f6bcfd974e
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@7748 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
446 lines
13 KiB
TeX
446 lines
13 KiB
TeX
\section{\class{wxVariant}}\label{wxvariant}
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The {\bf wxVariant} class represents a container for any type.
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A variant's value can be changed at run time, possibly to a different type of value.
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As standard, wxVariant can store values of type bool, char, double, long, string,
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string list, time, date, void pointer, list of strings, and list of variants. However, an application can extend
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wxVariant's capabilities by deriving from the class \helpref{wxVariantData}{wxvariantdata} and
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using the wxVariantData form of the wxVariant constructor or assignment operator
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to assign this data to a variant. Actual values for user-defined types will need to be accessed
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via the wxVariantData object, unlike the case for basic data types where convenience
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functions such as GetLong can be used.
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This class is useful for reducing the programming for certain tasks, such as an editor
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for different data types, or a remote procedure call protocol.
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An optional name member is associated with a wxVariant. This might be used, for example, in CORBA
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or OLE automation classes, where named parameters are required.
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wxVariant is similar to wxExpr and also to wxPropertyValue. However, wxExpr is efficiency-optimized for
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a restricted range of data types, whereas wxVariant is less efficient but more extensible.
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wxPropertyValue may be replaced by wxVariant eventually.
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\wxheading{Derived from}
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\helpref{wxObject}{wxobject}
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\wxheading{Include files}
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<wx/variant.h>
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\wxheading{See also}
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\helpref{wxVariantData}{wxvariantdata}
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\latexignore{\rtfignore{\wxheading{Members}}}
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\membersection{wxVariant::wxVariant}\label{wxvariantctor}
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\func{}{wxVariant}{\void}
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Default constructor.
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\func{}{wxVariant}{\param{const wxVariant\& }{variant}}
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Copy constructor.
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\func{}{wxVariant}{\param{const char*}{ value}, \param{const wxString\& }{name = ``"}}
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\func{}{wxVariant}{\param{const wxString\&}{ value}, \param{const wxString\& }{name = ``"}}
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Construction from a string value.
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\func{}{wxVariant}{\param{char}{ value}, \param{const wxString\& }{name = ``"}}
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Construction from a character value.
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\func{}{wxVariant}{\param{long}{ value}, \param{const wxString\& }{name = ``"}}
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Construction from an integer value. You may need to cast to (long) to
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avoid confusion with other constructors (such as the bool constructor).
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\func{}{wxVariant}{\param{bool}{ value}, \param{const wxString\& }{name = ``"}}
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Construction from a boolean value.
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\func{}{wxVariant}{\param{double}{ value}, \param{const wxString\& }{name = ``"}}
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Construction from a double-precision floating point value.
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\func{}{wxVariant}{\param{const wxList\&}{ value}, \param{const wxString\& }{name = ``"}}
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Construction from a list of wxVariant objects. This constructor
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copies {\it value}, the application is still responsible for
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deleting {\it value} and its contents.
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\func{}{wxVariant}{\param{const wxStringList\&}{ value}, \param{const wxString\& }{name = ``"}}
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Construction from a list of strings. This constructor
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copies {\it value}, the application is still responsible for
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deleting {\it value} and its contents.
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%Note: this constructor is currently disabled because it causes a C++ ambiguity.
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\func{}{wxVariant}{\param{const wxTime\&}{ value}, \param{const wxString\& }{name = ``"}}
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Construction from a time.
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\func{}{wxVariant}{\param{const wxDate\&}{ value}, \param{const wxString\& }{name = ``"}}
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Construction from a date.
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\func{}{wxVariant}{\param{void*}{ value}, \param{const wxString\& }{name = ``"}}
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Construction from a void pointer.
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\func{}{wxVariant}{\param{wxVariantData*}{ data}, \param{const wxString\& }{name = ``"}}
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Construction from user-defined data. The variant holds on to the {\it data} pointer.
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\membersection{wxVariant::\destruct{wxVariant}}\label{wxvariantdtor}
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\func{}{\destruct{wxVariant}}{\void}
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Destructor.
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\membersection{wxVariant::Append}\label{wxvariantappend}
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\func{void}{Append}{\param{const wxVariant\&}{ value}}
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Appends a value to the list.
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\membersection{wxVariant::ClearList}\label{wxvariantclearlist}
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\func{void}{ClearList}{\void}
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Deletes the contents of the list.
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\membersection{wxVariant::GetCount}\label{wxvariantgetcount}
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\constfunc{int}{GetCount}{\void}
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Returns the number of elements in the list.
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\membersection{wxVariant::Delete}\label{wxvariantdelete}
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\func{bool}{Delete}{\param{int }{item}}
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Deletes the zero-based {\it item} from the list.
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\membersection{wxVariant::GetBool}\label{wxvariantgetbool}
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\constfunc{bool}{GetBool}{\void}
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Returns the boolean value.
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\membersection{wxVariant::GetChar}\label{wxvariantgetchar}
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\constfunc{char}{GetChar}{\void}
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Returns the character value.
