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issue #374 limit undo/redo to the last 500 states

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This commit is contained in:
juliandescottes 2016-11-17 10:03:48 +01:00
parent e3b363d757
commit 4b50dfdb5b
1 changed files with 17 additions and 1 deletions
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18
src/js/service/HistoryService.js
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@ -24,6 +24,9 @@
// Interval/buffer (in milliseconds) between two state load (ctrl+z/y spamming)
ns.HistoryService.LOAD_STATE_INTERVAL = 50;
// Maximum number of states that can be recorded.
ns.HistoryService.MAX_SAVED_STATES = 500;
ns.HistoryService.prototype.init = function () {
$.subscribe(Events.PISKEL_SAVE_STATE, this.onSaveStateEvent.bind(this));
@ -41,7 +44,6 @@
};
ns.HistoryService.prototype.saveState = function (action) {
this.stateQueue = this.stateQueue.slice(0, this.currentIndex + 1);
this.currentIndex = this.currentIndex + 1;
var state = {
@ -58,6 +60,13 @@
state.piskel = this.serializer.serialize(piskel);
}
// If the new state pushes over MAX_SAVED_STATES, erase all states between the first and
// second snapshot states.
if (this.stateQueue.length > ns.HistoryService.MAX_SAVED_STATES) {
var firstSnapshotIndex = this.getNextSnapshotIndex_(1);
this.stateQueue.splice(0, firstSnapshotIndex);
this.currentIndex = this.currentIndex - firstSnapshotIndex;
}
this.stateQueue.push(state);
$.publish(Events.HISTORY_STATE_SAVED);
};
@ -92,6 +101,13 @@
return index;
};
ns.HistoryService.prototype.getNextSnapshotIndex_ = function (index) {
while (this.stateQueue[index] && !this.stateQueue[index].piskel) {
index = index + 1;
}
return index;
};
ns.HistoryService.prototype.loadState = function (index) {
try {
if (this.isLoadStateAllowed_(index)) {