void readPropertyBinding(Context ctx, string sourceMember, string expression)
{
NodeAddress sourceNA = ctx.CurrentNodeAddress;
BindingDefinition bindingDef = splitBindingExp (sourceNA, sourceMember, expression);
#if DEBUG_BINDING
Debug.WriteLine("Property Binding: " + bindingDef.ToString());
#endif
if (bindingDef.IsDataSourceBinding)//bind on data source
emitDataSourceBindings (ctx, bindingDef);
else
ctx.StorePropertyBinding (bindingDef);
}
/// <summary>
/// Parses IML and build a dynamic method that will be used to instanciate one or multiple occurence of the IML file or fragment
/// </summary>
void parseIML(XmlTextReader reader)
{
Context ctx = new Context (findRootType (reader));
ctx.nodesStack.Push (new Node (ctx.RootType));
emitLoader (reader, ctx);
ctx.nodesStack.Pop ();
foreach (int idx in templateCachedDelegateIndices)
ctx.emitCachedDelegateHandlerAddition(idx, CompilerServices.eiLogicalParentChanged);
ctx.ResolveNamedTargets ();
emitBindingDelegates (ctx);
ctx.il.Emit (OpCodes.Ldloc_0);//load root obj to return
ctx.il.Emit(OpCodes.Ret);
reader.Read ();//close tag
RootType = ctx.RootType;
loader = (InstanciatorInvoker)ctx.dm.CreateDelegate (typeof (InstanciatorInvoker), this);
}
/// <summary>
/// Parse child node an generate corresponding msil
/// </summary>
void readChildren(XmlTextReader reader, Context ctx, int startingIdx = 0)
{
bool endTagReached = false;
int nodeIdx = startingIdx;
while (reader.Read ()) {
switch (reader.NodeType) {
case XmlNodeType.EndElement:
endTagReached = true;
break;
case XmlNodeType.Element:
//skip Templates
if (reader.Name == "Template" ||
reader.Name == "ItemTemplate") {
reader.Skip ();
continue;
}
//push 2x current instance on stack for parenting and reseting loc0 to parent
//loc_0 will be used for child
ctx.il.Emit (OpCodes.Ldloc_0);
ctx.il.Emit (OpCodes.Ldloc_0);
Type t = Type.GetType ("Crow." + reader.Name);
if (t == null) {
Assembly a = Assembly.GetEntryAssembly ();
foreach (Type expT in a.GetExportedTypes ()) {
if (expT.Name == reader.Name)
t = expT;
}
}
if (t == null)
throw new Exception (reader.Name + " type not found");
ctx.il.Emit (OpCodes.Newobj, t.GetConstructors () [0]);//TODO:search parameterless ctor
ctx.il.Emit (OpCodes.Stloc_0);//child is now loc_0
CompilerServices.emitSetCurInterface (ctx.il);
ctx.nodesStack.Push (new Node (t, nodeIdx));
emitLoader (reader, ctx);
ctx.nodesStack.Pop ();
ctx.il.Emit (OpCodes.Ldloc_0);//load child on stack for parenting
ctx.il.Emit (OpCodes.Callvirt, ctx.nodesStack.Peek().GetAddMethod(nodeIdx));
ctx.il.Emit (OpCodes.Stloc_0); //reset local to current go
nodeIdx++;
break;
}
if (endTagReached)
break;
}
}
void emitTemplateBindings(Context ctx, Dictionary<string, List<MemberAddress>> bindings)
{
//value changed dyn method
DynamicMethod dm = new DynamicMethod ("dyn_tmpValueChanged",
typeof (void), CompilerServices.argsValueChange, true);
ILGenerator il = dm.GetILGenerator (256);
//create parentchanged dyn meth in parallel to have only one loop over bindings
DynamicMethod dmPC = new DynamicMethod ("dyn_InitAndLogicalParentChanged",
typeof (void),
CompilerServices.argsBoundDSChange, true);
ILGenerator ilPC = dmPC.GetILGenerator (256);
il.Emit (OpCodes.Nop);
ilPC.Emit (OpCodes.Nop);
System.Reflection.Emit.Label endMethod = il.DefineLabel ();
il.DeclareLocal (CompilerServices.TObject);
ilPC.DeclareLocal (CompilerServices.TObject);//used for checking propery less bindings
