diff options
| author | Albrecht Schlosser <albrechts.fltk@online.de> | 2008-09-14 21:58:12 +0000 |
|---|---|---|
| committer | Albrecht Schlosser <albrechts.fltk@online.de> | 2008-09-14 21:58:12 +0000 |
| commit | de6f468b5121df32566bbaa3b250d35eae8e1178 (patch) | |
| tree | 0f4b8e5b0fdccb9bb7ba3f07a49c4ebed11ca77f /documentation/basics.dox | |
| parent | 7f544a0cf941eeaf7760700839d8a2b143a540e2 (diff) | |
Edited basic chapters to be more doxygen-friendly, added \image html
statements.
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@6245 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
Diffstat (limited to 'documentation/basics.dox')
| -rw-r--r-- | documentation/basics.dox | 201 |
1 files changed, 94 insertions, 107 deletions
diff --git a/documentation/basics.dox b/documentation/basics.dox index 3c330f907..ed5c3812d 100644 --- a/documentation/basics.dox +++ b/documentation/basics.dox @@ -7,84 +7,82 @@ that use FLTK.</P> <H2>Writing Your First FLTK Program</H2> -<P>All programs must include the file <TT><FL/Fl.H></TT>. +<P>All programs must include the file <TT><FL/Fl.H></TT>. In addition the program must include a header file for each -FLTK class it uses. Listing 1 shows a simple "Hello, -World!" program that uses FLTK to display the window.</P> +FLTK class it uses. Listing 1 shows a simple "Hello, +World!" program that uses FLTK to display the window.</P> -<UL> -<P><I>Listing 1 - "hello.cxx"</I> -<PRE> -#include <FL/Fl.H> -#include <FL/Fl_Window.H> -#include <FL/Fl_Box.H> +<P><I>Listing 1 - "hello.cxx"</I> +\code +#include <FL/Fl.H> +#include <FL/Fl_Window.H> +#include <FL/Fl_Box.H> int main(int argc, char **argv) { - <A href="Fl_Window.html">Fl_Window</A> *window = new <A href="Fl_Window.html#Fl_Window.Fl_Window">Fl_Window</A>(300,180); - <A href="Fl_Box.html">Fl_Box</A> *box = new <A href="Fl_Box.html#Fl_Box.Fl_Box">Fl_Box</A>(20,40,260,100,"Hello, World!"); - box-><A href="Fl_Widget.html#Fl_Widget.box">box</A>(<A href="common.html#boxtypes">FL_UP_BOX</A>); - box-><A href="Fl_Widget.html#Fl_Widget.labelsize">labelsize</A>(36); - box-><A href="Fl_Widget.html#Fl_Widget.labelfont">labelfont</A>(<A href="drawing.html#fonts">FL_BOLD</A>+<A href="drawing.html#fonts">FL_ITALIC</A>); - box-><A href="Fl_Widget.html#Fl_Widget.labeltype">labeltype</A>(<A href="common.html#labels">FL_SHADOW_LABEL</A>); - window-><A href="Fl_Group.html#Fl_Group.end">end</A>(); - window-><A href="Fl_Window.html#Fl_Window.show">show</A>(argc, argv); - return <A href="Fl.html#Fl.run">Fl::run</A>(); + Fl_Window *window = new Fl_Window(300,180); + Fl_Box *box = new Fl_Box(20,40,260,100,"Hello, World!"); + box->box(FL_UP_BOX); + box->labelsize(36); + box->labelfont(FL_BOLD+FL_ITALIC); + box->labeltype(FL_SHADOW_LABEL); + window->end(); + window->show(argc, argv); + return Fl::run(); } -</PRE></UL> +\endcode <!-- NEED 2in --> <P>After including the required header files, the program then creates a window. All following widgets will automatically be children of this window.</P> -<UL><PRE> -Fl_Window *window = new <A href="Fl_Window.html#Fl_Window">Fl_Window</A>(300,180); -</PRE></UL> +\code +Fl_Window *window = new Fl_Window(300,180); +\endcode -<P>Then we create a box with the "Hello, World!" string in it. FLTK automatically adds +<P>Then we create a box with the "Hello, World!" string in it. FLTK automatically adds the new box to <tt>window</tt>, the current grouping widget.