentRegionL().. button press
-00267     if(iBoolVisible)
-00268         {
-00269         iFgndWinTransRegion.SetVisible(EFalse);
-00270         iBoolVisible = EFalse; 
-00271         iWs.Flush();
-00272         }
-00273     else
-00274         {  
-00275         iFgndWinTransRegion.SetVisible(ETrue);       
-00276         
-00277         //set background colour of the foreground window as blue and alpha value as 50. 
-00278         iFgndWinTransRegion.SetBackgroundColor(TRgb(0, 0 , 255 , 50));
-00279     
-00280         //create a rectsize which is half the size of the foreground window. 
-00281         TSize rectsize1(iScr->SizeInPixels().iWidth/2,iScr->SizeInPixels().iHeight/4);
-00282         TRect chopRect1(TPoint(0, iScr->SizeInPixels().iHeight/4), rectsize1);
-00283         
-00284         //Take a region which is the lower half of the foreground window. 
-00285         iRegion = TRegionFix<2>(chopRect1);
-00286         //Use SetTransparentRegion() to keep only the region specified by iRegion as transparent.
-00287         iFgndWinTransRegion.SetTransparentRegion(iRegion);
-00288     
-00289         //Invalidate and begin redraw on the opaque region of the foreground window. 
-00290         TRect chopRect2(TPoint(0, 0), rectsize1);
-00291         //Draw a circle on the opaque region of the foreground window. 
-00292         TRect circleRect2(TPoint(60,20), TSize(40, 40));
-00293         _LIT(KOpqRegion, "Opaque region of the transparent window");
-00294         DrawWindowRegion(iFgndWinTransRegion, TRgb(255, 255, 0), TRgb(100, 100, 0), chopRect2, circleRect2, KOpqRegion, TPoint(10, 15)); 
-00295         
-00296         //Invalidate and begin redraw on the transparent region of the foreground window. 
-00297         TRect circleRect3(TPoint(110,80), TSize(40, 40));
-00298         _LIT(KTransRegion, "Transparent region of the transparent window");
-00299         DrawWindowRegion(iFgndWinTransRegion, TRgb(0, 0 , 255 , 50), TRgb(255,0,0, 100), chopRect1, circleRect3, KTransRegion, TPoint(10, 75)); 
-00300         iBoolVisible = ETrue; 
-00301         }
-00302         }
-00303 
-00314 void CTransparentUtil::DrawWindowRegion(RWindow& aWindow, TRgb aColor1, TRgb aColor2, TRect aChopRect, TRect aRect, const TDesC& aText, const TPoint& aPoint)
-00315     {
-00316     aWindow.Invalidate(aChopRect);
-00317     aWindow.BeginRedraw(aChopRect);
-00318     iGc->Activate(aWindow);
-00319 
-00320     iGc->SetBrushStyle(CGraphicsContext::ESolidBrush);
-00321     iGc->SetPenStyle(CGraphicsContext::ENullPen);
-00322 
-00323     iGc->SetBrushColor(aColor1);
-00324     iGc->Clear();
-00325         
-00326     iGc->SetBrushColor(aColor2);
-00327     iGc->DrawEllipse(aRect);
-00328     iGc->SetBrushColor(TRgb(0, 0, 0)); 
-00329     iGc->UseFont(iEikonEnv->NormalFont());
-00330     iGc->DrawText(aText, aPoint);
-00331     iGc->Deactivate();
-00332     aWindow.EndRedraw();
-00333     iWs.Flush();
-00334     }
-
examples/Graphics/WS/transparent/transparent_util.cpp
