src/Tizen.NUI/src/public/XamlBinding/BindableObject.cs

   1 /*
   2  * Copyright(c) 2021 Samsung Electronics Co., Ltd.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  *
  16  */
  17
  18 using System;
  19 using System.Collections.Generic;
  20 using System.ComponentModel;
  21 using System.Diagnostics;
  22 using System.Reflection;
  23 using System.Runtime.CompilerServices;
  24 using Tizen.NUI.Binding.Internals;
  25
  26 namespace Tizen.NUI.Binding
  27 {
  28     /// <summary>
  29     /// Provides a mechanism by which application developers can propagate changes that are made to data in one object to another.
  30     /// </summary>
  31     /// <since_tizen> 9 </since_tizen>
  32     public abstract class BindableObject : INotifyPropertyChanged, IDynamicResourceHandler
  33     {
  34         /// <summary>
  35         /// Implements the bound property whose interface is provided by the BindingContext property.
  36         /// </summary>
  37         [EditorBrowsable(EditorBrowsableState.Never)]
  38         public static readonly BindableProperty BindingContextProperty =
  39             BindableProperty.Create(nameof(BindingContext), typeof(object), typeof(BindableObject), default(object),
  40                                     BindingMode.OneWay, null, BindingContextPropertyChanged, null, null, BindingContextPropertyBindingChanging);
  41
  42         readonly List<BindablePropertyContext> properties = new List<BindablePropertyContext>(4);
  43
  44         bool applying;
  45         object inheritedContext;
  46
  47         /// <summary>
  48         /// Gets or sets object that contains the properties that will be targeted by the bound properties that belong to this BindableObject.
  49         /// </summary>
  50         /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
  51         [EditorBrowsable(EditorBrowsableState.Never)]
  52         public object BindingContext
  53         {
  54             get { return inheritedContext ?? GetValue(BindingContextProperty); }
  55             set { SetValue(BindingContextProperty, value); }
  56         }
  57
  58         void IDynamicResourceHandler.SetDynamicResource(BindableProperty property, string key)
  59         {
  60             SetDynamicResource(property, key, false);
  61         }
  62
  63         /// <summary>
  64         /// Raised when a property has changed.
  65         /// </summary>
  66         /// <since_tizen> 9 </since_tizen>
  67         public event PropertyChangedEventHandler PropertyChanged;
  68
  69         /// <summary>Copy properties of other ViewStyle to this.</summary>
  70         /// <param name="other">The other BindableProperty merge to this.</param>
  71         [EditorBrowsable(EditorBrowsableState.Never)]
  72         public virtual void CopyFrom(BindableObject other)
  73         {
  74             if (null == other) return;
  75
  76             Type type1 = this.GetType();
  77             BindableProperty.GetBindablePropertysOfType(type1, out var nameToBindableProperty1);
  78
  79             Type type2 = other.GetType();
  80             BindableProperty.GetBindablePropertysOfType(type2, out var nameToBindableProperty2);
  81
  82             if (null != nameToBindableProperty1)
  83             {
  84                 foreach (KeyValuePair<string, BindableProperty> keyValuePair in nameToBindableProperty1)
  85                 {
  86                     nameToBindableProperty2.TryGetValue(keyValuePair.Key, out var bindableProperty);
  87
  88                     if (null != bindableProperty)
  89                     {
  90                         object value = other.GetValue(bindableProperty);
  91
  92                         if (null != value)
  93                         {
  94                             SetValue(keyValuePair.Value, value);
  95                         }
  96                     }
  97                 }
  98             }
  99         }
 100
 101         /// <summary>
 102         /// Raised whenever the BindingContext property changes.
 103         /// </summary>
 104         /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
 105         [EditorBrowsable(EditorBrowsableState.Never)]
 106         public event EventHandler BindingContextChanged;
 107
 108         internal void ClearValue(BindableProperty property, bool fromStyle)
 109         {
 110             ClearValue(property, fromStyle: fromStyle, checkAccess: true);
 111         }
 112
 113         /// <summary>
 114         /// Clears any value set by Tizen.NUI.Xaml.BindableObject.SetValue.
 115         /// </summary>
 116         /// <param name="property">The BindableProperty to clear</param>
 117         internal void ClearValue(BindableProperty property)
 118         {
 119             ClearValue(property, fromStyle: false, checkAccess: true);
 120         }
 121
 122         /// <summary>
 123         /// Clears any value set by Tizen.NUI.Xaml.BindableObject.SetValue for the property that is identified by propertyKey.
 124         /// </summary>
 125         /// <param name="propertyKey">The BindablePropertyKey that identifies the BindableProperty to clear.</param>
 126         internal void ClearValue(BindablePropertyKey propertyKey)
 127         {
 128             if (propertyKey == null)
 129                 throw new ArgumentNullException(nameof(propertyKey));
 130
 131             ClearValue(propertyKey.BindableProperty, fromStyle: false, checkAccess: false);
 132         }
 133
 134         /// <summary>
 135         /// Return true if the target property exists and has been set.
