Never get wxEVT_MOUSEWHEEL on wxSlider (Issue #25819)

Bradley Whited

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Sep 19, 2025, 8:06:13 PM (5 days ago) Sep 19

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esotericpig created an issue (wxWidgets/wxWidgets#25819)

Description

Bug description:

wxSlider never receives events for wxEVT_MOUSEWHEEL.

Essentially, I want to disable using the mouse wheel over my Sliders.

This is because my Sliders are inside of a Scrolled window, so when you scroll the window, it then scrolls the sliders as you pass over them, which causes a bad UX.

Is this possible some other way?

Patch or snippet allowing to reproduce the problem:

minimal.cpp

Note that even with only slider->Bind() and the other Binds commented out, it still doesn't get the event (no wxPuts called).

@@ -175,6 +175,32 @@
     CreateStatusBar(2);
     SetStatusText("Welcome to wxWidgets!");
 #endif // wxUSE_STATUSBAR
+
+    auto* panel = new wxPanel{this};
+    auto* sizer = new wxBoxSizer{wxVERTICAL};
+
+    auto* slider = new wxSlider{panel,wxID_ANY,25,1,50,wxDefaultPosition,wxDefaultSize,wxSL_HORIZONTAL};
+
+    wxPuts("binding mouse wheel to slider");
+    slider->Bind(wxEVT_MOUSEWHEEL,[](wxMouseEvent&) {
+        // this never gets called
+        wxPuts("==> mouse wheel on slider?");
+    });
+
+    Bind(wxEVT_MOUSEWHEEL,[](wxMouseEvent&) {
+        // this never gets called
+       wxPuts("[frame] mouse wheel");
+    });
+    panel->Bind(wxEVT_MOUSEWHEEL,[](wxMouseEvent&) {
+       // this only gets called when on the panel and not over the child slider
+       wxPuts("[panel] mouse wheel");
+    });
+
+    sizer->Add(slider,0,wxALL | wxEXPAND,5);
+
+    panel->SetSizer(sizer);
+    sizer->Layout();
+    sizer->Fit(panel);
 }

Platform and version information

wxWidgets version you use: 3.3.1 (using latest one from vcpkg)
wxWidgets port you use: wxGTK
OS and its version: Ubuntu 22.04 LTS
- GTK version: 3.24.33
- Which GDK backend is used: X11
- Desktop environment: GNOME

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oneeyeman1

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Sep 20, 2025, 1:04:15 AM (5 days ago) Sep 20

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oneeyeman1 left a comment (wxWidgets/wxWidgets#25819)

@esotericpig ,
Why not use wxEVT_SCROLL and just do nothing there?

Thank you.

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Bradley Whited

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Sep 20, 2025, 4:32:40 PM (4 days ago) Sep 20

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esotericpig left a comment (wxWidgets/wxWidgets#25819)

@oneeyeman1

Thanks for the reply. I tried this, but even with an empty function, I can continue to scroll the slider with the mouse wheel. I even tried event.Skip(false); but doesn't work. How can I cancel the mouse wheel event?

It does correctly print "on scroll" to stdout, so I'm getting the event.

Also, it would be nice to have a wxEVT_SCROLL or similar that binds to all so that I don't have to create an event table [I prefer using Bind()], not sure if that exists?

Here's what I tried:

class MyFrame : public wxFrame
{
public:
    //...

    wxSlider* slider{};

    void OnScroll(wxScrollEvent& event) {
        // do nothing
        wxPuts("on scroll");
    }
}

enum
{
    //...

    Minimal_Slider = 1,
};

wxBEGIN_EVENT_TABLE(MyFrame, wxFrame)
    //...

    EVT_COMMAND_SCROLL(Minimal_Slider, MyFrame::OnScroll)
    EVT_SCROLL(MyFrame::OnScroll)
wxEND_EVENT_TABLE()


MyFrame::MyFrame(const wxString& title)
       : wxFrame(nullptr, wxID_ANY, title)
{
    //...

    slider = new wxSlider{panel,Minimal_Slider,25,1,50,wxDefaultPosition,wxDefaultSize,wxSL_HORIZONTAL};

    //...
}

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oneeyeman1

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Sep 20, 2025, 4:55:20 PM (4 days ago) Sep 20

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oneeyeman1 left a comment (wxWidgets/wxWidgets#25819)