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The save button is now disabled when there are no changes to save. The beforeunload dialog is now only shown when there are unsaved changes.

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This commit is contained in:
Daan Vanden Bosch 2021-04-16 15:36:42 +02:00
parent bc660b23e9
commit a823e96f68
26 changed files with 250 additions and 159 deletions
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2
observable/src/commonMain/kotlin/world/phantasmal/observable/value/AbstractDependentVal.kt
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@ -11,7 +11,7 @@ import world.phantasmal.observable.Observer
* disposables need to be managed when e.g. [map] is used.
*/
abstract class AbstractDependentVal<T>(
private val dependencies: Iterable<Val<*>>,
private vararg val dependencies: Val<*>,
) : AbstractVal<T>() {
/**
* Is either empty or has a disposable per dependency.

4
observable/src/commonMain/kotlin/world/phantasmal/observable/value/DependentVal.kt
View File

@ -4,8 +4,8 @@ package world.phantasmal.observable.value
* Val of which the value depends on 0 or more other vals.
*/
class DependentVal<T>(
dependencies: Iterable<Val<*>>,
vararg dependencies: Val<*>,
private val compute: () -> T,
) : AbstractDependentVal<T>(dependencies) {
) : AbstractDependentVal<T>(*dependencies) {
override fun computeValue(): T = compute()
}

4
observable/src/commonMain/kotlin/world/phantasmal/observable/value/FlatteningDependentVal.kt
View File

@ -9,9 +9,9 @@ import world.phantasmal.observable.Observer
* Similar to [DependentVal], except that this val's [compute] returns a val.
*/
class FlatteningDependentVal<T>(
dependencies: Iterable<Val<*>>,
vararg dependencies: Val<*>,
private val compute: () -> Val<T>,
) : AbstractDependentVal<T>(dependencies) {
) : AbstractDependentVal<T>(*dependencies) {
private var computedVal: Val<T>? = null
private var computedValObserver: Disposable? = null

10
observable/src/commonMain/kotlin/world/phantasmal/observable/value/Val.kt
View File

@ -3,8 +3,8 @@ package world.phantasmal.observable.value
import world.phantasmal.core.disposable.Disposable
import world.phantasmal.observable.Observable
import world.phantasmal.observable.Observer
import world.phantasmal.observable.value.list.ListVal
import world.phantasmal.observable.value.list.DependentListVal
import world.phantasmal.observable.value.list.ListVal
import kotlin.reflect.KProperty
/**
@ -26,10 +26,10 @@ interface Val<out T> : Observable<T> {
* @param transform called whenever this val changes
*/
fun <R> map(transform: (T) -> R): Val<R> =
DependentVal(listOf(this)) { transform(value) }
DependentVal(this) { transform(value) }
fun <R> mapToListVal(transform: (T) -> List<R>): ListVal<R> =
DependentListVal(listOf(this)) { transform(value) }
DependentListVal(this) { transform(value) }
/**
* Map a transformation function that returns a val over this val. The resulting val will change
@ -38,10 +38,10 @@ interface Val<out T> : Observable<T> {
* @param transform called whenever this val changes
*/
fun <R> flatMap(transform: (T) -> Val<R>): Val<R> =
FlatteningDependentVal(listOf(this)) { transform(value) }
FlatteningDependentVal(this) { transform(value) }
fun <R> flatMapNull(transform: (T) -> Val<R>?): Val<R?> =
FlatteningDependentVal(listOf(this)) { transform(value) ?: nullVal() }
FlatteningDependentVal(this) { transform(value) ?: nullVal() }
fun isNull(): Val<Boolean> =
map { it == null }

9
observable/src/commonMain/kotlin/world/phantasmal/observable/value/ValCreation.kt
View File

