The Glue42 Channels are enabled by default when registering a VBA window as a Glue42 Window. You have to provide handler implementations for the Channel related events that will be raised due to interaction with the Glue42 Window instance - changing Channels and handling Channel data updates. When the Glue42 Channels are enabled, a Channel Selector box is available in the window title bar.
Note that currently the
SetChannelSupport method only hides or shows the Channel Selector, but doesn't enable or disable the Channel support. This can be done only during window registration.
' Hiding the Channel selector. GlueWin.SetChannelSupport False
Handling Channel Change
HandleChannelChanged event is raised when the user changes the Channel using the Channel selection box in the window title bar. Use its handler to enable your app to react to Channel changes:
Private Sub GlueWin_HandleChannelChanged(ByVal GlueWindow As IGlueWindow, ByVal ChannelContext As IGlueContext, ByVal PrevChannelName As String) On Error GoTo HandleErrors Dim ChannelDataDynValue Dim NewData Dim NewChannelName As String If channel Is Nothing Then ' Do something when the user deselects a Channel. ... Else ChannelDataDynValue = ChannelContext.GetReflectData("") NewChannelName = ChannelDataDynValue("name") NewData = ChannelDataDynValue("data") ' Do something when the user selects a new Channel. ... End If Exit Sub HandleErrors: ' Handle exceptions. End Sub
Subscribing for Channel Updates
To subscribe for Channel data updates, use the
HandleChannelData event which is raised in two cases:
- when the data in the currently selected Channel is updated;
- after the
HandleChannelChangedevent, when the user switches to another Channel;
Private Sub GlueWin_HandleChannelData(ByVal GlueWindow As IGlueWindow, ByVal ChannelUpdate As IGlueContextUpdate) On Error GoTo HandleErrors Dim ChannelDataDynValue Dim Data Dim ChannelName As String ChannelDataDynValue = ChannelUpdate.GetContext.GetReflectData("") ChannelName = ChannelDataDynValue("name") Data = ChannelDataDynValue("data") ' Do something with the new data. ... Exit Sub HandleErrors: ' Handle exceptions. End Sub
To publish data to a Channel, you must update the shared context object dedicated the respective Channel. For details on how to update a shared context object, see the
Shared Contexts > Updating a Context section.
Note that you must only update the value of the
"data" property of the context object. The
"meta" properties must not be modified, because they are specifically set for each Channel.