Fl_Table Class Reference

A table of widgets or other content. More...

`#include <Fl_Table.H>`

Inheritance diagram for Fl_Table:

## Public Types

enum | TableContext { CONTEXT_NONE = 0, CONTEXT_STARTPAGE = 0x01, CONTEXT_ENDPAGE = 0x02, CONTEXT_ROW_HEADER = 0x04, CONTEXT_COL_HEADER = 0x08, CONTEXT_CELL = 0x10, CONTEXT_TABLE = 0x20, CONTEXT_RC_RESIZE = 0x40 }
| The context bit flags for Fl_Table related callbacks (eg. More...

## Public Member Functions

void | add (Fl_Widget &wgt)
void | add (Fl_Widget *wgt)
Fl_Widget *const * | array ()
void | begin ()
void | callback (Fl_Widget *, void *)
| Callbacks will be called depending on the setting of Fl_Widget::when(). More...
int | callback_col ()
| Returns the current column the event occurred on. More...
TableContext | callback_context ()
| Returns the current 'table context'. More...
int | callback_row ()
| Returns the current row the event occurred on. More...
Fl_Widget * | child (int n) const
| Returns the child widget by an index. More...
int | children () const
| Returns the number of children in the table. More...
virtual void | clear ()
| Clears the table to zero rows (rows(0)), zero columns (cols(0)), and clears any widgets (table->clear()) that were added with begin()/end() or add()/insert()/etc. More...
int | col_header ()
| Returns if column headers are enabled or not.
void | col_header (int flag)
| Enable or disable column headers. More...
void | col_header_color (Fl_Color val)
| Sets the color for column headers and redraws the table.
Fl_Color | col_header_color ()
| Gets the color for column headers.
void | col_header_height (int height)
| Sets the height in pixels for column headers and redraws the table.
int | col_header_height ()
| Gets the column header height.
void | col_position (int col)
| Sets the column scroll position to column 'col', and causes the screen to redraw.
int | col_position ()
| Returns the current column scroll position as a column number.
int | col_resize ()
| Returns the current value of this flag.
void | col_resize (int flag)
| Allows/disallows column resizing by the user. More...
int | col_resize_min ()
| Sets the current column minimum resize value. More...
void | col_resize_min (int val)
| Returns the current column minimum resize value.
void | col_width (int col, int width)
| Sets the width of the specified column in pixels, and the table is redrawn. More...
int | col_width (int col)
| Returns the current width of the specified column in pixels.
void | col_width_all (int width)
| Convenience method to set the width of all columns to the same value, in pixels. More...
virtual void | cols (int val)
| Set the number of columns in the table and redraw.
int | cols ()
| Get the number of columns in the table.
void | do_callback (TableContext context, int row, int col)
void | draw (void)
| Draws the widget. More...
void | end ()
int | find (const Fl_Widget *wgt) const
int | find (const Fl_Widget &wgt) const
| Fl_Table (int X, int Y, int W, int H, const char *l=0)
| The constructor for the Fl_Table. More...
void | get_selection (int &row_top, int &col_left, int &row_bot, int &col_right)
| Gets the region of cells selected (highlighted). More...
void | init_sizes ()
void | insert (Fl_Widget &wgt, int n)
void | insert (Fl_Widget &wgt, Fl_Widget *w2)
int | is_interactive_resize ()
| Returns 1 if someone is interactively resizing a row or column. More...
int | is_selected (int r, int c)
| See if the cell at row `r` and column `c` is selected. More...
int | move_cursor (int R, int C, int shiftselect)
int | move_cursor (int R, int C)
void | remove (Fl_Widget &wgt)
void | resize (int X, int Y, int W, int H)
| Changes the size of the Fl_Table, causing it to redraw.
int | row_header ()
| Returns the value of this flag.
void | row_header (int flag)
| Enables/disables showing the row headers. More...
void | row_header_color (Fl_Color val)
| Sets the row header color and causes the screen to redraw.
Fl_Color | row_header_color ()
| Returns the current row header color.
void | row_header_width (int width)
| Sets the row header width to n and causes the screen to redraw.
int | row_header_width ()
| Returns the current row header width (in pixels).
void | row_height (int row, int height)
| Sets the height of the specified row in pixels, and the table is redrawn. More...
int | row_height (int row)
| Returns the current height of the specified row as a value in pixels.
void | row_height_all (int height)
| Convenience method to set the height of all rows to the same value, in pixels. More...
void | row_position (int row)
| Sets the row scroll position to 'row', and causes the screen to redraw.
int | row_position ()
| Returns the current row scroll position as a row number.
int | row_resize ()
| Returns the current value of this flag.
void | row_resize (int flag)
| Allows/disallows row resizing by the user. More...
int | row_resize_min ()
| Returns the current row minimum resize value.
void | row_resize_min (int val)
| Sets the current row minimum resize value. More...
virtual void | rows (int val)
| Sets the number of rows in the table, and the table is redrawn.
int | rows ()
| Returns the number of rows in the table.
void | set_selection (int row_top, int col_left, int row_bot, int col_right)
| Sets the region of cells to be selected (highlighted). More...
void | table_box (Fl_Boxtype val)
| Sets the kind of box drawn around the data table, the default being FL_NO_BOX. More...
Fl_Boxtype | table_box (void)