@ -40,7 +40,7 @@ fun <T1, T2, R> map(
v2: Val<T2>,
transform: (T1, T2) -> R,
): Val<R> =
DependentVal(listOf(v1, v2)) { transform(v1.value, v2.value) }
DependentVal(v1, v2) { transform(v1.value, v2.value) }
/**
* Map a transformation function over 3 vals.
@ -53,7 +53,7 @@ fun <T1, T2, T3, R> map(
v3: Val<T3>,
transform: (T1, T2, T3) -> R,
): Val<R> =
DependentVal(listOf(v1, v2, v3)) { transform(v1.value, v2.value, v3.value) }
DependentVal(v1, v2, v3) { transform(v1.value, v2.value, v3.value) }
/**
* Map a transformation function that returns a val over 2 vals. The resulting val will change when
@ -66,4 +66,7 @@ fun <T1, T2, R> flatMap(
v2: Val<T2>,
transform: (T1, T2) -> Val<R>,
): Val<R> =
FlatteningDependentVal(listOf(v1, v2)) { transform(v1.value, v2.value) }
FlatteningDependentVal(v1, v2) { transform(v1.value, v2.value) }
fun and(vararg vals: Val<Boolean>): Val<Boolean> =
DependentVal(*vals) { vals.all { it.value } }

2
observable/src/commonMain/kotlin/world/phantasmal/observable/value/list/AbstractDependentListVal.kt
View File

@ -12,7 +12,7 @@ import world.phantasmal.observable.value.Val
* This way no extra disposables need to be managed when e.g. [map] is used.
*/
abstract class AbstractDependentListVal<E>(
private val dependencies: List<Val<*>>,
private vararg val dependencies: Val<*>,
) : AbstractListVal<E>(extractObservables = null) {
private val _sizeVal = SizeVal()

2
observable/src/commonMain/kotlin/world/phantasmal/observable/value/list/AbstractListVal.kt
View File

@ -67,7 +67,7 @@ abstract class AbstractListVal<E>(
}
override fun firstOrNull(): Val<E?> =
DependentVal(listOf(this)) { value.firstOrNull() }
DependentVal(this) { value.firstOrNull() }
/**
* Does the following in the given order:

4
observable/src/commonMain/kotlin/world/phantasmal/observable/value/list/DependentListVal.kt
View File

@ -7,9 +7,9 @@ import world.phantasmal.observable.value.Val
* ListVal of which the value depends on 0 or more other vals.
*/
class DependentListVal<E>(
dependencies: List<Val<*>>,
vararg dependencies: Val<*>,
private val computeElements: () -> List<E>,
) : AbstractDependentListVal<E>(dependencies) {
) : AbstractDependentListVal<E>(*dependencies) {
private var _elements: List<E>? = null
override val elements: List<E> get() = _elements.unsafeAssertNotNull()

4
observable/src/commonMain/kotlin/world/phantasmal/observable/value/list/FlatteningDependentListVal.kt
View File

@ -8,9 +8,9 @@ import world.phantasmal.observable.value.Val
* Similar to [DependentListVal], except that this val's [computeElements] returns a ListVal.
*/
class FlatteningDependentListVal<E>(
dependencies: List<Val<*>>,
vararg dependencies: Val<*>,
private val computeElements: () -> ListVal<E>,
) : AbstractDependentListVal<E>(dependencies) {
) : AbstractDependentListVal<E>(*dependencies) {
private var computedVal: ListVal<E>? = null
private var computedValObserver: Disposable? = null

5
observable/src/commonMain/kotlin/world/phantasmal/observable/value/list/ListVal.kt
View File

@ -23,6 +23,9 @@ interface ListVal<out E> : Val<List<E>> {
fun <R> fold(initialValue: R, operation: (R, E) -> R): Val<R> =
FoldedVal(this, initialValue, operation)
fun all(predicate: (E) -> Boolean): Val<Boolean> =
fold(true) { acc, el -> acc && predicate(el) }
fun sumBy(selector: (E) -> Int): Val<Int> =
fold(0) { acc, el -> acc + selector(el) }
@ -30,4 +33,6 @@ interface ListVal<out E> : Val<List<E>> {
FilteredListVal(this, predicate)
fun firstOrNull(): Val<E?>
operator fun contains(element: @UnsafeVariance E): Boolean = element in value
}

2
observable/src/commonMain/kotlin/world/phantasmal/observable/value/list/ListValCreation.kt
View File

