VOP/VOP_Switch.h

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#ifndef __VOP_Switch_h__
#define __VOP_Switch_h__

#include <VOP/VOP_Node.h>

/// @file
/// This example contains code which shows how to perform some of the most
/// common tasks when writing a custom VEX code operator. It produces code
/// which selects one of the inputs to feed to the output.
namespace HDK_Sample {

/// C++ VOP node to select one of its inputs and feed it into the output.
class VOP_Switch : public VOP_Node
{
public:
    /// Creates an instance of this node with the given name in the given network.
    static OP_Node              *myConstructor(OP_Network *net,
                                               const char *name,
                                               OP_Operator *entry);

    /// Our parameter templates.
    static PRM_Template          myTemplateList[];

    /// Disable our parameters based on which inputs are connected.
    bool         updateParmsFlags() override;

    /// Generate the code for this operator.
    void         getCode(UT_String &codestr,
                         const VOP_CodeGenContext &context) override;

    /// Provides the labels to appear on input and output buttons.
    const char  *inputLabel(unsigned idx) const override;
    const char  *outputLabel(unsigned idx) const override;

    /// Controls the number of input buttons visible on the node tile.
    unsigned     getNumVisibleInputs() const override;

    /// Returns the index of the first "unordered" input, meaning that inputs
    /// before this one should not be collapsed when they are disconnected.
    unsigned     orderedInputs() const override;

protected:
    VOP_Switch(OP_Network *net, const char *name, OP_Operator *entry);
    ~VOP_Switch() override;

    /// Returns the internal name of the supplied input. This input name is
    /// used when the code generator substitutes variables return by getCode.
    void         getInputNameSubclass(UT_String &in, int idx) const override;
    /// Reverse mapping of internal input names to an input index.
    int          getInputFromNameSubclass(const UT_String &in) const override;
    /// Fills in the info about the vop type connected to the idx-th input.
    void         getInputTypeInfoSubclass(VOP_TypeInfo &type_info, 
                                          int idx) override;

    /// Returns the internal name of the supplied output. This name is used
    /// when the code generator substitutes variables return by getCode.
    void         getOutputNameSubclass(UT_String &out, int idx) const override;
    /// Fills out the info about the data type of each output connector.
    void         getOutputTypeInfoSubclass(VOP_TypeInfo &type_info, 
                                           int idx) override;

    /// This methods should be overriden in most VOP nodes. It should fill
    /// in voptypes vector with vop types that are allowed to be connected
    /// to this node at the input at index idx. Note that 
    /// this method should return valid vop types even when nothing is 
    /// connected to the corresponding input.
    void         getAllowedInputTypeInfosSubclass(unsigned idx,
                                    VOP_VopTypeInfoArray &type_infos) override;

    /// Accesses the parameter that controls how out of bounds switch indices
    /// are handled.
    int         OUTOFBOUNDS();
};

}       // End of HDK_Sample namespace

#endif