ilPC.DeclareLocal (typeof(MemberInfo));//used for checking propery less bindings
System.Reflection.Emit.Label cancel = ilPC.DefineLabel ();
#region Unregister previous parent event handler
//unregister previous parent handler if not null
ilPC.Emit (OpCodes.Ldarg_2);//load old parent
ilPC.Emit (OpCodes.Ldfld, CompilerServices.fiDSCOldDS);
ilPC.Emit (OpCodes.Brfalse, cancel);//old parent is null
ilPC.Emit (OpCodes.Ldarg_2);//load old parent
ilPC.Emit (OpCodes.Ldfld, CompilerServices.fiDSCOldDS);
//Load cached delegate
ilPC.Emit(OpCodes.Ldarg_0);//load ref to this instanciator onto the stack
ilPC.Emit(OpCodes.Ldfld, CompilerServices.fiTemplateBinding);
//add template bindings dynValueChanged delegate to new parent event
ilPC.Emit(OpCodes.Callvirt, CompilerServices.eiValueChange.RemoveMethod);//call remove event
#endregion
ilPC.MarkLabel(cancel);
#region check if new parent is null
cancel = ilPC.DefineLabel ();
ilPC.Emit (OpCodes.Ldarg_2);//load datasource change arg
ilPC.Emit (OpCodes.Ldfld, CompilerServices.fiDSCNewDS);
ilPC.Emit (OpCodes.Brfalse, cancel);//new ds is null
#endregion
int i = 0;
foreach (KeyValuePair<string, List<MemberAddress>> bindingCase in bindings ) {
System.Reflection.Emit.Label nextTest = il.DefineLabel ();
#region member name test
//load source member name
il.Emit (OpCodes.Ldarg_1);
il.Emit (OpCodes.Ldfld, CompilerServices.fiVCMbName);
il.Emit (OpCodes.Ldstr, bindingCase.Key);//load name to test
il.Emit (OpCodes.Ldc_I4_4);//StringComparison.Ordinal
il.Emit (OpCodes.Callvirt, CompilerServices.stringEquals);
il.Emit (OpCodes.Brfalse, nextTest);//if not equal, jump to next case
#endregion
#region destination member affectations
foreach (MemberAddress ma in bindingCase.Value) {
if (ma.Address.Count == 0){
Debug.WriteLine("\t\tBUG: reverse template binding in normal template binding");
continue;//template binding
}
//first we try to get memberInfo of new parent, if it doesn't exist, it's a propery less binding
ilPC.Emit (OpCodes.Ldarg_2);//load new parent onto the stack for handler addition
ilPC.Emit (OpCodes.Ldfld, CompilerServices.fiDSCNewDS);
ilPC.Emit (OpCodes.Stloc_0);//save new parent
//get parent type
ilPC.Emit (OpCodes.Ldloc_0);//push parent instance
ilPC.Emit (OpCodes.Ldstr, bindingCase.Key);//load member name
ilPC.Emit (OpCodes.Call, CompilerServices.miGetMembIinfoWithRefx);
ilPC.Emit (OpCodes.Stloc_1);//save memberInfo
ilPC.Emit (OpCodes.Ldloc_1);//push mi for test if null
System.Reflection.Emit.Label propLessReturn = ilPC.DefineLabel ();
ilPC.Emit (OpCodes.Brfalse, propLessReturn);
//first we have to load destination instance onto the stack, it is access
//with graphic tree functions deducted from nodes topology
il.Emit (OpCodes.Ldarg_0);//load source instance of ValueChanged event
CompilerServices.emitGetChild (il, typeof(TemplatedControl), -1);
CompilerServices.emitGetInstance (il, ma.Address);
ilPC.Emit (OpCodes.Ldarg_2);//load destination instance to set actual value of member
ilPC.Emit (OpCodes.Ldfld, CompilerServices.fiDSCNewDS);
CompilerServices.emitGetChild (ilPC, typeof(TemplatedControl), -1);
CompilerServices.emitGetInstance (ilPC, ma.Address);
//load new value
il.Emit (OpCodes.Ldarg_1);
il.Emit (OpCodes.Ldfld, CompilerServices.fiVCNewValue);
//for the parent changed dyn meth we need to fetch actual value for initialisation thrue reflexion
