examples/Graphics/WS/BackedUp/BackedUp.cpp

/*
Copyright (c) 2005-2010 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this
  list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.
* Neither the name of Nokia Corporation nor the names of its contributors
  may be used to endorse or promote products derived from this software
  without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Description:  
*/


#include <w32std.h>
#include "Base.h"
#include "BackedUp.h"

_LIT(KString1,"1");
_LIT(KString2,"2");
_LIT(KString3,"3");
_LIT(KString4,"4");
_LIT(KString5,"5");

enum TBackedUpPanic
        {
        EConnectPanicRedrawToBackedUpWindow,
        };


//                                       CNumberedWindow implementation

/****************************************************************************\
|       Function:       Constructor/Destructor for CNumberedWindow
|       Input:          aClient         Client application that owns the window
\****************************************************************************/
CNumberedWindow::CNumberedWindow (CWsClient* aClient)
: CWindow (aClient), iOldPos(0,0)
        {
        // iNumber is displayed on front of window.
        iNumber = iCount;
        iCount++;
        }


CNumberedWindow::~CNumberedWindow ()
        {
        }


/****************************************************************************\
|       Function:       CNumberedWindow::Draw
|       Purpose:        Redraws the contents of CNumberedWindow within a given
|                               rectangle.  CNumberedWindow displays a number in the window.
|       Input:          aRect   Rectangle that needs redrawing
|       Output:         None
\****************************************************************************/
void CNumberedWindow::Draw(const TRect& aRect)
        {
        const TBufC<1> strings[5] = { *&KString1,
                                                          *&KString2,
                                                          *&KString3,
                                                          *&KString4,
                                                  *&KString5
                                                        };

        CWindowGc* gc=SystemGc(); // get a graphics context
        gc->SetClippingRect(aRect); // clip outside the redraw area
        gc->Clear(aRect); // clear the redraw area
        TSize size=iWindow.Size();
        TInt height=size.iHeight; // Need window height to calculate vertical text offset
        TInt ascent = Font()->AscentInPixels();
        TInt descent = Font()->DescentInPixels();
        TInt offset = (height + (ascent + descent)) / 2; // Calculate vertical text offset
        gc->SetPenColor(TRgb(0,0,0)); // Set pen to black
        gc->UseFont(Font());
        gc->DrawText(strings[iNumber], TRect(TPoint(0,0), size), offset, CGraphicsContext::ECenter);
        gc->DiscardFont();
        }

/****************************************************************************\
|       Function:       CNumberedWindow::HandlePointerEvent
|       Purpose:        Handles pointer events for CNumberedWindow.
|       Input:          aPointerEvent   The pointer event
|       Output:         None
\****************************************************************************/
void CNumberedWindow::HandlePointerEvent (TPointerEvent& aPointerEvent)
        {       
        switch (aPointerEvent.iType)
                {
                case TPointerEvent::EDrag:
                        {
                        TPoint point = aPointerEvent.iParentPosition;
                        TPoint distToMove = point - iOldPos;
                        TPoint position = Window().Position();
                        Window().SetPosition (position + distToMove);
                        iOldPos = point;
                        break;
                        }
                case TPointerEvent::EButton1Down:
                        {
                        // Request drag events 
                        Window().PointerFilter (EPointerFilterDrag,     0);
                        Window().SetOrdinalPosition (0);
                        iOldPos = aPointerEvent.iParentPosition;
                        break;
                        }
                case TPointerEvent::EButton1Up:
                        {
                        // Cancel the request for drag events.
                        Window().PointerFilter (EPointerFilterDrag,     EPointerFilterDrag);
                        break;
                        }
                default:
                        break;
                }
        }


//                                       CMainWindow implementation


/****************************************************************************\
|       Function:       Constructor/Destructor for CMainWindow
|       Input:          aClient         Client application that owns the window
\****************************************************************************/
CMainWindow::CMainWindow (CWsClient* aClient)
: CBackedUpWindow (aClient)
        {
        }


CMainWindow::~CMainWindow ()
        {
        iWindow.Close();
        }

/****************************************************************************\
|       Function:       CMainWindow::Draw
|       Purpose:        Redraws the contents of CMainWindow within a given
|                               rectangle.
|       Input:          aRect   Rectangle that needs redrawing
|       Output:         None
\****************************************************************************/

void CMainWindow::Draw(const TRect& /*aRect*/)
        {
        _LIT(KPanicMsg,"BACKEDUP");
        User::Panic(KPanicMsg,EConnectPanicRedrawToBackedUpWindow);
        }

void CMainWindow::HandlePointerMoveBufferReady ()
        {               
        TPoint pnts[KPointerMoveBufferSize];
        TPtr8 ptr((TUint8 *)&pnts,sizeof(pnts));
        TInt numPnts=Window().RetrievePointerMoveBuffer(ptr);
        CWindowGc* gc=SystemGc();
        gc->Activate(Window());
        for(TInt index=0;index<numPnts;index++) gc->DrawLineTo(pnts[index]);
        gc->Deactivate();
        }