| Returns the current box type used for the data table.
void | top_row (int row)
| Sets which row should be at the top of the table, scrolling as necessary, and the table is redrawn. More...
int | top_row ()
| Returns the current top row shown in the table. More...
void | visible_cells (int &r1, int &r2, int &c1, int &c2)
| Returns the range of row and column numbers for all visible and partially visible cells in the table. More...
void | when (Fl_When flags)
| The Fl_Widget::when() function is used to set a group of flags, determining when the widget callback is called: More...
| ~Fl_Table ()
| The destructor for the Fl_Table. More...
Public Member Functions inherited from Fl_Group
Fl_Widget *& | _ddfdesign_kludge ()
| This is for forms compatibility only.
void | add (Fl_Widget &)
| The widget is removed from its current group (if any) and then added to the end of this group.
void | add (Fl_Widget *o)
| See void Fl_Group::add(Fl_Widget &w)
void | add_resizable (Fl_Widget &o)
| Adds a widget to the group and makes it the resizable widget.
Fl_Widget *const * | array () const
| Returns a pointer to the array of children. More...
virtual Fl_Group * | as_group ()
| Returns an Fl_Group pointer if this widget is an Fl_Group. More...
void | begin ()
| Sets the current group so you can build the widget tree by just constructing the widgets. More...
Fl_Widget * | child (int n) const
| Returns array()[n]. More...
int | children () const
| Returns how many child widgets the group has.
void | clear ()
| Deletes all child widgets from memory recursively. More...
void | clip_children (int c)
| Controls whether the group widget clips the drawing of child widgets to its bounding box. More...
unsigned int | clip_children ()
| Returns the current clipping mode. More...
void | end ()
| Exactly the same as current(this->parent()). More...
int | find (const Fl_Widget *) const
| Searches the child array for the widget and returns the index. More...
int | find (const Fl_Widget &o) const
| See int Fl_Group::find(const Fl_Widget *w) const.
| Fl_Group (int, int, int, int, const char *=0)
| Creates a new Fl_Group widget using the given position, size, and label string. More...
void | focus (Fl_Widget *W)
void | forms_end ()
| This is for forms compatibility only.
void | init_sizes ()
| Resets the internal array of widget sizes and positions. More...
void | insert (Fl_Widget &, int i)
| The widget is removed from its current group (if any) and then inserted into this group. More...
void | insert (Fl_Widget &o, Fl_Widget *before)
| This does insert(w, find(before)). More...
void | remove (int index)
| Removes the widget at `index` from the group but does not delete it. More...
void | remove (Fl_Widget &)
| Removes a widget from the group but does not delete it. More...
void | remove (Fl_Widget *o)
| Removes the widget `o` from the group. More...
void | resizable (Fl_Widget &o)
| See void Fl_Group::resizable(Fl_Widget *box)
void | resizable (Fl_Widget *o)
| The resizable widget defines the resizing box for the group. More...
Fl_Widget * | resizable () const
| See void Fl_Group::resizable(Fl_Widget *box)
virtual | ~Fl_Group ()
| The destructor also deletes all the children. More...
Public Member Functions inherited from Fl_Widget
void | _clear_fullscreen ()
void | _set_fullscreen ()
void | activate ()
| Activates the widget. More...
unsigned int | active () const
| Returns whether the widget is active. More...
int | active_r () const
| Returns whether the widget and all of its parents are active. More...
Fl_Align | align () const
| Gets the label alignment. More...
void | align (Fl_Align alignment)
| Sets the label alignment. More...
long | argument () const
| Gets the current user data (long) argument that is passed to the callback function.
void | argument (long v)
| Sets the current user data (long) argument that is passed to the callback function. More...
virtual class Fl_Gl_Window * | as_gl_window ()
| Returns an Fl_Gl_Window pointer if this widget is an Fl_Gl_Window. More...
virtual Fl_Window * | as_window ()
| Returns an Fl_Window pointer if this widget is an Fl_Window. More...
Fl_Boxtype | box () const
| Gets the box type of the widget. More...
void | box (Fl_Boxtype new_box)
| Sets the box type for the widget. More...
Fl_Callback_p | callback () const
| Gets the current callback function for the widget. More...
void | callback (Fl_Callback *cb, void *p)
| Sets the current callback function for the widget. More...
void | callback (Fl_Callback *cb)
| Sets the current callback function for the widget. More...
void | callback (Fl_Callback0 *cb)
| Sets the current callback function for the widget. More...
void | callback (Fl_Callback1 *cb, long p=0)
| Sets the current callback function for the widget. More...
unsigned int | changed () const
| Checks if the widget value changed since the last callback. More...
void | clear_changed ()
| Marks the value of the widget as unchanged. More...
void | clear_damage (uchar c=0)
| Clears or sets the damage flags. More...
void | clear_output ()
| Sets a widget to accept input. More...
void | clear_visible ()
| Hides the widget. More...
void | clear_visible_focus ()
| Disables keyboard focus navigation with this widget. More...
Fl_Color | color () const
| Gets the background color of the widget. More...
void | color (Fl_Color bg)
| Sets the background color of the widget. More...
void | color (Fl_Color bg, Fl_Color sel)
| Sets the background and selection color of the widget. More...
