How_to_Handle_Pointer_Events_in_a_Custom_Control（转）

Categories: Symbian C++ | S60 | S60 5th Edition | How To

This page was last modified on 30 September 2009, at 06:05.

ID	...	Creation date	26.10.2008
Platform	S60 5th Edition	Tested on devices	Nokia 5800 XpressMusic.
Category	Symbian C++	Subcategory	Touch UI

Keywords (APIs, classes, methods, functions): HandlePointerEventL(),Custom Control.

Overview

This snippet shows how to handle Pointer events in a custom control and route them to a proper component control by validating the pointer area against the control rect.

This snippet can be self-signed.

Preconditions

Here we assume that we already have a working code for custom control, and we also assume that we have two components: iEdwin1 and iEdwin2 in a custom control.

MMP file

The following capabilities and libraries are required:

CAPABILITY  None
 
LIBRARY cone.lib

#include <COECNTRL.H> 
 
void CCustomContainer::HandlePointerEventL(const TPointerEvent& aPointerEvent)
    {
     // Validate pointer position.
    if( iEdwin1->Rect().Contains( aPointerEvent.iPosition ) )
       {
       // click on edwin1 pass the pointer event. //
       iEdwin1->HandlePointerEventL( aPointerEvent );
       }
    else if( iEdwin2->Rect().Contains( aPointerEvent.iPosition ) )
       {
       // click on edwin2 pass the pointer event. //
       iEdwin2->HandlePointerEventL( aPointerEvent );
       }
    else
       {
       // simply calling the base class implementation //
       CCoeControl::HandlePointerEventL(aPointerEvent);
       }
    }

Postconditions

Pointer position will validated against the control rectangle and the pointer events will be routed to appropriate control.