comparison align/Aligner.h @ 761:6429a164b7e1 pitch-align

Schedule alignments with a small delay to avoid too much UI unresponsiveness. Also overhaul error reporting to use signals throughout.

     Q_OBJECT
 
 public:
     virtual ~Aligner() { }
 
-    virtual bool begin(QString &error) = 0;
+public slots:
+    virtual void begin() = 0;
 
 signals:
     /**
      * Emitted when alignment is successfully completed. The reference
      * and toAlign models can be queried from the alignment model.
      */
     void complete(ModelId alignmentModel); // an AlignmentModel
+
+    /**
+     * Emitted when alignment fails.
+     */
+    void failed(ModelId toAlign, QString errorText); // the toAlign model
 };
 
 #endif