SLIDER - Usage (Sample)

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

This sample demonstrates the usage of a SLIDER widget.

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        : SLIDER_Usage.c
Purpose     : Sample that demonstrates the usage of a SLIDER widget
              in emWin.
Requirements: WindowManager - (x)
              MemoryDevices - ( )
              AntiAliasing  - ( )
              VNC-Server    - ( )
              PNG-Library   - ( )
              TrueTypeFonts - ( )
---------------------------END-OF-HEADER------------------------------
*/

#include "DIALOG.h"
#include <stdio.h>

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

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

/*********************************************************************
*
*       Static code
*
**********************************************************************
*/
static void _cbWin(WM_MESSAGE * pMsg) {
  static WM_HWIN hSlider;
  int            NCode, Id;
  int            Value;
  char           acBuffer[32];

  switch(pMsg->MsgId) {
  case WM_CREATE:
    //
    // Create horizonzal slider. A vertical slider can be created with SLIDER_CF_VERTICAL instead.
    //
    hSlider = SLIDER_CreateEx(10, 10, 150, 30, pMsg->hWin, WM_CF_SHOW, SLIDER_CF_HORIZONTAL, GUI_ID_SLIDER0);
    //
    // Set range of slider
    //
    SLIDER_SetRange(hSlider, 0, 100);
    //
    // Set number of tick marks
    //
    SLIDER_SetNumTicks(hSlider, 10);
    //
    // Set value of slider
    //
    SLIDER_SetValue(hSlider, 20);
    //
    // Set width of thumb
    //
    SLIDER_SetWidth(hSlider, 20);
    break;
  case WM_PAINT:
    GUI_SetBkColor(GUI_WHITE);
    GUI_Clear();
    GUI_SetFont(&GUI_Font13B_1);
    GUI_SetColor(GUI_BLACK);
    //
    // Display slider value
    //
    Value = SLIDER_GetValue(hSlider);
    sprintf(acBuffer, "Value: %d", Value);
    GUI_DispStringAt(acBuffer, 10, 50);
    break;
  case WM_NOTIFY_PARENT:
    Id    = WM_GetId(pMsg->hWinSrc);
    NCode = pMsg->Data.v;
    switch(Id) {
    case GUI_ID_SLIDER0:
      switch(NCode) {
      case WM_NOTIFICATION_VALUE_CHANGED:
        //
        // Redraw the window when a value has changed so the displayed value will be updated.
        //
        WM_InvalidateWindow(pMsg->hWin);
        break;
      }
      break;
    }
    break;
  default:
    WM_DefaultProc(pMsg);
  }
}

/*********************************************************************
*
*       Public code
*
**********************************************************************
*/
/*********************************************************************
*
*       MainTask
*/
void MainTask(void) {
  //
  // Init emWin.
  //
  GUI_Init();
  WM_MULTIBUF_Enable(1);
  //
  // Create parent window.
  //
  WM_CreateWindowAsChild(0, 0, LCD_GetXSize(), LCD_GetYSize(), WM_HBKWIN, WM_CF_SHOW, _cbWin, 0);

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

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