internal void ConnectStyleEvent(XamlClrEventNode xamlClrEventNode)
{
CodeConditionStatement ccsConnector = null;
// validate the event handler name per C# grammar for identifiers
ValidateEventHandlerName(xamlClrEventNode.EventName, xamlClrEventNode.Value);
EnsureStyleConnector();
if (!xamlClrEventNode.IsSameScope)
{
int connectionId = xamlClrEventNode.ConnectionId;
if (SwitchStatementSupported())
{
// break any previous case staements as we are starting a new connection scope.
if (_ccRoot.StyleConnectorFn.Statements.Count > 1)
{
CodeSnippetStatement cssBreak = new CodeSnippetStatement(BREAK_STATEMENT);
_ccRoot.StyleConnectorFn.Statements.Add(cssBreak);
}
// case 1:
//
CodeSnippetStatement cssCase = new CodeSnippetStatement(CASE_STATEMENT + connectionId + COLON);
_ccRoot.StyleConnectorFn.Statements.Add(cssCase);
}
else
{
// if (connectionId == 1)
//
ccsConnector = new CodeConditionStatement();
ccsConnector.Condition = new CodeBinaryOperatorExpression(new CodeArgumentReferenceExpression(CONNECTIONID),
CodeBinaryOperatorType.ValueEquality,
new CodePrimitiveExpression(connectionId));
}
}
else if (!SwitchStatementSupported())
{
// if in the same scope then use the if statement that was last generated
// at the start of the scope
Debug.Assert(_ccRoot.StyleConnectorFn.Statements.Count > 0);
ccsConnector = _ccRoot.StyleConnectorFn.Statements[_ccRoot.StyleConnectorFn.Statements.Count - 1] as CodeConditionStatement;
Debug.Assert(ccsConnector != null);
}
CodeArgumentReferenceExpression careTarget = new CodeArgumentReferenceExpression(TARGET);
if (xamlClrEventNode.IsStyleSetterEvent)
{
// EventSetter declaration only once to avoid warning!
if (!_hasEmittedEventSetterDeclaration)
{
_hasEmittedEventSetterDeclaration = true;
// EventSetter eventSetter;
//
CodeVariableDeclarationStatement cvdsES = new CodeVariableDeclarationStatement(KnownTypes.Types[(int)KnownElements.EventSetter], EVENTSETTER);
_ccRoot.StyleConnectorFn.Statements.Insert(0, cvdsES);
}
// eventSetter = new EventSetter();
//
CodeExpression[] esParams = {};
CodeVariableReferenceExpression cvreES = new CodeVariableReferenceExpression(EVENTSETTER);
CodeAssignStatement casES = new CodeAssignStatement(cvreES,
new CodeObjectCreateExpression(KnownTypes.Types[(int)KnownElements.EventSetter],
esParams));
// eventSetter.Event = Button.ClickEvent;
//
CodePropertyReferenceExpression cpreEvent = new CodePropertyReferenceExpression(cvreES, EVENT);
CodeAssignStatement casEvent = new CodeAssignStatement(cpreEvent,
GetEvent(xamlClrEventNode.EventMember,
xamlClrEventNode.EventName,
xamlClrEventNode.Value));
// eventSetter.Handler = new RoutedEventHandler(OnClick);
//
CodePropertyReferenceExpression cpreHandler = new CodePropertyReferenceExpression(cvreES, HANDLER);
CodeAssignStatement casHandler = new CodeAssignStatement(cpreHandler,
GetEventDelegate(null,
xamlClrEventNode.EventMember,
xamlClrEventNode.EventName,
xamlClrEventNode.Value));
AddLinePragma(casHandler, xamlClrEventNode.LineNumber);
// ((Style)target).Setters.Add(eventSetter);
//
CodeCastExpression cceTarget = new CodeCastExpression(KnownTypes.Types[(int)KnownElements.Style], careTarget);
CodePropertyReferenceExpression cpreSetters = new CodePropertyReferenceExpression(cceTarget, SETTERS);
CodeMethodInvokeExpression cmieAdd = new CodeMethodInvokeExpression(cpreSetters, ADD, cvreES);
if (SwitchStatementSupported())
{
_ccRoot.StyleConnectorFn.Statements.Add(casES);
_ccRoot.StyleConnectorFn.Statements.Add(casEvent);
_ccRoot.StyleConnectorFn.Statements.Add(casHandler);
