Custom Callback with Button

Suresh · April 4, 2023 at 3:23 PM

Hi,

The goal is to create a button with Multi strings where the strings have different fonts from each other, So as suggested by emwin documentation I have created a custom callback function but I observe that the custom callback is overwriting all the previous set properties. The codes are as follows

Code

hButton = WM_GetDialogItem(pMsg->hWin, ID_BUTTON1);
WM_SetCallback(hButton , CallBack_Button);


hButton = WM_GetDialogItem(pMsg->hWin, ID_BUTTON1);
BUTTON_SetBkColor(hButton, BUTTON_CI_UNPRESSED, SKY_BLUE);
BUTTON_SetBkColor(hButton, BUTTON_CI_PRESSED, HEADER_OFFWHITE);
BUTTON_SetTextColor(hButton, BUTTON_CI_PRESSED, BASE_BLUE);
BUTTON_SetTextColor(hButton, BUTTON_CI_UNPRESSED, BASE_BLUE);

the callback function

Code

void CallBack_Button(WM_MESSAGE * pMsg) {
  GUI_RECT Rect;
  int      Index;
  int      TextAlign;


  switch (pMsg->MsgId) {
  case WM_PAINT:




	 WM_GetClientRect(&Rect);


	  if(BUTTON_IsPressed(pMsg->hWin)) {
		  GUI_SetBkColor(HEADER_OFFWHITE);
		  GUI_SetColor(BASE_BLUE);


	  } else {
		  GUI_SetBkColor(BASE_BLUE);
		  GUI_SetColor(SKY_BLUE);
	  }
	  GUI_SetFont(&GUI_Fontsymbols_Regular_36);
	  GUI_DispCharAt('&',Rect.x0 + 10,Rect.y0 + 10);


	  GUI_SetFont(&GUI_Font_UI_Tab_Bold_22);
	  GUI_DispStringAt("Stop",Rect.x0 + 40,Rect.y0 + 10);
    break;
  default:
    BUTTON_Callback(pMsg);
    break;
  }
}

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the result would be that
the entire OFF_WHITE background is replaced by white color except for the two strings. Is there any method where the button_<routines> can be used along with custom modifications.

Thanks

SEGGER - Schoenen · April 5, 2023 at 2:33 PM

Hi,

With the default skin of the BUTTON widget the functions BUTTON_SetBkColor() and BUTTON_SetTextColor() are not working. Either set the classic skin or use SKINFLEX properties to change properties like colors.

If you overwrite the callback function of a widget you can call the default callback function (e.g BUTTON_Callback()) and then draw something.

Here is a brief example how this could be done:

C

#include "DIALOG.h"


/*********************************************************************
*
*       Static code
*
**********************************************************************
*/
/*********************************************************************
*
*       _cbButton
*/
static void _cbButton(WM_MESSAGE * pMsg) {
  GUI_RECT Rect;


  switch(pMsg->MsgId) {
  case WM_PAINT:
    BUTTON_Callback(pMsg);
    WM_GetClientRect(&Rect);
	  if(BUTTON_IsPressed(pMsg->hWin)) {
		  GUI_SetBkColor(GUI_WHITE);
		  GUI_SetColor(GUI_BLUE);
	  } else {
		  GUI_SetBkColor(GUI_BLUE);
		  GUI_SetColor(GUI_LIGHTBLUE);
	  }
	  GUI_SetFont(&GUI_Font13_1);
	  GUI_DispCharAt('&',Rect.x0 + 10,Rect.y0 + 10);
	  GUI_SetFont(&GUI_Font13B_1);
	  GUI_DispStringAt("Stop",Rect.x0 + 40,Rect.y0 + 10);
    break;
  default:
    BUTTON_Callback(pMsg);
  }
}


/*********************************************************************
*
*       _cbBk
*/
static void _cbBk(WM_MESSAGE * pMsg) {
  switch (pMsg->MsgId) {
  case WM_PAINT:
    GUI_SetBkColor(GUI_BLACK);
    GUI_Clear();
    break;
  default:
    WM_DefaultProc(pMsg);
    break;
  }
}


/*********************************************************************
*
*       Public code
*
**********************************************************************
*/
/*********************************************************************
*
*       MainTask
*/
void MainTask(void) {
  BUTTON_Handle hButton;


  GUI_Init();
  WM_MULTIBUF_Enable(1);
  WM_SetCallback(WM_HBKWIN, _cbBk);
  hButton = BUTTON_CreateEx(10, 10, 100, 30, WM_HBKWIN, WM_CF_SHOW | WM_CF_HASTRANS, 0, GUI_ID_BUTTON0);
  WM_SetCallback(hButton, _cbButton);
  BUTTON_SetSkinClassic(hButton);
  BUTTON_SetBkColor(hButton, BUTTON_CI_UNPRESSED, GUI_LIGHTBLUE);
  BUTTON_SetBkColor(hButton, BUTTON_CI_PRESSED, GUI_WHITE);
  BUTTON_SetTextColor(hButton, BUTTON_CI_PRESSED, GUI_BLUE);
  BUTTON_SetTextColor(hButton, BUTTON_CI_UNPRESSED, GUI_BLUE);
  while (1) {
    GUI_Delay(100);
  }
}


/*************************** End of file ****************************/

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Best regards,
Sven

Suresh · April 6, 2023 at 12:00 PM

Dear Sven,

Thank you for the input. worked very well.

Regards
Suresh

Custom Callback with Button

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