QSize Class Reference
[QtCore module]

Detailed Description

The QSize class defines the size of a two-dimensional object using integer point precision.

A size is specified by a width() and a height(). It can be set in the constructor and changed using the setWidth(), setHeight(), or scale() functions, or using arithmetic operators. A size can also be manipulated directly by retrieving references to the width and height using the rwidth() and rheight() functions. Finally, the width and height can be swapped using the transpose() function.

The isValid() function determines if a size is valid (a valid size has both width and height greater than zero). The isEmpty() function returns true if either of the width and height is less than, or equal to, zero, while the isNull() function returns true only if both the width and the height is zero.

Use the expandedTo() function to retrieve a size which holds the maximum height and width of this size and a given size. Similarly, the boundedTo() function returns a size which holds the minimum height and width of this size and a given size.

QSize objects can be streamed as well as compared.

See also QSizeF, QPoint, and QRect.

Member Function Documentation

 QSize size(100, 10);
 size.rheight() += 5;

 // size becomes (100,15)

 QSize size(100, 10);
 size.rwidth() += 20;

 // size becomes (120,10)

 QSize t1(10, 12);
 t1.scale(60, 60, Qt::IgnoreAspectRatio);
 // t1 is (60, 60)

 QSize t2(10, 12);
 t2.scale(60, 60, Qt::KeepAspectRatio);
 // t2 is (50, 60)

 QSize t3(10, 12);
 t3.scale(60, 60, Qt::KeepAspectRatioByExpanding);
 // t3 is (60, 72)

 QSize s( 3, 7);
 QSize r(-1, 4);
 s += r;

 // s becomes (2,11)

 QSize s( 3, 7);
 QSize r(-1, 4);
 s -= r;

 // s becomes (4,3)