mol-plugin: state snapshot playback

src/mol-plugin/behavior/static/state.ts

@@ -158,9 +158,7 @@ export function Snapshots(ctx: PluginContext) {
 
     PluginCommands.State.Snapshots.Fetch.subscribe(ctx, async ({ url }) => {
         const json = await ctx.runTask(ctx.fetch({ url, type: 'json' })); //  fetch(url, { referrer: 'no-referrer' });
-        const snapshot = ctx.state.snapshots.setRemoteSnapshot(json.data);
-        if (!snapshot) return;
-        return ctx.state.setSnapshot(snapshot);
+        await ctx.state.snapshots.setRemoteSnapshot(json.data);
     });
 
     PluginCommands.State.Snapshots.DownloadToFile.subscribe(ctx, ({ name }) => {

src/mol-plugin/skin/base/icons.scss

@@ -165,3 +165,23 @@
 .msp-icon-switch:before {
 	content: "\e896";
 }
+
+.msp-icon-play:before {
+	content: "\e897";
+}
+
+.msp-icon-stop:before {
+	content: "\e898";
+}
+
+.msp-icon-pause:before {
+	content: "\e899";
+}
+
+.msp-icon-left-open:before {
+	content: "\e87c";
+}
+
+.msp-icon-right-open:before {
+	content: "\e87d";
+}
\ No newline at end of file

src/mol-plugin/state.ts

@@ -25,7 +25,7 @@ class PluginState {
     readonly behaviorState: State;
     readonly animation: PluginAnimationManager;
     readonly cameraSnapshots = new CameraSnapshotManager();
-    readonly snapshots = new PluginStateSnapshotManager();
+    readonly snapshots: PluginStateSnapshotManager;
 
     readonly behavior = {
         kind: this.ev.behavior<PluginState.Kind>('data'),
@@ -89,6 +89,7 @@ class PluginState {
     }
 
     constructor(private plugin: import('./context').PluginContext) {
+        this.snapshots = new PluginStateSnapshotManager(plugin);
         this.dataState = State.create(new SO.Root({ }), { globalContext: plugin });
         this.behaviorState = State.create(new PluginBehavior.Root({ }), { globalContext: plugin, rootProps: { isLocked: true } });
 

src/mol-plugin/state/snapshots.ts

@@ -8,14 +8,20 @@ import { List } from 'immutable';
 import { UUID } from 'mol-util';
 import { PluginState } from '../state';
 import { PluginComponent } from 'mol-plugin/component';
+import { PluginContext } from 'mol-plugin/context';
 
 export { PluginStateSnapshotManager }
 
 class PluginStateSnapshotManager extends PluginComponent<{
     current?: UUID | undefined,
     entries: List<PluginStateSnapshotManager.Entry>,
-    entryMap: Map<string, PluginStateSnapshotManager.Entry>
+    isPlaying: boolean,
+    nextSnapshotDelayInMs: number
 }> {
+    static DefaultNextSnapshotDelayInMs = 1500;
+
+    private entryMap = new Map<string, PluginStateSnapshotManager.Entry>();
+
     readonly events = {
         changed: this.ev()
     };
@@ -28,14 +34,14 @@ class PluginStateSnapshotManager extends PluginComponent<{
 
     getEntry(id: string | undefined) {
         if (!id) return;
-        return this.state.entryMap.get(id);
+        return this.entryMap.get(id);
     }
 
     remove(id: string) {
-        const e = this.state.entryMap.get(id);
+        const e = this.entryMap.get(id);
         if (!e) return;
 
