Add support for custom styles and runtime change of style

Styles can now co-exist in plugin resources and file system.
All the built-in styles are now embedded into plugin resources
and therefore available at runtime. Furthermore, custom styles
can be installed independently to the target system by copying
them into Styles directory:

$$[QT_INSTALL_QML]/QtQuick/Enterprise/VirtualKeyboard/Styles

The default built-in style is still configured at build time
and changed with CONFIG+=retro-style as before.

The runtime style can be changed by setting an environment
variable QT_VIRTUALKEYBOARD_STYLE to the name of the style.
The style name can be one of the built-in styles or custom
styles currently available in the system. However, there is
an limitation that the custom style cannot have the same
name as any of the built-in styles.

Added new child module QtQuick.Enterprise.VirtualKeyboard.Settings,
which provides VirtualKeyboardSettings instance.

Change-Id: Ide076529c2c6d6944d8c0532d0b5daa5a56cae76
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>

1 files changed, 76 insertions, 0 deletions

diff --git a/src/virtualkeyboard/settings.cpp b/src/virtualkeyboard/settings.cpp
new file mode 100644
index 00000000..2e1f29e9
--- /dev/null
+++ b/src/virtualkeyboard/settings.cpp
@@ -0,0 +1,76 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc
+** All rights reserved.
+** For any questions to Digia, please use contact form at http://qt.digia.com
+**
+** This file is part of the Qt Virtual Keyboard add-on for Qt Enterprise.
+**
+** Licensees holding valid Qt Enterprise licenses may use this file in
+** accordance with the Qt Enterprise License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.
+**
+** If you have questions regarding the use of this file, please use
+** contact form at http://qt.digia.com
+**
+****************************************************************************/
+
+#include "settings.h"
+#include <QtCore/private/qobject_p.h>
+
+class SettingsPrivate : public QObjectPrivate
+{
+public:
+    SettingsPrivate() :
+        QObjectPrivate(),
+        style(),
+        styleName() {}
+
+    QString style;
+    QString styleName;
+};
+
+static QScopedPointer<Settings> s_settingsInstance;
+
+Settings::Settings(QObject *parent) :
+    QObject(*new SettingsPrivate(), parent)
+{
+}
+
+Settings *Settings::instance()
+{
+    if (!s_settingsInstance)
+        s_settingsInstance.reset(new Settings());
+    return s_settingsInstance.data();
+}
+
+QString Settings::style() const
+{
+    Q_D(const Settings);
+    return d->style;
+}
+
+void Settings::setStyle(const QString &style)
+{
+    Q_D(Settings);
+    if (d->style != style) {
+        d->style = style;
+        emit styleChanged();
+    }
+}
+
+QString Settings::styleName() const
+{
+    Q_D(const Settings);
+    return d->styleName;
+}
+
+void Settings::setStyleName(const QString &styleName)
+{
+    Q_D(Settings);
+    if (d->styleName != styleName) {
+        d->styleName = styleName;
+        emit styleNameChanged();
+    }
+}