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44 lines
1.7 KiB
C++
44 lines
1.7 KiB
C++
#ifndef COMPONENTS_LOADINGLISTENER_H
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#define COMPONENTS_LOADINGLISTENER_H
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#include <string>
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namespace Loading
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{
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class Listener
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{
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public:
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/// Set a text label to show on the loading screen.
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/// @param label The label
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/// @param important Is the label considered important to show?
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/// @note "non-important" labels may not show on screen if the loading process went so fast
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/// that the implementation decided not to show a loading screen at all. "important" labels
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/// will show in a separate message-box if the loading screen was not shown.
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virtual void setLabel (const std::string& label, bool important=false) {}
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/// Start a loading sequence. Must call loadingOff() when done.
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/// @note To get the loading screen to actually update, you must call setProgress / increaseProgress periodically.
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/// @note It is best to use the ScopedLoad object instead of using loadingOn()/loadingOff() directly,
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/// so that the loading is exception safe.
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virtual void loadingOn() {}
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virtual void loadingOff() {}
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/// Set the total range of progress (e.g. the number of objects to load).
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virtual void setProgressRange (size_t range) {}
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/// Set current progress. Valid range is [0, progressRange)
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virtual void setProgress (size_t value) {}
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/// Increase current progress, default by 1.
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virtual void increaseProgress (size_t increase = 1) {}
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};
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/// @brief Used for stopping a loading sequence when the object goes out of scope
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struct ScopedLoad
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{
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ScopedLoad(Listener* l) : mListener(l) { mListener->loadingOn(); }
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~ScopedLoad() { mListener->loadingOff(); }
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Listener* mListener;
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};
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}
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#endif
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