-        this.state.entryMap.delete(id);
+        this.entryMap.delete(id);
         this.updateState({
             current: this.state.current === id ? void 0 : this.state.current,
             entries: this.state.entries.delete(this.getIndex(e))
@@ -44,7 +50,7 @@ class PluginStateSnapshotManager extends PluginComponent<{
     }
 
     add(e: PluginStateSnapshotManager.Entry) {
-        this.state.entryMap.set(e.snapshot.id, e);
+        this.entryMap.set(e.snapshot.id, e);
         this.updateState({ current: e.snapshot.id, entries: this.state.entries.push(e) });
         this.events.changed.next();
     }
@@ -56,7 +62,7 @@ class PluginStateSnapshotManager extends PluginComponent<{
         const idx = this.getIndex(old);
         // The id changes here!
         const e = PluginStateSnapshotManager.Entry(snapshot, old.name, old.description);
-        this.state.entryMap.set(snapshot.id, e);
+        this.entryMap.set(snapshot.id, e);
         this.updateState({ current: e.snapshot.id, entries: this.state.entries.set(idx, e) });
         this.events.changed.next();
     }
@@ -82,7 +88,7 @@ class PluginStateSnapshotManager extends PluginComponent<{
 
     clear() {
         if (this.state.entries.size === 0) return;
-        this.state.entryMap.clear();
+        this.entryMap.clear();
         this.updateState({ current: void 0, entries: List<PluginStateSnapshotManager.Entry>() });
         this.events.changed.next();
     }
@@ -115,11 +121,11 @@ class PluginStateSnapshotManager extends PluginComponent<{
         return this.state.entries.get(idx).snapshot.id;
     }
 
-    setRemoteSnapshot(snapshot: PluginStateSnapshotManager.RemoteSnapshot): PluginState.Snapshot | undefined {
+    async setRemoteSnapshot(snapshot: PluginStateSnapshotManager.RemoteSnapshot): Promise<PluginState.Snapshot | undefined> {
         this.clear();
         const entries = List<PluginStateSnapshotManager.Entry>().asMutable()
         for (const e of snapshot.entries) {
-            this.state.entryMap.set(e.snapshot.id, e);
+            this.entryMap.set(e.snapshot.id, e);
             entries.push(e);
         }
         const current = snapshot.current
@@ -127,11 +133,20 @@ class PluginStateSnapshotManager extends PluginComponent<{
             : snapshot.entries.length > 0
             ? snapshot.entries[0].snapshot.id
             : void 0;
-        this.updateState({ current, entries: entries.asImmutable() });
+        this.updateState({
+            current,
+            entries: entries.asImmutable(),
+            isPlaying: false,
+            nextSnapshotDelayInMs: snapshot.playback ? snapshot.playback.nextSnapshotDelayInMs : PluginStateSnapshotManager.DefaultNextSnapshotDelayInMs
+        });
         this.events.changed.next();
         if (!current) return;
-        const ret = this.getEntry(current);
-        return ret && ret.snapshot;
+        const entry = this.getEntry(current);
+        const next = entry && entry.snapshot;
+        if (!next) return;
+        await this.plugin.state.setSnapshot(next);
+        if (snapshot.playback &&  snapshot.playback.isPlaying) this.play();
+        return next;
     }
 
     getRemoteSnapshot(options?: { name?: string, description?: string }): PluginStateSnapshotManager.RemoteSnapshot {
@@ -141,12 +156,52 @@ class PluginStateSnapshotManager extends PluginComponent<{
             name: options && options.name,
             description: options && options.description,
             current: this.state.current,
+            playback: {
+                isPlaying: this.state.isPlaying,
+                nextSnapshotDelayInMs: this.state.nextSnapshotDelayInMs
+            },
             entries: this.state.entries.valueSeq().toArray()
         };
     }
 
