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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/tapping.dox | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/doc/tapping.dox b/doc/tapping.dox index 1337fc53..483219ad 100644 --- a/doc/tapping.dox +++ b/doc/tapping.dox @@ -29,17 +29,24 @@ libinput also supports "tap-and-drag" where a tap immediately followed by a finger down and that finger being held down emulates a button press. Moving the finger around can thus drag the selected item on the screen. +Optional is a feature called "drag lock". With drag lock disabled, lifting +the finger will stop any drag process. When enabled, libinput will ignore a +finger up event during a drag process, provided the finger is set down again +within a implementation-specific timeout. Drag lock can be enabled and +disabled with libinput_device_config_tap_set_drag_lock_enabled(). + @image html tap-n-drag.svg "Tap-and-drag process" The above diagram explains the process, a tap (a) followed by a finger held down (b) starts the drag process and logically holds the left mouse button down. A movement of the finger (c) will drag the selected item until the -finger is relased (e). If needed, the finger's position can be reset by -lifting and quickly setting it down again on the touchpad (d). This will be -interpreted as continuing move and is especially useful on small touchpads -or with slow pointer acceleration. -The release of the mouse buttons after the finger release (e) is triggered -by a timeout. To release the button immediately, simply tap again (f). +finger is relased (e). If needed and drag lock is enabled, the finger's +position can be reset by lifting and quickly setting it down again on the +touchpad (d). This will be interpreted as continuing move and is especially +useful on small touchpads or with slow pointer acceleration. +If drag lock is enabled, the release of the mouse buttons after the finger +release (e) is triggered by a timeout. To release the button immediately, +simply tap again (f). If two fingers are supported by the hardware, a second finger can be used to drag while the first is held in-place. |