X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FMain%2Ffg_props.hxx;h=1f9a1f87d0e7781c6e27a0fbc54bef9f29a590cb;hb=dc132d80b19614f729f6e35bbf4423db90728c4c;hp=9e794d384ce4738b064f9fdd339af11261e9af5f;hpb=94f745e3ea7282696b7384b3b7519a561b187589;p=flightgear.git diff --git a/src/Main/fg_props.hxx b/src/Main/fg_props.hxx index 9e794d384..1f9a1f87d 100644 --- a/src/Main/fg_props.hxx +++ b/src/Main/fg_props.hxx @@ -1,16 +1,66 @@ +// fg_props.hxx - Declarations and inline methods for property handling. +// Written by David Megginson, started 2000. +// +// This file is in the Public Domain, and comes with no warranty. + #ifndef __FG_PROPS_HXX #define __FG_PROPS_HXX 1 #include #include +#include + #include "globals.hxx" //////////////////////////////////////////////////////////////////////// -// Loading and saving properties. +// Property management. //////////////////////////////////////////////////////////////////////// -extern bool fgSaveFlight (ostream &output); + +/** + * Initialize the default FlightGear properties. + * + * These are mostly properties that haven't been claimed by a + * specific module yet. This function should be invoked once, + * while the program is starting (and after the global property + * tree has been created). + */ +extern void fgInitProps (); // fixme: how are they untied? + + +/** + * Update the default FlightGear properties. + * + * This function should be invoked once in each loop to update all + * of the default properties. + */ +extern void fgUpdateProps (); + + +/** + * Save a flight to disk. + * + * This function saves all of the archivable properties to a stream + * so that the current flight can be restored later. + * + * @param output The output stream to write the XML save file to. + * @param write_all If true, write all properties rather than + * just the ones flagged as archivable. + * @return true if the flight was saved successfully. + */ +extern bool fgSaveFlight (ostream &output, bool write_all = false); + + +/** + * Load a flight from disk. + * + * This function loads an XML save file from a stream to restore + * a flight. + * + * @param input The input stream to read the XML from. + * @return true if the flight was restored successfully. + */ extern bool fgLoadFlight (istream &input); @@ -19,169 +69,351 @@ extern bool fgLoadFlight (istream &input); // Convenience functions for getting property values. //////////////////////////////////////////////////////////////////////// - /** * Get a property node. * * @param path The path of the node, relative to root. * @param create true to create the node if it doesn't exist. + * @return The node, or 0 if none exists and none was created. */ -inline SGPropertyNode * -fgGetNode (const string &path, bool create = false) -{ - return globals->get_props()->getNode(path, create); -} +extern SGPropertyNode * fgGetNode (const char * path, bool create = false); /** - * Get an SGValue pointer that can be queried repeatedly. + * Get a property node with separate index. * - * If the property value is going to be accessed within the loop, - * it is best to use this method for maximum efficiency. + * This method separates the index from the path string, to make it + * easier to iterate through multiple components without using sprintf + * to add indices. For example, fgGetNode("foo[1]/bar", 3) will + * return the same result as fgGetNode("foo[1]/bar[3]"). + * + * @param path The path of the node, relative to root. + * @param index The index for the last member of the path (overrides + * any given in the string). + * @param create true to create the node if it doesn't exist. + * @return The node, or 0 if none exists and none was created. */ -inline SGValue * -fgGetValue (const string &name, bool create = false) -{ - return globals->get_props()->getValue(name, create); -} +extern SGPropertyNode * fgGetNode (const char * path, + int index, bool create = false); -inline bool fgHasValue (const string &name) -{ - return globals->get_props()->hasValue(name); -} -inline bool fgGetBool (const string &name, bool defaultValue = false) -{ - return globals->get_props()->getBoolValue(name, defaultValue); -} +/** + * Test whether a given node exists. + * + * @param path The path of the node, relative to root. + * @return true if the node exists, false otherwise. + */ +extern bool fgHasNode (const char * path); -inline int fgGetInt (const string &name, int defaultValue = 0) -{ - return globals->get_props()->getIntValue(name, defaultValue); -} -inline int fgGetLong (const string &name, long defaultValue = 0L) -{ - return globals->get_props()->getLongValue(name, defaultValue); -} +/** + * Add a listener to a node. + * + * @param listener The listener to add to the node. + * @param path The path of the node, relative to root. + * @param index The index for the last member of the path (overrides + * any given in the string). + */ +extern void fgAddChangeListener (SGPropertyChangeListener * listener, + const char * path); -inline float fgGetFloat (const string &name, float defaultValue = 0.0) -{ - return globals->get_props()->getFloatValue(name, defaultValue); -} -inline double fgGetDouble (const string &name, double defaultValue = 0.0) -{ - return