return NULL from GetVoidPtr() for NULL variants instead of asserting (closes #9873)

[wxWidgets.git] / include / wx / msw / listctrl.h

/////////////////////////////////////////////////////////////////////////////
// Name:        wx/msw/listctrl.h
// Purpose:     wxListCtrl class
// Author:      Julian Smart
// Modified by: Agron Selimaj
// Created:     01/02/97
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_LISTCTRL_H_
#define _WX_LISTCTRL_H_

#include "wx/textctrl.h"
#include "wx/dynarray.h"

class WXDLLIMPEXP_FWD_CORE wxImageList;

// define this symbol to indicate the availability of SetColumnsOrder() and
// related functions
#define wxHAS_LISTCTRL_COLUMN_ORDER

/*
    The wxListCtrl can show lists of items in four different modes:
    wxLC_LIST:   multicolumn list view, with optional small icons (icons could be
                 optional for some platforms). Columns are computed automatically,
                 i.e. you don't set columns as in wxLC_REPORT. In other words,
                 the list wraps, unlike a wxListBox.
    wxLC_REPORT: single or multicolumn report view (with optional header)
    wxLC_ICON:   large icon view, with optional labels
    wxLC_SMALL_ICON: small icon view, with optional labels

    You can change the style dynamically, either with SetSingleStyle or
    SetWindowStyleFlag.

    Further window styles:

    wxLC_ALIGN_TOP          icons align to the top (default)
    wxLC_ALIGN_LEFT         icons align to the left
    wxLC_AUTOARRANGE        icons arrange themselves
    wxLC_USER_TEXT          the app provides label text on demand, except for column headers
    wxLC_EDIT_LABELS        labels are editable: app will be notified.
    wxLC_NO_HEADER          no header in report mode
    wxLC_NO_SORT_HEADER     can't click on header
    wxLC_SINGLE_SEL         single selection
    wxLC_SORT_ASCENDING     sort ascending (must still supply a comparison callback in SortItems)
    wxLC_SORT_DESCENDING    sort descending (ditto)

    Items are referred to by their index (position in the list starting from zero).

    Label text is supplied via insertion/setting functions and is stored by the
    control, unless the wxLC_USER_TEXT style has been specified, in which case
    the app will be notified when text is required (see sample).

    Images are dealt with by (optionally) associating 3 image lists with the control.
    Zero-based indexes into these image lists indicate which image is to be used for
    which item. Each image in an image list can contain a mask, and can be made out
    of either a bitmap, two bitmaps or an icon. See ImagList.h for more details.

    Notifications are passed via the wxWidgets 2.0 event system, or using virtual
    functions in wxWidgets 1.66.

    See the sample wxListCtrl app for API usage.

    TODO:
     - addition of further convenience functions
       to avoid use of wxListItem in some functions
     - state/overlay images: probably not needed.
     - in Win95, you can be called back to supply other information
       besides text, such as state information. This saves no memory
       and is probably superfluous to requirements.
     - testing of whole API, extending current sample.


 */

class WXDLLIMPEXP_CORE wxListCtrl: public wxControl
{
public:
    /*
     * Public interface
     */

    wxListCtrl() { Init(); }

    wxListCtrl(wxWindow *parent,
               wxWindowID id = wxID_ANY,
               const wxPoint& pos = wxDefaultPosition,
               const wxSize& size = wxDefaultSize,
               long style = wxLC_ICON,
               const wxValidator& validator = wxDefaultValidator,
               const wxString& name = wxListCtrlNameStr)
    {
        Init();

        Create(parent, id, pos, size, style, validator, name);
    }

    virtual ~wxListCtrl();

    bool Create(wxWindow *parent,
                wxWindowID id = wxID_ANY,
                const wxPoint& pos = wxDefaultPosition,
                const wxSize& size = wxDefaultSize,
                long style = wxLC_ICON,
                const wxValidator& validator = wxDefaultValidator,
                const wxString& name = wxListCtrlNameStr);


