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/**
* @license
* Copyright 2016 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @fileoverview Touch handling for Blockly.
* @author [email protected] (Rachel Fenichel)
*/
'use strict';
/**
* @name Blockly.Touch
* @namespace
*/
goog.provide('Blockly.Touch');
goog.require('Blockly.constants');
goog.require('Blockly.utils');
goog.require('Blockly.utils.global');
goog.require('Blockly.utils.string');
/**
* Whether touch is enabled in the browser.
* Copied from Closure's goog.events.BrowserFeature.TOUCH_ENABLED
*/
Blockly.Touch.TOUCH_ENABLED =
('ontouchstart' in Blockly.utils.global ||
!!(Blockly.utils.global['document'] && document.documentElement &&
'ontouchstart' in document.documentElement) ||
// IE10 uses non-standard touch events, so it has a different check.
!!(Blockly.utils.global['navigator'] &&
(Blockly.utils.global['navigator']['maxTouchPoints'] ||
Blockly.utils.global['navigator']['msMaxTouchPoints'])));
/**
* Which touch events are we currently paying attention to?
* @type {?string}
* @private
*/
Blockly.Touch.touchIdentifier_ = null;
/**
* The TOUCH_MAP lookup dictionary specifies additional touch events to fire,
* in conjunction with mouse events.
* @type {Object}
*/
Blockly.Touch.TOUCH_MAP = {};
if (Blockly.utils.global['PointerEvent']) {
Blockly.Touch.TOUCH_MAP = {
'mousedown': ['pointerdown'],
'mouseenter': ['pointerenter'],
'mouseleave': ['pointerleave'],
'mousemove': ['pointermove'],
'mouseout': ['pointerout'],
'mouseover': ['pointerover'],
'mouseup': ['pointerup', 'pointercancel'],
'touchend': ['pointerup'],
'touchcancel': ['pointercancel']
};
} else if (Blockly.Touch.TOUCH_ENABLED) {
Blockly.Touch.TOUCH_MAP = {
'mousedown': ['touchstart'],
'mousemove': ['touchmove'],
'mouseup': ['touchend', 'touchcancel']
};
}
/**
* PID of queued long-press task.
* @private
*/
Blockly.longPid_ = 0;
/**
* Context menus on touch devices are activated using a long-press.
* Unfortunately the contextmenu touch event is currently (2015) only supported
* by Chrome. This function is fired on any touchstart event, queues a task,
* which after about a second opens the context menu. The tasks is killed
* if the touch event terminates early.
* @param {!Event} e Touch start event.
* @param {Blockly.Gesture} gesture The gesture that triggered this longStart.
* @package
*/
Blockly.longStart = function(e, gesture) {
Blockly.longStop_();
// Punt on multitouch events.
if (e.changedTouches && e.changedTouches.length != 1) {
return;
}
Blockly.longPid_ = setTimeout(function() {
// Additional check to distinguish between touch events and pointer events
if (e.changedTouches) {
// TouchEvent
e.button = 2; // Simulate a right button click.
// e was a touch event. It needs to pretend to be a mouse event.
e.clientX = e.changedTouches[0].clientX;
e.clientY = e.changedTouches[0].clientY;
}
// Let the gesture route the right-click correctly.
if (gesture) {
gesture.handleRightClick(e);
}
}, Blockly.LONGPRESS);
};
/**
* Nope, that's not a long-press. Either touchend or touchcancel was fired,
* or a drag hath begun. Kill the queued long-press task.
* @package
*/
Blockly.longStop_ = function() {
if (Blockly.longPid_) {
clearTimeout(Blockly.longPid_);
Blockly.longPid_ = 0;
}
};
/**
* Clear the touch identifier that tracks which touch stream to pay attention
* to. This ends the current drag/gesture and allows other pointers to be
* captured.
*/
Blockly.Touch.clearTouchIdentifier = function() {
Blockly.Touch.touchIdentifier_ = null;
};
/**
* Decide whether Blockly should handle or ignore this event.
* Mouse and touch events require special checks because we only want to deal
* with one touch stream at a time. All other events should always be handled.
* @param {!Event} e The event to check.
* @return {boolean} True if this event should be passed through to the
* registered handler; false if it should be blocked.