 136         /// </summary>
 137         /// <param name="targetProperty">The target property</param>
 138         /// <returns>return true if the target property exists and has been set</returns>
 139         internal bool IsSet(BindableProperty targetProperty)
 140         {
 141             if (targetProperty == null)
 142                 throw new ArgumentNullException(nameof(targetProperty));
 143
 144             var bpcontext = GetContext(targetProperty);
 145             return bpcontext != null
 146                 && (bpcontext.Attributes & BindableContextAttributes.IsDefaultValue) == 0;
 147         }
 148
 149         /// <summary>
 150         /// Returns the value that is contained the BindableProperty.
 151         /// </summary>
 152         /// <param name="property">The BindableProperty for which to get the value.</param>
 153         /// <returns>The value that is contained the BindableProperty</returns>
 154         /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
 155         [EditorBrowsable(EditorBrowsableState.Never)]
 156         public object GetValue(BindableProperty property)
 157         {
 158             if (property == null)
 159                 throw new ArgumentNullException(nameof(property));
 160
 161             BindablePropertyContext context = property.DefaultValueCreator != null ? GetOrCreateContext(property) : GetContext(property);
 162
 163             if (context == null)
 164                 return property.DefaultValue;
 165
 166             return context.Value;
 167         }
 168
 169         /// <summary>
 170         /// Raised when a property is about to change.
 171         /// </summary>
 172         /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
 173         [EditorBrowsable(EditorBrowsableState.Never)]
 174         public event PropertyChangingEventHandler PropertyChanging;
 175
 176         /// <summary>
 177         /// Removes a previously set binding.
 178         /// </summary>
 179         /// <param name="property">The BindableProperty from which to remove bindings.</param>
 180         internal void RemoveBinding(BindableProperty property)
 181         {
 182             if (property == null)
 183                 throw new ArgumentNullException(nameof(property));
 184
 185             BindablePropertyContext context = GetContext(property);
 186             if (context == null || context.Binding == null)
 187                 return;
 188
 189             RemoveBinding(property, context);
 190         }
 191
 192         /// <summary>
 193         /// Assigns a binding to a property.
 194         /// </summary>
 195         /// <param name="targetProperty">The BindableProperty on which to set a binding.</param>
 196         /// <param name="binding">The binding to set.</param>
 197         /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
 198         [EditorBrowsable(EditorBrowsableState.Never)]
 199         public void SetBinding(BindableProperty targetProperty, BindingBase binding)
 200         {
 201             SetBinding(targetProperty, binding, false);
 202         }
 203
 204         private bool isCreateByXaml = false;
 205         /// Only used by the IL of xaml, will never changed to not hidden.
 206         [EditorBrowsable(EditorBrowsableState.Never)]
 207         public virtual bool IsCreateByXaml
 208         {
 209             get
 210             {
 211                 return isCreateByXaml;
 212             }
 213             set
 214             {
 215                 isCreateByXaml = value;
 216             }
 217         }
 218
 219         /// <summary>
 220         /// Sets the value of the specified property.
 221         /// </summary>
 222         /// <param name="property">The BindableProperty on which to assign a value.</param>
 223         /// <param name="value">The value to set.</param>
 224         /// <exception cref="ArgumentNullException"> Thrown when property is null. </exception>
 225         /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
 226         [EditorBrowsable(EditorBrowsableState.Never)]
 227         public void SetValue(BindableProperty property, object value)
 228         {
 229             if (true == isCreateByXaml)
 230             {
 231                 SetValue(property, value, false, true);
 232             }
 233             else
 234             {
 235                 if (null == property)
 236                 {
 237                     throw new ArgumentNullException(nameof(property));
 238                 }
 239                 property.PropertyChanged?.Invoke(this, null, value);
 240
 241                 OnPropertyChanged(property.PropertyName);
 242                 OnPropertyChangedWithData(property);
 243             }
 244         }
 245
 246         internal void SetValueAndForceSendChangeSignal(BindableProperty property, object value)
 247         {
 248             if (property == null)
 249                 throw new ArgumentNullException(nameof(property));
 250
 251             if (true == isCreateByXaml)
 252             {
 253                 if (property.IsReadOnly)
 254                     throw new InvalidOperationException(string.Format("The BindableProperty \"{0}\" is readonly.", property.PropertyName));
 255
 256                 SetValueCore(property, value, SetValueFlags.ClearOneWayBindings | SetValueFlags.ClearDynamicResource,
 257                     SetValuePrivateFlags.ManuallySet | SetValuePrivateFlags.CheckAccess, true);
 258             }
 259             else
 260             {
 261                 property.PropertyChanged?.Invoke(this, null, value);
 262             }
 263         }
 264
 265         /// <summary>
 266         /// Sets the value of the propertyKey.
