diff options
Diffstat (limited to 'documentation/common.html')
| -rw-r--r-- | documentation/common.html | 672 |
1 files changed, 0 insertions, 672 deletions
diff --git a/documentation/common.html b/documentation/common.html deleted file mode 100644 index 6462bc24f..000000000 --- a/documentation/common.html +++ /dev/null @@ -1,672 +0,0 @@ -<HTML> -<HEAD> - <TITLE>3 - Common Widgets and Attributes</TITLE> -</HEAD> -<BODY> - -<H1 ALIGN="RIGHT"><A NAME="common">3 - Common Widgets and Attributes</A></H1> - -<P>This chapter describes many of the widgets that are provided -with FLTK and covers how to query and set the standard -attributes.</P> - -<H2>Buttons</H2> - -<P>FLTK provides many types of buttons:</P> - -<UL> - - <LI><A HREF="Fl_Button.html"><TT>Fl_Button</TT></A> - A - standard push button.</LI> - - <LI><A HREF="Fl_Check_Button.html"><TT>Fl_Check_Button</TT></A> - - A button with a check box.</LI> - - <LI><A HREF="Fl_Light_Button.html"><TT>Fl_Light_Button</TT></A> - - A push button with a light.</LI> - - <LI><A HREF="Fl_Repeat_Button.html"><TT>Fl_Repeat_Button</TT></A> - - A push button that repeats when held.</LI> - - <LI><A HREF="Fl_Return_Button.html"><TT>Fl_Return_Button</TT></A> - - A push button that is activated by the <KBD>Enter</KBD> key.</LI> - - <LI><A HREF="Fl_Round_Button.html"><TT>Fl_Round_Button</TT></A> - - A button with a radio circle.</LI> - -</UL> - -<P ALIGN="CENTER"><IMG SRC="buttons.gif" ALT="FLTK Buttons"><BR> -Figure 3-1: FLTK Button Widgets</P> - -<P>All of these buttons just need the corresponding -<TT><FL/Fl_xyz_Button.H></TT> header file. The constructor -takes the bounding box of the button and optionally a label -string:</P> - -<UL><PRE> -Fl_Button *button = new Fl_Button(x, y, width, height, "label"); -Fl_Light_Button *lbutton = new Fl_Light_Button(x, y, width, height); -Fl_Round_Button *rbutton = new Fl_Round_Button(x, y, width, height, "label"); -</PRE></UL> - -<P>Each button has an associated -<A href="Fl_Button.html#Fl_Button.type"><TT>type()</TT></A> -which allows it to behave as a push button, toggle button, or -radio button:</P> - -<UL><PRE> -button->type(FL_NORMAL_BUTTON); -lbutton->type(FL_TOGGLE_BUTTON); -rbutton->type(FL_RADIO_BUTTON); -</PRE></UL> - -<P>For toggle and radio buttons, the -<A href="Fl_Button.html#Fl_Button.value"><TT>value()</TT></A> -method returns the current button state (0 = off, 1 = on). The -<A href="Fl_Button.html#Fl_Button.set"><TT>set()</TT></A> and -<A href="Fl_Button.html#Fl_Button.clear"><TT>clear()</TT></A> -methods can be used on toggle buttons to turn a toggle button -on or off, respectively. Radio buttons can be turned on with -the -<A href="Fl_Button.html#Fl_Button.setonly"><TT>setonly()</TT></A> -method; this will also turn off other radio buttons in the same -group.</P> - -<H2>Text</H2> - -<P>FLTK provides several text widgets for displaying and receiving text:</P> - -<UL> - - <LI><A HREF="Fl_Input.html"><TT>Fl_Input</TT></A> - A - one-line text input field.</LI> - - <LI><A HREF="Fl_Output.html"><TT>Fl_Output</TT></A> - A - one-line text output field.</LI> - - <LI><A HREF="Fl_Multiline_Input.html"><TT>Fl_Multiline_Input</TT></A> - - A multi-line text input field. </LI> - - <LI><A HREF="Fl_Multiline_Output.html"><TT>Fl_Multiline_Output</TT></A> - - A multi-line text output field.</LI> - - <LI><A HREF="Fl_Text_Display.html"><TT>Fl_Text_Display</TT></A> - - A multi-line text display widget.</LI> - - <LI><A HREF="Fl_Text_Editor.html"><TT>Fl_Text_Editor</TT></A> - - A multi-line text editing widget. </LI> - - <LI><A HREF="Fl_Help_View.html"><TT>Fl_Help_View</TT></A> - A - HTML text display widget.