Overwriting GUIBuilder Window Creation Callback

Haia_Boosa · June 18, 2020 at 1:25 PM

Hello
How Can I overwrite GUIBuilder window creation callback. I want to draw a window with gradient background color.

I tried the following modification on GUIBuilder output, but i did not work.

(Compiler warning is included at the bottom of code)

C: Gradient window

/*********************************************************************
*                                                                    *
*                SEGGER Microcontroller GmbH & Co. KG                *
*        Solutions for real time microcontroller applications        *
*                                                                    *
**********************************************************************
*                                                                    *
* C-file generated by:                                               *
*                                                                    *
*        GUI_Builder for emWin version 5.32                          *
*        Compiled Oct  8 2015, 11:59:02                              *
*        (c) 2015 Segger Microcontroller GmbH & Co. KG               *
*                                                                    *
**********************************************************************
*                                                                    *
*        Internet: www.segger.com  Support: support@segger.com       *
*                                                                    *
**********************************************************************
*/


// USER START (Optionally insert additional includes)
// USER END


#include "DIALOG.h"


/*********************************************************************
*
*       Defines
*
**********************************************************************
*/
#define ID_WINDOW_0 (GUI_ID_USER + 0x00)




// USER START (Optionally insert additional defines)
// USER END


/*********************************************************************
*
*       Static data
*
**********************************************************************
*/


// USER START (Optionally insert additional static data)
static void _cbWin0(WM_MESSAGE * pMsg) {
  GUI_RECT Rect;


  switch (pMsg->MsgId) {
  case WM_PAINT:
	WM_GetClientRect(&Rect);
	GUI_DrawGradientH(Rect.x0, Rect.y0, Rect.x1, Rect.y1, GUI_RED, GUI_BLUE);
	break;
  default:
	WM_DefaultProc(pMsg);
	break;
  }
}
// USER END


/*********************************************************************
*
*       _aDialogCreate
*/
static const GUI_WIDGET_CREATE_INFO _aDialogCreate[] = {
  { WINDOW_CreateIndirect, "Gradient", ID_WINDOW_0, 0, 0, 320, 240, 0, 0x0, _cbWin0 },
  // USER START (Optionally insert additional widgets)
  // USER END
};


/*********************************************************************
*
*       Static code
*
**********************************************************************
*/


// USER START (Optionally insert additional static code)
// USER END


/*********************************************************************
*
*       _cbDialog
*/
static void _cbDialog(WM_MESSAGE * pMsg) {
  // USER START (Optionally insert additional variables)
  // USER END


  switch (pMsg->MsgId) {
  // USER START (Optionally insert additional message handling)
  // USER END
  default:
    WM_DefaultProc(pMsg);
    break;
  }
}


/*********************************************************************
*
*       Public code
*
**********************************************************************
*/
/*********************************************************************
*
*       CreateGradient
*/
WM_HWIN CreateGradient(void);
WM_HWIN CreateGradient(void) {
  WM_HWIN hWin;


  hWin = GUI_CreateDialogBox(_aDialogCreate, GUI_COUNTOF(_aDialogCreate), _cbDialog, WM_HBKWIN, 0, 0);
  return hWin;
}


// USER START (Optionally insert additional public code)
// USER END


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




















//*************************************************


Compiler output:


->Warinigs (1 Item)
	initialization makes integer from pointer without a cast [-Wint-conversion]
->Infos (1 Item)
	(near initialization for '_aDialogCreate[0].NumExtraBytes')
**************************************************/

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Thanks in advance

SEGGER - Florian · June 18, 2020 at 2:34 PM

Hi,

the GUI_WIDGET_CREATE_INFO structure is defined as follows:

C

struct GUI_WIDGET_CREATE_INFO_struct {
      GUI_WIDGET_CREATE_FUNC * pfCreateIndirect;
      const char             * pName;            // Text ... Not used on all widgets
      I16                      Id;               // ID ... should be unique in a dialog
      I16                      x0;               // x position
      I16                      y0;               // y position
      I16                      xSize;            // x size
      I16                      ySize;            // y size
      U16                      Flags;            // Widget specific create flags (opt.)
      I32                      Para;             // Widget specific parameter (opt.)
      U32                      NumExtraBytes;    // Number of extra bytes usable with <WIDGET>_SetUserData & <WIDGET>_GetUserData
    };

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As last parameter you passed a pointer to a callback function, where the number of extra bytes to be allocated should be. So instead of _cbWin, you can just pass 0 as last parameter.
The WINDOW widget in your _aDialogCreate structure is not a separate window widget, it is the dialog. So, to draw a gradient you don't need another callback, you can just copy the WM_PAINT case from _cbWin0 into the _cbDialog callback.

Best regards,

Florian

Haia_Boosa · June 18, 2020 at 3:02 PM

Thanks a lot Florian.

Overwriting GUIBuilder Window Creation Callback

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