 267         /// </summary>
 268         /// <param name="propertyKey">The BindablePropertyKey on which to assign a value.</param>
 269         /// <param name="value">The value to set.</param>
 270         /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
 271         [EditorBrowsable(EditorBrowsableState.Never)]
 272         public void SetValue(BindablePropertyKey propertyKey, object value)
 273         {
 274             if (propertyKey == null)
 275                 throw new ArgumentNullException(nameof(propertyKey));
 276
 277             SetValue(propertyKey.BindableProperty, value, false, false);
 278         }
 279
 280         /// <summary>
 281         /// Set the inherited context to a neated element.
 282         /// </summary>
 283         /// <param name="bindable">The object on which to set the inherited binding context.</param>
 284         /// <param name="value">The inherited context to set.</param>
 285         /// <exception cref="ArgumentNullException"> Thrown when bindable is null. </exception>
 286         [EditorBrowsable(EditorBrowsableState.Never)]
 287         public static void SetInheritedBindingContext(BindableObject bindable, object value)
 288         {
 289             if (null == bindable)
 290             {
 291                 throw new ArgumentNullException(nameof(bindable));
 292             }
 293
 294             BindablePropertyContext bpContext = bindable.GetContext(BindingContextProperty);
 295             if (bpContext != null && ((bpContext.Attributes & BindableContextAttributes.IsManuallySet) != 0))
 296                 return;
 297
 298             object oldContext = bindable.inheritedContext;
 299
 300             if (ReferenceEquals(oldContext, value))
 301                 return;
 302
 303             if (bpContext != null && oldContext == null)
 304                 oldContext = bpContext.Value;
 305
 306             if (bpContext != null && bpContext.Binding != null)
 307             {
 308                 bpContext.Binding.Context = value;
 309                 bindable.inheritedContext = null;
 310             }
 311             else
 312             {
 313                 bindable.inheritedContext = value;
 314             }
 315
 316             bindable.ApplyBindings(skipBindingContext: false, fromBindingContextChanged: true);
 317             bindable.OnBindingContextChanged();
 318         }
 319
 320         /// <summary>
 321         /// Apply the bindings to BindingContext.
 322         /// </summary>
 323         /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
 324         [EditorBrowsable(EditorBrowsableState.Never)]
 325         protected void ApplyBindings()
 326         {
 327             ApplyBindings(skipBindingContext: false, fromBindingContextChanged: false);
 328         }
 329
 330         /// <summary>
 331         /// Override this method to execute an action when the BindingContext changes.
 332         /// </summary>
 333         /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
 334         [EditorBrowsable(EditorBrowsableState.Never)]
 335         protected virtual void OnBindingContextChanged()
 336         {
 337             BindingContextChanged?.Invoke(this, EventArgs.Empty);
 338         }
 339
 340         /// <summary>
 341         /// Call this method from a child class to notify that a change happened on a property.
 342         /// </summary>
 343         /// <param name="propertyName">The name of the property that changed.</param>
 344         /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
 345         [EditorBrowsable(EditorBrowsableState.Never)]
 346         protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
 347             => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
 348
 349         /// <summary>
 350         /// Call this method from a child class to notify that a change is going to happen on a property.
 351         /// </summary>
 352         /// <param name="propertyName">The name of the property that is changing.</param>
 353         /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
 354         [EditorBrowsable(EditorBrowsableState.Never)]
 355         protected virtual void OnPropertyChanging([CallerMemberName] string propertyName = null)
 356             => PropertyChanging?.Invoke(this, new PropertyChangingEventArgs(propertyName));
 357
 358         /// <summary>
 359         /// Method that is called when a bound property is changed.
 360         /// </summary>
 361         [EditorBrowsable(EditorBrowsableState.Never)]
 362         protected virtual void OnPropertyChangedWithData(BindableProperty property) { }
 363
 364         /// <summary>
 365         /// Unapplies all previously set bindings.
 366         /// </summary>
 367         /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
 368         [EditorBrowsable(EditorBrowsableState.Never)]
 369         protected void UnapplyBindings()
 370         {
 371             for (int i = 0, _propertiesCount = properties.Count; i < _propertiesCount; i++)
 372             {
 373                 BindablePropertyContext context = properties[i];
 374                 if (context.Binding == null)
 375                     continue;
 376
 377                 context.Binding.Unapply();
 378             }
 379         }
 380
 381         internal bool GetIsBound(BindableProperty targetProperty)
 382         {
 383             if (targetProperty == null)
 384                 throw new ArgumentNullException(nameof(targetProperty));
 385
 386             BindablePropertyContext bpcontext = GetContext(targetProperty);
 387             return bpcontext != null && bpcontext.Binding != null;
 388         }
 389
 390         /// <summary>
 391         /// Returns the value that is contained the BindableProperty.
