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using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Cadenza.Collections;
using Xamarin.PropertyEditing.Common;
using Xamarin.PropertyEditing.Drawing;
namespace Xamarin.PropertyEditing.ViewModels
{
internal abstract class PropertiesViewModel
: NotifyingObject, INotifyDataErrorInfo
{
public PropertiesViewModel (TargetPlatform targetPlatform)
{
if (targetPlatform == null)
throw new ArgumentNullException (nameof(targetPlatform));
TargetPlatform = targetPlatform;
this.selectedObjects.CollectionChanged += OnSelectedObjectsChanged;
}
public event EventHandler<DataErrorsChangedEventArgs> ErrorsChanged;
/// <remarks>Consumers should check for <see cref="INotifyCollectionChanged"/> and hook appropriately.</remarks>
public IReadOnlyList<EditorViewModel> Properties => this.editors;
public IReadOnlyList<EventViewModel> Events => this.events;
public ICollection<object> SelectedObjects => this.selectedObjects;
public string TypeName
{
get { return this.typeName; }
private set
{
if (this.typeName == value)
return;
this.typeName = value;
OnPropertyChanged ();
}
}
public bool IsObjectNameable => this.nameable != null;
public bool IsObjectNameReadOnly
{
get { return this.nameReadOnly; }
private set
{
if (this.nameReadOnly == value)
return;
this.nameReadOnly = value;
OnPropertyChanged ();
}
}
public string ObjectName
{
get { return this.objectName; }
set
{
if (this.objectName == value)
return;
SetObjectName (value);
}
}
public bool EventsEnabled
{
get { return this.eventsEnabled; }
private set
{
if (this.eventsEnabled == value)
return;
this.eventsEnabled = value;
OnPropertyChanged ();
}
}
public TargetPlatform TargetPlatform
{
get;
}
public bool HasErrors => this.errors.IsValueCreated && this.errors.Value.Count > 0;
public IEnumerable GetErrors (string propertyName)
{
if (!this.errors.IsValueCreated)
return Enumerable.Empty<string> ();
string error;
if (this.errors.Value.TryGetValue (propertyName, out error))
return new[] { error };
return Enumerable.Empty<string> ();
}
public PropertyViewModel<T> GetKnownPropertyViewModel<T> (KnownProperty<T> property)
{
if (property == null)
throw new ArgumentNullException (nameof (property));
if (this.knownEditors == null)
throw new InvalidOperationException ("Querying for known properties before they've been setup");
if (!this.knownEditors.TryGetValue (property, out EditorViewModel model))
throw new KeyNotFoundException ();
var vm = model as PropertyViewModel<T>;
if (vm == null)
throw new InvalidOperationException ("KnownProperty doesn't return expected property view model type");
return vm;
}
protected IReadOnlyList<IObjectEditor> ObjectEditors => this.objEditors;
/// <param name="newError">The error message or <c>null</c> to clear the error.</param>
protected void SetError (string property, string newError)
{
if (this.errors.IsValueCreated) {
string prevError;
if (this.errors.Value.TryGetValue (property, out prevError)) {
if (prevError == newError)
return;
}
}
if (newError == null)
this.errors.Value.Remove (property);
else
this.errors.Value[property] = newError;
OnErrorsChanged (new DataErrorsChangedEventArgs (property));
}
// TODO: Consider having the property hooks at the top level and a map of IPropertyInfo -> PropertyViewModel
// the hash lookup would be likely faster than doing a property info compare in every property and would
// reduce the number event attach/detatches
protected virtual async void OnSelectedObjectsChanged (object sender, NotifyCollectionChangedEventArgs e)
{
var tcs = new TaskCompletionSource<bool> ();
var existingTask = Interlocked.Exchange (ref this.busyTask, tcs.Task);
if (existingTask != null)
await existingTask;
IObjectEditor[] newEditors = null;
IObjectEditor[] removedEditors = null;
switch (e.Action) {
case NotifyCollectionChangedAction.Add: {
newEditors = await AddEditorsAsync (e.NewItems);
break;
}
