/**

 \page	enumerations	C - FLTK Enumerations

 \note	This file is not actively maintained any more, but is left
 	here as a reference, until the doxygen documentation is
	completed.
	
 \sa \ref FL/Enumerations.H.

This appendix lists the enumerations provided in the
<FL/Enumerations.H> header file, organized by section.
Constants whose value is zero are marked with "(0)",
this is often useful to know when programming.

\section enumerations_versions Version Numbers

The FLTK version number is stored in a number of compile-time constants:

\li <tt>FL_MAJOR_VERSION</tt> - The major release number, currently  1. 
\li <tt>FL_MINOR_VERSION</tt> - The minor release number, currently  3. 
\li <tt>FL_PATCH_VERSION</tt> - The patch release number, currently  0. 
\li <tt>FL_VERSION</tt> - A combined floating-point version  number for
    the major, minor, and patch release numbers, currently 1.0300. 

<A NAME="events"> </A> <!-- For old HTML links only ! -->
\section enumerations_events Events

Events are identified by an <tt>Fl_Event</tt> enumeration value.  The
following events are currently defined:

\li <tt>FL_NO_EVENT</tt> - No event (or an event fltk does not
    understand) occurred (0).
\li <tt>FL_PUSH</tt> - A mouse button was pushed. 
\li <tt>FL_RELEASE</tt> - A mouse button was released. 
\li <tt>FL_ENTER</tt> - The mouse pointer entered a widget. 
\li <tt>FL_LEAVE</tt> - The mouse pointer left a widget. 
\li <tt>FL_DRAG</tt> - The mouse pointer was moved with a button pressed. 
\li <tt>FL_FOCUS</tt> - A widget should receive keyboard focus. 
\li <tt>FL_UNFOCUS</tt> - A widget loses keyboard focus. 
\li <tt>FL_KEYBOARD</tt> - A key was pressed. 
\li <tt>FL_CLOSE</tt> - A window was closed. 
\li <tt>FL_MOVE</tt> - The mouse pointer was moved with no buttons pressed. 
\li <tt>FL_SHORTCUT</tt> - The user pressed a shortcut key. 
\li <tt>FL_DEACTIVATE</tt> - The widget has been deactivated. 
\li <tt>FL_ACTIVATE</tt> - The widget has been activated. 
\li <tt>FL_HIDE</tt> - The widget has been hidden. 
\li <tt>FL_SHOW</tt> - The widget has been shown. 
\li <tt>FL_PASTE</tt> - The widget should paste the contents of the
    clipboard. 
\li <tt>FL_SELECTIONCLEAR</tt> - The widget should clear any selections
     made for the clipboard. 
\li <tt>FL_MOUSEWHEEL</tt> - The horizontal or vertical mousewheel was turned. 
\li <tt>FL_DND_ENTER</tt> - The mouse pointer entered a widget dragging data. 
\li <tt>FL_DND_DRAG</tt> - The mouse pointer was moved dragging data. 
\li <tt>FL_DND_LEAVE</tt> - The mouse pointer left a widget still dragging
    data. 
\li <tt>FL_DND_RELEASE</tt> - Dragged data is about to be dropped. 

<a name="when"> </A> <!-- For old HTML links only ! -->
\section enumerations_when Callback "When" Conditions

The following constants determine when a callback is performed:

\li <tt>FL_WHEN_NEVER</tt> - Never call the callback (0). 
\li <tt>FL_WHEN_CHANGED</tt> - Do the callback only when the  widget
    value changes. 
\li <tt>FL_WHEN_NOT_CHANGED</tt> - Do the callback whenever the  user
    interacts with the widget. 
\li <tt>FL_WHEN_RELEASE</tt> - Do the callback when the button or  key
    is released and the value changes. 
\li <tt>FL_WHEN_ENTER_KEY</tt> - Do the callback when the user presses
    the ENTER key and the value changes. 
\li <tt>FL_WHEN_RELEASE_ALWAYS</tt> - Do the callback when the button
    or key is released, even if the value doesn't change. 
\li <tt>FL_WHEN_ENTER_KEY_ALWAYS</tt> - Do the callback when the user
    presses the ENTER key, even if the value doesn't change. 

