Dynamically add check boxes to panel

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I have a Windows Form with a panel on it that I would like to add check boxes too. However, when the form starts, it does not know how many check boxes it will need or what their text will be.

I have a function in another class that returns an array of Strings. The number of Strings in the array will be the number of check boxes I need. When a new check box is added it goes directly below the one before it (the first one just goes at the top left of the panel).

So it should look something like:

for(int i = 0; i < array.length; i++)
{
   // new checkbox with id checkBox + i.ToString()
   // checkBoxi.text = array[i]
   // add checkBoxi to panel below the one before it
}

I'm not really sure how to actually implement this, so any advice would be great.

My other idea is just to hide about 15 checkboxes (there will never be more than 15) when the form loads, and show as many as necessary when the array is returned, but I'd rather do it the way I've described above.

This is in Visual C++ 2008 Express Edition.

Thanks in advance!

Posted 1-Jul-11 9:59am

obp42

Updated 1-Jul-11 10:37am

v2

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Comments

Philippe Mori 1-Jul-11 16:30pm

For a small number of checkboxes, hiding them would be the easier way to do it (assuming you are using MFC or the Windows API). Typically, you could uses consecutive IDs so a simple loop would allows to show or hide checkboxes.

In the text above you are talking of Windows Forms and a panel. Are you using WinForms or MFC or the Windows API. In Winforms, you could uses CheckedListBox in that case. By the way, it is much simpler to dynamicaly add controls in WinForms as a flow layout panel could be used.

2 solutions

Solution 2

I developed thing like this before
it can be done

C#

static unsigned int idc_CehckBoxButtonStart,idc_CehckBoxButtonEnd; // to remember the start and end of the ids of your button arrray.
switch(msg)
{
case WM_CREATE:
  ...
 Array=GetTheArray(); //your function that will give you the text array list
 idc_CehckBoxButtonStart=IDC_CHECKBOX_START_NUMBER;
 idc_CehckBoxButtonEnd=idc_CehckBoxButtonStart;
 for(i=0;i<arraycount;i++)>
 {
      CreateWindowEx(0,L"BUTTON",Array.cText,WS_CHILD|WS_VISIBLE|WS_TABSTOP|BS_RADIOBUTTON|WS_GROUP,STATIC_WIDTH+10,top,115,ALL_HEIGHT,hWnd,(HMENU)idc_CehckBoxButtonEnd,ghInstance,NULL); //it is for radiobutton
  idc_CehckBoxButtonEnd++;
 }
break;
case WM_COMMAND:
{
wmId    = LOWORD(wParam);
        wmEvent = HIWORD(wParam);
   if(wmId>=idc_CehckBoxButtonStart && wmId<idc_cehckboxbuttonend)>
   {
     //do your magic.
     break;
   }
   //rest of command process 

}

Posted 3-Jul-11 22:01pm

Mohibur Rashid

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Albert Holguin · Accepted Answer · 2011-07-01T10:11:00

A checkbox is just a CButton with certain button styles, to create dynamically, just do this:

//pseudo-code
//Initialize container, could be linked list, or CArray, or array, or vector to contain all of the CButton pointers
for(...){
 CheckboxContainer[i] = new CButton;
 CheckboxContainer[i]->Create("Text", BS_CHECKBOX | WS_VISIBLE | BS_TEXT, 
   rect, parentWnd, nID); //Just remember to keep track of the location and update after each iteration to space out the containing rects, for the IDs, you can allocate a block of resource IDs
}

Button styles:
http://msdn.microsoft.com/en-us/library/tf9hd91s%28VS.80%29.aspx[^]

CButton::Create() description:
http://msdn.microsoft.com/en-us/library/bw4e0cww%28v=vs.80%29.aspx[^]