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Set scroll and click thresholds relative to screen pixel density (if readable) and size of gesture.

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This commit is contained in:
Michael Jumper
2012-04-01 18:20:18 -07:00
parent dcf55cbd75
commit 818f081bb5
1 changed files with 14 additions and 7 deletions
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21
guacamole-common-js/src/main/resources/mouse.js
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@@ -59,10 +59,10 @@ Guacamole.Mouse = function(element) {
var guac_mouse = this;
/**
* The number of pixels a touch must move for it to be considered a scroll
* wheel event.
* The distance a two-finger touch must move per scrollwheel event, relative
* to the distance between the two touches.
*/
this.scrollThreshold = 20;
this.scrollThreshold = 0.5;
/**
* The maximum number of milliseconds to wait for a touch to end for the
@@ -74,7 +74,7 @@ Guacamole.Mouse = function(element) {
* The maximum number of pixels to allow a touch to move for the gesture to
* be considered a click.
*/
this.clickMoveThreshold = 10;
this.clickMoveThreshold = 10 * (window.displayPixelRatio || 1);
/**
* The current mouse state. The properties of this state are updated when
@@ -166,6 +166,7 @@ Guacamole.Mouse = function(element) {
var last_touch_y = 0;
var last_touch_time = 0;
var pixels_moved = 0;
var touch_distance = 0;
var touch_buttons = {
1: "left",
@@ -262,6 +263,12 @@ Guacamole.Mouse = function(element) {
}
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) {
@@ -305,11 +312,11 @@ Guacamole.Mouse = function(element) {
}
// Otherwise, interpret as scrollwheel
else {
// Interpret two-finger touch as scrollwheel
else if (touch_count == 2) {
// If change in location passes threshold for scroll
if (Math.abs(delta_y) >= guac_mouse.scrollThreshold) {
if (Math.abs(delta_y) >= touch_distance * guac_mouse.scrollThreshold) {
// Decide button based on Y movement direction
var button;