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//
// ItemTemplate.cs
//
// Author:
// Jean-Philippe Bruyère <jp.bruyere@hotmail.com>
//
// Copyright (c) 2013-2017 Jean-Philippe Bruyère
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using System.IO;
using System.Reflection;
using System.Reflection.Emit;
using System.Threading;
using System.Xml.Serialization;
using System.Xml;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
namespace Crow
{
/// <summary> Test func on data, return yes if there's children </summary>
public delegate bool BooleanTestOnInstance(object instance);
/// <summary>
/// Derived from Instantiator with sub data fetching facilities for hierarchical data access.
/// </summary>
public class ItemTemplate : Instantiator {
public EventHandler Expand;
public BooleanTestOnInstance HasSubItems;
string strDataType;
string fetchMethodName;
#region CTOR
public ItemTemplate(string path, string _dataType = null, string _fetchDataMethod = null)
: base(path) {
strDataType = _dataType;
fetchMethodName = _fetchDataMethod;
}
public ItemTemplate (Stream ImlFragment, string _dataType, string _fetchDataMethod)
:base(ImlFragment)
{
strDataType = _dataType;
fetchMethodName = _fetchDataMethod;
}
#endregion
public void CreateExpandDelegate (TemplatedGroup host){
Type dataType = CompilerServices.tryGetType(strDataType);
if (dataType == null) {
Debug.WriteLine ("ItemTemplate error: DataType not found: {0}.", strDataType);
return;
}
Type tmpGrpType = typeof(TemplatedGroup);
Type evtType = typeof(EventHandler);
PropertyInfo piData = tmpGrpType.GetProperty ("Data");
MethodInfo evtInvoke = evtType.GetMethod ("Invoke");
ParameterInfo [] evtParams = evtInvoke.GetParameters ();
Type handlerArgsType = evtParams [1].ParameterType;
Type [] args = { CompilerServices.TObject, CompilerServices.TObject, handlerArgsType };
#region Expand dyn meth
//DM is bound to templatedGroup root (arg0)
//arg1 is the sender of the expand event
DynamicMethod dm = new DynamicMethod ("dyn_expand_" + fetchMethodName,
typeof (void), args, true);
System.Reflection.Emit.Label gotoEnd;
System.Reflection.Emit.Label ifDataIsNull;
ILGenerator il = dm.GetILGenerator (256);
il.DeclareLocal(typeof(GraphicObject));
gotoEnd = il.DefineLabel ();
ifDataIsNull = il.DefineLabel ();
il.Emit (OpCodes.Ldarg_1);//load sender of expand event
il.Emit(OpCodes.Ldstr, "List");
il.Emit (OpCodes.Callvirt, CompilerServices.miFindByName);
il.Emit (OpCodes.Stloc_0);
//check that 'Data' of list is not already set
il.Emit (OpCodes.Ldloc_0);
il.Emit (OpCodes.Callvirt, piData.GetGetMethod ());
il.Emit (OpCodes.Brfalse, ifDataIsNull);
il.Emit (OpCodes.Br, gotoEnd);
il.MarkLabel(ifDataIsNull);
//copy the ref of ItemTemplates list TODO: maybe find another way to share it among the nodes?
FieldInfo fiTemplates = tmpGrpType.GetField("ItemTemplates");
il.Emit (OpCodes.Ldloc_0);
il.Emit (OpCodes.Ldarg_0);
il.Emit (OpCodes.Ldfld, fiTemplates);
il.Emit (OpCodes.Stfld, fiTemplates);
//call 'fetchMethodName' from the dataSource to build the sub nodes list
il.Emit (OpCodes.Ldloc_0);//push 'List' (of sub nodes) into the stack
il.Emit (OpCodes.Ldarg_1);//get the dataSource of the sender
il.Emit (OpCodes.Callvirt, CompilerServices.miGetDataSource);
if (fetchMethodName != "self")//special keyword self allows the use of recurent list<<<
emitGetSubData(il, dataType);
//set 'return' from the fetch method as 'data' of the list
il.Emit (OpCodes.Callvirt, piData.GetSetMethod ());
il.MarkLabel(gotoEnd);
il.Emit (OpCodes.Ret);
Expand = (EventHandler)dm.CreateDelegate (evtType, host);
#endregion
#region Items counting dyn method
//dm is unbound, arg0 is instance of Item container to expand
dm = new DynamicMethod ("dyn_count_" + fetchMethodName,
typeof (bool), new Type[] {CompilerServices.TObject}, true);
il = dm.GetILGenerator (256);
//get the dataSource of the arg0
il.Emit (OpCodes.Ldarg_0);
il.Emit (OpCodes.Callvirt, CompilerServices.miGetDataSource);
if (fetchMethodName != "self")
emitGetSubData(il, dataType);
il.Emit (OpCodes.Callvirt, CompilerServices.miGetColCount);
il.Emit (OpCodes.Ldc_I4_0);
il.Emit (OpCodes.Cgt);
il.Emit (OpCodes.Ret);
HasSubItems = (BooleanTestOnInstance)dm.CreateDelegate (typeof(BooleanTestOnInstance));
#endregion
}
void emitGetSubData(ILGenerator il, Type dataType){
MethodInfo miGetDatas = dataType.GetMethod (fetchMethodName, new Type[] {});
if (miGetDatas == null)
miGetDatas = CompilerServices.SearchExtMethod (dataType, fetchMethodName);
if (miGetDatas == null) {//in last resort, search among properties
PropertyInfo piDatas = dataType.GetProperty (fetchMethodName);
if (piDatas == null) {
FieldInfo fiDatas = dataType.GetField (fetchMethodName);
if (fiDatas == null)//and among fields
throw new Exception ("Fetch data member not found in ItemTemplate: " + fetchMethodName);
il.Emit (OpCodes.Ldfld, fiDatas);
return;
}
miGetDatas = piDatas.GetGetMethod ();
if (miGetDatas == null)
throw new Exception ("Read only property for fetching data in ItemTemplate: " + fetchMethodName);
}
il.Emit (OpCodes.Callvirt, miGetDatas);
}
}
}
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