AP_Interface.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * NAME:        AP_Interface.h ( SI Library, C++)
 *
 * COMMENTS:
 */

#ifndef __AP_Interface__
#define __AP_Interface__

#include "SI_API.h"
#include <stdio.h>

#include <UI/UI_Object.h>

#include <UT/UT_Error.h>
#include <UT/UT_Signal.h>
#include <UT/UT_ValArray.h>
#include <UT/UT_String.h>
#include <UT/UT_WorkBuffer.h>
#include <UT/UT_SharedPtr.h>
#include <UT/UT_UniquePtr.h>

#include <utility>

class UT_Url;

class AP_Interface;
class UI_Value;
class UI_Manager;
template<typename T> class UT_SymbolMap;
class UI_Feel;
class UI_KeyDelegate;
using UI_KeyDelegateSPtr = UT_SharedPtr<UI_KeyDelegate>;
using AP_InterfaceUPtr = UT_UniquePtr<AP_Interface>;
class UI_Window;
typedef UT_SymbolMap<UI_Value *> UI_NamedValueMap;
typedef UT_SymbolMap<UI_Object *> UI_NamedObjectMap;
typedef UT_SymbolMap<UI_KeyDelegateSPtr> UI_NamedKeyDelegateMap;

/// Base class for interfaces.
/// This class' main responsibility is to maintain hash tables of named
/// UI_Feel "object symbol" and UI_Value "value symbol" items. 
class SI_API AP_Interface : public UI_Object {
public:
    AP_Interface();

    /// Construct with given name and predefined value names with corresponding
    /// interests. The actual values are not created until wireInteface() is
    /// called. Typically, initApplication() is first called to create the
    /// the values and then wireInterface() is called afterwards to attach the
    /// methods to the corresponding values.
    AP_Interface(const char *myname,
                 const char *const *names,
                 UI_EventMethod const *methods);

    ~AP_Interface() override;

    const char          *className() const override;

    /// Return the name passed in the constructor
    const UT_String     &getName() const { return myName; }

    /// Attach values names to the methods passed in the constructor.
    /// The actual UI_Value's are typically created by calling
    /// initApplication() first. If the values do not exist yet, then they are
    /// automatically created into uims (if not nullptr), else they will
    /// created in this object.
    ///
    /// This method also calls processKeyBindingProxyRequests().
    void                 wireInterface(UI_Manager *uims);

    // Removes interests from all the value names passed in the constructor.
    void                 unwireInterface(UI_Manager *uims);

    /// Turns a .ui file into UI gadgets. If quiet is true, no errors or
    /// warnings are printed. 
    bool                 readUIFile(const char *ui_filename,
                                    bool quiet = false);
    
    /// Create new preference file given its base name using standard rules
    /// (eg. in $HOME/houdiniX.Y). This may return nullptr if a .nosave file is
    /// found.
    static FILE         *createPreferenceFile(const char *filename);

    /// Read the given preference file given its base name using standard
    /// rules. The values will be initialized according to the parsed file into
    /// this object.
    bool                 readPreferenceFile(const char *pref_filename,
                                            bool quiet = false);
    
    /// Set the named value symbol to the corresponding pointer. If warn is
    /// true, then a warning will be issued if the name already exists as an
    /// object or key delegate symbol, or if the value symbol name already
    /// previously existed.
    void                 setValueSymbol(const char *symbol, UI_Value *value,
                                bool warn = true);

    /// Find the UI_Value for the given named value symbol
    UI_Value            *findValueSymbol(const char *symbol) const;

    /// Get the UI_Value for the given named value symbol, creating it if it
    /// doesn't exist yet. If 'create' is false, then getValueSymbol() is the
    /// same as findValueSymbol().
    UI_Value            *getValueSymbol(const char *symbol, int create = 1);

    /// Returns all the Symbol/UI_Value's pairs from the ValueSymbol table
    /// return array will contain nullptr values if its symbol doesn't exist.
    int                  getValueSymbols(UT_StringArray &symbols,
                                         UT_Array<UI_Value *> &values) const;

    /// Set the named object symbol to the corresponding pointer. If warn is
    /// true, then a warning will be issued if the name already exists as a
    /// value or key delegate symbol, or if the object symbol name already
    /// previously existed.
    void                 setObjectSymbol(const char *symbol, UI_Object  *who,
                                         int warn = 1);

    /// Find the UI_Object for the given object symbol name. Returns nullptr if
    /// it doesn't exist.
    UI_Object           *getObjectSymbol(const char *symbol) const;

    /// Find the UI_Feel for the given object symbol name. Returns nullptr if
    /// it doesn't exist. This is equivalent to findObject<UI_Feel*>(symbol).
    UI_Feel             *getFeelSymbol(const char *symbol) const;

    /// Find the UI_Feel for the given value pointer. Returns nullptr if
    /// it doesn't exist.
    UI_Feel             *findValueFeel( UI_Value * value) const;

