FLTK 1.4.4

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Fl_Valuator Class Reference

The Fl_Valuator class controls a single floating-point value and provides a consistent interface to set the value, range, and step, and insures that callbacks are done the same for every object. More...

`#include <Fl_Valuator.H>`

Inheritance diagram for Fl_Valuator:

## Public Member Functions
void | bounds (double a, double b)
| Sets the minimum (a) and maximum (b) values for the valuator widget.
double | clamp (double)
| Clamps the passed value to the valuator range.
virtual int | format (char *)
| Uses internal rules to format the fields numerical value into the character array pointed to by the passed parameter.
double | increment (double, int)
| Adds n times the step value to the passed value.
double | maximum () const
| Gets the maximum value for the valuator.
void | maximum (double a)
| Sets the maximum value for the valuator.
double | minimum () const
| Gets the minimum value for the valuator.
void | minimum (double a)
| Sets the minimum value for the valuator.
void | precision (int digits)
| Sets the step value to 1.0 / 10digits.
void | range (double a, double b)
| Sets the minimum and maximum values for the valuator.
double | round (double)
| Round the passed value to the nearest step increment.
double | step () const
| Gets or sets the step value.
void | step (double a, int b)
| See double Fl_Valuator::step() const.
void | step (double s)
| See double Fl_Valuator::step() const.
void | step (int a)
| See double Fl_Valuator::step() const.
double | value () const
| Gets the floating point(double) value.
int | value (double)
| Sets the current value.
| ~Fl_Valuator () FL_OVERRIDE
| Destructor is accessible despite protected constructor.
Public Member Functions inherited from Fl_Widget
void | _clear_fullscreen ()
void | _set_fullscreen ()
void | activate ()
| Activates the widget.
unsigned int | active () const
| Returns whether the widget is active.
int | active_r () const
| Returns whether the widget and all of its parents are active.
Fl_Align | align () const
| Gets the label alignment.
void | align (Fl_Align alignment)
| Sets the label alignment.
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.
virtual class Fl_Gl_Window * | as_gl_window ()
| Returns an Fl_Gl_Window pointer if this widget is an Fl_Gl_Window.
virtual class Fl_Gl_Window const * | as_gl_window () const
virtual Fl_Group * | as_group ()
| Returns an Fl_Group pointer if this widget is an Fl_Group.
virtual Fl_Group const * | as_group () const
virtual Fl_Window * | as_window ()
| Returns an Fl_Window pointer if this widget is an Fl_Window.
virtual Fl_Window const * | as_window () const
void | bind_deimage (Fl_Image *img)
| Sets the image to use as part of the widget label when in the inactive state.
void | bind_deimage (int f)
| Bind the inactive image to the widget, so the widget will delete the image when it is no longer needed.
void | bind_image (Fl_Image *img)
| Sets the image to use as part of the widget label when in the active state.
void | bind_image (int f)
| Bind the image to the widget, so the widget will delete the image when it is no longer needed.
Fl_Boxtype | box () const
| Gets the box type of the widget.
void | box (Fl_Boxtype new_box)
| Sets the box type for the widget.
Fl_Callback_p | callback () const
| Gets the current callback function for the widget.
void | callback (Fl_Callback *cb)
| Sets the current callback function for the widget.
void | callback (Fl_Callback *cb, Fl_Callback_User_Data *p, bool auto_free)
| Sets the current callback function and managed user data for the widget.
void | callback (Fl_Callback *cb, void *p)
| Sets the current callback function and data for the widget.
void | callback (Fl_Callback0 *cb)
| Sets the current callback function for the widget.
void | callback (Fl_Callback1 *cb, long p=0)
| Sets the current callback function for the widget.
unsigned int | changed () const
| Checks if the widget value changed since the last callback.
void | clear_active ()
| Marks the widget as inactive without sending events or changing focus.
void | clear_changed ()
| Marks the value of the widget as unchanged.
void | clear_damage (uchar c=0)
| Clears or sets the damage flags.
void | clear_output ()
| Sets a widget to accept input.
void | clear_visible ()
| Hides the widget.
void | clear_visible_focus ()
| Disables keyboard focus navigation with this widget.
Fl_Color | color () const
| Gets the background color of the widget.
void | color (Fl_Color bg)
| Sets the background color of the widget.
void | color (Fl_Color bg, Fl_Color sel)
| Sets the background and selection color of the widget.
Fl_Color | color2 () const
| For back compatibility only.
void | color2 (unsigned a)
| For back compatibility only.
int | contains (const Fl_Widget *w) const
| Checks if w is a child of this widget.
void | copy_label (const char *new_label)
| Sets the current label.
void | copy_tooltip (const char *text)
| Sets the current tooltip text.
uchar | damage () const
| Returns non-zero if draw() needs to be called.
void | damage (uchar c)
| Sets the damage bits for the widget.
void | damage (uchar c, int x, int y, int w, int h)
| Sets the damage bits for an area inside the widget.
int | damage_resize (int, int, int, int)
| Internal use only.
void | deactivate ()
| Deactivates the widget.
Fl_Image * | deimage ()
| Gets the image that is used as part of the widget label when in the inactive state.
const Fl_Image * | deimage () const
| Gets the image that is used as part of the widget label when in the inactive state.
void | deimage (Fl_Image &img)
| Sets the image to use as part of the widget label when in the inactive state.
void | deimage (Fl_Image *img)
| Sets the image to use as part of the widget label when in the inactive state.
int | deimage_bound () const
| Returns whether the inactive image is managed by the widget.
void | do_callback (Fl_Callback_Reason reason=FL_REASON_UNKNOWN)