 392         /// </summary>
 393         /// <param name="property0">The BindableProperty instance.</param>
 394         /// <param name="property1">The BindableProperty instance.</param>
 395         /// <returns>The value that is contained the BindableProperty</returns>
 396         internal object[] GetValues(BindableProperty property0, BindableProperty property1)
 397         {
 398             var values = new object[2];
 399
 400             for (var i = 0; i < properties.Count; i++)
 401             {
 402                 BindablePropertyContext context = properties[i];
 403
 404                 if (ReferenceEquals(context.Property, property0))
 405                 {
 406                     values[0] = context.Value;
 407                     property0 = null;
 408                 }
 409                 else if (ReferenceEquals(context.Property, property1))
 410                 {
 411                     values[1] = context.Value;
 412                     property1 = null;
 413                 }
 414
 415                 if (property0 == null && property1 == null)
 416                     return values;
 417             }
 418
 419             if (!ReferenceEquals(property0, null))
 420                 values[0] = property0.DefaultValueCreator == null ? property0.DefaultValue : CreateAndAddContext(property0).Value;
 421             if (!ReferenceEquals(property1, null))
 422                 values[1] = property1.DefaultValueCreator == null ? property1.DefaultValue : CreateAndAddContext(property1).Value;
 423
 424             return values;
 425         }
 426
 427         /// <summary>
 428         /// Returns the value that is contained the BindableProperty.
 429         /// </summary>
 430         /// <param name="property0">The BindableProperty instance.</param>
 431         /// <param name="property1">The BindableProperty instance.</param>
 432         /// <param name="property2">The BindableProperty instance.</param>
 433         /// <returns>The value that is contained the BindableProperty</returns>
 434         internal object[] GetValues(BindableProperty property0, BindableProperty property1, BindableProperty property2)
 435         {
 436             var values = new object[3];
 437
 438             for (var i = 0; i < properties.Count; i++)
 439             {
 440                 BindablePropertyContext context = properties[i];
 441
 442                 if (ReferenceEquals(context.Property, property0))
 443                 {
 444                     values[0] = context.Value;
 445                     property0 = null;
 446                 }
 447                 else if (ReferenceEquals(context.Property, property1))
 448                 {
 449                     values[1] = context.Value;
 450                     property1 = null;
 451                 }
 452                 else if (ReferenceEquals(context.Property, property2))
 453                 {
 454                     values[2] = context.Value;
 455                     property2 = null;
 456                 }
 457
 458                 if (property0 == null && property1 == null && property2 == null)
 459                     return values;
 460             }
 461
 462             if (!ReferenceEquals(property0, null))
 463                 values[0] = property0.DefaultValueCreator == null ? property0.DefaultValue : CreateAndAddContext(property0).Value;
 464             if (!ReferenceEquals(property1, null))
 465                 values[1] = property1.DefaultValueCreator == null ? property1.DefaultValue : CreateAndAddContext(property1).Value;
 466             if (!ReferenceEquals(property2, null))
 467                 values[2] = property2.DefaultValueCreator == null ? property2.DefaultValue : CreateAndAddContext(property2).Value;
 468
 469             return values;
 470         }
 471
 472         /// <summary>
 473         /// Returns the value that is contained the BindableProperty.