globals->get_props()->getDoubleValue(name, defaultValue); -} +/** + * Add a listener to a node. + * + * @param listener The listener to add to the node. + * @param path The path of the node, relative to root. + * @param index The index for the last member of the path (overrides + * any given in the string). + */ +extern void fgAddChangeListener (SGPropertyChangeListener * listener, + const char * path, int index); -inline string fgGetString (const string &name, string defaultValue = "") -{ - return globals->get_props()->getStringValue(name, defaultValue); -} -inline bool fgSetBool (const string &name, bool val) -{ - return globals->get_props()->setBoolValue(name, val); -} +/** + * Get a bool value for a property. + * + * This method is convenient but inefficient. It should be used + * infrequently (i.e. for initializing, loading, saving, etc.), + * not in the main loop. If you need to get a value frequently, + * it is better to look up the node itself using fgGetNode and then + * use the node's getBoolValue() method, to avoid the lookup overhead. + * + * @param name The property name. + * @param defaultValue The default value to return if the property + * does not exist. + * @return The property's value as a bool, or the default value provided. + */ +extern bool fgGetBool (const char * name, bool defaultValue = false); -inline bool fgSetInt (const string &name, int val) -{ - return globals->get_props()->setIntValue(name, val); -} -inline bool fgSetLong (const string &name, long val) -{ - return globals->get_props()->setLongValue(name, val); -} +/** + * Get an int value for a property. + * + * This method is convenient but inefficient. It should be used + * infrequently (i.e. for initializing, loading, saving, etc.), + * not in the main loop. If you need to get a value frequently, + * it is better to look up the node itself using fgGetNode and then + * use the node's getIntValue() method, to avoid the lookup overhead. + * + * @param name The property name. + * @param defaultValue The default value to return if the property + * does not exist. + * @return The property's value as an int, or the default value provided. + */ +extern int fgGetInt (const char * name, int defaultValue = 0); -inline bool fgSetFloat (const string &name, float val) -{ - return globals->get_props()->setFloatValue(name, val); -} -inline bool fgSetDouble (const string &name, double val) -{ - return globals->get_props()->setDoubleValue(name, val); -} +/** + * Get a long value for a property. + * + * This method is convenient but inefficient. It should be used + * infrequently (i.e. for initializing, loading, saving, etc.), + * not in the main loop. If you need to get a value frequently, + * it is better to look up the node itself using fgGetNode and then + * use the node's getLongValue() method, to avoid the lookup overhead. + * + * @param name The property name. + * @param defaultValue The default value to return if the property + * does not exist. + * @return The property's value as a long, or the default value provided. + */ +extern int fgGetLong (const char * name, long defaultValue = 0L); + + +/** + * Get a float value for a property. + * + * This method is convenient but inefficient. It should be used + * infrequently (i.e. for initializing, loading, saving, etc.), + * not in the main loop. If you need to get a value frequently, + * it is better to look up the node itself using fgGetNode and then + * use the node's getFloatValue() method, to avoid the lookup overhead. + * + * @param name The property name. + * @param defaultValue The default value to return if the property + * does not exist. + * @return The property's value as a float, or the default value provided. + */ +extern float fgGetFloat (const char * name, float defaultValue = 0.0); + + +/** + * Get a double value for a property. + * + * This method is convenient but inefficient. It should be used + * infrequently (i.e. for initializing, loading, saving, etc.), + * not in the main loop. If you need to get a value frequently, + * it is better to look up the node itself using fgGetNode and then + * use the node's getDoubleValue() method, to avoid the lookup overhead. + * + * @param name The property name. + * @param defaultValue The default value to return if the property + * does not exist. + * @return The property's value as a double, or the default value provided. + */ +extern double fgGetDouble (const char * name, double defaultValue = 0.0); + + +/** + * Get a string value for a property. + * + * This method is convenient but inefficient. It should be used + * infrequently (i.e. for initializing, loading, saving, etc.), + * not in the main loop. If you need to get a value frequently, + * it is better to look up the node itself using fgGetNode and then + * use the node's getStringValue() method, to avoid the lookup overhead. + * + * @param name The property name. + * @param defaultValue The default value to return if the property + * does not exist. + * @return The property's value as a string, or the default value provided. + */ +extern const char * fgGetString (const char * name, + const char * defaultValue = ""); + + +/** + * Set a bool value for a property. + * + * Assign a bool value to a property. If the