Register C++ types declaratively

Adapt to the new way of registering C++ types. The types need to be
seen at compile time so that code can be generated that invokes them.

This patch:

- Adds QML_* macros where applicable.
- Adapts the build system files to the new way of registering modules.
- Splits up the QtQuick.Controls[.*].impl files into their own plugins,
  as we can only register one QML module per .pro file.
- Removes C++ type registration calls in every plugin.
- Moves private types from src/quickcontrols2/quickcontrols2.pro
  to src/quickcontrols2/impl/quickcontrols2-impl.pro. Some of these
  types need to be exposed to QML, but quickcontrols2.pro is already in
  use to declare the QtQuick.Controls import (and also provides the
  public C++ QQuickStyle API), and the new QML_IMPORT_NAME/VERSION
  syntax only allows one module per project. As some of the types that
  need to be exposed to QML are also referenced by some C++ code (e.g.
  tests, etc.), we just move all of the private types to the new
  library.

Follow-up patches will register the QML types declaratively.

Task-number: QTBUG-82922
Change-Id: Iaf9ee106237d61701d57a8896f3822304c8151a6
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

1 files changed, 88 insertions, 0 deletions

diff --git a/src/imports/controls/fusion/impl/qquickfusionknob.cpp b/src/imports/controls/fusion/impl/qquickfusionknob.cpp
new file mode 100644
index 00000000..a641d190
--- /dev/null
+++ b/src/imports/controls/fusion/impl/qquickfusionknob.cpp
@@ -0,0 +1,88 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Quick Controls 2 module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/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 "qquickfusionknob_p.h"
+
+#include <QtCore/qmath.h>
+#include <QtGui/qpainter.h>
+#include <QtQuick/private/qquickpalette_p.h>
+#include <QtQuick/private/qquickitem_p.h>
+
+QT_BEGIN_NAMESPACE
+
+QQuickFusionKnob::QQuickFusionKnob(QQuickItem *parent)
+    : QQuickPaintedItem(parent)
+{
+    connect(this, &QQuickItem::paletteChanged, this, [this](){ update(); });
+}
+
+// extracted from QStyleHelper::drawDial()
+void QQuickFusionKnob::paint(QPainter *painter)
+{
+    const qreal w = width();
+    const qreal h = height();
+    if (w <= 0 || h <= 0)
+        return;
+
+    QColor color = QQuickItemPrivate::get(this)->palette()->button();
+    color.setHsv(color.hue(),
+                 qMin(140, color .saturation()),
+                 qMax(180, color.value()));
+    color = color.lighter(104);
+    color.setAlphaF(qreal(0.8));
+
+    const qreal sz = qMin(w, h);
+    QRectF rect(0, 0, sz, sz);
+    rect.moveCenter(QPointF(w / 2.0, h / 2.0));
+    const QPointF center = rect.center();
+
+    QRadialGradient gradient(center.x() + rect.width() / 2,
+                             center.y() + rect.width(),
+                             rect.width() * 2,
+                             center.x(), center.y());
+    gradient.setColorAt(1, color.darker(140));
+    gradient.setColorAt(qreal(0.4), color.darker(120));
+    gradient.setColorAt(0, color.darker(110));
+
+    painter->setRenderHint(QPainter::Antialiasing);
+    painter->setBrush(gradient);
+    painter->setPen(QColor(255, 255, 255, 150));
+    painter->drawEllipse(rect);
+    painter->setPen(QColor(0, 0, 0, 80));
+    painter->drawEllipse(rect.adjusted(1, 1, -1, -1));
+}
+
+QT_END_NAMESPACE