Fl_Color | color2 () const
| For back compatibility only. More...
void | color2 (unsigned a)
| For back compatibility only. More...
int | contains (const Fl_Widget *w) const
| Checks if w is a child of this widget. More...
void | copy_label (const char *new_label)
| Sets the current label. More...
void | copy_tooltip (const char *text)
| Sets the current tooltip text. More...
uchar | damage () const
| Returns non-zero if draw() needs to be called. More...
void | damage (uchar c)
| Sets the damage bits for the widget. More...
void | damage (uchar c, int x, int y, int w, int h)
| Sets the damage bits for an area inside the widget. More...
int | damage_resize (int, int, int, int)
| Internal use only. More...
void | deactivate ()
| Deactivates the widget. More...
Fl_Image * | deimage ()
| Gets the image that is used as part of the widget label. More...
const Fl_Image * | deimage () const
void | deimage (Fl_Image *img)
| Sets the image to use as part of the widget label. More...
void | deimage (Fl_Image &img)
| Sets the image to use as part of the widget label. More...
void | do_callback ()
| Calls the widget callback. More...
void | do_callback (Fl_Widget *o, long arg)
| Calls the widget callback. More...
void | do_callback (Fl_Widget *o, void *arg=0)
| Calls the widget callback. More...
void | draw_label (int, int, int, int, Fl_Align) const
| Draws the label in an arbitrary bounding box with an arbitrary alignment. More...
int | h () const
| Gets the widget height. More...
virtual void | hide ()
| Makes a widget invisible. More...
Fl_Image * | image ()
| Gets the image that is used as part of the widget label. More...
const Fl_Image * | image () const
void | image (Fl_Image *img)
| Sets the image to use as part of the widget label. More...
void | image (Fl_Image &img)
| Sets the image to use as part of the widget label. More...
int | inside (const Fl_Widget *wgt) const
| Checks if this widget is a child of `wgt`. More...
const char * | label () const
| Gets the current label text. More...
void | label (const char *text)
| Sets the current label pointer. More...
void | label (Fl_Labeltype a, const char *b)
| Shortcut to set the label text and type in one call. More...
Fl_Color | labelcolor () const
| Gets the label color. More...
void | labelcolor (Fl_Color c)
| Sets the label color. More...
Fl_Font | labelfont () const
| Gets the font to use. More...
void | labelfont (Fl_Font f)
| Sets the font to use. More...
Fl_Fontsize | labelsize () const
| Gets the font size in pixels. More...
void | labelsize (Fl_Fontsize pix)
| Sets the font size in pixels. More...
Fl_Labeltype | labeltype () const
| Gets the label type. More...
void | labeltype (Fl_Labeltype a)
| Sets the label type. More...
void | measure_label (int &ww, int &hh) const
| Sets width ww and height hh accordingly with the label size. More...
unsigned int | output () const
| Returns if a widget is used for output only. More...
Fl_Group * | parent () const
| Returns a pointer to the parent widget. More...
void | parent (Fl_Group *p)
| Internal use only - "for hacks only". More...
void | position (int X, int Y)
| Repositions the window or widget. More...
void | redraw ()
| Schedules the drawing of the widget. More...
void | redraw_label ()
| Schedules the drawing of the label. More...
Fl_Color | selection_color () const
| Gets the selection color. More...
void | selection_color (Fl_Color a)
| Sets the selection color. More...
void | set_changed ()
| Marks the value of the widget as changed. More...
void | set_output ()
| Sets a widget to output only. More...
void | set_visible ()
| Makes the widget visible. More...
void | set_visible_focus ()
| Enables keyboard focus navigation with this widget. More...
virtual void | show ()
| Makes a widget visible. More...
void | size (int W, int H)
| Changes the size of the widget. More...
int | take_focus ()
| Gives the widget the keyboard focus. More...
unsigned int | takesevents () const
| Returns if the widget is able to take events. More...
int | test_shortcut ()
| Returns true if the widget's label contains the entered '&x' shortcut. More...
const char * | tooltip () const
| Gets the current tooltip text. More...
void | tooltip (const char *text)
| Sets the current tooltip text. More...
uchar | type () const
| Gets the widget type. More...
void | type (uchar t)
| Sets the widget type. More...
int | use_accents_menu ()
| Returns non zero if MAC_USE_ACCENTS_MENU flag is set, 0 otherwise.
void * | user_data () const
| Gets the user data for this widget. More...
void | user_data (void *v)
| Sets the user data for this widget. More...
unsigned int | visible () const
| Returns whether a widget is visible. More...
void | visible_focus (int v)
| Modifies keyboard focus navigation. More...
unsigned int | visible_focus ()
| Checks whether this widget has a visible focus. More...
int | visible_r () const
| Returns whether a widget and all its parents are visible. More...
int | w () const
| Gets the widget width. More...
Fl_When | when () const
| Returns the conditions under which the callback is called. More...
void | when (uchar i)
| Sets the flags used to decide when a callback is called. More...
Fl_Window * | window () const
| Returns a pointer to the primary Fl_Window widget. More...
int | x () const
| Gets the widget position in its window. More...
int | y () const
| Gets the widget position in its window. More...
virtual | ~Fl_Widget ()
| Destroys the widget. More...

