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July 2006

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cool_li | 20 July, 2006 10:44

The timelnie in puzzle games, lifetime in fighting games, that is a very normol element.
The following article will tell you how to make a timeline control step by step in S60.

Author Website: http://www.symbianer.com

The keywords of artile: window, custom control, time, periodic.

Frist, you need reffer to tow articles
I.Symbian OS: Creating Custom Controls
you can download here>>

II.Periodic timer active object.
Developer Library >> API Reference >> C++ API reference >> Timers and Timing Services >> CPeriodic

1. Class Declaration:

Code:

class CMyTimerContainer : public CCoeControl
{
public:

    void ConstructL(TInt aSecond ,TPoint aPoint, TSize aSize); // Initialize Seconds, Position, Size Of Timeline Control
    ~CMyTimerContainer();
    void Draw(const TRect& aRect) const;

    static TInt Start__(TAny* aObject);
    void Start_();
private: //data

CPeriodic* iPeriodic;
TInt iLeft; //Left times
TInt iTotal;//Total times
TPoint iPoint; //control position,
TSize iSize; //Control size
}

2. Periodic Functions:

Code:

TInt CMyTimerContainer::Start__(TAny* aObject)
{
((CMyTimerContainer*)aObject)->Start_(); // cast, and call non-static function
    return 1;
}

void CMyTimerContainer::Start_()
{
iLeft--;
if(iLeft==0)
{
    DrawNow();
    iPeriodic->Cancel();
    return;
}
DrawNow();
}

3. Draw Funciton
Code:

void CMyTimerContainer::Draw(const TRect& aRect) const
    {
    CWindowGc& gc = SystemGc();

    /*Draw BackGround*************************/
    gc.SetBrushColor( KRgbBlack );
    gc.SetBrushStyle( CGraphicsContext::ESolidBrush );
    gc.DrawRect(aRect);

    /*Drar Timeline*************************/
     gc.SetBrushStyle( CGraphicsContext::ESolidBrush );
     gc.SetBrushColor( KRgbRed );
     gc.SetPenStyle( CGraphicsContext::ENullPen );
     gc.DrawRect( TRect(TSize(iLeft*Size().iWidth/iTotal,iSize.iHeight)) );
    }

4. Construct Function

Code:

void CMyTimerContainer::ConstructL(TInt aSecond ,TPoint aPoint, TSize aSize)
    {
    CreateWindowL();
    iTotal = aSecond;
    iLeft = iTotal;
    iPoint = aPoint;
    iSize = aSize;
    iPeriodic = CPeriodic::NewL(CActive::EPriorityIdle);
    iPeriodic->Start(0/*8000000*/, 1000000/*35714*/, TCallBack(Start__, this));
    SetExtent(aPoint,aSize);
    ActivateL();
    }

5. How To Use The Timeline Custom Control

Code:

a.Add Custom Control in XXXContainer.h
   private: //data
     CMyTimerContainer* iTimer;

b,Initialize Seconds, Position, Size Of Timeline Control
void CXXXXContainer::ConstructL(const TRect& aRect)
    {
    CreateWindowL();

    iTimer = new (ELeave) CMyTimerContainer;
    iTimer->ConstructL( 60/*init seconds*/,TPoint(0,100),TSize(176,15),this);

    SetRect(aRect);
    ActivateL();
    }