No way to define event type for a new trigger

[yochay]

When creating a new Trigger, we used to allow developer to choose the even type. That drop down is missing from property form for Trigger

[yochay]

There is a DCR on the SDK microsoft/botbuilder-dotnet#2326 that we can use Composer to make a call on what we expose via Composer vs. SDK.

@sangwoohaan, what would be a good way to design generic 'advance' topics for drop downs / multi-choice options in Composer.

Suggesting to surface the following:

Name	Description	Base event	Constraint	Use case	Keep ?
OnEvent	Generic event handler
OnIntent		RecognizedIntent	turn.recognized.intent == 'IntentName'
OnUnknownIntent		UnknownIntent
OnBeginDialog		BeginDialog	N/A
OnConversationUpdateActivity		ActivityRecieved	ActivityTypes.ConversationUpdate

These can be surfaced under 'advance'

Name	Description	Base event	Constraint	Use case	Keep ?
OnActivity \/		ActivityRecieved	N/A
OnEndOfConversationActivity		ActivityRecieved	ActivityTypes.EndOfConversation
OnEventActivity		ActivityRecieved	ActivityTypes.Event
OnHandoffActivity		ActivityRecieved	ActivityTypes.Handoff
OnInvokeActivity		ActivityRecieved	ActivityTypes.Invoke
OnMessageActivity		ActivityRecieved	ActivityTypes.Message
OnMessageDeletionActivity		ActivityRecieved	ActivityTypes.MessageDeletion
OnMessageReactionActivity		ActivityRecieved	ActivityTypes.MessageReaction
OnMessageUpdateActivity		ActivityRecieved	ActivityTypes.MessageUpdate
OnTypingActivity		ActivityRecieved	ActivityTypes.Typing

[sangwoohaan]

Related to #825? @luhan2017 and I are gonna talk about this next week

[a-b-r-o-w-n]

@sangwoohaan @yochay We should explore a similar UX to the new prompts editor.

[sangwoohaan]

Do we need to give special treatment to OnBeginDialog and OnConversationUpdateActivity when we automatically create them for the users? OnCoversationUpdateActivity is create for root dialogs, and OnBeginDialog for sub dialogs. I suggest we only surface OnIntent, OnEvent, OnUnknownIntent, and put everything under OnEvent as sub-selection. Thoughts? @yochay @cwhitten @luhan2017