case NotifyCollectionChangedAction.Remove:
removedEditors = new IObjectEditor[e.OldItems.Count];
for (int i = 0; i < e.OldItems.Count; i++) {
IObjectEditor editor = this.objEditors.First (oe => oe?.Target == e.OldItems[i]);
INotifyCollectionChanged notifier = editor.Properties as INotifyCollectionChanged;
if (notifier != null)
notifier.CollectionChanged -= OnObjectEditorPropertiesChanged;
removedEditors[i] = editor;
this.objEditors.Remove (editor);
}
break;
case NotifyCollectionChangedAction.Replace:
case NotifyCollectionChangedAction.Move:
case NotifyCollectionChangedAction.Reset: {
removedEditors = new IObjectEditor[this.objEditors.Count];
for (int i = 0; i < removedEditors.Length; i++) {
removedEditors[i] = this.objEditors[i];
INotifyCollectionChanged notifier = removedEditors[i]?.Properties as INotifyCollectionChanged;
if (notifier != null)
notifier.CollectionChanged -= OnObjectEditorPropertiesChanged;
}
this.objEditors.Clear ();
newEditors = await AddEditorsAsync (this.selectedObjects);
break;
}
}
await UpdateMembersAsync (removedEditors, newEditors);
tcs.SetResult (true);
}
protected virtual void OnAddEditors (IEnumerable<EditorViewModel> editors)
{
}
protected virtual void OnRemoveEditors (IEnumerable<EditorViewModel> editors)
{
}
protected virtual void OnClearProperties()
{
}
private INameableObject nameable;
private bool nameReadOnly;
private bool eventsEnabled;
private string typeName, objectName;
private BidirectionalDictionary<KnownProperty, EditorViewModel> knownEditors;
private readonly List<IObjectEditor> objEditors = new List<IObjectEditor> ();
private readonly ObservableCollectionEx<EditorViewModel> editors = new ObservableCollectionEx<EditorViewModel> ();
private readonly ObservableCollectionEx<object> selectedObjects = new ObservableCollectionEx<object> ();
private readonly ObservableCollectionEx<EventViewModel> events = new ObservableCollectionEx<EventViewModel> ();
private readonly Lazy<Dictionary<string, string>> errors = new Lazy<Dictionary<string, string>>();
private void OnErrorsChanged (DataErrorsChangedEventArgs e)
{
ErrorsChanged?.Invoke (this, e);
}
private async void OnVariationsChanged (object sender, EventArgs e)
{
using (await AsyncWork.RequestAsyncWork (this)) {
PropertyViewModel pvm = (PropertyViewModel) sender;
var variations = (await GetVariationsAsync (pvm.Property)).SelectMany (vs => vs).Distinct ();
var properties = this.editors
.OfType<PropertyViewModel> ()
.Where (evm => Equals (evm.Property, pvm.Property) && evm.Variation != null)
.ToDictionary (evm => evm.Variation);
List<PropertyViewModel> toAdd = new List<PropertyViewModel> ();
foreach (PropertyVariation variation in variations) {
if (!properties.Remove (variation)) {
toAdd.Add (GetViewModel (pvm.Property, variation));
}
}
if (properties.Count > 0) {
var toRemove = new List<PropertyViewModel> ();
foreach (var kvp in properties) {
toRemove.Add (kvp.Value);
}
RemoveProperties (toRemove);
}
if (toAdd.Count > 0)
AddProperties (toAdd);
}
}
private void AddProperties (IReadOnlyList<EditorViewModel> newEditors)
{
if (this.knownEditors != null) {
// Only properties common across obj editors will be listed, so knowns should also be common
var knownProperties = newEditors[0].Editors.First().KnownProperties;
if (knownProperties != null && knownProperties.Count > 0) {
foreach (var editorvm in newEditors) {
var prop = editorvm as PropertyViewModel;
if (prop == null)
continue;
if (knownProperties.TryGetValue (prop.Property, out KnownProperty known)) {
this.knownEditors[known] = editorvm;
}
}
}
}
this.editors.AddRange (newEditors);
OnAddEditors (newEditors);
}
private void RemoveProperties (IReadOnlyList<EditorViewModel> oldEditors)
{
if (this.knownEditors != null) {
foreach (EditorViewModel old in oldEditors) {
this.knownEditors.Inverse.Remove (old);
}
}
this.editors.RemoveRange (oldEditors);
OnRemoveEditors (oldEditors);
}