## Protected Types

enum | ResizeFlag { RESIZE_NONE = 0, RESIZE_COL_LEFT = 1, RESIZE_COL_RIGHT = 2, RESIZE_ROW_ABOVE = 3, RESIZE_ROW_BELOW = 4 }

## Protected Member Functions

void | change_cursor (Fl_Cursor newcursor)
long | col_scroll_position (int col)
TableContext | cursor2rowcol (int &R, int &C, ResizeFlag &resizeflag)
void | damage_zone (int r1, int c1, int r2, int c2, int r3=0, int c3=0)
virtual void | draw_cell (TableContext context, int R=0, int C=0, int X=0, int Y=0, int W=0, int H=0)
| Subclass should override this method to handle drawing the cells. More...
int | find_cell (TableContext context, int R, int C, int &X, int &Y, int &W, int &H)
void | get_bounds (TableContext context, int &X, int &Y, int &W, int &H)
int | handle (int e)
| Handles the specified event. More...
int | is_fltk_container ()
void | recalc_dimensions ()
void | redraw_range (int topRow, int botRow, int leftCol, int rightCol)
int | row_col_clamp (TableContext context, int &R, int &C)
long | row_scroll_position (int row)
void | table_resized ()
void | table_scrolled ()
Protected Member Functions inherited from Fl_Group
void | draw_child (Fl_Widget &widget) const
| Forces a child to redraw. More...
void | draw_children ()
| Draws all children of the group. More...
void | draw_outside_label (const Fl_Widget &widget) const
| Parents normally call this to draw outside labels of child widgets. More...
int * | sizes ()
| Returns the internal array of widget sizes and positions. More...
void | update_child (Fl_Widget &widget) const
| Draws a child only if it needs it. More...
Protected Member Functions inherited from Fl_Widget
void | clear_flag (unsigned int c)
| Clears a flag in the flags mask.
void | draw_backdrop () const
| If FL_ALIGN_IMAGE_BACKDROP is set, the image or deimage will be drawn.
void | draw_box () const
| Draws the widget box according its box style.
void | draw_box (Fl_Boxtype t, Fl_Color c) const
| Draws a box of type t, of color c at the widget's position and size. More...
void | draw_box (Fl_Boxtype t, int x, int y, int w, int h, Fl_Color c) const
| Draws a box of type t, of color c at the position X,Y and size W,H. More...
void | draw_focus ()
| draws a focus rectangle around the widget
void | draw_focus (Fl_Boxtype t, int x, int y, int w, int h) const
| Draws a focus box for the widget at the given position and size.
void | draw_label () const
| Draws the widget's label at the defined label position. More...
void | draw_label (int, int, int, int) const
| Draws the label in an arbitrary bounding box. More...
| Fl_Widget (int x, int y, int w, int h, const char *label=0L)
| Creates a widget at the given position and size. More...
unsigned int | flags () const
| Gets the widget flags mask.
void | h (int v)
| Internal use only. More...
void | set_flag (unsigned int c)
| Sets a flag in the flags mask.
void | w (int v)
| Internal use only. More...
void | x (int v)
| Internal use only. More...
void | y (int v)
| Internal use only. More...

## Static Protected Member Functions

static void | scroll_cb (Fl_Widget *, void *)

## Protected Attributes

int | botrow
int | current_col
int | current_row
Fl_Scrollbar * | hscrollbar
int | leftcol
int | leftcol_scrollpos
int | rightcol
int | select_col
int | select_row
Fl_Scroll * | table
int | table_h
int | table_w
int | tih
int | tiw
int | tix
int | tiy
int | toh
int | toprow
int | toprow_scrollpos
int | tow
int | tox
int | toy
Fl_Scrollbar * | vscrollbar
int | wih
int | wiw
int | wix
int | wiy

## Additional Inherited Members

Static Public Member Functions inherited from Fl_Group
static Fl_Group * | current ()
| Returns the currently active group. More...
static void | current (Fl_Group *g)
| Sets the current group. More...