@ -18,4 +18,4 @@ fun <T1, T2, R> flatMapToList(
v2: Val<T2>,
transform: (T1, T2) -> ListVal<R>,
): ListVal<R> =
FlatteningDependentListVal(listOf(v1, v2)) { transform(v1.value, v2.value) }
FlatteningDependentListVal(v1, v2) { transform(v1.value, v2.value) }

4
observable/src/commonTest/kotlin/world/phantasmal/observable/value/DependentValTests.kt
View File

@ -4,7 +4,7 @@ class DependentValTests : RegularValTests {
override fun createProvider() = object : ValTests.Provider {
val v = SimpleVal(0)
override val observable = DependentVal(listOf(v)) { 2 * v.value }
override val observable = DependentVal(v) { 2 * v.value }
override fun emit() {
v.value += 2
@ -13,6 +13,6 @@ class DependentValTests : RegularValTests {
override fun <T> createWithValue(value: T): DependentVal<T> {
val v = SimpleVal(value)
return DependentVal(listOf(v)) { v.value }
return DependentVal(v) { v.value }
}
}

6
observable/src/commonTest/kotlin/world/phantasmal/observable/value/FlatteningDependentValDependentValEmitsTests.kt
View File

@ -11,7 +11,7 @@ class FlatteningDependentValDependentValEmitsTests : RegularValTests {
override fun createProvider() = object : ValTests.Provider {
val v = SimpleVal(StaticVal(5))
override val observable = FlatteningDependentVal(listOf(v)) { v.value }
override val observable = FlatteningDependentVal(v) { v.value }
override fun emit() {
v.value = StaticVal(v.value.value + 5)
@ -20,7 +20,7 @@ class FlatteningDependentValDependentValEmitsTests : RegularValTests {
override fun <T> createWithValue(value: T): FlatteningDependentVal<T> {
val v = StaticVal(StaticVal(value))
return FlatteningDependentVal(listOf(v)) { v.value }
return FlatteningDependentVal(v) { v.value }
}
/**
@ -30,7 +30,7 @@ class FlatteningDependentValDependentValEmitsTests : RegularValTests {
@Test
fun emits_a_change_when_its_direct_val_dependency_changes() = test {
val v = SimpleVal(SimpleVal(7))
val fv = FlatteningDependentVal(listOf(v)) { v.value }
val fv = FlatteningDependentVal(v) { v.value }
var observedValue: Int? = null
disposer.add(

4
observable/src/commonTest/kotlin/world/phantasmal/observable/value/FlatteningDependentValNestedValEmitsTests.kt
View File

@ -7,7 +7,7 @@ class FlatteningDependentValNestedValEmitsTests : RegularValTests {
override fun createProvider() = object : ValTests.Provider {
val v = StaticVal(SimpleVal(5))
override val observable = FlatteningDependentVal(listOf(v)) { v.value }
override val observable = FlatteningDependentVal(v) { v.value }
override fun emit() {
v.value.value += 5
@ -16,6 +16,6 @@ class FlatteningDependentValNestedValEmitsTests : RegularValTests {
override fun <T> createWithValue(value: T): FlatteningDependentVal<T> {
val v = StaticVal(StaticVal(value))
return FlatteningDependentVal(listOf(v)) { v.value }
return FlatteningDependentVal(v) { v.value }
}
}

2
observable/src/commonTest/kotlin/world/phantasmal/observable/value/list/DependentListValTests.kt
View File

@ -4,7 +4,7 @@ class DependentListValTests : ListValTests {
override fun createProvider() = object : ListValTests.Provider {
private val l = SimpleListVal<Int>(mutableListOf())
override val observable = DependentListVal(listOf(l)) { l.value.map { 2 * it } }
override val observable = DependentListVal(l) { l.value.map { 2 * it } }
override fun addElement() {
l.add(4)

2
observable/src/commonTest/kotlin/world/phantasmal/observable/value/list/FlatteningDependentListValDependentValEmitsTests.kt
View File

@ -14,7 +14,7 @@ class FlatteningDependentListValDependentValEmitsTests : ListValTests {
private val dependencyVal = SimpleVal<ListVal<Int>>(nestedVal)
override val observable =
FlatteningDependentListVal(listOf(dependencyVal)) { dependencyVal.value }
FlatteningDependentListVal(dependencyVal) { dependencyVal.value }
override fun addElement() {
// Update the direct dependency.