property does not + * yet exist, it will be created and its type will be set to + * BOOL; if it has a type of UNKNOWN, the type will also be set to + * BOOL; otherwise, the bool value will be converted to the property's + * type. + * + * @param name The property name. + * @param val The new value for the property. + * @return true if the assignment succeeded, false otherwise. + */ +extern bool fgSetBool (const char * name, bool val); + + +/** + * Set an int value for a property. + * + * Assign an int value to a property. If the property does not + * yet exist, it will be created and its type will be set to + * INT; if it has a type of UNKNOWN, the type will also be set to + * INT; otherwise, the bool value will be converted to the property's + * type. + * + * @param name The property name. + * @param val The new value for the property. + * @return true if the assignment succeeded, false otherwise. + */ +extern bool fgSetInt (const char * name, int val); + + +/** + * Set a long value for a property. + * + * Assign a long value to a property. If the property does not + * yet exist, it will be created and its type will be set to + * LONG; if it has a type of UNKNOWN, the type will also be set to + * LONG; otherwise, the bool value will be converted to the property's + * type. + * + * @param name The property name. + * @param val The new value for the property. + * @return true if the assignment succeeded, false otherwise. + */ +extern bool fgSetLong (const char * name, long val); -inline bool fgSetString (const string &name, const string &val) -{ - return globals->get_props()->setStringValue(name, val); -} + +/** + * Set a float value for a property. + * + * Assign a float value to a property. If the property does not + * yet exist, it will be created and its type will be set to + * FLOAT; if it has a type of UNKNOWN, the type will also be set to + * FLOAT; otherwise, the bool value will be converted to the property's + * type. + * + * @param name The property name. + * @param val The new value for the property. + * @return true if the assignment succeeded, false otherwise. + */ +extern bool fgSetFloat (const char * name, float val); + + +/** + * Set a double value for a property. + * + * Assign a double value to a property. If the property does not + * yet exist, it will be created and its type will be set to + * DOUBLE; if it has a type of UNKNOWN, the type will also be set to + * DOUBLE; otherwise, the double value will be converted to the property's + * type. + * + * @param name The property name. + * @param val The new value for the property. + * @return true if the assignment succeeded, false otherwise. + */ +extern bool fgSetDouble (const char * name, double val); + + +/** + * Set a string value for a property. + * + * Assign a string value to a property. If the property does not + * yet exist, it will be created and its type will be set to + * STRING; if it has a type of UNKNOWN, the type will also be set to + * STRING; otherwise, the string value will be converted to the property's + * type. + * + * @param name The property name. + * @param val The new value for the property. + * @return true if the assignment succeeded, false otherwise. + */ +extern bool fgSetString (const char * name, const char * val); //////////////////////////////////////////////////////////////////////// -// Convenience functions for tying properties, with logging. +// Convenience functions for setting property attributes. //////////////////////////////////////////////////////////////////////// -inline void -fgUntie (const string &name) -{ - if (!globals->get_props()->untie(name)) - SG_LOG(SG_GENERAL, SG_WARN, "Failed to untie property " << name); -} +/** + * Set the state of the archive attribute for a property. + * + * If the archive attribute is true, the property will be written + * when a flight is saved; if it is false, the property will be + * skipped. + * + * A warning message will be printed if the property does not exist. + * + * @param name The property name. + * @param state The state of the archive attribute (defaults to true). + */ +extern void fgSetArchivable (const char * name, bool state = true); - // Templates cause ambiguity here -inline void -fgTie (const string &name, bool *pointer, bool useDefault = true) -{ - if (!globals->get_props()->tie(name, SGRawValuePointer(pointer), - useDefault)) - SG_LOG(SG_GENERAL, SG_WARN, - "Failed to tie property " << name << " to a pointer"); -} -inline void -fgTie (const string &name, int *pointer, bool useDefault = true) -{ - if (!globals->get_props()->tie(name, SGRawValuePointer(pointer), - useDefault)) - SG_LOG(SG_GENERAL, SG_WARN, - "Failed to tie property " << name << " to a pointer"); -} +/** + * Set the state of the read attribute for a property. + * + * If the read attribute is true, the property value will be readable; + * if it is false, the property value will always be the default value + * for its type. + * + * A warning message will be printed if the property does not exist. + * + * @param name The property name. + * @param state The state of the read attribute (defaults to true). + */ +extern void fgSetReadable (const char * name, bool state = true); -inline void -fgTie (const