## Detailed Description

A table of widgets or other content.

This is the base class for table widgets.

To be useful it must be subclassed and several virtual functions defined. Normally applications use widgets derived from this widget, and do not use this widget directly; this widget is usually too low level to be used directly by applications.

This widget does not handle the data in the table. The draw_cell() method must be overridden by a subclass to manage drawing the contents of the cells.

This widget can be used in several ways:

- As a custom widget; see examples/table-simple.cxx and test/table.cxx. Very optimal for even extremely large tables.
- As a table made up of a single FLTK widget instanced all over the table, simulating a numeric spreadsheet. See examples/table-spreadsheet.cxx and examples/table-spreadsheet-with-keyboard-nav.cxx. Optimal for large tables.
- As a regular container of FLTK widgets, one widget per cell. See examples/table-as-container.cxx. Not recommended for large tables.

When acting as part of a custom widget, events on the cells and/or headings generate callbacks when they are clicked by the user. You control when events are generated based on the setting for Fl_Table::when().

When acting as a container for FLTK widgets, the FLTK widgets maintain themselves. Although the draw_cell() method must be overridden, its contents can be very simple. See the draw_cell() code in examples/table-simple.cxx.

The following variables are available to classes deriving from Fl_Table:

x()/y()/w()/h() | Fl_Table widget's outer dimension. The outer edge of the border of the Fl_Table. (Red in the diagram above)
wix/wiy/wiw/wih | Fl_Table widget's inner dimension. The inner edge of the border of the Fl_Table. eg. if the Fl_Table's box() is FL_NO_BOX, these values are the same as x()/y()/w()/h(). (Yellow in the diagram above)
tox/toy/tow/toh | The table's outer dimension. The outer edge of the border around the cells, but inside the row/col headings and scrollbars. (Green in the diagram above)
tix/tiy/tiw/tih | The table's inner dimension. The inner edge of the border around the cells, but inside the row/col headings and scrollbars. AKA the table's clip region. eg. if the table_box() is FL_NO_BOX, these values are the same as tox/toyy/tow/toh. (Blue in the diagram above)

CORE DEVELOPERS

- Greg Ercolano : 12/16/2002 - initial implementation 12/16/02. Fl_Table, Fl_Table_Row, docs.
- Jean-Marc Lienher : 02/22/2004 - added keyboard nav + mouse selection, and ported Fl_Table into fltk-utf8-1.1.4

OTHER CONTRIBUTORS

- Inspired by the Feb 2000 version of FLVW's Flvw_Table widget. Mucho thanks to those folks.
- Mister Satan : 04/07/2003 - MinGW porting mods, and singleinput.cxx; a cool Fl_Input oriented spreadsheet example
- Marek Paliwoda : 01/08/2003 - Porting mods for Borland
- Ori Berger : 03/16/2006 - Optimizations for >500k rows/cols

LICENSE

Greg added the following license to the original distribution of Fl_Table. He kindly gave his permission to integrate Fl_Table and Fl_Table_Row into FLTK, allowing FLTK license to apply while his widgets are part of the library.

If used on its own, this is the license that applies:

    Fl_Table License
    December 16, 2002

    The Fl_Table library and included programs are provided under the terms
    of the GNU Library General Public License (LGPL) with the following
    exceptions:

    1. Modifications to the Fl_Table configure script, config
    header file, and makefiles by themselves to support
    a specific platform do not constitute a modified or
    derivative work.

    The authors do request that such modifications be
    contributed to the Fl_Table project - send all
    contributions to "erco at seriss dot com".

    2. Widgets that are subclassed from Fl_Table widgets do not
    constitute a derivative work.

    3. Static linking of applications and widgets to the
    Fl_Table library does not constitute a derivative work
    and does not require the author to provide source
    code for the application or widget, use the shared
    Fl_Table libraries, or link their applications or
    widgets against a user-supplied version of Fl_Table.

    If you link the application or widget to a modified
    version of Fl_Table, then the changes to Fl_Table must be
    provided under the terms of the LGPL in sections
    1, 2, and 4.

    4. You do not have to provide a copy of the Fl_Table license
    with programs that are linked to the Fl_Table library, nor
    do you have to identify the Fl_Table license in your
    program or documentation as required by section 6
    of the LGPL.

    However, programs must still identify their use of Fl_Table.
    The following example statement can be included in user
    documentation to satisfy this requirement:

    [program/widget] is based in part on the work of
    the Fl_Table project http://seriss.com/people/erco/fltk/Fl_Table/

## Member Enumeration Documentation

enum Fl_Table::TableContext

The context bit flags for Fl_Table related callbacks (eg.

draw_cell(), callback(), etc)

Enumerator
CONTEXT_NONE | no known context
CONTEXT_STARTPAGE | before a page is redrawn
CONTEXT_ENDPAGE | after a page is redrawn
CONTEXT_ROW_HEADER | in the row header
CONTEXT_COL_HEADER | in the col header
CONTEXT_CELL | in one of the cells
CONTEXT_TABLE | in a dead zone of table
CONTEXT_RC_RESIZE | column or row being resized

## Constructor & Destructor Documentation

Fl_Table::Fl_Table | ( | int | X,
|  | int | Y,
|  | int | W,
|  | int | H,
|  | const char * | l = `0`
| ) |  |

The constructor for the Fl_Table.

