Fl_Window Class Reference

This widget produces an actual window. More...

`#include <Fl_Window.H>`

Inheritance diagram for Fl_Window:

## Public Member Functions

virtual Fl_Window * | as_window ()
| Returns an Fl_Window pointer if this widget is an Fl_Window. More...
void | border (int b)
| Sets whether or not the window manager border is around the window. More...
unsigned int | border () const
| See void Fl_Window::border(int)
void | clear_border ()
| Fast inline function to turn the window manager border off. More...
void | copy_label (const char *a)
void | cursor (Fl_Cursor, Fl_Color=FL_BLACK, Fl_Color=FL_WHITE)
| Changes the cursor for this window. More...
int | decorated_h ()
| Returns the window height including any window title bar and any frame added by the window manager. More...
int | decorated_w ()
| Returns the window width including any frame added by the window manager. More...
void | default_cursor (Fl_Cursor, Fl_Color=FL_BLACK, Fl_Color=FL_WHITE)
| Sets the default window cursor as well as its color. More...
| Fl_Window (int w, int h, const char *title=0)
| Creates a window from the given size and title. More...
| Fl_Window (int x, int y, int w, int h, const char *title=0)
| Creates a window from the given position, size and title. More...
void | free_position ()
| Undoes the effect of a previous resize() or show() so that the next time show() is called the window manager is free to position the window. More...
void | fullscreen ()
| Makes the window completely fill the screen, without any window manager border visible. More...
unsigned int | fullscreen_active () const
| Returns non zero if FULLSCREEN flag is set, 0 otherwise.
void | fullscreen_off ()
| Turns off any side effects of fullscreen()
void | fullscreen_off (int X, int Y, int W, int H)
| Turns off any side effects of fullscreen() and does resize(x,y,w,h).
virtual int | handle (int)
| Handles the specified event. More...
virtual void | hide ()
| Removes the window from the screen. More...
void | hotspot (int x, int y, int offscreen=0)
| Positions the window so that the mouse is pointing at the given position, or at the center of the given widget, which may be the window itself. More...
void | hotspot (const Fl_Widget *, int offscreen=0)
| See void Fl_Window::hotspot(int x, int y, int offscreen = 0)
void | hotspot (const Fl_Widget &p, int offscreen=0)
| See void Fl_Window::hotspot(int x, int y, int offscreen = 0)
const void * | icon () const
| Gets the current icon window target dependent data. More...
void | icon (const void *ic)
| Sets the current icon window target dependent data. More...
void | iconize ()
| Iconifies the window. More...
const char * | iconlabel () const
| See void Fl_Window::iconlabel(const char*)
void | iconlabel (const char *)
| Sets the icon label. More...
const char * | label () const
| See void Fl_Window::label(const char*)
void | label (const char *)
| Sets the window title bar label. More...
void | label (const char *label, const char *iconlabel)
| Sets the icon label. More...
void | make_current ()
| Sets things up so that the drawing functions in <FL/fl_draw.H> will go into this window. More...
unsigned int | menu_window () const
| Returns true if this window is a menu window. More...
unsigned int | modal () const
| Returns true if this window is modal. More...
unsigned int | non_modal () const
| Returns true if this window is modal or non-modal. More...
unsigned int | override () const
| Returns non zero if FL_OVERRIDE flag is set, 0 otherwise. More...
virtual void | resize (int X, int Y, int W, int H)
| Changes the size and position of the window. More...
void | set_menu_window ()
| Marks the window as a menu window. More...
void | set_modal ()
| A "modal" window, when shown(), will prevent any events from being delivered to other windows in the same program, and will also remain on top of the other windows (if the X window manager supports the "transient for" property). More...
void | set_non_modal ()
| A "non-modal" window (terminology borrowed from Microsoft Windows) acts like a modal() one in that it remains on top, but it has no effect on event delivery. More...
void | set_override ()
| Activates the flags NOBORDER|FL_OVERRIDE.
void | set_tooltip_window ()
| Marks the window as a tooltip window. More...
virtual void | show ()
| Puts the window on the screen. More...
void | show (int argc, char **argv)
| Puts the window on the screen and parses command-line arguments. More...
int | shown ()
| Returns non-zero if show() has been called (but not hide() ). More...
void | size_range (int minw, int minh, int maxw=0, int maxh=0, int dw=0, int dh=0, int aspect=0)
| Sets the allowable range the user can resize this window to. More...
unsigned int | tooltip_window () const
| Returns true if this window is a tooltip window. More...
int | x_root () const
| Gets the x position of the window on the screen.
const char * | xclass () const
| Returns the xclass for this window, or a default. More...
void | xclass (const char *c)
| Sets the xclass for this window. More...
int | y_root () const
| Gets the y position of the window on the screen.
virtual | ~Fl_Window ()
| The destructor also deletes all the children. 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...
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...
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...
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...

