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Michael R Sweet
1998-12-29 14:21:17 +00:00
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documentation/Fl_Double_Window.html
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<body>
<hr break>
<h2><a name="Fl_Double_Window">class Fl_Double_Window</a></h2>
<hr>
<h3>Class Hierarchy</h3>
<ul><pre>
<a href="#Fl_Window">Fl_Window</a>
|
+----<b>Fl_Double_Window</b>
</pre></ul>
<h3>Include Files</h3>
<ul><pre>
#include &lt;FL/Fl_Double_Window.H>
</pre></ul>
<h3>Description</h3>
The <tt>Fl_Double_Window</tt> class provides a double-buffered window.
If possible this will use the X double buffering extension (Xdbe). If
not, it will draw the window data into an off-screen pixmap, and then
copy it to the on-screen window.
<p>It is highly recommended that you put the following code before the
first <tt>show()</tt> of <i>any</i> window in your program:
<ul><pre>
Fl::visual(FL_DOUBLE|FL_INDEX)
</pre></ul>
This makes sure you can use Xdbe on servers where double buffering does
not exist for every visual.
<h3>Methods</h3>
<ul>
<li><a href="#Fl_Double_Window.Fl_Double_Window">Fl_Double_Window</a>
<li><a href="#Fl_Double_Window.~Fl_Double_Window">~Fl_Double_Window</a>
<li><a href="#Fl_Double_Window.pixmap">pixmap</a>
</ul>
<h4><a name="Fl_Double_Window.Fl_Double_Window">Fl_Double_Window::Fl_Double_Window(int x, int y, int w, int h, const char *label = 0)</a></h4>
Creates a new <tt>Fl_Double_Window</tt> widget using the given position, size, and
label (title) string.
<h4><a name="Fl_Double_Window.~Fl_Double_Window">virtual Fl_Double_Window::~Fl_Double_Window()</a></h4>
The destructor <i>also deletes all the children</i>. This allows a
whole tree to be deleted at once, without having to keep a pointer to all
the children in the user code.
<h4><a name="Fl_Double_Window.pixmap>ulong Fl_Double_Window::pixmap() const</a></h4>
Returns the off-screen pixmap or back buffer. This value is zero until
the first time <tt>flush()</tt> is called.
</body>
</html>