Add operators and implicit sharing to QStaticText

Adds copy constructor, operator==, operator= and operator!= to
QStaticText. Implemented using an implicitly shared private object.

3 files changed, 91 insertions, 26 deletions

diff --git a/src/gui/text/qstatictext.cpp b/src/gui/text/qstatictext.cpp
index d665abe..b6c123b 100644
--- a/src/gui/text/qstatictext.cpp
+++ b/src/gui/text/qstatictext.cpp
@@ -112,14 +112,21 @@ QStaticText::QStaticText()
 */
 QStaticText::QStaticText(const QString &text, const QFont &font, const QSizeF &sz)
     : d_ptr(new QStaticTextPrivate) 
-{
-    Q_D(QStaticText);
-    
-    d->textLayout->setText(text);
-    d->textLayout->setFont(font);
-    d->size = sz;
+{    
+    d_ptr->textLayout->setText(text);
+    d_ptr->textLayout->setFont(font);
+    d_ptr->size = sz;
 
-    d->init();
+    d_ptr->init();
+}
+
+/*!
+    Constructs a QStaticText object which is a copy of \a other.
+*/
+QStaticText::QStaticText(const QStaticText &other)    
+{
+    d_ptr = other.d_ptr;
+    d_ptr->ref.ref();
 }
 
 /*!
@@ -127,8 +134,47 @@ QStaticText::QStaticText(const QString &text, const QFont &font, const QSizeF &s
 */
 QStaticText::~QStaticText()
 {
-    Q_D(QStaticText);
-    delete d;
+    if (!d_ptr->ref.deref())
+        delete d_ptr;        
+}
+
+/*!
+    \internal
+*/
+void QStaticText::detach()
+{
+    if (d_ptr->ref != 1)
+        qAtomicDetach(d_ptr);    
+}
+
+/*!
+    Assigns \a other to this QStaticText.
+*/
+QStaticText &QStaticText::operator=(const QStaticText &other)
+{
+    qAtomicAssign(d_ptr, other.d_ptr);
+    return *this;
+}
+
+/*!
+    Compares \a other to this QStaticText. Returns true if the texts, fonts and maximum sizes
+    are equal.
+*/
+bool QStaticText::operator==(const QStaticText &other) const
+{
+    return (d_ptr == other.d_ptr
+        || (d_ptr->textLayout->text() == other.d_ptr->textLayout->text()
+            && d_ptr->textLayout->font() == other.d_ptr->textLayout->font()
+            && d_ptr->size == other.d_ptr->size));
+}
+
+/*!
+    Compares \a other to this QStaticText. Returns true if the texts, fonts or maximum sizes
+    are different.
+*/
+bool QStaticText::operator!=(const QStaticText &other) const
+{
+    return !(*this == other);
 }
 
 /*!
@@ -140,9 +186,10 @@ QStaticText::~QStaticText()
 */
 void QStaticText::setText(const QString &text) 
 {
-    Q_D(QStaticText);
-    d->textLayout->setText(text);
-    d->init();
+    detach();
+
+    d_ptr->textLayout->setText(text);
+    d_ptr->init();
 }
 
 /*!
@@ -152,8 +199,7 @@ void QStaticText::setText(const QString &text)
 */
 QString QStaticText::text() const 
 {
-    Q_D(const QStaticText);
-    return d->textLayout->text();
+    return d_ptr->textLayout->text();
 }
 
 /*!
@@ -165,9 +211,10 @@ QString QStaticText::text() const
 */
 void QStaticText::setFont(const QFont &font)
 {
-    Q_D(QStaticText);
-    d->textLayout->setFont(font);
-    d->init();
+    detach();
+
+    d_ptr->textLayout->setFont(font);
+    d_ptr->init();
 }
 
 /*!
@@ -177,8 +224,7 @@ void QStaticText::setFont(const QFont &font)
 */
 QFont QStaticText::font() const
 {
-    Q_D(const QStaticText);
-    return d->textLayout->font();
+    return d_ptr->textLayout->font();
 }
 
 /*!
@@ -191,9 +237,10 @@ QFont QStaticText::font() const
 */
 void QStaticText::setMaximumSize(const QSizeF &maximumSize)
 {
-    Q_D(QStaticText);
-    d->size = maximumSize;
-    d->init();
+    detach();
+
+    d_ptr->size = maximumSize;
+    d_ptr->init();
 }
 
 /*!
@@ -203,8 +250,12 @@ void QStaticText::setMaximumSize(const QSizeF &maximumSize)
 */
 QSizeF QStaticText::maximumSize() const
 {
-    Q_D(const QStaticText);
-    return d->size;
+    return d_ptr->size;
+}
+
+QString QStaticText::toString() const
+{
+    return text();
 }
 
 QStaticTextPrivate::QStaticTextPrivate()
@@ -212,6 +263,12 @@ QStaticTextPrivate::QStaticTextPrivate()
 {
 }
 
+QStaticTextPrivate::QStaticTextPrivate(const QStaticTextPrivate &other)    
+{
+    textLayout = new QTextLayout(other.textLayout->text(), other.textLayout->font());
+    size = other.size;    
+}
+
 QStaticTextPrivate::~QStaticTextPrivate()
 {
     delete textLayout;
diff --git a/src/gui/text/qstatictext.h b/src/gui/text/qstatictext.h
index a25bef8..4976039 100644
--- a/src/gui/text/qstatictext.h
+++ b/src/gui/text/qstatictext.h
@@ -58,10 +58,9 @@ class Q_GUI_EXPORT QStaticText
 public:
     QStaticText();
     QStaticText(const QString &text, const QFont &font = QFont(), const QSizeF &maximumSize = QSizeF());
+    QStaticText(const QStaticText &other);
     ~QStaticText();
 
-    void isValid() const;
-
     void setText(const QString &text);
     QString text() const;
 
@@ -71,8 +70,15 @@ public:
     void setMaximumSize(const QSizeF &maximumSize);
     QSizeF maximumSize() const;
 
+    QStaticText &operator=(const QStaticText &);
+    bool operator==(const QStaticText &) const;
+    bool operator!=(const QStaticText &) const;
+
+    QString toString() const;
 
 private:
+    void detach();
+
     QStaticTextPrivate *d_ptr;
 };
 
diff --git a/src/gui/text/qstatictext_p.h b/src/gui/text/qstatictext_p.h
index 1e334d7..773971a 100644
--- a/src/gui/text/qstatictext_p.h
+++ b/src/gui/text/qstatictext_p.h
@@ -62,12 +62,14 @@ class QStaticTextPrivate
 {
 public:
     QStaticTextPrivate();
+    QStaticTextPrivate(const QStaticTextPrivate &other);
     ~QStaticTextPrivate();
 
     void init();
 
     QTextLayout *textLayout;
     QSizeF size;
+    QAtomicInt ref;
     
     static QStaticTextPrivate *get(const QStaticText *q);
 };