Version: 2.9.4
Public Member Functions | Static Public Member Functions | Protected Member Functions
wxHeaderCtrl Class Reference

#include </home/zeitlin/src/wx/github/interface/wx/headerctrl.h>

Inheritance diagram for wxHeaderCtrl:

Detailed Description

wxHeaderCtrl is the control containing the column headings which is usually used for display of tabular data.

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. 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.

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:

Styles

This class supports the following styles:

Events emitted by this class

The following event handler macros redirect the events to member function handlers 'func' with prototypes like:

void handlerFuncName(wxHeaderCtrlEvent& event)

Event macros for events emitted by this class:

Library:  wxCore
Category:  Controls
参照:
wxGrid, wxListCtrl, wxDataViewCtrl

Public Member Functions

 wxHeaderCtrl ()
 Default constructor not creating the underlying window.
 wxHeaderCtrl (wxWindow *parent, wxWindowID winid=wxID_ANY, const wxPoint &pos=wxDefaultPosition, const wxSize &size=wxDefaultSize, long style=wxHD_DEFAULT_STYLE, const wxString &name=wxHeaderCtrlNameStr)
 Constructor creating the window.
bool Create (wxWindow *parent, wxWindowID winid=wxID_ANY, const wxPoint &pos=wxDefaultPosition, const wxSize &size=wxDefaultSize, long style=wxHD_DEFAULT_STYLE, const wxString &name=wxHeaderCtrlNameStr)
 Create the header control window.
void SetColumnCount (unsigned int count)
 Set the number of columns in the control.
unsigned int GetColumnCount () const
 Return the number of columns in the control.
bool IsEmpty () const
 Return whether the control has any columns.
void UpdateColumn (unsigned int idx)
 Update the column with the given index.
void SetColumnsOrder (const wxArrayInt &order)
 Change the columns display order.
wxArrayInt GetColumnsOrder () const
 Return the array describing the columns display order.
unsigned int GetColumnAt (unsigned int pos) const
 Return the index of the column displayed at the given position.
unsigned int GetColumnPos (unsigned int idx) const
 Get the position at which this column is currently displayed.
void ResetColumnsOrder ()
 Reset the columns order to the natural one.
bool ShowColumnsMenu (const wxPoint &pt, const wxString &title=wxString())
 Show the popup menu allowing the user to show or hide the columns.
void AddColumnsItems (wxMenu &menu, int idColumnsBase=0)
 Helper function appending the checkable items corresponding to all the columns to the given menu.
bool ShowCustomizeDialog ()
 Show the column customization dialog.
int GetColumnTitleWidth (const wxHeaderColumn &col)
 Returns width needed for given column's title.

Static Public Member Functions

static void MoveColumnInOrderArray (wxArrayInt &order, unsigned int idx, unsigned int pos)
 Helper function to manipulate the array of column indices.

Protected Member Functions

virtual const wxHeaderColumnGetColumn (unsigned int idx) const =0
 Method to be implemented by the derived classes to return the information for the given column.
virtual void UpdateColumnVisibility (unsigned int idx, bool show)
 Method called when the column visibility is changed by the user.
virtual void UpdateColumnsOrder (const wxArrayInt &order)
 Method called when the columns order is changed in the customization dialog.
virtual bool UpdateColumnWidthToFit (unsigned int idx, int widthTitle)
 Method which may be implemented by the derived classes to allow double clicking the column separator to resize the column to fit its contents.
virtual void OnColumnCountChanging (unsigned int count)
 Can be overridden in the derived class to update internal data structures when the number of the columns in the control changes.

List of all members.


Constructor & Destructor Documentation

wxHeaderCtrl::wxHeaderCtrl ( )

Default constructor not creating the underlying window.

You must use Create() after creating the object using this constructor.

wxHeaderCtrl::wxHeaderCtrl ( wxWindow parent,
wxWindowID  winid = wxID_ANY,
const wxPoint pos = wxDefaultPosition,
const wxSize size = wxDefaultSize,
long  style = wxHD_DEFAULT_STYLE,
const wxString name = wxHeaderCtrlNameStr 
)

Constructor creating the window.

Please see Create() for the parameters documentation.


Member Function Documentation

void wxHeaderCtrl::AddColumnsItems ( wxMenu menu,
int  idColumnsBase = 0 
)

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 idColumnsBase to the menu and checks the items corresponding to the currently visible columns.

