wxDataViewModel is the base class for all data model to be
displayed by a \helpref{wxDataViewCtrl}{wxdataviewctrl}.
-Currently, this class has no functionality at all and the
-only existing implementation of it is the
-\helpref{wxDataViewListModel}{wxdataviewlistmodel}. The
-plan is to move all functionality of wxDataViewListModel
-and a to-be-written wxDataViewTreeModel into wxDataViewModel
-and make wxDataViewListModel and wxDataViewTreeModel subsets
-of the abstract wxDataViewModel.
+All other models derive from it and must implement its
+pure virtual functions in order to define a complete
+data model. In detail, you need to override
+\helpref{IsContainer}{wxdataviewmodeliscontainer},
+\helpref{GetParent}{wxdataviewmodelgetparent},
+\helpref{GetChildren}{wxdataviewmodelgetchildren},
+\helpref{GetColumnCount}{wxdataviewmodelgetcolumncount},
+\helpref{GetColumnType}{wxdataviewmodelgetcolumntype} and
+\helpref{GetValue}{wxdataviewmodelgetvalue} in order to
+define the data model which acts as an interface between
+your actual data and the wxDataViewCtrl. Since you will
+usually also allow the wxDataViewCtrl to change your data
+through its graphical interface, you will also have to override
+\helpref{SetValue}{wxdataviewmodelsetvalue} which the
+wxDataViewCtrl will call when a change to some data has been
+commited.
+
+wxDataViewModel (as indeed the entire wxDataViewCtrl
+code) is using \helpref{wxVariant}{wxvariant} to store data and
+its type in a generic way. wxVariant can be extended to contain
+almost any data without changes to the original class.
+
+The data that is presented through this data model is expected
+to change at run-time. You need to inform the data model when
+a change happened. Depending on what happened you need to call
+one of the following methods:
+\helpref{ValueChanged}{wxdataviewmodelvaluechanged},
+\helpref{ItemAdded}{wxdataviewmodelitemadded},
+\helpref{ItemDeleted}{wxdataviewmodelitemdeleted},
+\helpref{ItemChanged}{wxdataviewmodelitemchanged},
+\helpref{Cleared}{wxdataviewmodelcleared}. There are
+plural forms for notification of addition, change
+or removal of several item at once. See
+\helpref{ItemsAdded}{wxdataviewmodelitemsadded},
+\helpref{ItemsDeleted}{wxdataviewmodelitemsdeleted},
+\helpref{ItemsChanged}{wxdataviewmodelitemschanged}.
+
+Note that wxDataViewModel does not define the position or
+index of any item in the control because different controls
+might display the same data differently. wxDataViewModel does
+provide a \helpref{Compare}{wxdataviewmodelcompare} method
+which the wxDataViewCtrl may use to sort the data either
+in conjunction with a column header or without (see
+\helpref{HasDefaultCompare}{wxdataviewmodelhasdefaultcompare}).
+
+This class maintains a list of
+\helpref{wxDataViewModelNotifier}{wxdataviewmodelnotifier}
+which link this class to the specific implementations on the
+supported platforms so that e.g. calling
+\helpref{ValueChanged}{wxdataviewmodelvaluechanged}
+on this model will just call
+\helpref{wxDataViewModelNotifier::ValueChanged}{wxdataviewmodelnotifiervaluechanged}
+for each notifier that has been added. You can also add
+your own notifier in order to get informed about any changes
+to the data in the list model.
+
+Currently wxWidgets provides the following models apart
+from the base model:
+\helpref{wxDataViewIndexListModel}{wxdataviewindexlistmodel},
+\helpref{wxDataViewTreeStore}{wxdataviewtreestore}.
+
+Note that wxDataViewModel is reference counted, derives from
+\helpref{wxObjectRefData}{wxobjectrefdata} and cannot be deleted
+directly as it can be shared by several wxDataViewCtrls. This
+implies that you need to decrease the reference count after
+associating the model with a control like this:
+
+{\small%
+\begin{verbatim}
+ wxDataViewCtrl *musicCtrl = new wxDataViewCtrl( this, ID_MUSIC_CTRL );
+ wxDataViewModel *musicModel = new MyMusicModel;
+ m_musicCtrl->AssociateModel( musicModel );
+ musicModel->DecRef(); // avoid memory leak !!
