React on messages (Sample)

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

This sample demonstrates how the application can react on messages sent by widgets or windows.

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_ReactOnMessages.c
Purpose     : Sample that shows how to react on different messages
              from widgets.
Requirements: WindowManager - (x)
              MemoryDevices - ( )
              AntiAliasing  - ( )
              VNC-Server    - ( )
              PNG-Library   - ( )
              TrueTypeFonts - ( )
---------------------------END-OF-HEADER------------------------------
*/

#include "DIALOG.h"

/*********************************************************************
*
*       Defines
*
**********************************************************************
*/
#define BUTTON_SIZE 50

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

/*********************************************************************
*
*       _cbWin
*/
static void _cbWin(WM_MESSAGE * pMsg) {
  WM_HWIN    hButton;
  int        Id;
  int        NCode;
  static int Clicked;

  switch (pMsg->MsgId) {
  case WM_CREATE:
    Clicked = -1;
    //
    // Create a button
    //
    hButton = BUTTON_CreateEx(10, 10, BUTTON_SIZE, BUTTON_SIZE, pMsg->hWin, WM_CF_SHOW, 0, GUI_ID_BUTTON0);
    break;
  case WM_PAINT:
    GUI_SetBkColor(GUI_WHITE);
    GUI_Clear();

    GUI_SetColor(GUI_BLACK);
    if (Clicked == 1) {
      GUI_DispStringAt("The button has been clicked.", 10, 70);
    } else if (Clicked == 0) {
      GUI_DispStringAt("The button has been released.", 10, 70);
    }
    break;
  case WM_NOTIFY_PARENT:          // Catches notifications of all widgets within this window
    Id = WM_GetId(pMsg->hWinSrc); // Get ID of source window that sent the message (button)
    NCode = pMsg->Data.v;         // Data.v contains the notification code
    switch (Id) {
    case GUI_ID_BUTTON0:
      switch (NCode) {
      case WM_NOTIFICATION_CLICKED: // When the widget has been touched
        Clicked = 1;
        WM_InvalidateWindow(pMsg->hWin);
        break;
      case WM_NOTIFICATION_RELEASED: // When the widget has been released
        Clicked = 0;
        WM_InvalidateWindow(pMsg->hWin);
        break;
      }
      break;
    }
    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 ****************************/