## Static Public Member Functions

static Fl_Window * | current ()
| Returns the last window that was made current. More...
static void | default_callback (Fl_Window *, void *v)
| Back compatibility: Sets the default callback v for win to call on close event.
static void | default_xclass (const char *)
| Sets the default window xclass. More...
static const char * | default_xclass ()
| Returns the default xclass. 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)
| Sets the default callback for all widgets. 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...

## Protected Member Functions

virtual void | draw ()
| Draws the widget. More...
virtual void | flush ()
| Forces the window to be drawn, this window is also made current and calls draw(). More...
void | force_position (int force)
| Sets an internal flag that tells FLTK and the window manager to honor position requests. More...
int | force_position () const
| Returns the internal state of the window's FORCE_POSITION flag. More...
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 Attributes

static Fl_Window * | current_
| Stores the last window that was made current. More...

## Friends

class | Fl_X

## 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...

## Detailed Description

This widget produces an actual window.

This can either be a main window, with a border and title and all the window management controls, or a "subwindow" inside a window. This is controlled by whether or not the window has a parent().

Once you create a window, you usually add children Fl_Widget 's to it by using window->add(child) for each new widget. See Fl_Group for more information on how to add and remove children.

There are several subclasses of Fl_Window that provide double-buffering, overlay, menu, and OpenGL support.

The window's callback is done if the user tries to close a window using the window manager and Fl::modal() is zero or equal to the window. Fl_Window has a default callback that calls Fl_Window::hide().

## Constructor & Destructor Documentation

Fl_Window::Fl_Window | ( | int | w,
|  | int | h,
|  | const char * | title = `0`
| ) |  |

Creates a window from the given size and title.

If Fl_Group::current() is not NULL, the window is created as a subwindow of the parent window.

The (w,h) form of the constructor creates a top-level window and asks the window manager to position the window. The (x,y,w,h) form of the constructor either creates a subwindow or a top-level window at the specified location (x,y) , subject to window manager configuration. If you do not specify the position of the window, the window manager will pick a place to show the window or allow the user to pick a location. Use position(x,y) or hotspot() before calling show() to request a position on the screen. See Fl_Window::resize() for some more details on positioning windows.

Top-level windows initially have visible() set to 0 and parent() set to NULL. Subwindows initially have visible() set to 1 and parent() set to the parent window pointer.

Fl_Widget::box() defaults to FL_FLAT_BOX. If you plan to completely fill the window with children widgets you should change this to FL_NO_BOX. If you turn the window border off you may want to change this to FL_UP_BOX.

See Also
  Fl_Window(int x, int y, int w, int h, const char* title)

Fl_Window::Fl_Window | ( | int | x,
|  | int | y,
|  | int | w,
|  | int | h,
|  | const char * | title = `0`
| ) |  |

Creates a window from the given position, size and title.

See Also
  Fl_Window(int w, int h, const char *title)

Fl_Window::~Fl_Window | ( |  | ) |

virtual

The destructor also deletes all the children.

This allows a whole tree to be deleted at once, without having to keep a pointer to all the children in the user code. A kludge has been done so the Fl_Window and all of its children can be automatic (local) variables, but you must declare the Fl_Window first so that it is destroyed last.

## Member Function Documentation

virtual Fl_Window* Fl_Window::as_window | ( |  | ) |

inlinevirtual

Returns an Fl_Window pointer if this widget is an Fl_Window.

Use this method if you have a widget (pointer) and need to know whether this widget is derived from Fl_Window. If it returns non-NULL, then the widget in question is derived from Fl_Window, and you can use the returned pointer to access its children or other Fl_Window-specific methods.

Return values

  NULL | if this widget is not derived from Fl_Window.

Note
  This method is provided to avoid dynamic_cast.

See Also
  Fl_Widget::as_group(), Fl_Widget::as_gl_window()

Reimplemented from Fl_Widget.

void Fl_Window::border | ( | int | b | ) |

Sets whether or not the window manager border is around the window.