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\membersection{wxVariant::GetData}\label{wxvariantgetdata}
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\constfunc{wxVariantData*}{GetData}{\void}
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Returns a pointer to the internal variant data.
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\membersection{wxVariant::GetDate}\label{wxvariantgetdate}
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\constfunc{wxDate}{GetDate}{\void}
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Gets the date value.
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\membersection{wxVariant::GetDouble}\label{wxvariantgetdouble}
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\constfunc{double}{GetDouble}{\void}
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Returns the floating point value.
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\membersection{wxVariant::GetLong}\label{wxvariantgetlong}
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\constfunc{long}{GetLong}{\void}
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Returns the integer value.
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\membersection{wxVariant::GetName}\label{wxvariantgetname}
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\constfunc{const wxString\&}{GetName}{\void}
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Returns a constant reference to the variant name.
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\membersection{wxVariant::GetString}\label{wxvariantgetstring}
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\constfunc{wxString}{GetString}{\void}
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Gets the string value.
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\membersection{wxVariant::GetTime}\label{wxvariantgettime}
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\constfunc{wxTime}{GetTime}{\void}
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Gets the time value.
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\membersection{wxVariant::GetType}\label{wxvariantgettype}
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\constfunc{wxString}{GetType}{\void}
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Returns the value type as a string. The built-in types are: bool, char, date, double, list, long, string, stringlist, time, void*.
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If the variant is null, the value type returned is the string ``null" (not the empty string).
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\membersection{wxVariant::GetVoidPtr}\label{wxvariantgetvoidptr}
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\constfunc{void*}{GetVoidPtr}{\void}
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Gets the void pointer value.
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\membersection{wxVariant::Insert}\label{wxvariantinsert}
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\func{void}{Insert}{\param{const wxVariant\&}{ value}}
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Inserts a value at the front of the list.
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\membersection{wxVariant::IsNull}\label{wxvariantisnull}
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\constfunc{bool}{IsNull}{\void}
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Returns TRUE if there is no data associated with this variant, FALSE if there is data.
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\membersection{wxVariant::IsType}\label{wxvariantistype}
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\constfunc{bool}{IsType}{\param{const wxString\&}{ type}}
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Returns TRUE if {\it type} matches the type of the variant, FALSE otherwise.
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\membersection{wxVariant::MakeNull}\label{wxvariantmakenull}
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\func{void}{MakeNull}{\void}
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Makes the variant null by deleting the internal data.
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\membersection{wxVariant::MakeString}\label{wxvariantmakestring}
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\constfunc{wxString}{MakeString}{\void}
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Makes a string representation of the variant value (for any type).
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\membersection{wxVariant::Member}\label{wxvariantmember}
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\constfunc{bool}{Member}{\param{const wxVariant\&}{ value}}
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Returns TRUE if {\it value} matches an element in the list.
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\membersection{wxVariant::NullList}\label{wxvariantnulllist}
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\func{void}{NullList}{\void}
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Makes an empty list. This differs from a null variant which has no data; a null list
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is of type list, but the number of elements in the list is zero.
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\membersection{wxVariant::SetData}\label{wxvariantsetdata}
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\func{void}{SetData}{\param{wxVariantData*}{ data}}
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Sets the internal variant data, deleting the existing data if there is any.
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\membersection{wxVariant::operator $=$}\label{wxvariantassignment}
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\func{void}{operator $=$}{\param{const wxVariant\& }{value}}
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\func{void}{operator $=$}{\param{wxVariantData* }{value}}
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\func{void}{operator $=$}{\param{const wxString\& }{value}}
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\func{void}{operator $=$}{\param{const char* }{value}}
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\func{void}{operator $=$}{\param{char }{value}}
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\func{void}{operator $=$}{\param{const long }{value}}
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\func{void}{operator $=$}{\param{const bool }{value}}
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\func{void}{operator $=$}{\param{const double }{value}}
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\func{void}{operator $=$}{\param{const wxDate\& }{value}}
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\func{void}{operator $=$}{\param{const wxTime\& }{value}}
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\func{void}{operator $=$}{\param{void* }{value}}
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\func{void}{operator $=$}{\param{const wxList\& }{value}}
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\func{void}{operator $=$}{\param{const wxStringList\& }{value}}
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Assignment operators.
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\membersection{wxVariant::operator $==$}\label{wxvarianteq}
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\func{bool}{operator $==$}{\param{const wxVariant\& }{value}}
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\func{bool}{operator $==$}{\param{const wxString\& }{value}}
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\func{bool}{operator $==$}{\param{const char* }{value}}
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\func{bool}{operator $==$}{\param{char }{value}}
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\func{bool}{operator $==$}{\param{const long }{value}}
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\func{bool}{operator $==$}{\param{const bool }{value}}
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\func{bool}{operator $==$}{\param{const double }{value}}
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\func{bool}{operator $==$}{\param{const wxDate\& }{value}}
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\func{bool}{operator $==$}{\param{const wxTime\& }{value}}
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\func{bool}{operator $==$}{\param{void* }{value}}
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\func{bool}{operator $==$}{\param{const wxList\& }{value}}
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\func{bool}{operator $==$}{\param{const wxStringList\& }{value}}
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Equality test operators.
