class Fl_Input


class Fl_Input -- text input widget

Class Hierarchy

           +----Fl_Float_Input, Fl_Int_Input,
                Fl_Multiline_Input, Fl_Secret_Input

Include Files

#include <FL/Fl_Input.H>


This is the FLTK text input widget. It displays a single line of text and lets the user edit it. Normally it is drawn with an inset box and a white background. The text may contain any characters (even 0), and will correctly display anything, using ^X notation for unprintable control characters and \nnn notation for unprintable characters with the high bit set. It assummes the font can draw any characters in the ISO8859-1 character set.

Mouse button 1Moves the cursor to this point. Drag selects characters. Double click selects words. Triple click selects all text. Shift+click extends the selection.
Mouse button 2Insert the current X selection at the cursor (unlike Motif this does not move the insertion point to the mouse). If the widget does not have the input focus (and thus no cursor) it puts the cursor where clicked and inserts the selection there.
Mouse button 3Currently acts like button 1.
BackspaceDeletes one character to the left, or deletes the selected region.
EnterMay cause the callback, see when().
^A or HomeGo to start of line.
^B or LeftMove left
^CCopy the selection to the clipboard
^D or DeleteDeletes one character to the right or deletes the selected region. Due to silly historical X problems, the Delete key will act like Backspace until you type a "real" backspace.
^E or EndGo to the end of line.
^F or RightMove right
^KDelete to the end of line (next \n character) or deletes a single \n character. These deletions are all concatenated into the clipboard.
^N or DownMove down (for Fl_Multiline_Input only, otherwise it moves to the next input field).
^P or UpMove up (for Fl_Multiline_Input only, otherwise it moves to the previous input field).
^Q or RightCtrl or ComposeStart a compose-character sequence. The next one or two keys typed define the character to insert. This also can be used to "quote" control characters.
^UDelete everything.
^V or ^YPaste the clipboard
^X or ^WCopy the region to the clipboard and delete it.
^Z or ^_Undo. This is a single-level undo mechanism, but all adjacent deletions and insertions are concatenated into a single "undo". Often this will undo a lot more than you expected.
Shift+moveMove the cursor but also extend the selection.


Fl_Input::Fl_Input(int x, int y, int w, int h, const char *label = 0)

Creates a new Fl_Input widget using the given position, size, and label string. The default boxtype is FL_DOWN_BOX.

virtual Fl_Input::~Fl_Input()

Destroys the widget and any value associated with it.

const char *Fl_Input::value() const
int Fl_Input::value(const char*)
int Fl_Input::value(const char*, int)

The first form returns the current value, which is a pointer to the internal buffer and is valid only until the next event is handled.

The second two forms change the text and set the mark and the point to the end of it. The string is copied to the internal buffer. Passing NULL is the same as "". This returns non-zero if the new value is different than the current one. You can use the second version to directly set the length if you know it already or want to put nul's in the text.

int Fl_Input::static_value(const char*)
int Fl_Input::static_value(const char*, int)

Change the text and set the mark and the point to the end of it. The string is not copied. If the user edits the string it is copied to the internal buffer then. This can save a great deal of time and memory if your program is rapidly changing the values of text fields, but this will only work if the passed string remains unchanged until either the Fl_Input is destroyed or value() is called again.

int Fl_Input::size() const

Returns the number of characters in value(). This may be greater than strlen(value()) if there are nul characters in it.

char Fl_Input::index(int) const

Same as value()[n], but may be faster in plausible implementations. No bounds checking is done.

Fl_When Fl_Widget::when() const
void Fl_Widget::when(Fl_When)

Controls when callbacks are done. The following values are useful, the default value is FL_WHEN_RELEASE:

Fl_Color Fl_Input::textcolor() const
void Fl_Input::textcolor(Fl_Color)

Gets or sets the color of the text in the input field.

Fl_Font Fl_Input::textfont() const
void Fl_Input::textfont(Fl_Font)

Gets or sets the font of the text in the input field.

uchar Fl_Input::textsize() const
void Fl_Input::textsize(uchar)

Gets or sets the size of the text in the input field.

Fl_Color Fl_Input::cursor_color() 
void Fl_Input::cursor_color(Fl_Color)

Get or set the color of the cursor. This is black by default.