ilPC.Emit (OpCodes.Ldloc_0);//push root instance of instanciator as parentChanged source
ilPC.Emit (OpCodes.Ldloc_1);//push mi for value fetching
ilPC.Emit (OpCodes.Call, CompilerServices.miGetValWithRefx);
CompilerServices.emitConvert (il, ma.Property.PropertyType);
CompilerServices.emitConvert (ilPC, ma.Property.PropertyType);
il.Emit (OpCodes.Callvirt, ma.Property.GetSetMethod());
ilPC.Emit (OpCodes.Callvirt, ma.Property.GetSetMethod());
ilPC.MarkLabel(propLessReturn);
}
#endregion
il.Emit (OpCodes.Br, endMethod);
il.MarkLabel (nextTest);
i++;
}
//il.Emit (OpCodes.Pop);
il.MarkLabel (endMethod);
il.Emit (OpCodes.Ret);
//store template bindings in instanciator
templateBinding = dm.CreateDelegate (typeof(EventHandler<ValueChangeEventArgs>));
#region emit LogicalParentChanged method
//load new parent onto the stack for handler addition
ilPC.Emit (OpCodes.Ldarg_2);
ilPC.Emit (OpCodes.Ldfld, CompilerServices.fiDSCNewDS);
//Load cached delegate
ilPC.Emit(OpCodes.Ldarg_0);//load ref to this instanciator onto the stack
ilPC.Emit(OpCodes.Ldfld, CompilerServices.fiTemplateBinding);
//add template bindings dynValueChanged delegate to new parent event
ilPC.Emit(OpCodes.Callvirt, CompilerServices.eiValueChange.AddMethod);//call add event
ilPC.MarkLabel (cancel);
ilPC.Emit (OpCodes.Ret);
//store dschange delegate in instatiator instance for access while instancing graphic object
int delDSIndex = cachedDelegates.Count;
cachedDelegates.Add(dmPC.CreateDelegate (CompilerServices.ehTypeDSChange, this));
#endregion
ctx.emitCachedDelegateHandlerAddition(delDSIndex, CompilerServices.eiLogicalParentChanged);
}
void emitTemplateLoad(Context ctx, string tmpXml)
{
//if its a template, first read template elements
using (XmlTextReader reader = new XmlTextReader (tmpXml, XmlNodeType.Element, null)) {
List<string[]> itemTemplateIds = new List<string[]> ();
bool inlineTemplate = false;
string templatePath = reader.GetAttribute ("Template");
reader.Read ();
int depth = reader.Depth + 1;
while (reader.Read ()) {
if (!reader.IsStartElement () || reader.Depth > depth)
continue;
if (reader.Name == "Template") {
inlineTemplate = true;
reader.Read ();
readChildren (reader, ctx, -1);
} else if (reader.Name == "ItemTemplate") {
string dataType = "default", datas = "", path = "";
while (reader.MoveToNextAttribute ()) {
if (reader.Name == "DataType")
dataType = reader.Value;
else if (reader.Name == "Data")
datas = reader.Value;
else if (reader.Name == "Path")
path = reader.Value;
}
reader.MoveToElement ();
string itemTmpID;
if (string.IsNullOrEmpty (path)) {
itemTmpID = Guid.NewGuid ().ToString ();
Interface.Instantiators [itemTmpID] =
new ItemTemplate (new MemoryStream (Encoding.UTF8.GetBytes (reader.ReadInnerXml ())), dataType, datas);
} else {
if (!reader.IsEmptyElement)
throw new Exception ("ItemTemplate with Path attribute may not include sub nodes");
itemTmpID = path;
Interface.Instantiators [itemTmpID] =
new ItemTemplate (Interface.GetStreamFromPath (itemTmpID), dataType, datas);
}
itemTemplateIds.Add (new string [] { dataType, itemTmpID, datas });
}
}
if (!inlineTemplate) {//load from path or default template
ctx.il.Emit (OpCodes.Ldloc_0);//Load current templatedControl ref
if (string.IsNullOrEmpty (templatePath)) {
ctx.il.Emit (OpCodes.Ldnull);//default template loading
} else {
ctx.il.Emit (OpCodes.Ldarg_1);//load currentInterface
