FLTK 1.3.0
Fl_Overlay_Window Class Reference

This window provides double buffering and also the ability to draw the "overlay" which is another picture placed on top of the main image. More...

#include <Fl_Overlay_Window.H>

Inheritance diagram for Fl_Overlay_Window:
Fl_Double_Window Fl_Window Fl_Group Fl_Widget

Public Member Functions

int can_do_overlay ()
 Fl_Overlay_Window (int W, int H, const char *l=0)
 Creates a new Fl_Overlay_Window widget using the given position, size, and label (title) string.
 Fl_Overlay_Window (int X, int Y, int W, int H, const char *l=0)
 See Fl_Overlay_Window::Fl_Overlay_Window(int W, int H, const char *l=0)
void flush ()
 Forces the window to be redrawn.
void hide ()
 Removes the window from the screen.
void redraw_overlay ()
 Call this to indicate that the overlay data has changed and needs to be redrawn.
void resize (int, int, int, int)
 Changes the size and position of the window.
void show ()
 Puts the window on the screen.
void show (int a, char **b)
 Puts the window on the screen and parses command-line arguments.
 ~Fl_Overlay_Window ()
 Destroys the window and all child widgets.
- Public Member Functions inherited from Fl_Double_Window
 Fl_Double_Window (int W, int H, const char *l=0)
 Creates a new Fl_Double_Window widget using the given position, size, and label (title) string.
 Fl_Double_Window (int X, int Y, int W, int H, const char *l=0)
 See Fl_Double_Window::Fl_Double_Window(int w, int h, const char *label = 0)
 ~Fl_Double_Window ()
 The destructor also deletes all the children.
- Public Member Functions inherited from Fl_Window
virtual Fl_Windowas_window ()
 Returns an Fl_Window pointer if this widget is an Fl_Window.
void border (int b)
 Sets whether or not the window manager border is around the window.
unsigned int border () const
 See void Fl_Window::border(int)
void clear_border ()
 Fast inline function to turn the window manager border off.
void copy_label (const char *a)
 Sets the current label.
void cursor (Fl_Cursor, Fl_Color=FL_BLACK, Fl_Color=FL_WHITE)
 Changes the cursor for this window.
int decorated_h ()
 Returns the window height including any window title bar and any frame added by the window manager.
int decorated_w ()
 Returns the window width including any frame added by the window manager.
void default_cursor (Fl_Cursor, Fl_Color=FL_BLACK, Fl_Color=FL_WHITE)
 Sets the default window cursor as well as its color.
 Fl_Window (int w, int h, const char *title=0)
 Creates a window from the given size and title.
 Fl_Window (int x, int y, int w, int h, const char *title=0)
 Creates a window from the given position, size and title.
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.
void fullscreen ()
 Makes the window completely fill the screen, without any window manager border visible.
void fullscreen_off (int, int, int, int)
 Turns off any side effects of fullscreen() and does resize(x,y,w,h).
virtual int handle (int)
 Handles the specified event.
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.
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.
void icon (const void *ic)
 Sets the current icon window target dependent data.
void iconize ()
 Iconifies the window.
const char * iconlabel () const
 See void Fl_Window::iconlabel(const char*)
void iconlabel (const char *)
 Sets the icon label.
const char * label () const
 See void Fl_Window::label(const char*)
void label (const char *)
 Sets the window title bar label.
void label (const char *label, const char *iconlabel)
 Sets the icon label.
void make_current ()
 Sets things up so that the drawing functions in <FL/fl_draw.H> will go into this window.
unsigned int menu_window () const
 Returns true if this window is a menu window.
unsigned int modal () const
 Returns true if this window is modal.
unsigned int non_modal () const
 Returns true if this window is modal or non-modal.
unsigned int override () const
 Returns non zero if FL_OVERRIDE flag is set, 0 otherwise.
void set_menu_window ()
 Marks the window as a menu window.
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).
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.
void set_override ()
 Activates the flags NOBORDER|FL_OVERRIDE.
void set_tooltip_window ()
 Marks the window as a tooltip window.
int shown ()
 Returns non-zero if show() has been called (but not hide() ).
void size_range (int a, int b, int c=0, int d=0, int e=0, int f=0, int g=0)
 Sets the allowable range the user can resize this window to.
unsigned int tooltip_window () const
 Returns true if this window is a tooltip window.
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.
void xclass (const char *c)
 Sets the xclass for this window.
int y_root () const
 Gets the y position of the window on the screen.
virtual ~Fl_Window ()
 The destructor also deletes all the children.
- 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.
virtual Fl_Groupas_group ()
 Returns an Fl_Group pointer if this widget is an Fl_Group.
void begin ()
 Sets the current group so you can build the widget tree by just constructing the widgets.
Fl_Widgetchild (int n) const
 Returns array()[n].
int children () const
 Returns how many child widgets the group has.
void clear ()
 Deletes all child widgets from memory recursively.
void clip_children (int c)
 Controls whether the group widget clips the drawing of child widgets to its bounding box.
unsigned int clip_children ()
 Returns the current clipping mode.
void end ()
 Exactly the same as current(this->parent()).
int find (const Fl_Widget *) const
 Searches the child array for the widget and returns the index.
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.
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.
void insert (Fl_Widget &, int i)
 The widget is removed from its current group (if any) and then inserted into this group.
void insert (Fl_Widget &o, Fl_Widget *before)
 This does insert(w, find(before)).
void remove (int index)
 Removes the widget at index from the group but does not delete it.
void remove (Fl_Widget &)
 Removes a widget from the group but does not delete it.
void remove (Fl_Widget *o)
 Removes the widget o from the group.
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.
Fl_Widgetresizable () const
 See void Fl_Group::resizable(Fl_Widget *box)
virtual ~Fl_Group ()
 The destructor also deletes all the children.
- Public Member Functions inherited from Fl_Widget
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_Windowas_gl_window ()
 Returns an Fl_Gl_Window pointer if this widget is an Fl_Gl_Window.
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, void *p)
 Sets the current callback function for the widget.
void callback (Fl_Callback *cb)
 Sets the current callback function 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_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_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_Imagedeimage ()
 Gets the image that is used as part of the widget label.
const Fl_Imagedeimage () const
void deimage (Fl_Image *img)
 Sets the image to use as part of the widget label.
void deimage (Fl_Image &img)
 Sets the image to use as part of the widget label.
void do_callback ()
 Calls the widget callback.
void do_callback (Fl_Widget *o, long arg)
 Calls the widget callback.
void do_callback (Fl_Widget *o, void *arg=0)
 Calls the widget callback.
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.
Fl_Imageimage ()
 Gets the image that is used as part of the widget label.
const Fl_Imageimage () const
void image (Fl_Image *img)
 Sets the image to use as part of the widget label.
void image (Fl_Image &img)
 Sets the image to use as part of the widget label.
int inside (const Fl_Widget *w) const
 Checks if this widget is a child of w.
void label (Fl_Labeltype a, const char *b)
 Shortcut to set the label text and type in one call.
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.
unsigned int output () const
 Returns if a widget is used for output only.
Fl_Groupparent () 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.
Fl_Color selection_color () const
 Gets the selection color.
void selection_color (Fl_Color a)
 Sets the selection color.
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.
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.
uchar type () const
 Gets the widget type.
void type (uchar t)
 Sets the widget type.
void * user_data () const
 Gets the user data for this widget.
void user_data (void *v)
 Sets the user data for this widget.
unsigned int visible () const
 Returns whether a widget is visible.
void visible_focus (int v)
 Modifies keyboard focus navigation.
unsigned int visible_focus ()
 Checks whether this widget has a visible focus.
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_Windowwindow () const
 Returns a pointer to the primary Fl_Window widget.
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.