_ccRoot.StyleConnectorFn.Statements.Add(new CodeExpressionStatement(cmieAdd));
}
else
{
ccsConnector.TrueStatements.Add(casES);
ccsConnector.TrueStatements.Add(casEvent);
ccsConnector.TrueStatements.Add(casHandler);
ccsConnector.TrueStatements.Add(new CodeExpressionStatement(cmieAdd));
// Only add if statement at start of new scope
if (!xamlClrEventNode.IsSameScope)
{
_ccRoot.StyleConnectorFn.Statements.Add(ccsConnector);
}
}
}
else
{
//
// ((Foo)target).Bar += new BarEventHandler(OnBar);
//
// *or*
//
// ((Foo)target).AddHandler( Baz.BarEvent, new BarEventHandler(OnBar));
//
CodeCastExpression cceTarget;
Type eventTarget;
// Create the markup event information
MarkupEventInfo mei = new MarkupEventInfo( xamlClrEventNode.Value, // Event handler string
xamlClrEventNode.EventName, // Event name string
xamlClrEventNode.EventMember, // MemberInfo
xamlClrEventNode.LineNumber); // LineNumber
// Get the type that defines the event (e.g. typeof(Button) for Button.Clicked or typeof(Mouse) for Mouse.MouseMove)
eventTarget = xamlClrEventNode.ListenerType;
// Create the type cast expression "(Foo)target"
cceTarget = new CodeCastExpression( eventTarget, careTarget);
// Create the whole code statement (either in += form or in AddHandler form)
CodeStatement csAddCLREvent = AddCLREvent( eventTarget, null, cceTarget, mei );
if (SwitchStatementSupported())
{
_ccRoot.StyleConnectorFn.Statements.Add( csAddCLREvent );
}
else
{
ccsConnector.TrueStatements.Add( csAddCLREvent );
// Only add if statement at start of new scope
if (!xamlClrEventNode.IsSameScope)
{
_ccRoot.StyleConnectorFn.Statements.Add(ccsConnector);
}
}
}
}
internal void AddApplicationEvent(MarkupEventInfo mei)
{
// validate the event handler name per C# grammar for identifiers
ValidateEventHandlerName(mei.eventName, mei.eventHandler);
// this.FooEvent += new FooEventHandlerDelegate(this.OnFoo);
CodeThisReferenceExpression ctre = new CodeThisReferenceExpression();
CodeStatement csEvent = AddCLREvent(_ccRoot, ctre, mei);
Debug.Assert(_ccRoot == (_codeContexts.Peek() as CodeContextRoot));
_ccRoot.EnsureInitializeComponentFn.Statements.Add(csEvent);
}
private CodeStatement AddCLREvent(Type eventTarget, CodeContext cc, CodeExpression ce, MarkupEventInfo mei)
{
bool subClassed = _ccRoot.SubClass.Length > 0;
CodeStatement csEvent = null;
// param2: <FooEventHandler>
CodeExpression cDelExp = GetEventDelegate(cc, mei.mi, mei.eventName, mei.eventHandler);
if (mei.mi.DeclaringType.IsAssignableFrom(eventTarget))
{
// _element.FooEvent += new FooEventHandlerDelegate(OnFoo);
csEvent = new CodeAttachEventStatement(ce, mei.eventName, cDelExp);
}
else if (eventTarget == null || // for known attached events on unknown local tags
KnownTypes.Types[(int)KnownElements.UIElement].IsAssignableFrom(eventTarget) ||
KnownTypes.Types[(int)KnownElements.ContentElement].IsAssignableFrom(eventTarget))
{
// _element.AddHandler(FooEvent, new FooEventHandlerDelegate(OnFoo));
CodeFieldReferenceExpression cfreEvent = GetEvent(mei.mi, mei.eventName, mei.eventHandler);
CodeMethodInvokeExpression cmieAddHandler = new CodeMethodInvokeExpression(ce, ADDHANDLER, cfreEvent, cDelExp);
csEvent = new CodeExpressionStatement(cmieAddHandler);
}
else
{
string eventTargetName = eventTarget != null ? eventTarget.FullName : cc.LocalElementFullName;
ThrowCompilerException(SRID.UnknownEventAttribute, mei.eventName, mei.eventHandler, eventTargetName);
}
// When x:SubClass is used, event handlers can be specified in a code-behind file, under this sub class.