*/
Blockly.Touch.shouldHandleEvent = function(e) {
return !Blockly.Touch.isMouseOrTouchEvent(e) ||
Blockly.Touch.checkTouchIdentifier(e);
};
/**
* Get the touch identifier from the given event. If it was a mouse event, the
* identifier is the string 'mouse'.
* @param {!Event} e Mouse event or touch event.
* @return {string} The touch identifier from the first changed touch, if
* defined. Otherwise 'mouse'.
*/
Blockly.Touch.getTouchIdentifierFromEvent = function(e) {
return e.pointerId != undefined ? e.pointerId :
(e.changedTouches && e.changedTouches[0] &&
e.changedTouches[0].identifier !== undefined &&
e.changedTouches[0].identifier !== null) ?
e.changedTouches[0].identifier : 'mouse';
};
/**
* Check whether the touch identifier on the event matches the current saved
* identifier. If there is no identifier, that means it's a mouse event and
* we'll use the identifier "mouse". This means we won't deal well with
* multiple mice being used at the same time. That seems okay.
* If the current identifier was unset, save the identifier from the
* event. This starts a drag/gesture, during which touch events with other
* identifiers will be silently ignored.
* @param {!Event} e Mouse event or touch event.
* @return {boolean} Whether the identifier on the event matches the current
* saved identifier.
*/
Blockly.Touch.checkTouchIdentifier = function(e) {
var identifier = Blockly.Touch.getTouchIdentifierFromEvent(e);
// if (Blockly.touchIdentifier_ )is insufficient because Android touch
// identifiers may be zero.
if (Blockly.Touch.touchIdentifier_ !== undefined &&
Blockly.Touch.touchIdentifier_ !== null) {
// We're already tracking some touch/mouse event. Is this from the same
// source?
return Blockly.Touch.touchIdentifier_ == identifier;
}
if (e.type == 'mousedown' || e.type == 'touchstart' ||
e.type == 'pointerdown') {
// No identifier set yet, and this is the start of a drag. Set it and
// return.
Blockly.Touch.touchIdentifier_ = identifier;
return true;
}
// There was no identifier yet, but this wasn't a start event so we're going
// to ignore it. This probably means that another drag finished while this
// pointer was down.
return false;
};
/**
* Set an event's clientX and clientY from its first changed touch. Use this to
* make a touch event work in a mouse event handler.
* @param {!Event} e A touch event.
*/
Blockly.Touch.setClientFromTouch = function(e) {
if (Blockly.utils.string.startsWith(e.type, 'touch')) {
// Map the touch event's properties to the event.
var touchPoint = e.changedTouches[0];
e.clientX = touchPoint.clientX;
e.clientY = touchPoint.clientY;
}
};
/**
* Check whether a given event is a mouse or touch event.
* @param {!Event} e An event.
* @return {boolean} True if it is a mouse or touch event; false otherwise.
*/
Blockly.Touch.isMouseOrTouchEvent = function(e) {
return Blockly.utils.string.startsWith(e.type, 'touch') ||
Blockly.utils.string.startsWith(e.type, 'mouse') ||
Blockly.utils.string.startsWith(e.type, 'pointer');
};
/**
* Check whether a given event is a touch event or a pointer event.
* @param {!Event} e An event.
* @return {boolean} True if it is a touch event; false otherwise.
*/
Blockly.Touch.isTouchEvent = function(e) {
return Blockly.utils.string.startsWith(e.type, 'touch') ||
Blockly.utils.string.startsWith(e.type, 'pointer');
};
/**
* Split an event into an array of events, one per changed touch or mouse
* point.
* @param {!Event} e A mouse event or a touch event with one or more changed
* touches.
* @return {!Array.<!Event>} An array of mouse or touch events. Each touch
* event will have exactly one changed touch.
*/
Blockly.Touch.splitEventByTouches = function(e) {
var events = [];
if (e.changedTouches) {
for (var i = 0; i < e.changedTouches.length; i++) {
var newEvent = {
type: e.type,
changedTouches: [e.changedTouches[i]],
target: e.target,
stopPropagation: function() { e.stopPropagation(); },
preventDefault: function() { e.preventDefault(); }
};
events[i] = newEvent;
}
} else {
events.push(e);
}
return events;
};