| 1 | \section{\class{wxClientData}}\label{wxclientdata} |
| 2 | |
| 3 | All classes deriving from \helpref{wxEvtHandler}{wxevthandler} |
| 4 | (such as all controls and \helpref{wxApp}{wxapp}) |
| 5 | can hold arbitrary data which is here referred to as "client data". |
| 6 | This is useful e.g. for scripting languages which need to handle |
| 7 | shadow objects for most of wxWidgets' classes and which store |
| 8 | a handle to such a shadow class as client data in that class. |
| 9 | This data can either be of type void - in which case the data |
| 10 | {\it container} does not take care of freeing the data again |
| 11 | or it is of type wxClientData or its derivatives. In that case the |
| 12 | container (e.g. a control) will free the memory itself later. |
| 13 | Note that you {\it must not} assign both void data and data |
| 14 | derived from the wxClientData class to a container. |
| 15 | |
| 16 | Some controls can hold various items and these controls can |
| 17 | additionally hold client data for each item. This is the case for |
| 18 | \helpref{wxChoice}{wxchoice}, \helpref{wxComboBox}{wxcombobox} |
| 19 | and \helpref{wxListBox}{wxlistbox}. \helpref{wxTreeCtrl}{wxtreectrl} |
| 20 | has a specialized class \helpref{wxTreeItemData}{wxtreeitemdata} |
| 21 | for each item in the tree. |
| 22 | |
| 23 | If you want to add client data to your own classes, you may |
| 24 | use the mix-in class \helpref{wxClientDataContainer}{wxclientdatacontainer}. |
| 25 | |
| 26 | \wxheading{Include files} |
| 27 | |
| 28 | <wx/clntdata.h> |
| 29 | |
| 30 | \wxheading{See also} |
| 31 | |
| 32 | \helpref{wxEvtHandler}{wxevthandler}, \helpref{wxTreeItemData}{wxtreeitemdata}, |
| 33 | \helpref{wxStringClientData}{wxstringclientdata}, \helpref{wxClientDataContainer}{wxclientdatacontainer} |
| 34 | |
| 35 | \latexignore{\rtfignore{\wxheading{Members}}} |
| 36 | |
| 37 | |
| 38 | \membersection{wxClientData::wxClientData}\label{wxclientdatawxclientdata} |
| 39 | |
| 40 | \func{}{wxClientData}{\void} |
| 41 | |
| 42 | Constructor. |
| 43 | |
| 44 | \membersection{wxClientData::\destruct{wxClientData}}\label{wxclientdatadtor} |
| 45 | |
| 46 | \func{}{\destruct{wxClientData}}{\void} |
| 47 | |
| 48 | Virtual destructor. |
| 49 | |
| 50 | \section{\class{wxClientDataContainer}}\label{wxclientdatacontainer} |
| 51 | |
| 52 | This class is a mixin that provides storage and management of "client |
| 53 | data." This data can either be of type void - in which case the data |
| 54 | {\it container} does not take care of freeing the data again |
| 55 | or it is of type wxClientData or its derivatives. In that case the |
| 56 | container will free the memory itself later. |
| 57 | Note that you {\it must not} assign both void data and data |
| 58 | derived from the wxClientData class to a container. |
| 59 | |
| 60 | NOTE: This functionality is currently duplicated in wxEvtHandler in |
| 61 | order to avoid having more than one vtable in that class hierarchy. |
| 62 | |
| 63 | \wxheading{See also} |
| 64 | |
| 65 | \helpref{wxEvtHandler}{wxevthandler}, \helpref{wxClientData}{wxclientdata} |
| 66 | |
| 67 | \wxheading{Derived from} |
| 68 | |
| 69 | No base class |
| 70 | |
| 71 | \wxheading{Include files} |
| 72 | |
| 73 | <clntdata.h> |
| 74 | |
| 75 | \wxheading{Data structures} |
| 76 | |
| 77 | \latexignore{\rtfignore{\wxheading{Members}}} |
| 78 | |
| 79 | |
| 80 | \membersection{wxClientDataContainer::wxClientDataContainer}\label{wxclientdatacontainerwxclientdatacontainer} |
| 81 | |
| 82 | \func{}{wxClientDataContainer}{\void} |
| 83 | |
| 84 | |
| 85 | \membersection{wxClientDataContainer::\destruct{wxClientDataContainer}}\label{wxclientdatacontainerdtor} |
| 86 | |
| 87 | \func{}{\destruct{wxClientDataContainer}}{\void} |
| 88 | |
| 89 | |
| 90 | \membersection{wxClientDataContainer::GetClientData}\label{wxclientdatacontainergetclientdata} |
| 91 | |
| 92 | \constfunc{void*}{GetClientData}{\void} |
| 93 | |
| 94 | Get the untyped client data. |
| 95 | |
| 96 | \membersection{wxClientDataContainer::GetClientObject}\label{wxclientdatacontainergetclientobject} |
| 97 | |
| 98 | \constfunc{wxClientData*}{GetClientObject}{\void} |
| 99 | |
| 100 | Get a pointer to the client data object. |
| 101 | |
| 102 | \membersection{wxClientDataContainer::SetClientData}\label{wxclientdatacontainersetclientdata} |
| 103 | |
| 104 | \func{void}{SetClientData}{\param{void* }{data}} |
| 105 | |
| 106 | Set the untyped client data. |
| 107 | |
| 108 | \membersection{wxClientDataContainer::SetClientObject}\label{wxclientdatacontainersetclientobject} |
| 109 | |
| 110 | \func{void}{SetClientObject}{\param{wxClientData* }{data}} |
| 111 | |
| 112 | Set the client data object. Any previous object will be deleted. |
| 113 | |