Enabling +additional touch events for your application

By default, the Symbian platform sends only EButton1Up and EButton1Down touch +events to applications.

If you want to enable EDrag touch events, implement CCoeControl::EnableDragEvents() in +your container class.

When the mobile device user drags the stylus on the screen, TPointerEvent::EDrag() events +are sent. When dragging stops, the application receives the event TPointerEvent::EButton1Up().

+void CTableauControl::ConstructL( const TRect& aRect ) + { + // This is parent window + CreateWindowL(); + + EnableDragEvents(); + + //SetRect( aRect ); + SetExtentToWholeScreen(); + + + // Initialize component array + InitComponentArrayL(); + + + //Implement your own logic here + ActivateL(); + } +

It is enough that the container control set EnableDragEvents() in +its construction. EnableDragEvents() need not be set again +for the child controls to receive dragging events.

Controlling +which control receives a touch event

Particularly when you are receiving +drag events it may be that an object in the window may be drawn by one control, +while the pointer is over another control. In cases where you want to ensure +that pointer events are received by the intended control, implement CCoeControl::SetPointerCapture().

When +a control receives a TPointerEvent::EButton1Down() event, +all events will be sent to this control until the next TPointerEvent::EButton1Up() event. +If you want to have events to be sent to another control before the TPointerEvent::EButton1Up() event, +call SetPointerCapture(ETrue) from the new control.

When +the new control has received its pointer event and TPointerEvent::EButton1Up() has +been received, you have to call SetPointerCapture(EFalse) from +the new control to stop events being sent to it indefinitely.

Specifying +screen areas for touch events

To specify screen areas (TRect) +for touch events, see the example below.

void CTableauControl::HandlePointerEventL(const TPointerEvent& aPointerEvent) + { + // Does the user point exit text on screen? + // iExitRect is rectangle of the text area on screen. + if (iExitRect.Contains(aPointerEvent.iPosition)) + { + if (iEikonEnv->QueryWinL(_L("Klondike"),_L("Exit?"))) + { + // Exit was pointed, then do exit + (static_cast<CKlondikeAppUi*>(iEikonEnv->AppUi()))->HandleCommandL(EEikCmdExit); + return; + } + } + ... + }

Ignoring events +other than pointer up in your control

In cases where you want to +make sure your control receives only touch EButton1Up events +after receiving a touch EButton1Down event, implement CCoeControl::IgnoreEventsUntilNextPointerUp().