bionic (3) XmFontSelector.3.gz
NAME
XmFontSelector - The Font Selector widget
SYNOPSIS
#include <Xm/FontS.h>
DESCRIPTION
The Font Selector widget allows users to easily choose a font by selecting the font family and size of
the font. The bold and italic attributes may also be set for any font for which they are available. Any
font may be passed to the font selector by the application as the initial value shown to the user.
Advanced features greatly extend the widget's functionality.
Basic Features
The font selector widget presents the user with two combination box widgets, one with a list of choices
for the font family, and the other with the choices for the font size. In addition there are two
independent toggle buttons that allow the user to make the font bold or italic or bold/italic. Below the
font choice area is a text widget that displays sample text of the chosen font to the user. This text
area is editable, allowing the user to add or remove text to see how various characters appear in the
chosen font. For the novice user this set of features allows access to all standard fonts on the
system. The font selector dynamically removes choices that are inappropriate so the user is free to play
around with different combinations and can always be assured that once they have selected a font that it
will exist on the machine that the font selector is running on. For example if there is no Times Roman 14
point font available, and the user selects a point size of 14, then Times Roman will not be available in
the family combination box. Likewise, if the user had chosen Times Roman from the family dialog box then
a size of 14 would not be shown. To have all choices available simply choose a size and family of Any.
Advanced Features
For the advanced user the font selector provides tremendous flexibility in font choices. By activating
the options button an additional panel of controls is presented to the user. This allows the user to gain
access to non-XLFD fonts, control the resolutions of the fonts chosen, choose from fixed or proportional
fonts only, remove the use of font scaling, allow non iso8859-1 fonts to be viewed, and see the XLFD name
the font selector is constructing.
Non XLFD Fonts
By choosing the "Other Fonts" toggle from the option panel, the family and size lists, as well as the
bold and italic toggles, are replaced with a combo box containing all non-XLFD fonts available on your
system. This feature allows users to select non-XLFD fonts with the FontSelector. The text field of the
combination box may be edited by the user and any string entered will be interpreted as a font name. It
should be noted that XLFD names can be typed in by hand here. This feature allows the font selector to be
used to get any font on the entire system.
Resolution Control
The font selector finds which of the two standard resolutions the current display is closest to and uses
that as its default. To allow a wider range of choices a user may choose to access fonts of a different
resolution, or both 75 and 100 dpi resolutions.
Fixed or Proportional
In most cases the fact that a font is fixed width or proportional is of no great interest to the user.
But some applications require a fixed width font, such as terminal emulators, and most people find that
proportional fonts look better. The Font selector allows users to limit the font choices to fixed width
or proportional or to allow both.
Font Scaling
The font scaling technology that is available in X11R5 uses bitmap scaling which, although useful in some
cases, generally results in very ugly fonts. We noticed that users often wanted to know which fonts are
scaled and which ones exist as hand crafted bitmaps. To remove the scaled fonts from the list of
choices, toggle the "Use Font Scaling" button off. This value is resource controllable and defaults to
on, which uses font scaling.
Encoding
The programmer can specify which encidings are valid selections. These encoding choices appear in an
option menu. The list of font choices is restricted to those which use the current selected coding.
XLFD Name Display
Clicking the Show toggle displays the current font's XLFD name is shown at the bottom of the font
selector.
Normal Resources
Name Class Type InitialValue
100DPIstring 100DPIString XmString "100 dpi"
75DPIstring 75DPIString XmString "75 dpi"
anyLowerString AnyLowerString XmString "any"
anyString AnyString XmString "Any"
boldString BoldString XmString "Bold"
bothString BothString XmString "Both"
currentFont String String NULL
defaultEncodingString DefaultEncodingString String "iso8859-1"
encodingList EncodingList StringTable "iso8859-1"
encodingString EncodingString XmString "Encoding"
familyString BothString XmString "Family"
italicString ItalicString XmString "Italic"
marginHeight Margin Dimension 0
monoSpaceString MonoSpaceString XmString "Fixed Width
Fonts"
optionString OptionString XmString "Options ..."
otherString OtherString XmString "Other Fonts"
propSpaceString PropSpaceString XmString "Proportional
Fonts"
sampleText SampleText XmString "abcdef..."
scalingString ScalingString XmString "Use Font
Scaling"
showFontName ShowFontName Boolean False
showNameString ShowNameString XmString "Show Font
Name"
sizeString SizeString XmSring "Size"
spacing Spacing Dimension 2
textRows TextRows Dimension 8
useScaling Boolean Boolean True
valueChangedCallback Callback XtCallbackList NULL
xlfdString XlfdString XmString "Xlfd Fonts"
All resource names begin with XmN and all resource class names begin with XmC.
