[IronPython] focus and selecting text in a TextBox with IronPython

[Michael Foord]

On 25/03/2010 19:59, Ken MacDonald wrote:
> Hi Michael,
> I have a (WPF) TextBox on a popup window. The textbox is supposed to 
> allow the user to enter a guest's name before clicking one of the 
> buttons on the popup. When the popup first appears, I want to have 
> some dummy text in the textbox indicating that they should put in a 
> name, e.g. "<Enter Name Here>". When the user clicks into the textbox, 
> I want to select/highlight all of the text in the textbox, and set the 
> text-caret at the end, so that typing anything will cause the dummy 
> text to disappear and leave, say, "fred". This is a behavior I've seen 
> on hundreds of applications, websites, etc. but it doesn't seem to 
> want to play with ipy.

Well, it certainly won't be a problem with IronPython. Actually in my 
experience the more common behaviour is that the pre-existing text 
disappears on focus not when you start typing.

I do see the same behavior as you - although I see the selection 'flash' 
when the method is executed. The code is being executed, the problem is 
that the standard event handling for the focus event is to unset the 
selection and put the caret at the end of the textbox. Even setting 
'Handled' to true on the GotFocus event doesn't override this default 
behavior.

Why not just clear the textbox on focus instead? If the textbox is still 
empty on LostFocus you can restore the dummy text.

Michael


> Thanks,
> Ken
>
> On Thu, Mar 25, 2010 at 3:44 PM, Michael Foord 
> <fuzzyman at voidspace.org.uk <mailto:fuzzyman at voidspace.org.uk>> wrote:
>
>     On 25/03/2010 19:33, Ken MacDonald wrote:
>>     On Wed, Mar 24, 2010 at 7:27 PM, Ken MacDonald
>>     <drken567 at gmail.com <mailto:drken567 at gmail.com>> wrote:
>>
>>         Hi,
>>         Using WPF. I'll give the Start/Length a try....
>>         Ken
>>
>>     OK, I tried that in various flavors, still not working. The
>>     selection itself appears to be working; if I un-comment the
>>     "Cut()" at the end, I click into the box and the existing text
>>     disappears. Without the Cut(), if I click into the box, the caret
>>     appears at the end of the existing text, the text is NOT
>>     highlighted (as in Ctrl-A, which works fine), and typing just
>>     appends to the existing text. Any clues appreciated. I've been
>>     trying to get this working for several days now, and everything
>>     I've found seems to indicate this should work.
>
>     Hi Ken,
>
>     Can you repeat your requirements, I'll try to suggest some code.
>
>     Michael
>
>>     Ken
>>
>>             def guest_name_keyboard_focus(self, sender, args):
>>                 print("got focus!")
>>                 textbox = self.control("NewGuestName")
>>                 #textbox.SelectAll()
>>                 textbox.Focus()
>>                 textbox.SelectionStart = 0
>>                 textbox.SelectionLength = len(textbox.Text)
>>
>>                 #textbox.Cut() <=== works if un-commented
>>
>>
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