Qt color define

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本文介绍了Qt中预定义的颜色及其使用方式，包括20种由Qt::GlobalColor枚举描述的颜色，如黑色、白色及不同深浅的灰色等。此外还详细解释了Qt::color0、Qt::color1和Qt::transparent三种颜色的特殊用途。

Predefined Colors

There are 20 predefined QColors described by the Qt::GlobalColor enum, including black, white, primary and secondary colors, darker versions of these colors and three shades of gray. QColor also recognizes a variety of color names; the static colorNames () function returns a QStringList color names that QColor knows about.

Additionally, the Qt::color0, Qt::color1 and Qt::transparent colors are used for special purposes.

Qt::color0 (zero pixel value) and Qt::color1 (non-zero pixel value) are special colors for drawing in QBitmaps. Painting with Qt::color0 sets the bitmap bits to 0 (transparent; i.e., background), and painting with Qt::color1 sets the bits to 1 (opaque; i.e., foreground).

Qt::transparent is used to indicate a transparent pixel. When painting with this value, a pixel value will be used that is appropriate for the underlying pixel format in use.