This creates an empty table with no rows or columns, with headers and row/column resize behavior disabled.

Fl_Table::~Fl_Table | ( |  | ) |

The destructor for the Fl_Table.

Destroys the table and its associated widgets.

## Member Function Documentation

void Fl_Table::callback | ( | Fl_Widget * | ,
|  | void * |
| ) |  |

Callbacks will be called depending on the setting of Fl_Widget::when().

Callback functions should use the following functions to determine the context/row/column:

Fl_Table::callback_row() returns current row Fl_Table::callback_col() returns current column Fl_Table::callback_context() returns current table context

callback_row() and callback_col() will be set to the row and column number the event occurred on. If someone clicked on a row header, `col` will be 0. If someone clicked on a column header, `row` will be 0.

callback_context() will return one of the following:

`Fl_Table::CONTEXT_ROW_HEADER` | Someone clicked on a row header. Excludes resizing.
`Fl_Table::CONTEXT_COL_HEADER` | Someone clicked on a column header. Excludes resizing.
`Fl_Table::CONTEXT_CELL` | Someone clicked on a cell. To receive callbacks for FL_RELEASE events, you must set when(FL_WHEN_RELEASE).
`Fl_Table::CONTEXT_RC_RESIZE` | Someone is resizing rows/columns either interactively, or via the col_width() or row_height() API. Use is_interactive_resize() to determine interactive resizing. If resizing a column, R=0 and C=column being resized. If resizing a row, C=0 and R=row being resized. NOTE: To receive resize events, you must set when(FL_WHEN_CHANGED).

class MyTable : public Fl_Table {
[..]
private:
// Handle events that happen on the table
void event_callback2() {
int R = callback_row(), // row where event occurred
C = callback_col(); // column where event occurred
TableContext context = callback_context(); // which part of table
fprintf(stderr, "callback: Row=%d Col=%d Context=%d Event=%d\n",
R, C, (int)context, (int)Fl::event());
}
// Actual static callback
static void event_callback(Fl_Widget*, void* data) {
MyTable *o = (MyTable*)data;
o-&gt;event_callback2();
}
public:
// Constructor
MyTable() {
[..]
table.callback(&event_callback, (void*)this); // setup callback
table.when(FL_WHEN_CHANGED|FL_WHEN_RELEASE); // when to call it
}
};

int Fl_Table::callback_col | ( |  | ) |

inline

Returns the current column the event occurred on.

This function should only be used from within the user's callback function

TableContext Fl_Table::callback_context | ( |  | ) |

inline

Returns the current 'table context'.

This function should only be used from within the user's callback function

int Fl_Table::callback_row | ( |  | ) |

inline

Returns the current row the event occurred on.

This function should only be used from within the user's callback function

Fl_Widget* Fl_Table::child | ( | int | n | ) | const

inline

Returns the child widget by an index.

When using the Fl_Table as a container for FLTK widgets, this method returns the widget pointer from the internal array of widgets in the container.

Typically used in loops, eg:

for ( int i=0; i<children(); i++ ) {
Fl_Widget *w = child(i);
[..]
}

int Fl_Table::children | ( |  | ) | const

inline

Returns the number of children in the table.

When using the Fl_Table as a container for FLTK widgets, this method returns how many child widgets the table has.

See Also
  child(int)

virtual void Fl_Table::clear | ( |  | ) |

inlinevirtual

Clears the table to zero rows (rows(0)), zero columns (cols(0)), and clears any widgets (table->clear()) that were added with begin()/end() or add()/insert()/etc.

See Also
  rows(int), cols(int)

Reimplemented in Fl_Table_Row.

void Fl_Table::col_header | ( | int | flag | ) |

inline

Enable or disable column headers.

If changed, the table is redrawn.

void Fl_Table::col_resize | ( | int | flag | ) |

inline

Allows/disallows column resizing by the user.

1=allow interactive resizing, 0=disallow interactive resizing. Since interactive resizing is done via the column headers, `col_header()` must also be enabled to allow resizing.

int Fl_Table::col_resize_min | ( |  | ) |

inline

Sets the current column minimum resize value.

This is used to prevent the user from interactively resizing any column to be smaller than 'pixels'. Must be a value >=1.

void Fl_Table::col_width | ( | int | col,
|  | int | width
| ) |  |

Sets the width of the specified column in pixels, and the table is redrawn.

callback() will be invoked with CONTEXT_RC_RESIZE if the column's width was actually changed, and when() is FL_WHEN_CHANGED.

void Fl_Table::col_width_all | ( | int | width | ) |

inline

Convenience method to set the width of all columns to the same value, in pixels.

