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_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.
@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_DRAGDROP 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
{
*/
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_DRAGDROP 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_DRAGDROP 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;
+
+ /**
+ 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);
+
protected:
/**
Method to be implemented by the derived classes to return the
SetColumnCount().
*/
virtual wxHeaderColumnBase& GetColumn(unsigned int idx) = 0;
+
+ /**
+ 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)
+ {
+ 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);
};
The column to remove sort indicator for.
*/
void RemoveSortIndicator(unsigned int idx);
+
+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;
};
projects / wxWidgets.git / blobdiff