wxHeaderCtrl is the control containing the column headings which is usually
used for display of tabular data.
- It is used as part of wxGrid and (will be used in the near future) in
- in wxDataViewCtrl and report view of wxListCtrl but can be also used
- independently.
+ It is used as part of wxGrid, in generic version wxDataViewCtrl and report
+ view of wxListCtrl but can be also used independently. In general this
+ class is meant to be used as part of another control which already stores
+ the column information somewhere as it can't be used directly: instead you
+ need to inherit from it and implement the GetColumn() method to provide
+ column information. See wxHeaderCtrlSimple for a concrete control class
+ which can be used directly.
In addition to labeling the columns, the control has the following
features:
Notice that this control itself doesn't do anything other than displaying
the column headers. In particular column reordering and sorting must still
be supported by the associated control displaying the real data under the
- header.
+ header. Also remember to call ScrollWindow() method of the control if the
+ associated data display window has a horizontal scrollbar, otherwise the
+ headers wouldn't align with the data when the window is scrolled.
This control is implemented using the native header control under MSW
systems and a generic implementation elsewhere.
+
+ @section headerctrl_improvements Future Improvements
+
+ Some features are supported by the native MSW control and so could be
+ easily implemented in this version of wxHeaderCtrl but need to be
+ implemented in the generic version as well to be really useful. Please let
+ us know if you need or, better, plan to work on implementing, any of them:
+ - Displaying bitmaps instead of or together with the text
+ - Custom drawn headers
+ - Filters associated with a column.
+
+
@beginStyleTable
- @style{wxHD_DRAGDROP}
- If this style is specified (it is by default), the user can reorder
- the control columns by dragging them.
- @style{wxHD_DEFAULT_STYLE}
- Symbolic name for the default control style, currently equal to @c
- wxHD_DRAGDROP.
+ @style{wxHD_ALLOW_REORDER}
+ If this style is specified (it is by default), the user can reorder
+ the control columns by dragging them.
+ @style{wxHD_ALLOW_HIDE}
+ If this style is specified, the control shows a popup menu allowing the
+ user to change the columns visibility on right mouse click. Notice that
+ the program can always hide or show the columns, this style only
+ affects the users capability to do it.
+ @style{wxHD_DEFAULT_STYLE}
+ Symbolic name for the default control style, currently equal to
+ @c wxHD_ALLOW_REORDER.
@endStyleTable
- @beginEventTable{wxHeaderEvent}
+ @beginEventTable{wxHeaderCtrlEvent}
@event{EVT_HEADER_CLICK(id, func)}
A column heading was clicked.
+ @event{EVT_HEADER_RIGHT_CLICK(id, func)}
+ A column heading was right clicked.
+ @event{EVT_HEADER_MIDDLE_CLICK(id, func)}
+ A column heading was clicked with the middle mouse button.
+ @event{EVT_HEADER_DCLICK(id, func)}
+ A column heading was double clicked.
+ @event{EVT_HEADER_RIGHT_DCLICK(id, func)}
+ A column heading was right double clicked.
+ @event{EVT_HEADER_MIDDLE_DCLICK(id, func)}
+ A column heading was double clicked with the middle mouse button.
+ @event{EVT_HEADER_SEPARATOR_DCLICK(id, func)}
+ Separator to the right of the specified column was double clicked
+ (this action is commonly used to resize the column to fit its
+ contents width and the control provides UpdateColumnWidthToFit() method
+ to make implementing this easier).
+ @event{EVT_HEADER_BEGIN_RESIZE(id, func)}
+ The user started to drag the separator to the right of the column
+ with the specified index (this can only happen for the columns for
+ which wxHeaderColumn::IsResizeable() returns true). The event can
+ be vetoed to prevent the column from being resized. If it isn't,
+ the resizing and end resize (or dragging cancelled) events will be
+ generated later.
+ @event{EVT_HEADER_RESIZING(id, func)}
+ The user is dragging the column with the specified index resizing
+ it and its current width is wxHeaderCtrlEvent::GetWidth().
+ The event can be vetoed to stop the dragging operation completely at
+ any time.
+ @event{EVT_HEADER_END_RESIZE(id, func)}
+ The user stopped dragging the column by releasing the mouse.