 474         /// </summary>
 475         /// <param name="properties">The array of the BindableProperty instances</param>
 476         /// <returns>The values that is contained the BindableProperty instances.</returns>
 477         internal object[] GetValues(params BindableProperty[] properties)
 478         {
 479             var values = new object[properties.Length];
 480             for (var i = 0; i < this.properties.Count; i++)
 481             {
 482                 var context = this.properties[i];
 483                 var index = properties.IndexOf(context.Property);
 484                 if (index < 0)
 485                     continue;
 486                 values[index] = context.Value;
 487             }
 488             for (var i = 0; i < values.Length; i++)
 489             {
 490                 if (!ReferenceEquals(values[i], null))
 491                     continue;
 492                 values[i] = properties[i].DefaultValueCreator == null ? properties[i].DefaultValue : CreateAndAddContext(properties[i]).Value;
 493             }
 494             return values;
 495         }
 496
 497         internal virtual void OnRemoveDynamicResource(BindableProperty property)
 498         {
 499         }
 500
 501         internal virtual void OnSetDynamicResource(BindableProperty property, string key)
 502         {
 503         }
 504
 505         internal void RemoveDynamicResource(BindableProperty property)
 506         {
 507             if (property == null)
 508                 throw new ArgumentNullException(nameof(property));
 509
 510             OnRemoveDynamicResource(property);
 511             BindablePropertyContext context = GetOrCreateContext(property);
 512             context.Attributes &= ~BindableContextAttributes.IsDynamicResource;
 513         }
 514
 515         internal void SetBinding(BindableProperty targetProperty, BindingBase binding, bool fromStyle)
 516         {
 517             if (targetProperty == null)
 518                 throw new ArgumentNullException(nameof(targetProperty));
 519             if (binding == null)
 520                 throw new ArgumentNullException(nameof(binding));
 521
 522             if (fromStyle && !CanBeSetFromStyle(targetProperty))
 523                 return;
 524
 525             var context = GetOrCreateContext(targetProperty);
 526             if (fromStyle)
 527                 context.Attributes |= BindableContextAttributes.IsSetFromStyle;
 528             else
 529                 context.Attributes &= ~BindableContextAttributes.IsSetFromStyle;
 530
 531             if (context.Binding != null)
 532                 context.Binding.Unapply();
 533
 534             BindingBase oldBinding = context.Binding;
 535             context.Binding = binding;
 536
 537             targetProperty.BindingChanging?.Invoke(this, oldBinding, binding);
 538
 539             binding.Apply(BindingContext, this, targetProperty);
 540         }
 541
 542         bool CanBeSetFromStyle(BindableProperty property)
 543         {
 544             var context = GetContext(property);
 545             if (context == null)
 546                 return true;
 547             if ((context.Attributes & BindableContextAttributes.IsSetFromStyle) == BindableContextAttributes.IsSetFromStyle)
 548                 return true;
 549             if ((context.Attributes & BindableContextAttributes.IsDefaultValue) == BindableContextAttributes.IsDefaultValue)
 550                 return true;
 551             if ((context.Attributes & BindableContextAttributes.IsDefaultValueCreated) == BindableContextAttributes.IsDefaultValueCreated)
 552                 return true;
 553             return false;
 554         }
 555
 556         internal void SetDynamicResource(BindableProperty property, string key)
 557         {
 558             SetDynamicResource(property, key, false);
 559         }
 560
 561         internal void SetDynamicResource(BindableProperty property, string key, bool fromStyle)
 562         {
 563             if (property == null)
 564                 throw new ArgumentNullException(nameof(property));
 565             if (string.IsNullOrEmpty(key))
 566                 throw new ArgumentNullException(nameof(key));
 567             if (fromStyle && !CanBeSetFromStyle(property))
 568                 return;
 569
 570             var context = GetOrCreateContext(property);
 571
 572             context.Attributes |= BindableContextAttributes.IsDynamicResource;
 573             if (fromStyle)
 574                 context.Attributes |= BindableContextAttributes.IsSetFromStyle;
 575             else
 576                 context.Attributes &= ~BindableContextAttributes.IsSetFromStyle;
 577
 578             OnSetDynamicResource(property, key);
 579         }
 580
 581         internal void SetValue(BindableProperty property, object value, bool fromStyle)
 582         {
 583             SetValue(property, value, fromStyle, true);
 584         }
 585
 586         internal void SetValueCore(BindablePropertyKey propertyKey, object value, SetValueFlags attributes = SetValueFlags.None)
 587         {
 588             SetValueCore(propertyKey.BindableProperty, value, attributes, SetValuePrivateFlags.None, false);
 589         }
 590
 591         /// <summary>
 592         /// For internal use.
 593         /// </summary>
 594         /// <param name="property">The BindableProperty on which to assign a value.</param>
 595         /// <param name="value">The value to set</param>
 596         /// <param name="attributes">The set value flag</param>
 597         [EditorBrowsable(EditorBrowsableState.Never)]
 598         internal void SetValueCore(BindableProperty property, object value, SetValueFlags attributes = SetValueFlags.None)