The default value is true. void border(int) can be used to turn the border on and off. Under most X window managers this does not work after show() has been called, although SGI's 4DWM does work.

void Fl_Window::clear_border | ( |  | ) |

inline

Fast inline function to turn the window manager border off.

It only works before show() is called.

Fl_Window * Fl_Window::current | ( |  | ) |

static

Returns the last window that was made current.

See Also
  Fl_Window::make_current()

void Fl_Window::cursor | ( | Fl_Cursor | c,
|  | Fl_Color | fg = `FL_BLACK`,
|  | Fl_Color | bg = `FL_WHITE`
| ) |  |

Changes the cursor for this window.

This always calls the system, if you are changing the cursor a lot you may want to keep track of how you set it in a static variable and call this only if the new cursor is different.

The type Fl_Cursor is an enumeration defined in <FL/Enumerations.H>. (Under X you can get any XC_cursor value by passing Fl_Cursor((XC_foo/2)+1)). The colors only work on X, they are not implemented on WIN32.

For back compatibility only.

int Fl_Window::decorated_h | ( |  | ) |

Returns the window height including any window title bar and any frame added by the window manager.

Same as h() if applied to a subwindow.

int Fl_Window::decorated_w | ( |  | ) |

Returns the window width including any frame added by the window manager.

Same as w() if applied to a subwindow.

void Fl_Window::default_cursor | ( | Fl_Cursor | c,
|  | Fl_Color | fg = `FL_BLACK`,
|  | Fl_Color | bg = `FL_WHITE`
| ) |  |

Sets the default window cursor as well as its color.

For back compatibility only.

void Fl_Window::default_xclass | ( | const char * | xc | ) |

static

Sets the default window xclass.

The default xclass is used for all windows that don't have their own xclass set before show() is called. You can change the default xclass whenever you want, but this only affects windows that are created (and shown) after this call.

The given string `xc` is copied. You can use a local variable or free the string immediately after this call.

If you don't call this, the default xclass for all windows will be "FLTK". You can reset the default xclass by specifying NULL for `xc`.

If you call Fl_Window::xclass(const char *) for any window, then this also sets the default xclass, unless it has been set before.

Parameters

  [in] | xc | default xclass for all windows subsequently created

See Also
  Fl_Window::xclass(const char *)

const char * Fl_Window::default_xclass | ( |  | ) |

static

Returns the default xclass.

See Also
  Fl_Window::default_xclass(const char *)

void Fl_Window::draw | ( |  | ) |

protectedvirtual

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.

Reimplemented in Fl_Gl_Window, Fl_Cairo_Window, and Fl_Glut_Window.

void Fl_Window::flush | ( |  | ) |

protectedvirtual

Forces the window to be drawn, this window is also made current and calls draw().

Reimplemented in Fl_Gl_Window, Fl_Overlay_Window, Fl_Double_Window, Fl_Single_Window, and Fl_Menu_Window.

void Fl_Window::force_position | ( | int | force | ) |

inlineprotected

Sets an internal flag that tells FLTK and the window manager to honor position requests.

This is used internally and should not be needed by user code.

Parameters

  [in] | force | 1 to set the FORCE_POSITION flag, 0 to clear it

int Fl_Window::force_position | ( |  | ) | const

inlineprotected

Returns the internal state of the window's FORCE_POSITION flag.

Return values

  1 | if flag is set
  0 | otherwise

See Also
  force_position(int)

void Fl_Window::free_position | ( |  | ) |

inline

Undoes the effect of a previous resize() or show() so that the next time show() is called the window manager is free to position the window.

This is for Forms compatibility only.

Deprecated:
  please use force_position(0) instead

void Fl_Window::fullscreen | ( |  | ) |

Makes the window completely fill the screen, without any window manager border visible.

You must use fullscreen_off() to undo this.

Note
  On some platforms, this can result in the keyboard being grabbed. The window may also be recreated, meaning hide() and show() will be called.

int Fl_Window::handle | ( | int | event | ) |

virtual

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_Gl_Window, and Fl_Glut_Window.

void Fl_Window::hide | ( |  | ) |

virtual

Removes the window from the screen.

If the window is already hidden or has not been shown then this does nothing and is harmless.

Reimplemented from Fl_Widget.

Reimplemented in Fl_Gl_Window, Fl_Overlay_Window, Fl_Double_Window, and Fl_Menu_Window.

void Fl_Window::hotspot | ( | int | x,
|  | int | y,
|  | int | offscreen = `0`
| ) |  |

Positions the window so that the mouse is pointing at the given position, or at the center of the given widget, which may be the window itself.

