Add paste from clipboard option to VTX tab

src/js/Clipboard.js

@@ -0,0 +1,111 @@
+'use strict';
+
+/**
+ * Encapsulates the Clipboard logic, depending on web or nw
+ *
+ */
+var Clipboard = {
+    _nwClipboard: null,
+    available : null,
+    readAvailable : null,
+    writeAvailable : null,
+    writeText : null,
+    readText : null
+};
+
+Clipboard._configureClipboardAsNwJs = function(nwGui) {
+
+    console.log('NW GUI Clipboard available');
+
+    this.available = true;
+    this.readAvailable = true;
+    this.writeAvailable = true;
+    this._nwClipboard = nwGui.Clipboard.get();
+
+    this.writeText = function(text, onSuccess, onError) {
+        try {
+
+            this._nwClipboard.set(text, "text");
+
+        } catch (err) {
+            if (onError) {
+                onError(err);
+            }
+        }
+
+        if (onSuccess) {
+            onSuccess(text);
+        }
+    }
+
+    this.readText = function(onSuccess, onError) {
+
+        let text = '';
+        try {
+
+            text = this._nwClipboard.get("text");
+
+        } catch (err) {
+            if (onError) {
+                onError(err);
+            }
+        }
+
+        if (onSuccess) {
+            onSuccess(text);
+        }
+    }
+}
+
+Clipboard._configureClipboardAsChrome = function() {
+
+    console.log('Chrome Clipboard available');
+
+    this.available = true;
+    this.readAvailable = false; // FIXME: for some reason the read is not working
+    this.writeAvailable = true;
+
+    this.writeText = function(text, onSuccess, onError) {
+        navigator.clipboard.writeText(text)
+        .then(onSuccess)
+        .catch(onError);
+    }
+
+    this.readText = function(onSuccess, onError) {
+        navigator.clipboard.readText()
+            .then(onSuccess)
+            .catch(onError);
+    }
+
+}
+
+Clipboard._configureClipboardAsOther = function() {
+
+    console.warn('NO Clipboard available');
+
+    this.available = false;
+    this.readAvailable = false;
+    this.writeAvailable = false;
+
+    this.writeText = function(text, onSuccess, onError) {
+        onError('Clipboard not available');
+    }
+
+    this.readText = function(onSuccess, onError) {
+        onError('Clipboard not available');
+    }
+}
+
+
+switch (GUI.Mode) {
+case GUI_Modes.NWJS:
+    Clipboard._configureClipboardAsNwJs(GUI.nwGui);
+    break;
+
+case GUI_Modes.ChromeApp:
+    Clipboard._configureClipboardAsChrome();
+    break;
+
+default:
+    Clipboard._configureClipboardAsOther();
+}