| Calls the widget callback function with default arguments.
void | do_callback (Fl_Widget *widget, long arg, Fl_Callback_Reason reason=FL_REASON_UNKNOWN)
| Calls the widget callback function with arbitrary arguments.
void | do_callback (Fl_Widget *widget, void *arg=0, Fl_Callback_Reason reason=FL_REASON_UNKNOWN)
| Calls the widget callback function with arbitrary arguments.
virtual void | draw ()=0
| Draws the widget.
void | draw_label (int, int, int, int, Fl_Align) const
| Draws the label in an arbitrary bounding box with an arbitrary alignment.
int | h () const
| Gets the widget height.
virtual int | handle (int event)
| Handles the specified event.
virtual void | hide ()
| Makes a widget invisible.
int | horizontal_label_margin ()
| Get the spacing between the label and the horizontal edge of the widget.
void | horizontal_label_margin (int px)
| Set the spacing between the label and the horizontal edge of the widget.
Fl_Image * | image ()
| Gets the image that is used as part of the widget label when in the active state.
const Fl_Image * | image () const
| Gets the image that is used as part of the widget label when in the active state.
void | image (Fl_Image &img)
| Sets the image to use as part of the widget label when in the active state.
void | image (Fl_Image *img)
| Sets the image to use as part of the widget label when in the active state.
int | image_bound () const
| Returns whether the image is managed by the widget.
int | inside (const Fl_Widget *wgt) const
| Checks if this widget is a child of `wgt`.
int | is_label_copied () const
| Returns whether the current label was assigned with copy_label().
const char * | label () const
| Gets the current label text.
void | label (const char *text)
| Sets the current label pointer.
void | label (Fl_Labeltype a, const char *b)
| Shortcut to set the label text and type in one call.
int | label_image_spacing ()
| Return the gap size between the label and the image.
void | label_image_spacing (int gap)
| Set the gap between the label and the image in pixels.
Fl_Color | labelcolor () const
| Gets the label color.
void | labelcolor (Fl_Color c)
| Sets the label color.
Fl_Font | labelfont () const
| Gets the font to use.
void | labelfont (Fl_Font f)
| Sets the font to use.
Fl_Fontsize | labelsize () const
| Gets the font size in pixels.
void | labelsize (Fl_Fontsize pix)
| Sets the font size in pixels.
Fl_Labeltype | labeltype () const
| Gets the label type.
void | labeltype (Fl_Labeltype a)
| Sets the label type.
void | measure_label (int &ww, int &hh) const
| Sets width ww and height hh accordingly with the label size.
bool | needs_keyboard () const
| Returns whether this widget needs a keyboard.
void | needs_keyboard (bool needs)
| Sets whether this widget needs a keyboard.
unsigned int | output () const
| Returns if a widget is used for output only.
Fl_Group * | parent () const
| Returns a pointer to the parent widget.
void | parent (Fl_Group *p)
| Internal use only - "for hacks only".
void | position (int X, int Y)
| Repositions the window or widget.
void | redraw ()
| Schedules the drawing of the widget.
void | redraw_label ()
| Schedules the drawing of the label.
virtual void | resize (int x, int y, int w, int h)
| Changes the size or position of the widget.
Fl_Color | selection_color () const
| Gets the selection color.
void | selection_color (Fl_Color a)
| Sets the selection color.
void | set_active ()
| Marks the widget as active without sending events or changing focus.
void | set_changed ()
| Marks the value of the widget as changed.
void | set_output ()
| Sets a widget to output only.
void | set_visible ()
| Makes the widget visible.
void | set_visible_focus ()
| Enables keyboard focus navigation with this widget.
int | shortcut_label () const
| Returns whether the widget's label uses '&' to indicate shortcuts.
void | shortcut_label (int value)
| Sets whether the widget's label uses '&' to indicate shortcuts.
virtual void | show ()
| Makes a widget visible.
void | size (int W, int H)
| Changes the size of the widget.
int | take_focus ()
| Gives the widget the keyboard focus.
unsigned int | takesevents () const
| Returns if the widget is able to take events.
int | test_shortcut ()
| Returns true if the widget's label contains the entered '&x' shortcut.
const char * | tooltip () const
| Gets the current tooltip text.
void | tooltip (const char *text)
| Sets the current tooltip text.
Fl_Window * | top_window () const
| Returns a pointer to the top-level window for the widget.
Fl_Window * | top_window_offset (int &xoff, int &yoff) const
| Finds the x/y offset of the current widget relative to the top-level window.
uchar | type () const
| Gets the widget type.
void | type (uchar t)
| Sets the widget type.
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.
void | user_data (Fl_Callback_User_Data *v, bool auto_free)
| Sets the user data for this widget.
void | user_data (void *v)
| Sets the user data for this widget.
int | vertical_label_margin ()
| Get the spacing between the label and the vertical edge of the widget.
void | vertical_label_margin (int px)
| Set the spacing between the label and the vertical edge of the widget.
unsigned int | visible () const
| Returns whether a widget is visible.
unsigned int | visible_focus () const
| Checks whether this widget has a visible focus.
void | visible_focus (int v)
| Modifies keyboard focus navigation.
int | visible_r () const
| Returns whether a widget and all its parents are visible.
int | w () const
| Gets the widget width.
Fl_When | when () const
| Returns the conditions under which the callback is called.
void | when (uchar i)
| Sets the flags used to decide when a callback is called.
Fl_Window * | window () const
| Returns a pointer to the nearest parent window up the widget hierarchy.
int | x () const
| Gets the widget position in its window.
int | y () const
| Gets the widget position in its window.
virtual | ~Fl_Widget ()
| Destroys the widget.