+ The column should normally be resized to the value of
+ wxHeaderCtrlEvent::GetWidth().
+ @event{EVT_HEADER_BEGIN_REORDER(id, func)}
+ The user started to drag the column with the specified index (this
+ can only happen for the controls with wxHD_ALLOW_REORDER style).
+ This event can be vetoed to prevent the column from being reordered,
+ otherwise the end reorder message will be generated later.
+ @event{EVT_HEADER_END_REORDER(id, func)}
+ The user dropped the column in its new location. The event can be
+ vetoed to prevent the column from being placed at the new position
+ or handled to update the display of the data in the associated
+ control to match the new column location (available from
+ wxHeaderCtrlEvent::GetNewOrder()).
+ @event{EVT_HEADER_DRAGGING_CANCELLED(id, func)}
+ The resizing or reordering operation currently in progress was
+ cancelled. This can happen if the user pressed Esc key while
+ dragging the mouse or the mouse capture was lost for some other
+ reason. You only need to handle this event if your application
+ entered into some modal mode when resizing or reordering began, in
+ which case it should handle this event in addition to the matching
+ end resizing or reordering ones.
@endEventTable
@library{wxcore}
@category{ctrl}
@see wxGrid, wxListCtrl, wxDataViewCtrl
-
-
- @section headerctrl_improvements Future Improvements
-
- Some features are supported by the native MSW control and so could be
- easily implemented in this version of wxHeaderCtrl but need to be
- implemented in the generic version as well to be really useful. Please let
- us know if you need or, better, plan to work on implementing, any of them:
- - Displaying bitmaps instead of or together with the text
- - Custom drawn headers
- - Filters associated with a column.
*/
class wxHeaderCtrl
{
wxWindowID winid = wxID_ANY,
const wxPoint& pos = wxDefaultPosition,
const wxSize& size = wxDefaultSize,
- long style = 0,
+ long style = wxHD_DEFAULT_STYLE,
const wxString& name = wxHeaderCtrlNameStr);
/**
The control style, @c wxHD_DEFAULT_STYLE by default. Notice that
the default style allows the user to reorder the columns by
dragging them and you need to explicitly turn this feature off by
- using @code wxHD_DEFAULT_STYLE & ~wxHD_DRAGDROP @endcode if this is
- undesirable.
+ using @code wxHD_DEFAULT_STYLE & ~wxHD_ALLOW_REORDER @endcode if
+ this is undesirable.
@param name
The name of the control.
*/
wxWindowID winid = wxID_ANY,
const wxPoint& pos = wxDefaultPosition,
const wxSize& size = wxDefaultSize,
- long style = 0,
+ long style = wxHD_DEFAULT_STYLE,
const wxString& name = wxHeaderCtrlNameStr);
+ /**
+ Set the number of columns in the control.
+
+ The control will use GetColumn() to get information about all the
+ new columns and refresh itself, i.e. this method also has the same
+ effect as calling UpdateColumn() for all columns but it should only be
+ used if the number of columns really changed.
+ */
+ void SetColumnCount(unsigned int count);
+
/**
Return the number of columns in the control.
+ @return
+ Number of columns as previously set by SetColumnCount().
+
@see IsEmpty()
*/
unsigned int GetColumnCount() const;
*/
bool IsEmpty() const;
+ /**
+ Update the column with the given index.
+
+ When the value returned by GetColumn() changes, this method must be
+ called to notify the control about the change and update the visual
+ display to match the new column data.
+
+ @param idx
+ The column index, must be less than GetColumnCount().
+ */
+ void UpdateColumn(unsigned int idx);
+
+ /**
+ Change the columns display order.
+
+ The display order defines the order in which the columns appear on the
+ screen and does @em not affect the interpretation of indices by all the
+ other class methods.
+
+ The @a order array specifies the column indices corresponding to the
+ display positions.
+
+ @param order
+ A permutation of all column indices, i.e. an array of size
+ GetColumnsOrder() containing all column indices exactly once. The
+ n-th element of this array defines the index of the column shown at
+ the n-th position from left (for the default left-to-right writing
+ direction).
