Translate pointer events into touch events.

lib/units/device/plugins/vnc/util/pointertranslator.js

@@ -0,0 +1,66 @@
+var util = require('util')
+
+var EventEmitter = require('eventemitter3').EventEmitter
+
+function PointerTranslator() {
+  this.previousEvent = null
+}
+
+util.inherits(PointerTranslator, EventEmitter)
+
+PointerTranslator.prototype.push = function(event) {
+  if (event.buttonMask & 0xFE) {
+    // Non-primary buttons included, ignore.
+    return
+  }
+
+  if (this.previousEvent) {
+    var buttonChanges = event.buttonMask ^ this.previousEvent.buttonMask
+
+    // If the primary button changed, we have an up/down event.
+    if (buttonChanges & 1) {
+      // If it's pressed now, that's a down event.
+      if (event.buttonMask & 1) {
+        this.emit('touchdown', {
+          contact: 1
+        , x: event.xPosition
+        , y: event.yPosition
+        })
+        this.emit('touchcommit')
+      }
+      // It's not pressed, so we have an up event.
+      else {
+        this.emit('touchup', {
+          contact: 1
+        })
+        this.emit('touchcommit')
+      }
+    }
+    // Otherwise, if we're still holding the primary button down,
+    // that's a move event.
+    else if (event.buttonMask & 1) {
+      this.emit('touchmove', {
+        contact: 1
+      , x: event.xPosition
+      , y: event.yPosition
+      })
+      this.emit('touchcommit')
+    }
+  }
+  else {
+    // If it's the first event we get and the primary button's pressed,
+    // it's a down event.
+    if (event.buttonMask & 1) {
+      this.emit('touchdown', {
+        contact: 1
+      , x: event.xPosition
+      , y: event.yPosition
+      })
+      this.emit('touchcommit')
+    }
+  }
+
+  this.previousEvent = event
+}
+
+module.exports = PointerTranslator