+ // add columns now
+\end{verbatim}
+}%
\wxheading{Derived from}
-\helpref{wxObject}{wxobject}
+\helpref{wxObjectRefData}{wxobjectrefdata}
\wxheading{Include files}
<wx/dataview.h>
+\wxheading{Library}
+
+\helpref{wxAdv}{librarieslist}
+
+
+
+\latexignore{\rtfignore{\wxheading{Members}}}
+
+
\membersection{wxDataViewModel::wxDataViewModel}\label{wxdataviewmodelwxdataviewmodel}
\func{}{wxDataViewModel}{\void}
Constructor.
+
\membersection{wxDataViewModel::\destruct{wxDataViewModel}}\label{wxdataviewmodeldtor}
\func{}{\destruct{wxDataViewModel}}{\void}
-Destructor.
-
-\section{\class{wxDataViewListModel}}\label{wxdataviewlistmodel}
+Destructor. This should not be called directly. Use DecRef() instead.
-wxDataViewListModel is currently the only existing variant
-of a \helpref{wxDataViewModel}{wxdataviewmodel}. It allows
-to define a table like data model to be displayed by a
-\helpref{wxDataViewCtrl}{wxdataviewctrl}. You need to derive
-from this class to define your own data model.
-This class maintains a list of
-\helpref{wxDataListViewListModelNotifier}{wxdataviewlistmodelnotifier}
-which link this class to the specific implementations on the
-supported platforms so that e.g. calling {\it ValueChanged()}
-on this model will just call
-\helpref{wxDataListViewListModelNotifier::ValueChanged}{wxdataviewlistmodelnotifiervaluechanged}
-for each notifier that has been added. This is used both for
-informing the native controls to redraw themselves and for informing
-e.g. the \helpref{wxDataViewSortedListModel}{wxdataviewsortedlistmodel}
-to resort itself. You can also add your own notifier in order
-to get informed about any changes to the data in the list model.
-
-Additionally, this class maintains a list of all
-\helpref{wxDataViewColumns}{wxdataviewcolumn} which
-display a certain column of this list model. This is
-mostly used internally.
-\wxheading{Derived from}
+\membersection{wxDataViewModel::AddNotifier}\label{wxdataviewmodeladdnotifier}
-\helpref{wxDataViewModel}{wxdataviewmodel}
+\func{void}{AddNotifier}{\param{wxDataViewModelNotifier* }{notifier}}
-\wxheading{Include files}
+Adds a \helpref{wxDataViewModelNotifier}{wxdataviewmodelnotifier}
+to the model.
-<wx/dataview.h>
+\membersection{wxDataViewModel::Cleared}\label{wxdataviewmodelcleared}
-\membersection{wxDataViewListModel::wxDataViewListModel}\label{wxdataviewlistmodelwxdataviewlistmodel}
+\func{virtual bool}{Cleared}{\void}
-\func{}{wxDataViewListModel}{\void}
+Called to inform the model that all data has been cleared. The
+control will reread the data from the model again.
-Constructor.
-\membersection{wxDataViewListModel::\destruct{wxDataViewListModel}}\label{wxdataviewlistmodeldtor}
+\membersection{wxDataViewModel::Compare}\label{wxdataviewmodelcompare}
-\func{}{\destruct{wxDataViewListModel}}{\void}
+\func{virtual int}{Compare}{\param{const wxDataViewItem\& }{item1}, \param{const wxDataViewItem\& }{item2}, \param{unsigned int }{column}, \param{bool }{ascending}}
-Destructor.
+The compare function to be used by control. The default compare function
+sorts by container and other items separately and in ascending order.
+Override this for a different sorting behaviour.
-\membersection{wxDataViewListModel::AddNotifier}\label{wxdataviewlistmodeladdnotifier}
+See also \helpref{HasDefaultCompare}{wxdataviewmodelhasdefaultcompare}.
-\func{void}{AddNotifier}{\param{wxDataViewListModelNotifier* }{notifier}}
-Adds {\it notifier} to the internal list of notifers.
+\membersection{wxDataViewModel::GetAttr}\label{wxdataviewmodelgetattr}
-See also \helpref{RemoveNotifier}{wxdataviewlistmodelremovenotifier}.
+\func{bool}{GetAttr}{\param{const wxDataViewItem\& }{item}, \param{unsigned int }{col}, \param{wxDataViewItemAttr\& }{attr}}
-\membersection{wxDataViewListModel::AddViewingColumn}\label{wxdataviewlistmodeladdviewingcolumn}
+Oberride this to indicate that the item has special font attributes.