2
observable/src/commonTest/kotlin/world/phantasmal/observable/value/list/FlatteningDependentListValNestedValEmitsTests.kt
View File

@ -14,7 +14,7 @@ class FlatteningDependentListValNestedValEmitsTests : ListValTests {
private val dependentVal = StaticVal<ListVal<Int>>(nestedVal)
override val observable =
FlatteningDependentListVal(listOf(dependentVal)) { dependentVal.value }
FlatteningDependentListVal(dependentVal) { dependentVal.value }
override fun addElement() {
// Update the nested dependency.

57
web/src/main/kotlin/world/phantasmal/web/core/undo/SimpleUndo.kt
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@ -1,57 +0,0 @@
package world.phantasmal.web.core.undo
import world.phantasmal.observable.value.*
import world.phantasmal.web.core.actions.Action
/**
* Simply contains a single action. [canUndo] and [canRedo] must be managed manually.
*/
class SimpleUndo(
undoManager: UndoManager,
private val description: String,
undo: () -> Unit,
redo: () -> Unit,
) : Undo {
private val action = object : Action {
override val description: String = this@SimpleUndo.description
override fun execute() {
redo()
}
override fun undo() {
undo()
}
}
override val canUndo: MutableVal<Boolean> = mutableVal(false)
override val canRedo: MutableVal<Boolean> = mutableVal(false)
override val firstUndo: Val<Action?> = canUndo.map { if (it) action else null }
override val firstRedo: Val<Action?> = canRedo.map { if (it) action else null }
init {
undoManager.addUndo(this)
}
override fun undo(): Boolean =
if (canUndo.value) {
action.undo()
true
} else {
false
}
override fun redo(): Boolean =
if (canRedo.value) {
action.execute()
true
} else {
false
}
override fun reset() {
canUndo.value = false
canRedo.value = false
}
}

14
web/src/main/kotlin/world/phantasmal/web/core/undo/Undo.kt
View File

@ -17,7 +17,21 @@ interface Undo {
*/
val firstRedo: Val<Action?>
/**
* True if this undo is at the point in time where the last save happened. See [savePoint].
* If false, it should be safe to leave the application because no changes have happened since
* the last save point (either because there were no changes or all changes have been undone).
*/
val atSavePoint: Val<Boolean>
fun undo(): Boolean
fun redo(): Boolean
/**
* Called when a save happens, the undo should remember this point in time and reflect whether
* it's currently at this point in [atSavePoint].
*/
fun savePoint()
fun reset()
}

31
web/src/main/kotlin/world/phantasmal/web/core/undo/UndoManager.kt
View File

@ -1,13 +1,11 @@
package world.phantasmal.web.core.undo
import world.phantasmal.observable.value.Val
import world.phantasmal.observable.value.falseVal
import world.phantasmal.observable.value.mutableVal
import world.phantasmal.observable.value.nullVal
import world.phantasmal.observable.value.*
import world.phantasmal.observable.value.list.mutableListVal
import world.phantasmal.web.core.actions.Action
class UndoManager {
private val undos = mutableListOf<Undo>(NopUndo)
private val undos = mutableListVal<Undo>(NopUndo) { arrayOf(it.atSavePoint) }
private val _current = mutableVal<Undo>(NopUndo)
val current: Val<Undo> = _current
@ -17,6 +15,12 @@ class UndoManager {
val firstUndo: Val<Action?> = current.flatMap { it.firstUndo }
val firstRedo: Val<Action?> = current.flatMap { it.firstRedo }
/**
* True if all undos are at the most recent save point. I.e., true if there are no changes to
* save.
*/
val allAtSavePoint: Val<Boolean> = undos.all { it.atSavePoint.value }
fun addUndo(undo: Undo) {
undos.add(undo)
}
@ -37,26 +41,35 @@ class UndoManager {
fun redo(): Boolean =
current.value.redo()
/**
* Sets a save point on all undos.
*/
fun savePoint() {
undos.value.forEach { it.savePoint() }
}
/**
* Resets all managed undos.
*/
fun reset() {
undos.forEach { it.reset() }
undos.value.forEach { it.reset() }
}
fun anyCanUndo(): Boolean =
undos.any { it.canUndo.value }
private object NopUndo : Undo {
override val canUndo = falseVal()
override val canRedo = falseVal()
override val firstUndo = nullVal()
override val firstRedo = nullVal()
override val atSavePoint = trueVal()
override fun undo(): Boolean = false
override fun redo(): Boolean = false
override fun savePoint() {
// Do nothing.
}
override fun reset() {
// Do nothing.
}