</LI> - -</UL> - -<P>The <TT>Fl_Output</TT> and <TT>Fl_Multiline_Output</TT> -widgets allow the user to copy text from the output field but -not change it.</P> - -<P>The <A href="Fl_Input.html#Fl_Input.value"><TT>value()</TT></A> -method is used to get or set the string that is displayed:</P> - -<UL><PRE> -Fl_Input *input = new Fl_Input(x, y, width, height, "label"); -input->value("Now is the time for all good men..."); -</PRE></UL> - -<P>The string is copied to the widget's own storage when you set -the <tt>value()</tt> of the widget.</P> - -<P>The <TT>Fl_Text_Display</TT> and <TT>Fl_Text_Editor</TT> -widgets use an associated <TT>Fl_Text_Buffer</TT> class for the -value, instead of a simple string.</P> - -<!-- NEED 4in --> - -<H2>Valuators</H2> - -<P>Unlike text widgets, valuators keep track of numbers instead of -strings. FLTK provides the following valuators:</P> - -<UL> - - <LI><A HREF="Fl_Counter.html"><TT>Fl_Counter</TT></A> - A widget with arrow buttons that shows the - current value. </LI> - - <LI><A HREF="Fl_Dial.html"><TT>Fl_Dial</TT></A> - A round knob. </LI> - - <LI><A HREF="Fl_Roller.html"><TT>Fl_Roller</TT></A> - An SGI-like dolly widget. </LI> - - <LI><A HREF="Fl_Scrollbar.html"><TT>Fl_Scrollbar</TT></A> - A standard scrollbar widget. </LI> - - <LI><A HREF="Fl_Slider.html"><TT>Fl_Slider</TT></A> - A scrollbar with a knob. </LI> - - <LI><A HREF="Fl_Value_Slider.html"><TT>Fl_Value_Slider</TT></A> - A slider that shows the current value. </LI> - -</UL> - -<P ALIGN="CENTER"><IMG SRC="valuators.gif" ALT="FLTK Valuators"><BR> -<I>Figure 3-2: FLTK valuator widgets</I></P> - -<P>The <A href="Fl_Valuator.html#Fl_Valuator.value"><TT>value()</TT></A> -method gets and sets the current value of the widget. The -<A href="Fl_Valuator.html#Fl_Valuator.minimum"><TT>minimum()</TT></A> -and <A href="Fl_Valuator.html#Fl_Valuator.maximum"><TT>maximum()</TT></A> -methods set the range of values that are reported by the -widget.</P> - -<!-- NEED 5in --> - -<H2>Groups</H2> - -<P>The <TT>Fl_Group</TT> widget class is used as a general -purpose "container" widget. Besides grouping radio -buttons, the groups are used to encapsulate windows, tabs, and -scrolled windows. The following group classes are available -with FLTK:</P> - -<UL> - - <LI><A HREF="Fl_Double_Window.html"><TT>Fl_Double_Window</TT></A> - A double-buffered window on the screen. </LI> - - <LI><A HREF="Fl_Gl_Window.html"><TT>Fl_Gl_Window</TT></A> - An OpenGL window on the screen. </LI> - - <LI><A HREF="Fl_Group.html"><TT>Fl_Group</TT></A> - The base container class; can be used to group - any widgets together. </LI> - - <LI><A HREF="Fl_Pack.html"><TT>Fl_Pack</TT></A> - A collection of widgets that are packed into the group area.</LI> - - <LI><A HREF="Fl_Scroll.html"><TT>Fl_Scroll</TT></A> - A scrolled window area. </LI> - - <LI><A HREF="Fl_Tabs.html"><TT>Fl_Tabs</TT></A> - Displays child widgets as tabs. </LI> - - <LI><A HREF="Fl_Tile.html"><TT>Fl_Tile</TT></A> - A tiled window area.</LI> - - <LI><A HREF="Fl_Window.html"><TT>Fl_Window</TT></A> - A window on the screen. </LI> - -</UL> - -<H2>Setting the Size and Position of Widgets</H2> - -<P>The size and position of widgets is usually set when you -create them. You can access them with the <tt>x()</tt>, -<tt>y()</tt>, <tt>w()</tt>, and <tt>h()</tt> methods.</P> - -<P>You can change the size and position by using the -<TT>position()</TT>, <TT> resize()</TT>, and <TT>size()</TT> -methods:</P> - -<UL><PRE> -button->position(x, y); -group->resize(x, y, width, height); -window->size(width, height); -</PRE></UL> - -<P>If you change a widget's size or position after it is -displayed you will have to call <tt>redraw()</tt> on the -widget's parent.