Animation: Graph Editor Handle Selection #111143
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Sybren A. Stüvel
Christoph Lendenfeld
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Reference: blender/blender#111143
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Delete Branch "nathanvegdahl/blender:select_handles_patch"
Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?
Continuation of PR #108142 from @cgtinker.
This patch adds an operator for the graph editor,
graph.select_key_handles,that changes the selection of the different parts of a bezier keyframe. It
operates on all keys that are either themselves selected or have either of
their handles selected, and changes whether the key itself and/or its handles
are selected.
The operator has three options:
left_handle_actionright_handle_actionkey_actionEach of which can be set to:
Co-authored-by: cgtinker Denys.Hsu@gmail.com
I think the operator parameters could be made both a little clearer and more flexible with this approach:
Three parameters:
left_handleright_handlekeyframeEach of which can be "select", "deselect", or "leave alone". (Better naming for the last one welcome!)
What do people think?
@nathanvegdahl the current state of the code looks good to me
But I agree the parameters should be broken up into 3 separate parameters
the last option I suggest is "keep"
Some minor remarks. Can be adjusted when landing.
@ -2067,0 +2126,4 @@* Select keyframe handles left/right/both or keys based on the given selection.** mode: Determines which handles to select - left, right, or both.* deselect_keyframe: Specifies whether keyframes should be deselected (true) or if the currentSuggestion: "whether keyframes should" → "whether the keys themselves should".
@ -2067,0 +2148,4 @@continue;}switch (mode) {case GRAPHKEYS_HANDLESEL_BOTH: {Remove the curly braces, they are only necessary when introducing new variables inside the
case.@ -2067,0 +2161,4 @@break;}case GRAPHKEYS_HANDLESEL_KEY: {ANIM_fcurve_keyframes_loop(NULL, fcu, NULL, bezt_sel_keys, NULL);Missing
break@ -2067,0 +2185,4 @@const eGraphKey_HandleSelect_Side leftright = static_cast<eGraphKey_HandleSelect_Side>(RNA_enum_get(op->ptr, "mode"));const bool deselect_keyframe = RNA_boolean_get(op->ptr, "deselect_keyframe");/* Perform selection changes. */You don't need to explain what the function does at the call site of the function. If it needs explanation, choose a better function name.
@ -2067,0 +2199,4 @@uiLayout *layout = op->layout;uiLayout *row;bool keyframe_selection = RNA_enum_get(op->ptr, "mode") == GRAPHKEYS_HANDLESEL_KEY;const, and move this line down to wherekeyframe_selectionis actually used.@ -2067,0 +2200,4 @@uiLayout *row;bool keyframe_selection = RNA_enum_get(op->ptr, "mode") == GRAPHKEYS_HANDLESEL_KEY;row = uiLayoutRow(layout, false);Declare
rowhere, and not at the start of the function. The days of AncientC are over.@ -2067,0 +2230,4 @@GRAPHKEYS_HANDLESEL_BOTH,"Mode","Selects corresponding keyframe handles (left, right, both or keys) based on the given ""selection");"Selects ... based on the given selection" is not the clearest explanation. Suggestion:
Since the functionality has become a bit more flexible, I changed the description. Would love to have your eyes on it again.
5c7fe5ed49to47e50a8383I've updated the PR to the new options I outlined earlier.
Now that I've done that, however, it's not clear to me that the current operator name is appropriate anymore, given its additional flexibility. Maybe something like "Select Keyframe Parts"? @ChrisLend @dr.sybren Any ideas?
(The menu entries can still be labeled with what they each do, though, I think. "Select Handles", "Select Left Handles", etc.)
Brought naming of the operator up at the module meeting, and consensus was "Select Key / Handles".
I changed the operator name. Still not happy with the tool tips. I'll work on improving those next.
967f92f89bto5c5be1b8b5@ -220,0 +229,4 @@props = layout.operator("graph.select_key_handles", text="Select Handles Right")props.left_handle_action = 'DESELECT'props.right_handle_action = 'SELECT'props.key_action = 'KEEP'I think this should be 'DESELECT' because right now using this option you still have the key selected, meaning when using G to move it you move the key and not the handle.
Good call.
But now that I think of it, do we even need the left/right versions in there at all? The primary use case is quickly selecting/deselecting both handles together. It's still good for the core operator to be flexible, so users with more niche use cases can do what they like. But for the provided menu items it might be best to just have "Select Handles" and "Select Keys".
Thoughts?
In the context of this issue it makes sense to only have "Select Handles" and "Select Keys"
When talking about animation in general it could make sense to have a shortcut to only select handles on one side. But since the functionality exists it is reasonably easy to expose in a GUI. Maybe even a pie menu. But we can leave that for the future I think
Yeah. I also checked with one of the animators here at the studio, and he said he would use Select Handles and Select Keys, but couldn't think of a common use for left/right. Of course, that's just a sample size of one. But I think it makes sense to keep things minimal now, and like you said we can always add more things and explore other ways to expose this in the future.
yep looks good to me :)
@ -2067,0 +2109,4 @@int i = 0;BezTriple *bezt = fcu->bezt;for (; i < fcu->totvert; bezt++, i++) {Personally I am not a fan of pointer incrementing. But I will leave this up to you
Ah, fair point. I basically just copy-pasted this from elsewhere. I agree that just using the index directly makes more sense here. Thanks for the catch!