FLTK 1.3.8: Fl_Color_Chooser Class Reference

FLTK 1.3.8

Public Member Functions | Static Public Member Functions | Related Functions | List of all members
Fl_Color_Chooser Class Reference
Common Dialogs classes and functions

The Fl_Color_Chooser widget provides a standard RGB color chooser. More...

`#include <Fl_Color_Chooser.H>`

Inheritance diagram for Fl_Color_Chooser:

## Public Member Functions
double | b () const
| Returns the current blue value. More...
| Fl_Color_Chooser (int X, int Y, int W, int H, const char *L=0)
| Creates a new Fl_Color_Chooser widget using the given position, size, and label string. More...
double | g () const
| Returns the current green value. More...
int | hsv (double H, double S, double V)
| Set the hsv values. More...
double | hue () const
| Returns the current hue. More...
int | mode ()
| Returns which Fl_Color_Chooser variant is currently active. More...
void | mode (int newMode)
| Set which Fl_Color_Chooser variant is currently active. More...
double | r () const
| Returns the current red value. More...
int | rgb (double R, double G, double B)
| Sets the current rgb color values. More...
double | saturation () const
| Returns the saturation. More...
double | value () const
| Returns the value/brightness. 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...
unsigned int | clip_children ()
| Returns the current clipping mode. More...
void | clip_children (int c)
| Controls whether the group widget clips the drawing of child widgets to its bounding box. More...
void | end ()
| Exactly the same as current(this->parent()). More...
int | find (const Fl_Widget &o) const
| See int Fl_Group::find(const Fl_Widget *w) const.
int | find (const Fl_Widget *) const
| Searches the child array for the widget and returns the index. More...
| 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.
int | handle (int)
| Handles the specified event. More...
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 (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 | remove (int index)
| Removes the widget at `index` from the group but does not delete it. More...
Fl_Widget * | resizable () const
| See void Fl_Group::resizable(Fl_Widget *box)
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...
void | resize (int, int, int, int)
| Resizes the Fl_Group widget and all of its children. More...
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. More...
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)
| Sets 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_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_active ()
| Marks the widget as inactive without sending events or changing focus. 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.
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...
int | is_label_copied () const
| Returns whether the current label was assigned with copy_label(). 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_active ()
| Marks the widget as active without sending events or changing focus. 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...
Fl_Window * | top_window () const
| Returns a pointer to the top-level window for the widget. More...
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. 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...
unsigned int | visible_focus ()
| Checks whether this widget has a visible focus. More...
void | visible_focus (int v)
| Modifies keyboard focus navigation. 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 nearest parent window up the widget hierarchy. 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...

## Static Public Member Functions
static void | hsv2rgb (double H, double S, double V, double &R, double &G, double &B)
| This static method converts HSV colors to RGB colorspace. More...
static void | rgb2hsv (double R, double G, double B, double &H, double &S, double &V)
| This static method converts RGB colors to HSV colorspace. More...
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...
Static Public Member Functions inherited from Fl_Widget
static void | default_callback (Fl_Widget *cb, void *d)
| The default callback for all widgets that don't set a callback. More...
static unsigned int | label_shortcut (const char *t)
| Returns the Unicode value of the '&x' shortcut in a given text. More...
static int | test_shortcut (const char *, const bool require_alt=false)
| Returns true if the given text `t` contains the entered '&x' shortcut. More...

## Related Functions
(Note that these are not member functions.)
int | fl_color_chooser (const char *name, double &r, double &g, double &b, int cmode)
| Pops up a window to let the user pick an arbitrary RGB color. More...
int | fl_color_chooser (const char *name, uchar &r, uchar &g, uchar &b, int cmode)
| Pops up a window to let the user pick an arbitrary RGB color. More...

## Additional Inherited Members
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 , USERFLAG3 = 1<<29 , USERFLAG2 = 1<<30 , USERFLAG1 = 1<<31 }
| flags possible values enumeration. More...
Protected Member Functions inherited from Fl_Group
void | draw ()
| Draws the widget. More...
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.
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.
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 ()
| 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...

## Detailed Description

The Fl_Color_Chooser widget provides a standard RGB color chooser.

You can place any number of the widgets into a panel of your own design. The diagram shows the widget as part of a color chooser dialog created by the fl_color_chooser() function. The Fl_Color_Chooser widget contains the hue box, value slider, and rgb input fields from the above diagram (it does not have the color chips or the Cancel or OK buttons). The callback is done every time the user changes the rgb value. It is not done if they move the hue control in a way that produces the same rgb value, such as when saturation or value is zero.