</P> -<UL><PRE> -Fl_Box *box = new <A href="Fl_Box.html#Fl_Box">Fl_Box</A>(20,40,260,100,"Hello, World!"); -</PRE></UL> +\code +Fl_Box *box = new Fl_Box(20,40,260,100,"Hello, World!"); +\endcode <P>Next, we set the type of box and the size, font, and style of the label:</P> -<UL><PRE> -box-><A href="Fl_Widget.html#Fl_Widget.box">box</A>(FL_UP_BOX); -box-><A href=Fl_Widget.html#Fl_Widget.labelsize>labelsize</A>(36); -box-><A href=Fl_Widget.html#Fl_Widget.labelfont>labelfont</A>(FL_BOLD+FL_ITALIC); -box-><A href=Fl_Widget.html#Fl_Widget.labeltype>labeltype</A>(FL_SHADOW_LABEL); -</PRE></UL> +\code +box->box(FL_UP_BOX); +box->labelsize(36); +box->labelfont(FL_BOLD+FL_ITALIC); +box->labeltype(FL_SHADOW_LABEL); +\endcode <P>We tell FLTK that we will not add any more widgets to <tt>window</tt>.</P> -<UL><PRE> -window-><A href=Fl_Group.html#Fl_Group.end>end</A>(); -</PRE></UL> +\code +window->end(); +\endcode <P>Finally, we show the window and enter the FLTK event loop:</P> -<UL><PRE> -window-><A href=Fl_Window.html#Fl_Window.show>show</A>(argc, argv); -return <A href="Fl.html#Fl.run">Fl::run</A>(); -</PRE></UL> +\code +window->show(argc, argv); +return Fl::run(); +\endcode <P>The resulting program will display the window in Figure 2-1. -You can quit the program by closing the window or pressing the +You can quit the program by closing the window or pressing the <KBD>ESC</KBD>ape key.</P> -<P ALIGN="CENTER"><IMG src="hello.C.gif" alt="Hello, World! Window"><BR> -<I>Figure 2-1: The Hello, World! Window</I></P> +\image html hello.C.gif "Figure 2-1: The Hello, World! Window" <H3>Creating the Widgets</H3> <P>The widgets are created using the C++ <TT>new</TT> operator. For most widgets the arguments to the constructor are:</P> -<UL><PRE> +\code Fl_Widget(x, y, width, height, label) -</PRE></UL> +\endcode <P>The <TT>x</TT> and <TT>y</TT> parameters determine where the widget or window is placed on the screen. In FLTK the top left @@ -107,8 +105,8 @@ copy of it - it just uses the pointer.</P> <P>Widgets are commonly ordered into functional groups, which in turn may be grouped again, creating a hierarchy of widgets. FLTK makes it easy to fill groups by automatically adding all widgets -that are created between a <tt>myGroup->begin()</tt> and -<tt>myGroup->end()</tt>. In this example, <tt>myGroup</tt> +that are created between a <tt>myGroup->begin()</tt> and +<tt>myGroup->end()</tt>. In this example, <tt>myGroup</tt> would be the <i>current</i> group.</P> <P>Newly created groups and their derived widgets implicitly call @@ -122,19 +120,19 @@ hierarchies. New widgets can now be added manually using <H3>Get/Set Methods</H3> -<P><tt>box->box(FL_UP_BOX)</tt> sets the type of box the +<P><tt>box->box(FL_UP_BOX)</tt> sets the type of box the Fl_Box draws, changing it from the default of <tt>FL_NO_BOX</tt>, which means that no box is drawn. In our -"Hello, World!" example we use <TT>FL_UP_BOX</TT>, +"Hello, World!" example we use <TT>FL_UP_BOX</TT>, which means that a raised button border will be drawn around the widget. You can learn more about boxtypes in <A href="common.html#boxtypes">Chapter 3</A>.