7e8ec10e6d
Add Fl_File_Chooser::directory_label, filename_label, and filter_label static string pointers for labels (allows for I18N of the file chooser). Fix typos in other docos. git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@2098 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
450 lines
18 KiB
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450 lines
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<HTML><BODY>
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<!-- NEW PAGE -->
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<H2><A name=Fl_Widget>class Fl_Widget</A></H2>
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<HR>
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<H3>Class Hierarchy</H3>
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<UL>
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<PRE>
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<B>Fl_Widget</B>
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+----<A href=Fl_Box.html#Fl_Box>Fl_Box</A>, <A href=Fl_Browser_.html#Fl_Browser_>Fl_Browser_</A>, <A href=Fl_Button.html#Fl_Button>Fl_Button</A>, <A href=Fl_Chart.html#Fl_Chart>Fl_Chart</A>, <A href=Fl_Clock.html#Fl_Clock>Fl_Clock</A>,
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<A href=Fl_Free.html#Fl_Free>Fl_Free</A>, <A href=Fl_Group.html#Fl_Group>Fl_Group</A>, <A href=Fl_Input_.html#Fl_Input_>Fl_Input_</A>, <A href=Fl_Menu_.html#Fl_Menu_>Fl_Menu_</A>, <A href=Fl_Positioner.html#Fl_Positioner>Fl_Positioner</A>,
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<A HREF="Fl_Progress.html">Fl_Progress</A>, <A href=Fl_Timer.html#Fl_Timer>Fl_Timer</A>, <A href=Fl_Valuator.html#Fl_Valuator>Fl_Valuator</A>
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</PRE>
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</UL>
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<H3>Include Files</H3>
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<UL>
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<PRE>
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#include <FL/Fl_Widget.H>
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</PRE>
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</UL>
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<H3>Description</H3>
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<TT>Fl_Widget</TT> is the base class for all widgets in FLTK. You can't
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create one of these because the constructor is not public. However you
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can <A href="subclassing.html#subclassing">subclass</A> it.
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<P>All "property" accessing methods, such as <TT>color()</TT>, <TT>
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parent()</TT>, or <TT>argument()</TT> are implemented as trivial inline
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functions and thus are as fast and small as accessing fields in a
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structure. Unless otherwise noted, the property setting methods such as <TT>
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color(n)</TT> or <TT>label(s)</TT> are also trivial inline functions,
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even if they change the widget's appearance. It is up to the user code
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to call <TT>redraw()</TT> after these. </P>
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<H3>Methods</H3>
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<CENTER>
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<TABLE width=90% summary="Fl_Widget methods.">
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<TR><TD align=left valign=top>
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<UL>
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<LI><A href=#Fl_Widget.Fl_Widget>Fl_Widget</A></LI>
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<LI><A href=#Fl_Widget.~Fl_Widget>~Fl_Widget</A></LI>
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<LI><A href=#Fl_Widget.activate>activate</A></LI>
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<LI><A href=#Fl_Widget.active>active</A></LI>
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<LI><A href=#Fl_Widget.active_r>active_r</A></LI>
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<LI><A href=#Fl_Widget.align>align</A></LI>
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<LI><A href=#Fl_Widget.argument>argument</A></LI>
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<LI><A href=#Fl_Widget.box>box</A></LI>
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<LI><A href=#Fl_Widget.callback>callback</A></LI>
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</UL>
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</TD><TD align=left valign=top>
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<UL>
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<LI><A href=#Fl_Widget.changed>changed</A></LI>
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<LI><A href=#Fl_Widget.clear_changed>clear_changed</A></LI>
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<LI><A href=#Fl_Widget.color>color</A></LI>
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<LI><A href=#Fl_Widget.contains>contains</A></LI>
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<LI><A href=#Fl_Widget.damage>damage</A></LI>
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<LI><A href=#Fl_Widget.deactivate>deactivate</A></LI>
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<LI><A href=#Fl_Widget.default_callback>default_callback</A></LI>
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<LI><A href=#Fl_Widget.deimage>deimage</A></LI>
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<LI><A href=#Fl_Widget.do_callback>do_callback</A></LI>
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<LI><A href=#Fl_Widget.h>h</A></LI>
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</UL>
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</TD><TD align=left valign=top>
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<UL>
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<LI><A href=#Fl_Widget.handle>handle</A></LI>
