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DavidR
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Joined: 05 Aug 2003
Posts: 83
Location: Bethel Pennsylvania U.S.A.
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 Posted: Fri Dec 16, 2005 12:05 pm Post subject: Combo Box Edit |
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Greetings,
I'm using a COMBO box to pre-load text from a list but also allow the user to type in their own text. I have a maximum length of 40 characters.
When the user clicks a button to submit the text I warn them if they've typed too many characters.
I would like to have a status display showing the number of available characters remaining while they're typing but can't seem to figure out how to do this without continuously looping. the COMBO control has CLICK and EXIT available but neither of these tells me when the user starts typing.
Is there some reasonable way to do this that I'm overlooking?
Perhaps some way to tell me that this particular box has focus?
Thanks.....
.........David |
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PGWARE
Web Host
Joined: 29 Dec 2001
Posts: 1567
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| Posted: Fri Dec 16, 2005 3:51 pm Post subject: |
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If I recall correctly you can add the CHANGE style to an edit box where it will create a :EDIT1CHANGE event on any changes made within the edit box.
Also you can use the api below to limit the number of characters that can be entered into an editbox:
| Code: | | %A = @sendmsg(@win(~EDIT1),$0C5,40,0) |
Change EDIT1 to your editbox name, and change 40 to the number of characters you want to limit the edit box to. A user will not be able to enter any more text then the limit you set, also it will beep on the computer if they attempt to type more data into the editbox.
You can find more api messages with the api reference manual:
http://www.vdsworld.com/download.php?id=331
Also there are a couple other good api reference files here on vdsworld that are very helpful too.
Last edited by PGWARE on Sat Dec 17, 2005 6:44 pm; edited 3 times in total |
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DavidR
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Joined: 05 Aug 2003
Posts: 83
Location: Bethel Pennsylvania U.S.A.
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| Posted: Fri Dec 16, 2005 4:42 pm Post subject: |
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Thanks, that's exactly what I needed.
It didn't work at first but I took your suggestion and reads the API help file and discovered that the parameter is $0141 for a COMBO box.
Thanks again, we're back in business.
...........David  |
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PGWARE
Web Host
Joined: 29 Dec 2001
Posts: 1567
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| Posted: Sat Dec 17, 2005 6:45 pm Post subject: |
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Oops sorry about that, was a bit early in the morning  You said combobox while I was giving you information for edit boxes.
Good to hear you got it working though, I'm not sure if that CHANGE style will work for a combobox but you can give it a try and see if it does. |
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jwfv
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Joined: 19 Mar 2002
Posts: 422
Location: Beaufort, SC
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| Posted: Mon Mar 27, 2006 2:36 pm Post subject: |
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I just came across this thread when searching for something else and I can't find the CHANGE style for an editbox documented. It doesn't seem to work in VDS5 - is there really such a style?
If not, it would be a great addition to VDS. I think elements need to have as many Styles as possible that generate events. (OnEnter, OnLeave, OnChange), etc.
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Joe Floyd |
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vdsalchemist
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Joined: 23 Oct 2001
Posts: 1448
Location: Florida, USA
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| Posted: Mon Mar 27, 2006 3:44 pm Post subject: |
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jwfv,
There is an EXIT style that you can apply to an edit box. This style fires a ELEMENTNAMEEXIT event when the user tabs away from the edit box.
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jwfv
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Joined: 19 Mar 2002
Posts: 422
Location: Beaufort, SC
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| Posted: Mon Mar 27, 2006 3:49 pm Post subject: |
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Yeah - I use the EXIT style quite a bit to do data formatting, etc. But I had never seen the CHANGE event mentioned, and I don't think it is in VDS. (Would be nice - only fires if the info in the box changes. One could simulate the same thing by checking vs. a variable on an EXIT event, but for a form that has lots of edit fields, it might get complicated.)
I'm just trying to think of a way to show a dialog with lots of edit elements, and then when a certain event happens (close button, "save" button, etc.) - VDS could somehow tell me which have changed.
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vdsalchemist
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Joined: 23 Oct 2001
Posts: 1448
Location: Florida, USA
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| Posted: Mon Mar 27, 2006 4:06 pm Post subject: |
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jwfv,
You could send the edit boxes a EM_GETMODIFY $B8 message.
| Code: | %A = @sendmsg(@winexists(~EDIT1),$B8,0,0)
if @Equal(%A,1)
Warn EDIT1 has changed.
Else
Info Thank you for not changing EDIT1
End
Exit |
I don't think VDS could capture these Notification messages but if so you could hook these messages EN_CHANGE $300 or EN_UPDATE $400.
