touch-action

Css-свойство touch-action указывает как элемент будет управляться через тачскрин (например, при помощи возможности приближения (zooming), встроенной в браузер).

/* Keyword values */
touch-action: auto;
touch-action: none;
touch-action: pan-x;
touch-action: pan-left;
touch-action: pan-right;
touch-action: pan-y;
touch-action: pan-up;
touch-action: pan-down;
touch-action: pinch-zoom;
touch-action: manipulation;

/* Global values */
touch-action: inherit;
touch-action: initial;
touch-action: unset;

По умолчанию, жесты панорамирование, прокрутка и сужающий обрабатываются исключительно браузером. Приложение, использующие Pointer events получит событие pointercancel (en-US), когда браузер начнёт обрабатывать тач жест. Явно указывая жесты обрабатываемые браузером, приложение может иметь своё поведение для оставшихся жестов благодаря прослушиванию событий pointermove (en-US) и pointerup (en-US). Приложения, использующие Touch events, отключают обработку жестов браузером вызовом preventDefault(), но также следует использовать touch-action, чтобы убедиться, что веб-обозреватель знает о намерениях приложения до того, как "проснутся" обработчики событий.

When a gesture is started, the browser intersects the touch-action values of the touched element and all its ancestors up to the one that implements the gesture (in other words, the first containing scrolling element). This means that in practice, touch-action is typically applied only to individual elements which have some custom behavior, without needing to specify touch-action explicitly on any of that element's descendants. After a gesture has started, changes to touch-action values will not have any impact on the behavior of the current gesture.

Syntax

The touch-action property may be specified as either:

Значения

auto

Enable browser handling of all panning and zooming gestures.

none

Disable browser handling of all panning and zooming gestures.

pan-x

Enable single-finger horizontal panning gestures. May be combined with pan-y, pan-up, pan-down and/or pinch-zoom.

pan-y

Enable single-finger vertical panning gestures. May be combined with pan-x, pan-left, pan-right and/or pinch-zoom.

manipulation

Enable panning and pinch zoom gestures, but disable additional non-standard gestures such as double-tap to zoom. Disabling double-tap to zoom removes the need for browsers to delay the generation of click events when the user taps the screen. This is an alias for "pan-x pan-y pinch-zoom" (which, for compatibility, is itself still valid).

pan-left, pan-right,pan-up,pan-down

Enable single-finger gestures that begin by scrolling in the given direction(s). Once scrolling has started, the direction may still be reversed. Note that scrolling "up" (pan-up) means that the user is dragging their finger downward on the screen surface, and likewise pan-left means the user is dragging their finger to the right. Multiple directions may be combined except when there is a simpler representation (for example, "pan-left pan-right" is invalid since "pan-x" is simpler, but "pan-left pan-down**" is valid).

pinch-zoom

Enable multi-finger panning and zooming of the page. This may be combined with any of the pan- values.

Formal syntax

touch-action = 
  auto                                                | (en-US)
  none                                                | (en-US)
  [ (en-US) [ (en-US) pan-x | (en-US) pan-left | (en-US) pan-right ] (en-US) || (en-US) [ (en-US) pan-y | (en-US) pan-up | (en-US) pan-down ] (en-US) || (en-US) pinch-zoom ] (en-US)  | (en-US)
  manipulation

Примеры

The most common usage is to disable all gestures on an element (and its non-scrollable descendants) that provides its own dragging and zooming behavior – such as a map or game surface.

#map {
  touch-action: none;
}

Another common pattern is that of an image carousel which uses pointer events to handle horizontal panning, but doesn't want to interfere with vertical scrolling or zooming of the document.

.image-carousel {
  width: 100%;
  height: 150px;
  touch-action: pan-y pinch-zoom;
}

touch-action is also often used to completely disable the delay of click events caused by support for the double-tap to zoom gesture.

html {
  touch-action: manipulation;
}

Спецификации

Specification Status Comment
Compatibility Standard
Определение 'touch-action' в этой спецификации.		 Живой стандарт Added pinch-zoom property value.
Pointer Events – Level 2
Определение 'touch-action' в этой спецификации.		 Рекомендация Added pan-left, pan-right, pan-up, pan-down property values.
Pointer Events
Определение 'touch-action' в этой спецификации.		 Устаревшая Initial definition

Поддержка браузерами

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