</P> - -<H2><A NAME="colors">Colors</A></H2> - -<P>FLTK stores the colors of widgets as an 32-bit unsigned -number that is either an index into a color palette of 256 -colors or a 24-bit RGB color. The color palette is <i>not</i> -the X or WIN32 colormap, but instead is an internal table with -fixed contents.</P> - -<P>There are symbols for naming some of the more common colors:</P> - -<UL> - <LI><TT>FL_BLACK</TT></LI> - - <LI><TT>FL_RED</TT></LI> - - <LI><TT>FL_GREEN</TT></LI> - - <LI><TT>FL_YELLOW</TT></LI> - - <LI><TT>FL_BLUE</TT></LI> - - <LI><TT>FL_MAGENTA</TT></LI> - - <LI><TT>FL_CYAN</TT></LI> - - <LI><TT>FL_WHITE</TT></LI> -</UL> - -<P>These symbols are the default colors for all FLTK widgets. They are -explained in more detail in the chapter -<A HREF="enumerations.html#colors">Enumerations</A></P> - -<UL> - <LI><TT>FL_FOREGROUND_COLOR</TT> </LI> - - <LI><TT>FL_BACKGROUND_COLOR</TT> </LI> - - <LI><TT>FL_INACTIVE_COLOR</TT> </LI> - - <LI><TT>FL_SELECTION_COLOR</TT> </LI> -</UL> - -<P>RGB colors can be set using the <A HREF="functions.html#fl_rgb_color"><TT>fl_rgb_color()</TT></A> -function:</P> - -<UL><PRE> -Fl_Color c = fl_rgb_color(85, 170, 255); -</PRE></UL> - -<P>The widget color is set using the <TT>color()</TT> method:</P> - -<UL><PRE> -button->color(FL_RED); -</PRE></UL> - -<P>Similarly, the label color is set using the <TT>labelcolor()</TT> -method:</P> - -<UL><PRE> -button->labelcolor(FL_WHITE); -</PRE></UL> - -<H2><A NAME="boxtypes">Box Types</A></H2> - -<P>The type <TT>Fl_Boxtype</TT> stored and returned in -<A href="Fl_Widget.html#Fl_Widget.box"><TT>Fl_Widget::box()</TT></A> -is an enumeration defined in <A href="enumerations.html#Enumerations"><TT><Enumerations.H></TT></A>. -Figure 3-3 shows the standard box types included with FLTK.</P> - -<P ALIGN="CENTER"><IMG src="boxtypes.gif" ALT="FLTK Box Types"><BR> -<I>Figure 3-3: FLTK box types</I></P> - -<P><TT>FL_NO_BOX</TT> means nothing is drawn at all, so whatever is -already on the screen remains. The <TT>FL_..._FRAME</TT> types only -draw their edges, leaving the interior unchanged. The blue color in -Figure 3-3 is the area that is not drawn by the frame types.</P> - -<H3>Making Your Own Boxtypes</H3> - -<P>You can define your own boxtypes by making a small function that draws -the box and adding it to the table of boxtypes.</P> - -<CENTER><TABLE WIDTH="80%" BORDER="1" CELLPADDING="5" CELLSPACING="0" BGCOLOR="#cccccc"> -<TR> - <TD><B>Note:</B> - <P>This interface has changed in FLTK 2.0!</P> - </TD> -</TR> -</TABLE></CENTER> - -<H4>The Drawing Function</H4> - -<P>The drawing function is passed the bounding box and background color -for the widget:</P> - -<UL><PRE> -void xyz_draw(int x, int y, int w, int h, Fl_Color c) { -... -} -</PRE></UL> - -<!-- NEED 3in --> - -<P>A simple drawing function might fill a rectangle with the -given color and then draw a black outline:</P> - -<UL><PRE> -void xyz_draw(int x, int y, int w, int h, Fl_Color c) { - fl_color(c); - fl_rectf(x, y, w, h); - fl_color(FL_BLACK); - fl_rect(x, y, w, h); -} -</PRE></UL> - -<H4><A name="fl_down">Fl_Boxtype fl_down(Fl_Boxtype)</A></H4> - -<P><tt>fl_down</tt> returns the "pressed" or "down" version of a box. -If no "down" version of a given box exists, the behavior of this function -is undefined and some random box or frame is returned. -See also: <A HREF="drawing.html#fl_frame">fl_frame drawing</A>. - -<H4><A name="fl_frame">Fl_Boxtype fl_frame(Fl_Boxtype)</A></H4> - -<P><tt>fl_frame</tt> returns the unfilled, frame-only version of a box. -If no frame version of a given box exists, the behavior of this function -is