 599         {
 600             SetValueCore(property, value, attributes, SetValuePrivateFlags.Default, false);
 601         }
 602
 603         internal void SetValueCore(BindableProperty property, object value, SetValueFlags attributes, SetValuePrivateFlags privateAttributes, bool forceSendChangeSignal)
 604         {
 605             bool checkAccess = (privateAttributes & SetValuePrivateFlags.CheckAccess) != 0;
 606             bool manuallySet = (privateAttributes & SetValuePrivateFlags.ManuallySet) != 0;
 607             bool silent = (privateAttributes & SetValuePrivateFlags.Silent) != 0;
 608             bool fromStyle = (privateAttributes & SetValuePrivateFlags.FromStyle) != 0;
 609             bool converted = (privateAttributes & SetValuePrivateFlags.Converted) != 0;
 610
 611             if (property == null)
 612                 throw new ArgumentNullException(nameof(property));
 613             if (checkAccess && property.IsReadOnly)
 614             {
 615                 Debug.WriteLine("Can not set the BindableProperty \"{0}\" because it is readonly.", property.PropertyName);
 616                 return;
 617             }
 618
 619             if (!converted && !property.TryConvert(ref value))
 620             {
 621                 Console.WriteLine($"SetValue : Can not convert {value} to type {property.ReturnType}");
 622                 return;
 623             }
 624
 625             if (property.ValidateValue != null && !property.ValidateValue(this, value))
 626                 throw new ArgumentException("Value was an invalid value for " + property.PropertyName, nameof(value));
 627
 628             if (property.CoerceValue != null)
 629                 value = property.CoerceValue(this, value);
 630
 631             BindablePropertyContext context = GetOrCreateContext(property);
 632             if (manuallySet)
 633             {
 634                 context.Attributes |= BindableContextAttributes.IsManuallySet;
 635                 context.Attributes &= ~BindableContextAttributes.IsSetFromStyle;
 636             }
 637             else
 638                 context.Attributes &= ~BindableContextAttributes.IsManuallySet;
 639
 640             if (fromStyle)
 641                 context.Attributes |= BindableContextAttributes.IsSetFromStyle;
 642             // else omitted on purpose
 643
 644             bool currentlyApplying = applying;
 645
 646             if ((context.Attributes & BindableContextAttributes.IsBeingSet) != 0)
 647             {
 648                 Queue<SetValueArgs> delayQueue = context.DelayedSetters;
 649                 if (delayQueue == null)
 650                     context.DelayedSetters = delayQueue = new Queue<SetValueArgs>();
 651
 652                 delayQueue.Enqueue(new SetValueArgs(property, context, value, currentlyApplying, attributes));
 653             }
 654             else
 655             {
 656                 context.Attributes |= BindableContextAttributes.IsBeingSet;
 657                 SetValueActual(property, context, value, currentlyApplying, forceSendChangeSignal, attributes, silent);
 658
 659                 Queue<SetValueArgs> delayQueue = context.DelayedSetters;
 660                 if (delayQueue != null)
 661                 {
 662                     while (delayQueue.Count > 0)
 663                     {
 664                         SetValueArgs s = delayQueue.Dequeue();
 665                         SetValueActual(s.Property, s.Context, s.Value, s.CurrentlyApplying, forceSendChangeSignal, s.Attributes);
 666                     }
 667
 668                     context.DelayedSetters = null;
 669                 }
 670
 671                 context.Attributes &= ~BindableContextAttributes.IsBeingSet;
 672             }
 673         }
 674
 675         internal void ApplyBindings(bool skipBindingContext, bool fromBindingContextChanged)
 676         {
 677             var prop = properties.ToArray();
 678             for (int i = 0, propLength = prop.Length; i < propLength; i++)
 679             {
 680                 BindablePropertyContext context = prop[i];
 681                 BindingBase binding = context.Binding;
 682                 if (binding == null)
 683                     continue;
 684
 685                 if (skipBindingContext && ReferenceEquals(context.Property, BindingContextProperty))
 686                     continue;
 687
 688                 binding.Unapply(fromBindingContextChanged: fromBindingContextChanged);
 689                 binding.Apply(BindingContext, this, context.Property, fromBindingContextChanged: fromBindingContextChanged);
 690             }
 691         }
 692
 693         static void BindingContextPropertyBindingChanging(BindableObject bindable, BindingBase oldBindingBase, BindingBase newBindingBase)
 694         {
 695             object context = bindable.inheritedContext;
 696             var oldBinding = oldBindingBase as Binding;
 697             var newBinding = newBindingBase as Binding;
 698
 699             if (context == null && oldBinding != null)
 700                 context = oldBinding.Context;
 701             if (context != null && newBinding != null)
 702                 newBinding.Context = context;
 703         }
 704
 705         static void BindingContextPropertyChanged(BindableObject bindable, object oldvalue, object newvalue)
 706         {
 707             bindable.inheritedContext = null;
 708             bindable.ApplyBindings(skipBindingContext: true, fromBindingContextChanged: true);
 709             bindable.OnBindingContextChanged();
 710         }
 711
 712         void ClearValue(BindableProperty property, bool fromStyle, bool checkAccess)
