QRect(F): add transposed()

I didn't add a transpose(), because r = r.transposed() is
perfectly capable of filling that role, and just as
efficient. Existing API mistakes are no excuse to create
more of them.

[ChangeLog][QtCore][QRect/QRectF] Added transposed().

Change-Id: Ic38721e9028496fc9b50f4d4cef2e7a60532eed8
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>

src/corelib/tools/qrect.cpp

@@ -706,6 +706,20 @@ QRect QRect::normalized() const Q_DECL_NOTHROW
     current position.
 */
 
+/*!
+    \fn QRect QRect::transposed() const
+    \since 5.7
+
+    Returns a copy of the rectangle that has its width and height
+    exchanged:
+
+    \code
+    QRect r = {15, 51, 42, 24};
+    r = r.transposed(); // r == {15, 51, 24, 42}
+    \endcode
+
+    \sa QSize::transposed()
+*/
 
 /*!
     \fn void QRect::setRect(int x, int y, int width, int height)
@@ -1842,6 +1856,20 @@ QRectF QRectF::normalized() const Q_DECL_NOTHROW
     current position.
 */
 
+/*!
+    \fn QRectF QRectF::transposed() const
+    \since 5.7
+
+    Returns a copy of the rectangle that has its width and height
+    exchanged:
+
+    \code
+    QRectF r = {1.5, 5.1, 4.2, 2.4};
+    r = r.transposed(); // r == {1.5, 5.1, 2.4, 4.2}
+    \endcode
+
+    \sa QSizeF::transposed()
+*/
 
 /*!
     \fn void QRectF::setRect(qreal x, qreal y, qreal width, qreal height)

src/corelib/tools/qrect.h

@@ -102,6 +102,7 @@ public:
     Q_DECL_RELAXED_CONSTEXPR inline void translate(const QPoint &p) Q_DECL_NOTHROW;
     Q_DECL_CONSTEXPR inline QRect translated(int dx, int dy) const Q_DECL_NOTHROW Q_REQUIRED_RESULT;
     Q_DECL_CONSTEXPR inline QRect translated(const QPoint &p) const Q_DECL_NOTHROW Q_REQUIRED_RESULT;
+    Q_DECL_CONSTEXPR inline QRect transposed() const Q_DECL_NOTHROW Q_REQUIRED_RESULT;
 
     Q_DECL_RELAXED_CONSTEXPR inline void moveTo(int x, int t) Q_DECL_NOTHROW;
     Q_DECL_RELAXED_CONSTEXPR inline void moveTo(const QPoint &p) Q_DECL_NOTHROW;
@@ -284,6 +285,9 @@ Q_DECL_CONSTEXPR inline QRect QRect::translated(int dx, int dy) const Q_DECL_NOT
 Q_DECL_CONSTEXPR inline QRect QRect::translated(const QPoint &p) const Q_DECL_NOTHROW
 { return QRect(QPoint(x1 + p.x(), y1 + p.y()), QPoint(x2 + p.x(), y2 + p.y())); }
 
+Q_DECL_CONSTEXPR inline QRect QRect::transposed() const Q_DECL_NOTHROW
+{ return QRect(topLeft(), size().transposed()); }
+
 Q_DECL_RELAXED_CONSTEXPR inline void QRect::moveTo(int ax, int ay) Q_DECL_NOTHROW
 {
     x2 += ax - x1;
@@ -551,6 +555,8 @@ public:
     Q_DECL_CONSTEXPR inline QRectF translated(qreal dx, qreal dy) const Q_DECL_NOTHROW Q_REQUIRED_RESULT;
     Q_DECL_CONSTEXPR inline QRectF translated(const QPointF &p) const Q_DECL_NOTHROW Q_REQUIRED_RESULT;
 
+    Q_DECL_CONSTEXPR inline QRectF transposed() const Q_DECL_NOTHROW Q_REQUIRED_RESULT;
+
     Q_DECL_RELAXED_CONSTEXPR inline void moveTo(qreal x, qreal y) Q_DECL_NOTHROW;
     Q_DECL_RELAXED_CONSTEXPR inline void moveTo(const QPointF &p) Q_DECL_NOTHROW;
 
@@ -751,6 +757,9 @@ Q_DECL_CONSTEXPR inline QRectF QRectF::translated(qreal dx, qreal dy) const Q_DE
 Q_DECL_CONSTEXPR inline QRectF QRectF::translated(const QPointF &p) const Q_DECL_NOTHROW
 { return QRectF(xp + p.x(), yp + p.y(), w, h); }
 
+Q_DECL_CONSTEXPR inline QRectF QRectF::transposed() const Q_DECL_NOTHROW
+{ return QRectF(topLeft(), size().transposed()); }
+
 Q_DECL_RELAXED_CONSTEXPR inline void QRectF::getRect(qreal *ax, qreal *ay, qreal *aaw, qreal *aah) const
 {
     *ax = this->xp;

tests/auto/corelib/tools/qrect/tst_qrect.cpp

@@ -127,6 +127,9 @@ private slots:
     void translate_data();
     void translate();
 
+    void transposed_data();
+    void transposed();
+
     void moveTop();
     void moveBottom();
     void moveLeft();
@@ -3562,6 +3565,41 @@ void tst_QRect::translate()
 
 }
 
+void tst_QRect::transposed_data()
+{
+    QTest::addColumn<QRect>("r");
+
+    QTest::newRow("InvalidQRect") << getQRectCase(InvalidQRect);
+    QTest::newRow("SmallestQRect") << getQRectCase(SmallestQRect);
+    QTest::newRow("MiddleQRect") << getQRectCase(MiddleQRect);
+    QTest::newRow("LargestQRect") << getQRectCase(LargestQRect);
+    QTest::newRow("SmallestCoordQRect") << getQRectCase(SmallestCoordQRect);
+    QTest::newRow("LargestCoordQRect") << getQRectCase(LargestCoordQRect);
+    QTest::newRow("RandomQRect") << getQRectCase(RandomQRect);
+    QTest::newRow("NegativeSizeQRect") << getQRectCase(NegativeSizeQRect);
+    QTest::newRow("NegativePointQRect") << getQRectCase(NegativePointQRect);
+    QTest::newRow("NullQRect") << getQRectCase(NullQRect);
+    QTest::newRow("EmptyQRect") << getQRectCase(EmptyQRect);
+}
+
+void tst_QRect::transposed()
+{
+    QFETCH(QRect, r);
+
+    const QRect rt = r.transposed();
+    QCOMPARE(rt.height(), r.width());
+    QCOMPARE(rt.width(), r.height());
+    QCOMPARE(rt.topLeft(), r.topLeft());
+
+    const QRectF rf = r;
+
+    const QRectF rtf = rf.transposed();
+    QCOMPARE(rtf.height(), rf.width());
+    QCOMPARE(rtf.width(), rf.height());
+    QCOMPARE(rtf.topLeft(), rf.topLeft());
+
+    QCOMPARE(rtf, QRectF(rt));
+}
 
 void tst_QRect::moveTop()
 {