private async void SetObjectName (string value)
{
if (this.nameable == null)
return;
try {
await this.nameable.SetNameAsync (value);
} catch (Exception ex) {
AggregateException aggregate = ex as AggregateException;
if (aggregate != null) {
aggregate = aggregate.Flatten ();
ex = aggregate.InnerExceptions[0];
}
SetError (nameof(ObjectName), ex.ToString());
} finally {
SetCurrentObjectName (value, isReadonly: false);
}
}
private void SetNameable (INameableObject nameable)
{
this.nameable = nameable;
OnPropertyChanged (nameof (IsObjectNameable));
}
private void SetCurrentObjectName (string value, bool isReadonly)
{
IsObjectNameReadOnly = isReadonly;
this.objectName = value;
OnPropertyChanged (nameof (ObjectName));
}
private void ClearMembers()
{
TypeName = null;
SetNameable (null);
SetCurrentObjectName (null, isReadonly: true);
this.editors.Clear ();
this.events.Clear ();
OnClearProperties ();
}
private async Task UpdateMembersAsync (IObjectEditor[] removedEditors = null, IObjectEditor[] newEditors = null)
{
if (this.objEditors.Count == 0) {
ClearMembers ();
return;
}
IObjectEditor editor = this.objEditors[0];
Task<string> nameQuery = null;
INameableObject firstNameable = editor as INameableObject;
if (this.objEditors.Count == 1) {
nameQuery = firstNameable?.GetNameAsync ();
}
IObjectEventEditor events = editor as IObjectEventEditor;
var newEventSet = new HashSet<IEventInfo> (events?.Events ?? Enumerable.Empty<IEventInfo> ());
bool knownProperties = (editor?.KnownProperties?.Count ?? 0) > 0;
string newTypeName = editor?.TargetType.Name;
var newPropertySet = new HashSet<IPropertyInfo> (editor?.Properties ?? Enumerable.Empty<IPropertyInfo>());
for (int i = 1; i < this.objEditors.Count; i++) {
editor = this.objEditors[i];
if (editor == null)
continue;
newPropertySet.IntersectWith (editor.Properties);
if (editor is IObjectEventEditor) {
events = (IObjectEventEditor)editor;
newEventSet.IntersectWith (events.Events);
}
if (firstNameable == null)
firstNameable = editor as INameableObject;
if (newTypeName != editor.TargetType.Name)
newTypeName = String.Format (PropertyEditing.Properties.Resources.MultipleTypesSelected, this.objEditors.Count);
if (!knownProperties)
knownProperties = (editor.KnownProperties?.Count ?? 0) > 0;
}
TypeName = newTypeName;
if (knownProperties && this.knownEditors == null)
this.knownEditors = new BidirectionalDictionary<KnownProperty, EditorViewModel> ();
await UpdatePropertiesAsync (newPropertySet, removedEditors, newEditors);
EventsEnabled = events != null;
UpdateEvents (newEventSet, removedEditors, newEditors);
string name = (this.objEditors.Count > 1) ? String.Format (PropertyEditing.Properties.Resources.MultipleObjectsSelected, this.objEditors.Count) : PropertyEditing.Properties.Resources.NoName;
if (this.objEditors.Count == 1) {
string tname = nameQuery?.Result;
if (tname != null)
name = tname;
}
SetNameable (firstNameable);
SetCurrentObjectName (name, this.objEditors.Count > 1);
}
private void UpdateEvents (HashSet<IEventInfo> newSet, IObjectEditor[] removedEditors = null, IObjectEditor[] newEditors = null)
{
if (this.objEditors.Count > 1) {
this.events.Clear ();
return;
}
var toRemove = new List<EventViewModel> ();
foreach (EventViewModel vm in this.events.ToArray ()) {
if (!newSet.Remove (vm.Event)) {
toRemove.Add (vm);
vm.Editors.Clear ();
continue;
}
if (removedEditors != null) {
for (int i = 0; i < removedEditors.Length; i++)
vm.Editors.Remove (removedEditors[i]);
}
if (newEditors != null) {
for (int i = 0; i < newEditors.Length; i++)
vm.Editors.Add (newEditors[i]);
}
}
if (toRemove.Count > 0)
this.events.RemoveRange (toRemove);
if (newSet.Count > 0) {
this.events.Reset (this.events.Concat (newSet.Select (i => new EventViewModel (TargetPlatform, i, this.objEditors))).OrderBy (e => e.Event.Name).ToArray());
}
}
private async Task UpdatePropertiesAsync (HashSet<IPropertyInfo> newSet, IObjectEditor[] removedEditors = null, IObjectEditor[] newEditors = null)
