[Gambas-user] Removing a runtime created control

[Jussi Lahtinen]

See the attachment.

Jussi

On Fri, Nov 27, 2020 at 8:41 PM Jussi Lahtinen <jussi.lahtinen at gmail.com>
wrote:

> I mean Last works inside the event handler, whatever had raised it.
>
> Jussi
>
>
> On Fri, Nov 27, 2020 at 8:39 PM Jussi Lahtinen <jussi.lahtinen at gmail.com>
> wrote:
>
>> At least here you seem to give a new handle:  mTxt[fldNr] = New
>> TextBox(Maske) As "MaskeFeld"
>> The events are raised by the name: My_Button1_Change, My_Button2_Change,
>> etc.
>> If they are grouped you can just use Last (no dot) keyword.
>>
>> Jussi
>>
>>
>> On Fri, Nov 27, 2020 at 5:35 PM Rolf-Werner Eilert <rwe-sse at osnanet.de>
>> wrote:
>>
>>> Interesting, Jussi!
>>>
>>> My version also uses the same handle and event name for each object, and
>>> it finds its events with the .Last property. This was described in some
>>> help text. Maybe it's obsolete meanwhile? I always wondered how it could
>>> work, but I just accepted it as given.
>>>
>>> Your version "New ToolButton(Me) As "My_Button" & CStr(intIndex)" is
>>> much clearer to me, but how would I use .Last in this case? Or: how can
>>> I find just "the object which has produced the Change event (for
>>> example)?
>>>
>>> Rolf
>>>
>>>
>>> Am 27.11.20 um 16:17 schrieb Jussi Lahtinen:
>>> > I'm surprised that works at all, because you are using the same handle
>>> > and the event name for multiple buttons.
>>> >
>>> >    Dim intIndex As Integer[3]
>>> >     For intIndex = 0 To 2
>>> >       hToolButton[intIndex] = New ToolButton(Me) As "My_Button" &
>>> > CStr(intIndex)
>>> > ...
>>> >
>>> > That should behave predictable.
>>> >
>>> > Jussi
>>> >
>>> >
>>> >
>>> > On Fri, Nov 27, 2020 at 12:35 PM KKing <kicking177 at gmail.com
>>> > <mailto:kicking177 at gmail.com>> wrote:
>>> >
>>> >     I've just run the following code in 3.12.2 on Debian10 LXDE and
>>> >     Debian10
>>> >     KDE.
>>> >     NB I'm creating as just "Graphical Application" (i.e. not QT or
>>> GTK)
>>> >        - - - - - -
>>> >     Private hToolButton As ToolButton
>>> >
>>> >     Public Sub btnTest_Click()
>>> >         Dim intIndex As Integer
>>> >         For intIndex = 0 To 2
>>> >           hToolButton = New ToolButton(Me) As "My_Button"
>>> >           hToolButton.Top = 0 + (intIndex * 30)
>>> >           hToolButton.Left = 0
>>> >           hToolButton.Width = 300
>>> >           hToolButton.Height = 30
>>> >           hToolButton.Text = "MyButton" & CStr(intIndex)
>>> >         Next
>>> >     End
>>> >
>>> >     Public Sub btnRemove_Click()
>>> >
>>> >         Me["My_Button"].Delete
>>> >
>>> >     End
>>> >
>>> >     Public Sub My_Button_Click()
>>> >
>>> >         Message.Info("Hello")
>>> >
>>> >     End
>>> >        - - - - - -
>>> >
>>> >     On LXDE the btnTest generates the 3 buttons
>>> >     click btnRemove once removes the first drawn button the remaining
>>> >     buttons still function
>>> >     click again and it removes the second drawn button the remaining
>>> button
>>> >     still functions
>>> >     click again and it removes the third and last drawn button.
>>> >
>>> >     *** How could I just selectively remove a button based on index?
>>> >
>>> >     NB the index for 0 to 2 is just for this example test, in desired
>>> >     application there would be a variable and large number of buttons
>>> >     determined by data and user interaction.
>>> >
>>> >     As a workaround I could do
>>> >           hToolButton = New ToolButton(Me) As "My_Button" &
>>> CStr(intIndex)
>>> >     which allows me to absolutely delete individual buttons but it
>>> means
>>> >     instead of having one
>>> >           Public Sub My_Button_Click()
>>> >     I would have to code a large number sub just in case needed, for
>>> this
>>> >     example it would just need
>>> >           Public Sub My_Button0_Click()
>>> >           Public Sub My_Button1_Click()
>>> >           Public Sub My_Button2_Click()
>>> >     But in the real application I may needs something like potentially
>>> >     60 of
>>> >     them!
>>> >
>>> >     ALSO
>>> >     running the same code in Debian10 KDE does not work the same.
>>> >     Clicking btnRemove once removes the last drawn button only (and the
>>> >     first two buttons still work)
>>> >     But when click btnRemove again to remove next button it complains
>>> >     Me["My_Button"] is a null object
>>> >     K.
>>> >
>>> >     ----[ http://gambaswiki.org/wiki/doc/netiquette ]----
>>> >
>>> >
>>> >
>>> > ----[ http://gambaswiki.org/wiki/doc/netiquette ]----
>>> >
>>>
>>>
>>> ----[ http://gambaswiki.org/wiki/doc/netiquette ]----
>>>
>>
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