The screen is redrawn.

void Fl_Table::draw | ( | void |  | ) |

virtual

Draws the widget.

Never call this function directly. FLTK will schedule redrawing whenever needed. If your widget must be redrawn as soon as possible, call redraw() instead.

Override this function to draw your own widgets.

If you ever need to call another widget's draw method from within your own draw() method, e.g. for an embedded scrollbar, you can do it (because draw() is virtual) like this:

Fl_Widget *s = &scroll; // scroll is an embedded Fl_Scrollbar
s->draw(); // calls Fl_Scrollbar::draw()

Reimplemented from Fl_Group.

virtual void Fl_Table::draw_cell | ( | TableContext | context,
|  | int | R = `0`,
|  | int | C = `0`,
|  | int | X = `0`,
|  | int | Y = `0`,
|  | int | W = `0`,
|  | int | H = `0`
| ) |  |

inlineprotectedvirtual

Subclass should override this method to handle drawing the cells.

This method will be called whenever the table is redrawn, once per cell.

Only cells that are completely (or partially) visible will be told to draw.

`context` will be one of the following:

`Fl_Table::CONTEXT_STARTPAGE` | When table, or parts of the table, are about to be redrawn. Use to initialize static data, such as font selections. R/C will be zero, X/Y/W/H will be the dimensions of the table's entire data area. (Useful for locking a database before accessing; see also visible_cells())
`Fl_Table::CONTEXT_ENDPAGE` | When table has completed being redrawn. R/C will be zero, X/Y/W/H dimensions of table's data area. (Useful for unlocking a database after accessing)
`Fl_Table::CONTEXT_ROW_HEADER` | Whenever a row header cell needs to be drawn. R will be the row number of the header being redrawn, C will be zero, X/Y/W/H will be the fltk drawing area of the row header in the window
`Fl_Table::CONTEXT_COL_HEADER` | Whenever a column header cell needs to be drawn. R will be zero, C will be the column number of the header being redrawn, X/Y/W/H will be the fltk drawing area of the column header in the window
`Fl_Table::CONTEXT_CELL` | Whenever a data cell in the table needs to be drawn. R/C will be the row/column of the cell to be drawn, X/Y/W/H will be the fltk drawing area of the cell in the window
`Fl_Table::CONTEXT_RC_RESIZE` | Whenever table or row/column is resized or scrolled, either interactively or via col_width() or row_height(). R/C/X/Y/W/H will all be zero. Useful for fltk containers that need to resize or move the child fltk widgets.

`row` and `col` will be set to the row and column number of the cell being drawn. In the case of row headers, `col` will be 0. In the case of column headers, `row` will be 0.

`x/y/w/h` will be the position and dimensions of where the cell should be drawn.

In the case of custom widgets, a minimal draw_cell() override might look like the following. With custom widgets it is up to the caller to handle drawing everything within the dimensions of the cell, including handling the selection color. Note all clipping must be handled as well; this allows drawing outside the dimensions of the cell if so desired for 'custom effects'.

// This is called whenever Fl_Table wants you to draw a cell
void MyTable::draw_cell(TableContext context, int R=0, int C=0, int X=0, int Y=0, int W=0, int H=0) {
static char s[40];
sprintf(s, "%d/%d", R, C); // text for each cell
switch ( context ) {
case CONTEXT_STARTPAGE: // Fl_Table telling us its starting to draw page
fl_font(FL_HELVETICA, 16);
return;
case CONTEXT_ROW_HEADER: // Fl_Table telling us it's draw row/col headers
case CONTEXT_COL_HEADER:
fl_push_clip(X, Y, W, H);
{
fl_draw_box(FL_THIN_UP_BOX, X, Y, W, H, color());
fl_color(FL_BLACK);
fl_draw(s, X, Y, W, H, FL_ALIGN_CENTER);
}
fl_pop_clip();
return;
case CONTEXT_CELL: // Fl_Table telling us to draw cells
fl_push_clip(X, Y, W, H);
{
// BG COLOR
fl_color( row_selected(R) ? selection_color() : FL_WHITE);
fl_rectf(X, Y, W, H);
// TEXT
fl_color(FL_BLACK);
fl_draw(s, X, Y, W, H, FL_ALIGN_CENTER);
// BORDER
fl_color(FL_LIGHT2);
fl_rect(X, Y, W, H);
}
fl_pop_clip();
return;
default:
return;
}
//NOTREACHED
}

void Fl_Table::get_selection | ( | int & | row_top,
|  | int & | col_left,
|  | int & | row_bot,
|  | int & | col_right
| ) |  |

Gets the region of cells selected (highlighted).

Parameters

  [in] | row_top | Returns the top row of selection area
  [in] | col_left | Returns the left column of selection area
  [in] | row_bot | Returns the bottom row of selection area
  [in] | col_right | Returns the right column of selection area

int Fl_Table::handle | ( | int | event | ) |

protectedvirtual

Handles the specified event.

