configure-gestures

Arguments: window &key pan pan-with-single-finger-vertically pan-with-single-finger-horizontally pan-with-gutter pan-with-inertia two-finger-tap zoom rotate press-and-tap

Establishes which capabilities of the gesture interface will be enabled for the specified window. The value of each keyword argument can be either t to enable the capability, nil or unspecified to disable it, or :inherit to inherit the value from an ancestor window or else the system defaults. Since unspecified values disable the associated capabilities, all capabilities that are to be enabled need to be passed on any call to this function.

Here are the meanings of the keyword arguments, all of which appear to be enabled by default (at least on the test machine) except where otherwise noted:

• pan - This must be enabled to enable any panning by dragging one or two fingers across the screen. Without the other panning options, two-fingered panning will be enabled both horizontally and vertically.
• pan-with-single-finger-vertically - Enables panning vertically by dragging a single finger.
• pan-with-single-finger-horizontally - Enables panning horizontally by dragging a single finger. This one appears to be disabled by default to allow the default behavior to select text instead.
• pan-with-gutter - If enabled, restricts panning to either the horizontal or vertical direction, whichever one the gesture begins with, unless the user also moves in the other direction by some minimum amount that breaks out of the gutter.
• pan-with-inertia - If enabled, calls to gesture-event will continue to be made for a brief period after a panning gesture ends during a drag, to allow the pan to gradually slow to a halt.
• two-finger-tap - Enables a simple tap with two fingers.
• zoom - Enables a two-finger pinch or spread gesture.
• rotate - Enables a two-finger circular motion around a central point. This one appears to be disabled by default.
• press-and-tap - Enables a gesture where one finger touches the screen momentarily, followed by a second finger while the first is still on the screen.

See also the touch-point class and About Touch Gesture Support in Common Graphics on Windows in cgide.htm.

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This page is new in the 10.0 release.
Created 2019.8.20.