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<LI><A href=#Fl_Widget.hide>hide</A></LI>
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<LI><A href=#Fl_Widget.image>image</A></LI>
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<LI><A href=#Fl_Widget.inside>inside</A></LI>
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<LI><A href=#Fl_Widget.label>label</A></LI>
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<LI><A href=#Fl_Widget.labelcolor>labelcolor</A></LI>
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<LI><A href=#Fl_Widget.labelfont>labelfont</A></LI>
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<LI><A href=#Fl_Widget.labelsize>labelsize</A></LI>
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<LI><A href=#Fl_Widget.labeltype>labeltype</A></LI>
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<LI><A href=#Fl_Widget.output>output</A></LI>
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</UL>
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</TD><TD align=left valign=top>
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<UL>
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<LI><A href=#Fl_Widget.parent>parent</A></LI>
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<LI><A href=#Fl_Widget.position>position</A></LI>
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<LI><A href=#Fl_Widget.redraw>redraw</A></LI>
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<LI><A href=#Fl_Widget.resize>resize</A></LI>
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<LI><A href=#Fl_Widget.selection_color>selection_color</A></LI>
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<LI><A href=#Fl_Widget.set_changed>set_changed</A></LI>
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<LI><A href=#Fl_Widget.show>show</A></LI>
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<LI><A href=#Fl_Widget.size>size</A></LI>
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<LI><A href=#Fl_Widget.take_focus>take_focus</A></LI>
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<LI><A href=#Fl_Widget.takesevents>takesevents</A></LI>
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</UL>
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</TD><TD align=left valign=top>
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<UL>
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<LI><A href="#Fl_Widget.tooltip">tooltip</A></LI>
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<LI><A href=#Fl_Widget.type>type</A></LI>
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<LI><A href=#Fl_Widget.user_data>user_data</A></LI>
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<LI><A href=#Fl_Widget.visible>visible</A></LI>
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<LI><A href=#Fl_Widget.visible_r>visible_r</A></LI>
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<LI><A href=#Fl_Widget.w>w</A></LI>
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<LI><A href=#Fl_Widget.when>when</A></LI>
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<LI><A href=#Fl_Widget.window>window</A></LI>
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<LI><A href=#Fl_Widget.x>x</A></LI>
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<LI><A href=#Fl_Widget.y>y</A></LI>
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</UL>
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</TD></TR>
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</TABLE>
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</CENTER>
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<H4><A NAME="Fl_Widget.Fl_Widget">protected Fl_Widget::Fl_Widget(int x, int y, int w, int h, const char*
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label=0);</A></H4>
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<P>Creates a widget at the given position and size. The
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<TT>Fl_Widget</TT> is a protected constructor, but all derived
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widgets have a matching public constructor. It takes a value for
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<TT>x()</TT>, <TT>y()</TT>, <TT>w()</TT>, <TT>h()</TT>, and an
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optional value for <TT>label()</TT>.
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<H4><A NAME="Fl_Widget.~Fl_Widget">virtual Fl_Widget::~Fl_Widget();</A></H4>
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<P>Destroys the widget. Destroying single widgets is not very
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common, and it is your responsibility to either
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<TT>remove()</TT> them from any enclosing group or destroy that
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group <I>immediately</I> after destroying the children. You
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almost always want to destroy the parent group instead which
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will destroy all of the child widgets and groups in that group.
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<H4><A NAME="Fl_Widget.type">uchar Fl_Widget::type() const;</A></H4>
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<P>Returns the widget type value, which is used for Forms
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compatability and to simulate RTTI.
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<H4><A name=Fl_Widget.x>short Fl_Widget::x() const</A>
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<BR><A name=Fl_Widget.y>short Fl_Widget::y() const</A>
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<BR><A name=Fl_Widget.w>short Fl_Widget::w() const</A>
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<BR><A name=Fl_Widget.h>short Fl_Widget::h() const</A></H4>
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<P>Returns the position of the upper-left corner of the widget
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in its enclosing Fl_Window (<I>not</I> its parent if that is not
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an Fl_Window), and its width and height.