ctx.il.Emit (OpCodes.Ldstr, templatePath); //Load template path string
ctx.il.Emit (OpCodes.Callvirt,//call Interface.Load(path)
CompilerServices.miIFaceLoad);
}
ctx.il.Emit (OpCodes.Callvirt, CompilerServices.miLoadTmp);//load template
}
//copy item templates (review this)
foreach (string [] iTempId in itemTemplateIds) {
ctx.il.Emit (OpCodes.Ldloc_0);//load TempControl ref
ctx.il.Emit (OpCodes.Ldfld, CompilerServices.fldItemTemplates);//load ItemTemplates dic field
ctx.il.Emit (OpCodes.Ldstr, iTempId [0]);//load key
ctx.il.Emit (OpCodes.Ldstr, iTempId [1]);//load value
ctx.il.Emit (OpCodes.Callvirt, CompilerServices.miGetITemp);
ctx.il.Emit (OpCodes.Callvirt, CompilerServices.miAddITemp);
if (!string.IsNullOrEmpty (iTempId [2])) {
//expand delegate creation
ctx.il.Emit (OpCodes.Ldloc_0);//load TempControl ref
ctx.il.Emit (OpCodes.Ldfld, CompilerServices.fldItemTemplates);
ctx.il.Emit (OpCodes.Ldstr, iTempId [0]);//load key
ctx.il.Emit (OpCodes.Callvirt, CompilerServices.miGetITempFromDic);
ctx.il.Emit (OpCodes.Ldloc_0);//load root of treeView
ctx.il.Emit (OpCodes.Callvirt, CompilerServices.miCreateExpDel);
}
}
}
}
void emitLoader(XmlTextReader reader, Context ctx)
{
string tmpXml = reader.ReadOuterXml ();
if (ctx.nodesStack.Peek().HasTemplate)
emitTemplateLoad (ctx, tmpXml);
emitGOLoad (ctx, tmpXml);
//emitCheckAndBindValueChanged (ctx);
}
void emitPropertyBindings(Context ctx, NodeAddress origine, Dictionary<string, List<MemberAddress>> bindings)
{
Type origineNodeType = origine.NodeType;
//value changed dyn method
DynamicMethod dm = new DynamicMethod ("dyn_valueChanged" + NewId,
typeof (void), CompilerServices.argsValueChange, true);
ILGenerator il = dm.GetILGenerator (256);
System.Reflection.Emit.Label endMethod = il.DefineLabel ();
il.DeclareLocal (CompilerServices.TObject);
il.Emit (OpCodes.Nop);
int i = 0;
foreach (KeyValuePair<string, List<MemberAddress>> bindingCase in bindings ) {
System.Reflection.Emit.Label nextTest = il.DefineLabel ();
#region member name test
//load source member name
il.Emit (OpCodes.Ldarg_1);
il.Emit (OpCodes.Ldfld, CompilerServices.fiVCMbName);
il.Emit (OpCodes.Ldstr, bindingCase.Key);//load name to test
il.Emit (OpCodes.Ldc_I4_4);//StringComparison.Ordinal
il.Emit (OpCodes.Callvirt, CompilerServices.stringEquals);
il.Emit (OpCodes.Brfalse, nextTest);//if not equal, jump to next case
#endregion
#region destination member affectations
PropertyInfo piOrig = origineNodeType.GetProperty (bindingCase.Key);
Type origineType = null;
if (piOrig != null)
origineType = piOrig.PropertyType;
foreach (MemberAddress ma in bindingCase.Value) {
//first we have to load destination instance onto the stack, it is access
//with graphic tree functions deducted from nodes topology
il.Emit (OpCodes.Ldarg_0);//load source instance of ValueChanged event
NodeAddress destination = ma.Address;
if (destination.Count == 0){//template reverse binding
//fetch destination instance (which is the template root)
for (int j = 0; j < origine.Count ; j++)
il.Emit(OpCodes.Callvirt, CompilerServices.miGetLogicalParent);
}else
CompilerServices.emitGetInstance (il, origine, destination);
if (origineType != null && destination.Count > 0){//else, prop less binding or reverse template bind, no init requiered
//for initialisation dynmeth, push destination instance loc_0 is root node in ctx
ctx.il.Emit(OpCodes.Ldloc_0);
CompilerServices.emitGetInstance (ctx.il, destination);