undefined and some random box or frame is returned. -See also: <A HREF="drawing.html#fl_frame">fl_frame drawing</A>. - -<H4><A name="fl_box">Fl_Boxtype fl_box(Fl_Boxtype)</A></H4> - -<P><tt>fl_box</tt> returns the filled version of a frame. -If no filled version of a given frame exists, the behavior of this function -is undefined and some random box or frame is returned. -See also: <TT><A HREF="#fl_frame">fl_frame</A></TT>. - -<H4>Adding Your Box Type</H4> - -<P>The <TT>Fl::set_boxtype()</TT> method adds or replaces the -specified box type:</P> - -<UL><PRE> -#define XYZ_BOX FL_FREE_BOXTYPE - -Fl::set_boxtype(XYZ_BOX, xyz_draw, 1, 1, 2, 2); -</PRE></UL> - -<P>The last 4 arguments to <TT>Fl::set_boxtype()</TT> are the -offsets for the x, y, width, and height values that should be -subtracted when drawing the label inside the box.</P> - -<P>A complete box design contains four box types in this order: -a filled, neutral box (<TT>UP_BOX</TT>), a filled, depressed box -(<TT>DOWN_BOX</TT>), and the same as outlines only (<TT>UP_FRAME</TT> -and <TT>DOWN_FRAME</TT>). The function -<TT><A HREF="#fl_down">fl_down(Fl_Boxtype)</A></TT> -expects the neutral design on a boxtype with a numerical -value evenly divideable by two. -<TT><A HREF="#fl_frame">fl_frame(Fl_Boxtype)</A></TT> -expects the <TT>UP_BOX</TT> design at a value divideable by four.</P> - -<H2><A NAME="labels">Labels and Label Types</A></H2> - -<P>The <TT>label()</TT>, <TT>align()</TT>, <TT>labelfont()</TT>, -<TT>labelsize()</TT>, <TT>labeltype()</TT>, <TT>image()</TT>, and -<TT>deimage()</TT> methods control the labeling of widgets.</P> - -<H3>label()</H3> - -<P>The <TT>label()</TT> method sets the string that is displayed -for the label. Symbols can be included with the label string by -escaping them using the "@" symbol - "@@" displays a single at -sign. Figure 3-4 shows the available symbols.</P> - -<P ALIGN="CENTER"><A name="symbols"><IMG src="symbols.gif" ALT="FLTK Symbols"><BR> -<I>Figure 3-4: FLTK label symbols</I></A></P> - -<!-- NEED 2in --> - -<P>The @ sign may also be followed by the following optional -"formatting" characters, in this order:</P> - -<UL> - - <LI>'#' forces square scaling, rather than distortion to - the widget's shape.</LI> - - <LI>+[1-9] or -[1-9] tweaks the scaling a little bigger - or smaller.</LI> - - <LI>'$' flips the symbol horizontaly, '%' flips it verticaly.</LI> - - <LI>[0-9] - rotates by a multiple of 45 degrees. '5' and - '6' do no rotation while the others point in the - direction of that key on a numeric keypad. '0', followed by four - more digits rotates the symbol by that amount in degrees.</LI> - -</UL> - -<P>Thus, to show a very large arrow pointing downward you would use the -label string "@+92->". - -<H3>align()</H3> - -<P>The <TT>align()</TT> method positions the label. The following -constants are defined and may be OR'd together as needed:</P> - -<UL> - - <LI><TT>FL_ALIGN_CENTER</TT> - center the label in the widget.</LI> - - <LI><TT>FL_ALIGN_TOP</TT> - align the label at the top of the widget.</LI> - - <LI><TT>FL_ALIGN_BOTTOM</TT> - align the label at the bottom of the - widget.</LI> - - <LI><TT>FL_ALIGN_LEFT</TT> - align the label to the left of the widget.</LI> - - <LI><TT>FL_ALIGN_RIGHT</TT> - align the label to the right of the - widget.</LI> - - <LI><TT>FL_ALIGN_INSIDE</TT> - align the label inside the widget.</LI> - - <LI><TT>FL_ALIGN_CLIP</TT> - clip the label to the widget's bounding - box.</LI> - - <LI><TT>FL_ALIGN_WRAP</TT> - wrap the label text as needed.</LI> - - <LI><TT>FL_TEXT_OVER_IMAGE</TT> - show the label text over the image.