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<H4><A name=Fl_Widget.resize>virtual void
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Fl_Widget::resize(int x, int y, int w, int h)</A>
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<BR><A name=Fl_Widget.position>void Fl_Widget::position(short x, short y)</A>
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<BR><A name=Fl_Widget.size>void Fl_Widget::size(short w, short h)</A></H4>
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<P>Change the size or position of the widget. This is a virtual
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function so that the widget may implement its own handling of
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resizing. The default version does <I>not</I> call the
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<TT>redraw()</TT> method, but instead relies on the parent
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widget to do so because the parent may know a faster way to
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update the display, such as scrolling from the old position.
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<P><TT>position(x,y)</TT> is a shortcut for <TT>resize(x,y,w(),h())</TT>,
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and <TT>size(w,h)</TT> is a shortcut for <TT>resize(x(),y(),w,h)</TT>.</P>
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<H4><A name=Fl_Widget.window>Fl_Window* Fl_Widget::window() const;</A></H4>
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<P>Returns a pointer to the primary <A
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href=Fl_Window.html#Fl_Window><TT>Fl_Window</TT></A> widget.
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Returns <TT>NULL</TT> if no window is associated with this
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widget. Note: for an <TT>Fl_Window</TT> widget, this returns
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its <I>parent</I> window (if any), not <I>this</I> window.
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<H4><A name=Fl_Widget.box>Fl_Boxtype Fl_Widget::box() const
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<BR> void Fl_Widget::box(Fl_Boxtype)</A></H4>
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<P>Gets or sets the box type for the widget, which identifies a
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routine that draws the background of the widget. See <A
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href="common.html#boxtypes">Box Types</A> for the available
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types. The default depends on the widget, but is usually
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<TT>FL_NO_BOX</TT> or <TT>FL_UP_BOX</TT>.
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<H4><A name=Fl_Widget.color>Fl_Color Fl_Widget::color() const
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<BR>void Fl_Widget::color(Fl_Color)
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<BR>void Fl_Widget::color(Fl_Color, Fl_Color)</A></H4>
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<P>Gets or sets the background color of the widget. The color is
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passed to the box routine. The color is either an index into an
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internal table of RGB colors or an RGB color value generated
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using <TT>fl_rgb_color()</TT>. The default for most widgets is
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<TT>FL_GRAY</TT>. See the <A
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href=enumerations.html#Enumerations>enumeration list</A> for
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predefined colors. Use <A
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href="Fl.html#Fl.set_color"><TT>Fl::set_color()</TT></A> to
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redefine colors.
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<P>The two color form sets both the background and selection
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colors. See the description of the <A
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HREF="#Fl_Widget.selection_color"><TT>selection_color()</TT></A>
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method for more information.
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<H4><A name=Fl_Widget.selection_color>Fl_Color
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Fl_Widget::selection_color() const
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<BR>void Fl_Widget::selection_color(Fl_Color)</A></H4>
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<P>Gets or sets the selection color, which is defined for Forms
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compatibility and is usually used to color the widget when it is
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selected, although some widgets use this color for other
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purposes. You can set both colors at once with
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<TT>color(a,b)</TT>.
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<H4><A name=Fl_Widget.label>const char* Fl_Widget::label() const
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<BR> void Fl_Widget::label(const char*)</A></H4>
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<P>Get or set the current label pointer. The label is shown
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somewhere on or next to the widget. The passed pointer is stored
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unchanged in the widget (the string is <I>not</I> copied), so if
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you need to set the label to a formatted value, make sure the
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buffer is <TT>static</TT>, global, or allocated.