21
web/src/main/kotlin/world/phantasmal/web/core/undo/UndoStack.kt
View File

@ -1,10 +1,7 @@
package world.phantasmal.web.core.undo
import world.phantasmal.observable.value.Val
import world.phantasmal.observable.value.gt
import world.phantasmal.observable.value.*
import world.phantasmal.observable.value.list.mutableListVal
import world.phantasmal.observable.value.map
import world.phantasmal.observable.value.mutableVal
import world.phantasmal.web.core.actions.Action
/**
@ -18,12 +15,9 @@ class UndoStack(manager: UndoManager) : Undo {
* action that will be redone when calling [redo].
*/
private val index = mutableVal(0)
private val savePointIndex = mutableVal(0)
private var undoingOrRedoing = false
init {
manager.addUndo(this)
}
override val canUndo: Val<Boolean> = index gt 0
override val canRedo: Val<Boolean> = map(stack, index) { stack, index -> index < stack.size }
@ -32,6 +26,12 @@ class UndoStack(manager: UndoManager) : Undo {
override val firstRedo: Val<Action?> = index.map { stack.value.getOrNull(it) }
override val atSavePoint: Val<Boolean> = index eq savePointIndex
init {
manager.addUndo(this)
}
fun push(action: Action): Action {
if (!undoingOrRedoing) {
stack.splice(index.value, stack.value.size - index.value, action)
@ -67,8 +67,13 @@ class UndoStack(manager: UndoManager) : Undo {
}
}
override fun savePoint() {
savePointIndex.value = index.value
}
override fun reset() {
stack.clear()
index.value = 0
savePointIndex.value = 0
}
}

6
web/src/main/kotlin/world/phantasmal/web/questEditor/QuestEditor.kt
View File

@ -79,11 +79,11 @@ class QuestEditor(
val entityImageRenderer =
addDisposable(EntityImageRenderer(entityAssetLoader, createThreeRenderer))
// When the user tries to leave and there's something on any of the undo stacks, ask whether
// the user really wants to leave.
// When the user tries to leave and there are unsaved changes, ask whether the user really
// wants to leave.
addDisposable(
window.disposableListener("beforeunload", { e: BeforeUnloadEvent ->
if (undoManager.anyCanUndo()) {
if (!undoManager.allAtSavePoint.value) {
e.preventDefault()
e.returnValue = "false"
}

10
web/src/main/kotlin/world/phantasmal/web/questEditor/controllers/QuestEditorToolbarController.kt
View File

@ -64,7 +64,11 @@ class QuestEditorToolbarController(
// Saving
val saveEnabled: Val<Boolean> =
savingEnabled and files.notEmpty and BrowserFeatures.fileSystemApi
and(
savingEnabled,
questEditorStore.canSaveChanges,
files.notEmpty
) and BrowserFeatures.fileSystemApi
val saveTooltip: Val<String> = value(
if (BrowserFeatures.fileSystemApi) "Save changes (Ctrl-S)"
else "This browser doesn't support saving to an existing file"
@ -235,6 +239,8 @@ class QuestEditorToolbarController(
binFile.writeBuffer(bin)
datFile.writeBuffer(dat)
}
questEditorStore.questSaved()
} catch (e: Throwable) {
setResult(
PwResult.build<Nothing>(logger)
@ -297,6 +303,8 @@ class QuestEditorToolbarController(
URL.revokeObjectURL(url)
document.body?.removeChild(a)
}
questEditorStore.questSaved()
} catch (e: Throwable) {
setResult(
PwResult.build<Nothing>(logger)