</LI> - - <LI><TT>FL_IMAGE_OVER_TEXT</TT> - show the label image over the text (default).</LI> - -</UL> - -<H3><A NAME="labeltypes">labeltype()</A></H3> - -<P>The <TT>labeltype()</TT> method sets the type of the label. The -following standard label types are included:</P> - -<UL> - - <LI><TT>FL_NORMAL_LABEL</TT> - draws the text.</LI> - - <LI><TT>FL_NO_LABEL</TT> - does nothing.</LI> - - <LI><TT>FL_SHADOW_LABEL</TT> - draws a drop shadow under - the text.</LI> - - <LI><TT>FL_ENGRAVED_LABEL</TT> - draws edges as though - the text is engraved.</LI> - - <LI><TT>FL_EMBOSSED_LABEL</TT> - draws edges as thought - the text is raised.</LI> - - <LI><TT>FL_ICON_LABEL</TT> - draws the icon associated - with the text.</LI> - -</UL> - -<H3>image() and deimage()</H3> - -<P>The <TT>image()</TT> and <TT>deimage()</TT> methods set an image that -will be displayed with the widget. The <TT>deimage()</TT> method sets the -image that is shown when the widget is inactive, while the <TT>image()</TT> -method sets the image that is shown when the widget is active.</P> - -<P>To make an image you use a subclass of -<A HREF="drawing.html#Fl_Image"><TT>Fl_Image</TT></A>.</P> - -<H4>Making Your Own Label Types</H4> - -<P>Label types are actually indexes into a table of functions -that draw them. The primary purpose of this is to use this to -draw the labels in ways inaccessible through the -<TT>fl_font</TT> mechanisim (e.g. <TT>FL_ENGRAVED_LABEL</TT>) or -with program-generated letters or symbology.</P> - -<CENTER><TABLE WIDTH="80%" BORDER="1" CELLPADDING="5" CELLSPACING="0" BGCOLOR="#cccccc"> -<TR> - <TD><B>Note:</B> - <P>This interface has changed in FLTK 2.0!</P> - </TD> -</TR> -</TABLE></CENTER> - -<H5>Label Type Functions</H5> - -<P>To setup your own label type you will need to write two -functions: one to draw and one to measure the label. The draw -function is called with a pointer to a <TT>Fl_Label</TT> -structure containing the label information, the bounding box for -the label, and the label alignment:</P> - -<UL><PRE> -void xyz_draw(const Fl_Label *label, int x, int y, int w, int h, Fl_Align align) { -... -} -</PRE></UL> - -<P>The label should be drawn <I>inside</I> this bounding box, -even if <TT>FL_ALIGN_INSIDE</TT> is not enabled. The function -is not called if the label value is <TT>NULL</TT>.</P> - -<P>The measure function is called with a pointer to a -<TT>Fl_Label</TT> structure and references to the width and -height:</P> - -<UL><PRE> -void xyz_measure(const Fl_Label *label, int &w, int &h) { -... -} -</PRE></UL> - -<P>The function should measure the size of the label and set -<TT>w</TT> and <TT>h</TT> to the size it will occupy.</P> - -<H5>Adding Your Label Type</H5> - -<P>The <TT>Fl::set_labeltype</TT> method creates a label type -using your draw and measure functions:</P> - -<UL><PRE> -#define XYZ_LABEL FL_FREE_LABELTYPE - -Fl::set_labeltype(XYZ_LABEL, xyz_draw, xyz_measure); -</PRE></UL> - -<P>The label type number <TT>n</TT> can be any integer value -starting at the constant <TT>FL_FREE_LABELTYPE</TT>. Once you -have added the label type you can use the <TT>labeltype()</TT> -method to select your label type.</P> - -<P>The <TT>Fl::set_labeltype</TT> method can also be used to overload -an existing label type such as <TT>FL_NORMAL_LABEL</TT>.</P> - -<H4><A NAME="add_symbol">Making your own symbols</A></H4> - -<P>It is also possible to define your own drawings and add -them to the symbol list, so they can be rendered as part of -any label.