## Protected Member Functions
| Fl_Valuator (int X, int Y, int W, int H, const char *L)
| Creates a new Fl_Valuator widget using the given position, size, and label string.
void | handle_drag (double newvalue)
| Called during a drag operation, after an FL_WHEN_CHANGED event is received and before the callback.
void | handle_push ()
| Stores the current value in the previous value.
void | handle_release ()
| Called after an FL_WHEN_RELEASE event is received and before the callback.
int | horizontal () const
| Tells if the valuator is an FL_HORIZONTAL one.
double | previous_value () const
| Gets the previous floating point value before an event changed it.
void | set_value (double v)
| Sets the current floating point value.
double | softclamp (double)
| Clamps the value, but accepts v if the previous value is not already out of range.
virtual void | value_damage ()
| Asks for partial redraw.
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.
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.
void | draw_focus () const
| 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 rectangle around the widget.
void | draw_focus (Fl_Boxtype t, int x, int y, int w, int h, Fl_Color bg) 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.
void | draw_label (int, int, int, int) const
| Draws the label in an arbitrary bounding box.
| Fl_Widget (int x, int y, int w, int h, const char *label=0L)
| Creates a widget at the given position and size.
unsigned int | flags () const
| Gets the widget flags mask.
void | h (int v)
| Internal use only.
void | set_flag (unsigned int c)
| Sets a flag in the flags mask.
void | w (int v)
| Internal use only.
void | x (int v)
| Internal use only.
void | y (int v)
| Internal use only.

## Additional Inherited Members
Static Public Member Functions inherited from Fl_Widget
static void | default_callback (Fl_Widget *widget, void *data)
| The default callback for all widgets that don't set a callback.
static unsigned int | label_shortcut (const char *t)
| Returns the Unicode value of the '&x' shortcut in a given text.
static int | test_shortcut (const char *, const bool require_alt=false)
| Returns true if the given text `t` contains the entered '&x' shortcut.
Protected Types inherited from Fl_Widget
enum | { INACTIVE = 1<<0 , INVISIBLE = 1<<1 , OUTPUT = 1<<2 , NOBORDER = 1<<3 , FORCE_POSITION = 1<<4 , NON_MODAL = 1<<5 , SHORTCUT_LABEL = 1<<6 , CHANGED = 1<<7 , OVERRIDE = 1<<8 , VISIBLE_FOCUS = 1<<9 , COPIED_LABEL = 1<<10 , CLIP_CHILDREN = 1<<11 , MENU_WINDOW = 1<<12 , TOOLTIP_WINDOW = 1<<13 , MODAL = 1<<14 , NO_OVERLAY = 1<<15 , GROUP_RELATIVE = 1<<16 , COPIED_TOOLTIP = 1<<17 , FULLSCREEN = 1<<18 , MAC_USE_ACCENTS_MENU = 1<<19 , NEEDS_KEYBOARD = 1<<20 , IMAGE_BOUND = 1<<21 , DEIMAGE_BOUND = 1<<22 , AUTO_DELETE_USER_DATA = 1<<23 , MAXIMIZED = 1<<24 , POPUP = 1<<25 , USERFLAG3 = 1<<29 , USERFLAG2 = 1<<30 , USERFLAG1 = 1<<31 }
| flags possible values enumeration. More...

