first commit

Software/NodeJS/libs/sensors/digitalButton.js

@@ -0,0 +1,46 @@
+var DigitalInput = require('./base/digitalSensor')
+
+const buttonMode = {
+    UP: 0,
+    DOWN: 1
+}
+
+var mode = buttonMode.UP //not pressed
+
+var pressedDateTime
+var currentDateTime
+var milliseconds
+
+//digital button, can throw singlepress and longpress events
+function DigitalButton(pin, longPressDelay) {
+    DigitalInput.apply(this, Array.prototype.slice.call(arguments))
+    this.longPressDelay = longPressDelay || 1100
+    this.on('change', function (res) {
+        //user presses the button for the first time
+        if (res == 1 && mode === buttonMode.UP) {
+            pressedDateTime = new Date()
+            mode = buttonMode.DOWN
+            return
+        }
+        //user continues to press the button
+        else if (res == 1 && mode === buttonMode.DOWN) {
+            //do nothing
+            return
+        } else { //res == 0 so user has lifted her finger
+            currentDateTime = new Date()
+            milliseconds = currentDateTime.getTime() - pressedDateTime.getTime()
+            //if less than longPressDelay milliseconds
+            if (milliseconds <= this.longPressDelay) {
+                this.emit('down', 'singlepress')
+            } else {
+                this.emit('down', 'longpress')
+            }
+            //reset the mode
+            mode = buttonMode.UP
+        }
+    });
+}
+
+DigitalButton.prototype = new DigitalInput()
+
+module.exports = DigitalButton