 713         {
 714             if (property == null)
 715                 throw new ArgumentNullException(nameof(property));
 716
 717             if (checkAccess && property.IsReadOnly)
 718                 throw new InvalidOperationException(string.Format("The BindableProperty \"{0}\" is readonly.", property.PropertyName));
 719
 720             BindablePropertyContext bpcontext = GetContext(property);
 721             if (bpcontext == null)
 722                 return;
 723
 724             if (fromStyle && !CanBeSetFromStyle(property))
 725                 return;
 726
 727             object original = bpcontext.Value;
 728
 729             object newValue = property.GetDefaultValue(this);
 730
 731             bool same = Equals(original, newValue);
 732             if (!same)
 733             {
 734                 property.PropertyChanging?.Invoke(this, original, newValue);
 735
 736                 OnPropertyChanging(property.PropertyName);
 737             }
 738
 739             bpcontext.Attributes &= ~BindableContextAttributes.IsManuallySet;
 740             bpcontext.Value = newValue;
 741             if (property.DefaultValueCreator == null)
 742                 bpcontext.Attributes |= BindableContextAttributes.IsDefaultValue;
 743             else
 744                 bpcontext.Attributes |= BindableContextAttributes.IsDefaultValueCreated;
 745
 746             if (!same)
 747             {
 748                 OnPropertyChanged(property.PropertyName);
 749                 OnPropertyChangedWithData(property);
 750                 property.PropertyChanged?.Invoke(this, original, newValue);
 751             }
 752         }
 753
 754         [MethodImpl(MethodImplOptions.AggressiveInlining)]
 755         BindablePropertyContext CreateAndAddContext(BindableProperty property)
 756         {
 757             var context = new BindablePropertyContext { Property = property, Value = property.DefaultValueCreator != null ? property.DefaultValueCreator(this) : property.DefaultValue };
 758
 759             if (property.DefaultValueCreator == null)
 760                 context.Attributes = BindableContextAttributes.IsDefaultValue;
 761             else
 762                 context.Attributes = BindableContextAttributes.IsDefaultValueCreated;
 763
 764             properties.Add(context);
 765             return context;
 766         }
 767
 768         [MethodImpl(MethodImplOptions.AggressiveInlining)]
 769         BindablePropertyContext GetContext(BindableProperty property)
 770         {
 771             List<BindablePropertyContext> propertyList = properties;
 772
 773             for (var i = 0; i < propertyList.Count; i++)
 774             {
 775                 BindablePropertyContext context = propertyList[i];
 776                 if (ReferenceEquals(context.Property, property))
 777                     return context;
 778             }
 779
 780             return null;
 781         }
 782
 783         [MethodImpl(MethodImplOptions.AggressiveInlining)]
 784         BindablePropertyContext GetOrCreateContext(BindableProperty property)
 785         {
 786             BindablePropertyContext context = GetContext(property);
 787             if (context == null)
 788             {
 789                 context = CreateAndAddContext(property);
 790             }
 791             else if (property.DefaultValueCreator != null)
 792             {
 793                 context.Value = property.DefaultValueCreator(this); //Update Value from dali
 794             }//added by xb.teng
 795
 796             return context;
 797         }
 798
 799         void RemoveBinding(BindableProperty property, BindablePropertyContext context)
 800         {
 801             context.Binding.Unapply();
 802
 803             property.BindingChanging?.Invoke(this, context.Binding, null);
 804
 805             context.Binding = null;
 806         }
 807
 808         void SetValue(BindableProperty property, object value, bool fromStyle, bool checkAccess)
 809         {
 810             if (property == null)
 811                 throw new ArgumentNullException(nameof(property));
 812
 813             if (checkAccess && property.IsReadOnly)
 814                 throw new InvalidOperationException(string.Format("The BindableProperty \"{0}\" is readonly.", property.PropertyName));
 815
 816             if (fromStyle && !CanBeSetFromStyle(property))
 817                 return;
 818
 819             SetValueCore(property, value, SetValueFlags.ClearOneWayBindings | SetValueFlags.ClearDynamicResource,
 820                 (fromStyle ? SetValuePrivateFlags.FromStyle : SetValuePrivateFlags.ManuallySet) | (checkAccess ? SetValuePrivateFlags.CheckAccess : 0),
 821                 false);
 822         }
 823
 824         void SetValueActual(BindableProperty property, BindablePropertyContext context, object value, bool currentlyApplying, bool forceSendChangeSignal, SetValueFlags attributes, bool silent = false)
 825         {
 826             object original = context.Value;
 827             bool raiseOnEqual = (attributes & SetValueFlags.RaiseOnEqual) != 0;
 828             bool clearDynamicResources = (attributes & SetValueFlags.ClearDynamicResource) != 0;
 829             bool clearOneWayBindings = (attributes & SetValueFlags.ClearOneWayBindings) != 0;
 830             bool clearTwoWayBindings = (attributes & SetValueFlags.ClearTwoWayBindings) != 0;
 831
 832             bool same = ReferenceEquals(context.Property, BindingContextProperty) ? ReferenceEquals(value, original) : Equals(value, original);
 833             if (!silent && (!same || raiseOnEqual))
 834             {