//init dynmeth: load actual value from origine
ctx.il.Emit (OpCodes.Ldloc_0);
CompilerServices.emitGetInstance (ctx.il, origine);
ctx.il.Emit (OpCodes.Callvirt, origineNodeType.GetProperty (bindingCase.Key).GetGetMethod());
}
//load new value
il.Emit (OpCodes.Ldarg_1);
il.Emit (OpCodes.Ldfld, CompilerServices.fiVCNewValue);
if (origineType == null)//property less binding, no init
CompilerServices.emitConvert (il, ma.Property.PropertyType);
else if (destination.Count > 0) {
if (origineType.IsValueType)
ctx.il.Emit(OpCodes.Box, origineType);
CompilerServices.emitConvert (ctx.il, origineType, ma.Property.PropertyType);
CompilerServices.emitConvert (il, origineType, ma.Property.PropertyType);
ctx.il.Emit (OpCodes.Callvirt, ma.Property.GetSetMethod());//set init value
} else {// reverse templateBinding
il.Emit (OpCodes.Ldstr, ma.memberName);//arg 3 of setValueWithReflexion
il.Emit (OpCodes.Call, CompilerServices.miSetValWithRefx);
continue;
}
il.Emit (OpCodes.Callvirt, ma.Property.GetSetMethod());//set value on value changes
}
#endregion
il.Emit (OpCodes.Br, endMethod);
il.MarkLabel (nextTest);
i++;
}
il.MarkLabel (endMethod);
il.Emit (OpCodes.Ret);
//store and emit Add in ctx
int dmIdx = cachedDelegates.Count;
cachedDelegates.Add (dm.CreateDelegate (typeof(EventHandler<ValueChangeEventArgs>)));
ctx.emitCachedDelegateHandlerAddition (dmIdx, CompilerServices.eiValueChange, origine);
}
/// <summary> Emits handler method bindings </summary>
void emitHandlerBinding(Context ctx, EventInfo sourceEvent, string expression)
{
NodeAddress currentNode = ctx.CurrentNodeAddress;
BindingDefinition bindingDef = splitBindingExp (currentNode, sourceEvent.Name, expression);
#if DEBUG_BINDING
Debug.WriteLine("Event Binding: " + bindingDef.ToString());
#endif
if (bindingDef.IsTemplateBinding | bindingDef.IsDataSourceBinding) {
//we need to bind datasource method to source event
DynamicMethod dm = new DynamicMethod ("dyn_dschangedForHandler" + NewId,
typeof(void),
CompilerServices.argsBoundDSChange, true);
ILGenerator il = dm.GetILGenerator (256);
System.Reflection.Emit.Label cancel = il.DefineLabel ();
il.DeclareLocal (typeof(MethodInfo));//used to cancel binding if method doesn't exist
il.Emit (OpCodes.Nop);
emitRemoveOldDataSourceHandler (il, sourceEvent.Name, bindingDef.TargetMember, false);
//fetch method in datasource and test if it exist
il.Emit (OpCodes.Ldarg_2);//load new datasource
il.Emit (OpCodes.Ldfld, CompilerServices.fiDSCNewDS);
il.Emit (OpCodes.Brfalse, cancel);//cancel if new datasource is null
il.Emit (OpCodes.Ldarg_2);//load new datasource
il.Emit (OpCodes.Ldfld, CompilerServices.fiDSCNewDS);
il.Emit (OpCodes.Ldstr, bindingDef.TargetMember);//load handler method name
il.Emit (OpCodes.Call, CompilerServices.miGetMethInfoWithRefx);
il.Emit (OpCodes.Stloc_0);//save MethodInfo
il.Emit (OpCodes.Ldloc_0);//push mi for test if null
il.Emit (OpCodes.Brfalse, cancel);
il.Emit (OpCodes.Ldarg_1);//load datasource change source where the event is as 1st arg of handler.add
if (bindingDef.IsTemplateBinding)//fetch source instance with address
CompilerServices.emitGetInstance (il, bindingDef.SourceNA);
//load handlerType of sourceEvent to create delegate (1st arg)
il.Emit (OpCodes.Ldtoken, sourceEvent.EventHandlerType);
il.Emit (OpCodes.Call, CompilerServices.miGetTypeFromHandle);
