Re: How do I disable mousewheel scrolling?

Again, thank you for your assistance.

It seems so simple, I was able to replicate what you did in the example
code for wxPython and I thought I understood what is going on.  But I still
keep running into the same roadblocks that I initially had trying to
implement this in the first place.
As suggested, I created a utility file containing the 'OnMW' method you
defined and import this from the GUI file:
*import FS_utils AS utils*
From the postCode section of the Code panel for the control, in wxGlade, I
inserted various code to 'Bind' the mousewheel event to the function in a
manner that I believe replicates what you had done in the demo code. This
is the relevant code generated by wxGlade.
[image: image.png]
Hope this code snippet comes through.
In line 101, I thought I would simply bind the event to the action needed,
ie, skip the event. This fails with, *"NameError: name 'event' is not
defined"*
In line 102, in which I call the function 'OnMW' from the imported file,
with parameters. As OnMW is not defined within the 'Frame' class, I thought
it was necessary to pass something to the function. This fails in the same
manner as line 101
In line 103, in which I *think, *but I'm not sure that I am passing the
event explicitly to the function, also fails.


*File "D:\Lawrence Gray\My Documents\Python\Financial Summary\FS_utils.py",
line 11, in OnMW    evt.Skip(False)AttributeError: 'PyEventBinder' object
has no attribute 'Skip'*

Should I simply define a function 'OnMW' within the Frame class to handle
the event, or call the function in the utility file. In either case, when I
try, it fails.
*AttributeError: 'MyFrame' object has no attribute 'OnMW'*

As for the "NameError's" above, in your example code from the wxPython
demo, I don't see where the function 'OnMW' gets a value for the parameter
'evt', and yet this magic doesn't seem to happen in my code.

Now, I am thoroughly befuddled.

PS:
Just at the last minute I noticed that I had this statement at the
beginning of the file as part of my initial attempts to resolve the issue
Could this be causing a problem?
from wx import MouseEvent as ME

Regards
-- 
------------------------------

*Lawrence Gray *
------------------------------

On Fri, 19 Jun 2020 at 13:40, Steve Barnes <[email protected]> wrote:

> Lawrence,
>
>
>
> Event handling and such is a bit of a mystery for many people. The trick I
> think would be to have a handler something along the lines of:
>
>
>
> def NoMouseWheel(self, evt):
>
> """ Don't action the mousewheel """
>
> evt.Skip(False)
>
>
>
> And for those controls, that when they have the focus you don’t wish mouse
> wheel  to do anything, you do self.control.Bind(wx.EVT_MOUSEWHEEL, self.
> NoMouseWheel) on that control. wxGlade doesn’t seem to of heard of
> MOUSEWHEEL events yet ☹
>
>
>
> In the demo code for wx.Choice I tried and sure enough the mousewheel
> changes the value when the choice has focus, but with the change below it
> doesn’t:
>
>
>
> You should be able to put the method into an import file, *e.g.
> GUI_Utils.py,* and handle this via the code tab for each of the controls.
>
>
>
> Hope that helps.
>
>
>
> Steve
>
>
>
> *From:* [email protected] <[email protected]> *On
> Behalf Of *Lawrence Gray
> *Sent:* 19 June 2020 16:16
> *To:* [email protected]
> *Subject:* Re: [wxPython-users] How do I disable mousewheel scrolling?
>
>
>
> Thank you for replying.
>
>
>
> That was actually my first thought but I couldn't implement it and still
> seem unable to do so. None of the wxPython demo programs provides the
> necessary insight for me. Event handling is still a mystery I am trying to
> come to grips with. If you could provide more detail, it would be greatly
> appreciated. As I am currently using wxGlade to generate the GUI code and
> trying to keep any business code separate from the GUI code I would
> ultimately prefer to implement a solution within the confines of the
> wxGlade project, but if that is not feasible, I will have to move out of my
> comfort zone.
>
>
>
> I am attaching my wxGlade project file and the code it generates for
> anyone so inclined to look at it. I am using wxGlade v0.9.6, python3.5.2
> and wxPython4.0.3
>
>
> Regards
> --
> ------------------------------
>
> *Lawrence Gray*
> ------------------------------
>
>
>
> On Fri, 19 Jun 2020 at 05:08, Steve Barnes <[email protected]> wrote:
>
> Rather than attempting to Disable mouse wheel scrolling you simply add a
> handler, to the controls that you don’t want to react to the mouse wheel,
> for EVT_MOUSEWHEEL which just does nothing. Then when those controls have
> focus nothing happens on mouse wheel events.
>
>
>
> Hope that helps.
>
>
>
> Steve Barnes
>
>
>
> *From:* [email protected] <[email protected]> *On
> Behalf Of *Lawrence Gray
> *Sent:* 18 June 2020 18:14
> *To:* [email protected]
> *Subject:* [wxPython-users] How do I disable mousewheel scrolling?
>
>
>
> I have created a simple application part of which incorporates  a number
> (10) of choice elements in a horizontal sizer . These are displayed above a
> listCtrl and have their width resized to match the widths of the columns in
> the listCtrl. They effectively form headers for the listCtrl data.  The
> selection in each choice box controls the disposition of the data in that
> column in subsequent processing. The selection list in all of the choice
> controls are identical. Some of the selection choices must be unique for
> the data presented in the listCtrl, ie. no two columns can have identical
> selections. Some selection choices are allowed multiple times and some
> selection choices are mutually exclusive. For example, if one column is
> labelled "Date", which logically should be unique for my purpose, and
> another column choice selection is set to "Date", the previous column is
> reset to the default value "--NA--", which means that column data is mow
> ignored.
>
>
>
> My problem is that when I make a choice selection in one column and
> inadvertently or purposely scroll the mouse wheel, the choice selections in
> other columns are quickly altered as the choice selection list is scrolled,
> creating havoc.
>
>
>
> My question is, how do I disable mouse wheel scrolling of the selection
> list, after making my selection? Is this to the best or only way to get
> around the problem? What about, after making a selection, altering the
> focus to the listCtrl, where scrolling of the mouse wheel would not matter?
>
>
>
> This is my first attempt at creating any GUI application. I am using
> wxPython in conjunction with wxGlade.
>
>
>
> Any advice is appreciated.
>
>
> Regards
> --
> ------------------------------
>
> *Lawrence Gray*
> ------------------------------
>
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