55
web/src/main/kotlin/world/phantasmal/web/questEditor/stores/AsmStore.kt
View File

@ -6,18 +6,16 @@ import world.phantasmal.core.disposable.Disposer
import world.phantasmal.core.disposable.disposable
import world.phantasmal.lib.asm.assemble
import world.phantasmal.lib.asm.disassemble
import world.phantasmal.observable.ChangeEvent
import world.phantasmal.observable.Observable
import world.phantasmal.observable.emitter
import world.phantasmal.observable.value.Val
import world.phantasmal.observable.value.list.ListVal
import world.phantasmal.observable.value.mutableVal
import world.phantasmal.web.core.undo.SimpleUndo
import world.phantasmal.web.core.undo.UndoManager
import world.phantasmal.web.externals.monacoEditor.*
import world.phantasmal.web.questEditor.asm.AsmAnalyser
import world.phantasmal.web.questEditor.asm.monaco.*
import world.phantasmal.web.questEditor.models.QuestModel
import world.phantasmal.web.questEditor.undo.TextModelUndo
import world.phantasmal.web.shared.messages.AsmChange
import world.phantasmal.web.shared.messages.AsmRange
import world.phantasmal.web.shared.messages.AssemblyProblem
@ -42,14 +40,7 @@ class AsmStore(
*/
private val modelDisposer = addDisposable(Disposer())
private val _didUndo = emitter<Unit>()
private val _didRedo = emitter<Unit>()
private val undo = SimpleUndo(
undoManager,
"Script edits",
{ _didUndo.emit(ChangeEvent(Unit)) },
{ _didRedo.emit(ChangeEvent(Unit)) },
)
private val undo = addDisposable(TextModelUndo(undoManager, "Script edits", _textModel))
val inlineStackArgs: Val<Boolean> = _inlineStackArgs
@ -57,8 +48,8 @@ class AsmStore(
val editingEnabled: Val<Boolean> = questEditorStore.questEditingEnabled
val didUndo: Observable<Unit> = _didUndo
val didRedo: Observable<Unit> = _didRedo
val didUndo: Observable<Unit> = undo.didUndo
val didRedo: Observable<Unit> = undo.didRedo
val problems: ListVal<AssemblyProblem> = asmAnalyser.problems
@ -134,8 +125,6 @@ class AsmStore(
_textModel.value = createModel(asm.joinToString("\n"), ASM_LANG_ID).also { model ->
modelDisposer.add(disposable { model.dispose() })
setupUndoRedo(model)
model.onDidChangeContent { e ->
asmAnalyser.updateAsm(e.changes.map {
AsmChange(
@ -168,42 +157,6 @@ class AsmStore(
?.let(quest::setBytecodeIr)
}
private fun setupUndoRedo(model: ITextModel) {
val initialVersion = model.getAlternativeVersionId()
var currentVersion = initialVersion
var lastVersion = initialVersion
model.onDidChangeContent {
val version = model.getAlternativeVersionId()
if (version < currentVersion) {
// Undoing.
undo.canRedo.value = true
if (version == initialVersion) {
undo.canUndo.value = false
}
} else {
// Redoing.
if (version <= lastVersion) {
if (version == lastVersion) {
undo.canRedo.value = false
}
} else {
undo.canRedo.value = false
if (currentVersion > lastVersion) {
lastVersion = currentVersion
}
}
undo.canUndo.value = true
}
currentVersion = version
}
}
companion object {
private val asmAnalyser = AsmAnalyser()

5
web/src/main/kotlin/world/phantasmal/web/questEditor/stores/QuestEditorStore.kt
View File

@ -58,6 +58,7 @@ class QuestEditorStore(
val firstUndo: Val<Action?> = undoManager.firstUndo
val canRedo: Val<Boolean> = questEditingEnabled and undoManager.canRedo
val firstRedo: Val<Action?> = undoManager.firstRedo
val canSaveChanges: Val<Boolean> = !undoManager.allAtSavePoint
val showCollisionGeometry: Val<Boolean> = _showCollisionGeometry
@ -233,4 +234,8 @@ class QuestEditorStore(
fun setShowCollisionGeometry(show: Boolean) {
_showCollisionGeometry.value = show
}
fun questSaved() {
undoManager.savePoint()
}
}

