Maximize width of GuiCtrlCreateCombo when open

[Jdavis]

I wasn't able to find in way of a solution for this, but was hoping someone could point me in the right direction.

Is it possible to have the opened list of items in a Combo control maximized to be able to show the longest item in the view when the Combo control itself has a width that is shorter?

For example, if you were to create your control with...

$myComboBox= GUICtrlCreateCombo( "This a really long item in my combo box that is much wider than the width of the combo box", 0, 0, 50, 0 )

In my understanding, when you open this combo box it won't display this entire item, but instead the opened view will only have the same width as the width of the control and any items in the opened view will simply just be cut-off when they exceed that width.

I was hoping there'd be a way that when a combo control is opened that the open view could be made to be as wide as the longest item in the list.

[smashly]

Hi,

#include <GUIConstantsEx.au3>
#Include <GuiComboBox.au3>
Opt('MustDeclareVars', 1)

Example()

Func Example()
    Local $msg, $Combo
    GUICreate("My GUI combo")  ; will create a dialog box that when displayed is centered

    $Combo = GUICtrlCreateCombo("This a really long item in my combo box that is much wider than the width of the combo box", 10, 10) ; create first item
    ConsoleWrite(_GUICtrlComboBox_GetLBTextLen($Combo, 0) & @LF)
    _GUICtrlComboBox_SetDroppedWidth($Combo, _GUICtrlComboBox_GetLBTextLen($Combo, 0) * 4.8)
    GUISetState()

    ; Run the GUI until the dialog is closed
    While 1
        $msg = GUIGetMsg()
        
        If $msg = $GUI_EVENT_CLOSE Then ExitLoop
    WEnd
EndFunc

Cheers

[Jdavis]

Thanks! That sure works well. After a bit of googling, I stumbled on to this page for undering those various functions:

http://msdn.microsoft.com/en-us/library/a66b856s(VS.80).aspx

I was curious, though, why the 4.8? Does this in some way to relate to the width of a pixel? I only ask because I was trying to think of a way to always have the width of the open list always be just large enough to accomodate the biggest string. So, in my particular case, I was doing something to the effect of:

For $i = 1 To UBound( $inputFromINI ) - 1
        GUICtrlSetData( $myComboBox, $inputFromINI[$i] )
    If StringLen( $inputFromINI[$i] ) > $longestString Then 
            $longestString = $inputFromINI[$i]
            $longestStringIndex = $i
    EndIf
Next
    
_GUICtrlComboBox_SetDroppedWidth( $myComboBox, _GUICtrlComboBox_GetLBTextLen( $myComboBox, $longestStringIndex ) )

However, this doesn't give the desired result. I imagine there's something I'm not quite grasping about how those functions are intended to work?

Edited January 20, 2009 by Jdavis

[smashly]

Thanks! That sure works well. After a bit of googling, I stumbled on to this page for undering those various functions:

http://msdn.microsoft.com/en-us/library/a66b856s(VS.80).aspx

I was curious, though, why the 4.8? Does this in some way to relate to the width of a pixel? I only ask because I was trying to think of a way to always have the width of the open list always be just large enough to accomodate the biggest string. So, in my particular case, I was doing something to the effect of:

For $i = 1 To UBound( $inputFromINI ) - 1
        GUICtrlSetData( $myComboBox, $inputFromINI[$i] )
    If StringLen( $inputFromINI[$i] ) > $longestString Then 
            $longestString = $inputFromINI[$i]
            $longestStringIndex = $i
    EndIf
Next
    
_GUICtrlComboBox_SetDroppedWidth( $myComboBox, _GUICtrlComboBox_GetLBTextLen( $myComboBox, $longestStringIndex ) )

However, this doesn't give the desired result. I imagine there's something I'm not quite grasping about how those functions are intended to work?

Your welcome,

_GUICtrlComboBox_GetLBTextLen() function returns the number characters in the string.

I just did a crude calculation of 4.8 pixels for a characters width.

But the _GUICtrlComboBox_SetDroppedWidth() function works with pixels.

You could use different ways to get the true length of pixels of the longest string.

_WinAPI_GetTextExtentPoint32() function can return the length a string in pixels.

Also there are some GDI+ functions that can calculate the length of a string in pixels based of the the text attributes, eg: font type, font size, weight, font attributes (italic, bold, underline, strike)

Cheers

[kjcdude]

Function that should work.

_maxcomboboxdrop($COMBOBOXNAME)

Func _maxcomboboxdrop($box1)
    $cl2 = 0
    $list2 = _GUICtrlComboBox_GetListArray($box1)
    for $t = 1 to $list2[0]
        $l2 = _GUICtrlComboBox_GetLBTextLen($box1, $t)
        if $l2 > $cl2 Then
            $cl2 = $l2
        EndIf
    Next
    _GUICtrlComboBox_SetDroppedWidth($box1, $cl2 * 5.8)
EndFunc