Long live QColorConstants!

QColorConstant is a C++11 version of Qt::GlobalColor, except that instead
of Qt::red being an enum, QColorConstants::red is an actual QColor instance,
a bit like in the Qt 3 days.

In addition, the SVG names that QColor understands are also available,
with the same values. Technically, when building a QColor from a color
name, QColor ignores casing and whitespaces; we stick to the SVG/CSS
official color names (which are lowercase), and prefix them with Svg
to clarify where they come from. For instance, note how SVG's gray
is not Qt::gray.

[ChangeLog][QtGui][[QColor] Added QColorConstants, a namespace
containing constexpr QColor instances.

Change-Id: Ic9fab26a9a537fcc43cc230da28f4c6314a32438
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

1 files changed, 86 insertions, 0 deletions

diff --git a/src/gui/doc/src/includes/qt-colors.qdocinc b/src/gui/doc/src/includes/qt-colors.qdocinc
new file mode 100644
index 0000000000..4c082323b6
--- /dev/null
+++ b/src/gui/doc/src/includes/qt-colors.qdocinc
@@ -0,0 +1,86 @@
+\table
+\header
+    \li Name
+    \li Hex
+    \li Color
+\row
+    \li Color0
+    \li #000000
+    \li \svgcolor {#000000}
+\row
+    \li Color1
+    \li #ffffff
+    \li \svgcolor {#ffffff}
+\row
+    \li Black
+    \li #000000
+    \li \svgcolor {#000000}
+\row
+    \li White
+    \li #ffffff
+    \li \svgcolor {#ffffff}
+\row
+    \li DarkGray
+    \li #808080
+    \li \svgcolor {#808080}
+\row
+    \li Gray
+    \li #a0a0a4
+    \li \svgcolor {#a0a0a4}
+\row
+    \li LightGray
+    \li #c0c0c0
+    \li \svgcolor {#c0c0c0}
+\row
+    \li Red
+    \li #ff0000
+    \li \svgcolor {#ff0000}
+\row
+    \li Green
+    \li #00ff00
+    \li \svgcolor {#00ff00}
+\row
+    \li Blue
+    \li #0000ff
+    \li \svgcolor {#0000ff}
+\row
+    \li Cyan
+    \li #00ffff
+    \li \svgcolor {#00ffff}
+\row
+    \li Magenta
+    \li #ff00ff
+    \li \svgcolor {#ff00ff}
+\row
+    \li Yellow
+    \li #ffff00
+    \li \svgcolor {#ffff00}
+\row
+    \li DarkRed
+    \li #800000
+    \li \svgcolor {#800000}
+\row
+    \li DarkGreen
+    \li #008000
+    \li \svgcolor {#008000}
+\row
+    \li DarkBlue
+    \li #000080
+    \li \svgcolor {#000080}
+\row
+    \li DarkCyan
+    \li #008080
+    \li \svgcolor {#008080}
+\row
+    \li DarkMagenta
+    \li #800080
+    \li \svgcolor {#800080}
+\row
+    \li DarkYellow
+    \li #808000
+    \li \svgcolor {#808000}
+\row
+    \li Transparent
+    \li #00000000
+    \li (transparent)
+\endtable