trigger clip playback on the GUI

[Benny Lyons]

Story: Trigger Playback

As a Lumiera developer
I want to click on the playback button on the GUI
So that a playback command is sent down into the Steam layer, ready to be dispatched to the player component

Acceptance Criteria

Scenario-1: send from the Stage Layer a playback command to UI-Bus

Given

• a Lumiera running environment
• And a playback button on the GUI
• And a "playback"-command definition bound to that button

When

the playback button is activated

Then

A playback command is sent into the UI-Bus

[Ichthyostega]

Review: change acceptance criteria;
Playback is considered transient interaction state, and as such, only creates a command, but not a persistent Action on the action log

[Benny Lyons]

This ticket starts life in the Stage and finishes in the Steam: component set to lumieraGui, someone might prefer to change this to lumiera later

[Ichthyostega]

It seems to me the further scenarios are besides the point.

• the connection from the UI-Bus to the Steam Dispatcher is another story
  ...in fact this is already implemented
• there is no possibility for the Steam Dispatcher not to process the command
  ...rather that's just a question of time (since it happens asynchronous)
• anything beyond the Steam Dispatcher are further stories,
  ...we have repackaged them already as #1232 and #1233

[Undercover Agent]

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