Timer Device - A nice and compact UI element to quickly realize a count down timer.

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Here described for ShellExecute but might be also realized as generic device or for Homeduino.

The Ui should contain from left to right
(Don’t know to add pictures, so I had a nice illustration)

• name
• elapsed time
• remaining time (optional as edit field)
• slider to change remaining time quickly
  -optional up/down buttons to change remaining time
• flip switch to start stop timer

The timer is already started it can be resceduled by chaning the value without switching off.

Here a rough draft to explain the idea

{ 
  "id": "party-timer",
  "name": "Party Timer",
  "class": "ShellTimer",
  
  "unit": "minutes",
  "unitname": "min",

  "min": 0,		
  "max": 240,	

  "remain": 50,	
  "elapse": 190,	
  
  "onCommand": "echo start with $this.remain $this.unitname",
  "offCommand": "echo off",
  "changeCommand": "echo changed value to $this.remain $this.unitname"   
  "getStateCommand": "echo 50",  
  "interval": "20000"
}

Some explanations:
unit - the unit for the timer calculation, can be seconds, minutes, hours, days
unitname - string to display for unit

min - the minum value which can be entered in the UI
max - the maximum value which can be entered in the UI

remain - the remaining time until switch off, shown and editable in UI
elapse - actual time since start of timer, might be greater than max in case of resceduling, shown in the UI

getStateCommand - rescedule timer, only in range of min to max, -1: keep unchanged
interval - for the getStateCommand

In order to confirm my request I will describe my current workaround:

For realizing one timer with the above mentioned requirements I currently need

• 3 Devices:
  • ShellSwitch for on and off
  • ButtonsDevice for changing the duration with an up and down button (poor interface increasing and decreasing duration by 10
  • VariablesDevice to shows total duration and remaining time (and may be later elapsed time)
• 2 Variables for duration and remaining time
• 8 Rules for start, stop, increase, decrease, count down, range checking under different conditions

The count down rule is still buggy (see issue #529 on github) but it works with some restrictions in usage.

Off cause some things can make via the menu, like changing/observing variables or rules but it is less comfortable for daily use.

Maybe I have overseen something to make things easier but I am just in the beginning of learning Pimatic.