-    constructor() {
-        super({ current: void 0, entries: List(), entryMap: new Map() });
+    private timeoutHandle: any = void 0;
+    private next = async () => {
+        this.timeoutHandle = void 0;
+        const next = this.getNextId(this.state.current, 1);
+        if (!next || next === this.state.current) {
+            this.stop();
+            return;
+        }
+        const snapshot = this.setCurrent(next)!;
+        await this.plugin.state.setSnapshot(snapshot);
+        this.timeoutHandle = setTimeout(this.next, this.state.nextSnapshotDelayInMs);
+    };
+
+    play() {
+        this.updateState({ isPlaying: true });
+        this.next();
+    }
+
+    stop() {
+        this.updateState({ isPlaying: false });
+        if (typeof this.timeoutHandle !== 'undefined') clearTimeout(this.timeoutHandle);
+        this.timeoutHandle = void 0;
+        this.events.changed.next();
+    }
+
+    togglePlay() {
+        if (this.state.isPlaying) this.stop();
+        else this.play();
+    }
+
+    constructor(private plugin: PluginContext) {
+        super({
+            current: void 0,
+            entries: List(),
+            isPlaying: false,
+            nextSnapshotDelayInMs: PluginStateSnapshotManager.DefaultNextSnapshotDelayInMs
+        });
+        // TODO make nextSnapshotDelayInMs editable
     }
 }
 
@@ -167,6 +222,10 @@ namespace PluginStateSnapshotManager {
         name?: string,
         description?: string,
         current: UUID | undefined,
+        playback: {
+            isPlaying: boolean,
+            nextSnapshotDelayInMs: number,
+        },
         entries: Entry[]
     }
 }
\ No newline at end of file

src/mol-plugin/ui/controls.tsx

@@ -121,6 +121,10 @@ export class StateSnapshotViewportControls extends PluginUIComponent<{}, { isBus
         if (id) this.update(id);
     }
 
+    togglePlay = () => {
+        this.plugin.state.snapshots.togglePlay();
+    }
+
     render() {
         const snapshots = this.plugin.state.snapshots;
         const count = snapshots.state.entries.size;
@@ -130,14 +134,18 @@ export class StateSnapshotViewportControls extends PluginUIComponent<{}, { isBus
         }
 
         const current = snapshots.state.current;
+        const isPlaying = snapshots.state.isPlaying;
+
+        // TODO: better handle disabled state
 
         return <div className='msp-state-snapshot-viewport-controls'>
-            <select className='msp-form-control' value={current || 'none'} onChange={this.change} disabled={this.state.isBusy}>
+            <select className='msp-form-control' value={current || 'none'} onChange={this.change} disabled={this.state.isBusy || isPlaying}>
                 {!current && <option key='none' value='none'></option>}
                 {snapshots.state.entries.valueSeq().map((e, i) => <option key={e!.snapshot.id} value={e!.snapshot.id}>{`[${i! + 1}/${count}]`} {e!.name || new Date(e!.timestamp).toLocaleString()}</option>)}
             </select>
-            <IconButton icon='model-prev' title='Previous State' onClick={this.prev} disabled={this.state.isBusy} />
-            <IconButton icon='model-next' title='Next State' onClick={this.next} disabled={this.state.isBusy} />
+            <IconButton icon='left-open' title='Previous State' onClick={this.prev} disabled={this.state.isBusy || isPlaying} />
+            <IconButton icon='right-open' title='Next State' onClick={this.next} disabled={this.state.isBusy || isPlaying} />
+            <IconButton icon={isPlaying ? 'pause' : 'play'} title={isPlaying ? 'Pause' : 'Play'} onClick={this.togglePlay} />
         </div>;
     }
 }

src/mol-plugin/ui/state.tsx

@@ -139,7 +139,7 @@ class LocalStateSnapshotList extends PluginUIComponent<{ }, { }> {
     render() {
         const current = this.plugin.state.snapshots.state.current;
         return <ul style={{ listStyle: 'none' }} className='msp-state-list'>
-            {this.plugin.state.snapshots.state.entries.valueSeq().map(e =><li key={e!.snapshot.id}>
+            {this.plugin.state.snapshots.state.entries.map(e =><li key={e!.snapshot.id}>
                 <button data-id={e!.snapshot.id} className='msp-btn msp-btn-block msp-form-control' onClick={this.apply}>
                     <span style={{ fontWeight: e!.snapshot.id === current ? 'bold' : void 0}}>{e!.name || new Date(e!.timestamp).toLocaleString()}</span> <small>{e!.description}</small>
                 </button>