+
+ @see wxListCtrl::SetColumnsOrder()
+ */
+ void SetColumnsOrder(const wxArrayInt& order);
+
+ /**
+ Return the array describing the columns display order.
+
+ For the controls without wxHD_ALLOW_REORDER style the returned array
+ will be the same as was passed to SetColumnsOrder() previously or
+ define the default order (with n-th element being n) if it hadn't been
+ called. But for the controls with wxHD_ALLOW_REORDER style, the columns
+ can be also reordered by user.
+ */
+ wxArrayInt GetColumnsOrder() const;
+
+ /**
+ Return the index of the column displayed at the given position.
+
+ @param pos
+ The display position, e.g. 0 for the left-most column, 1 for the
+ next one and so on until GetColumnCount() - 1.
+
+ @see GetColumnPos()
+ */
+ unsigned int GetColumnAt(unsigned int pos) const;
+
+ /**
+ Get the position at which this column is currently displayed.
+
+ Notice that a valid position is returned even for the hidden columns
+ currently.
+
+ @param idx
+ The column index, must be less than GetColumnCount().
+
+ @see GetColumnAt()
+ */
+ unsigned int GetColumnPos(unsigned int idx) const;
+
+ /**
+ Reset the columns order to the natural one.
+
+ After calling this function, the column with index @c idx appears at
+ position @c idx in the control.
+ */
+ void ResetColumnsOrder();
+
+ /**
+ Helper function to manipulate the array of column indices.
+
+ This function reshuffles the array of column indices indexed by
+ positions (i.e. using the same convention as for SetColumnsOrder()) so
+ that the column with the given index is found at the specified
+ position.
+
+ @param order
+ Array containing the indices of columns in order of their
+ positions.
+ @param idx
+ The index of the column to move.
+ @param pos
+ The new position for the column @a idx.
+ */
+ static void MoveColumnInOrderArray(wxArrayInt& order,
+ unsigned int idx,
+ unsigned int pos);
+
+ /**
+ Show the popup menu allowing the user to show or hide the columns.
+
+ This functions shows the popup menu containing all columns with check
+ marks for the ones which are currently shown and allows the user to
+ check or uncheck them to toggle their visibility. It is called from the
+ default EVT_HEADER_RIGHT_CLICK handler for the controls which have
+ wxHD_ALLOW_HIDE style. And if the column has wxHD_ALLOW_REORDER style
+ as well, the menu also contains an item to customize the columns shown
+ using which results in ShowCustomizeDialog() being called, please see
+ its description for more details.
+
+ If a column was toggled, UpdateColumnVisibility() virtual function is
+ called so it must be implemented for the controls with wxHD_ALLOW_HIDE
+ style or if you call this function explicitly.
+
+ @param pt
+ The position of the menu, in the header window coordinates.
+ @param title
+ The title for the menu if not empty.
+ @return
+ @true if a column was shown or hidden or @false if nothing was
+ done, e.g. because the menu was cancelled.
+ */
+ bool ShowColumnsMenu(const wxPoint& pt, const wxString& title = wxString());
+
+ /**
+ Helper function appending the checkable items corresponding to all the
+ columns to the given menu.
+
+ This function is used by ShowColumnsMenu() but can also be used if you
+ show your own custom columns menu and still want all the columns shown
+ in it. It appends menu items with column labels as their text and
+ consecutive ids starting from @a idColumnsBase to the menu and checks
+ the items corresponding to the currently visible columns.
+
+ Example of use:
+ @code
+ wxMenu menu;
+ menu.Append(100, "Some custom command");
+ menu.AppendSeparator();
+ AddColumnsItems(menu, 200);
+ const int rc = GetPopupMenuSelectionFromUser(menu, pt);
+ if ( rc >= 200 )
+ ... toggle visibility of the column rc-200 ...
+ @endcode
+
+ @param menu
+ The menu to append the items to. It may be currently empty or not.
+ @param idColumnsBase
+ The id for the menu item corresponding to the first column, the
+ other ones are consecutive starting from it. It should be positive.
+ */
+ void AddColumnsItems(wxMenu& menu, int idColumnsBase = 0);
+
+ /**
+ Show the column customization dialog.