Example of use:

            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 ...
Parameters:
menuThe menu to append the items to. It may be currently empty or not.
idColumnsBaseThe id for the menu item corresponding to the first column, the other ones are consecutive starting from it. It should be positive.
bool wxHeaderCtrl::Create ( wxWindow parent,
wxWindowID  winid = wxID_ANY,
const wxPoint pos = wxDefaultPosition,
const wxSize size = wxDefaultSize,
long  style = wxHD_DEFAULT_STYLE,
const wxString name = wxHeaderCtrlNameStr 
)

Create the header control window.

Parameters:
parentThe parent window. The header control should be typically positioned along the top edge of this window.
winidId of the control or wxID_ANY if you don't care.
posThe initial position of the control.
sizeThe initial size of the control (usually not very useful as this control will typically be resized to have the same width as the associated data display control).
styleThe control style, 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 if this is undesirable.
nameThe name of the control.

Reimplemented from wxWindow.

virtual const wxHeaderColumn& wxHeaderCtrl::GetColumn ( unsigned int  idx) const [protected, pure virtual]

Method to be implemented by the derived classes to return the information for the given column.

Parameters:
idxThe column index, between 0 and the value last passed to SetColumnCount().
unsigned int wxHeaderCtrl::GetColumnAt ( unsigned int  pos) const

Return the index of the column displayed at the given position.

Parameters:
posThe display position, e.g. 0 for the left-most column, 1 for the next one and so on until GetColumnCount() - 1.
参照:
GetColumnPos()
unsigned int wxHeaderCtrl::GetColumnCount ( ) const

Return the number of columns in the control.

Returns:
Number of columns as previously set by SetColumnCount().
参照:
IsEmpty()
unsigned int wxHeaderCtrl::GetColumnPos ( unsigned int  idx) const

Get the position at which this column is currently displayed.

Notice that a valid position is returned even for the hidden columns currently.

Parameters:
idxThe column index, must be less than GetColumnCount().
参照:
GetColumnAt()
wxArrayInt wxHeaderCtrl::GetColumnsOrder ( ) const

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.

int wxHeaderCtrl::GetColumnTitleWidth ( const wxHeaderColumn col)

Returns width needed for given column's title.

Since:
2.9.4
bool wxHeaderCtrl::IsEmpty ( ) const

Return whether the control has any columns.

参照:
GetColumnCount()
static void wxHeaderCtrl::MoveColumnInOrderArray ( wxArrayInt order,
unsigned int  idx,
unsigned int  pos 
) [static]

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.

Parameters:
orderArray containing the indices of columns in order of their positions.
idxThe index of the column to move.
posThe new position for the column idx.
virtual void wxHeaderCtrl::OnColumnCountChanging ( unsigned int  count) [protected, virtual]

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.

void wxHeaderCtrl::ResetColumnsOrder ( )

Reset the columns order to the natural one.

After calling this function, the column with index idx appears at position idx in the control.

void wxHeaderCtrl::SetColumnCount ( unsigned int  count)

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 wxHeaderCtrl::SetColumnsOrder ( const wxArrayInt order)

Change the columns display order.

The display order defines the order in which the columns appear on the screen and does not affect the interpretation of indices by all the other class methods.

The order array specifies the column indices corresponding to the display positions.

Parameters:
orderA 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).
参照:
wxListCtrl::SetColumnsOrder()
bool wxHeaderCtrl::ShowColumnsMenu ( const wxPoint pt,
const wxString title = wxString() 
)

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.

Parameters:
ptThe position of the menu, in the header window coordinates.
titleThe title for the menu if not empty.
Returns:
true if a column was shown or hidden or false if nothing was done, e.g. because the menu was cancelled.
bool wxHeaderCtrl::ShowCustomizeDialog ( )

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.

参照:
wxRearrangeDialog
void wxHeaderCtrl::UpdateColumn ( unsigned int  idx)

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.

Parameters:
idxThe column index, must be less than GetColumnCount().
virtual void wxHeaderCtrl::UpdateColumnsOrder ( const wxArrayInt order) [protected, virtual]

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 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.

Parameters:
orderThe new column order. This array uses the same convention as SetColumnsOrder().
virtual void wxHeaderCtrl::UpdateColumnVisibility ( unsigned int  idx,
bool  show 
) [protected, virtual]

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.

Parameters:
idxThe index of the column whose visibility was toggled.
showThe new visibility value, true if the column is now shown or false if it is not hidden.
virtual bool wxHeaderCtrl::UpdateColumnWidthToFit ( unsigned int  idx,
int  widthTitle 
) [protected, virtual]

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:

            class MyHeaderColumn : public wxHeaderColumn
            {
            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 wxHeaderColumn& 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;
            };

Base class version simply returns false.

Parameters:
idxThe zero-based index of the column to update.
widthTitleContains minimal width needed to display the column header itself and will usually be used as a starting point for the fitting width calculation.
Returns:
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.
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