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Cursors

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Cursors

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CURSORS

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<F8>Introduction<Tab><F7>10.1<#04><F0>A <F2>cursor<F0> is a visible 
shape that appears at the current position of<SP>the pointer device. 
The cursor shape moves with the pointer to provide<SP>continuous feedback 
to the user about the current location of the pointer.<SP>Each window 
can have a cursor attribute that defines the appearance of the<SP>pointer 
cursor when the pointer position lies within the window. See <F7>window<#1e>cu
rsor<F0>.

<para>

A cursor image is composed of a source bitmap, a mask bitmap, a <F2>hot 
spot<F0>, a foreground color, and a background color. Either 1<#1e>bit 
pixmaps or<SP>font glyphs can be used to specify source and mask bitmaps. 
The source<SP>bitmap identifies the foreground and background pixels 
of the cursor image;<SP>the mask bitmap identifies which source pixels 
are actually drawn. The mask<SP>bitmap thus allows a cursor to assume 
any shape. The hot spot defines the<SP>position within the cursor 
image that is displayed at the pointer position.

In CLX, a cursor is represented by a <F7>cursor<F0> object. This 
section describes<SP>the CLX functions to:

<bullet>

<F9>w<Tab><F0>Create and free cursor objects 

<F9>w<Tab><F0>Change cursor colors 

<F9>w<Tab><F0>Inquire the best cursor size 

<F9>w<Tab><F0>Access cursor attributes 

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<F8>Creating <Tab><F7>10.2<F0><#04>The following paragraphs describe 
the CLX functions used to create<FJ>

<p1para>

<F8>Cursors<Tab><F3><Tab>and free <F0>cursor<F3><SP>objects.

<syntax0>

create<#1e>cursor<F3> &key <F0>:source :mask :x :y :foreground :background<Tab>
<F3>Function<Index, Doc = operations, "xlib:create<#1e>cursor", Sort String = "create<#1e>cursor">

<return>

<F3><Tab>Returns: <F2><HR>
 cursor <#1f> <F3>Type <F0>cursor<F3>.

<para>

Creates and returns a cursor. <F7>:x<F0> and <F7>:y<F0> define 
the position of the hot spot relative to the origin of the <F7>:source. 
:foreground<F0> and <F7>:background<F0> colors must be<SP>specified, 
even if the server only has a <F7>:static<#1e>gray<F0> or <F7>:gray<#1e>scal
e<F0> screen.<SP>The <F7>:source<F0>, <F7>:x<F0>, and <F7>:y<F0><SP>argu
ments must also be specified.

The cursor image is drawn by drawing a pixel from the <F7>:source<F0> 
bitmap at<SP>every position where the corresponding bit in the <F7>:mask<F0> 
bitmap is 1. If the<SP>corresponding <F7>:source<F0> bit is 1, a 
pixel is drawn in the <F7>:foreground<F0><SP>color; otherwise, a 
pixel is drawn in the <F7>:background<F0> color. If the <F7>:mask<F0> 
is<SP>omitted, all <F7>:source<F0> pixels are drawn. If given, the <F7>:mask
<F0> must be the same size as the <F7>:source<F0>.

An X server may not be able to support every cursor size. A server 
is free to modify any component of the cursor to satisfy hardware 
or software limitations.

The <F7>:source<F0> and <F7>:mask<F0> can be freed immediately 
after the cursor is created. Subsequent drawing in the <F7>:source<F0> 
or<SP><F7>:mask<F0> pixmap has an undefined effect on the cursor.

<arg>

<F7>:source<F3> <#1f> The source pixmap. This argument is required.

<|,"10<#1e>108"><F7>:mask<F3> <#1f> The mask pixmap.

<F7>:x<F3>, <F7>:y<F3> <#1f> The hot spot position in the <F7>:source
<F3>. This argument is required.

<F7>:foreground<F3> <#1f> A <F7>color<F3> object specifying the 
foreground color. This argument is required.

<F7>:background<F3> <#1f> A <F7>color<F3> object specifying the 
background color. This argument is required.

