Xamlc compiled trigger (#629)

* [XamlC] compiled Trigger

* remove file header

* name bool parameters

3 files changed, 42 insertions, 2 deletions

diff --git a/Xamarin.Forms.Build.Tasks/CompiledValueProviders/SetterValueProvider.cs b/Xamarin.Forms.Build.Tasks/CompiledValueProviders/SetterValueProvider.cs
index 163bd9e7..482ee7c6 100644
--- a/Xamarin.Forms.Build.Tasks/CompiledValueProviders/SetterValueProvider.cs
+++ b/Xamarin.Forms.Build.Tasks/CompiledValueProviders/SetterValueProvider.cs
@@ -1,5 +1,4 @@
-using System;
-using System.Collections.Generic;
+using System.Collections.Generic;
 
 using Mono.Cecil;
 using Mono.Cecil.Cil;
diff --git a/Xamarin.Forms.Build.Tasks/CompiledValueProviders/TriggerValueProvider.cs b/Xamarin.Forms.Build.Tasks/CompiledValueProviders/TriggerValueProvider.cs
new file mode 100644
index 00000000..c2875c7c
--- /dev/null
+++ b/Xamarin.Forms.Build.Tasks/CompiledValueProviders/TriggerValueProvider.cs
@@ -0,0 +1,40 @@
+using System.Collections.Generic;
+
+using Mono.Cecil;
+using Mono.Cecil.Cil;
+
+using Xamarin.Forms.Xaml;
+using Xamarin.Forms.Build.Tasks;
+
+namespace Xamarin.Forms.Core.XamlC
+{
+	
+	class TriggerValueProvider : ICompiledValueProvider
+	{
+		public IEnumerable<Instruction> ProvideValue(VariableDefinitionReference vardefref, ModuleDefinition module, BaseNode node, ILContext context)
+		{
+			var valueNode = ((IElementNode)node).Properties[new XmlName("", "Value")];
+
+			//if it's an elementNode, there's probably no need to convert it
+			if (valueNode is IElementNode)
+				yield break;
+
+			var value = ((string)((ValueNode)valueNode).Value);
+			var bpNode = ((ValueNode)((IElementNode)node).Properties[new XmlName("", "Property")]);
+			var bpRef = (new BindablePropertyConverter()).GetBindablePropertyFieldReference((string)bpNode.Value, module, bpNode);
+
+			TypeReference _;
+			var setValueRef = module.Import(module.Import(typeof(Trigger)).GetProperty(p => p.Name == "Value", out _).SetMethod);
+
+			//push the setter
+			yield return Instruction.Create(OpCodes.Ldloc, vardefref.VariableDefinition);
+
+			//push the value
+			foreach (var instruction in ((ValueNode)valueNode).PushConvertedValue(context, bpRef, valueNode.PushServiceProvider(context, bpRef: bpRef), boxValueTypes: true, unboxValueTypes: false))
+				yield return instruction;
+
+			//set the value
+			yield return Instruction.Create(OpCodes.Callvirt, setValueRef);
+		}
+	}
+}
\ No newline at end of file
diff --git a/Xamarin.Forms.Build.Tasks/Xamarin.Forms.Build.Tasks.csproj b/Xamarin.Forms.Build.Tasks/Xamarin.Forms.Build.Tasks.csproj
index 51dd60be..ac7d6f13 100644
--- a/Xamarin.Forms.Build.Tasks/Xamarin.Forms.Build.Tasks.csproj
+++ b/Xamarin.Forms.Build.Tasks/Xamarin.Forms.Build.Tasks.csproj
@@ -107,6 +107,7 @@
     <Compile Include="CompiledConverters\TypeTypeConverter.cs" />
     <Compile Include="CompiledValueProviders\SetterValueProvider.cs" />
     <Compile Include="CompiledValueProviders\ICompiledValueProvider.cs" />
+    <Compile Include="CompiledValueProviders\TriggerValueProvider.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <Target Name="AfterBuild">