Custom widget callback (Sample)

WIDGET_CustomCallback.c
File(s) required	WIDGET_CustomCallback.c
Runs in simulation	Yes
Runs on target	Yes
Download	WIDGET_CustomCallback.c

This sample demonstrates how a custom callback can be set for a widget. This is shown by setting a callback to a BUTTON widget and overriding its WM_PAINT case.

Code

/*********************************************************************
*                    SEGGER Microcontroller GmbH                     *
*        Solutions for real time microcontroller applications        *
**********************************************************************
*                                                                    *
*        (c) 1996 - 2020  SEGGER Microcontroller GmbH                *
*                                                                    *
*        Internet: www.segger.com    Support:  support@segger.com    *
*                                                                    *
**********************************************************************

** emWin V6.10 - Graphical user interface for embedded applications **
emWin is protected by international copyright laws.   Knowledge of the
source code may not be used to write a similar product.  This file may
only  be used  in accordance  with  a license  and should  not be  re-
distributed in any way. We appreciate your understanding and fairness.
----------------------------------------------------------------------
File        : WIDGET_CustomCallback.c
Purpose     : This sample shows how to give widgets a custom look
              by overwriting the callback routine.
Requirements: WindowManager - (x)
              MemoryDevices - ( )
              AntiAliasing  - ( )
              VNC-Server    - ( )
              PNG-Library   - ( )
              TrueTypeFonts - ( )
---------------------------END-OF-HEADER------------------------------
*/

#include "DIALOG.h"

/*********************************************************************
*
*       Defines
*
**********************************************************************
*/

#define BUTTON_SIZE 50

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

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

  switch (pMsg->MsgId) {
  case WM_PAINT:
    //
    // Draw button
    //
    if (BUTTON_IsPressed(pMsg->hWin)) {
      GUI_SetColor(GUI_LIGHTRED);
    }
    else {
      GUI_SetColor(GUI_GRAY_C8);
    }
    GUI_FillCircle(BUTTON_SIZE / 2, BUTTON_SIZE / 2, BUTTON_SIZE / 2 - 1);
    GUI_SetColor(GUI_BLACK);
    GUI_SetPenSize(2);
    GUI_AA_DrawCircle(BUTTON_SIZE / 2, BUTTON_SIZE / 2, BUTTON_SIZE / 2 - 1);
    GUI_SetPenSize(5);
    GUI_AA_DrawLine(16, 16, 33, 33);
    GUI_AA_DrawLine(33, 16, 16, 33);
    break;
  default:
    BUTTON_Callback(pMsg);
    break;
  }
}

/*********************************************************************
*
*       _cbWin
*/
static void _cbWin(WM_MESSAGE * pMsg) {
  WM_HWIN hButton;

  switch (pMsg->MsgId) {
  case WM_CREATE:
    //
    // Create a button
    //
    hButton = BUTTON_Create(10, 10, BUTTON_SIZE, BUTTON_SIZE, GUI_ID_BUTTON0, WM_CF_SHOW);
    //
    // Set callback routine
    //
    WM_SetCallback(hButton, _cbButton);
    break;
  case WM_PAINT:
    GUI_SetBkColor(GUI_WHITE);
    GUI_Clear();
    break;
  default:
    WM_DefaultProc(pMsg);
    break;
  }
}

/*********************************************************************
*
*       Public code
*
**********************************************************************
*/
/*********************************************************************
*
*       MainTask
*/
void MainTask(void) {
  //
  // Init emWin.
  //
  GUI_Init();
  //
  // Create parent window.
  //
  WM_CreateWindow(0, 0, LCD_GetXSize(), LCD_GetYSize(), WM_CF_SHOW, _cbWin, 0);

  while (1) {
    GUI_Delay(100);
  }
}

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