add wheel support

lib/protocol/rdp.js

@@ -200,6 +200,7 @@ RdpClient.prototype.close = function () {
 RdpClient.prototype.sendPointerEvent = function (x, y, button, isPressed) {
 	if (!this.connected)
 		return;
+
 	var event = pdu.data.pointerEvent();
 	if (isPressed) {
 		event.obj.pointerFlags.value |= pdu.data.PointerFlag.PTRFLAGS_DOWN;
@@ -255,6 +256,9 @@ RdpClient.prototype.sendKeyEventScancode = function (code, isPressed, extended)
  * @param isPressed {boolean}
  */
 RdpClient.prototype.sendKeyEventUnicode = function (code, isPressed) {
+	if (!this.connected)
+		return;
+
 	var event = pdu.data.unicodeKeyEvent();
 	event.obj.unicode.value = code;
 
@@ -264,6 +268,39 @@ RdpClient.prototype.sendKeyEventUnicode = function (code, isPressed) {
 	this.global.sendInputEvents([event]);
 }
 
+/**
+ * Wheel mouse event
+ * @param x {integer} mouse x position
+ * @param y {integer} mouse y position
+ * @param step {integer} wheel step
+ * @param isNegative {boolean}
+ * @param isHorizontal {boolean}
+ */
+RdpClient.prototype.sendWheelEvent = function (x, y, step, isNegative, isHorizontal) {
+	if (!this.connected)
+		return;
+
+	var event = pdu.data.pointerEvent();
+	if (isHorizontal) {
+        event.obj.pointerFlags.value |= pdu.data.PointerFlag.PTRFLAGS_HWHEEL;
+	}
+    else {
+    	event.obj.pointerFlags.value |= pdu.data.PointerFlag.PTRFLAGS_WHEEL;
+    }
+
+
+	if (isNegative) {
+        event.obj.pointerFlags.value |= pdu.data.PointerFlag.PTRFLAGS_WHEEL_NEGATIVE;
+	}
+
+    event.obj.pointerFlags.value |= (step & pdu.data.PointerFlag.WheelRotationMask)
+
+    event.obj.xPos.value = x;
+    event.obj.yPos.value = y;
+
+    this.global.sendInputEvents([event]);
+}
+
 function createClient(config) {
 	return new RdpClient(config);
 };