il.Emit (OpCodes.Ldarg_2);//load new datasource where the method is defined
il.Emit (OpCodes.Ldfld, CompilerServices.fiDSCNewDS);
il.Emit (OpCodes.Ldloc_0);//load methodInfo (3rd arg)
il.Emit (OpCodes.Callvirt, CompilerServices.miCreateBoundDel);
il.Emit (OpCodes.Callvirt, sourceEvent.AddMethod);//call add event
System.Reflection.Emit.Label finish = il.DefineLabel ();
il.Emit (OpCodes.Br, finish);
il.MarkLabel (cancel);
il.EmitWriteLine (string.Format ("Handler method '{0}' for '{1}' not found in new dataSource ", bindingDef.TargetMember, sourceEvent.Name));
il.MarkLabel (finish);
il.Emit (OpCodes.Ret);
//store dschange delegate in instatiator instance for access while instancing graphic object
int delDSIndex = cachedDelegates.Count;
cachedDelegates.Add (dm.CreateDelegate (CompilerServices.ehTypeDSChange, this));
if (bindingDef.IsDataSourceBinding)
ctx.emitCachedDelegateHandlerAddition (delDSIndex, CompilerServices.eiDSChange);
else //template handler binding, will be added to root parentChanged
templateCachedDelegateIndices.Add (delDSIndex);
} else {//normal in tree handler binding, store until tree is complete (end of parse)
ctx.UnresolvedTargets.Add (new EventBinding (
bindingDef.SourceNA, sourceEvent,
bindingDef.TargetNA, bindingDef.TargetMember, bindingDef.TargetName));
}
}
void emitGOLoad(Context ctx, string tmpXml)
{
using (XmlTextReader reader = new XmlTextReader (tmpXml, XmlNodeType.Element, null)) {
reader.Read ();
#region Styling and default values loading
if (reader.HasAttributes) {
string style = reader.GetAttribute ("Style");
if (!string.IsNullOrEmpty (style))
CompilerServices.EmitSetValue (ctx.il, CompilerServices.piStyle, style);
}
ctx.il.Emit (OpCodes.Ldloc_0);
ctx.il.Emit (OpCodes.Callvirt, CompilerServices.miLoadDefaultVals);
#endregion
#region Attributes reading
if (reader.HasAttributes) {
while (reader.MoveToNextAttribute ()) {
if (reader.Name == "Style")
continue;
MemberInfo mi = ctx.CurrentNodeType.GetMember (reader.Name).FirstOrDefault ();
if (mi == null)
throw new Exception ("Member '" + reader.Name + "' not found in " + ctx.CurrentNodeType.Name);
if (mi.MemberType == MemberTypes.Event) {
foreach (string exp in CompilerServices.splitOnSemiColumnOutsideAccolades(reader.Value)) {
string trimed = exp.Trim();
if (trimed.StartsWith ("{", StringComparison.OrdinalIgnoreCase))
compileAndStoreDynHandler (ctx, mi as EventInfo, trimed.Substring (1, trimed.Length - 2));
else
emitHandlerBinding (ctx, mi as EventInfo, trimed);
}
continue;
}
PropertyInfo pi = mi as PropertyInfo;
if (pi == null)
throw new Exception ("Member '" + reader.Name + "' is not a property in " + ctx.CurrentNodeType.Name);
if (pi.Name == "Name")
ctx.StoreCurrentName (reader.Value);
if (reader.Value.StartsWith ("{", StringComparison.OrdinalIgnoreCase))
readPropertyBinding (ctx, reader.Name, reader.Value.Substring (1, reader.Value.Length - 2));
else
CompilerServices.EmitSetValue (ctx.il, pi, reader.Value);
}
reader.MoveToElement ();
}
#endregion
readChildren (reader, ctx);
ctx.nodesStack.ResetCurrentNodeIndex ();
}
}
/// <summary>
/// create the valuechanged handler, the datasourcechanged handler and emit event handling
/// </summary>
void emitDataSourceBindings(Context ctx, BindingDefinition bindingDef)
{
DynamicMethod dm = null;
ILGenerator il = null;
int dmVC = 0;
PropertyInfo piSource = ctx.CurrentNodeType.GetProperty(bindingDef.SourceMember);