+This only affects the
+\helpref{wxDataViewTextRendererText}{wxdataviewtextrendererattr} renderer.
-\func{void}{AddViewingColumn}{\param{wxDataViewColumn* }{view\_column}, \param{unsigned int }{model\_column}}
+See also \helpref{wxDataViewItemAttr}{wxdataviewitemattr}.
-Used internally. Used for maintaining a list of
-\helpref{wxDataViewColumn}{wxdataviewcolumn} that
-display a certain column of this model.
+\membersection{wxDataViewModel::GetColumnCount}\label{wxdataviewmodelgetcolumncount}
-\membersection{wxDataViewListModel::Cleared}\label{wxdataviewlistmodelcleared}
+\constfunc{virtual unsigned int}{GetColumnCount}{\void}
-\func{bool}{virtual Cleared}{\void}
+Override this to indicate the number of columns in the model.
-Call this if all data in your model has been cleared.
-\membersection{wxDataViewListModel::GetColType}\label{wxdataviewlistmodelgetcoltype}
+\membersection{wxDataViewModel::GetColumnType}\label{wxdataviewmodelgetcolumntype}
-\func{virtual wxString}{GetColType}{\param{unsigned int }{col}}
+\constfunc{virtual wxString}{GetColumnType}{\param{unsigned int }{col}}
Override this to indicate what type of data is stored in the
column specified by {\it col}. This should return a string
indicating the type of data as reported by \helpref{wxVariant}{wxvariant}.
-\membersection{wxDataViewListModel::GetNumberOfCols}\label{wxdataviewlistmodelgetnumberofcols}
-\func{virtual unsigned int}{GetNumberOfCols}{\void}
+\membersection{wxDataViewModel::GetChildren}\label{wxdataviewmodelgetchildren}
-Override this to indicate, how many columns the list
-model has.
+\constfunc{virtual unsigned int}{GetChildren}{\param{const wxDataViewItem\& }{item}, \param{wxDataViewItemArray\& }{children} }
-\membersection{wxDataViewListModel::GetNumberOfRows}\label{wxdataviewlistmodelgetnumberofrows}
+Override this so the control can query the child items of
+an item. Returns the number of items.
-\func{virtual unsigned int}{GetNumberOfRows}{\void}
-Override this to indicate, how many rows the list
-model has.
+\membersection{wxDataViewModel::GetParent}\label{wxdataviewmodelgetparent}
-\membersection{wxDataViewListModel::GetValue}\label{wxdataviewlistmodelgetvalue}
+\constfunc{virtual wxDataViewItem}{GetParent}{\param{const wxDataViewItem\& }{item}}
-\func{virtual void}{GetValue}{\param{wxVariant\& }{variant}, \param{unsigned int }{col}, \param{unsigned int }{row}}
+Override this to indicate which wxDataViewItem representing the parent
+of {\it item} or an invalid wxDataViewItem if the the root item is
+the parent item.
-Override this to indicate the value of a given value
-in the list model. A \helpref{wxVariant}{wxvariant}
-is used to store the data.
-\membersection{wxDataViewListModel::RemoveNotifier}\label{wxdataviewlistmodelremovenotifier}
+\membersection{wxDataViewModel::GetValue}\label{wxdataviewmodelgetvalue}
-\func{void}{RemoveNotifier}{\param{wxDataViewListModelNotifier* }{notifier}}
+\constfunc{virtual void}{GetValue}{\param{wxVariant\& }{variant}, \param{const wxDataViewItem\& }{item}, \param{unsigned int }{col}}
-Removes the notifier from the list of notifiers.
+Override this to indicate the value of {\it item}
+A \helpref{wxVariant}{wxvariant} is used to store the data.
-See also \helpref{AddNotifier}{wxdataviewlistmodeladdnotifier}.
-\membersection{wxDataViewListModel::RemoveViewingColumn}\label{wxdataviewlistmodelremoveviewingcolumn}
-\func{void}{RemoveViewingColumn}{\param{wxDataViewColumn* }{column}}
+\membersection{wxDataViewModel::HasContainerColumns}\label{wxdataviewmodelhascontainercolumns}
-Used internally. Used for maintaining a list of
-\helpref{wxDataViewColumn}{wxdataviewcolumn} that
-display a certain column of this model.
