Make QMargins a proper class

Since we need QMargins for other things then
the CSS helper functions in drawutil, we have to make it more
generic. It is already useful for QWidget::contentsMargins
for example. This ensures we have some flexibility on how to
use and modify it in the future.

Reviewed-by: mbm

1 files changed, 152 insertions, 0 deletions

diff --git a/src/corelib/tools/qmargins.h b/src/corelib/tools/qmargins.h
new file mode 100644
index 0000000..de5ce0d
--- /dev/null
+++ b/src/corelib/tools/qmargins.h
@@ -0,0 +1,152 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://qt.nokia.com/contact.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QMARGINS_H
+#define QMARGINS_H
+
+#include <QtCore/qnamespace.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Core)
+
+class Q_CORE_EXPORT QMargins
+{
+public:
+    QMargins();
+    QMargins(int left, int top, int right, int bottom);
+
+    bool isNull() const;
+
+    int left() const;
+    int top() const;
+    int right() const;
+    int bottom() const;
+
+    void setLeft(int left);
+    void setTop(int top);
+    void setRight(int right);
+    void setBottom(int bottom);
+
+    int &rleft();
+    int &rtop();
+    int &rright();
+    int &rbottom();
+
+private:
+    int m_left;
+    int m_top;
+    int m_right;
+    int m_bottom;
+
+    friend inline bool operator==(const QMargins &, const QMargins &);
+    friend inline bool operator!=(const QMargins &, const QMargins &);
+};
+
+Q_DECLARE_TYPEINFO(QMargins, Q_MOVABLE_TYPE);
+
+/*****************************************************************************
+  QMargins inline functions
+ *****************************************************************************/
+
+inline QMargins::QMargins()
+{ m_top = m_bottom = m_left = m_right = 0; }
+
+inline QMargins::QMargins(int left, int top, int right, int bottom)
+{ m_left = left; m_top = top; m_right = right; m_bottom = bottom; }
+
+inline bool QMargins::isNull() const
+{ return m_left==0 && m_top==0 && m_right==0 && m_bottom==0; }
+
+inline int QMargins::left() const
+{ return m_left; }
+
+inline int QMargins::top() const
+{ return m_top; }
+
+inline int QMargins::right() const
+{ return m_right; }
+
+inline int QMargins::bottom() const
+{ return m_bottom; }
+
+
+inline void QMargins::setLeft(int left)
+{ m_left = left; }
+
+inline void QMargins::setTop(int top)
+{ m_top = top; }
+
+inline void QMargins::setRight(int right)
+{ m_right = right; }
+
+inline void QMargins::setBottom(int bottom)
+{ m_bottom = bottom; }
+
+inline bool operator==(const QMargins &m1, const QMargins &m2)
+{
+    return
+            m1.m_left == m2.m_left &&
+            m1.m_top == m2.m_top &&
+            m1.m_right == m2.m_right &&
+            m1.m_bottom == m2.m_bottom;
+}
+
+inline bool operator!=(const QMargins &m1, const QMargins &m2)
+{
+    return
+            m1.m_left != m2.m_left ||
+            m1.m_top != m2.m_top ||
+            m1.m_right != m2.m_right ||
+            m1.m_bottom != m2.m_bottom;
+}
+
+#ifndef QT_NO_DEBUG_STREAM
+Q_CORE_EXPORT QDebug operator<<(QDebug, const QMargins &);
+#endif
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QMARGINS_H