LISTWHEEL - Custom (Sample)

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

This sample demonstrates custom drawing of a LISTWHEEL 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        : LISTWHEEL_Custom.c
Purpose     : Sample that demonstrates how custom drawing works for
              the LISTWHEEL widget in emWin.
Requirements: WindowManager - (x)
              MemoryDevices - ( )
              AntiAliasing  - ( )
              VNC-Server    - ( )
              PNG-Library   - ( )
              TrueTypeFonts - ( )
---------------------------END-OF-HEADER------------------------------
*/

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

/*********************************************************************
*
*       Defines
*
**********************************************************************
*/
#define LINE_HEIGHT 20
#define Y_SIZE      110

/*********************************************************************
*
*       Static data
*
**********************************************************************
*/
static const char * _acText[] = {
  "Monday",
  "Tuesday",
  "Wednesday",
  "Thursday",
  "Friday",
  "Saturday",
  "Sunday",
  NULL
};

/*********************************************************************
*
*       Static code
*
**********************************************************************
*/
/*********************************************************************
*
*       _OwnerDrawListwheel
*/
static int _OwnerDrawListwheel(const WIDGET_ITEM_DRAW_INFO * pDrawItemInfo) {
  char     acBuffer[32];
  GUI_RECT Rect;

  switch (pDrawItemInfo->Cmd) {
  case WIDGET_ITEM_GET_XSIZE:
    //
    // Return x-size of item
    //
    return LISTWHEEL_OwnerDraw(pDrawItemInfo);
  case WIDGET_ITEM_GET_YSIZE:
    //
    // Return y-size of item
    //
    return LISTWHEEL_OwnerDraw(pDrawItemInfo);
  case WIDGET_ITEM_DRAW:
    //
    // Draw an item
    //
    //
    // Get drawing rect
    //
    Rect.x0 = pDrawItemInfo->x0;
    Rect.x1 = pDrawItemInfo->x1;
    Rect.y0 = pDrawItemInfo->y0;
    Rect.y1 = pDrawItemInfo->y1;
    //
    // Draw selected item in a different color
    //
    if (LISTWHEEL_GetSel(pDrawItemInfo->hWin) == pDrawItemInfo->ItemIndex) {
      GUI_SetColor(GUI_BLUE);
    } else {
      GUI_SetColor(GUI_WHITE);
    }
    //
    // Display item text centered
    //
    GUI_SetTextMode(GUI_TM_TRANS);
    LISTWHEEL_GetItemText(pDrawItemInfo->hWin, pDrawItemInfo->ItemIndex, acBuffer, sizeof(acBuffer));
    GUI_DispStringInRect(acBuffer, &Rect, GUI_TA_CENTER);
    return 0;
  case WIDGET_ITEM_DRAW_BACKGROUND:
    //
    // Draw background
    //
    GUI_DrawGradientV(pDrawItemInfo->x0, pDrawItemInfo->y0, pDrawItemInfo->x1, pDrawItemInfo->y1, GUI_GRAY_7C, GUI_GRAY_AA);
    GUI_SetColor(GUI_BLACK);
    GUI_SetPenSize(2);
    GUI_DrawRect(pDrawItemInfo->x0, pDrawItemInfo->y0, pDrawItemInfo->x1, pDrawItemInfo->y1);
    return 0;
  case WIDGET_ITEM_DRAW_OVERLAY:
    GUI_SetColor(GUI_RED);
    GUI_DrawHLine(pDrawItemInfo->y0 + (LINE_HEIGHT * 2) + 1, pDrawItemInfo->x0, pDrawItemInfo->x1);
    GUI_DrawHLine(pDrawItemInfo->y1 - (LINE_HEIGHT * 2) + 2, pDrawItemInfo->x0, pDrawItemInfo->x1);
    return 0;
  default:
    return LISTWHEEL_OwnerDraw(pDrawItemInfo);
  }
}

/*********************************************************************
*
*       _cbWin
*/
static void _cbWin(WM_MESSAGE * pMsg) {
  int                     NCode;
  int                     Sel;
  char                    acBuffer[64];
  char                    acTemp[32];
  static LISTWHEEL_Handle hListwheel;
  
  switch (pMsg->MsgId) {
  case WM_CREATE:
    //
    // Create listwheel widget
    //
    hListwheel = LISTWHEEL_CreateEx(10, 10, Y_SIZE, 100, pMsg->hWin, WM_CF_SHOW, 0, GUI_ID_LISTWHEEL0, _acText);
    //
    // Set snap position (position where the wheel stops)
    //
    LISTWHEEL_SetSnapPosition(hListwheel, (Y_SIZE - LINE_HEIGHT) / 2);
    //
    // Set some properties about the listwheel
    //
    LISTWHEEL_SetLineHeight(hListwheel, LINE_HEIGHT);
    LISTWHEEL_SetTextAlign(hListwheel, GUI_TA_CENTER);
    //
    // Set OwnerDraw function
    //
    LISTWHEEL_SetOwnerDraw(hListwheel, _OwnerDrawListwheel);
    break;
  case WM_PAINT:
    GUI_SetBkColor(GUI_WHITE);
    GUI_Clear();
    //
    // Draw currently selected day
    //
    GUI_SetColor(GUI_BLACK);
    Sel = LISTWHEEL_GetSel(hListwheel);
    LISTWHEEL_GetItemText(hListwheel, Sel, acTemp, sizeof(acTemp));
    sprintf(acBuffer, "Selected item: %s", acTemp);
    GUI_DispStringAt(acBuffer, 150, 10);
    break;
  case WM_NOTIFY_PARENT:
    NCode = pMsg->Data.v;
    switch (NCode) {
    case WM_NOTIFICATION_SEL_CHANGED:
      //
      // Get current selection
      //
      Sel = LISTWHEEL_GetPos(hListwheel);
      LISTWHEEL_SetSel(hListwheel, Sel);
      break;
    }
    WM_InvalidateWindow(pMsg->hWin);
    break;
  default:
    WM_DefaultProc(pMsg);
    break;
  }
}

/*********************************************************************
*
*       Public code
*
**********************************************************************
*/
/*********************************************************************
*
*       MainTask
*/
void MainTask(void) {
  //
  // Init GUI
  //
  GUI_Init();
  //
  // Enable multi-buffering
  //
  WM_MULTIBUF_Enable(1);
  //
  // Create a window
  //
  WM_CreateWindowAsChild(0, 0, LCD_GetXSize(), LCD_GetYSize(), WM_HBKWIN, WM_CF_SHOW, _cbWin, 0);

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

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