<A NAME="button_values"> </A> <!-- For old HTML links only ! -->
\section enumeration_button_values Fl::event_button() Values

The following constants define the button numbers for <tt>FL_PUSH</tt> and
<tt>FL_RELEASE</tt> events:

\li <tt>FL_LEFT_MOUSE</tt> - the left mouse button
\li <tt>FL_MIDDLE_MOUSE</tt> - the middle mouse button
\li <tt>FL_RIGHT_MOUSE</tt> - the right mouse button

<A NAME="key_values"> </A> <!-- For old HTML links only ! -->
\section enumerations_event_key Fl::event_key() Values

The following constants define the non-ASCII keys on the keyboard for <tt>
FL_KEYBOARD</tt> and <tt>FL_SHORTCUT</tt> events:

\li <tt>FL_Button</tt> - A mouse button; use <tt>Fl_Button +  n</tt>
    for mouse button <tt>n</tt>. 
\li <tt>FL_BackSpace</tt> - The backspace key. 
\li <tt>FL_Tab</tt> - The tab key. 
\li <tt>FL_Enter</tt> - The enter key. 
\li <tt>FL_Pause</tt> - The pause key. 
\li <tt>FL_Scroll_Lock</tt> - The scroll lock key. 
\li <tt>FL_Escape</tt> - The escape key. 
\li <tt>FL_Home</tt> - The home key. 
\li <tt>FL_Left</tt> - The left arrow key. 
\li <tt>FL_Up</tt> - The up arrow key. 
\li <tt>FL_Right</tt> - The right arrow key. 
\li <tt>FL_Down</tt> - The down arrow key. 
\li <tt>FL_Page_Up</tt> - The page-up key. 
\li <tt>FL_Page_Down</tt> - The page-down key. 
\li <tt>FL_End</tt> - The end key. 
\li <tt>FL_Print</tt> - The print (or print-screen) key. 
\li <tt>FL_Insert</tt> - The insert key. 
\li <tt>FL_Menu</tt> - The menu key. 
\li <tt>FL_Num_Lock</tt> - The num lock key. 
\li <tt>FL_KP</tt> - One of the keypad numbers; use <tt>FL_KP +  n</tt>
    for number <tt>n</tt>. 
\li <tt>FL_KP_Enter</tt> - The enter key on the keypad. 
\li <tt>FL_F</tt> - One of the function keys; use <tt>FL_F +  n</tt>
    for function key <tt>n</tt>. 
\li <tt>FL_Shift_L</tt> - The lefthand shift key. 
\li <tt>FL_Shift_R</tt> - The righthand shift key. 
\li <tt>FL_Control_L</tt> - The lefthand control key. 
\li <tt>FL_Control_R</tt> - The righthand control key. 
\li <tt>FL_Caps_Lock</tt> - The caps lock key. 
\li <tt>FL_Meta_L</tt> - The left meta/Windows key. 
\li <tt>FL_Meta_R</tt> - The right meta/Windows key. 
\li <tt>FL_Alt_L</tt> - The left alt key. 
\li <tt>FL_Alt_R</tt> - The right alt key. 
\li <tt>FL_Delete</tt> - The delete key. 

\section enumerations_event_state Fl::event_state() Values

The following constants define bits in the <tt>Fl::event_state()</tt>
value:

\li <tt>FL_SHIFT</tt> - One of the shift keys is down. 
\li <tt>FL_CAPS_LOCK</tt> - The caps lock is on. 
\li <tt>FL_CTRL</tt> - One of the ctrl keys is down. 
\li <tt>FL_ALT</tt> - One of the alt keys is down. 
\li <tt>FL_NUM_LOCK</tt> - The num lock is on. 
\li <tt>FL_META</tt> - One of the meta/Windows keys is down. 
\li <tt>FL_COMMAND</tt> - An alias for <tt>FL_CTRL</tt> on WIN32 and X11,
    or <tt>FL_META</tt> on MacOS X. 
\li <tt>FL_SCROLL_LOCK</tt> - The scroll lock is on. 
\li <tt>FL_BUTTON1</tt> - Mouse button 1 is pushed. 
\li <tt>FL_BUTTON2</tt> - Mouse button 2 is pushed. 
\li <tt>FL_BUTTON3</tt> - Mouse button 3 is pushed. 
\li <tt>FL_BUTTONS</tt> - Any mouse button is pushed. 
\li <tt>FL_BUTTON(n)</tt> - Mouse button N (N &gt; 0) is pushed. 