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jwfv
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Joined: 19 Mar 2002
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Location: Beaufort, SC
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| Posted: Mon Mar 27, 2006 4:37 pm Post subject: |
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Thanks for the tip, but that is a little over my head. And from what you were saying, it sounds like VDS wouldn't capture those windows messages anyway...?
Well, who knows - maybe in the future.
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vdsalchemist
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Joined: 23 Oct 2001
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Location: Florida, USA
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| Posted: Mon Mar 27, 2006 4:48 pm Post subject: |
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| jwfv wrote: | Thanks for the tip, but that is a little over my head. And from what you were saying, it sounds like VDS wouldn't capture those windows messages anyway...?
Well, who knows - maybe in the future. |
Please read my post again.
VDS would only have an issue with the notification messages not the EM_GETMODIFY message.
You wanted to know how to detect if any of your edit boxes changed when your program closed which means you should be able to send each of your editboxes a EM_GETMODIFY message and they should place a 1 or 0 in the variable %A. The number 1 is for true which means the edit box changed. The number 0 means the edit box did not change.
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jwfv
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Joined: 19 Mar 2002
Posts: 422
Location: Beaufort, SC
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| Posted: Mon Mar 27, 2006 4:55 pm Post subject: |
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Wow! That works great!
This could be very helpful because I have lots of data entry/display/verification in my programs, and with a simple routine I can see if anything has changed and needs to be saved, verified, etc.
Thanks for the tip!
Am I understanding you correctly, though - Windows also can send notifications out that say that something has been changed in an edit (as it happens), but VDS lacks the ability to pick up these Windows notifications?
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vdsalchemist
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Joined: 23 Oct 2001
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Location: Florida, USA
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| Posted: Mon Mar 27, 2006 5:43 pm Post subject: |
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| jwfv wrote: | | Am I understanding you correctly, though - Windows also can send notifications out that say that something has been changed in an edit (as it happens), but VDS lacks the ability to pick up these Windows notifications? |
No, VDS handles the Windows notifications like any Win32 GUI application would. I just don't think that the command OPTION MSGEVENT can handle notification messages like the EN_CHANGE $300 or EN_UPDATE $400. I just have not tried it is all 
Here is some more information for you. These notification messages are sent to the editboxes parent window as a WM_COMMAND $111 message. So you would have to point the OPTION MSGEVENT to the WM_COMMAND message. Everytime you got a WM_COMMAND message you would have to get the HIWORD value from the wParam to see if it was EN_CHANGE or EN_UPDATE then look at the lParam to get the Window ID (i.e. window handle) to see if it matches one of your Edit boxes Window ID's. I guess you could use Snarling Sheeps Bitwise VDS 5 functions to get the HIWORD from the wParam take a look at his post... http://forum.vdsworld.com/viewtopic.php?t=1860&highlight=
| Code: | # To get the HIWord of a DWORD number
%%SomeNumber = 12345678
%%Hiword = @SSBitAnd(@SSBitRShift(%%SomeNumber,16) ,@SSHex2Dec($FFFF))
# To get the LOWord of a DWORD number
%%Loword = @SSBitAnd(%%SomeNumber,@SSHex2Dec($FFFF))
#To get the HIByte of a WORD number
%%HIByte = @SSBitAnd(@SSBitRShift(%%Hiword, ,@SSHex2Dec($FF))
#To get the LOByte of a WORD number
%%LOByte = @SSBitAnd(%%Hiword,@SSHex2Dec($FF))
#To make a WORD from 2 BYTE values
%%WORDVal = @SSBitOr(%%LOByte,@SSBitLShift(%%HiByte,)
#To make a DWORD from 2 WORD values
%%DWORDVal = @SSBitOr(%%Loword,@SSBitLShift(%%Hiword,16))
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I though in the Loword Hibyte, Lobyte, MAKEWORD and MAKELONG just for good messure.
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vdsalchemist
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| Posted: Mon Mar 27, 2006 7:21 pm Post subject: |
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jwfv,
I just tried to hook the WM_COMMAND message with OPTION MSGEVENT. Unfortunately OPTION MSGEVENT does not see WM_COMMAND messages  I don't know if VDS has an internal list of Message ID's that it understands or what. I guess you will have to wait for GadgetX to come out. GadgetX can hook WM_COMMAND messages and has the functions needed to handle the wParam's and lParam's properly.
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jwfv
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Joined: 19 Mar 2002
Posts: 422
Location: Beaufort, SC
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| Posted: Mon Mar 27, 2006 7:26 pm Post subject: |
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Cool - anxiously awaiting it.
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Joe Floyd |
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