iOS Style: Add QQuickIOSTheme

Add QQuickIOSTheme to initialize the QQuickTheme and set a palette with
the appropriate colors for the iOS style. Use the UIKit's API to get
correct colors in iOS, but hardcode them for macOS, just so we can keep
compiling the iOS style on macOS too.

Note: Ideally, we would use the QPlatformTheme (QIOSTheme) to do this,
but we use a fusion style palette in there because we use the Fusion
style on iOS for widget applications. In the future, we could revisit
this and set a "native-looking" palette to the QIOSTheme, like we are
doing now for the QQuickIOSTheme.

Change-Id: I661ffe5ac3d57b750994f7b46abb9502fd311f44
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

4 files changed, 160 insertions, 1 deletions

diff --git a/src/quickcontrols2/ios/CMakeLists.txt b/src/quickcontrols2/ios/CMakeLists.txt
index 3815401573..590d95fee7 100644
--- a/src/quickcontrols2/ios/CMakeLists.txt
+++ b/src/quickcontrols2/ios/CMakeLists.txt
@@ -24,6 +24,7 @@ qt_internal_add_qml_module(qtquickcontrols2iosstyleplugin
     SOURCES
         qtquickcontrols2iosstyleplugin.cpp
         qquickiosstyle.cpp qquickiosstyle_p.h
+        qquickiostheme_p.h qquickiostheme.mm
     QML_FILES
         ${qml_files}
     DEFINES
@@ -39,6 +40,11 @@ qt_internal_add_qml_module(qtquickcontrols2iosstyleplugin
         Qt::QuickControls2ImplPrivate
 )
 
+qt_internal_extend_target(Core CONDITION APPLE AND IOS
+    LIBRARIES
+        ${FWUIKit}
+)
+
 file(GLOB resource_glob RELATIVE "${CMAKE_CURRENT_SOURCE_DIR}" "images/*.png")
 foreach(file IN LISTS resource_glob_0)
     set_source_files_properties("${CMAKE_CURRENT_SOURCE_DIR}/${file}" PROPERTIES QT_RESOURCE_ALIAS "${file}")
diff --git a/src/quickcontrols2/ios/qquickiostheme.mm b/src/quickcontrols2/ios/qquickiostheme.mm
new file mode 100644
index 0000000000..9df29435f7
--- /dev/null
+++ b/src/quickcontrols2/ios/qquickiostheme.mm
@@ -0,0 +1,82 @@
+/****************************************************************************
+**
+** Copyright (C) 2022 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the Qt Quick Controls 2 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 The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://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.LGPL3 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-3.0.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 (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qquickiostheme_p.h"
+
+#include <QtGui/private/qcoregraphics_p.h>
+
+#ifdef Q_OS_IOS
+#include <UIKit/UIInterface.h>
+#endif
+
+#include <QtQuickTemplates2/private/qquicktheme_p.h>
+
+QT_BEGIN_NAMESPACE
+
+void QQuickIOSTheme::initialize(QQuickTheme *theme)
+{
+    QPalette systemPalette;
+
+    QColor blue;
+    QColor white;
+    QColor disabled;
+#ifdef Q_OS_IOS
+    blue = qt_mac_toQColor(UIColor.systemBlueColor.CGColor);
+    disabled = qt_mac_toQColor(UIColor.tertiarySystemFillColor.CGColor);
+    white = qt_mac_toQColor(UIColor.whiteColor.CGColor);
+#else
+    blue = QColor(qRgba(0, 122, 255, 255));
+    white = QColor(qRgba(255, 255, 255, 255));
+    disabled = QColor(qRgba(118, 118, 128, 31));
+#endif
+    systemPalette.setColor(QPalette::Active, QPalette::Button, blue);
+    systemPalette.setColor(QPalette::Disabled, QPalette::Button, disabled);
+    systemPalette.setColor(QPalette::Active, QPalette::ButtonText, white);
+
+    white.setAlphaF(0.5);
+    systemPalette.setColor(QPalette::Disabled, QPalette::ButtonText, white);
+
+    blue.setAlphaF(0.8);
+    systemPalette.setColor(QPalette::Highlight, blue);
+
+    theme->setPalette(QQuickTheme::System, systemPalette);
+}
+
+QT_END_NAMESPACE
+
diff --git a/src/quickcontrols2/ios/qquickiostheme_p.h b/src/quickcontrols2/ios/qquickiostheme_p.h
new file mode 100644
index 0000000000..ca75c55c20
--- /dev/null
+++ b/src/quickcontrols2/ios/qquickiostheme_p.h
@@ -0,0 +1,68 @@
+/****************************************************************************
+**
+** Copyright (C) 2022 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the Qt Quick Controls 2 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 The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://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.LGPL3 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-3.0.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 (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QQUICKIOSTHEME_P_H
+#define QQUICKIOSTHEME_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/qglobal.h>
+
+QT_BEGIN_NAMESPACE
+
+class QQuickTheme;
+
+class QQuickIOSTheme
+{
+public:
+    static void initialize(QQuickTheme *theme);
+};
+
+QT_END_NAMESPACE
+
+#endif // QQUICKIOSTHEME_P_H
diff --git a/src/quickcontrols2/ios/qtquickcontrols2iosstyleplugin.cpp b/src/quickcontrols2/ios/qtquickcontrols2iosstyleplugin.cpp
index ea95b9a3b8..dda8221556 100644
--- a/src/quickcontrols2/ios/qtquickcontrols2iosstyleplugin.cpp
+++ b/src/quickcontrols2/ios/qtquickcontrols2iosstyleplugin.cpp
@@ -38,6 +38,7 @@
 ****************************************************************************/
 
 #include "qquickiosstyle_p.h"
+#include "qquickiostheme_p.h"
 
 #include <QtCore/qloggingcategory.h>
 #include <QtQml/qqml.h>
@@ -59,6 +60,8 @@ public:
 
     QString name() const override;
     void initializeTheme(QQuickTheme *theme) override;
+
+    QQuickIOSTheme m_theme;
 };
 
 QtQuickControls2IOSStylePlugin::QtQuickControls2IOSStylePlugin(QObject *parent) : QQuickStylePlugin(parent)
@@ -74,7 +77,7 @@ QString QtQuickControls2IOSStylePlugin::name() const
 
 void QtQuickControls2IOSStylePlugin::initializeTheme(QQuickTheme *theme)
 {
-    Q_UNUSED(theme);
+    m_theme.initialize(theme);
 }
 
 QT_END_NAMESPACE