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| # CHANGELOG | ||
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| ## 1.4.0 (2022-04-29) | ||
| * add `DrawingViewState` containing all the needed information to draw image on canvas | ||
| * bump Kotlin to 1.6.21, Gradle plugin to 7.1.3 | ||
| * bump buildToolsVersion to 32.0.0, compileSdkVersion and targetSdkVersion to 32 | ||
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| ## 1.3.0 (2020-08-05) | ||
| * bump Gradle plugin to 7.0.0 | ||
| * update publish scripts | ||
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| ## 1.2.0 (2021-03-24) | ||
| * add `undoAll()`, `redoAll()`, `clearRedoHistory()`, `isDrawingEmpty()` | ||
| * add explicit callbacks parameter names to `listenerEmptyState` and `listenerDrawingInProgress` | ||
| * add option to define canvas colour | ||
| * remove reference to additional canvas | ||
| * better documentation of public methods and parameters | ||
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| ## 1.1.0 (2021-03-23) | ||
| * add `sizeChanged` flag to determine when to create new canvas instead of creating it from | ||
| bitmap on every size change | ||
| * bump Kotlin to 1.4.31, Gradle plugin to 4.1.3, Build tools to 30.0.3 | ||
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| ## 1.0.2 (2020-12-05) | ||
| * add documentation | ||
| * remove deprecated Kotlin extensions from example app | ||
| * bump to Kotlin 1.4.20 and Gradle plugin 4.1.1 | ||
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| ## 1.0.1 (2020-08-24) | ||
| * add license | ||
| * bump Kotlin to 1.4.0, Gradle plugin to 4.0.1 and build tools to 30.0.2 | ||
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| ## 1.0.0 (2020-05-26) | ||
| * initial public release |
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85
drawingview/src/main/kotlin/com/vojtkovszky/drawingview/DrawingViewState.kt
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| package com.vojtkovszky.drawingview | ||
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| import android.graphics.Paint | ||
| import android.graphics.Path | ||
| import java.io.Serializable | ||
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| /** | ||
| * Class holding all the necessary information required to draw paths and paints | ||
| * on the canvas. | ||
| */ | ||
| class DrawingViewState: Serializable { | ||
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| private val drawPathHistory = mutableListOf<Path>() | ||
| private val drawPaintHistory = mutableListOf<Paint>() | ||
| private val undonePaths = mutableListOf<Path>() | ||
| private val undonePaints = mutableListOf<Paint>() | ||
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| // add path and paint to history | ||
| internal fun addToHistory(path: Path, paint: Paint) { | ||
| drawPathHistory.add(path) | ||
| drawPaintHistory.add(Paint(paint)) | ||
| } | ||
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| // clears redo history by cleaning undone paths and paints | ||
| internal fun clearRedoHistory() { | ||
| undonePaths.clear() | ||
| undonePaints.clear() | ||
| } | ||
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| // return single path from history on index | ||
| internal fun getPathFromHistory(index: Int): Path { | ||
| return drawPathHistory[index] | ||
| } | ||
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| // return single paint from history on index | ||
| internal fun getPaintFromHistory(index: Int): Paint { | ||
| return drawPaintHistory[index] | ||
| } | ||
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| // return number of available undone steps | ||
| internal fun numUndoneSteps(): Int { | ||
| return undonePaths.size | ||
| } | ||
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| // return number of available history steps | ||
| internal fun numHistorySteps(): Int { | ||
| return drawPathHistory.size | ||
| } | ||
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| // moves latest path and pant from undone list to history list | ||
| // by removing from undone list and adding to history list | ||
| internal fun redo() { | ||
| drawPathHistory.add(undonePaths.removeAt(undonePaths.size - 1)) | ||
| drawPaintHistory.add(undonePaints.removeAt(undonePaints.size - 1)) | ||
| } | ||
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| // reset the history and undone lists | ||
| internal fun startNew() { | ||
| drawPathHistory.clear() | ||
| drawPaintHistory.clear() | ||
| undonePaths.clear() | ||
| undonePaints.clear() | ||
| } | ||
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| // moves latest path and pant from history list to undone list | ||
| // by removing from history list and adding to undone list | ||
| internal fun undo() { | ||
| undonePaths.add(drawPathHistory.removeAt(drawPathHistory.size - 1)) | ||
| undonePaints.add(drawPaintHistory.removeAt(drawPaintHistory.size - 1)) | ||
| } | ||
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| /** | ||
| * Determine if we have any paths or paints in history | ||
| */ | ||
| fun isHistoryEmpty(): Boolean { | ||
| return drawPathHistory.isEmpty() //&& drawPaintHistory.isEmpty() | ||
| } | ||
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| /** | ||
| * Determine if we have any paths or paints in undo history | ||
| */ | ||
| fun isUndoneEmpty(): Boolean { | ||
| return undonePaths.isEmpty() //&& undonePaints.isEmpty() | ||
| } | ||
| } |
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