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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| <!doctype html> | ||
| <html> | ||
| <head> | ||
| <title>x-state</title> | ||
|
|
||
| <script src="components/platform/platform.js"></script> | ||
| <link rel="import" href="components/polymer/polymer.html"> | ||
| <link rel="import" href="x-state.html"> | ||
| </head> | ||
| <body> | ||
|
|
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| <template is="auto-binding"> | ||
| <button on-tap="{{push}}">Push</button> | ||
| <button on-tap="{{back}}" disabled?="{{!$.state.canBack}}">Back</button> | ||
| <button on-tap="{{forward}}" disabled?="{{!$.state.canForward}}">Forward</button> | ||
| <x-state id="state" on-last-state="{{last}}" on-first-state="{{first}}" on-state-change="{{change}}"></x-state> | ||
| <div>{{state}}</div> | ||
| </template> | ||
| <script> | ||
| var scope = document.querySelector('template'); | ||
| scope.count = 0; | ||
| scope.push = function() { | ||
| this.count++; | ||
| this.updateState(); | ||
| this.$.state.push(scope.state); | ||
| } | ||
|
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| scope.back = function() { | ||
| this.$.state.back(); | ||
| } | ||
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| scope.forward = function() { | ||
| this.$.state.forward(); | ||
| } | ||
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| scope.change = function(e, detail) { | ||
| this.state = detail.state; | ||
| } | ||
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| scope.updateState = function() { | ||
| return this.state = (this.count + Math.random()).toFixed(3); | ||
| } | ||
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| addEventListener('template-bound', function(e) { | ||
| scope.$.state.push(scope.updateState()); | ||
| }) | ||
| </script> | ||
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| </body> | ||
| </html> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
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| <polymer-element name="x-state" attributes="canBack canForward"> | ||
| <script> | ||
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| Polymer('x-state', { | ||
| _cursor: -1, | ||
| cursor: -1, | ||
| canBack: false, | ||
| canForward: false, | ||
| created: function() { | ||
| this.stack = []; | ||
| }, | ||
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| push: function(state) { | ||
| if (!state && state !== 0) { | ||
| return; | ||
| } | ||
| if (!this.isAtLast()) { | ||
| var f = this.cursor + 1; | ||
| this.stack.splice(f, this.stack.length - f); | ||
| } | ||
| this.stack.push(state); | ||
| this.cursor = this.stack.length - 1; | ||
| this._statePushed = true; | ||
| Platform.flush(); | ||
| }, | ||
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| back: function() { | ||
| this._cursor--; | ||
| }, | ||
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| forward: function() { | ||
| this._cursor++; | ||
| }, | ||
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| _cursorChanged: function() { | ||
| this.cursor = Math.max(0, Math.min(this._cursor, | ||
| this.stack.length-1)); | ||
| }, | ||
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| cursorChanged: function(old) { | ||
| //console.log('cursorChanged', this.cursor, this._statePushed); | ||
| this._cursor = this.cursor; | ||
| if (!this._statePushed) { | ||
| var state = this.stack[this.cursor]; | ||
| this.fire('state-change', {state: state}); | ||
| } else { | ||
| this._statePushed = false; | ||
| } | ||
| var first = this.isAtFirst(), last = this.isAtLast(); | ||
| this.canBack = !first; | ||
| this.canForward = !last; | ||
| if (first) { | ||
| this.fire('first-state'); | ||
| } else if (last) { | ||
| this.fire('last-state'); | ||
| } | ||
| }, | ||
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| isAtLast: function() { | ||
| return (this.cursor === this.stack.length -1) | ||
| }, | ||
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| isAtFirst: function() { | ||
| return (this.cursor === 0) | ||
| } | ||
|
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| }); | ||
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| </script> | ||
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| </polymer-element> |