Class Hierarchy
Fl_Group
|
+----Fl_Window
|
+----Fl_Double_Window, Fl_Gl_Window,
Fl_Overlay_Window, Fl_Single_Window
Include Files
#include <FL/Fl_Window.H>
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() and calls
exit(0) if this is the last top-level window.
Methods
The first constructor takes 4 int arguments to create the window with
a preset position and size. The second constructor with 2 arguments
will create the window with a preset size, but the window manager
will choose the position according to it's own whims.
Fl_Widget::box() is set 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.
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 it's children can be automatic (local)
variables, but you must declare the Fl_Window first, so
that it is destroyed last.
Set 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.
- 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.
- aspect is a flag that indicates that the window should
preserve it's aspect ratio. This only works if both the maximum and
minimum have the same aspect ratio.
If this function is not called, FLTK tries to figure out the range
from the setting of resizeable():
- If resizeable() 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 resizeable() is less than
100, then that is considered the minimum size. Otherwise the
resizeable() has a minimum size of 100.
- If either dimension of resizeable() 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().
Put the window on the screen. Usually this has the side effect of
opening the display. The second two forms are used for top-level
windows and allow standard arguments to be parsed from the
command-line.
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.
Remove the window from the screen. If the window is already hidden or
has not been shown then this does nothing (and is harmless). Under the
X Window System this actually destroys the xid.
Returns non-zero if show() has been called (but not hide()).
You can tell if a window is iconified with (w->shown() && !w->visible()).
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.
Returns the first shown() window in the widget hierarchy.
If no windows are displayed first_window returns NULL.
Returns the next shown() window in the hierarchy. You can use this
call to iterate through all the windows that are shown().
Change 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.
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.
position() 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).
Makes the window completely fill the screen, without any window manager
border visible. You must use fullscreen_off() to undo this.
This may not work with all window managers.
Turns off any side effects of fullscreen() and does
resize(x,y,w,h).
Gets or sets whether or not the window manager border is around the
window. The default value is true. border(n) can be used to
turn the border on and off, and returns non-zero if the value has been
changed. Under most X window managers this does not work after
show() has been called, although SGI's 4DWM does work.
clear_border() is a fast inline function to turn the border
off. It only works before show() is called.
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().
Returns true if this window is 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. There are three states for a window:
modal, non-modal, and normal.
Returns true if this window is modal or non-modal.
Gets or sets the window title bar label.
Gets or sets the icon label.
A string used to tell the system what type of window this is.
Mostly this identifies the picture to draw in the icon. 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". This only works if
called before calling show().
This method has no effect under Microsoft Windows.
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
classes.
Returns the last window that was made current.