</P> <P>You could examine the boxtype in by doing -<tt>box->box()</tt>. FLTK uses method name overloading to make +<tt>box->box()</tt>. FLTK uses method name overloading to make short names for get/set methods. A "set" method is always of -the form "void name(type)", and a "get" method is always -of the form "type name() const".</P> +the form "void name(type)", and a "get" method is always +of the form "type name() const".</P> <H3>Redrawing After Changing Attributes</H3> @@ -149,6 +147,11 @@ only common exceptions are <tt>value()</tt> which calls <H3>Labels</H3> <P>All widgets support labels. In the case of window widgets, +the label is used for the label in the title bar. Our example +program calls the <TT>labelfont()</TT>,<TT> labelsize</TT>, +and <TT>labeltype()</TT> methods.</P> + +<P>All widgets support labels. In the case of window widgets, the label is used for the label in the title bar. Our example program calls the <A href=Fl_Widget.html#Fl_Widget.labelfont> <TT>labelfont</TT></A>, @@ -203,17 +206,16 @@ write, or when an error condition occurs on a file. They are most often used to monitor network connections (sockets) for data-driven displays.</P> -<P>FLTK applications must periodically check -(<TT>Fl::check()</TT>) or wait (<TT>Fl::wait()</TT>) for events -or use the <A href="Fl.html#Fl.run"><TT>Fl::run()</TT></A> +<P>FLTK applications must periodically check (Fl::check()) +or wait (Fl::wait()) for events or use the Fl::run() method to enter a standard event processing loop. Calling -<TT>Fl::run()</TT> is equivalent to the following code:</P> +Fl::run() is equivalent to the following code:</P> -<UL><PRE> +\code while (Fl::wait()); -</PRE></UL> +\endcode -<P><TT>Fl::run()</TT> does not return until all of the windows +<P>Fl::run() does not return until all of the windows under FLTK control are closed by the user or your program.</P> <H2>Compiling Programs with Standard Compilers</H2> @@ -222,71 +224,64 @@ under FLTK control are closed by the user or your program.</P> tools) you will probably need to tell the compiler where to find the header files. This is usually done using the <TT>-I</TT> option:</P> -<UL><PRE> +\code CC -I/usr/local/include ... gcc -I/usr/local/include ... -</PRE></UL> +\endcode <P>The <TT>fltk-config</TT> script included with FLTK can be used to get the options that are required by your compiler:</P> -<UL><PRE> +\code CC `fltk-config --cxxflags` ... -</PRE></UL> +\endcode <P>Similarly, when linking your application you will need to tell the compiler to use the FLTK library:</P> -<UL><PRE> -CC ... -L/usr/local/lib -lfltk -lXext -lX11 -lm +\code +CC ... -L/usr/local/lib -lfltk -lXext -lX11 -lm gcc ... -L/usr/local/lib -lfltk -lXext -lX11 -lm -</PRE></UL> +\endcode <P>Aside from the "fltk" library, there is also a "fltk_forms" library for the XForms compatibility classes, "fltk_gl" for the OpenGL and GLUT classes, and "fltk_images" for the image file -classes, <A -HREF="Fl_Help_Dialog.html#Fl_Help_Dialog"><CODE>Fl_Help_Dialog</CODE></A> -widget, and system icon support. - -<CENTER><TABLE WIDTH="80%" BORDER="1" CELLPADDING="10" BGCOLOR="#cccccc"> -<TR> - <TD><B>Note:</B> - <P>The libraries are named "fltk.lib", "fltkgl.lib", "fltkforms.lib", +classes, Fl_Help_Dialog widget, and system icon support. + +\note + The libraries are named "fltk.lib", "fltkgl.lib", "fltkforms.lib", and "fltkimages.lib", respectively under Windows. - </TD> -</TR> -</TABLE></CENTER> <P>As before, the <TT>fltk-config</TT> script included with FLTK can be used to get the options that are required by your linker:</P> -<UL><PRE> +\code CC ... `fltk-config --ldflags` -</PRE></UL> +\endcode <!