// But these handler methods need to be accessible from the intermediary generated sub class. So an empty
// internal virtual method with the same signature as the handler method is generated in this intermediary
// sub class (in the generated file):
//
// internal virtual void OnFooEvent(object sender, FooEventArgs ea)
// {
// }
//
// Since a delegate cannot take the address of a virtual function, a non-virtual helper function
// with the same signature as the above function & which calls the above function is also generated:
//
// private void OnFooEventHelper(object sender, FooEventArgs ea)
// {
// OnFooEvent(sender, ea);
// }
//
// All this is done only if x:Subclass is specified, since this means that this sub class would need to be
// defined in a code-behind file. This also means that inline events (in <x:Code>) will not be supported.
if (subClassed)
{
GenerateProtectedEventHandlerMethod(mei);
}
AddLinePragma(csEvent, mei.lineNumber);
return csEvent;
}
private void GenerateProtectedEventHandlerMethod(MarkupEventInfo mei)
{
Debug.Assert(_ccRoot != null && _ccRoot.SubClass.Length > 0);
// Fetch the EventHandlerType from either the EventInfo or the MethodInfo
// for the Add{Propertyname}Handler method's MethodInfo
Type eventHandlerType = GetEventHandlerType(mei.mi);
MethodInfo methodInvoke = eventHandlerType.GetMethod("Invoke");
ParameterInfo[] pars = methodInvoke.GetParameters();
CodeMemberMethod cmmEventHandler = new CodeMemberMethod();
CodeMemberMethod cmmEventHandlerHelper = new CodeMemberMethod();
AddDebuggerNonUserCodeAttribute(cmmEventHandlerHelper);
AddGeneratedCodeAttribute(cmmEventHandlerHelper);
cmmEventHandler.Attributes = MemberAttributes.Assembly | MemberAttributes.Overloaded;
cmmEventHandler.ReturnType = new CodeTypeReference(typeof(void));
cmmEventHandler.Name = mei.eventHandler.Trim();
CodeMethodInvokeExpression cmieOnEvent = new CodeMethodInvokeExpression(null, cmmEventHandler.Name);
for (int i = 0; i < pars.Length; i++)
{
CodeParameterDeclarationExpression param = new CodeParameterDeclarationExpression(pars[i].ParameterType, pars[i].Name);
cmmEventHandler.Parameters.Add(param);
cmmEventHandlerHelper.Parameters.Add(param);
cmieOnEvent.Parameters.Add(new CodeArgumentReferenceExpression(pars[i].Name));
}
//
// internal virtual void OnFooEvent(object sender, FooEventArgs ea)
// {
// }
//
_ccRoot.CodeClass.Members.Add(cmmEventHandler);
cmmEventHandlerHelper.Name = cmmEventHandler.Name + HELPER;
cmmEventHandlerHelper.ReturnType = new CodeTypeReference(typeof(void));
cmmEventHandlerHelper.Statements.Add(new CodeExpressionStatement(cmieOnEvent));
//
// private void OnFooEventHelper(object sender, FooEventArgs ea)
// {
// OnFooEvent(sender, ea);
// }
//
_ccRoot.CodeClass.Members.Add(cmmEventHandlerHelper);
}
private CodeStatement AddCLREvent(CodeContext cc, CodeExpression ce, MarkupEventInfo mei)
{
// Infer the event target's (aka the listener) type from the current code context
return AddCLREvent( cc.ElementType, cc, ce, mei );
}
