DROPDOWN - Usage (Sample)

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

This sample demonstrates the usage of a DROPDOWN 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        : DROPDOWN_Usage.c
Purpose     : Sample that demonstrates the usage of DROPDOWN widgets
              in emWin.
Requirements: WindowManager - (x)
              MemoryDevices - ( )
              AntiAliasing  - ( )
              VNC-Server    - ( )
              PNG-Library   - ( )
              TrueTypeFonts - ( )
---------------------------END-OF-HEADER------------------------------
*/

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

/*********************************************************************
*
*       Static data
*
**********************************************************************
*/
/*********************************************************************
*
*       _acContent
*/
static const char * _acContent[] = {
  "English",
  "Deutsch",
  "Espanol",
  "Francais",
  "Italiano",
  "Dansk",
  "Eesti",
  "Hrvatski",
  "Portugues",
  "Suomi"
};

/*********************************************************************
*
*       Static code
*
**********************************************************************
*/
/*********************************************************************
*
*       _cbWin
*/
static void _cbWin(WM_MESSAGE * pMsg) {
  char                   acBuffer[128];
  int                    Sel;
  static DROPDOWN_Handle hDropdown;
  int                    i;
  int                    NCode, Id;
  int                    NumItems;

  switch (pMsg->MsgId) {
  case WM_CREATE:
    //
    // Create listbox widget
    // The flag DROPDOWN_CF_AUTOSCROLLBAR makes sure that a scrollbar is added, if the text is too big
    //
    hDropdown = DROPDOWN_CreateEx(10, 10, 200, 150, pMsg->hWin, WM_CF_SHOW, DROPDOWN_CF_AUTOSCROLLBAR, GUI_ID_DROPDOWN0);
    //
    // Add items to widget
    //
    for (i = 0; i < GUI_COUNTOF(_acContent); i++) {
      DROPDOWN_AddString(hDropdown, *(_acContent + i));
    }
    //
    // Edit some properties
    //
    DROPDOWN_SetFont(hDropdown, &GUI_Font20B_1);
    DROPDOWN_SetItemSpacing(hDropdown, 5);
    DROPDOWN_SetTextColor(hDropdown, DROPDOWN_CI_UNSEL, GUI_LIGHTRED);
    break;
  case WM_PAINT:
    GUI_SetBkColor(GUI_BLACK);
    GUI_Clear();
    GUI_SetFont(&GUI_Font13B_1);
    GUI_SetTextMode(GUI_TM_TRANS);
    //
    // Display current selection
    //
    Sel = DROPDOWN_GetSel(hDropdown);
    sprintf(acBuffer, "Currently selected item (%d): %s", Sel, *(_acContent + Sel));
    GUI_DispStringAt(acBuffer, 250, 10);
    //
    // Display number of items
    //
    NumItems = DROPDOWN_GetNumItems(hDropdown);
    sprintf(acBuffer, "Number of items: %d", NumItems);
    GUI_DispStringAt(acBuffer, 250, 30);
    break;
  case WM_NOTIFY_PARENT:
    //
    // Save ID of sender window and notification code
    //
    Id    = WM_GetId(pMsg->hWinSrc);
    NCode = pMsg->Data.v;
    switch(Id) {
    case GUI_ID_DROPDOWN0:
      switch(NCode) {
      case WM_NOTIFICATION_SEL_CHANGED:
        //
        // Invalidate parent window when a new item has been selected to display the new selection.
        //
        WM_InvalidateWindow(pMsg->hWin);
        break;
      }
      break;
    }
    break;
  default:
    WM_DefaultProc(pMsg);
    break;
  }
}

/*********************************************************************
*
*       Public code
*
**********************************************************************
*/
/*********************************************************************
*
*       MainTask
*/
void MainTask(void) {
  //
  // Init GUI
  //
  GUI_Init();
  //
  // 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 ****************************/