Stop web browser scroll on wheel event

On Oct 15, 2017, at 11:36, dan.cutright@gmail.com wrote:

Does anyone know how to prevent your web browser from scrolling on wheel events?

I'm trying to scroll through a 3D data set, using the mouse wheel to scroll through the z-axis. The code below works great, but the web browser will still scroll on these events. I could not find the Bokeh source code that illustrates how they do this for WheelZoomTool. Presumably this requires some custom JS?

my_figure.on_event(events.MouseWheel, my_wheel_function)

def my_wheel_function(event):
    if scrolling_check_box.active:
        if event.delta > 0:
            go_to_next_slice()
        elif event.delta < 0:
            go_to_previous_slice()

--
You received this message because you are subscribed to the Google Groups "Bokeh Discussion - Public" group.
To unsubscribe from this group and stop receiving emails from it, send an email to bokeh+unsubscribe@continuum.io.
To post to this group, send email to bokeh@continuum.io.
To view this discussion on the web visit https://groups.google.com/a/continuum.io/d/msgid/bokeh/9eee50d0-99dc-4458-9a2d-018d25afc033%40continuum.io\.
For more options, visit https://groups.google.com/a/continuum.io/d/optout\.

On Sunday, October 15, 2017 at 10:54:03 PM UTC-5, Bryan Van de ven wrote:

Hi,

That happens here:

    [https://github.com/bokeh/bokeh/blob/master/bokehjs/src/coffee/core/ui_events.coffee#L185-L188](https://github.com/bokeh/bokeh/blob/master/bokehjs/src/coffee/core/ui_events.coffee#L185-L188)

You’ll probably need to make a custom extension to do this, I doubt it’s possible using only the event. The existing wheel zoom tool implementation is here:

    [https://github.com/bokeh/bokeh/blob/master/bokehjs/src/coffee/models/tools/gestures/wheel_zoom_tool.coffee](https://github.com/bokeh/bokeh/blob/master/bokehjs/src/coffee/models/tools/gestures/wheel_zoom_tool.coffee)

You can probably gut it and make a “do-nothing” scroll tool extension. Just be virtue of being activated/deactivated the stop propagation mode will be enabled or disabled. Then the python event will be useful while the tool is active.

Thanks,

Bryan

On Oct 15, 2017, at 11:36, dan.cu...@gmail.com wrote:

Does anyone know how to prevent your web browser from scrolling on wheel events?

I’m trying to scroll through a 3D data set, using the mouse wheel to scroll through the z-axis. The code below works great, but the web browser will still scroll on these events. I could not find the Bokeh source code that illustrates how they do this for WheelZoomTool. Presumably this requires some custom JS?

my_figure.on_event(events.MouseWheel, my_wheel_function)

def my_wheel_function(event):

if scrolling_check_box.active:

    if event.delta > 0:

        go_to_next_slice()

    elif event.delta < 0:

        go_to_previous_slice()

–
You received this message because you are subscribed to the Google Groups “Bokeh Discussion - Public” group.

To unsubscribe from this group and stop receiving emails from it, send an email to bokeh+un...@continuum.io.

To post to this group, send email to bo...@continuum.io.

To view this discussion on the web visit https://groups.google.com/a/continuum.io/d/msgid/bokeh/9eee50d0-99dc-4458-9a2d-018d25afc033%40continuum.io.

For more options, visit https://groups.google.com/a/continuum.io/d/optout.