Add QML download API

This patch exposes downloadStarted and downloadFinished
signals on the WebEngineProfile to notify about downloads.
The WebEngineDownloadItem exposes a subset of Chromium's
content::DownloadItem functionality.
For now we expose minimal requirements to be able to control
downloads in QML but this can be extended in the future.
This patch also adds a DownloadView to quicktestbrowser
to demonstrate the usage of the new API.

[ChangeLog][QtWebEngineQML] Add QtQuick download API

Change-Id: I8d8f0daf02c4e0151000427fc2a4b37d28b9db52
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>

1 files changed, 134 insertions, 0 deletions

diff --git a/src/webengine/api/qquickwebenginedownloaditem.cpp b/src/webengine/api/qquickwebenginedownloaditem.cpp
new file mode 100644
index 000000000..729cb0d3f
--- /dev/null
+++ b/src/webengine/api/qquickwebenginedownloaditem.cpp
@@ -0,0 +1,134 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtWebEngine module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qquickwebenginedownloaditem_p.h"
+#include "qquickwebenginedownloaditem_p_p.h"
+
+QT_BEGIN_NAMESPACE
+
+QQuickWebEngineDownloadItemPrivate::QQuickWebEngineDownloadItemPrivate(QQuickWebEngineProfilePrivate *p)
+    : profile(p)
+    , downloadStarted(false)
+    , downloadId(-1)
+    , downloadState(QQuickWebEngineDownloadItem::DownloadCancelled)
+    , downloadProgress(0)
+{
+}
+
+QQuickWebEngineDownloadItemPrivate::~QQuickWebEngineDownloadItemPrivate()
+{
+    Q_Q(QQuickWebEngineDownloadItem);
+    q->cancel();
+}
+
+void QQuickWebEngineDownloadItemPrivate::update(QQuickWebEngineDownloadItem::DownloadState state, int progress)
+{
+    Q_Q(QQuickWebEngineDownloadItem);
+    if (state != downloadState) {
+        downloadState = state;
+        Q_EMIT q->stateChanged();
+    }
+    if (progress != downloadProgress) {
+        downloadProgress = progress;
+        Q_EMIT q->progressChanged();
+    }
+}
+
+void QQuickWebEngineDownloadItem::cancel()
+{
+    Q_D(QQuickWebEngineDownloadItem);
+
+    if (d->downloadState == QQuickWebEngineDownloadItem::DownloadCompleted
+            || d->downloadState == QQuickWebEngineDownloadItem::DownloadCancelled)
+        return;
+
+    d->update(QQuickWebEngineDownloadItem::DownloadCancelled, d->downloadProgress);
+
+    // We directly cancel the download if the user cancels before
+    // it even started, so no need to notify the profile here.
+    if (d->downloadStarted)
+        d->profile->cancelDownload(d->downloadId);
+}
+
+quint32 QQuickWebEngineDownloadItem::id()
+{
+    Q_D(QQuickWebEngineDownloadItem);
+    return d->downloadId;
+}
+
+QQuickWebEngineDownloadItem::DownloadState QQuickWebEngineDownloadItem::state()
+{
+    Q_D(QQuickWebEngineDownloadItem);
+    return d->downloadState;
+}
+
+int QQuickWebEngineDownloadItem::progress()
+{
+    Q_D(QQuickWebEngineDownloadItem);
+    return d->downloadProgress;
+}
+
+QString QQuickWebEngineDownloadItem::path()
+{
+    Q_D(QQuickWebEngineDownloadItem);
+    return d->downloadPath;
+}
+
+void QQuickWebEngineDownloadItem::setPath(QString path)
+{
+    Q_D(QQuickWebEngineDownloadItem);
+    if (d->downloadStarted) {
+        qWarning("Setting the download path is not allowed after the download has been started.");
+        return;
+    }
+    if (d->downloadPath != path) {
+        d->downloadPath = path;
+        Q_EMIT pathChanged();
+    }
+}
+
+QQuickWebEngineDownloadItem::QQuickWebEngineDownloadItem(QQuickWebEngineDownloadItemPrivate *p, QObject *parent)
+    : QObject(parent)
+    , d_ptr(p)
+{
+    p->q_ptr = this;
+}
+
+QQuickWebEngineDownloadItem::~QQuickWebEngineDownloadItem()
+{
+}
+
+QT_END_NAMESPACE