Can't scrub timeline with alt + pan trackpad gesture #76464

New Issue

TonyG · 2020-05-06T05:39:28+02:00

TonyG commented

2020-05-06 05:39:28 +02:00

System Information
Operating system: Darwin-17.7.0-x86_64-i386-64bit 64 Bits
Graphics card: NVIDIA GeForce GTX 980 Ti OpenGL Engine NVIDIA Corporation 4.1 NVIDIA-10.33.0 387.10.10.10.40.105
MacOS 10.13.6 + Apple Magic Mouse

Blender Version
Broken: version: 2.83 (sub 15), branch: master, commit date: 2020-05-05 22:28, hash: c036ef1369
Worked: never ?

Short description of error
When using a Magic Mouse it's not possible to navigate the timeline using the "ALT+scroll" default shortcut.
Correct behaviour is seen in this official Blender video.

This shortcut is in : User Preferences > Keymap > "Frame Offset".
You'll see it's actually two instances of the same shortcut :

one to scroll forward (ALT + Wheel Down) >> screen.frame_offset = +1
another to rewind (ALT + Wheel Up) >> screen.frame_offset = -1

This is a problem because the Magic Mouse is actually seen as a trackpad, therefore we have to use the "Mouse/Trackpad Pan" event.
Unfortunately if you do that you are only able to scroll one way, because this shorcut entry doesn't "see" the scrool as bidirectional.

Proposed fix : add a new shortcut entry, like it's been done for "Zoom View" and "Pan View" for example.
{F8515046, size=full}

Exact steps for others to reproduce the error
On a Mac, using a Magic Mouse :
open Blender, in the viewport try to do ALT+scroll > it doesn't scroll the timeline.

**System Information** Operating system: Darwin-17.7.0-x86_64-i386-64bit 64 Bits Graphics card: NVIDIA GeForce GTX 980 Ti OpenGL Engine NVIDIA Corporation 4.1 NVIDIA-10.33.0 387.10.10.10.40.105 MacOS 10.13.6 + Apple Magic Mouse **Blender Version** Broken: version: 2.83 (sub 15), branch: master, commit date: 2020-05-05 22:28, hash: `c036ef1369` Worked: never ? **Short description of error** When using a Magic Mouse it's not possible to navigate the timeline using the "ALT+scroll" default shortcut. Correct behaviour is seen in **[this ](https://www.youtube.com/watch?v=o19U-yPGdyY&feature=youtu.be&t=84)** official Blender video. This shortcut is in : User Preferences > Keymap > "Frame Offset". You'll see it's actually **two instances** of the same shortcut : - one to scroll forward (ALT + Wheel Down) >> `screen.frame_offset = +1` - another to rewind (ALT + Wheel Up) >> `screen.frame_offset = -1` This is a problem because the Magic Mouse is actually seen as a trackpad, therefore we have to use the "Mouse/Trackpad Pan" event. Unfortunately if you do that you are only able to scroll one way, because this shorcut entry doesn't "see" the scrool as bidirectional. Proposed fix : add a new shortcut entry, like it's been done for "Zoom View" and "Pan View" for example. {[F8515046](https://archive.blender.org/developer/F8515046/MagicMouse_timeline_scroll.jpg), size=full} **Exact steps for others to reproduce the error** On a Mac, using a Magic Mouse : open Blender, in the viewport try to do ALT+scroll > it doesn't scroll the timeline.

TonyG commented

2020-05-06 05:57:35 +02:00

I did some code digging and here is the "Frame Offset" operator SCREEN_OT_frame_offset : https://developer.blender.org/diffusion/B/browse/master/source/blender/editors/screen/screen_ops.c$2861

I think this operator miss two things compared to other operators that actually respond to the Apple Magic Mouse :

there's no modal API callback
there's no OPTYPE_GRAB_CURSOR_XY flag

I think there's already other modal callbacks that could be reused from other operators :
From TEXT_OT_scroll : https://developer.blender.org/diffusion/B/browse/master/source/blender/editors/space_text/text_ops.c$2690
or IMAGE_OT_view_zoom : https://developer.blender.org/diffusion/B/browse/master/source/blender/editors/space_image/image_ops.c$607
or VIEW3D_OT_zoom https://developer.blender.org/diffusion/B/browse/master/source/blender/editors/space_view3d/view3d_edit.c$2215
or VIEW2D_OT_zoom : https://developer.blender.org/diffusion/B/browse/master/source/blender/editors/interface/view2d_ops.c$1154

