How connect between WidgetMessageSendPostOrder() and RectangularButtonMsgProc()

key dongle

Hi everyone,

when i surf the code of grlib, there is a place confuzed me.

in the grlib_demo project,

in the function WidgetMessageSendPostOrder(),

//
// Send the message directly to the widget that has captured pointer
// messages.
//
ulRet = g_pPointerWidget->pfnMsgProc(g_pPointerWidget, ulMessage,
ulParam1, ulParam2);

this step would call the function RectangularButtonMsgProc() ,

but i wonder when the pointer g_pPointerWidget->pfnMsgProc had been initialized as RectangularButtonMsgProc().

It really amazed me.

the RectangularButtonMsgProc() was only called by RectangularButtonInit(), I didn't see its caller in current project.

Some strange. It's obviously that I miss something. Could somebody explain that ? Thanks a lot !

BR,

Key

over 7 years ago

0 Lalindra Jayatilleke over 7 years ago

TI__Mastermind 30365 points

Key,

Please see grlib\pushbutton.c for the initialization of the function pointer.

  //
    // Use the rectangular push button message handler to process messages to
    // this push button.
    //
    pWidget->sBase.pfnMsgProc = RectangularButtonMsgProc;

Lali

0 key dongle over 7 years ago in reply to Lalindra Jayatilleke

Intellectual 545 points

Hi Lali,

Thank you for helping me again ！

I had seen the function RectangularButtonInit() that registered the callback function RectangularButtonMsgProc(),

but in the project grlib_demo, didn't find where or when call the function RectangularButtonInit().

Could you give a hint ?

Such as CanvasInit(), CheckBoxInit(),ContainerInit() , the functions initialize graphics components, when the main program call them ?

It seemed concealed.

BR,

Key

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How connect between WidgetMessageSendPostOrder() and RectangularButtonMsgProc()