Add QProxyStyle(QString key) constructor for convenience

The QStyle implementations are becoming private, so the following
slightly verbose pattern seems to be now repeated a lot:

    new QProxyStyle(QStyleFactory::create("windows"))

This change adds an alternative, more convenient constructor for
this particular use case:

    new QProxyStyle("windows")

Change-Id: I97ded597a0fd3225a6354ebea0abb367237430af
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>

1 files changed, 23 insertions, 4 deletions

diff --git a/src/widgets/styles/qproxystyle.cpp b/src/widgets/styles/qproxystyle.cpp
index 66ace0f60b..911223cae2 100644
--- a/src/widgets/styles/qproxystyle.cpp
+++ b/src/widgets/styles/qproxystyle.cpp
@@ -108,10 +108,9 @@ void QProxyStylePrivate::ensureBaseStyle() const
 }
 
 /*!
-  Constructs a QProxyStyle object for overriding behavior in \a style
-  or in the current application \l{QStyle}{style} if \a style is 0
-  (default). Normally \a style is 0, because you want to override
-  behavior in the system style.
+  Constructs a QProxyStyle object for overriding behavior in the
+  specified base \a style, or in the current \l{QApplication::style}
+  {application style} if base \a style is not specified.
 
   Ownership of \a style is transferred to QProxyStyle.
 */
@@ -127,6 +126,26 @@ QProxyStyle::QProxyStyle(QStyle *style) :
 }
 
 /*!
+    Constructs a QProxyStyle object for overriding behavior in
+    the base style specified by style \a key, or in the current
+    \l{QApplication::style}{application style} if the specified
+    style \a key is unrecognized.
+
+    \sa QStyleFactory::create()
+*/
+QProxyStyle::QProxyStyle(const QString &key) :
+    QCommonStyle(*new QProxyStylePrivate())
+{
+    Q_D(QProxyStyle);
+    QStyle *style = QStyleFactory::create(key);
+    if (style) {
+        d->baseStyle = style;
+        style->setProxy(this);
+        style->setParent(this); // Take ownership
+    }
+}
+
+/*!
     Destroys the QProxyStyle object.
 */
 QProxyStyle::~QProxyStyle()