<!-- NEED 4in -->

<a name="align"> </A> <!-- For old HTML links only ! -->
\section enumerations_alignment Alignment Values

The following constants define bits that can be used with
<A href=Fl_Widget.html#Fl_Widget.align><tt>Fl_Widget::align()</tt></A>
to control the positioning of the label:

\li <tt>FL_ALIGN_CENTER</tt> - The label is centered (0). 
\li <tt>FL_ALIGN_TOP</tt> - The label is top-aligned. 
\li <tt>FL_ALIGN_BOTTOM</tt> - The label is bottom-aligned. 
\li <tt>FL_ALIGN_LEFT</tt> - The label is left-aligned. 
\li <tt>FL_ALIGN_RIGHT</tt> - The label is right-aligned. 
\li <tt>FL_ALIGN_CLIP</tt> - The label is clipped to the widget. 
\li <tt>FL_ALIGN_WRAP</tt> - The label text is wrapped as needed. 
\li <tt>FL_ALIGN_TOP_LEFT</tt>
\li <tt>FL_ALIGN_TOP_RIGHT</tt>
\li <tt>FL_ALIGN_BOTTOM_LEFT</tt>
\li <tt>FL_ALIGN_BOTTOM_RIGHT</tt>
\li <tt>FL_ALIGN_LEFT_TOP</tt>
\li <tt>FL_ALIGN_RIGHT_TOP</tt>
\li <tt>FL_ALIGN_LEFT_BOTTOM</tt>
\li <tt>FL_ALIGN_RIGHT_BOTTOM</tt>
\li <tt>FL_ALIGN_INSIDE</tt> - 'or' this with other values to put
    label inside the widget. 

<a name="fonts"> </A> <!-- For old HTML links only ! -->
\section enumerations_fonts Fonts

The following constants define the standard FLTK fonts:

\li <tt>FL_HELVETICA</tt> - Helvetica (or Arial) normal (0). 
\li <tt>FL_HELVETICA_BOLD</tt> - Helvetica (or Arial) bold. 
\li <tt>FL_HELVETICA_ITALIC</tt> - Helvetica (or Arial) oblique. 
\li <tt>FL_HELVETICA_BOLD_ITALIC</tt> - Helvetica (or Arial) bold-oblique. 
\li <tt>FL_COURIER</tt> - Courier normal. 
\li <tt>FL_COURIER_BOLD</tt> - Courier bold. 
\li <tt>FL_COURIER_ITALIC</tt> - Courier italic. 
\li <tt>FL_COURIER_BOLD_ITALIC</tt> - Courier bold-italic. 
\li <tt>FL_TIMES</tt> - Times roman. 
\li <tt>FL_TIMES_BOLD</tt> - Times bold. 
\li <tt>FL_TIMES_ITALIC</tt> - Times italic. 
\li <tt>FL_TIMES_BOLD_ITALIC</tt> - Times bold-italic. 
\li <tt>FL_SYMBOL</tt> - Standard symbol font. 
\li <tt>FL_SCREEN</tt> - Default monospaced screen font. 
\li <tt>FL_SCREEN_BOLD</tt> - Default monospaced bold screen font. 
\li <tt>FL_ZAPF_DINGBATS</tt> - Zapf-dingbats font.

<a name="colors"> </A> <!-- For old HTML links only ! -->
\section enumerations_colors Colors

The <tt>Fl_Color</tt> enumeration type holds a FLTK color value.
Colors are either 8-bit indexes into a virtual colormap or 24-bit RGB
color values. Color indices occupy the lower 8 bits of the value, while
RGB colors occupy the upper 24 bits, for a byte organization of RGBI.