/****************************************************************************\
|       Function:       CMainWindow::HandlePointerEvent
|       Purpose:        Handles pointer events for CMainWindow.
|       Input:          aPointerEvent   The pointer event!
|       Output:         None
\****************************************************************************/

void CMainWindow::HandlePointerEvent (TPointerEvent& aPointerEvent)
        {       
        switch (aPointerEvent.iType)
                {
                case TPointerEvent::EButton1Down:
                        {
                        Window().SetShadowDisabled(EFalse);
                        Window().EnablePointerMoveBuffer();
                        CWindowGc* gc = SystemGc();
                        gc->Activate(Window());
                        gc->MoveTo(aPointerEvent.iPosition);
                        gc->Deactivate();
                        }
                default:
                        break;
                }
        }


//                                       CExampleWsClient implementation

CExampleWsClient* CExampleWsClient::NewL(const TRect& aRect)
        {
        // make new client
        CExampleWsClient* client=new (ELeave) CExampleWsClient(aRect); 
        CleanupStack::PushL(client); // push, just in case
        client->ConstructL(); // construct and run
        CleanupStack::Pop();
        return client;
        }

/****************************************************************************\
|       Function:       Constructor/Destructor for CExampleWsClient
|                               Destructor deletes everything that was allocated by
|                               ConstructMainWindowL()
\****************************************************************************/

CExampleWsClient::CExampleWsClient(const TRect& aRect)
:iRect(aRect)
        {
        }

CExampleWsClient::~CExampleWsClient ()
        {
        delete iMainWindow;
        delete iWindow1;
        }


/****************************************************************************\
|       Function:       CExampleWsClient::ConstructMainWindowL()
|                               Called by base class's ConstructL
|       Purpose:        Allocates and creates all the windows owned by this client
|                               (See list of windows in CExampleWsCLient declaration).
\****************************************************************************/

void CExampleWsClient::ConstructMainWindowL()
        {
        // Resources allocated in this function are freed in the CExampleWsClient destructor
        
        iMainWindow=new (ELeave) CMainWindow(this);
        iMainWindow->ConstructL(iRect);
        iWindow1  = new (ELeave) CNumberedWindow (this);
        iWindow1->ConstructL (TRect (TPoint (100, 100), TSize (100, 100)), TRgb (100, 100, 100),
                iMainWindow);
        }


/****************************************************************************\
|       Function:       CExampleWsClient::RunL()
|                               Called by active scheduler when an even occurs
|       Purpose:        Processes events according to their type
|                               For key events: calls HandleKeyEventL() (global to client)
|                               For pointer event: calls HandlePointerEvent() for window
|                                  event occurred in.
\****************************************************************************/
void CExampleWsClient::RunL()
        {
        // get the event
        iWs.GetEvent(iWsEvent);
        TInt eventType=iWsEvent.Type();
        // take action on it
        switch (eventType)
                {
        // events global within window group
        case EEventNull:
                break;
        case EEventKey:
                {
                TKeyEvent& keyEvent=*iWsEvent.Key(); // get key event
                HandleKeyEventL (keyEvent);
                break;
                }
        case EEventKeyUp:
        case EEventModifiersChanged:
        case EEventKeyDown:
        case EEventFocusLost:
        case EEventFocusGained:
        case EEventSwitchOn:
        case EEventPassword:
        case EEventWindowGroupsChanged:
        case EEventErrorMessage:
                break;
        // events local to specific windows
        case EEventPointer:
                {
                CWindow* window=(CWindow*)(iWsEvent.Handle()); // get window
                TPointerEvent& pointerEvent=*iWsEvent.Pointer();
                window->HandlePointerEvent (pointerEvent);
                break;
                }
        case EEventPointerExit:
        case EEventPointerEnter:
        case EEventPointerBufferReady:
                {
                CWindow* window=(CWindow*)(iWsEvent.Handle()); // get window
                window->HandlePointerMoveBufferReady ();
                break;
                }
        case EEventDragDrop:
                break;
        default:
                break;
                }
        IssueRequest(); // maintain outstanding request
        }

/****************************************************************************\
|       Function:       CExampleWsClient::HandleKeyEventL()
|       Purpose:        Processes key events for CExampleWsClient
\****************************************************************************/
void CExampleWsClient::HandleKeyEventL (TKeyEvent& /*aKeyEvent*/)
        {
        }

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