You normally don't call this method directly, but instead let FLTK do it when the user interacts with the widget.

When implemented in a widget, this function must return 0 if the widget does not use the event or 1 otherwise.

Most of the time, you want to call the inherited handle() method in your overridden method so that you don't short-circuit events that you don't handle. In this last case you should return the callee retval.

Parameters

  [in] | event | the kind of event received

Return values

  0 | if the event was not used or understood
  1 | if the event was used and can be deleted

See Also
  Fl_Event

Reimplemented from Fl_Group.

Reimplemented in Fl_Table_Row.

int Fl_Table::is_interactive_resize | ( |  | ) |

inline

Returns 1 if someone is interactively resizing a row or column.

You can currently call this only from within your callback().

int Fl_Table::is_selected | ( | int | r,
|  | int | c
| ) |  |

See if the cell at row `r` and column `c` is selected.

Returns
  1 if the cell is selected, 0 if not.

void Fl_Table::row_header | ( | int | flag | ) |

inline

Enables/disables showing the row headers.

1=enabled, 0=disabled. If changed, the table is redrawn.

void Fl_Table::row_height | ( | int | row,
|  | int | height
| ) |  |

Sets the height of the specified row in pixels, and the table is redrawn.

callback() will be invoked with CONTEXT_RC_RESIZE if the row's height was actually changed, and when() is FL_WHEN_CHANGED.

void Fl_Table::row_height_all | ( | int | height | ) |

inline

Convenience method to set the height of all rows to the same value, in pixels.

The screen is redrawn.

void Fl_Table::row_resize | ( | int | flag | ) |

inline

Allows/disallows row resizing by the user.

1=allow interactive resizing, 0=disallow interactive resizing. Since interactive resizing is done via the row headers, row_header() must also be enabled to allow resizing.

void Fl_Table::row_resize_min | ( | int | val | ) |

inline

Sets the current row minimum resize value.

This is used to prevent the user from interactively resizing any row to be smaller than 'pixels'. Must be a value >=1.

void Fl_Table::set_selection | ( | int | row_top,
|  | int | col_left,
|  | int | row_bot,
|  | int | col_right
| ) |  |

Sets the region of cells to be selected (highlighted).

So for instance, set_selection(0,0,0,0) selects the top/left cell in the table. And set_selection(0,0,1,1) selects the four cells in rows 0 and 1, column 0 and 1.

Parameters

  [in] | row_top | Top row of selection area
  [in] | col_left | Left column of selection area
  [in] | row_bot | Bottom row of selection area
  [in] | col_right | Right column of selection area

void Fl_Table::table_box | ( | Fl_Boxtype | val | ) |

inline

Sets the kind of box drawn around the data table, the default being FL_NO_BOX.

Changing this value will cause the table to redraw.

void Fl_Table::top_row | ( | int | row | ) |

inline

Sets which row should be at the top of the table, scrolling as necessary, and the table is redrawn.

If the table cannot be scrolled that far, it is scrolled as far as possible.

int Fl_Table::top_row | ( |  | ) |

inline

Returns the current top row shown in the table.

This row may be partially obscured.

void Fl_Table::visible_cells | ( | int & | r1,
|  | int & | r2,
|  | int & | c1,
|  | int & | c2
| ) |  |

inline

Returns the range of row and column numbers for all visible and partially visible cells in the table.

These values can be used e.g. by your draw_cell() routine during CONTEXT_STARTPAGE to figure out what cells are about to be redrawn for the purposes of locking the data from a database before it's drawn.

leftcol rightcol
: :
toprow .. .-------------------.
| |
| V I S I B L E |
| |
| T A B L E |
| |
botrow .. '-------------------`

e.g. in a table where the visible rows are 5-20, and the visible columns are 100-120, then those variables would be:

- toprow = 5
- botrow = 20
- leftcol = 100
- rightcol = 120

void Fl_Table::when | ( | Fl_When | flags | ) |

The Fl_Widget::when() function is used to set a group of flags, determining when the widget callback is called:

`FL_WHEN_CHANGED` | callback() will be called when rows or columns are resized (interactively or via col_width() or row_height()), passing CONTEXT_RC_RESIZE via callback_context().
`FL_WHEN_RELEASE` | callback() will be called during FL_RELEASE events, such as when someone releases a mouse button somewhere on the table.

The callback() routine is sent a TableContext that indicates the context the event occurred in, such as in a cell, in a header, or elsewhere on the table. When an event occurs in a cell or header, callback_row() and callback_col() can be used to determine the row and column. The callback can also look at the regular fltk event values (ie. Fl::event() and Fl::button()) to determine what kind of event is occurring.

The documentation for this class was generated from the following files:

- Fl_Table.H
- Fl_Table.cxx

- © 1998-2012 by Bill Spitzak and others.