<syntax0>

create<#1e>glyph<#1e>cursor<F3> &key <F0>:source<#1e>font :source<#1e>char 
:mask<#1e>font <Tab><F3>Function<Index, Doc = operations, "xlib:create<#1e>glyph<#1e>cursor", Sort String = "create<#1e>glyph<#1e>cursor"><HR>
(<F0>:mask<#1e>char<F3> 0)<F0> :foreground :background

<return>

<F3><Tab>Returns: <F2><HR>
 cursor <#1f> <F3>Type <F0>cursor<F3>.

<para>

Creates and returns a cursor defined by font glyphs. The source bitmap 
is<SP>defined by the <F7>:source<#1e>font<F0> and <F7>:source<#1e>char<F0>. 
The mask bitmap is defined by<SP>the <F7>:mask<#1e>font<F0> and <F7>:mask<#1e>
char<F0>. It is an error if the <F7>:source<#1e>char<F0> and<SP><F7>:mask<#1e>
char<F0> are not valid indexes for the <F7>:source<#1e>font<F0> 
and <F7>:mask<#1e>font<F0>,<SP>respectively. The hot spot position 
is defined by the <#7f>character origin" of<SP> the source glyph, 
that is, the position [- <F2>char<#1e>left<#1e>bearing<F0>, <F2>char<#1e>asc
ent<F0>]<SP>relative to the upper left corner of the source glyph 
bitmap.

Source and mask bits are compared after aligning the character origins 
of<SP>the source and mask glyphs. The source and mask glyphs need 
not have the<SP>same size or character origin position. If the <F7>:mask<#1e>f
ont<F0> is<SP>omitted, all source pixels are drawn.

An X server may not be able to support every cursor size. A server 
is free<SP>to modify any component of the cursor to satisfy hardware 
or software limitations.

Either of the <F7>:source<#1e>font<F0> or <F7>:mask<#1e>font<F0> 
can be closed after the cursor is<SP>created.

<arg>

<F7>:source<#1e>font<F3> <#1f> The source font. This is a required 
argument.

<F7>:source<#1e>char<F3> <#1f> An index specifying a glyph in the 
source font. This<SP>is a required argument.

<F7>:mask<#1e>font<F3> <#1f> The mask font.<F0> 

<F7>:mask<#1e>char<F3> <#1f> An index specifying a glyph in the 
mask font.

<F7>:foreground<F3> <#1f> A <F7>color<F3> object specifying the 
foreground color. This<SP>is a required argument.

<F7>:background<F3> <#1f> A <F7>color<F3> object specifying the 
background color. This<SP>is a required argument.<F0> 

<syntax>

free<#1e>cursor<F3> <F2>cursor<F0><Tab><F3>Function<Index, Doc = operations, "xlib:free<#1e>cursor", Sort String = "free<#1e>cursor">

<para>

Destroys the <F7>cursor<F0> object. Cursor server resources are 
freed when no other<SP> references remain.

<arg>

cursor<F3> <#1f> A <F7>cursor<F3> object.

<p1rule>

<Frame,
	Name =			p1rule,
	Placement =		At Anchor,
	Width =			6.35 inches,
	Height =		0.153 inches,
	Vertical Alignment =	0.007 inches,
	Shared Contents =	yes>

<p1stacked,
	Font =			F3,
	Left Tab =		-1.70/0 inches>

<F8>Cursor<Tab><F7>10.3<F0><#04>The following paragraphs describe 
the CLX functions used to operate

<p1para,
	Font =			F3,
	Left Tab =		-1.70/0 inches>

<F8>Functions<Tab><F0>on <F7>cursor<F0> objects.

<syntax0>

<|,"10<#1e>109">query<#1e>best<#1e>cursor <F2>width height display<F0><Tab><F3>Functio
n<Index, Doc = operations, "xlib:query<#1e>best<#1e>cursor", Sort String = "query<#1e>best<#1e>cursor">

<return>

<F3><Tab>Returns: <F2><HR>
 width<F3>,<F2> height <#1f> <F3>Type <F0>card16<F3>.

<para>

Returns the cursor size closest to the requested <F2>width<F0> and <F2>heigh
t<F0> that is best suited to the display. The <F2>width<F0> and <F2>height
<F0> returned define the largest<SP>cursor size supported by the 
X server. Clients should always be prepared to<SP>limit cursor sizes 
to those supported by the server.

<arg>

display<F3> <#1f> A <F7>display<F3> object.

width<F3>,<F0><SP>height<F3> <#1f> The requested cursor size. 

