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added nested undo... (experimental)

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Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>
This commit is contained in:
Alex A. Naanou 2022-02-24 03:24:07 +03:00
parent af109c13f8
commit 71849ae9b3
1 changed files with 24 additions and 8 deletions
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32
Viewer/features/core.js
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@ -2007,6 +2007,9 @@ var JournalActions = actions.Actions({
data.slice()
: this.updateJournalableActions() }) },
// XXX can things get on the journal while an action is running??? (race)
// ...if yes, this would make the way nested actions are collected
// wrong...
// XXX <action>.getUndoState(..) should be called for every action
// in chain...
// XXX should aliases support explicit undo??? (test)
@ -2040,6 +2043,11 @@ var JournalActions = actions.Actions({
// action state, only set on undoable actions when undone.
undone: true | false,
// nested action journal (optional)
// this contains actions called from within the current
// action that can be undone.
nested: [ ... ],
// additional data, can be set via:
// <action>.getUndoState(<data>)...
@ -2055,6 +2063,7 @@ var JournalActions = actions.Actions({
var that = this
var handler = function(action){
return function(){
var len = (this.journal || []).length
var data = {
type: 'basic',
date: Date.now(),
@ -2076,6 +2085,9 @@ var JournalActions = actions.Actions({
// journal after the action is done...
return function(){
data.target = this.current
// collect nested journal data...
if((this.journal || []).length > len){
data.nested = (this.journal || []).splice(len) }
// prep to get additional undo state...
// XXX this should be called for all actions in chain...
var update = that.getActionAttrAliased(action, 'getUndoState')
@ -2140,21 +2152,23 @@ var JournalActions = actions.Actions({
// run action...
[e.action].apply(that, e.args) }) }],
// XXX might be a good idea to add support for:
// - time-periods - DONE
// - specific times - DONE
// ...might be a good idea to support date strings directly...
// XXX needs very careful revision...
// - should this be thread safe??? (likely not)
// - revise actions...
// XXX handle .nested undo actions...
// ...either automatically or allow the client to recursively
// call the undo handler for them...
// XXX how do we handle nested action calls??
// Example:
// .toggleMark(..) -> .tag(..)
// ...one way to do this is to group all the nested calls and
// undo them as one unit, this should also be controllable by
// the root action...
// XXX needs very careful revision...
// - should this be thread safe??? (likely not)
// - revise actions...
// XXX should we stop at non-undoable actions???
// ...intuitively, yes, as undoing past these may result in an
// inconsistent state...
// XXX should we implement redo as an undo of undo?
// XXX use .journalUnsaved...
// XXX use .journalUnsaved???
undo: ['Edit/Undo',
doc`Undo last action(s) from .journal that can be undone
@ -2253,6 +2267,8 @@ var JournalActions = actions.Actions({
// so we will need to restore things...
this.journal = journal
this.rjournal = rjournal }],
// NOTE: we do not have to care about .nested actions on the redo
// level as they will be nested again by the root action...
redo: ['Edit/Redo',
doc`Redo an action from .rjournal