\subsection enumerations_color_constants Color Constants

Constants are defined for the user-defined foreground and background
colors, as well as specific colors and the start of the grayscale ramp
and color cube in the virtual colormap. Inline functions are provided to
retrieve specific grayscale, color cube, or RGB color values.

The following color constants can be used to access the user-defined
colors:

\li <tt>FL_BACKGROUND_COLOR</tt> - the default background color
\li <tt>FL_BACKGROUND2_COLOR</tt> - the default
    background color for text, list, and valuator widgets
\li <tt>FL_FOREGROUND_COLOR</tt> - the default
    foreground color (0) used for labels and text
\li <tt>FL_INACTIVE_COLOR</tt> - the inactive foreground color
\li <tt>FL_SELECTION_COLOR</tt> - the default selection/highlight color

The following color constants can be used to access the colors from the
FLTK standard color cube:

\li <tt>FL_BLACK</tt>
\li <tt>FL_BLUE</tt>
\li <tt>FL_CYAN</tt>
\li <tt>FL_DARK_BLUE</tt>
\li <tt>FL_DARK_CYAN</tt>
\li <tt>FL_DARK_GREEN</tt>
\li <tt>FL_DARK_MAGENTA</tt>
\li <tt>FL_DARK_RED</tt>
\li <tt>FL_DARK_YELLOW</tt>
\li <tt>FL_GREEN</tt>
\li <tt>FL_MAGENTA</tt>
\li <tt>FL_RED</tt>
\li <tt>FL_WHITE</tt>
\li <tt>FL_YELLOW</tt>

The inline methods for getting a grayscale, color cube, or
RGB color value are described in
<A HREF="functions.html#functions">Appendix B - Function Reference</A>.

<a name="cursor"> </A> <!-- For old HTML links only ! -->
\section enumerations_cursors Cursors

The following constants define the mouse cursors that are available in
FLTK.  The  double-headed arrows are bitmaps
provided by FLTK on X, the others are provided by system-defined
cursors.


\li <tt>FL_CURSOR_DEFAULT</tt> - the default cursor, usually an arrow (0)
\li <tt>FL_CURSOR_ARROW</tt> - an arrow pointer 
\li <tt>FL_CURSOR_CROSS</tt> - crosshair 
\li <tt>FL_CURSOR_WAIT</tt> - watch or hourglass 
\li <tt>FL_CURSOR_INSERT</tt> - I-beam 
\li <tt>FL_CURSOR_HAND</tt> - hand (uparrow on MSWindows) 
\li <tt>FL_CURSOR_HELP</tt> - question mark 
\li <tt>FL_CURSOR_MOVE</tt> - 4-pointed arrow 
\li <tt>FL_CURSOR_NS</tt> - up/down arrow 
\li <tt>FL_CURSOR_WE</tt> - left/right arrow 
\li <tt>FL_CURSOR_NWSE</tt> - diagonal arrow 
\li <tt>FL_CURSOR_NESW</tt> - diagonal arrow 
\li <tt>FL_CURSOR_NONE</tt> - invisible 

\section enumerations_file_when FD "When" Conditions

\li <tt>FL_READ</tt> - Call the callback when there is data to be
    read.
\li <tt>FL_WRITE</tt> - Call the callback when data can be written
    without blocking.
\li <tt>FL_EXCEPT</tt> - Call the callback if an exception occurs on
    the file.

<a name="damage"> </A> <!-- For old HTML links only ! -->
\section enumerations_damage Damage Masks

The following damage mask bits are used by the standard FLTK widgets:

\li <tt>FL_DAMAGE_CHILD</tt> - A child needs to be redrawn. 
\li <tt>FL_DAMAGE_EXPOSE</tt> - The window was exposed. 
\li <tt>FL_DAMAGE_SCROLL</tt> - The <tt>Fl_Scroll</tt> widget was scrolled. 
\li <tt>FL_DAMAGE_OVERLAY</tt> - The overlay planes need to be redrawn. 
\li <tt>FL_DAMAGE_USER1</tt> - First user-defined damage bit. 
\li <tt>FL_DAMAGE_USER2</tt> - Second user-defined damage bit. 
\li <tt>FL_DAMAGE_ALL</tt> - Everything needs to be redrawn. 

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