Doc: add snippets and screenshots for the Universal attached properties

Ideas and descriptions shamelessly stolen from f26f855, which did the
same for the Material style.

Change-Id: Ibab47d1370c56de4104dc2bf549870335c639257
Task-number: QTBUG-55904
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

9 files changed, 219 insertions, 26 deletions

diff --git a/src/imports/controls/doc/images/qtquickcontrols2-universal-accent.png b/src/imports/controls/doc/images/qtquickcontrols2-universal-accent.png
new file mode 100644
index 00000000..be1a4a89
--- /dev/null
+++ b/src/imports/controls/doc/images/qtquickcontrols2-universal-accent.png
diff --git a/src/imports/controls/doc/images/qtquickcontrols2-universal-background.png b/src/imports/controls/doc/images/qtquickcontrols2-universal-background.png
new file mode 100644
index 00000000..c91ab14d
--- /dev/null
+++ b/src/imports/controls/doc/images/qtquickcontrols2-universal-background.png
diff --git a/src/imports/controls/doc/images/qtquickcontrols2-universal-foreground.png b/src/imports/controls/doc/images/qtquickcontrols2-universal-foreground.png
new file mode 100644
index 00000000..e06b573b
--- /dev/null
+++ b/src/imports/controls/doc/images/qtquickcontrols2-universal-foreground.png
diff --git a/src/imports/controls/doc/images/qtquickcontrols2-universal-theme.png b/src/imports/controls/doc/images/qtquickcontrols2-universal-theme.png
new file mode 100644
index 00000000..f299b853
--- /dev/null
+++ b/src/imports/controls/doc/images/qtquickcontrols2-universal-theme.png
diff --git a/src/imports/controls/doc/snippets/qtquickcontrols2-universal-accent.qml b/src/imports/controls/doc/snippets/qtquickcontrols2-universal-accent.qml
new file mode 100644
index 00000000..afcfa87f
--- /dev/null
+++ b/src/imports/controls/doc/snippets/qtquickcontrols2-universal-accent.qml
@@ -0,0 +1,43 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:FDL$
+** 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 Free Documentation License Usage
+** Alternatively, this file may be used under the terms of the GNU Free
+** Documentation License version 1.3 as published by the Free Software
+** Foundation and appearing in the file included in the packaging of
+** this file. Please review the following information to ensure
+** the GNU Free Documentation License version 1.3 requirements
+** will be met: http://www.gnu.org/copyleft/fdl.html.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.0
+import QtQuick.Layouts 1.0
+import QtQuick.Controls 2.0
+import QtQuick.Controls.Universal 2.0
+
+Pane {
+    padding: 10
+
+//! [1]
+Button {
+    text: qsTr("Button")
+    highlighted: true
+    Universal.accent: Universal.Orange
+}
+//! [1]
+}
diff --git a/src/imports/controls/doc/snippets/qtquickcontrols2-universal-background.qml b/src/imports/controls/doc/snippets/qtquickcontrols2-universal-background.qml
new file mode 100644
index 00000000..32a1b43b
--- /dev/null
+++ b/src/imports/controls/doc/snippets/qtquickcontrols2-universal-background.qml
@@ -0,0 +1,44 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:FDL$
+** 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 Free Documentation License Usage
+** Alternatively, this file may be used under the terms of the GNU Free
+** Documentation License version 1.3 as published by the Free Software
+** Foundation and appearing in the file included in the packaging of
+** this file. Please review the following information to ensure
+** the GNU Free Documentation License version 1.3 requirements
+** will be met: http://www.gnu.org/copyleft/fdl.html.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.0
+import QtQuick.Controls 2.0
+import QtQuick.Controls.Universal 2.0
+
+Pane {
+    padding: 10
+
+//! [1]
+Pane {
+    Universal.background: Universal.Steel
+
+    Button {
+        text: qsTr("Button")
+    }
+}
+//! [1]
+}
diff --git a/src/imports/controls/doc/snippets/qtquickcontrols2-universal-foreground.qml b/src/imports/controls/doc/snippets/qtquickcontrols2-universal-foreground.qml
new file mode 100644
index 00000000..6ca35d74
--- /dev/null
+++ b/src/imports/controls/doc/snippets/qtquickcontrols2-universal-foreground.qml
@@ -0,0 +1,41 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:FDL$
+** 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 Free Documentation License Usage
+** Alternatively, this file may be used under the terms of the GNU Free
+** Documentation License version 1.3 as published by the Free Software
+** Foundation and appearing in the file included in the packaging of
+** this file. Please review the following information to ensure
+** the GNU Free Documentation License version 1.3 requirements
+** will be met: http://www.gnu.org/copyleft/fdl.html.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.0
+import QtQuick.Controls 2.0
+import QtQuick.Controls.Universal 2.0
+
+Pane {
+    padding: 10
+
+//! [1]
+Button {
+    text: qsTr("Button")
+    Universal.foreground: Universal.Pink
+}
+//! [1]
+}
diff --git a/src/imports/controls/doc/snippets/qtquickcontrols2-universal-theme.qml b/src/imports/controls/doc/snippets/qtquickcontrols2-universal-theme.qml
new file mode 100644
index 00000000..85e4a406
--- /dev/null
+++ b/src/imports/controls/doc/snippets/qtquickcontrols2-universal-theme.qml
@@ -0,0 +1,44 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:FDL$
+** 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 Free Documentation License Usage
+** Alternatively, this file may be used under the terms of the GNU Free
+** Documentation License version 1.3 as published by the Free Software
+** Foundation and appearing in the file included in the packaging of
+** this file. Please review the following information to ensure
+** the GNU Free Documentation License version 1.3 requirements
+** will be met: http://www.gnu.org/copyleft/fdl.html.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.0
+import QtQuick.Controls 2.0
+import QtQuick.Controls.Universal 2.0
+
+Pane {
+    padding: 10
+
+//! [1]
+Pane {
+    Universal.theme: Universal.Dark
+
+    Button {
+        text: qsTr("Button")
+    }
+}
+//! [1]
+}
diff --git a/src/imports/controls/doc/src/qtquickcontrols2-universal.qdoc b/src/imports/controls/doc/src/qtquickcontrols2-universal.qdoc
index 02dc93c9..b8f7789b 100644
--- a/src/imports/controls/doc/src/qtquickcontrols2-universal.qdoc
+++ b/src/imports/controls/doc/src/qtquickcontrols2-universal.qdoc
@@ -78,28 +78,6 @@
 
