1999-01-13 22:28:54 +03:00
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<HTML><BODY>
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<HR break>
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<H2><A name=Fl_Button>class Fl_Button</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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<A href=Fl_Widget.html#Fl_Widget>Fl_Widget</A>
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1998-12-29 17:21:17 +03:00
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1999-01-13 22:28:54 +03:00
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+----<B>Fl_Button</B>
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1998-12-29 17:21:17 +03:00
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1999-01-13 22:28:54 +03:00
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+----<A href=Fl_Check_Button.html#Fl_Check_Button>Fl_Check_Button</A>, <A href=Fl_Light_Button.html#Fl_Light_Button>Fl_Light_Button</A>, <A href=Fl_Repeat_Button.html#Fl_Repeat_Button>Fl_Repeat_Button</A>,
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<A href=Fl_Return_Button.html#Fl_Return_Button>Fl_Return_Button</A>, <A href=Fl_Round_Button.html#Fl_Round_Button>Fl_Round_Button</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_Button.H>
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</PRE>
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</UL>
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<H3>Description</H3>
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<P>Buttons generate callbacks when they are clicked by the user. You
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control exactly when and how by changing the values for <TT>type()</TT>
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and <TT>when()</TT>. </P>
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<P>Buttons can also generate callbacks in response to <TT>FL_SHORTCUT</TT>
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events. The button can either have an explicit <A href=#Fl_Button.shortcut>
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<TT>shortcut()</TT></A> value or a letter shortcut can be indicated in
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the <TT>label()</TT> with an ''character before it. For the label
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shortcut it does not matter if <I>Alt</I> is held down, but if you have
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an input field in the same window, the user will have to hold down the <I>
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Alt</I> key so that the input field does not eat the event first as an <TT>
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FL_KEYBOARD</TT> event. </P>
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<H3>Methods</H3>
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<CENTER>
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<TABLE width=90%>
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<TR><TD align=left valign=top>
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<UL>
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<LI><A href=#Fl_Button.Fl_Button>Fl_Button</A></LI>
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<LI><A href=#Fl_Button.~Fl_Button>~Fl_Button</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_Button.clear>clear</A></LI>
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<LI><A href=#Fl_Button.down_box>down_box</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_Button.set>set</A></LI>
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<LI><A href=#Fl_Button.setonly>setonly</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_Button.shortcut>shortcut</A></LI>
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<LI><A href=#Fl_Button.type>type</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_Button.value>value</A></LI>
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<LI><A href=#Fl_Button.when>when</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_Button.Fl_Button>Fl_Button::Fl_Button(int x, int y, int
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w, int h, const char *label = 0)</A></H4>
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The constructor creates the button using the position, size, and
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label.
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<H4><A name=Fl_Button.~Fl_Button>Fl_Button::~Fl_Button(void)</A></H4>
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The destructor removed the button.
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<H4><A name=Fl_Button.clear>int Fl_Button::clear()</A></H4>
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Same as <TT>value(0)</TT>.
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<H4><A name=Fl_Button.down_box>Fl_Boxtype Fl_Button::down_box() const
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<BR> void Fl_Button::down_box(Fl_Boxtype bt)</A></H4>
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The first form returns the current down box type, which is drawn when <TT>
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value()</TT> is non-zero.
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<P>The second form sets the down box type. The default value of 0
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causes FLTK to figure out the correct matching down version of <TT>box()</TT>
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. </P>
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<H4><A name=Fl_Button.set>int Fl_Button::set()</A></H4>
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Same as <TT>value(1)</TT>.
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<H4><A name=Fl_Button.setonly>void Fl_Button::setonly()</A></H4>
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Turns on this button and turns off all other radio buttons in the
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group (calling <TT>value(1)</TT> or <TT>set()</TT> does not do this).
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<H4><A name=Fl_Button.shortcut>ulong Fl_Button::shortcut() const
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<BR> void Fl_Button::shortcut(ulong key)</A></H4>
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The first form returns the current shortcut key for the button.
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<P>The second form sets the shortcut key to <TT>key</TT>. Setting this
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overrides the use of ''in the <TT>label()</TT>. The value is a bitwise
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OR of a key and a set of shift flags, for example <CODE>FL_ALT | 'a'</CODE>
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, <CODE>FL_ALT | (FL_F + 10)</CODE>, or just <CODE>'a'</CODE>. A value
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of 0 disables the shortcut. </P>
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<P>The key can be any value returned by <A href=functions.html#event_key>
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<TT>Fl::event_key()</TT></A>, but will usually be an ASCII letter. Use
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a lower-case letter unless you require the shift key to be held down. </P>
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<P>The shift flags can be any set of values accepted by <A href=events.html#event_state>
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<TT>Fl::event_state()</TT></A>. If the bit is on that shift key must
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be pushed. Meta, Alt, Ctrl, and Shift must be off if they are not in
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the shift flags (zero for the other bits indicates a "don't care"
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setting). </P>
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<H4><A name=Fl_Button.type>uchar Fl_Button::type() const
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<BR> void Fl_Button::type(uchar t)</A></H4>
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The first form of <TT>type()</TT> returns the current button type,
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which can be one of:
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<UL>
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<LI><CODE>0</CODE>: The value is unchanged. </LI>
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<LI><CODE>FL_TOGGLE_BUTTON</CODE>: The value is inverted. </LI>
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<LI><CODE>FL_RADIO_BUTTON</CODE>: The value is set to 1, and all other
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buttons in the current group with <CODE>type() == FL_RADIO_BUTTON</CODE>
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are set to zero. </LI>
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</UL>
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The second form sets the button type to <TT>t</TT>.
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<H4><A name=Fl_Button.value>char Fl_Button::value() const
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<BR> int Fl_Button::value(int)</A></H4>
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The first form returns the current value (0 or 1). The second form
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sets the current value.
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<H4><A name=Fl_Button.when>Fl_When Fl_Widget::when() const
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<BR> void Fl_Widget::when(Fl_When w)</A></H4>
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Controls when callbacks are done. The following values are useful,
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the default value is <CODE>FL_WHEN_RELEASE</CODE>:
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<UL>
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<LI><CODE>0</CODE>: The callback is not done, instead changed() is
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turned on. </LI>
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<LI><CODE>FL_WHEN_RELEASE</CODE>: The callback is done after the user
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successfully clicks the button, or when a shortcut is typed. </LI>
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<LI><CODE>FL_WHEN_CHANGED </CODE>: The callback is done each time the
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value() changes (when the user pushes and releases the button, and as
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the mouse is dragged around in and out of the button). </LI>
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</UL>
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</BODY></HTML>
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