+\constfunc{virtual bool}{HasContainerColumns}{\param{const wxDataViewItem\& }{item}}
-\membersection{wxDataViewListModel::RowAppended}\label{wxdataviewlistmodelrowappended}
+Override this method to indicate if a container item merely
+acts as a headline (or for categorisation) or if it also
+acts a normal item with entries for futher columns. By
+default returns {\it false}.
-\func{virtual bool}{RowAppended}{\void}
-Call this if a row has been appended to the list model.
+\membersection{wxDataViewModel::HasDefaultCompare}\label{wxdataviewmodelhasdefaultcompare}
-\membersection{wxDataViewListModel::RowChanged}\label{wxdataviewlistmodelrowchanged}
+\constfunc{virtual bool}{HasDefaultCompare}{\void}
-\func{virtual bool}{RowChanged}{\param{unsigned int }{row}}
+Override this to indicate that the model provides a default compare
+function that the control should use if no wxDataViewColumn has been
+chosen for sorting. Usually, the user clicks on a column header for
+sorting, the data will be sorted alphanumerically. If any other
+order (e.g. by index or order of appearance) is required, then this
+should be used. See also \helpref{wxDataViewIndexListModel}{wxdataviewindexlistmodel}
+for a model which makes use of this.
-Call this if the values of this row have been changed.
-\membersection{wxDataViewListModel::RowDeleted}\label{wxdataviewlistmodelrowdeleted}
+\membersection{wxDataViewModel::IsContainer}\label{wxdataviewmodeliscontainer}
-\func{virtual bool}{RowDeleted}{\param{unsigned int }{row}}
+\constfunc{virtual bool}{IsContainer}{\param{const wxDataViewItem\& }{item}}
-Call this if this row has been deleted.
+Override this to indicate of {\it item} is a container, i.e. if
+it can have child items.
-\membersection{wxDataViewListModel::RowInserted}\label{wxdataviewlistmodelrowinserted}
-\func{virtual bool}{RowInserted}{\param{unsigned int }{before}}
+\membersection{wxDataViewModel::ItemAdded}\label{wxdataviewmodelitemadded}
-Call this if a row has been inserted.
+\func{virtual bool}{ItemAdded}{\param{const wxDataViewItem\& }{parent}, \param{const wxDataViewItem\& }{item}}
-\membersection{wxDataViewListModel::RowPrepended}\label{wxdataviewlistmodelrowprepended}
+Call this to inform the model that an item has been added
+to the data.
-\func{virtual bool}{RowPrepended}{\void}
-Call this if a row has been prepended.
+\membersection{wxDataViewModel::ItemChanged}\label{wxdataviewmodelitemchanged}
-\membersection{wxDataViewListModel::RowsReordered}\label{wxdataviewlistmodelrowsreordered}
+\func{virtual bool}{ItemChanged}{\param{const wxDataViewItem\& }{item}}
-\func{virtual bool}{RowsReordered}{\param{unsigned int* }{new\_order}}
+Call this to inform the model that an item has changed.
-Call this if the rows have been reorderd.
+This will eventually emit a wxEVT\_DATAVIEW\_ITEM\_VALUE\_CHANGED
+event (in which the column fields will not be set) to the user.
-\membersection{wxDataViewListModel::SetValue}\label{wxdataviewlistmodelsetvalue}
-\func{virtual bool}{SetValue}{\param{wxVariant\& }{variant}, \param{unsigned int }{col}, \param{unsigned int }{row}}
+\membersection{wxDataViewModel::ItemDeleted}\label{wxdataviewmodelitemdeleted}
-This method gets called by e.g. the wxDataViewCtrl class if a
-value has been changed through its graphical interface. You
-need to override this method in order to update the data in
-the underlying data structur. Afterwards,
-\helpref{ValueChanged}{wxdataviewlistmodelvaluechanged} is called.
+\func{virtual bool}{ItemDeleted}{\param{const wxDataViewItem\& }{parent}, \param{const wxDataViewItem\& }{item}}
+Call this to inform the model that an item has been deleted from the data.
-\membersection{wxDataViewListModel::ValueChanged}\label{wxdataviewlistmodelvaluechanged}
-\func{virtual bool}{ValueChanged}{\param{unsigned int }{col}, \param{unsigned int }{row}}
+\membersection{wxDataViewModel::ItemsAdded}\label{wxdataviewmodelitemsadded}
-Call this if a value in the model has been changed.