The fl_color_chooser() function pops up a window to let the user pick an arbitrary RGB color. They can pick the hue and saturation in the "hue box" on the left (hold down CTRL to just change the saturation), and the brightness using the vertical slider. Or they can type the 8-bit numbers into the RGB Fl_Value_Input fields, or drag the mouse across them to adjust them. The pull-down menu lets the user set the input fields to show RGB, HSV, or 8-bit RGB (0 to 255).

fl_color_chooser() returns non-zero if the user picks ok, and updates the RGB values. If the user picks cancel or closes the window this returns zero and leaves RGB unchanged.

If you use the color chooser on an 8-bit screen, it will allocate all the available colors, leaving you no space to exactly represent the color the user picks! You can however use fl_rectf() to fill a region with a simulated color using dithering.

## Constructor & Destructor Documentation

## ◆ Fl_Color_Chooser()

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

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

The recommended dimensions are 200x95. The color is initialized to black.

Parameters

  [in] | X,Y,W,H | position and size of the widget
  [in] | L | widget label, default is no label

## Member Function Documentation

## ◆ b()

double Fl_Color_Chooser::b | ( |  | ) | const
| inline

Returns the current blue value.

0 <= b <= 1.

## ◆ g()

double Fl_Color_Chooser::g | ( |  | ) | const
| inline

Returns the current green value.

0 <= g <= 1.

## ◆ hsv()

int Fl_Color_Chooser::hsv | ( | double | H,
|  | double | S,
|  | double | V
| ) |  |

Set the hsv values.

The passed values are clamped (or for hue, modulus 6 is used) to get legal values. Does not do the callback.

Parameters

  [in] | H,S,V | color components.

Returns
  1 if a new hsv value was set, 0 if the hsv value was the previous one.

## ◆ hsv2rgb()

void Fl_Color_Chooser::hsv2rgb | ( | double | H,
|  | double | S,
|  | double | V,
|  | double & | R,
|  | double & | G,
|  | double & | B
| ) |  |
| static

This static method converts HSV colors to RGB colorspace.

Parameters

  [in] | H,S,V | color components
  [out] | R,G,B | color components

## ◆ hue()

double Fl_Color_Chooser::hue | ( |  | ) | const
| inline

Returns the current hue.

0 <= hue < 6. Zero is red, one is yellow, two is green, etc. This value is convenient for the internal calculations - some other systems consider hue to run from zero to one, or from 0 to 360.

## ◆ mode() [1/2]

int Fl_Color_Chooser::mode | ( |  | ) |
| inline

Returns which Fl_Color_Chooser variant is currently active.

Returns
  color modes are rgb(0), byte(1), hex(2), or hsv(3)

## ◆ mode() [2/2]

void Fl_Color_Chooser::mode | ( | int | newMode | ) |

Set which Fl_Color_Chooser variant is currently active.

Parameters

  [in] | newMode | color modes are rgb(0), byte(1), hex(2), or hsv(3)

## ◆ r()

double Fl_Color_Chooser::r | ( |  | ) | const
| inline

Returns the current red value.

0 <= r <= 1.

## ◆ rgb()

int Fl_Color_Chooser::rgb | ( | double | R,
|  | double | G,
|  | double | B
| ) |  |

Sets the current rgb color values.

Does not do the callback. Does not clamp (but out of range values will produce psychedelic effects in the hue selector).

Parameters

  [in] | R,G,B | color components.

Returns
  1 if a new rgb value was set, 0 if the rgb value was the previous one.

## ◆ rgb2hsv()

void Fl_Color_Chooser::rgb2hsv | ( | double | R,
|  | double | G,
|  | double | B,
|  | double & | H,
|  | double & | S,
|  | double & | V
| ) |  |
| static

This static method converts RGB colors to HSV colorspace.

Parameters

  [in] | R,G,B | color components
  [out] | H,S,V | color components

## ◆ saturation()

double Fl_Color_Chooser::saturation | ( |  | ) | const
| inline

Returns the saturation.

0 <= saturation <= 1.

## ◆ value()

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

Returns the value/brightness.

0 <= value <= 1.

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

- Fl_Color_Chooser.H
- Fl_Color_Chooser.cxx

- Copyright © 1998-2021 by Bill Spitzak and others.