    // Attributes
    ////////////////////////////////////////////////////////////////////////////

    // Set the control colours
    bool SetForegroundColour(const wxColour& col);
    bool SetBackgroundColour(const wxColour& col);

    // Gets information about this column
    bool GetColumn(int col, wxListItem& item) const;

    // Sets information about this column
    bool SetColumn(int col, const wxListItem& item);

    // Gets the column width
    int GetColumnWidth(int col) const;

    // Sets the column width
    bool SetColumnWidth(int col, int width);


    // Gets the column order from its index or index from its order
    int GetColumnOrder(int col) const;
    int GetColumnIndexFromOrder(int order) const;

    // Gets the column order for all columns
    wxArrayInt GetColumnsOrder() const;

    // Sets the column order for all columns
    bool SetColumnsOrder(const wxArrayInt& orders);


    // Gets the number of items that can fit vertically in the
    // visible area of the list control (list or report view)
    // or the total number of items in the list control (icon
    // or small icon view)
    int GetCountPerPage() const;

    // return the total area occupied by all the items (icon/small icon only)
    wxRect GetViewRect() const;

    // Gets the edit control for editing labels.
    wxTextCtrl* GetEditControl() const;

    // Gets information about the item
    bool GetItem(wxListItem& info) const;

    // Sets information about the item
    bool SetItem(wxListItem& info);

    // Sets a string field at a particular column
    long SetItem(long index, int col, const wxString& label, int imageId = -1);

    // Gets the item state
    int  GetItemState(long item, long stateMask) const;

    // Sets the item state
    bool SetItemState(long item, long state, long stateMask);

    // Sets the item image
    bool SetItemImage(long item, int image, int selImage = -1);
    bool SetItemColumnImage(long item, long column, int image);

    // Gets the item text
    wxString GetItemText(long item) const;

    // Sets the item text
    void SetItemText(long item, const wxString& str);

    // Gets the item data
    wxUIntPtr GetItemData(long item) const;

    // Sets the item data
    bool SetItemPtrData(long item, wxUIntPtr data);
    bool SetItemData(long item, long data) { return SetItemPtrData(item, data); }

    // Gets the item rectangle
    bool GetItemRect(long item, wxRect& rect, int code = wxLIST_RECT_BOUNDS) const;

    // Gets the subitem rectangle in report mode
    bool GetSubItemRect(long item, long subItem, wxRect& rect, int code = wxLIST_RECT_BOUNDS) const;

    // Gets the item position
    bool GetItemPosition(long item, wxPoint& pos) const;

    // Sets the item position
    bool SetItemPosition(long item, const wxPoint& pos);

    // Gets the number of items in the list control
    int GetItemCount() const;

    // Gets the number of columns in the list control
    int GetColumnCount() const { return m_colCount; }

    // get the horizontal and vertical components of the item spacing
    wxSize GetItemSpacing() const;

    // Foreground colour of an item.
    void SetItemTextColour( long item, const wxColour& col);
    wxColour GetItemTextColour( long item ) const;

    // Background colour of an item.
    void SetItemBackgroundColour( long item, const wxColour &col);
    wxColour GetItemBackgroundColour( long item ) const;

    // Font of an item.
    void SetItemFont( long item, const wxFont &f);
    wxFont GetItemFont( long item ) const;

    // Gets the number of selected items in the list control
    int GetSelectedItemCount() const;

    // Gets the text colour of the listview
    wxColour GetTextColour() const;

    // Sets the text colour of the listview
    void SetTextColour(const wxColour& col);

    // Gets the index of the topmost visible item when in
    // list or report view
    long GetTopItem() const;

    // Add or remove a single window style
    void SetSingleStyle(long style, bool add = true);

    // Set the whole window style
    void SetWindowStyleFlag(long style);

    // Searches for an item, starting from 'item'.
    // item can be -1 to find the first item that matches the
    // specified flags.
    // Returns the item or -1 if unsuccessful.
    long GetNextItem(long item, int geometry = wxLIST_NEXT_ALL, int state = wxLIST_STATE_DONTCARE) const;