    /// Returns all the Symbol/UI_Feel's pairs from the FeelSymbol table
    /// return array will contain nullptr values if its symbol doesn't exist.
    int                  getFeelSymbols(UT_StringArray &symbols,
                                         UT_Array<UI_Feel *> &feels) const;

    /// Set the named key delegate symbol to the corresponding pointer. If warn
    /// is true, then a warning will be issued if the name already exists as an
    /// object or value symbol, or if the key delegate symbol name already
    /// previously existed.
    void                 setKeyDelegateSymbol(const char *symbol,
                                UI_KeyDelegateSPtr delegate,
                                bool warn = true);

    /// Returns whether the current key delegate symbol is defined.
    bool                 hasKeyDelegateSymbol(const char *symbol) const;

    /// Find the UI_KeyDelegate for the given named key delegate symbol.
    UI_KeyDelegateSPtr   findKeyDelegateSymbol(const char *symbol) const;

    /// Get the UI_KeyDelegate for the given named key delegate symbol,
    /// creating it if it doesn't exist yet. If 'create' is false, then
    /// getKeyDelegateSymbol() is the same as findKeyDelegateSymbol().
    UI_KeyDelegateSPtr   getKeyDelegateSymbol(const char *symbol,
                                int create = 1);

    /// Delete the entry for the given object symbol name
    void                 removeObjectSymbol(const char *symbol);

    /// Delete the entry for the given value symbol name
    void                 removeValueSymbol(const char *symbol);
    
    /// Find the pointer for the given object symbol name, dynamically casted
    /// to the given template type.
    template<typename T>
    T *findObject(const char *name) const
    {
        return dynamic_cast<T *>(getObjectSymbol(name));
    }

    /// Find the pointer for the given value symbol name, dynamically casted
    /// to the given template type.
    template<typename T>
    T *findValue(const char *name) const
    {
        return dynamic_cast<T *>(findValueSymbol(name));
    }

    /// This class maintains a table of requests to assign some feels as
    /// binding proxies for other feels.
    ///
    /// Such requests often originate during the parsing of .ui files that
    /// occurs in subclass initApplication() overrides.  These requests are
    /// identified by a name, and the order in which the source and references
    /// are registered does not matter.
    ///
    /// The pointers to the feels are only temporarily stored until a call to
    /// processKeyBindingProxyRequests() occurs.  At the moment this occurs as
    /// part of the wireInterface() method.
    /// @{
    void                 setKeyBindingProxySrc(const char *symbol, UI_Feel *src,
                                               bool warn = true);
    void                 addKeyBindingProxyRef(const char *symbol, UI_Feel *ref,
                                               bool warn = true);
    /// @}

    /// Initialize this object. This method is intended to be overriden by
    /// subclasses since the base class implementation is empty. The subclass
    /// typically calls readUIFile() here to create the interface which
    /// populates the object and value symbols.
    virtual void initApplication(UI_Manager *uims,
                                 int argc,
                                 const char **argv);

    //  The outputUsage() method should simply output the usage text to
    //  the standard error stream.
    //  The application is terminated after invoking this method.
    virtual void outputUsage(int argc, const char **argv) const;

    /// Resets this object by calling unwireInterface() and then destroying all
    /// objects and values.
    void resetApplication();
    
    void                 handleEvent(UI_Event *event) override;

    // These are methods which are called only if the APP is "the"
    //  registered main application in the program.  By default, they
    //  do nothing.
    virtual int          saveAppData(const char *filename); // ret 1 on success
    virtual int          loadAppState();        // Allows app to load context
    virtual int          saveAppState();        // Allows app to save context
    virtual void         saveOnCoreDump();      // To do stuff when...yikes!
    virtual bool         getCoreDumpFileName(UT_WorkBuffer &name);

    // Utility methods for managing the common ui.pref file
    // Load the UI pref file; should be used by Main.C only.
    bool                 loadUIInitPrefs();
    // Save the current UI state to the pref file. The layout level is 
    // the desired level to be saved.
    void                 saveUIInitPrefs(
                            const char * layout_level, 
                            fpreal uiscale,
                            int playbarui);
    // Restore UI prefs from file. Similar to load but does not explicitly
    // set the layout level, which can only be done by Main.C; so this method
    // is used everywhere else to load the prefs from file.
    bool                 restoreUIInitPrefs();

    /// Menu items and their mapping for file chooser style preference.
    static const std::pair<const char *, int>   theFileChooserStyleMap[];

    // Helper methods to convert enums to labels, and vice versa.
    static int           mapStrToInt(const char *label, 
                                     const std::pair<const char *, int> *map);
    static const char *  mapIntToStr(int index, 
                                     const std::pair<const char *, int> *map);

    // If a function key is pressed and a script is attached to it,
    // this will return the script.
    //
    bool                 getFunctionKeyScript(int key, UI_Event *event,
                                             UT_String &script);

    // These static methods will get/set the exit code that the UI application
    // will exit with.  The default exit code is 0.  Note that these methods
    // are implemented in AP_Main.C.
    static void          setAppExitCode(int exit_code);
    static int           getAppExitCode();

    /// Returns @c true if the application is exiting.
    static bool          isAppExiting();