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\membersection{wxVariant::operator $!=$}\label{wxvariantneq}
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\func{bool}{operator $!=$}{\param{const wxVariant\& }{value}}
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\func{bool}{operator $!=$}{\param{const wxString\& }{value}}
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\func{bool}{operator $!=$}{\param{const char* }{value}}
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\func{bool}{operator $!=$}{\param{char }{value}}
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\func{bool}{operator $!=$}{\param{const long }{value}}
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\func{bool}{operator $!=$}{\param{const bool }{value}}
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\func{bool}{operator $!=$}{\param{const double }{value}}
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\func{bool}{operator $!=$}{\param{const wxDate\& }{value}}
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\func{bool}{operator $!=$}{\param{const wxTime\& }{value}}
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\func{bool}{operator $!=$}{\param{void* }{value}}
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\func{bool}{operator $!=$}{\param{const wxList\& }{value}}
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\func{bool}{operator $!=$}{\param{const wxStringList\& }{value}}
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Inequality test operators.
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\membersection{wxVariant::operator $[]$}\label{wxvariantarray}
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\constfunc{wxVariant}{operator $[]$}{\param{size\_t }{idx}}
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Returns the value at {\it idx} (zero-based).
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\func{wxVariant\&}{operator $[]$}{\param{size\_t }{idx}}
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Returns a reference to the value at {\it idx} (zero-based). This can be used
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to change the value at this index.
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\membersection{wxVariant::operator char}\label{wxvariantchar}
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\constfunc{char}{operator char}{\void}
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Operator for implicit conversion to a char, using \helpref{wxVariant::GetChar}{wxvariantgetchar}.
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\membersection{wxVariant::operator double}\label{wxvariantdouble}
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\constfunc{double}{operator double}{\void}
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Operator for implicit conversion to a double, using \helpref{wxVariant::GetDouble}{wxvariantgetdouble}.
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\constfunc{long}{operator long}{\void}
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Operator for implicit conversion to a long, using \helpref{wxVariant::GetLong}{wxvariantgetlong}.
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\membersection{wxVariant::operator wxDate}\label{wxvariantwxdate}
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\constfunc{wxDate}{operator wxDate}{\void}
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Operator for implicit conversion to a wxDate, using \helpref{wxVariant::GetDate}{wxvariantgetdate}.
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\membersection{wxVariant::operator wxString}\label{wxvariantwxstring}
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\constfunc{wxString}{operator wxString}{\void}
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Operator for implicit conversion to a string, using \helpref{wxVariant::MakeString}{wxvariantmakestring}.
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\membersection{wxVariant::operator wxTime}\label{wxvariantwxtime}
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\constfunc{wxTime}{operator wxTime}{\void}
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Operator for implicit conversion to a wxTime, using \helpref{wxVariant::GetTime}{wxvariantgettime}.
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\membersection{wxVariant::operator void*}\label{wxvariantvoid}
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\constfunc{void*}{operator void*}{\void}
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Operator for implicit conversion to a pointer to a void, using \helpref{wxVariant::GetVoidPtr}{wxvariantgetvoidptr}.
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\section{\class{wxVariantData}}\label{wxvariantdata}
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The {\bf wxVariantData} is used to implement a new type for wxVariant. Derive from wxVariantData,
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and override the pure virtual functions.
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\wxheading{Derived from}
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\helpref{wxObject}{wxobject}
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\wxheading{Include files}
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<wx/variant.h>
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\wxheading{See also}
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\helpref{wxVariant}{wxvariant}
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\latexignore{\rtfignore{\wxheading{Members}}}
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\membersection{wxVariantData::wxVariantData}\label{wxvariantdatactor}
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\func{}{wxVariantData}{\void}
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Default constructor.
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\membersection{wxVariantData::Copy}\label{wxvariantdatacopy}
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\func{void}{Copy}{\param{wxVariantData\&}{ data}}
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Copy the data from `this' object to {\it data}.
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\membersection{wxVariantData::Eq}\label{wxvariantdataeq}
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\constfunc{bool}{Eq}{\param{wxVariantData\&}{ data}}
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Returns TRUE if this object is equal to {\it data}.
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\membersection{wxVariantData::GetType}\label{wxvariantdatagettype}
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\constfunc{wxString}{GetType}{\void}
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Returns the string type of the data.
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\membersection{wxVariantData::Read}\label{wxvariantdataread}
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\func{bool}{Read}{\param{ostream\&}{ stream}}
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\func{bool}{Read}{\param{wxString\&}{ string}}
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Reads the data from {\it stream} or {\it string}.
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\membersection{wxVariantData::Write}\label{wxvariantdatawrite}
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\constfunc{bool}{Write}{\param{ostream\&}{ stream}}
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\constfunc{bool}{Write}{\param{wxString\&}{ string}}
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Writes the data to {\it stream} or {\it string}.
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