var guac_mouse = this;
/**
+ * The distance a two-finger touch must move per scrollwheel event, relative
+ * to the distance between the two touches.
+ */
+ this.scrollThreshold = 0.5;
+
+ /**
+ * The maximum number of milliseconds to wait for a touch to end for the
+ * gesture to be considered a click.
+ */
+ this.clickTimingThreshold = 250;
+
+ /**
+ * The maximum number of pixels to allow a touch to move for the gesture to
+ * be considered a click.
+ */
+ this.clickMoveThreshold = 10 * (window.displayPixelRatio || 1);
+
+ /**
* The current mouse state. The properties of this state are updated when
* mouse events fire. This state object is also passed in as a parameter to
* the handler of any mouse events.
// This is all JUST so we can get the mouse position within the element
var parent = element.offsetParent;
while (parent) {
- if (parent.offsetLeft && parent.offsetTop) {
+
+ if (parent.offsetLeft)
guac_mouse.currentState.x -= parent.offsetLeft;
+
+ if (parent.offsetTop)
guac_mouse.currentState.y -= parent.offsetTop;
- }
+
parent = parent.offsetParent;
}
}, false);
+ var touch_count = 0;
var last_touch_x = 0;
var last_touch_y = 0;
var last_touch_time = 0;
var pixels_moved = 0;
+ var touch_distance = 0;
+
+ var touch_buttons = {
+ 1: "left",
+ 2: "right",
+ 3: "middle"
+ };
var gesture_in_progress = false;
var click_release_timeout = null;
element.addEventListener("touchend", function(e) {
- // If we're handling a gesture
- if (gesture_in_progress) {
+ // If we're handling a gesture AND this is the last touch
+ if (gesture_in_progress && e.touches.length == 0) {
cancelEvent(e);
var time = new Date().getTime();
+ // Get corresponding mouse button
+ var button = touch_buttons[touch_count];
+
// If mouse already down, release anad clear timeout
- if (guac_mouse.currentState.left) {
+ if (guac_mouse.currentState[button]) {
- // Fire left button up event
- guac_mouse.currentState.left = false;
+ // Fire button up event
+ guac_mouse.currentState[button] = false;
if (guac_mouse.onmouseup)
guac_mouse.onmouseup(guac_mouse.currentState);
}
// If single tap detected (based on time and distance)
- if (time - last_touch_time <= 250 && pixels_moved < 10) {
+ if (time - last_touch_time <= guac_mouse.clickTimingThreshold
+ && pixels_moved < guac_mouse.clickMoveThreshold) {
- // Fire left button down event
- guac_mouse.currentState.left = true;
+ // Fire button down event
+ guac_mouse.currentState[button] = true;
if (guac_mouse.onmousedown)
guac_mouse.onmousedown(guac_mouse.currentState);
// touchstart within timeout.
click_release_timeout = window.setTimeout(function() {
- // Fire left button up event
- guac_mouse.currentState.left = false;
+ // Fire button up event
+ guac_mouse.currentState[button] = false;
if (guac_mouse.onmouseup)
guac_mouse.onmouseup(guac_mouse.currentState);
// Allow mouse events now that touching is over
gesture_in_progress = false;
- }, 250);
+ }, guac_mouse.clickTimingThreshold);
}
element.addEventListener("touchstart", function(e) {
- // Record initial touch location and time for single-touch movement
+ // Track number of touches, but no more than three
+ touch_count = Math.min(e.touches.length, 3);
+
+ // Record initial touch location and time for touch movement
// and tap gestures
if (e.touches.length == 1) {
// Record touch location and time
var starting_touch = e.touches[0];
- last_touch_x = starting_touch.pageX;
- last_touch_y = starting_touch.pageY;
+ last_touch_x = starting_touch.screenX;
+ last_touch_y = starting_touch.screenY;
last_touch_time = new Date().getTime();
pixels_moved = 0;
- // TODO: Handle different buttons
+ }
+ else if (e.touches.length == 2) {
+ var diff_x = e.touches[0].screenX - e.touches[1].screenX;
+ var diff_y = e.touches[0].screenY - e.touches[1].screenY;
+ touch_distance = Math.sqrt(diff_x*diff_x + diff_y*diff_y);
}
}, false);
element.addEventListener("touchmove", function(e) {
- // Handle single-touch movement gesture (touchpad mouse move)
- if (e.touches.length == 1) {
+ cancelEvent(e);
- cancelEvent(e);
+ // Get change in touch location
+ var touch = e.touches[0];
+ var delta_x = touch.screenX - last_touch_x;
+ var delta_y = touch.screenY - last_touch_y;
- // Get change in touch location
- var touch = e.touches[0];
- var delta_x = touch.pageX - last_touch_x;
- var delta_y = touch.pageY - last_touch_y;
+ // Track pixels moved
+ pixels_moved += Math.abs(delta_x) + Math.abs(delta_y);
- // Track pixels moved
- pixels_moved += Math.abs(delta_x) + Math.abs(delta_y);
+ // If only one touch involved, this is mouse move
+ if (touch_count == 1) {
// Update mouse location
guac_mouse.currentState.x += delta_x;
guac_mouse.onmousemove(guac_mouse.currentState);
// Update touch location
- last_touch_x = touch.pageX;
- last_touch_y = touch.pageY;
+ last_touch_x = touch.screenX;
+ last_touch_y = touch.screenY;
+
+ }
+
+ // Interpret two-finger touch as scrollwheel
+ else if (touch_count == 2) {
+
+ // If change in location passes threshold for scroll
+ if (Math.abs(delta_y) >= touch_distance * guac_mouse.scrollThreshold) {
+
+ // Decide button based on Y movement direction
+ var button;
+ if (delta_y > 0) button = "down";
+ else button = "up";
+
+ // Fire button down event
+ guac_mouse.currentState[button] = true;
+ if (guac_mouse.onmousedown)
+ guac_mouse.onmousedown(guac_mouse.currentState);
+
+ // Fire button up event
+ guac_mouse.currentState[button] = false;
+ if (guac_mouse.onmouseup)
+ guac_mouse.onmouseup(guac_mouse.currentState);
+
+ // Only update touch location after a scroll has been
+ // detected
+ last_touch_x = touch.screenX;
+ last_touch_y = touch.screenY;
+
+ }
}
guac_mouse.onmouseup(guac_mouse.currentState);
}
- }, true);
+ }, false);
// Override selection on mouse event element.
element.addEventListener("selectstart", function(e) {
}, false);
// Scroll wheel support
- element.addEventListener('DOMMouseScroll', function(e) {
+ function mousewheel_handler(e) {
// Don't handle if we aren't supposed to
if (gesture_in_progress) return;
cancelEvent(e);
- }, false);
+ }
+ element.addEventListener('DOMMouseScroll', mousewheel_handler, false);
+ element.addEventListener('mousewheel', mousewheel_handler, false);
};
projects / guacamole-common-js.git / blobdiff