     \image qtquickcontrols2-universal-attributes.png
 
-    The following example illustrates how to create a red \e stop button with light text:
-
-    \table
-        \row
-            \li
-                \qml
-                import QtQuick 2.0
-                import QtQuick.Controls 2.0
-                import QtQuick.Controls.Universal 2.0
-
-                Button {
-                    text: "Stop"
-                    highlighted: true
-
-                    Universal.accent: Universal.Red
-                    Universal.theme: Universal.Dark
-                }
-                \endqml
-            \li
-                \image qtquickcontrols2-universal-button.png
-    \endtable
-
     Both attributes can be specified for any window or item, and they automatically
     propagate to children in the same manner as \l {Control::font}{fonts}. In the
     following example, the window and all three radio buttons appear in the dark
@@ -209,8 +187,21 @@
     This attached property holds the accent color of the theme. The property
     can be attached to any window or item. The value is propagated to children.
 
+    The default value is \c Universal.Cobalt.
+
+    In the following example, the accent color of the highlighted button is
+    changed to \c Universal.Orange:
+
+    \table
+        \row
+            \li
+                \snippet qtquickcontrols2-universal-accent.qml 1
+            \li
+                \image qtquickcontrols2-universal-accent.png
+    \endtable
+
     \note Even though the accent can be any \l {colorbasictypedocs}{color}, it is
-    recommended to use one of the  \l {pre-defined Universal colors} that have been
+    recommended to use one of the \l {pre-defined Universal colors} that have been
     designed to work well with the rest of the Universal style palette.
 
     \endstyleproperty
@@ -222,6 +213,17 @@
 
     The default value is theme-specific (light or dark).
 
+    In the following example, the background color of the pane is changed to
+    \c Universal.Steel:
+
+    \table
+        \row
+            \li
+                \snippet qtquickcontrols2-universal-background.qml 1
+            \li
+                \image qtquickcontrols2-universal-background.png
+    \endtable
+
     \endstyleproperty
 
     \styleproperty {Universal.foreground} {color} {universal-foreground-attached-prop}
@@ -231,6 +233,17 @@
 
     The default value is theme-specific (light or dark).
 
+    In the following example, the foreground color of the button is set to \c
+    Universal.Pink:
+
+    \table
+        \row
+            \li
+                \snippet qtquickcontrols2-universal-foreground.qml 1
+            \li
+                \image qtquickcontrols2-universal-foreground.png
+    \endtable
+
     \styleproperty {Universal.theme} {enumeration} {universal-theme-attached-prop}
     \target universal-theme-attached-prop
     This attached property holds whether the theme is light or dark. The property
@@ -240,6 +253,17 @@
     \value Universal.Light Light theme (default)
     \value Universal.Dark Dark theme
 
+    In the following example, the theme for both the pane and the button is set
+    to \c Universal.Dark:
+
+    \table
+        \row
+            \li
+                \snippet qtquickcontrols2-universal-theme.qml 1
+            \li
+                \image qtquickcontrols2-universal-theme.png
+    \endtable
+
     \endstyleproperty
 
     \section1 Attached Method Documentation
@@ -250,9 +274,6 @@
     \l {pre-defined Universal colors}{pre-defined Universal color}.
 
     \qml
-    import QtQuick 2.0
-    import QtQuick.Controls.Universal 2.0
-
     Rectangle {
         color: Universal.color(Universal.Red)
     }