//if no dataSource member name is provided, valuechange is not handle and datasource change
//will be used as origine value
string delName = "dyn_DSvalueChanged" + NewId;
if (!string.IsNullOrEmpty(bindingDef.TargetMember)){
#region create valuechanged method
dm = new DynamicMethod (delName,
typeof (void),
CompilerServices.argsBoundValueChange, true);
il = dm.GetILGenerator (256);
System.Reflection.Emit.Label endMethod = il.DefineLabel ();
il.DeclareLocal (CompilerServices.TObject);
il.Emit (OpCodes.Nop);
//load value changed member name onto the stack
il.Emit (OpCodes.Ldarg_2);
il.Emit (OpCodes.Ldfld, CompilerServices.fiVCMbName);
//test if it's the expected one
il.Emit (OpCodes.Ldstr, bindingDef.TargetMember);
il.Emit (OpCodes.Ldc_I4_4);//StringComparison.Ordinal
il.Emit (OpCodes.Callvirt, CompilerServices.stringEquals);
il.Emit (OpCodes.Brfalse, endMethod);
//set destination member with valueChanged new value
//load destination ref
il.Emit (OpCodes.Ldarg_0);
//load new value onto the stack
il.Emit (OpCodes.Ldarg_2);
il.Emit (OpCodes.Ldfld, CompilerServices.fiVCNewValue);
//by default, source value type is deducted from target member type to allow
//memberless binding, if targetMember exists, it will be used to determine target
//value type for conversion
CompilerServices.emitConvert (il, piSource.PropertyType);
il.Emit (OpCodes.Callvirt, piSource.GetSetMethod ());
il.MarkLabel (endMethod);
il.Emit (OpCodes.Ret);
//vc dyn meth is stored in a cached list, it will be bound to datasource only
//when datasource of source graphic object changed
dmVC = dsValueChangedDynMeths.Count;
dsValueChangedDynMeths.Add (dm);
#endregion
}
#region emit dataSourceChanged event handler
//now we create the datasource changed method that will init the destination member with
//the actual value of the origin member of the datasource and then will bind the value changed
//dyn methode.
//dm is bound to the instanciator instance to have access to cached dyn meth and delegates
dm = new DynamicMethod ("dyn_dschanged",
typeof (void),
CompilerServices.argsBoundDSChange, true);
il = dm.GetILGenerator (256);
il.DeclareLocal (CompilerServices.TObject);//used for checking propery less bindings
il.DeclareLocal (typeof(MemberInfo));//used for checking propery less bindings
System.Reflection.Emit.Label cancel = il.DefineLabel ();
System.Reflection.Emit.Label cancelInit = il.DefineLabel ();
il.Emit (OpCodes.Nop);
emitRemoveOldDataSourceHandler(il, "ValueChanged", delName);
if (!string.IsNullOrEmpty(bindingDef.TargetMember)){
if (bindingDef.TwoWay){
System.Reflection.Emit.Label cancelRemove = il.DefineLabel ();
//remove handler if not null
il.Emit (OpCodes.Ldarg_2);//load old parent
il.Emit (OpCodes.Ldfld, CompilerServices.fiDSCOldDS);
il.Emit (OpCodes.Brfalse, cancelRemove);//old parent is null
//remove handler
il.Emit (OpCodes.Ldarg_2);//1st arg load old datasource
il.Emit (OpCodes.Ldfld, CompilerServices.fiDSCOldDS);
il.Emit (OpCodes.Ldstr, "ValueChanged");//2nd arg event name
il.Emit (OpCodes.Ldarg_1);//3d arg: instance bound to delegate (the source)
il.Emit (OpCodes.Call, CompilerServices.miRemEvtHdlByTarget);
il.MarkLabel(cancelRemove);
}
il.Emit (OpCodes.Ldarg_2);//load datasource change arg
il.Emit (OpCodes.Ldfld, CompilerServices.fiDSCNewDS);
il.Emit (OpCodes.Brfalse, cancel);//new ds is null
}
#region fetch initial Value
if (!string.IsNullOrEmpty(bindingDef.TargetMember)){
