Adjusted visibility of printer monitor progress bar + percentage.

CURA-2064

resources/qml/MonitorButton.qml

@@ -19,6 +19,29 @@ Rectangle
     property real progress: printerConnected ? Cura.MachineManager.printerOutputDevices[0].progress : 0
     property int backendState: UM.Backend.state
 
+
+    property bool showProgress: {
+        // determine if we need to show the progress bar + percentage
+        if(!printerConnected || !printerAcceptsCommands)
+            return false;
+
+        switch(Cura.MachineManager.printerOutputDevices[0].jobState)
+        {
+            case "printing":
+            case "pre_print":  // heating, etc.
+            case "paused":
+                return true;
+            case "wait_cleanup":
+            case "ready":  // nut sure if this occurs, "" seems to be the ready state.
+            case "offline":
+            case "abort":  // note sure if this jobState actually occurs in the wild
+            case "error":  // after clicking abort you apparently get "error"
+            case "":  // ready to print
+            default:
+                return false;
+        }
+    }
+
     property variant statusColor:
     {
         if(!printerConnected || !printerAcceptsCommands)
@@ -96,7 +119,7 @@ Rectangle
         color: base.statusColor
         font: UM.Theme.getFont("large")
         text: Math.round(progress) + "%"
-        visible: printerConnected
+        visible: showProgress
     }
 
     Rectangle
@@ -110,6 +133,7 @@ Rectangle
         anchors.leftMargin: UM.Theme.getSize("default_margin").width
         radius: UM.Theme.getSize("progressbar_radius").width
         color: UM.Theme.getColor("progressbar_background")
+        visible: showProgress
 
         Rectangle
         {