{
Dictionary<IPropertyInfo, Dictionary<PropertyVariation, PropertyViewModel>> variations = null;
List<PropertyViewModel> toRemove = new List<PropertyViewModel> ();
foreach (PropertyViewModel vm in this.editors.ToArray ()) {
if (!newSet.Contains (vm.Property)) {
toRemove.Add (vm);
vm.Editors.Clear ();
continue;
}
if (!vm.HasVariations) {
newSet.Remove (vm.Property);
} else if (vm.Variation != null) {
if (variations == null)
variations = new Dictionary<IPropertyInfo, Dictionary<PropertyVariation, PropertyViewModel>> ();
if (!variations.TryGetValue (vm.Property, out Dictionary<PropertyVariation, PropertyViewModel> variantVms))
variations[vm.Property] = variantVms = new Dictionary<PropertyVariation, PropertyViewModel> ();
variantVms.Add (vm.Variation, vm);
}
if (removedEditors != null) {
for (int i = 0; i < removedEditors.Length; i++)
vm.Editors.Remove (removedEditors[i]);
}
if (newEditors != null) {
for (int i = 0; i < newEditors.Length; i++)
vm.Editors.Add (newEditors[i]);
}
}
if (toRemove.Count > 0)
RemoveProperties (toRemove);
if (newSet.Count > 0) {
toRemove = new List<PropertyViewModel> ();
List<EditorViewModel> newVms = new List<EditorViewModel> ();
foreach (IPropertyInfo property in newSet) {
if (variations != null && variations.TryGetValue (property, out Dictionary<PropertyVariation, PropertyViewModel> propertyVariations)) {
var setVariations = (await GetVariationsAsync (property)).SelectMany (vs => vs).Distinct ();
foreach (PropertyVariation variation in setVariations) {
if (propertyVariations.Remove (variation))
continue;
newVms.Add (GetViewModel (property, variation));
}
foreach (var kvp in propertyVariations) {
toRemove.Add (kvp.Value);
}
} else if (property.HasVariations()) {
newVms.AddRange (await GetViewModelsAsync (property));
} else {
newVms.Add (GetViewModel (property));
}
}
if (toRemove.Count > 0) {
RemoveProperties (toRemove);
}
AddProperties (newVms);
}
}
private async Task<IObjectEditor[]> AddEditorsAsync (IList newItems)
{
Task<IObjectEditor>[] newEditorTasks = new Task<IObjectEditor>[newItems.Count];
for (int i = 0; i < newEditorTasks.Length; i++) {
newEditorTasks[i] = TargetPlatform.EditorProvider.GetObjectEditorAsync (newItems[i]);
}
IObjectEditor[] newEditors = await Task.WhenAll (newEditorTasks);
for (int i = 0; i < newEditors.Length; i++) {
IObjectEditor editor = newEditors[i];
if (editor == null)
continue;
var notifier = editor.Properties as INotifyCollectionChanged;
if (notifier != null)
notifier.CollectionChanged += OnObjectEditorPropertiesChanged;
}
this.objEditors.AddRange (newEditors);
return newEditors;
}
private async void OnObjectEditorPropertiesChanged (object sender, NotifyCollectionChangedEventArgs e)
{
var tcs = new TaskCompletionSource<bool> ();
var existingTask = Interlocked.Exchange (ref this.busyTask, tcs.Task);
if (existingTask != null)
await existingTask;
await UpdateMembersAsync ();
tcs.SetResult (true);
}
private Task<IReadOnlyCollection<PropertyVariation>[]> GetVariationsAsync (IPropertyInfo property)
{
var variantTasks = new List<Task<IReadOnlyCollection<PropertyVariation>>> (ObjectEditors.Count);
for (int i = 0; i < ObjectEditors.Count; i++) {
variantTasks.Add (ObjectEditors[i].GetPropertyVariantsAsync (property));
}
return Task.WhenAll (variantTasks);
}
private async Task<IReadOnlyList<PropertyViewModel>> GetViewModelsAsync (IPropertyInfo property, IEnumerable<PropertyVariation> variantsToSkip = null)
{
PropertyViewModel baseVm = GetViewModel (property);
List<PropertyViewModel> vms = new List<PropertyViewModel> ();
vms.Add (baseVm);
HashSet<PropertyVariation> skipped =
(variantsToSkip != null) ? new HashSet<PropertyVariation> (variantsToSkip) : null;
if (baseVm.HasVariations) {
using (await AsyncWork.RequestAsyncWork (this)) {
var variants = await GetVariationsAsync (property);
for (int i = 0; i < variants.Length; i++) {