il.Emit (OpCodes.Ldarg_2);//load new datasource
il.Emit (OpCodes.Ldfld, CompilerServices.fiDSCNewDS);
il.Emit (OpCodes.Ldstr, bindingDef.TargetMember);//load member name
il.Emit (OpCodes.Call, CompilerServices.miGetMembIinfoWithRefx);
il.Emit (OpCodes.Stloc_1);//save memberInfo
il.Emit (OpCodes.Ldloc_1);//push mi for test if null
il.Emit (OpCodes.Brfalse, cancelInit);//propertyLessBinding
}
il.Emit (OpCodes.Ldarg_1);//load source of dataSourceChanged which is the dest instance
il.Emit (OpCodes.Ldarg_2);//load new datasource
il.Emit (OpCodes.Ldfld, CompilerServices.fiDSCNewDS);
if (!string.IsNullOrEmpty(bindingDef.TargetMember)){
il.Emit (OpCodes.Ldloc_1);//push mi for value fetching
il.Emit (OpCodes.Call, CompilerServices.miGetValWithRefx);
}
CompilerServices.emitConvert (il, piSource.PropertyType);
il.Emit (OpCodes.Callvirt, piSource.GetSetMethod ());
#endregion
if (!string.IsNullOrEmpty(bindingDef.TargetMember)){
il.MarkLabel(cancelInit);
//check if new dataSource implement IValueChange
il.Emit (OpCodes.Ldarg_2);//load new datasource
il.Emit (OpCodes.Ldfld, CompilerServices.fiDSCNewDS);
il.Emit (OpCodes.Isinst, typeof(IValueChange));
il.Emit (OpCodes.Brfalse, cancel);
il.Emit(OpCodes.Ldarg_0);//load ref to this instanciator onto the stack
il.Emit (OpCodes.Ldarg_1);//load datasource change source
il.Emit (OpCodes.Ldarg_2);//load new datasource
il.Emit (OpCodes.Ldfld, CompilerServices.fiDSCNewDS);
il.Emit(OpCodes.Ldc_I4, dmVC);//load index of dynmathod
il.Emit (OpCodes.Call, CompilerServices.miDSChangeEmitHelper);
if (bindingDef.TwoWay){
il.Emit (OpCodes.Ldarg_1);//arg1: dataSourceChange source, the origine of the binding
il.Emit (OpCodes.Ldstr, bindingDef.SourceMember);//arg2: orig member
il.Emit (OpCodes.Ldarg_2);//arg3: new datasource
il.Emit (OpCodes.Ldfld, CompilerServices.fiDSCNewDS);
il.Emit (OpCodes.Ldstr, bindingDef.TargetMember);//arg4: dest member
il.Emit (OpCodes.Call, CompilerServices.miDSReverseBinding);
}
il.MarkLabel (cancel);
}
il.Emit (OpCodes.Ret);
//store dschange delegate in instatiator instance for access while instancing graphic object
int delDSIndex = cachedDelegates.Count;
cachedDelegates.Add(dm.CreateDelegate (CompilerServices.ehTypeDSChange, this));
#endregion
ctx.emitCachedDelegateHandlerAddition(delDSIndex, CompilerServices.eiDSChange);
}
/// <summary>
/// Create and store in the instanciator the ValueChanged delegates
/// those delegates uses grtree functions to set destination value so they don't
/// need to be bound to destination instance as in the ancient system.
/// </summary>
void emitBindingDelegates(Context ctx)
{
foreach (KeyValuePair<NodeAddress,Dictionary<string, List<MemberAddress>>> bindings in ctx.Bindings ) {
if (bindings.Key.Count == 0)//template binding
emitTemplateBindings (ctx, bindings.Value);
else
emitPropertyBindings (ctx, bindings.Key, bindings.Value);
}
}
/// <summary>
/// Compile events expression in IML attributes, and store the result in the instanciator
/// Those handlers will be bound when instatiing
/// </summary>
void compileAndStoreDynHandler(Context ctx, EventInfo sourceEvent, string expression)
{
//store event handler dynamic method in instanciator
int dmIdx = cachedDelegates.Count;
cachedDelegates.Add (CompilerServices.compileDynEventHandler (sourceEvent, expression, ctx.CurrentNodeAddress));
ctx.emitCachedDelegateHandlerAddition(dmIdx, sourceEvent);
}