two-stroke-gesture

Arguments: window count gesture

This generic function is called whenever all fingers are removed from the screen after a gesture on a two-stroke-mixin window. An application can provide methods on this generic function to handle certain kinds of gestures. See the two-stroke-mixin class for more information.

A two-stroke-gesture method should return true if it handled the gesture, to override any default behavior. Returning will allow default behavior, which for a tap will call mouse-left-down and for a hold will call mouse-right-down. Other default behavior would depend on what Microsoft does when touch-event returns nil.

window will be the two-stroke-mixin window where the gesture was done.

count will be an integer from 1 to 10 (inclusive) for the maximum number of fingers that were in contact with the screen simultaneously during the gesture.

gesture will be a keyword symbol for the particular gesture that was interpreted from the many finger coordinates that were passed at a lower level to a touch-event method. Here are the possible keywords that may get passed, with their meanings:

• :tap - the user did not drag appreciably, and released all fingers within two-stroke-hold-time milliseconds.
• :hold - the user did not drag appreciably, and held one or more fingers down longer than two-stroke-hold-time milliseconds.
• :pinch - the maximum finger count is 2, and the two fingers were moved closer to each other during the gesture by a certain threshold or more.
• :spread - the maximum finger count is 2, and the two fingers were moved farther from each other during the gesture by a certain threshold or more.
• :left, :up, :right, or :down - the user dragged in one of these orthogonal directions.
• :left-up, :left-right, :left-down, :up-left, :up-down, :up-right, :right-up, :right-left, :right-down, :down-right, :down-up, or :down-left - the user dragged in the direction that's mentioned first in the keyword and then (with fingers still in contact with the screen) dragged in the second direction. A curved motion will still be interpreted as two directions as long as the path ventures sufficiently to one side of the line between the starting and ending positions, and where both vertical and horizontal differences between the starting and ending positions are also sufficient.

  While up to ten fingers are tracked, a dragging gesture will be interpreted only from the path of the first finger that made contact with the screen. Gestures other than those mentioned above will be interpreted as the one that most closely resembles the gesture that was done.

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This page was not revised from the 10.0 page.
Created 2019.8.20.