Re: How do I disable mousewheel scrolling?

Thank you, Steve, I have things working now. But maybe not entirely as you
described. Here is the code now...

[image: image.png]
but, the definition of the handler 'onMW' is not quite what you suggested.
[image: image.png]
The definition is not* 'def name(self, evt):'  *as you can see. With the '
*self*' parameter I get the following non-fatal error:
*TypeError: OnMW() missing 1 required positional argument: 'evt'*
I am still trying to digest all of the information in your last reply.
Thanks for the help. Of course, now I realize that I can have the same
problem with the UP/DOWN arrow keys or even certain alphabetic key presses.
If needed, I think a similar approach with KEY_EVENTS will handle that
issue if needed.

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

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

On Sat, 20 Jun 2020 at 15:04, Steve Barnes <[email protected]> wrote:

> Lawrence,
>
>
>
> The format is object.Bind(*event_binder*, *handler_function*) where the
> *handler_function* needs the signature *def name(self, evt):* and the
> actual events that match the binder will be passed in as the* evt*
> parameter.
>
>
>
> In your code below you need line 103 as:
>
>
>
> self.choice_1.Bind(wx.EVT_MOUSEWHEEL, utils.OnMW)  # Note no parameters to
> the handler at this point
>
>
>
> The bind and caller mechanism handles the addition of the event parameter
> when an event is being handled and the code called. In your 103 below you
> are trying to bind the event to the result of calling
> utils.OnMW(self.choice_1, wx.EVT_MOUSEWHEEL) which will be None.
>
>
>
> The other thing to know is that wx.EVT_MOUSEWHEEL and the other wx.EVT_*
> items are not themselves events they are wx.core.PyEventBinder objects.
>
>
>
> To try to clarify:
>
>
>
> At bind time the handler is associated with a given objects/component
> event handling stack. When an event happens on any object that objects
> event handler stack is checked to see if it has a handler for that event.
> If it does that handler is called and if it ends with skip(True) or if
> there is no handler the objects parent control is passed the event. This
> continues until a handler is found that ends with skip(False) or the OS
> receives the event. Note that in this case we are talking parentage in the
> Windows terms rather than the code terms so the parent of choice_1 is
> self.panel_1 which has a parent of frame_1, .
>
>
>
> Quite a concept to get your head round – hope that helps.
>
>
>
> Steve Barnes
>
>
>
> *From:* [email protected] <[email protected]> *On
> Behalf Of *Lawrence Gray
> *Sent:* 20 June 2020 18:02
> *To:* [email protected]
> *Subject:* Re: [wxPython-users] 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.
>
> 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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