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HowTo: Selection in textbox?

 
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Lynn



Joined: 27 Aug 2004
Posts: 89
PostPosted: Thu Dec 23, 2004 6:00 pm    Post subject: HowTo: Selection in textbox? Reply with quote
I'm unclear on how to cause visible selection of a char[] within a multiline viewerTextBox.
I've tried various combinations of the following calls. I'm expecting that the selected text will be either highlighted or reverse video, but the viewerTextBox's appearance doesn't change.

int len = curSearchVerse.length;
int index = find(viewerTextBox.text, curSearchVerse);
viewerTextBox.hideSelection = false;
viewerTextBox.selectionStart = index;
viewerTextBox.selectionLength = len;
viewerTextBox.select(index, len);

Actually, I'm fuzzy on how to cause selection highlighting (reverse video) of a non-multiline TextBox. Nothing happens with the following code:

searchWordsTextBox.text = "1234567890";
searchWordsTextBox.hideSelection = false;
searchWordsTextBox.select(3, 5);
searchWordsTextBox.selectionStart(3);
searchWordsTextBox.selectionLength(5);
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Chris Miller



Joined: 27 Mar 2004
Posts: 514
Location: The Internet
PostPosted: Fri Dec 24, 2004 12:05 am    Post subject: Re: HowTo: Selection in textbox? Reply with quote
Lynn wrote:
I'm unclear on how to cause visible selection of a char[] within a multiline viewerTextBox.

The handle has to be created. Call it's createControl() function or wait until onHandleCreated().
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Lynn



Joined: 27 Aug 2004
Posts: 89
PostPosted: Fri Dec 24, 2004 6:05 am    Post subject: Reply with quote
I'm being slow and don't understand.

In a plain TextBox that is already showing text "1234567890", I don't see how to Select "45678". Doesn't the "handle" already exist? The code I've tried doesn't do anything. Can you provide an example that Selects text in a non-multiline and multiline TextBox?

In a multiline TextBox that is overfilled (scrollbars activated), I want to be able to Select something like (offset=2000, len=200) in a TextBox that contains about 4000 chars, with only 1000 visible. The Selected line should be automagically scrolled into view. With MFC, this is:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_mfc_cedit.3a3a.setsel.asp

In the Win32 Api, this is:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/shellcc/platform/commctls/editcontrols/editcontrolreference/editcontrolmessages/em_setsel.asp

Thanks for your patience with this newbie, and very prompt replies!
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Chris Miller



Joined: 27 Mar 2004
Posts: 514
Location: The Internet
PostPosted: Fri Dec 24, 2004 8:34 am    Post subject: Reply with quote
I see.. when I was making an example I found that setting the selection in some events doesn't work as expected.
For the record,
Code:
selectionStart = pos;
selectionLength = len;

is the same as
Code:
select(pos, len);

and they use EM_SETSEL, so I guess it's a Windows thing. But here's my example that works. I found that setting the selection in a multiline textbox won't scroll to the caret, so I forced it to:
Code:
class MainForm: Form
{
   TextBox single, multi;
   this()
   {
      Button sbtn;
      with(sbtn = new Button)
      {
         text = "&s btn";
         parent = this;
         
         click ~= &sbtn_click;
      }
     
      with(single = new TextBox)
      {
         left = sbtn.right + 4;
         text = "Open Source Development for D Open Source Development for D Open Source Development for D"
            " dsource.org";
         hideSelection = false;
         parent = this;
      }
     
      Button mbtn;
      with(mbtn = new Button)
      {
         top = 40;
         text = "&m btn";
         parent = this;
         
         click ~= &mbtn_click;
      }
     
      with(multi = new TextBox)
      {
         text = "Open Source Development for D\r\nOpen Source Development for D\r\nOpen Source Development for D"
            "\r\nOpen Source Development for D\r\nOpen Source Development for D\r\nOpen Source Development for D"
            " dsource.org";
         hideSelection = false;
         bounds = Rect(mbtn.right + 4, mbtn.top, 200, 60);
         multiline = true;
         acceptsReturn = true;
         parent = this;
      }
   }
   private void sbtn_click(Object sender, EventArgs ea)
   {
      int epos;
      epos = std.string.rfind(single.text, 'e');
      if(epos != -1)
      {
         single.select(epos, 1);
      }
   }
   private void mbtn_click(Object sender, EventArgs ea)
   {
      int epos;
      epos = std.string.rfind(multi.text, 'e');
      if(epos != -1)
      {
         multi.select(epos, 1);
         multi.scrollToCaret();
      }
   }
}
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Lynn



Joined: 27 Aug 2004
Posts: 89
PostPosted: Mon Dec 27, 2004 7:26 pm    Post subject: Reply with quote
Thanks MUCHO for the example.

I tweaked it a bit into a complete program suitable to be a tutorial. Also, the revised code does more than look for the single character 'e' and makes sure that caret scrolling to take place.

Submitted to dfl.tutorial as:
http://dsource.org/tutorials/index.php?show_example=138
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