foreach (PropertyVariation variant in variants[i]) {
if (skipped != null && skipped.Contains (variant))
continue;
vms.Add (GetViewModel (property, variant));
}
}
}
}
return vms;
}
private PropertyViewModel GetViewModel (IPropertyInfo property, PropertyVariation variant = null)
{
PropertyViewModel vm;
Type[] interfaces = property.GetType ().GetInterfaces ();
Type hasPredefinedValues = interfaces.FirstOrDefault (t => t.IsGenericType && t.GetGenericTypeDefinition () == typeof(IHavePredefinedValues<>));
if (hasPredefinedValues != null) {
bool combinable = (bool) hasPredefinedValues.GetProperty (nameof(IHavePredefinedValues<bool>.IsValueCombinable)).GetValue (property);
Type type = combinable
? typeof(CombinablePropertyViewModel<>).MakeGenericType (hasPredefinedValues.GenericTypeArguments[0])
: typeof(PredefinedValuesViewModel<>).MakeGenericType (hasPredefinedValues.GenericTypeArguments[0]);
vm = (PropertyViewModel) Activator.CreateInstance (type, TargetPlatform, property, this.objEditors, variant);
} else if (ViewModelMap.TryGetValue (property.Type, out var vmFactory))
vm = vmFactory (TargetPlatform, property, this.objEditors, variant);
else
vm = new StringPropertyViewModel (TargetPlatform, property, this.objEditors, variant);
vm.VariationsChanged += OnVariationsChanged;
return vm;
}
private Task busyTask;
protected internal static AsyncWorkQueue AsyncWork
{
get;
} = new AsyncWorkQueue();
private static readonly Dictionary<Type, Func<TargetPlatform, IPropertyInfo, IEnumerable<IObjectEditor>, PropertyVariation, PropertyViewModel>> ViewModelMap = new Dictionary<Type, Func<TargetPlatform, IPropertyInfo, IEnumerable<IObjectEditor>, PropertyVariation, PropertyViewModel>> {
{ typeof(DateTime), (tp,p,e,v) => new PropertyViewModel<DateTime> (tp, p, e, v) },
{ typeof(TimeSpan), (tp,p,e,v) => new PropertyViewModel<TimeSpan> (tp, p, e, v) },
{ typeof(char), (tp,p,e,v) => new PropertyViewModel<char> (tp, p, e, v) },
{ typeof(string), (tp,p,e,v) => new StringPropertyViewModel (tp, p, e, v) },
{ typeof(bool), (tp,p,e,v) => new PropertyViewModel<bool?> (tp, p, e, v) },
{ typeof(float), (tp,p,e,v) => new NumericPropertyViewModel<float?> (tp, p, e, v) },
{ typeof(double), (tp,p,e,v) => new NumericPropertyViewModel<double?> (tp, p, e, v) },
{ typeof(int), (tp,p,e,v) => new NumericPropertyViewModel<int?> (tp, p, e, v) },
{ typeof(long), (tp,p,e,v) => new NumericPropertyViewModel<long?> (tp, p, e, v) },
{ typeof(CommonSolidBrush), (tp,p,e,v) => new BrushPropertyViewModel (tp, p, e, v, new[] {CommonBrushType.NoBrush, CommonBrushType.Solid, CommonBrushType.MaterialDesign, CommonBrushType.Resource }) },
{ typeof(CommonColor), (tp,p,e,v) => new BrushPropertyViewModel (tp, p, e, v, new[] {CommonBrushType.NoBrush, CommonBrushType.Solid, CommonBrushType.MaterialDesign, CommonBrushType.Resource }) },
{ typeof(CommonBrush), (tp,p,e,v) => new BrushPropertyViewModel (tp, p, e, v) },
{ typeof(CommonPoint), (tp,p,e,v) => new PointPropertyViewModel (tp, p, e, v) },
{ typeof(CommonSize), (tp,p,e,v) => new SizePropertyViewModel (tp, p, e, v) },
{ typeof(CommonRectangle), (tp,p,e,v) => new RectanglePropertyViewModel (tp, p, e, v) },
{ typeof(CommonThickness), (tp,p,e,v) => new ThicknessPropertyViewModel (tp, p, e, v) },
{ typeof(IList), (tp,p,e,v) => new CollectionPropertyViewModel (tp, p ,e, v) },
{ typeof(BindingSource), (tp,p,e,v) => new PropertyViewModel<BindingSource> (tp, p, e, v) },
{ typeof(Resource), (tp,p,e,v) => new PropertyViewModel<Resource> (tp, p, e, v) },
{ typeof(FilePath), (tp,p,e,v) => new PropertyViewModel<FilePath> (tp, p, e, v) },
{ typeof(object), (tp,p,e,v) => new ObjectPropertyViewModel (tp, p, e, v) },
{ typeof(ITypeInfo), (tp,p,e,v) => new TypePropertyViewModel (tp, p, e, v) },
{ typeof(CommonRatio), (tp, p, e, v) => new RatioViewModel (tp, p, e, v) },
};
}
}
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