</P> - -<P>To create a new symbol, you implement a drawing function -<tt>void drawit(Fl_Color c)</tt> which typically uses the -<a href="drawing.html#complex">complex drawing functions</a> -to generate a vector shape inside a two-by-two units sized box -around the origin. This function is then linked into the symbols -table using <tt>fl_add_symbol</tt>:</P> - -<UL><PRE> -<A NAME="fl_add_symbol">int fl_add_symbol(const char *name, void (*drawit)(Fl_Color), int scalable)</A> -</PRE></UL> - -<P><i>name</i> is the name of the symbol without the "@"; <i>scalable</I> -must be set to 1 if the symbol is generated using scalable vector drawing -functions.</P> - -<UL><PRE> -<A NAME="fl_draw_symbol">int fl_draw_symbol(const char *name,int x,int y,int w,int h,Fl_Color col)</A> -</PRE></UL> - -<P>This function draw a named symbol fitting the given rectangle. - -<H2>Callbacks</H2> - -<P>Callbacks are functions that are called when the value of a -widget changes. A callback function is sent a <TT>Fl_Widget</TT> -pointer of the widget that changed and a pointer to data that -you provide:</P> - -<UL><PRE> -void xyz_callback(Fl_Widget *w, void *data) { -... -} -</PRE></UL> - -<P>The <TT>callback()</TT> method sets the callback function for a -widget. You can optionally pass a pointer to some data needed for the -callback:</P> - -<UL><PRE> -int xyz_data; - -button->callback(xyz_callback, &xyz_data); -</PRE></UL> - -<P>Normally callbacks are performed only when the value of the -widget changes. You can change this using the -<A href="Fl_Widget.html#Fl_Widget.when"><TT>when()</TT></A> -method:</P> - -<UL><PRE> -button->when(FL_WHEN_NEVER); -button->when(FL_WHEN_CHANGED); -button->when(FL_WHEN_RELEASE); -button->when(FL_WHEN_RELEASE_ALWAYS); -button->when(FL_WHEN_ENTER_KEY); -button->when(FL_WHEN_ENTER_KEY_ALWAYS); -button->when(FL_WHEN_CHANGED | FL_WHEN_NOT_CHANGED); -</PRE></UL> - -<CENTER><TABLE WIDTH="80%" BORDER="1" CELLPADDING="5" CELLSPACING="0" BGCOLOR="#cccccc"> -<TR> - <TD><B>Note:</B> - - <P>You cannot delete a widget inside a callback, as the - widget may still be accessed by FLTK after your callback - is completed. Instead, use the <a - href='Fl.html#Fl.delete_widget'><tt>Fl::delete_widget()</tt></a> - method to mark your widget for deletion when it is safe - to do so.</p> - - <p><B>Hint:</B> - - <P>Many programmers new to FLTK or C++ try to use a - non-static class method instead of a static class method - or function for their callback. Since callbacks are done - outside a C++ class, the <TT>this</TT> pointer is not - initialized for class methods.</P> - - <P>To work around this problem, define a static method - in your class that accepts a pointer to the class, and - then have the static method call the class method(s) as - needed. The data pointer you provide to the - <TT>callback()</TT> method of the widget can be a - pointer to the instance of your class.</P> - -<PRE> -class Foo { - void my_callback(Fl_Widget *w); - static void my_static_callback(Fl_Widget *w, void *f) { ((Foo *)f)->my_callback(w); } - ... -} - -... - -w->callback(my_static_callback, (void *)this); -</PRE> - </TD> -</TR> -</TABLE></CENTER> - -<H2>Shortcuts</H2> - -<P>Shortcuts are key sequences that activate widgets such as -buttons or menu items. The <TT>shortcut()</TT> method sets the -shortcut for a widget:</P> - -<UL><PRE> -button->shortcut(FL_Enter); -button->shortcut(FL_SHIFT + 'b'); -button->shortcut(FL_CTRL + 'b'); -button->shortcut(FL_ALT + 'b'); -button->shortcut(FL_CTRL + FL_ALT + 'b'); -button->shortcut(0); // no shortcut -</PRE></UL> - -<P>The shortcut value is the key event value - the ASCII value -or one of the special keys like -<a href="enumerations.html#key_values"><TT>FL_Enter</TT></a> - -combined with any modifiers like <KBD>Shift</KBD>, -<KBD>Alt</KBD>, and <KBD>Control</KBD>.</P> - -</BODY> -</HTML> |