 835                 property.PropertyChanging?.Invoke(this, original, value);
 836
 837                 OnPropertyChanging(property.PropertyName);
 838             }
 839
 840             if (!same || raiseOnEqual)
 841             {
 842                 context.Value = value;
 843             }
 844
 845             context.Attributes &= ~BindableContextAttributes.IsDefaultValue;
 846             context.Attributes &= ~BindableContextAttributes.IsDefaultValueCreated;
 847
 848             if ((context.Attributes & BindableContextAttributes.IsDynamicResource) != 0 && clearDynamicResources)
 849                 RemoveDynamicResource(property);
 850
 851             BindingBase binding = context.Binding;
 852             if (binding != null)
 853             {
 854                 if (clearOneWayBindings && binding.GetRealizedMode(property) == BindingMode.OneWay || clearTwoWayBindings && binding.GetRealizedMode(property) == BindingMode.TwoWay)
 855                 {
 856                     RemoveBinding(property, context);
 857                     binding = null;
 858                 }
 859             }
 860
 861             if (!silent)
 862             {
 863                 if ((!same || raiseOnEqual))
 864                 {
 865                     property.PropertyChanged?.Invoke(this, original, value);
 866
 867                     if (binding != null && !currentlyApplying)
 868                     {
 869                         applying = true;
 870                         binding.Apply(true);
 871                         applying = false;
 872                     }
 873
 874                     OnPropertyChanged(property.PropertyName);
 875                 }
 876                 else if (true == same && true == forceSendChangeSignal)
 877                 {
 878                     if (binding != null && !currentlyApplying)
 879                     {
 880                         applying = true;
 881                         binding.Apply(true);
 882                         applying = false;
 883                     }
 884
 885                     OnPropertyChanged(property.PropertyName);
 886                 }
 887
 888                 OnPropertyChangedWithData(property);
 889             }
 890         }
 891
 892         [Flags]
 893         enum BindableContextAttributes
 894         {
 895             IsManuallySet = 1 << 0,
 896             IsBeingSet = 1 << 1,
 897             IsDynamicResource = 1 << 2,
 898             IsSetFromStyle = 1 << 3,
 899             IsDefaultValue = 1 << 4,
 900             IsDefaultValueCreated = 1 << 5,
 901         }
 902
 903         class BindablePropertyContext
 904         {
 905             public BindableContextAttributes Attributes;
 906             public BindingBase Binding;
 907             public Queue<SetValueArgs> DelayedSetters;
 908             public BindableProperty Property;
 909             public object Value;
 910         }
 911
 912         [Flags]
 913         internal enum SetValuePrivateFlags
 914         {
 915             None = 0,
 916             CheckAccess = 1 << 0,
 917             Silent = 1 << 1,
 918             ManuallySet = 1 << 2,
 919             FromStyle = 1 << 3,
 920             Converted = 1 << 4,
 921             Default = CheckAccess
 922         }
 923
 924         class SetValueArgs
 925         {
 926             public readonly SetValueFlags Attributes;
 927             public readonly BindablePropertyContext Context;
 928             public readonly bool CurrentlyApplying;
 929             public readonly BindableProperty Property;
 930             public readonly object Value;
 931
 932             public SetValueArgs(BindableProperty property, BindablePropertyContext context, object value, bool currentlyApplying, SetValueFlags attributes)
 933             {
 934                 Property = property;
 935                 Context = context;
 936                 Value = value;
 937                 CurrentlyApplying = currentlyApplying;
 938                 Attributes = attributes;
 939             }
 940         }
 941     }
 942 }
 943
 944 namespace Tizen.NUI.Binding.Internals
 945 {
 946     /// <summary>
 947     /// SetValueFlags. For internal use.
 948     /// </summary>
 949     [Flags]
 950     [EditorBrowsable(EditorBrowsableState.Never)]
 951     public enum SetValueFlags
 952     {
 953         /// <summary>
 954         /// None.
 955         /// </summary>
 956         /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
 957         [EditorBrowsable(EditorBrowsableState.Never)]
 958         None = 0,
 959
 960         /// <summary>
 961         /// Clear OneWay bindings.
 962         /// </summary>
 963         /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
 964         [EditorBrowsable(EditorBrowsableState.Never)]
 965         ClearOneWayBindings = 1 << 0,
 966
 967         /// <summary>
 968         /// Clear TwoWay bindings.
 969         /// </summary>
 970         /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
 971         [EditorBrowsable(EditorBrowsableState.Never)]
 972         ClearTwoWayBindings = 1 << 1,
 973
 974         /// <summary>
 975         /// Clear dynamic resource.
 976         /// </summary>
 977         /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
 978         [EditorBrowsable(EditorBrowsableState.Never)]
 979         ClearDynamicResource = 1 << 2,
 980
 981         /// <summary>
 982         /// Raise or equal.
 983         /// </summary>
 984         /// This will be public opened in tizen_5.0 after ACR done. Before ACR, need to be hidden as inhouse API.
 985         [EditorBrowsable(EditorBrowsableState.Never)]
 986         RaiseOnEqual = 1 << 3
 987     }
 988 }