## Detailed Description

The Fl_Valuator class controls a single floating-point value and provides a consistent interface to set the value, range, and step, and insures that callbacks are done the same for every object.

There are probably more of these classes in FLTK than any others:

In the above diagram each box surrounds an actual subclass. These are further differentiated by setting the type() of the widget to the symbolic value labeling the widget. The ones labelled "0" are the default versions with a type(0). For consistency the symbol FL_VERTICAL is defined as zero.

## Constructor & Destructor Documentation

## ◆ Fl_Valuator()

Fl_Valuator::Fl_Valuator | ( | int | X,
|  | int | Y,
|  | int | W,
|  | int | H,
|  | const char * | L )
| protected

Creates a new Fl_Valuator widget using the given position, size, and label string.

The default boxtype is FL_NO_BOX.

## Member Function Documentation

## ◆ format()

int Fl_Valuator::format | ( | char * | buffer | ) |
| virtual

Uses internal rules to format the fields numerical value into the character array pointed to by the passed parameter.

The actual format used depends on the current step value. If the step value has been set to zero then a %g format is used. If the step value is non-zero, then a %.*f format is used, where the precision is calculated to show sufficient digits for the current step value. An integer step value, such as 1 or 1.0, gives a precision of 0, so the formatted value will appear as an integer.

This method is used by the Fl_Valuator_... group of widgets to format the current value into a text string. The return value is the length of the formatted text. The formatted value is written into `buffer`. `buffer` should have space for at least 128 bytes.

You may override this function to create your own text formatting.

## ◆ increment()

double Fl_Valuator::increment | ( | double | v,
|  | int | n )

Adds n times the step value to the passed value.

If step was set to zero it uses fabs(maximum() - minimum()) / 100.

## ◆ precision()

void Fl_Valuator::precision | ( | int | digits | ) |

Sets the step value to 1.0 / 10digits.

Precision `digits` is limited to 0...9 to avoid internal overflow errors. Values outside this range are clamped.

Note
  For negative values of `digits` the step value is set to `A` = 1.0 and `B` = 1, i.e. 1.0/1 = 1.

## ◆ range()

void Fl_Valuator::range | ( | double | a,
|  | double | b )
| inline

Sets the minimum and maximum values for the valuator.

When the user manipulates the widget, the value is limited to this range. This clamping is done after rounding to the step value (this makes a difference if the range is not a multiple of the step).

The minimum may be greater than the maximum. This has the effect of "reversing" the object so the larger values are in the opposite direction. This also switches which end of the filled sliders is filled.

Some widgets consider this a "soft" range. This means they will stop at the range, but if the user releases and grabs the control again and tries to move it further, it is allowed.

The range may affect the display. You must redraw() the widget after changing the range.

## ◆ round()

double Fl_Valuator::round | ( | double | v | ) |

Round the passed value to the nearest step increment.

Does nothing if step is zero.

## ◆ step()

double Fl_Valuator::step | ( |  | ) | const
| inline

Gets or sets the step value.

As the user moves the mouse the value is rounded to the nearest multiple of the step value. This is done before clamping it to the range. For most widgets the default step is zero.

For precision the step is stored as the ratio of a double `A` and an integer `B` = A/B. You can set these values directly. Currently setting a floating point value sets the nearest A/1 or 1/B value possible.

## ◆ value() [1/2]

double Fl_Valuator::value | ( |  | ) | const
| inline

Gets the floating point(double) value.

See int value(double)

## ◆ value() [2/2]

int Fl_Valuator::value | ( | double | v | ) |

Sets the current value.

The new value is not clamped or otherwise changed before storing it. Use clamp() or round() to modify the value before calling value(). The widget is redrawn if the new value is different than the current one. The initial value is zero.

changed() will return true if the user has moved the slider, but it will be turned off by value(x) and just before doing a callback (the callback can turn it back on if desired).

## ◆ value_damage()

void Fl_Valuator::value_damage | ( |  | ) |
| protected virtual

Asks for partial redraw.

Reimplemented in Fl_Adjuster.

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

- Fl_Valuator.H
- Fl_Valuator.cxx