+
+ This function displays a modal dialog containing the list of all
+ columns which the user can use to reorder them as well as show or hide
+ individual columns.
+
+ If the user accepts the changes done in the dialog, the virtual
+ methods UpdateColumnVisibility() and UpdateColumnsOrder() will be
+ called so they must be overridden in the derived class if this method
+ is ever called. Please notice that the user will be able to invoke it
+ interactively from the header popup menu if the control has both
+ wxHD_ALLOW_HIDE and wxHD_ALLOW_REORDER styles.
+
+ @see wxRearrangeDialog
+ */
+ bool ShowCustomizeDialog();
+
+protected:
+ /**
+ Method to be implemented by the derived classes to return the
+ information for the given column.
+
+ @param idx
+ The column index, between 0 and the value last passed to
+ SetColumnCount().
+ */
+ virtual const wxHeaderColumnBase& GetColumn(unsigned int idx) const = 0;
+
+ /**
+ Method called when the column visibility is changed by the user.
+
+ This method is called from ShowColumnsMenu() or ShowCustomizeDialog()
+ when the user interactively hides or shows a column. A typical
+ implementation will simply update the internally stored column state.
+ Notice that there is no need to call UpdateColumn() from this method as
+ it is already done by wxHeaderCtrl itself.
+
+ The base class version doesn't do anything and must be overridden if
+ this method is called.
+
+ @param idx
+ The index of the column whose visibility was toggled.
+ @param show
+ The new visibility value, @true if the column is now shown or
+ @false if it is not hidden.
+ */
+ virtual void UpdateColumnVisibility(unsigned int idx, bool show);
+
+ /**
+ Method called when the columns order is changed in the customization
+ dialog.
+
+ This method is only called from ShowCustomizeDialog() when the user
+ changes the order of columns. In particular it is @em not called if a
+ single column changes place because the user dragged it to the new
+ location, the EVT_HEADER_END_REORDER event handler should be used to
+ react to this.
+
+ A typical implementation in a derived class will update the display
+ order of the columns in the associated control, if any. Notice that
+ there is no need to call SetColumnsOrder() from it as wxHeaderCtrl does
+ it itself.
+
+ The base class version doesn't do anything and must be overridden if
+ this method is called.
+
+ @param order
+ The new column order. This array uses the same convention as
+ SetColumnsOrder().
+ */
+ virtual void UpdateColumnsOrder(const wxArrayInt& order);
+
+ /**
+ Method which may be implemented by the derived classes to allow double
+ clicking the column separator to resize the column to fit its contents.
+
+ When a separator is double clicked, the default handler of
+ EVT_HEADER_SEPARATOR_DCLICK event calls this function and refreshes the
+ column if it returns @true so to implement the resizing of the column
+ to fit its width on header double click you need to implement this
+ method using logic similar to this example:
+ @code
+ class MyHeaderCtrl : public wxHeaderColumnBase
+ {
+ public:
+ ...
+
+ void SetWidth(int width) { m_width = width; }
+ virtual int GetWidth() const { return m_width; }
+
+ private:
+ int m_width;
+ };
+
+ class MyHeaderCtrl : public wxHeaderCtrl
+ {
+ public:
+ protected:
+ virtual wxHeaderColumnBase& GetColumn(unsigned int idx) const
+ {
+ return m_cols[idx];
+ }
+
+ virtual bool UpdateColumnWidthToFit(unsigned int idx, int widthTitle)
+ {
+ int widthContents = ... compute minimal width for column idx ...
+ m_cols[idx].SetWidth(wxMax(widthContents, widthTitle));
+ return true;
+ }
+
+ wxVector<MyHeaderColumn> m_cols;
+ };
+ @endcode
+
+ Base class version simply returns @false.
+
+ @param idx
+ The zero-based index of the column to update.
+ @param widthTitle
+ Contains minimal width needed to display the column header itself
+ and will usually be used as a starting point for the fitting width
+ calculation.
+
+ @return
+ @true to indicate that the column was resized, i.e. GetColumn() now
+ returns the new width value, and so must be refreshed or @false
+ meaning that the control didn't reach to the separator double click.