100DPSString
The label for the 100 DPI radio button.
75DPSString
The label for the 75 DPI radio button.
anyLowerString
The label for the any button.
anyString
The label for the Any button.
boldString
The label for the Bold toggle button.
bothString
The labels for the Both radio buttons controlling both the dpi and width of the fonts displayed. The same
resource is used to ensure consistent labels.
currentFont
This resource provides the main application input and output to the font selector. If the programmer
sets the value at creation time or with XtSetValues then the currently displayed family, size, bold and
italic will be changed to correspond to the values shown in the current font. Otherwise, the name of the
font will be shown. The Font Selector's mode will be set to correspond to the type of font passed.
Note: currentFont must contain 14 hyphens (-) to be considered an XLFD font. This resource is also used
to retrieve the font the user has selected from the font selector. The value returned is only valid until
the next time XtGetValues is called on this instance of the font selector widget.
defaultEncodingString
This resource is the default selection from the Encoding options menu.
encodingList
This resource is the list of encodings available from the FontSelector Encoding options menu.
encodingString
This resource is the default selection from the Encoding options menu.
familyString
This resource is the default selection from the Family options menu.
isoFontsOnly
This resource controls and maintains the state of the iso8859-1 fonts only toggle button.
italicString
This resource is the default selection from the Italic toggle button.
marginHeight
The margin height for all subwidgets of the Font Selector.
monoSpaceString
The label of the Fixed Width Fonts radio button.
optionString
The label for the Options... push button.
otherString
The label for the Other Fonts radio button.
propSpaceString
The label for the Proportional Fonts radio button.
sampleText
The string which appears in the sample text area.
scalingString
The label for the Use Font Scaling toggle button.
showFontName
This boolean resource controls and maintains the state of Show Font Name toggle button.
showNameString
The label of the Show Font Name toggle button.
sizeString
The label for the Size option menu.
spacing
The space between the toggle indicator and the toggle label.
textRows
This resource controls the number of rows that are shown in the text widget that displays sample text in
the currently selected font. Since this is a scrolled text widget it will never dynamically change size,
regardless of the font displayed. Unless the initial font is large this value should be at least 4 or
the user interaction may be poor.
useScaling
This resource controls and maintains the state of the Use Font Scaling toggle button.
valueChangedCallback
The list of callbacks called when the XmNcurrentFont value is changed.
xlfdString
The label for the Xlfd Fonts radio button.
Convenience Routine
XmCreateFontSelector - Widget creation convenience routine
Widget XmCreateFontSelector(
Widget parent, /* Widget id of parent for FontSelector */
String name, /* Name of the created widget */
ArgList args, /* argument list */
Cardinal num_args /* number of items in argument list */
)
Children
The font selector is composed of many sub-widgets. As with all widgets, most values passed to this widget
through the argument list at creation time or via set values are passed to each of this widget's
children. Get values requests must be made on a child by child basis. The children of the font selector
are listed below. The documentation for each of the children should be consulted for a list of resources
for each child.
XiFontSelector<named by application>
XiPanedtopPane
XmComboBoxfamilies
< See XmComboBox for list of children >
XmSeparatorseparator
XiComboBoxsizes
< See XmComboBox for list of children >
XmSeparatorseparator
XmButtonBoxboldItalicBox
XmToggleButtonboldButton
XmToggleButtonitalicButton
XmSeparatorseparator
XmToggleButtonoptionButton
XmSeparatorseparator
XmPanedmiddlePane
XmPanedleftPane
XmButtonBoxchoiceBox
XmToggleButtonxlfdButton
XmToggleButtonotherButton
XmSeparatorseparator
XmButtonBoxresolutionBox
XmToggleButtondpi75Button
XmToggleButtondpi100Button
XmToggleButtonanyButton
XmSeparatorseparator
XmSeparatorseparator
XmButtonBoxspacingBox
XmToggleButtonproportionalButton
XmToggleButtonmonoButton
XmToggleButtonbothButton
XmSeparatorseparator
XmButtonBoxotherChoiceBox
XmToggleButtonscalingButton
XmToggleButtonisoButton
XmToggleButtonshowNameButton
XmRowColum encodingOptionMenu
XmLabelGadget OptionLabel
XmCascadeButtonGadget OptionButton
XmMenuShell menuShell
XmRowColum pulldownMenu
<dependent on XmNencoding>
XmSeparatorseparator
XmSeparatorseparator
XmButtonBoxbox
XmScrolledWindowtextSW
XmScrollBarvbar
XmTexttext
XmSeparatorseparator
XmLabelnameLabel
XmSeparatorseparator
COPYRIGHT
Copyright (c) 1992 by Integrated Computer Solutions, Inc.
XmFontSelector(3)