XmFontSelector man page

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 selctions. 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>

XiPaned topPane

XmComboBox families

< See XmComboBox for list of children >

XmSeparator separator

XiComboBox sizes

< See XmComboBox for list of children >

XmSeparator separator

XmButtonBox boldItalicBox

XmToggleButton boldButton

XmToggleButton italicButton

XmSeparator separator

XmToggleButton optionButton

XmSeparator separator

XmPaned middlePane

XmPaned leftPane

XmButtonBox choiceBox

XmToggleButton xlfdButton

XmToggleButton otherButton

XmSeparator separator

XmButtonBox resolutionBox

XmToggleButton dpi75Button

XmToggleButton dpi100Button

XmToggleButton anyButton

XmSeparator separator

XmSeparator separator

XmButtonBox spacingBox

XmToggleButton proportionalButton

XmToggleButton monoButton

XmToggleButton bothButton

XmSeparator separator

XmButtonBox otherChoiceBox

XmToggleButton scalingButton

XmToggleButton isoButton

XmToggleButton showNameButton

XmRowColum      encodingOptionMenu

XmLabelGadget OptionLabel

XmCascadeButtonGadget OptionButton

XmMenuShell     menuShell

XmRowColum      pulldownMenu

<dependent on XmNencoding>

XmSeparator separator

XmSeparator separator

XmButtonBox box

XmScrolledWindow textSW

XmScrollBar vbar

XmText text

XmSeparator separator

XmLabel nameLabel

XmSeparator separator