XRSession: squeeze event - Web APIs 编辑

Secure context

This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

The WebXR event squeeze is sent to an XRSession when one of the session's input sources has completed a primary squeeze action. Examples of comon kinds of primary action are users pressing triggers or buttons, tapping a touchpad, speaking a command, or performing a recognizable gesture when using a video tracking system or handheld controller with an accelerometer.

For details on how the squeezestart, squeeze, and squeezeend events work, and how you should react to them, see Primary squeeze actions in Inputs and input sources.

Examples

The following example uses addEventListener() to set up a handler for the squeeze event. The handler fetches the pose representing the target ray for tracked-pointer inputs and sends the pose's transform to a function called myHandleSqueezeWithRay().

This code treats the squeeze as an instantaneous action that doesn't involve tracking an ongoing activity. If you need to track a squeeze action that isn't instantaneous, listen for the squeezestart and squeezeend events to sense when the squeeze action begins and ends.

xrSession.addEventListener("squeeze", event => {
  if (event.inputSource.targetRayMode == "tracked-pointer") {
    let targetRayPose = event.frame.getPose(event.inputSource.targetRaySpace,
                              myRefSpace);
    if (targetRayPose) {
      myHandleSqueezeWithRay(targetRayPose.transform);
    }
  }
});

You can of course also set up a handler for squeeze events by setting the XRSession object's onsqueeze event handler property to a function that handles the event:

xrSession.onsqueeze = event => {
  if (event.inputSource.targetRayMode == "tracked-pointer") {
    let targetRayPose = event.frame.getPose(event.inputSource.targetRaySpace,
                              myRefSpace);
    if (targetRayPose) {
      myHandleSqueezeWithRay(targetRayPose.transform);
    }
  }
};

Specifications