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@@ -1,7 +1,7 @@
The XFIXES Extension
- Version 4.0
- Document Revision 2
- 2006-12-14
+ Version 5.0
+ Document Revision 1
+ 2010-11-15
Keith Packard
keithp@keithp.com
@@ -19,7 +19,7 @@ developers, in particular,
+ Owen Taylor for describing the issues raised with the XEMBED
mechanisms and SaveSet processing and his initial extension
- to handle this issue.
+ to handle this issue, and for pointer barriers
+ Bill Haneman for the design for cursor image tracking.
@@ -566,6 +566,90 @@ ShowCursor
Servers supporting the X Input Extension Version 2.0 or higher show
all visible cursors in response to a ShowCursor request.
+************* XFIXES VERSION 5 OR BETTER ***********
+
+12. Pointer Barriers
+
+Compositing managers and desktop environments may have UI elements in
+particular screen locations such that for a single-headed display they
+correspond to easy targets according to Fitt's Law, for example, the top
+left corner. For a multi-headed environment these corners should still be
+semi-impermeable. Pointer barriers allow the application to define
+additional constraint on cursor motion so that these areas behave as
+expected even in the face of multiple displays.
+
+Absolute positioning devices like touchscreens do not obey pointer barriers.
+There's no advantage to target acquisition to do so, since on a touchscreen
+all points are in some sense equally large, whereas for a relative
+positioning device the edges and corners are infinitely large.
+
+WarpPointer and similar requests do not obey pointer barriers, for
+essentially the same reason.
+
+12.1 Types
+
+ BARRIER: XID
+
+ BarrierDirections
+
+ BarrierPositiveX: 1 << 0
+ BarrierPositiveY: 1 << 1
+ BarrierNegativeX: 1 << 2
+ BarrierNegativeY: 1 << 3
+
+12.2 Errors
+
+ Barrier
+
+12.3 Requests
+
+CreatePointerBarrier
+
+ barrier: BARRIER
+ drawable: DRAWABLE
+ x1, y2, x2, y2: INT16
+ directions: CARD32
+ devices: LISTofDEVICEID
+
+ Creates a pointer barrier along the line specified by the given
+ coordinates on the screen associated with the given drawable. The
+ barrier has no spatial extent; it is simply a line along the left
+ or top edge of the specified pixels. Barrier coordinates are in
+ screen space.
+
+ The coordinates must be axis aligned, either x1 == x2, or
+ y1 == y2, but not both. The varying coordinates may be specified
+ in any order. For x1 == x2, either y1 > y2 or y1 < y2 is valid.
+ If the coordinates are not valid BadValue is generated.
+
+ Motion is allowed through the barrier in the directions specified:
+ setting the BarrierPositiveX bit allows travel through the barrier
+ in the positive X direction, etc. Nonsensical values (forbidding Y
+ axis travel through a vertical barrier, for example) and excess set
+ bits are ignored.
+
+ If the server supports the X Input Extension version 2 or higher,
+ the devices element names a set of master device to apply the
+ barrier to. If XIAllDevices or XIAllMasterDevices are given, the
+ barrier applies to all master devices. If a slave device is named,
+ BadDevice is generated; this does not apply to slave devices named
+ implicitly by XIAllDevices. Naming a device multiple times is
+ legal, and is treated as though it were named only once. If a
+ device is removed, the barrier continues to apply to the remaining
+ devices, but will not apply to any future device with the same ID
+ as the removed device. Nothing special happens when all matching
+ devices are removed; barriers must be explicitly destroyed.
+
+ Errors: IDChoice, Window, Value, Device
+
+DestroyPointerBarrier
+
+ barrier: BARRIER
+
+ Destroys the named barrier.
+
+ Errors: Barrier
+
99. Future compatibility
This extension is not expected to remain fixed. Future changes will