+ */
+ virtual bool UpdateColumnWidthToFit(unsigned int idx, int widthTitle);
+
+ /**
+ Can be overridden in the derived class to update internal data
+ structures when the number of the columns in the control changes.
+
+ This method is called by SetColumnCount() before effectively changing
+ the number of columns.
+
+ The base class version does nothing but it is good practice to still
+ call it from the overridden version in the derived class.
+ */
+ virtual void OnColumnCountChanging(unsigned int count);
+};
+
+
+/**
+ @class wxHeaderCtrlSimple
+
+ wxHeaderCtrlSimple is a concrete header control which can be used directly,
+ without inheriting from it as you need to do when using wxHeaderCtrl
+ itself.
+
+ When using it, you need to use simple AppendColumn(), InsertColumn() and
+ DeleteColumn() methods instead of setting the number of columns with
+ SetColumnCount() and returning the information about them from the
+ overridden GetColumn().
+
+ @library{wxcore}
+ @category{ctrl}
+
+ @see wxHeaderCtrl
+*/
+class wxHeaderCtrlSimple : public wxHeaderCtrl
+{
+public:
+ /**
+ Default constructor not creating the underlying window.
+
+ You must use Create() after creating the object using this constructor.
+ */
+ wxHeaderCtrlSimple();
+
+ /**
+ Constructor creating the window.
+
+ Please see the base class wxHeaderCtrl::Create() method for the
+ parameters description.
+ */
+ wxHeaderCtrlSimple(wxWindow *parent,
+ wxWindowID winid = wxID_ANY,
+ const wxPoint& pos = wxDefaultPosition,
+ const wxSize& size = wxDefaultSize,
+ long style = wxHD_DEFAULT_STYLE,
+ const wxString& name = wxHeaderCtrlNameStr);
+
/**
Insert the column at the given position.
@see AppendColumn()
*/
- void InsertColumn(const wxHeaderColumn& col, unsigned int idx);
+ void InsertColumn(const wxHeaderColumnSimple& col, unsigned int idx);
/**
Append the column to the end of the control.
@see InsertColumn()
*/
- void AppendColumn(const wxHeaderColumn& col);
+ void AppendColumn(const wxHeaderColumnSimple& col);
/**
Delete the column at the given position.
ascending or descending sort order respectively, if @c -1 remove
the currently shown sort indicator.
*/
- virtual void ShowSortIndicator(unsigned int idx, int sortOrder);
+ void ShowSortIndicator(unsigned int idx, bool ascending = true);
/**
Remove the sort indicator from the given column.
@param idx
The column to remove sort indicator for.
*/
- void RemoveSortIndicator(unsigned int idx);
+ void RemoveSortIndicator();
+
+protected:
+ /**
+ This function can be overridden in the classes deriving from this
+ control instead of overriding UpdateColumnWidthToFit().
+
+ To implement automatic column resizing to fit its contents width when
+ the column divider is double clicked, you need to simply return the
+ fitting width for the given column @a idx from this method, the control
+ will automatically use the biggest value between the one returned from
+ here and the one needed for the display of the column title itself.
+
+ The base class version returns -1 indicating that this function is not
+ implemented.
+ */
+ virtual int GetBestFittingWidth(unsigned int idx) const;
+};
+
+/**
+ @class wxHeaderCtrlEvent
+
+ Event class representing the events generated by wxHeaderCtrl.
+
+ @library{wxcore}
+ @category{ctrl}
+
+ @see wxHeaderCtrl
+*/
+class wxHeaderCtrlEvent : public wxNotifyEvent
+{
+public:
+ /**
+ Return the index of the column affected by this event.
+
+ This method can be called for all header control events.
+ */
+ int GetColumn() const;
+
+ /**
+ Return the current width of the column.
+
+ This method can only be called for the dragging events.
+ */
+ int GetWidth() const;
+
+ /**
+ Return the new order of the column.
+
+ This method can only be called for end reorder event for which it
+ indicates the tentative new position for the column GetColumn()
+ selected by the user. If the event is not vetoed, this will become the
+ new column position in wxHeaderCtrl::GetColumnsOrder().
+ */
+ unsigned int GetNewOrder() const;
};
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