If the optional offscreen parameter is non-zero, then the window is allowed to extend off the screen (this does not work with some X window managers).

See Also
  position()

const void * Fl_Window::icon | ( |  | ) | const

Gets the current icon window target dependent data.

void Fl_Window::icon | ( | const void * | ic | ) |

Sets the current icon window target dependent data.

void Fl_Window::iconize | ( |  | ) |

Iconifies the window.

If you call this when shown() is false it will show() it as an icon. If the window is already iconified this does nothing.

Call show() to restore the window.

When a window is iconified/restored (either by these calls or by the user) the handle() method is called with FL_HIDE and FL_SHOW events and visible() is turned on and off.

There is no way to control what is drawn in the icon except with the string passed to Fl_Window::xclass(). You should not rely on window managers displaying the icons.

void Fl_Window::iconlabel | ( | const char * | iname | ) |

Sets the icon label.

void Fl_Window::label | ( | const char * | name | ) |

Sets the window title bar label.

void Fl_Window::label | ( | const char * | label,
|  | const char * | iconlabel
| ) |  |

Sets the icon label.

void Fl_Window::make_current | ( |  | ) |

Sets things up so that the drawing functions in <FL/fl_draw.H> will go into this window.

This is useful for incremental update of windows, such as in an idle callback, which will make your program behave much better if it draws a slow graphic. Danger: incremental update is very hard to debug and maintain!

This method only works for the Fl_Window and Fl_Gl_Window derived classes.

unsigned int Fl_Window::menu_window | ( |  | ) | const

inline

Returns true if this window is a menu window.

unsigned int Fl_Window::modal | ( |  | ) | const

inline

Returns true if this window is modal.

unsigned int Fl_Window::non_modal | ( |  | ) | const

inline

Returns true if this window is modal or non-modal.

unsigned int Fl_Window::override | ( |  | ) | const

inline

Returns non zero if FL_OVERRIDE flag is set, 0 otherwise.

virtual void Fl_Window::resize | ( | int | X,
|  | int | Y,
|  | int | W,
|  | int | H
| ) |  |

virtual

Changes the size and position of the window.

If shown() is true, these changes are communicated to the window server (which may refuse that size and cause a further resize). If shown() is false, the size and position are used when show() is called. See Fl_Group for the effect of resizing on the child widgets.

You can also call the Fl_Widget methods size(x,y) and position(w,h), which are inline wrappers for this virtual function.

A top-level window can not force, but merely suggest a position and size to the operating system. The window manager may not be willing or able to display a window at the desired position or with the given dimensions. It is up to the application developer to verify window parameters after the resize request.

Reimplemented from Fl_Group.

Reimplemented in Fl_Gl_Window, Fl_Overlay_Window, and Fl_Double_Window.

void Fl_Window::set_menu_window | ( |  | ) |

inline

Marks the window as a menu window.

This is intended for internal use, but it can also be used if you write your own menu handling. However, this is not recommended.

This flag is used for correct "parenting" of windows in communication with the windowing system. Modern X window managers can use different flags to distinguish menu and tooltip windows from normal windows.

This must be called before the window is shown and cannot be changed later.

void Fl_Window::set_modal | ( |  | ) |

inline

A "modal" window, when shown(), will prevent any events from being delivered to other windows in the same program, and will also remain on top of the other windows (if the X window manager supports the "transient for" property).

Several modal windows may be shown at once, in which case only the last one shown gets events. You can see which window (if any) is modal by calling Fl::modal().

void Fl_Window::set_non_modal | ( |  | ) |

inline

A "non-modal" window (terminology borrowed from Microsoft Windows) acts like a modal() one in that it remains on top, but it has no effect on event delivery.

There are three states for a window: modal, non-modal, and normal.

void Fl_Window::set_tooltip_window | ( |  | ) |

inline

Marks the window as a tooltip window.

This is intended for internal use, but it can also be used if you write your own tooltip handling. However, this is not recommended.

This flag is used for correct "parenting" of windows in communication with the windowing system. Modern X window managers can use different flags to distinguish menu and tooltip windows from normal windows.

This must be called before the window is shown and cannot be changed later.

Note
  Since Fl_Tooltip_Window is derived from Fl_Menu_Window, this also clears the menu_window() state.

virtual void Fl_Window::show | ( |  | ) |

virtual

Puts the window on the screen.

Usually (on X) this has the side effect of opening the display.