I did some code digging and here is the "Frame Offset" operator `SCREEN_OT_frame_offset` : https://developer.blender.org/diffusion/B/browse/master/source/blender/editors/screen/screen_ops.c$2861 I think this operator miss two things compared to other operators that actually respond to the Apple Magic Mouse : - there's no `modal` API callback - there's no `OPTYPE_GRAB_CURSOR_XY` flag I think there's already other modal callbacks that could be reused from other operators : From `TEXT_OT_scroll` : https://developer.blender.org/diffusion/B/browse/master/source/blender/editors/space_text/text_ops.c$2690 or `IMAGE_OT_view_zoom` : https://developer.blender.org/diffusion/B/browse/master/source/blender/editors/space_image/image_ops.c$607 or `VIEW3D_OT_zoom` https://developer.blender.org/diffusion/B/browse/master/source/blender/editors/space_view3d/view3d_edit.c$2215 or `VIEW2D_OT_zoom` : https://developer.blender.org/diffusion/B/browse/master/source/blender/editors/interface/view2d_ops.c$1154

Richard Antalik commented

2020-05-08 00:58:58 +02:00

I don't think you need modal handler for this. Just use +1 / -1 offset and instead of any direction, use left or right or what magic mouse will do. Modal operation may be more precise or friendly though.

I am not familiar with this hardware and don't have any trackpad to test with. It's just a suggestion.

I don't think you need modal handler for this. Just use +1 / -1 offset and instead of any direction, use left or right or what magic mouse will do. Modal operation may be more precise or friendly though. I am not familiar with this hardware and don't have any trackpad to test with. It's just a suggestion.

Ankit Meel commented

2020-05-09 12:12:13 +02:00

I think this should be confirmed. On trackpad too, no combination lets me scroll timeline with alt +

I think this should be confirmed. On trackpad too, no combination lets me scroll timeline with alt + <some trackpad gesture >

Richard Antalik commented

2020-05-10 06:39:58 +02:00

In #76464#927633, @ankitm wrote:
I think this should be confirmed. On trackpad too, no combination lets me scroll timeline with alt +

If you can check I guess you could confirm, as I said, I am not familiar with that hardware.

> In #76464#927633, @ankitm wrote: > I think this should be confirmed. On trackpad too, no combination lets me scroll timeline with alt + <some trackpad gesture > If you can check I guess you could confirm, as I said, I am not familiar with that hardware.

TonyG commented

2020-05-10 12:19:08 +02:00

In #76464#927953, @iss wrote:

In #76464#927633, @ankitm wrote:
I think this should be confirmed. On trackpad too, no combination lets me scroll timeline with alt +

If you can check I guess you could confirm, as I said, I am not familiar with that hardware.

Just checked here : cannot scroll timeline using trackpad on laptop.

> In #76464#927953, @iss wrote: >> In #76464#927633, @ankitm wrote: >> I think this should be confirmed. On trackpad too, no combination lets me scroll timeline with alt + <some trackpad gesture > > > If you can check I guess you could confirm, as I said, I am not familiar with that hardware. Just checked here : cannot scroll timeline using trackpad on laptop.

Brecht Van Lommel commented

2020-05-10 14:00:40 +02:00

I'm confused by the description here. But from what I gather, the request is that Alt + Mouse/Trackpad Pan should be a shortcut for changing the current frame.

Which is different than scrolling, which is done with Mouse/Trackpad Pan without any modifier key.

I'm confused by the description here. But from what I gather, the request is that Alt + Mouse/Trackpad Pan should be a shortcut for changing the current frame. Which is different than scrolling, which is done with Mouse/Trackpad Pan without any modifier key.

Brecht Van Lommel changed title from ~~MacOS + Apple Magic Mouse : Can't scroll timeline~~ to MacOS + Apple Magic Mouse : Can't scrub timeline with alt + pan gesture

2020-05-10 14:00:59 +02:00

TonyG commented

2020-05-10 14:18:52 +02:00

In #76464#928132, @brecht wrote:
I'm confused by the description here. But from what I gather, the request is that Alt + Mouse/Trackpad Pan should be a shortcut for changing the current frame.

That's right, it should be added, the same way it is for viewport zooming.

