Export dialog ready

xs/src/slic3r/IProgressIndicator.hpp

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+#ifndef IPROGRESSINDICATOR_HPP
+#define IPROGRESSINDICATOR_HPP
+
+#include <string>
+#include <functional>
+
+namespace Slic3r {
+
+class IProgressIndicator {
+public:
+    using CancelFn = std::function<void(void)>;
+
+private:
+    float state_ = .0f, max_ = 1.f, step_;
+    std::function<void(void)> cancelfunc_ = [](){};
+    unsigned proc_count_ = 1;
+public:
+
+    inline virtual ~IProgressIndicator() {}
+
+    float max() const { return max_; }
+    float state() const { return state_; }
+
+    virtual void max(float maxval) { max_ = maxval; }
+    virtual void state(float val)  { state_ = val; }
+    virtual void state(unsigned st) { state_ = st * step_; }
+    virtual void states(unsigned statenum) {
+        step_ = max_ / statenum;
+    }
+
+    virtual void message(const std::string&) = 0;
+    virtual void title(const std::string&) = 0;
+
+    virtual void message_fmt(const std::string& fmt, ...);
+
+    inline void on_cancel(CancelFn func) { cancelfunc_ = func; }
+    inline void on_cancel() { cancelfunc_(); }
+
+    inline void procedure_count(unsigned pc) { proc_count_ = pc; }
+    inline unsigned procedure_count() const { return proc_count_; }
+
+    template<class T> void update(T st, const std::string& msg) {
+        message(msg); state(st);
+    }
+};
+
+}
+
+#endif // IPROGRESSINDICATOR_HPP