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Add undo and redo to annotations. (#4482)
* Add undo & redo for annotations. (#4370, #4371) * Scale the drawing when saving history. (#4370) * Scale once and disable reset button. (#4370, #4371, #4453) * Replace switch with if-else. (#4370, #4371) * Prevent decimals from zoom or DPI scaling. (#4370, #4371) * Use more CSS and less svg files. (#4370, #4371)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| const { Selection } = require("../../../shared/selection"); | ||
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|
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| exports.EditorHistory = class { | ||
| constructor(devicePixelRatio) { | ||
| this.beforeEdits = []; | ||
| this.afterEdits = []; | ||
| this.devicePixelRatio = devicePixelRatio; | ||
| } | ||
|
|
||
| push(canvas, area, recordType) { | ||
| const record = new EditRecord( | ||
| canvas, | ||
| area, | ||
| this.devicePixelRatio, | ||
| recordType | ||
| ); | ||
| this.beforeEdits.push(record); | ||
| this.afterEdits = []; | ||
| } | ||
|
|
||
| pushDiff(canvas, area) { | ||
| this.push(canvas, area, RecordType.DIFF); | ||
| } | ||
|
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| pushFrame(canvas, area) { | ||
| this.push(canvas, area, RecordType.FRAME); | ||
| } | ||
|
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| canUndo() { | ||
| return !!this.beforeEdits.length; | ||
| } | ||
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| undo(canvasBeforeUndo) { | ||
| if (!this.canUndo()) { | ||
| return null; | ||
| } | ||
|
|
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| return this._replay(canvasBeforeUndo, this.beforeEdits, this.afterEdits); | ||
| } | ||
|
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| canRedo() { | ||
| return !!this.afterEdits.length; | ||
| } | ||
|
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| redo(canvasBeforeRedo) { | ||
| if (!this.canRedo()) { | ||
| return null; | ||
| } | ||
|
|
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| return this._replay(canvasBeforeRedo, this.afterEdits, this.beforeEdits); | ||
| } | ||
|
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||
| _replay(canvasBeforeChange, from, to) { | ||
| const fromRecord = from.pop(); | ||
|
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||
| let area = fromRecord.area; | ||
| if (fromRecord.recordType === RecordType.FRAME) { | ||
| area = new Selection( | ||
| 0, 0, | ||
| parseInt(canvasBeforeChange.style.width, 10), | ||
| parseInt(canvasBeforeChange.style.height, 10) | ||
| ); | ||
| } | ||
|
|
||
| const toRecord = new EditRecord( | ||
| canvasBeforeChange, | ||
| area, | ||
| this.devicePixelRatio, | ||
| fromRecord.recordType | ||
| ); | ||
|
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| to.push(toRecord); | ||
|
|
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| return fromRecord; | ||
| } | ||
| }; | ||
|
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| class EditRecord { | ||
| constructor(canvas, area, devicePixelRatio, recordType) { | ||
| this.area = area; | ||
| this.recordType = recordType; | ||
| this.canvas = this.captureCanvas(canvas, area, devicePixelRatio, recordType); | ||
| } | ||
|
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| captureCanvas(canvas, area, devicePixelRatio, recordType) { | ||
| const copy = document.createElement("canvas"); | ||
|
|
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| if (recordType === RecordType.FRAME) { | ||
| copy.width = canvas.width; | ||
| copy.height = canvas.height; | ||
| const copyContext = copy.getContext("2d"); | ||
| copyContext.scale(devicePixelRatio, devicePixelRatio); | ||
| copyContext.drawImage( | ||
| canvas, | ||
| 0, 0, canvas.width, canvas.height, | ||
| 0, 0, area.width, area.height); | ||
| return copy; | ||
| } | ||
|
|
||
| copy.width = area.width * devicePixelRatio; | ||
| copy.height = area.height * devicePixelRatio; | ||
| const copyContext = copy.getContext("2d"); | ||
| copyContext.scale(devicePixelRatio, devicePixelRatio); | ||
| copyContext.drawImage( | ||
| canvas, | ||
| area.left * devicePixelRatio, | ||
| area.top * devicePixelRatio, | ||
| area.width * devicePixelRatio, | ||
| area.height * devicePixelRatio, | ||
| 0, 0, area.width, area.height | ||
| ); | ||
|
|
||
| return copy; | ||
| } | ||
| } | ||
|
|
||
| const RecordType = { DIFF: 0, FRAME: 1 }; | ||
| exports.RecordType = RecordType; |
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