diff options
| -rw-r--r-- | specs/XI2proto.txt | 21 |
1 files changed, 7 insertions, 14 deletions
diff --git a/specs/XI2proto.txt b/specs/XI2proto.txt index ca315c1..15131dd 100644 --- a/specs/XI2proto.txt +++ b/specs/XI2proto.txt @@ -74,18 +74,6 @@ The additions in XI 2.2 aim to: - be backwards-compatible to pre-XI 2.2 clients through emulation of XI 2.x/XI 1.x and core pointer events. -XI 2.2 caters for two modes of touch input devices: - -- 'Direct' multi-touch input devices such as touchscreens. These devices - provide independent touchpoints that can occur anywhere on the screen; - "direct" here refers to the user manipulating objects at their screen - location, e.g. touching an object and physically moving it. -- 'Dependent' touch input devices such as multi-touch trackpads and mice with - additional touch surfaces. These devices provide independent touchpoints that - often need to be interpreted relative to the current position of the cursor - on that same device. Such interactions are usually the result of a gesture - performed on the device, rather than direct manipulation. - Touch events are only available to clients supporting version 2.2 or later of the X Input Extension. Clients must use the XIQueryVersion request to announce support for this version. Touch devices may generate emulated pointer events @@ -420,13 +408,18 @@ following device modes are defined for this protocol: 'DirectTouch': These devices map their input region to a subset of the screen region. Touch - events are delivered to window at the location of the touch. An example + events are delivered to window at the location of the touch. "direct" + here refers to the user manipulating objects at their screen location, + e.g. touching an object and physically moving it. An example of a DirectTouch device is a touchscreen. 'DependentTouch': These devices do not have a direct correlation between a touch location and a position on the screen. Touch events are delivered according to the - location of the device's cursor. An Example of a DependentTouch device is a + location of the device's cursor and often need to be interpreted + relative to the current position of that cursor. Such interactions are + usually the result of a gesture performed on the device, rather than + direct manipulation. An example of a DependentTouch device is a trackpad. A device is identified as only one of the device modes above at any time, and |