Separate Job, ProgressStatusBar and ProgressIndicator

* Separate GUI::Job
* make use of ProgressIndicator interface
* make ProgressStatusbar independent from GUI::App

src/slic3r/GUI/ProgressIndicator.hpp

@@ -11,58 +11,17 @@ namespace Slic3r {
  */
 class ProgressIndicator {
 public:
-    using CancelFn = std::function<void(void)>; // Cancel function signature.
-
-private:
-    float m_state = .0f, m_max = 1.f, m_step;
-    CancelFn m_cancelfunc = [](){};
-
-public:
-
-    inline virtual ~ProgressIndicator() {}
-
-    /// Get the maximum of the progress range.
-    float max() const { return m_max; }
-
-    /// Get the current progress state
-    float state() const { return m_state; }
-
-    /// Set the maximum of the progress range
-    virtual void max(float maxval) { m_max = maxval; }
-
-    /// Set the current state of the progress.
-    virtual void state(float val)  { m_state = val; }
-
-    /**
-     * @brief Number of states int the progress. Can be used instead of giving a
-     * maximum value.
-     */
-    virtual void states(unsigned statenum) {
-        m_step = m_max / statenum;
-    }
-
-    /// Message shown on the next status update.
-    virtual void message(const std::string&) = 0;
-
-    /// Title of the operation.
-    virtual void title(const std::string&) = 0;
-
-    /// Formatted message for the next status update. Works just like sprintf.
-    virtual void message_fmt(const std::string& fmt, ...);
-
-    /// Set up a cancel callback for the operation if feasible.
-    virtual void on_cancel(CancelFn func = CancelFn()) { m_cancelfunc = func; }
-
-    /**
-     * Explicitly shut down the progress indicator and call the associated
-     * callback.
-     */
-    virtual void cancel() { m_cancelfunc(); }
-
-    /// Convenience function to call message and status update in one function.
-    void update(float st, const std::string& msg) {
-        message(msg); state(st);
-    }
+    
+    /// Cancel callback function type
+    using CancelFn = std::function<void()>;
+    
+    virtual ~ProgressIndicator() = default;
+    
+    virtual void set_range(int range) = 0;
+    virtual void set_cancel_callback(CancelFn = CancelFn()) = 0;
+    virtual void set_progress(int pr) = 0;
+    virtual void set_status_text(const char *) = 0; // utf8 char array
+    virtual int  get_range() const = 0;
 };
 
 }