WideStudio/MWT Programming Guide	WideStudio/MWT Index Table of contents

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The sample of the event procedures for WSCvifield

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Executing some event procedures by return key

You can execute the specified procedures in the event procedure. Here, the following sample shows executing the procedure which name is "InputFixed".

//A sample of WSEV_KEY_HOOK trigger.
#include "WSDkeyboard.h"
void cbop(WSCbase* object){
  (A)Get the pressed key.
  long key = WSGIappKeyboard()->getKey();
  (B)If the key is return..
  if (key == WSK_Return){
    //Execute the procedure which name is "InputFixed".
    object->execProcedure("InputFixed");
  }
}

• (A): Get the key code which is pressed from the keyboard.
  
  
• (B): if it is return key, do (C).
  
  
• (C): Execute the procedure which name is "InputFixed".

This procedure sometimes is used to execute some procedure on the end of key input.

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Clearing the last input string on starting of next input

Here, you create a procedure which clears the last input string on starting of the next. the procedure clears the string the first key input since the input field instance is focused or clicked by the mouse pointer. The clear process is as follows:

• (1)It sets the clear flag True,if the input field is focused.
  
  
• (2)It sets the clear flag True,if the input field is clicked.
  
  
• (3)It clears the string if the clear flag is True.
  
  
• (4)It initializes the sub-procedures (1),(2),(3).

#include <WSDkeyboard.h>
//To contain the last focused input field.
static WSCbase* _focus_if = NULL;
//(1)A sub-procedure with WSEV_FOCUS_CH
static void _focus_on_(WSCbase* object){
  //(A) Examine whether the instance is focused.
  if (_focus_if != object && object->getFocus() != False){ 
    //(B)It need to clear the string!
    //Set the clear flag True.
    object->setUserData("CLEAR TIMING",(void*)1);
    //(C)store that the last focused one is.
    _focus_if = object;
  }
}
//(2)A sub-procedure with WSEV_MOUSE_PRESS
static void _btn_press_(WSCbase* object){
  //(D) if clicked by the mouse pointer,
  // it needs to clear the string!
  //  Set the clear flag True.
  object->setUserData("CLEAR TIMING",(void*)1);
  object->setProperty(WSNcursorPos,0);
  //(E)store that the last focused one is.
  _focus_if = object;
}
//(3)A sub-procedure with WSEV_KEY_PRESS
static void _key_hook_(WSCbase* object){
  //(F) See the clear flag to clear the last input string.
  long fl =(long)object->getUserData("CLEAR TIMING");
  if (fl == 1){
    long key = WSGIappKeyboard()->getKey();
    //(G) Clear the string,if the key is not cursor key.
    if (key != WSK_Tab &&
        key != WSK_Up &&
        key != WSK_Down &&
        key != WSK_Left &&
        key != WSK_Right ){
      //(H)Clear...
      object->setProperty(WSNlabelString,"");
    }else{
      return;
    }
  }
  //(I)Set the clear flag False.
  object->setUserData("CLEAR TIMING",(void*)0);
}

//The main-procedure.
//(4)Set the input field instance with WSEV_INITIALIZE trigger.
void ifdclr(WSCbase* object){
  //Setup the sub-procedure(1) with WSEV_FOCUS_CH
  WSCprocedure* ac1 = new WSCprocedure("ac1",WSEV_FOCUS_CH);
  ac1->setFunction(_focus_ch_,"_focus_ch_");
  object->addProcedure(ac1);

  //Setup the sub-procedure(2) with WSEV_MOUSE_PRESS
  WSCprocedure* ac2 = new WSCprocedure("ac2",WSEV_MOUSE_PRESS);
  ac2->setFunction(_btn_press_,"_btn_press_");
  object->addProcedure(ac2);

  //Setup the sub-procedure(3) with WSEV_KEY_PRESS
  WSCprocedure* ac3 = new WSCprocedure("ac3",WSEV_KEY_HOOK);
  ac3->setFunction(_key_hook_,"_key_hook_");
  object->addProcedure(ac3);
}

In the focus_ch event procedure, To examine the instance is focused afresh, It uses the static variable which is stored the last focused instance.

• (A): It checks whether the instance is equal to the last focused one. if it differs and it focused (not lost), it means that the instance is focused afresh.
  
  
• (B): It sets the clear flag True.
  
  
• (C): It stores the instance to the static variable for the next.
  
  
• (D): It sets the clear flag True and move the cursor to the top.
  
  
• (E): It stores the instance to the static variable for the next.
  
  
• (F): It sees the clear flag to clear the last string.
  
  
• (G): It is too sad to clear the string with the cursor key, so it sees what it is.
  
  
• (H): It clears the string if it is not.
  
  
• (I): It sets the clear flag False.