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<H4><A name=Fl_Widget.labeltype>void Fl_Widget::label(Fl_Labeltype,
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const char*)
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<BR> uchar Fl_Widget::labeltype() const
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<BR> void Fl_Widget::labeltype(Fl_Labeltype)</A></H4>
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<P>Gets or sets the <A
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href="common.html#labeltypes"><TT>labeltype</TT></A> which
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identifies the function that draws the label of the widget. This
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is generally used for special effects such as embossing or for
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using the <TT>label()</TT> pointer as another form of data such
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as an icon. The value <TT>FL_NORMAL_LABEL</TT> prints the label
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as plain text.
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<H4><A name=Fl_Widget.align>Fl_Align Fl_Widget::align() const
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<BR> void Fl_Widget::align(Fl_Align)</A></H4>
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<P>Gets or sets the label alignment, which controls how the
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label is displayed next to or inside the widget. The default
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value is <TT>FL_ALIGN_CENTER</TT>, which centers the label
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inside the widget. The value can be any of these constants
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bitwise-OR'd together:
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<UL>
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<LI><TT>FL_ALIGN_BOTTOM</TT></LI>
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<LI><TT>FL_ALIGN_CENTER</TT></LI>
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<LI><TT>FL_ALIGN_CLIP</TT></LI>
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<LI><TT>FL_ALIGN_INSIDE</TT></LI>
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<LI><TT>FL_ALIGN_LEFT</TT></LI>
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<LI><TT>FL_ALIGN_RIGHT</TT></LI>
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<LI><TT>FL_ALIGN_TEXT_OVER_IMAGE</TT></LI>
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<LI><TT>FL_ALIGN_TOP</TT></LI>
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<LI><TT>FL_ALIGN_WRAP</TT></LI>
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</UL>
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<H4><A name=Fl_Widget.labelcolor>Fl_Color Fl_Widget::labelcolor() const
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<BR> void Fl_Widget::labelcolor(Fl_Color)</A></H4>
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<P>Gets or sets the label color. The default color is <TT>FL_BLACK</TT>.
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<H4><A name=Fl_Widget.labelfont>Fl_Font Fl_Widget::labelfont() const
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<BR> void Fl_Widget::labelfont(Fl_Font)</A></H4>
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<P>Gets or sets the font to use. Fonts are identified by small
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8-bit indexes into a table. See the <A
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href=enumerations.html#Enumerations> enumeration list</A> for
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predefined typefaces. The default value uses a Helvetica
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typeface (Arial for Microsoft® Windows®). The function
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<A href="Fl.html#Fl.set_font"><TT>Fl::set_font()</TT></A> can
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define new typefaces.
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<H4><A name=Fl_Widget.labelsize>uchar Fl_Widget::labelsize() const
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<BR>void Fl_Widget::labelsize(uchar)</A></H4>
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<P>Gets or sets the font size in pixels. The default size is 14
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pixels.
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<H4><A name=Fl_Widget.callback>typedef void (Fl_Callback)(Fl_Widget*, void*)
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<BR>Fl_Callback* Fl_Widget::callback() const
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<BR>void Fl_Widget::callback(Fl_Callback*, void* = 0)
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<BR>void Fl_Widget::callback(void (*)(Fl_Widget*, long), long = 0)
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<BR>void Fl_Widget::callback(void (*)(Fl_Widget*))</A></H4>
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<P>Gets or sets the current callback function for the widget.
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Each widget has a single callback.
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<H4><A name=Fl_Widget.user_data>void* Fl_Widget::user_data() const
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<BR>void Fl_Widget::user_data(void*)</A></H4>
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<P>Gets or sets the current user data (<TT>void *</TT>) argument
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that is passed to the callback function.
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<H4><A name=Fl_Widget.argument>long Fl_Widget::argument() const
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<BR> void Fl_Widget::argument(long)</A></H4>
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<P>Gets or sets the current user data (<TT>long</TT>) argument
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that is passed to the callback function.
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<CENTER><TABLE BORDER="1" CELLPADDING="5" CELLSPACING="0" BGCOLOR="#cccccc">
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<TR>
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<TD><B>Note:</B>
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<P>This is implemented by casting the <TT>long</TT>
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value to a <TT>void *</TT> and may not be portable on
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some machines.