string &name, long *pointer, bool useDefault = true) -{ - if (!globals->get_props()->tie(name, SGRawValuePointer(pointer), - useDefault)) - SG_LOG(SG_GENERAL, SG_WARN, - "Failed to tie property " << name << " to a pointer"); -} -inline void -fgTie (const string &name, float *pointer, bool useDefault = true) -{ - if (!globals->get_props()->tie(name, SGRawValuePointer(pointer), - useDefault)) - SG_LOG(SG_GENERAL, SG_WARN, - "Failed to tie property " << name << " to a pointer"); -} +/** + * Set the state of the write attribute for a property. + * + * If the write attribute is true, the property value may be modified + * (depending on how it is tied); if the write attribute is false, the + * property value may not be modified. + * + * A warning message will be printed if the property does not exist. + * + * @param name The property name. + * @param state The state of the write attribute (defaults to true). + */ +extern void fgSetWritable (const char * name, bool state = true); -inline void -fgTie (const string &name, double *pointer, bool useDefault = true) -{ - if (!globals->get_props()->tie(name, SGRawValuePointer(pointer), - useDefault)) - SG_LOG(SG_GENERAL, SG_WARN, - "Failed to tie property " << name << " to a pointer"); -} -inline void -fgTie (const string &name, string *pointer, bool useDefault = true) -{ - if (!globals->get_props()->tie(name, SGRawValuePointer(pointer), - useDefault)) - SG_LOG(SG_GENERAL, SG_WARN, - "Failed to tie property " << name << " to a pointer"); -} + +//////////////////////////////////////////////////////////////////////// +// Convenience functions for tying properties, with logging. +//////////////////////////////////////////////////////////////////////// + + +/** + * Untie a property from an external data source. + * + * Classes should use this function to release control of any + * properties they are managing. + */ +extern void fgUntie (const char * name); + +/** + * Tie a property to a pair of simple functions. + * + * Every time the property value is queried, the getter (if any) will + * be invoked; every time the property value is modified, the setter + * (if any) will be invoked. The getter can be 0 to make the property + * unreadable, and the setter can be 0 to make the property + * unmodifiable. + * + * @param name The property name to tie (full path). + * @param getter The getter function, or 0 if the value is unreadable. + * @param setter The setter function, or 0 if the value is unmodifiable. + * @param useDefault true if the setter should be invoked with any existing + * property value should be; false if the old value should be + * discarded; defaults to true. + */ template inline void -fgTie (const string &name, V (*getter)(), void (*setter)(V) = 0, +fgTie (const char * name, V (*getter)(), void (*setter)(V) = 0, bool useDefault = true) { if (!globals->get_props()->tie(name, SGRawValueFunctions(getter, setter), @@ -190,9 +422,28 @@ fgTie (const string &name, V (*getter)(), void (*setter)(V) = 0, "Failed to tie property " << name << " to functions"); } + +/** + * Tie a property to a pair of indexed functions. + * + * Every time the property value is queried, the getter (if any) will + * be invoked with the index provided; every time the property value + * is modified, the setter (if any) will be invoked with the index + * provided. The getter can be 0 to make the property unreadable, and + * the setter can be 0 to make the property unmodifiable. + * + * @param name The property name to tie (full path). + * @param index The integer argument to pass to the getter and + * setter functions. + * @param getter The getter function, or 0 if the value is unreadable. + * @param setter The setter function, or 0 if the value is unmodifiable. + * @param useDefault true if the setter should be invoked with any existing + * property value should be; false if the old value should be + * discarded; defaults to true. + */ template inline void -fgTie (const string &name, int index, V (*getter)(int), +fgTie (const char * name, int index, V (*getter)(int), void (*setter)(int, V) = 0, bool useDefault = true) { if (!globals->get_props()->tie(name, @@ -204,9 +455,29 @@ fgTie (const string &name, int index, V (*getter)(int), "Failed to tie property " << name << " to indexed functions"); } + +/** + * Tie a property to a pair of object methods. + * + * Every time the property value is queried, the getter (if any) will + * be invoked; every time the property value is modified, the setter + * (if any) will be invoked. The getter can be 0 to make the property + * unreadable, and the setter can be 0 to make the property + * unmodifiable. + * + * @param name The property name to tie (full path). + * @param obj The object whose methods should be invoked. + * @param getter The object's getter method, or 0 if the value is + * unreadable. + * @param setter The object's setter method, or 0 if the value is + * unmodifiable. + * @param useDefault true if the setter should be invoked with any existing + * property value should be; false if the old value should be + * discarded; defaults to true. + */ template inline void -fgTie (const string &name, T * obj, V (T::*getter)() const, +fgTie (const char * name, T * obj, V (T::*getter)() const, void (T::*setter)(V) = 0, bool useDefault = true) { if (!globals->get_props()->tie(name, @@ -216,9 +487,29 @@ fgTie (const string &name, T * obj, V (T::*getter)() const, "Failed to tie property " << name << " to object methods"); } + +/** + * Tie a property to a pair of indexed object methods. + * + * Every time the property value is queried, the getter (if any) will + * be invoked with the index provided; every time the property value + * is modified, the setter (if any) will be invoked with the index + * provided. The getter can be 0 to make the property unreadable, and + * the setter can be 0 to make the property unmodifiable. + * + * @param name The property name to tie (full path). + * @param obj The object whose methods should be invoked. + * @param index The integer argument to pass to the getter and + * setter methods. + * @param getter The getter method, or 0 if the value is unreadable. + * @param setter The setter method, or 0 if the value is unmodifiable. + * @param useDefault true if the setter should be invoked with any existing + * property value should be; false if the old value should be + * discarded; defaults to true. + */ template inline void -fgTie (const string &name, T * obj, int index, +fgTie (const char * name, T * obj, int index, V (T::*getter)(int) const, void (T::*setter)(int, V) = 0, bool useDefault = true) { @@ -233,5 +524,162 @@ fgTie (const string &name, T * obj, int index, } + +//////////////////////////////////////////////////////////////////////// +// Conditions. +//////////////////////////////////////////////////////////////////////// + + +/** + * An encoded condition. + * + * This class encodes a single condition of some sort, possibly + * connected with properties. + * + * This class should migrate to somewhere more general. + */ +class FGCondition +{ +public: + FGCondition (); + virtual ~FGCondition (); + virtual bool test () const = 0; +}; + + +/** + * Condition for a single property. + * + * This condition is true only if the property returns a boolean + * true value. + */ +class FGPropertyCondition : public FGCondition +{ +public: + FGPropertyCondition (const char * propname); + virtual ~FGPropertyCondition (); + virtual bool test () const { return _node->getBoolValue(); } +private: + const SGPropertyNode * _node; +}; + + +/** + * Condition for a 'not' operator. + * + * This condition is true only if the child condition is false. + */ +class FGNotCondition : public FGCondition +{ +public: + // transfer pointer ownership + FGNotCondition (FGCondition * condition); + virtual ~FGNotCondition (); + virtual bool test () const; +private: + FGCondition * _condition; +}; + + +/** + * Condition for an 'and' group. + * + * This condition is true only if all of the conditions + * in the group are true. + */ +class FGAndCondition : public FGCondition +{ +public: + FGAndCondition (); + virtual ~FGAndCondition (); + virtual bool test () const; + // transfer pointer ownership + virtual void addCondition (FGCondition * condition); +private: + vector _conditions; +}; + + +/** + * Condition for an 'or' group. + * + * This condition is true if at least one of the conditions in the + * group is true. + */ +class FGOrCondition : public FGCondition +{ +public: + FGOrCondition (); + virtual ~FGOrCondition (); + virtual bool test () const; + // transfer pointer ownership + virtual void addCondition (FGCondition * condition); +private: + vector _conditions; +}; + + +/** + * Abstract base class for property comparison conditions. + */ +class FGComparisonCondition : public FGCondition +{ +public: + enum Type { + LESS_THAN, + GREATER_THAN, + EQUALS + }; + FGComparisonCondition (Type type, bool reverse = false); + virtual ~FGComparisonCondition (); + virtual bool test () const; + virtual void setLeftProperty (const char * propname); + virtual void setRightProperty (const char * propname); + // will make a local copy + virtual void setRightValue (const SGPropertyNode * value); +private: + Type _type; + bool _reverse; + const SGPropertyNode * _left_property; + const SGPropertyNode * _right_property; + const SGPropertyNode * _right_value; +}; + + +/** + * Base class for a conditional components. + * + * This class manages the conditions and tests; the component should + * invoke the test() method whenever it needs to decide whether to + * active itself, draw itself, and so on. + */ +class FGConditional +{ +public: + FGConditional (); + virtual ~FGConditional (); + // transfer pointer ownership + virtual void setCondition (FGCondition * condition); + virtual const FGCondition * getCondition () const { return _condition; } + virtual bool test () const; +private: + FGCondition * _condition; +}; + + +/** + * Global function to make a condition out of properties. + * + * The top-level is always an implicit 'and' group, whatever the + * node's name (it should usually be "condition"). + * + * @param node The top-level condition node (usually named "condition"). + * @return A pointer to a newly-allocated condition; it is the + * responsibility of the caller to delete the condition when + * it is no longer needed. + */ +FGCondition * fgReadCondition (const SGPropertyNode * node); + + #endif // __FG_PROPS_HXX