--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ginebra2/chrome/js/LongPress.js	Tue May 04 12:39:35 2010 +0300
@@ -0,0 +1,83 @@
+//
+// Use LongPress() to set a function callback for a long-press on a particular DOM element.
+//   Parameters:
+//      elementId: id string of the element
+//      callback: the function to be called when the long-press fires
+//      mouseDownCallback: the function to be called on mouse-down
+//   Example:
+//        <javascript ...> 
+//          new LongPress("btnId", function(el) { alert("hello"); });
+//        </javascript>
+//        ...
+//        <img id="btnId" ... />
+//
+function LongPress(elementId, callback, mouseDownCallback) {
+    this.el = document.getElementById(elementId);
+    this.callback = callback;
+    this.initialX = 0;
+    this.initialY = 0;
+    this.mouseDownCallback = mouseDownCallback;
+
+	if(!this.el) {
+		window.app.debug("LongPress: element " + elementId + " not found");
+		return;
+	}
+
+    this.onTimerFired = function() {
+        window.app.debug("onTimerFired");
+        this.callback(this.el);
+        this.cancelTimer();
+        this.unregisterMouseMove();
+    }
+
+    this.startTimer = function() {
+        this.cancelTimer();
+        this.timer = window.setTimeout(createDelegate(this, this.onTimerFired), 1000);
+	}
+
+    this.cancelTimer = function() {
+        if(this.timer) {
+            window.clearTimeout(this.timer);
+            this.timer = null;
+        }
+    }
+
+    // Stop tracking mouse movements.
+    this.unregisterMouseMove= function() {
+        this.el.onmousemove = null;
+    }
+
+    this.cancel = function() {
+        //window.app.debug("cancel");
+        this.cancelTimer();
+        this.unregisterMouseMove();
+    }
+
+    // If the mouse has moved too much it's not considered a long press, so cancel.
+    this.onMouseMove = function() {
+        //window.app.debug("LongPress::onMouseMove " + this + " event=" + window.event +
+        //                    " " + window.event.clientX + "," + window.event.clientY);
+        if(Math.abs(this.initialX - window.event.clientX) > 4 ||
+           Math.abs(this.initialY - window.event.clientY) > 4) {
+            this.cancel();
+        }
+    }
+
+    // Start tracking the mouse and save the initial mouse coords.
+    this.onMouseDown = function() {
+        window.app.debug("LongPress::onMouseDown " + this);
+        this.isDown = true;
+        this.initialX = window.event.clientX;
+        this.initialY = window.event.clientY;
+        this.el.onmousemove = this.onMouseMove.bind(this);
+        this.startTimer();
+        if(this.mouseDownCallback != undefined)
+            this.mouseDownCallback(this);
+    }
+
+	this.el.onmousedown = this.onMouseDown.bind(this);
+
+    // Cancel tracking on mouse up and out events, ie. not a long press.
+	this.el.onmouseup = this.cancel.bind(this);
+	this.el.onmouseout = this.cancel.bind(this);
+}