    // Gets one of the three image lists
    wxImageList *GetImageList(int which) const;

    // Sets the image list
    // N.B. There's a quirk in the Win95 list view implementation.
    // If in wxLC_LIST mode, it'll *still* display images by the labels if
    // there's a small-icon image list set for the control - even though you
    // haven't specified wxLIST_MASK_IMAGE when inserting.
    // So you have to set a NULL small-icon image list to be sure that
    // the wxLC_LIST mode works without icons. Of course, you may want icons...
    void SetImageList(wxImageList *imageList, int which);
    void AssignImageList(wxImageList *imageList, int which);

    // are we in report mode?
    bool InReportView() const { return HasFlag(wxLC_REPORT); }

    // are we in virtual report mode?
    bool IsVirtual() const { return HasFlag(wxLC_VIRTUAL); }

    // refresh items selectively (only useful for virtual list controls)
    void RefreshItem(long item);
    void RefreshItems(long itemFrom, long itemTo);

    // Operations
    ////////////////////////////////////////////////////////////////////////////

    // Arranges the items
    bool Arrange(int flag = wxLIST_ALIGN_DEFAULT);

    // Deletes an item
    bool DeleteItem(long item);

    // Deletes all items
    bool DeleteAllItems();

    // Deletes a column
    bool DeleteColumn(int col);

    // Deletes all columns
    bool DeleteAllColumns();

    // Clears items, and columns if there are any.
    void ClearAll();

    // Edit the label
    wxTextCtrl* EditLabel(long item, wxClassInfo* textControlClass = CLASSINFO(wxTextCtrl));

    // End label editing, optionally cancelling the edit
    bool EndEditLabel(bool cancel);

    // Ensures this item is visible
    bool EnsureVisible(long item);

    // Find an item whose label matches this string, starting from the item after 'start'
    // or the beginning if 'start' is -1.
    long FindItem(long start, const wxString& str, bool partial = false);

    // Find an item whose data matches this data, starting from the item after 'start'
    // or the beginning if 'start' is -1.
    long FindItem(long start, wxUIntPtr data);

    // Find an item nearest this position in the specified direction, starting from
    // the item after 'start' or the beginning if 'start' is -1.
    long FindItem(long start, const wxPoint& pt, int direction);

    // Determines which item (if any) is at the specified point,
    // giving details in 'flags' (see wxLIST_HITTEST_... flags above)
    // Request the subitem number as well at the given coordinate.
    long HitTest(const wxPoint& point, int& flags, long* ptrSubItem = NULL) const;

    // Inserts an item, returning the index of the new item if successful,
    // -1 otherwise.
    long InsertItem(const wxListItem& info);

    // Insert a string item
    long InsertItem(long index, const wxString& label);

    // Insert an image item
    long InsertItem(long index, int imageIndex);

    // Insert an image/string item
    long InsertItem(long index, const wxString& label, int imageIndex);

    // For list view mode (only), inserts a column.
    long InsertColumn(long col, const wxListItem& info);

    long InsertColumn(long col,
                      const wxString& heading,
                      int format = wxLIST_FORMAT_LEFT,
                      int width = -1);

    // set the number of items in a virtual list control
    void SetItemCount(long count);

    // Scrolls the list control. If in icon, small icon or report view mode,
    // x specifies the number of pixels to scroll. If in list view mode, x
    // specifies the number of columns to scroll.
    // If in icon, small icon or list view mode, y specifies the number of pixels
    // to scroll. If in report view mode, y specifies the number of lines to scroll.
    bool ScrollList(int dx, int dy);

    // Sort items.

    // fn is a function which takes 3 long arguments: item1, item2, data.
    // item1 is the long data associated with a first item (NOT the index).
    // item2 is the long data associated with a second item (NOT the index).
    // data is the same value as passed to SortItems.
    // The return value is a negative number if the first item should precede the second
    // item, a positive number of the second item should precede the first,
    // or zero if the two items are equivalent.