    // Returns the desktop specified by the -desktop argument.
    // Returns nullptr if no such argument was specified.
    static const char   *getStartupDesktop();
    
    // Helper class for being able to call the private installSignalHandlers().
    class InstallSignalHandlersHelper;

protected:
    static void           setTheMainApplication(AP_Interface *app);
    static AP_Interface  *getMainApplication() { return theMainApplication; }
    static void           clearTheMainApplication();

    UT_String                    myName;
    const char * const          *myValueNames;
    UI_EventMethod const        *myMethods;

    UI_NamedValueMap    *getValueTable() const  { return myValueTable;  }
    UI_NamedObjectMap   *getObjectTable() const { return myObjectTable; }

    // Processes any registered binding proxy requests.  After this call
    // the key binding proxy request table will be cleared.
    void                 processKeyBindingProxyRequests();

    // Updates the given UI_Window object using the -geometry or pref file
    static void          loadWindowGeometry(
                            UI_Window *window,
                            bool default_maximized,
                            bool use_pref);

    // Returns true if the -geometry arg was parsed out and false otherwise.
    // NOTE: The values are returned in pixels!
    static bool          getWindowGeometry(int &width, int &height, 
                                           int &left, int &bottom,
                                           bool &maximized,
                                           bool use_pref);
    static bool          getSaveWindowGeoPref();
    static void          saveWindowGeoPref();
    static bool          loadWindowGeoPref(
                            int &w, int &h, int &left, int &bottom,
                            bool &maximized);

private:
    class si_CrashHandler;
    friend class        si_CrashHandler;

    // WARNING: The installSignalHandlers() method calls UTgetInterrupt(), so
    //          should not be called before the call to UTsetInterrupt().
    static void           installSignalHandlers();
    static void           getSignalList(UT_Array<int> &signals);

    void                  assignUIInitPrefs();

    static const char    *mainApplicationName();

    static void           createCrashLog(UTsignalHandlerArg sig_arg, 
                                const char *appname, const char *filename);
    static void           terminateSignalHandler(UTsignalHandlerArg sig_arg);
    static bool           coredumpHandler(UTsignalHandlerArg sig_arg);
    static void           coreDumpChaser(UTsignalHandlerArg sig_arg);
    static void           installCallbacks();
    static void powerFailHandlerSignalHandler(UTsignalHandlerArg);
    static void powerFailHandler(
            UT_String &saved_file_name,
            const UT_StringRef &details);
    static void           terminationWarning(uint nseconds);

    static AP_Interface  *theMainApplication;

    class ProxyRequest
    {
        public:
            ProxyRequest() : myTarget(nullptr) {}

            UI_Feel                     *myTarget;
            UT_Array<UI_Feel *>          myReferences;
    };
    typedef UT_SymbolMap<ProxyRequest> NamedProxyRequestMap;

private:
    UI_NamedValueMap     *myValueTable;
    UI_NamedObjectMap    *myObjectTable;
    UI_NamedKeyDelegateMap       *myKeyDelegateTable;
    NamedProxyRequestMap         *myKeyBindingProxyRequestTable;
};


/// Base class for bootstrapping code for executable applications, with
/// the main UI implemented by an AP_Interface.
///
/// Instances are created as static objects so that the constructor runs
/// during static initialization before the main() function in AP_Main.C.
///
/// The createApplication() method will be called on any existing bootstrap
/// objects during the execution of main() to allocate an AP_Interface that
/// main() will initialize and wire, and finally destroy before terminating.
class SI_API AP_Bootstrap
{
public:
    AP_Bootstrap();
    virtual ~AP_Bootstrap();

    virtual AP_InterfaceUPtr createApplication() = 0;

protected:
    //
    //  Set the application to run in the fore or background.  This MUST
    //  be called from a static constructor (i.e. before main is run).
    //
    static void          setAppForeground();
};


// A convenience template for a trivial bootstrapper subclass that creates
// an application with a trivial constructor.
template <typename APP_T>
class AP_TrivialBootstrap : public AP_Bootstrap
{
public:
    AP_InterfaceUPtr createApplication() override
    { return UTmakeUnique<APP_T>(); }
};

extern void     APregister  (AP_Interface *app);
extern void     APderegister(AP_Interface *app);

extern void     APregister  (AP_Bootstrap *bootstrap);
extern void     APderegister(AP_Bootstrap *bootstrap);

// These template functions allow you to get & cast to the appropriate
// object/value type in one step, ie:
//
// UI_Button   *button = UIgetObject<UI_Button>(this, "button.gad");
// UI_StringList *menu = UIgetValue<UI_StringList>(this, "rmb.menu");

template<class ObjectClass> inline
ObjectClass *SIgetObject(const AP_Interface *app, const char *name)
{
    return dynamic_cast<ObjectClass *>(app->getObjectSymbol(name));
}
                                                          
template<class ValueClass> inline
ValueClass *SIgetValue(const AP_Interface *app, const char *name)
{
    return dynamic_cast<ValueClass *>(app->findValueSymbol(name));
}
                                                          
#endif