Make the underlying transport mechanism of the webchannel pluggable.

This enables us to optionally use navigator.qt instead of a WebSocket,
which is nicer setup-wise and is also slightly faster:

navigator.qt:
284.0 msecs per iteration (total: 2,840, iterations: 10)
WebSocket:
295.8 msecs per iteration (total: 2,959, iterations: 10)

The baseline is ca. 203 msecs, which would mean a performance boost
of ca. 12.7%.

Furthermore, this sets the fundation to eventually add a WebEngine
transport mechanism. The WebViewTransport should also be removed and
instead the WebView itself should directly implement the
WebChannelTransportInterface.

Change-Id: I368bb27e38ffa2f17ffeb7f5ae695690f6f5ad21
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>

3 files changed, 14 insertions, 8 deletions

diff --git a/examples/qml/example.qml b/examples/qml/example.qml
index f77b4c6..2d51f27 100644
--- a/examples/qml/example.qml
+++ b/examples/qml/example.qml
@@ -58,8 +58,11 @@ ApplicationWindow {
     WebChannel {
         id: webChannel
 
-        onRawMessageReceived: {
-            textEdit.text += "Received message: " + rawMessage + "\n";
+        connections: WebViewTransport {
+            webViewExperimental: webView.experimental
+            onMessageReceived: {
+                textEdit.text += "Received message: " + message + "\n";
+            }
         }
     }
 
@@ -106,8 +109,9 @@ ApplicationWindow {
             Layout.fillHeight: true
             Layout.minimumWidth: window.width / 2
             id: webView
-            url: webChannel.baseUrl ? ("index.html?webChannelBaseUrl=" + webChannel.baseUrl) : "about:blank"
+            url: "index.html"
             experimental.preferences.developerExtrasEnabled: true
+            experimental.preferences.navigatorQtObjectEnabled: true
         }
     }
 }
diff --git a/examples/qml/index.html b/examples/qml/index.html
index cd20ac9..8b65dd2 100644
--- a/examples/qml/index.html
+++ b/examples/qml/index.html
@@ -5,8 +5,7 @@
         <script type="text/javascript" src="qrc:///qwebchannel/qwebchannel.js"></script>
         <script type="text/javascript">
             //BEGIN SETUP
-            var baseUrl = (/[?&]webChannelBaseUrl=([A-Za-z0-9\-:/\.]+)/.exec(location.search)[1]);
-            new QWebChannel(baseUrl, function(channel) {
+            new QWebChannel(navigator.qt, function(channel) {
                 document.getElementById("send").onclick = function() {
                     var input = document.getElementById("input");
                     var text = input.value;
diff --git a/examples/standalone/main.cpp b/examples/standalone/main.cpp
index 8546a12..836d324 100644
--- a/examples/standalone/main.cpp
+++ b/examples/standalone/main.cpp
@@ -40,6 +40,7 @@
 ****************************************************************************/
 
 #include "qwebchannel.h"
+#include "qwebsockettransport.h"
 
 #include <QApplication>
 #include <QDialog>
@@ -55,14 +56,14 @@ class Dialog : public QObject
     Q_OBJECT
 
 public:
-    explicit Dialog(QWebChannel *channel, QObject *parent = 0)
+    explicit Dialog(QWebSocketTransport *transport, QObject *parent = 0)
         : QObject(parent)
     {
         ui.setupUi(&dialog);
         dialog.show();
 
         connect(ui.send, SIGNAL(clicked()), SLOT(clicked()));
-        connect(channel, SIGNAL(baseUrlChanged(QString)),
+        connect(transport, SIGNAL(baseUrlChanged(QString)),
                 SLOT(baseUrlChanged(QString)));
     }
 
@@ -109,8 +110,10 @@ int main(int argc, char** argv)
     QApplication app(argc, argv);
 
     QWebChannel channel;
+    QWebSocketTransport transport;
+    channel.connectTo(&transport);
 
-    Dialog dialog(&channel);
+    Dialog dialog(&transport);
 
     channel.registerObject(QStringLiteral("dialog"), &dialog);