If the window is already shown then it is restored and raised to the top. This is really convenient because your program can call show() at any time, even if the window is already up. It also means that show() serves the purpose of raise() in other toolkits.

Fl_Window::show(int argc, char **argv) is used for top-level windows and allows standard arguments to be parsed from the command-line.

See Also
  Fl_Window::show(int argc, char **argv)

Reimplemented from Fl_Widget.

Reimplemented in Fl_Gl_Window, Fl_Overlay_Window, Fl_Double_Window, Fl_Single_Window, and Fl_Menu_Window.

void Fl_Window::show | ( | int | argc,
|  | char ** | argv
| ) |  |

Puts the window on the screen and parses command-line arguments.

Usually (on X) this has the side effect of opening the display.

This form should be used for top-level windows, at least for the first (main) window. It allows standard arguments to be parsed from the command-line. You can use `argc` and `argv` from main(int argc, char **argv) for this call.

The first call also sets up some system-specific internal variables like the system colors.

Todo:
  explain which system parameters are set up.

Parameters

  argc | command-line argument count, usually from main()
  argv | command-line argument vector, usually from main()

See Also
  virtual void Fl_Window::show()

int Fl_Window::shown | ( |  | ) |

inline

Returns non-zero if show() has been called (but not hide() ).

You can tell if a window is iconified with (w->shown() && !w->visible()).

void Fl_Window::size_range | ( | int | minw,
|  | int | minh,
|  | int | maxw = `0`,
|  | int | maxh = `0`,
|  | int | dw = `0`,
|  | int | dh = `0`,
|  | int | aspect = `0`
| ) |  |

inline

Sets the allowable range the user can resize this window to.

This only works for top-level windows.

- `minw` and `minh` are the smallest the window can be. Either value must be greater than 0.
- `maxw` and `maxh` are the largest the window can be. If either is equal to the minimum then you cannot resize in that direction. If either is zero then FLTK picks a maximum size in that direction such that the window will fill the screen.
- `dw` and `dh` are size increments. The window will be constrained to widths of minw + N * dw, where N is any non-negative integer. If these are less or equal to 1 they are ignored (this is ignored on WIN32).
- `aspect` is a flag that indicates that the window should preserve its aspect ratio. This only works if both the maximum and minimum have the same aspect ratio (ignored on WIN32 and by many X window managers).

If this function is not called, FLTK tries to figure out the range from the setting of resizable():

- If resizable() is NULL (this is the default) then the window cannot be resized and the resize border and max-size control will not be displayed for the window.
- If either dimension of resizable() is less than 100, then that is considered the minimum size. Otherwise the resizable() has a minimum size of 100.
- If either dimension of resizable() is zero, then that is also the maximum size (so the window cannot resize in that direction).

It is undefined what happens if the current size does not fit in the constraints passed to size_range().

unsigned int Fl_Window::tooltip_window | ( |  | ) | const

inline

Returns true if this window is a tooltip window.

const char * Fl_Window::xclass | ( |  | ) | const

Returns the xclass for this window, or a default.

See Also
  Fl_Window::default_xclass(const char *)
  Fl_Window::xclass(const char *)

void Fl_Window::xclass | ( | const char * | xc | ) |

Sets the xclass for this window.

A string used to tell the system what type of window this is. Mostly this identifies the picture to draw in the icon. This only works if called before calling show().

Under X, this is turned into a XA_WM_CLASS pair by truncating at the first non-alphanumeric character and capitalizing the first character, and the second one if the first is 'x'. Thus "foo" turns into "foo, Foo", and "xprog.1" turns into "xprog, XProg".

Under Microsoft Windows, this string is used as the name of the WNDCLASS structure, though it is not clear if this can have any visible effect.

Since
  FLTK 1.3 the passed string is copied. You can use a local variable or free the string immediately after this call. Note that FLTK 1.1 stores the pointer without copying the string.

If the default xclass has not yet been set, this also sets the default xclass for all windows created subsequently.

See Also
  Fl_Window::default_xclass(const char *)

## Member Data Documentation

Fl_Window* Fl_Window::current_

staticprotected

Stores the last window that was made current.

See current() const

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

- Fl_Window.H
- Fl.cxx
- Fl_arg.cxx
- fl_cursor.cxx
- Fl_Window.cxx
- Fl_Window_fullscreen.cxx
- Fl_Window_hotspot.cxx
- Fl_Window_iconize.cxx

- © 1998-2012 by Bill Spitzak and others.