Friends

class _Fl_Overlay

Additional Inherited Members

- Static Public Member Functions inherited from Fl_Window
static Fl_Windowcurrent ()
 Returns the last window that was made current.
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.
static const char * default_xclass ()
 Returns the default xclass.
- 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, USERFLAG3 = 1<<29, USERFLAG2 = 1<<30,
  USERFLAG1 = 1<<31
}
 flags possible values enumeration. More...
- Protected Member Functions inherited from Fl_Double_Window
void flush (int eraseoverlay)
 Forces the window to be redrawn.
- Protected Attributes inherited from Fl_Double_Window
char force_doublebuffering_
 Force double buffering, even if the OS already buffers windows (overlays need that on MacOS and Windows2000)
- Static Protected Attributes inherited from Fl_Window
static Fl_Windowcurrent_
 Stores the last window that was made current.

Detailed Description

This window provides double buffering and also the ability to draw the "overlay" which is another picture placed on top of the main image.

The overlay is designed to be a rapidly-changing but simple graphic such as a mouse selection box. Fl_Overlay_Window uses the overlay planes provided by your graphics hardware if they are available.

If no hardware support is found the overlay is simulated by drawing directly into the on-screen copy of the double-buffered window, and "erased" by copying the backbuffer over it again. This means the overlay will blink if you change the image in the window.

Constructor & Destructor Documentation

Fl_Overlay_Window::Fl_Overlay_Window ( int  W,
int  H,
const char *  l = 0 
)
inline

Creates a new Fl_Overlay_Window widget using the given position, size, and label (title) string.

If the positions (x,y) are not given, then the window manager will choose them.

Member Function Documentation

void Fl_Overlay_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_Double_Window.

void Fl_Overlay_Window::redraw_overlay ( )

Call this to indicate that the overlay data has changed and needs to be redrawn.

The overlay will be clear until the first time this is called, so if you want an initial display you must call this after calling show().

void Fl_Overlay_Window::resize ( int  ,
int  ,
int  ,
int   
)
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_Double_Window.

void Fl_Overlay_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_Double_Window.

void Fl_Overlay_Window::show ( int  argc,
char **  argv 
)
inline

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
argccommand-line argument count, usually from main()
argvcommand-line argument vector, usually from main()
See Also
virtual void Fl_Window::show()

Reimplemented from Fl_Double_Window.


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