<syntax>

recolor<#1e>cursor<F3> <F2>cursor foreground background<F0><Tab><F3>Functio
n<Index, Doc = operations, "xlib:recolor<#1e>cursor", Sort String = "recolor<#1e>cursor">

<para>

Changes the color of the specified <F2>cursor<F0>. If the<SP>cursor 
is displayed on a screen, the change is visible immediately.

<arg>

cursor<F3> <#1f> A <F7>cursor<F3> object.

foreground<F3> <#1f> A <F7>color<F3> object specifying the new 
foreground color.

background<F3> <#1f> A <F7>color<F3> object specifying the new 
background color.

<p1rule>

<Frame,
	Name =			p1rule,
	Placement =		At Anchor,
	Width =			6.35 inches,
	Height =		0.153 inches,
	Vertical Alignment =	0.007 inches,
	Shared Contents =	yes>

<p1stacked,
	Font =			F3,
	Left Tab =		-1.70/0 inches>

<F8>Cursor<Tab><F7>10.4<F0><#04>The complete set of cursor attributes 
is discussed in the following<F7><FJ>

<p1para,
	Font =			F3,
	Left Tab =		-1.70/0 inches>

<F8>Attributes<Tab><F0>paragraphs.

<syntax0>

cursor<#1e>display<F3> <F2>cursor<F0><Tab><F3>Function<Index, Doc = operations, "xlib:cursor<#1e>display", Sort String = "cursor<#1e>display">

<return>

<Tab><F3>Returns: <F2><HR>
  display <F3><#1f> Type <F0>display<F3>. 

<para>

Returns the <F7>display<F0> object associated with the specified <F2>cursor
<F0>. 

<arg>

cursor <#1f> <F3>A <F7>cursor<F3> object. 

<syntax,
	Left Tab =		-0.90/0 inches,
	Right Tab =		7.50 inches>

cursor<#1e>equal <F2>cursor<#1e>1<F3> <F2>cursor<#1e>2<F0><Tab><F3>Functio
n<Index, Doc = operations, "xlib:cursor<#1e>equal", Sort String = "cursor<#1e>equal">

<para>

Returns true if the two arguments refer to the same server resource 
and <F7>nil<F0> if they do not.

<arg>

cursor<#1e>1<F3>, <F0>cursor<#1e>2 <F3><#1f> <F7>cursor<F3> objects.

<syntax,
	Bottom Margin =		0 inches,
	Left Tab =		-0.90/0 inches,
	Right Tab =		7.50 inches>

cursor<#1e>id<F3> <F2>cursor<F0><Tab><F3>Function<Index, Doc = operations, "xlib:cursor<#1e>id", Sort String = "cursor<#1e>id">

<return>

<Tab><F3>Returns: <F2><HR>
  id <F3><#1f> Type <F0>resource<#1e>id.<F3> 

<para>

Returns the unique resource ID that has been assigned to the specified <F2>cur
sor<F0>.

<arg>

cursor <F3><#1f> A <F7>cursor<F3> object.

<syntax,
	Bottom Margin =		0 inches,
	Left Tab =		-0.90/0 inches,
	Right Tab =		7.50 inches>

cursor<#1e>p<F3> <F2>cursor<F0><Tab><F3>Function<Index, Doc = operations, "xlib:cursor<#1e>p", Sort String = "cursor<#1e>p">

<return>

<Tab><F3>Returns: <F2><HR>
  cursor<#1e>p<F3> <#1f> Type <F0>boolean<F3>. 

<para>

Returns true if the argument is a <F7>cursor<F0> object and <F7>nil<F0> 
otherwise.

<syntax,
	Bottom Margin =		0 inches,
	Left Tab =		-0.90/0 inches,
	Right Tab =		7.50 inches>

cursor<#1e>plist<F3> <F2>cursor<F0><Tab><F3>Function<Index, Doc = operations, "xlib:cursor<#1e>plist", Sort String = "cursor<#1e>plist">

<return>

<Tab><F3>Returns: <F2><HR>
  plist<F3> <#1f> A property list.

<para>

Returns and (with <F7>setf<F0>) sets the property list for the specified 
<F2>cursor<F0>. This function provides a hook where extensions can 
add data.

<arg>

cursor <F3><#1f> A <F7>cursor<F3> object.

<newpage>

<|,"10<#1e>110">

.