+\func{virtual bool}{ItemsAdded}{\param{const wxDataViewItem\& }{parent}, \param{const wxDataViewItemArray\& }{items}}
+Call this to inform the model that several items have been added
+to the data.
-\section{\class{wxDataViewSortedListModel}}\label{wxdataviewsortedlistmodel}
-This class is used for sorting data. It does not contain any
-data itself. Rather, it provides a sorted interface for
-another list model.
+\membersection{wxDataViewModel::ItemsChanged}\label{wxdataviewmodelitemschanged}
-Currently, the sorting algorithm isn't thread safe. This needs
-to be fixed.
+\func{virtual bool}{ItemsChanged}{\param{const wxDataViewItemArray\& }{items}}
-\wxheading{Derived from}
+Call this to inform the model that several items have changed.
-\helpref{wxDataViewListModel}{wxdataviewlistmodel}
+This will eventually emit wxEVT\_DATAVIEW\_ITEM\_VALUE\_CHANGED
+events (in which the column fields will not be set) to the user.
-\wxheading{Include files}
-<wx/dataview.h>
+\membersection{wxDataViewModel::ItemsDeleted}\label{wxdataviewmodelitemsdeleted}
+
+\func{virtual bool}{ItemsDeleted}{\param{const wxDataViewItem\& }{parent}, \param{const wxDataViewItemArray\& }{items}}
+
+Call this to inform the model that several items have been deleted.
+
+
+\membersection{wxDataViewModel::RemoveNotifier}\label{wxdataviewmodelremovenotifier}
-\membersection{wxDataViewSortedListModel::wxDataViewSortedListModel}\label{wxdataviewsortedlistmodelwxdataviewsortedlistmodel}
+\func{void}{RemoveNotifier}{\param{wxDataViewModelNotifier* }{notifier}}
-\func{}{wxDataViewSortedListModel}{\param{wxDataViewListModel* }{child}}
+Remove the {\it notifier} from the list of notifiers.
-Constructor. {\it child} is the child data model the data of
-which this model is supposed to present in a sorted way.
-\membersection{wxDataViewSortedListModel::\destruct{wxDataViewSortedListModel}}\label{wxdataviewsortedlistmodeldtor}
+\membersection{wxDataViewModel::Resort}\label{wxdataviewmodelresort}
-\func{}{\destruct{wxDataViewSortedListModel}}{\void}
+\func{virtual void}{Resort}{\void}
-Destructor.
+Call this to initiate a resort after the sort function has
+been changed.
-\membersection{wxDataViewSortedListModel::GetAscending}\label{wxdataviewsortedlistmodelgetascending}
-\func{bool}{GetAscending}{\void}
+\membersection{wxDataViewModel::SetValue}\label{wxdataviewmodelsetvalue}
-Returns true if the data is sorted in ascending order.
+\func{virtual bool}{SetValue}{\param{const wxVariant\& }{variant}, \param{const wxDataViewItem\& }{item}, \param{unsigned int }{col}}
-\membersection{wxDataViewSortedListModel::Resort}\label{wxdataviewsortedlistmodelresort}
+This gets called in order to set a value in the data model.
+The most common scenario is that the wxDataViewCtrl calls
+this method after the user changed some data in the view.
+Afterwards \helpref{ValueChanged}{wxdataviewmodelvaluechanged}
+has to be called!
-\func{void}{Resort}{\void}
-Tell the model to resort its data.
+\membersection{wxDataViewModel::ValueChanged}\label{wxdataviewmodelvaluechanged}
-\membersection{wxDataViewSortedListModel::SetAscending}\label{wxdataviewsortedlistmodelsetascending}
+\func{virtual bool}{ValueChanged}{\param{const wxDataViewItem\& }{item}, \param{unsigned int }{col}}
-\func{void}{SetAscending}{\param{bool }{ascending}}
+Call this to inform this model that a value in the model has
+been changed. This is also called from wxDataViewCtrl's
+internal editing code, e.g. when editing a text field
+in the control.
-Set the sort order of the data.
+This will eventually emit a wxEVT\_DATAVIEW\_ITEM\_VALUE\_CHANGED
+event to the user.
projects / wxWidgets.git / blobdiff