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</TD>
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</TR>
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</TABLE></CENTER>
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<H4><A name=Fl_Widget.do_callback>void Fl_Widget::do_callback()
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<BR> void Fl_Widget::do_callback(Fl_Widget*, void* = 0)
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<BR> void Fl_Widget::do_callback(Fl_Widget*, long)</A></H4>
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<P>Causes a widget to invoke its callback function, optionally
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with arbitrary arguments.
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<H4><A name=Fl_Widget.changed>int Fl_Widget::changed() const</A>
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<BR><A name=Fl_Widget.set_changed>void Fl_Widget::set_changed()</A>
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<BR><A name=Fl_Widget.clear_changed>void Fl_Widget::clear_changed()</A></H4>
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<P><TT>Fl_Widget::changed()</TT> is a flag that is turned on
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when the user changes the value stored in the widget. This is
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only used by subclasses of <TT>Fl_Widget</TT> that store values,
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but is in the base class so it is easier to scan all the widgets
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in a panel and <TT> do_callback()</TT> on the changed ones in
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response to an "OK" button.
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<P>Most widgets turn this flag off when they do the callback, and when
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the program sets the stored value. </P>
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<H4><A name=Fl_Widget.when>Fl_When Fl_Widget::when() const
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<BR> void Fl_Widget::when(Fl_When)</A></H4>
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<P><TT>Fl_Widget::when()</TT> is a set of bitflags used by
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subclasses of <TT> Fl_Widget</TT> to decide when to do the
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callback. If the value is zero then the callback is never
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done. Other values are described in the individual widgets.
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This field is in the base class so that you can scan a panel and
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<TT>do_callback()</TT> on all the ones that don't do their own
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callbacks in response to an "OK" button.
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<H4><A name=Fl_Widget.default_callback>static void
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Fl_Widget::default_callback(Fl_Widget*, void*)</A></H4>
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<P>The default callback, which puts a pointer to the widget on
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the queue returned by <A
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href="Fl.html#Fl.readqueue"><TT>Fl::readqueue()</TT></A>. You
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may want to call this from your own callback.
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<H4><A name=Fl_Widget.visible>int Fl_Widget::visible() const</A><BR>
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<A name=Fl_Widget.visible_r>int Fl_Widget::visible_r() const</A><BR>
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<A name=Fl_Widget.show>void Fl_Widget::show()</A><BR>
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<A name=Fl_Widget.hide>void Fl_Widget::hide()</A></H4>
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<P>An invisible widget never gets redrawn and does not get
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events. The <TT>visible()</TT> method returns true if the
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widget is set to be visible.The <TT>visible_r()</TT> method
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returns true if the widget and all of its parents are visible. A
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widget is only visible if <TT>visible()</TT> is true on it
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<I>and all of its parents</I>.
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<P>Changing it will send <TT>FL_SHOW</TT> or <TT>FL_HIDE</TT>
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events to the widget. <I>Do not change it if the parent is not
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visible, as this will send false <TT>FL_SHOW</TT> or <TT>FL_HIDE</TT>
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events to the widget</I>. <TT>redraw()</TT> is called if necessary on
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this or the parent.
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<H4><A name=Fl_Widget.active>int Fl_Widget::active() const</A><BR>
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<A name=Fl_Widget.active_r>int Fl_Widget::active_r() const</A></BR>
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<A name=Fl_Widget.activate>void Fl_Widget::activate()</A></BR>
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<A name=Fl_Widget.deactivate>void Fl_Widget::deactivate()</A></H4>
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<P><TT>Fl_Widget::active()</TT> returns whether the widget is
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active. <TT>Fl_Widget::active_r()</TT> returns whether the
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widget and all of its parents are active. An inactive widget
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does not get any events, but it does get redrawn. A widget is
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only active if <TT>active()</TT> is true on it <I>and all of its
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parents</I>.
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<P>Changing this value will send <TT>FL_ACTIVATE</TT> or <TT>
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FL_DEACTIVATE</TT> to the widget if <tt>active_r()</tt> is true.