    // data is arbitrary data to be passed to the sort function.
    bool SortItems(wxListCtrlCompare fn, long data);

    // IMPLEMENTATION
    virtual bool MSWCommand(WXUINT param, WXWORD id);
    virtual bool MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result);
    virtual bool MSWShouldPreProcessMessage(WXMSG* msg);

    // bring the control in sync with current m_windowStyle value
    void UpdateStyle();

    // Event handlers
    ////////////////////////////////////////////////////////////////////////////
    // Necessary for drawing hrules and vrules, if specified
    void OnPaint(wxPaintEvent& event);


    virtual bool ShouldInheritColours() const { return false; }

    virtual wxVisualAttributes GetDefaultAttributes() const
    {
        return GetClassDefaultAttributes(GetWindowVariant());
    }

    static wxVisualAttributes
    GetClassDefaultAttributes(wxWindowVariant variant = wxWINDOW_VARIANT_NORMAL);


#if WXWIN_COMPATIBILITY_2_6
    // obsolete stuff, for compatibility only -- don't use
    wxDEPRECATED( int GetItemSpacing(bool isSmall) const);
#endif // WXWIN_COMPATIBILITY_2_6

    // convert our styles to Windows
    virtual WXDWORD MSWGetStyle(long style, WXDWORD *exstyle) const;

    // special Windows message handling
    virtual WXLRESULT MSWWindowProc(WXUINT nMsg,
                                    WXWPARAM wParam,
                                    WXLPARAM lParam);

protected:
    // common part of all ctors
    void Init();

    // free memory taken by all internal data
    void FreeAllInternalData();

    // get the item attribute, either by quering it for virtual control, or by
    // returning the one previously set using setter methods for a normal one
    wxListItemAttr *DoGetItemAttr(long item) const;


    wxTextCtrl*       m_textCtrl;        // The control used for editing a label
    wxImageList *     m_imageListNormal; // The image list for normal icons
    wxImageList *     m_imageListSmall;  // The image list for small icons
    wxImageList *     m_imageListState;  // The image list state icons (not implemented yet)
    bool              m_ownsImageListNormal,
                      m_ownsImageListSmall,
                      m_ownsImageListState;

    int               m_colCount;   // Windows doesn't have GetColumnCount so must
                                    // keep track of inserted/deleted columns
    long              m_count;      // Keep track of item count to save calls to
                                    // ListView_GetItemCount
    bool              m_ignoreChangeMessages;

    // true if we have any internal data (user data & attributes)
    bool m_AnyInternalData;

    // true if we have any items with custom attributes
    bool m_hasAnyAttr;

    // these functions are only used for virtual list view controls, i.e. the
    // ones with wxLC_VIRTUAL style

    // return the text for the given column of the given item
    virtual wxString OnGetItemText(long item, long column) const;

    // return the icon for the given item. In report view, OnGetItemImage will
    // only be called for the first column. See OnGetItemColumnImage for
    // details.
    virtual int OnGetItemImage(long item) const;

    // return the icon for the given item and column.
    virtual int OnGetItemColumnImage(long item, long column) const;

    // return the attribute for the item (may return NULL if none)
    virtual wxListItemAttr *OnGetItemAttr(long item) const;

private:
    // process NM_CUSTOMDRAW notification message
    WXLPARAM OnCustomDraw(WXLPARAM lParam);

    // set the extended styles for the control (used by Create() and
    // UpdateStyle()), only should be called if InReportView()
    void MSWSetExListStyles();

    // initialize the (already created) m_textCtrl with the associated HWND
    void InitEditControl(WXHWND hWnd);

    // destroy m_textCtrl if it's currently valid and reset it to NULL
    void DeleteEditControl();


    DECLARE_DYNAMIC_CLASS(wxListCtrl)
    DECLARE_EVENT_TABLE()
    DECLARE_NO_COPY_CLASS(wxListCtrl)
};

#endif // _WX_LISTCTRL_H_