142
web/src/main/kotlin/world/phantasmal/web/questEditor/undo/TextModelUndo.kt Normal file
View File

@ -0,0 +1,142 @@
package world.phantasmal.web.questEditor.undo
import world.phantasmal.core.disposable.Disposable
import world.phantasmal.core.disposable.TrackedDisposable
import world.phantasmal.observable.ChangeEvent
import world.phantasmal.observable.Observable
import world.phantasmal.observable.emitter
import world.phantasmal.observable.value.MutableVal
import world.phantasmal.observable.value.Val
import world.phantasmal.observable.value.eq
import world.phantasmal.observable.value.mutableVal
import world.phantasmal.web.core.actions.Action
import world.phantasmal.web.core.undo.Undo
import world.phantasmal.web.core.undo.UndoManager
import world.phantasmal.web.externals.monacoEditor.IDisposable
import world.phantasmal.web.externals.monacoEditor.ITextModel
class TextModelUndo(
undoManager: UndoManager,
private val description: String,
model: Val<ITextModel?>,
) : Undo, TrackedDisposable() {
private val action = object : Action {
override val description: String = this@TextModelUndo.description
override fun execute() {
_didRedo.emit(ChangeEvent(Unit))
}
override fun undo() {
_didUndo.emit(ChangeEvent(Unit))
}
}
private val modelObserver: Disposable
private var modelChangeObserver: IDisposable? = null
private val _canUndo: MutableVal<Boolean> = mutableVal(false)
private val _canRedo: MutableVal<Boolean> = mutableVal(false)
private val _didUndo = emitter<Unit>()
private val _didRedo = emitter<Unit>()
private val currentVersionId = mutableVal<Int?>(null)
private val savePointVersionId = mutableVal<Int?>(null)
override val canUndo: Val<Boolean> = _canUndo
override val canRedo: Val<Boolean> = _canRedo
override val firstUndo: Val<Action?> = canUndo.map { if (it) action else null }
override val firstRedo: Val<Action?> = canRedo.map { if (it) action else null }
override val atSavePoint: Val<Boolean> = savePointVersionId eq currentVersionId
val didUndo: Observable<Unit> = _didUndo
val didRedo: Observable<Unit> = _didRedo
init {
undoManager.addUndo(this)
modelObserver = model.observe(callNow = true) { onModelChange(it.value) }
}
override fun dispose() {
modelChangeObserver?.dispose()
modelObserver.dispose()
super.dispose()
}
private fun onModelChange(model: ITextModel?) {
modelChangeObserver?.dispose()
if (model == null) {
reset()
return
}
_canUndo.value = false
_canRedo.value = false
val initialVersionId = model.getAlternativeVersionId()
currentVersionId.value = initialVersionId
savePointVersionId.value = initialVersionId
var lastVersionId = initialVersionId
modelChangeObserver = model.onDidChangeContent {
val versionId = model.getAlternativeVersionId()
val prevVersionId = currentVersionId.value!!
if (versionId < prevVersionId) {
// Undoing.
_canRedo.value = true
if (versionId == initialVersionId) {
_canUndo.value = false
}
} else {
// Redoing.
if (versionId <= lastVersionId) {
if (versionId == lastVersionId) {
_canRedo.value = false
}
} else {
_canRedo.value = false
if (prevVersionId > lastVersionId) {
lastVersionId = prevVersionId
}
}
_canUndo.value = true
}
currentVersionId.value = versionId
}
}
override fun undo(): Boolean =
if (canUndo.value) {
action.undo()
true
} else {
false
}
override fun redo(): Boolean =
if (canRedo.value) {
action.execute()
true
} else {
false
}
override fun savePoint() {
savePointVersionId.value = currentVersionId.value
}
override fun reset() {
_canUndo.value = false
_canRedo.value = false
currentVersionId.value = null
savePointVersionId.value = null
}
}