-- NEED 2in --> <P>The forms, GL, and images libraries are included with the "--use-foo" options, as follows: -<UL><PRE> +\code CC ... `fltk-config --use-forms --ldflags` CC ... `fltk-config --use-gl --ldflags` CC ... `fltk-config --use-images --ldflags` CC ... `fltk-config --use-forms --use-gl --use-images --ldflags` -</PRE></UL> +\endcode <P>Finally, you can use the <TT>fltk-config</TT> script to compile a single source file as a FLTK program: -<UL><PRE> +\code fltk-config --compile filename.cpp fltk-config --use-forms --compile filename.cpp fltk-config --use-gl --compile filename.cpp fltk-config --use-images --compile filename.cpp fltk-config --use-forms --use-gl --use-images --compile filename.cpp -</PRE></UL> +\endcode <P>Any of these will create an executable named <TT>filename</TT>. @@ -294,11 +289,10 @@ fltk-config --use-forms --use-gl --use-images --compile filename.cpp <P>In Visual C++ you will need to tell the compiler where to find the FLTK header files. This can be done by selecting -"Settings" from the "Project" menu and then -changing the "Preprocessor" settings under the -"C/C++" tab. You will also need to add the FLTK and -WinSock (WSOCK32.LIB) libraries to the "Link" -settings.</P> +"Settings" from the "Project" menu and then changing the +"Preprocessor" settings under the "C/C++" tab. You will also +need to add the FLTK and WinSock2 (WS2_32.LIB) libraries to +the "Link" settings.</P> <P>You can build your Microsoft Windows applications as Console or WIN32 applications. If you want to use the standard C <TT>main()</TT> @@ -306,7 +300,7 @@ function as the entry point, FLTK includes a <TT>WinMain()</TT> function that will call your <TT>main()</TT> function for you.</P> <P><I>Note: The Visual C++ 5.0 optimizer is known to cause problems with -many programs. We only recommend using the "Favor Small Code" +many programs. We only recommend using the "Favor Small Code" optimization setting.</I> The Visual C++ 6.0 optimizer seems to be much better and can be used with the "optimized for speed" setting.</P> @@ -325,7 +319,7 @@ better and can be used with the "optimized for speed" setting.</P> <LI><A href="enumerations.html">Constants and enumerations</A> are uppercase: <TT>FL_FOO</TT>.</LI> - <LI>All header files start with <TT><FL/...></TT>. + <LI>All header files start with <TT><FL/...></TT>. </LI> </UL> @@ -336,27 +330,20 @@ better and can be used with the "optimized for speed" setting.</P> <P>The proper way to include FLTK header files is:</P> -<UL><PRE> -#include <FL/Fl_xyz.H> -</PRE></UL> - -<CENTER><TABLE BORDER="1" CELLPADDING="10" BGCOLOR="#cccccc"> -<TR> - <TD><B>Note:</B> +\code +#include <FL/Fl_xyz.H> +\endcode - <P>Case <I>is</I> significant on many operating systems, +\note + Case <I>is</I> significant on many operating systems, and the C standard uses the forward slash (/) to separate directories. <i>Do not use any of the following - include lines:</i></P> - - <UL><PRE> - #include <FL\Fl_xyz.H> - #include <fl/fl_xyz.h> - #include <Fl/fl_xyz.h> - </PRE></UL> + include lines:</i> - </TD> -</TR> -</TABLE></CENTER> + \code + #include <FL\Fl_xyz.H> + #include <fl/fl_xyz.h> + #include <Fl/fl_xyz.h> + \endcode */ |
