src/Tizen.NUI/src/internal/XamlBinding/Interactivity/MultiCondition.cs

   1 using System.Collections.Generic;
   2
   3 namespace Tizen.NUI.Binding
   4 {
   5     internal sealed class MultiCondition : Condition
   6     {
   7         readonly BindableProperty _aggregatedStateProperty;
   8
   9         public MultiCondition()
  10         {
  11             _aggregatedStateProperty = BindableProperty.CreateAttached("AggregatedState", typeof(bool), typeof(MultiCondition), false, propertyChanged: OnAggregatedStatePropertyChanged);
  12             Conditions = new TriggerBase.SealedList<Condition>();
  13         }
  14
  15         public IList<Condition> Conditions { get; }
  16
  17         internal override bool GetState(BindableObject bindable)
  18         {
  19             return (bool)bindable.GetValue(_aggregatedStateProperty);
  20         }
  21
  22         internal override void OnSealed()
  23         {
  24             ((TriggerBase.SealedList<Condition>)Conditions).IsReadOnly = true;
  25             foreach (Condition condition in Conditions)
  26                 condition.ConditionChanged = OnConditionChanged;
  27         }
  28
  29         internal override void SetUp(BindableObject bindable)
  30         {
  31             foreach (Condition condition in Conditions)
  32                 condition.SetUp(bindable);
  33         }
  34
  35         internal override void TearDown(BindableObject bindable)
  36         {
  37             foreach (Condition condition in Conditions)
  38                 condition.TearDown(bindable);
  39         }
  40
  41         void OnAggregatedStatePropertyChanged(BindableObject bindable, object oldValue, object newValue)
  42         {
  43             if ((bool)oldValue == (bool)newValue)
  44                 return;
  45
  46             ConditionChanged?.Invoke(bindable, (bool)oldValue, (bool)newValue);
  47         }
  48
  49         void OnConditionChanged(BindableObject bindable, bool oldValue, bool newValue)
  50         {
  51             var oldState = (bool)bindable.GetValue(_aggregatedStateProperty);
  52             var newState = true;
  53             foreach (Condition condition in Conditions)
  54             {
  55                 if (!condition.GetState(bindable))
  56                 {
  57                     newState = false;
  58                     break;
  59                 }
  60             }
  61             if (newState != oldState)
  62                 bindable.SetValue(_aggregatedStateProperty, newState);
  63         }
  64     }
  65 }