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<P>Currently you cannot deactivate <TT>Fl_Window</TT> widgets. </P>
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<H4><A name=Fl_Widget.output>int Fl_Widget::output() const</A><BR>
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<A name=Fl_Widget.set_output>void Fl_Widget::set_output()</A></BR>
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<A name=Fl_Widget.clear_output>void Fl_Widget::clear_output()</A></H4>
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<P><tt>output()</tt> means the same as <tt>!active()</tt> except
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it does not change how the widget is drawn. The widget will not
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receive any events. This is useful for making scrollbars or
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buttons that work as displays rather than input devices.
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<H4><A name=Fl_Widget.takesevents>int Fl_Widget::takesevents() const</A></H4>
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<P>This is the same as <TT>(active() && !output()
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&& visible())</TT> but is faster.
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<H4><A name=Fl_Widget.redraw>void Fl_Widget::redraw()</A></H4>
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<P>Marks the widget as needing its <A
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HREF="subclassing.html#draw"><TT>draw()</TT></A> routine called.
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<H4><A name=Fl_Widget.damage>uchar Fl_Widget::damage() const</A></H4>
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<P>Non-zero if <A
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HREF="subclassing.html#draw"><TT>draw()</TT></A> needs to be
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called. The damage value is actually a bit field that the widget
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subclass can use to figure out what parts to draw.
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<H4><A name=Fl_Widget.parent>Fl_Group *Fl_Widget::parent() const</A></H4>
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<P>Returns a pointer to the parent widget. Usually this is a <A
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href=Fl_Group.html#Fl_Group> <TT>Fl_Group</TT></A> or <A
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HREF="Fl_Window.html#Fl_Window"><tt>Fl_Window</tt></a>. Returns
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<tt>NULL</tt> if the widget has no parent.
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<h4><a name="Fl_Widget.contains">int Fl_Widget::contains(Fl_Widget* b) const</A></H4>
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<P>Returns 1 if <TT>b</TT> is a child of this widget, or is
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equal to this widget. Returns 0 if <TT>b</TT> is <TT>NULL</TT>.
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<H4><A name=Fl_Widget.inside>int Fl_Widget::inside(const Fl_Widget* a)
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const</A></H4>
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<P>Returns 1 if this widget is a child of <TT>a</TT>, or is
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equal to <TT>a</TT>. Returns 0 if <TT>a</TT> is <TT>NULL</TT>.
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<H4><A name=Fl_Widget.take_focus>int Fl_Widget::take_focus()</A></H4>
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Tries to make this widget be the <TT>Fl::focus()</TT> widget, by first
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sending it an <TT>FL_FOCUS</TT> event, and if it returns non-zero,
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setting <TT>Fl::focus()</TT> to this widget. You should use this
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method to assign the focus to an widget. Returns true if the widget
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accepted the focus.
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<H4><A name="Fl_Widget.deimage">Fl_Image* Fl_Widget::deimage()</A><BR>
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void Fl_Widget::deimage(Fl_Image* a)<BR>
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void Fl_Widget::deimage(Fl_Image& a)</H4>
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<P>Gets or sets the image to use as part of the widget label.
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This image is used when drawing the widget in the inactive
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state.
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<H4><A name="Fl_Widget.image">Fl_Image* Fl_Widget::image()</A><BR>
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void Fl_Widget::image(Fl_Image* a)<BR>
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void Fl_Widget::image(Fl_Image& a)</H4>
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<P>Gets or sets the image to use as part of the widget label.
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This image is used when drawing the widget in the active state.
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<H4><A name="Fl_Widget.tooltip">const char *Fl_Widget::tooltip()<BR>
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void Fl_Widget::tooltip(const char *t)</A></H4>
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<P>Gets or sets a string of text to display in a popup tooltip
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window when the user hovers the mouse over the widget. The
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string is <I>not</I> copied, so make sure any formatted string
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is stored in a <TT>static</TT>, global, or allocated buffer.
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<H4><A name="Fl_Widget.handle">virtual int Fl_Widget::handle(int event)</A></H4>
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<P>Handles the specified event. You normally don't call this
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method directly, but instead let FLTK do it when the user
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interacts with the widget.
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