Which is different than scrolling, which is done with Mouse/Trackpad Pan without any modifier key.

To be accurate :

scrolling is a two-state action : scroll-up & scroll down
Mouse/Trackpad Pan is a positional input (XY coordinate or delta I guess) >> right now this input is not recognized by the "Frame Offset" operator

> In #76464#928132, @brecht wrote: > I'm confused by the description here. But from what I gather, the request is that Alt + Mouse/Trackpad Pan should be a shortcut for changing the current frame. That's right, it should be added, the same way it is for viewport zooming. > Which is different than scrolling, which is done with Mouse/Trackpad Pan without any modifier key. To be accurate : - *scrolling* is a two-state action : scroll-up & scroll down - *Mouse/Trackpad* Pan is a positional input (XY coordinate or delta I guess) >> right now this input is not recognized by the "Frame Offset" operator

Yevgeny Makarov self-assigned this 2020-08-11 15:31:12 +02:00

Yevgeny Makarov commented

2020-08-11 15:31:12 +02:00

Trying to implement this, and I have questions.

should it be Horizontal panning (more natural for the Timeline but may differ from zooming)
or it should respect Zoom Axis preference (so default will be Vertical direction)

It can also work in both directions, but it doesn't work very well in some cases (diagonal movement top-left - bottom-right).

How fast it should scrub:

it quite fast by default (if pan delta = frame offset), it looks like a scrubbing video in QuickTime
or it should mimic Mouse Wheel behavior, so that you can easily change the current frame with one-frame steps (although I don't think trakpad is supposed to do that)

Trying to implement this, and I have questions. 1. should it be Horizontal panning (more natural for the Timeline but may differ from zooming) 2. or it should respect Zoom Axis preference (so default will be Vertical direction) *It can also work in both directions, but it doesn't work very well in some cases (diagonal movement top-left - bottom-right).* How fast it should scrub: 1. it quite fast by default (if pan delta = frame offset), it looks like a scrubbing video in QuickTime 2. or it should mimic Mouse Wheel behavior, so that you can easily change the current frame with one-frame steps (although I don't think trakpad is supposed to do that)

Brecht Van Lommel commented

2020-08-11 16:42:03 +02:00

In #76464#994473, @jenkm wrote:
Trying to implement this, and I have questions.

should it be Horizontal panning (more natural for the Timeline but may differ from zooming)

or it should respect Zoom Axis preference (so default will be Vertical direction)

It can also work in both directions, but it doesn't work very well in some cases (diagonal movement top-left - bottom-right).

I think 1, panning does not have to match zooming.

How fast it should scrub:

it quite fast by default (if pan delta = frame offset), it looks like a scrubbing video in QuickTime

or it should mimic Mouse Wheel behavior, so that you can easily change the current frame with one-frame steps (although I don't think trakpad is supposed to do that)

Can it have the same speed as panning, basically just moving the playhead instead of the background? So the speed would depend on the zoom level.

> In #76464#994473, @jenkm wrote: > Trying to implement this, and I have questions. > > 1. should it be Horizontal panning (more natural for the Timeline but may differ from zooming) > 2. or it should respect Zoom Axis preference (so default will be Vertical direction) > > *It can also work in both directions, but it doesn't work very well in some cases (diagonal movement top-left - bottom-right).* I think 1, panning does not have to match zooming. > How fast it should scrub: > > 1. it quite fast by default (if pan delta = frame offset), it looks like a scrubbing video in QuickTime > 2. or it should mimic Mouse Wheel behavior, so that you can easily change the current frame with one-frame steps (although I don't think trakpad is supposed to do that) Can it have the same speed as panning, basically just moving the playhead instead of the background? So the speed would depend on the zoom level.

Yevgeny Makarov commented

2020-08-11 16:57:43 +02:00

Can it have the same speed as panning, basically just moving the playhead instead of the background? So the speed would depend on the zoom level.

I thought so at first, but the screen.frame_offset works in all editors.

UPD: it is possible for anim.change_frame.

> Can it have the same speed as panning, basically just moving the playhead instead of the background? So the speed would depend on the zoom level. I thought so at first, but the `screen.frame_offset` works in all editors. UPD: it is possible for `anim.change_frame`.

Yevgeny Makarov removed their assignment 2021-12-20 22:03:49 +01:00

Philipp Oeser removed the

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Can't scrub timeline with alt + pan trackpad gesture #76464