A high contrast mode supports people with low vision. On Microsoft® Windows®
systems, high contrast mode is available from the Control Panel;
in the Ease of Access Center in Windows 7 and equivalent facilities
in other versions of Windows.
In JViews Diagrammer,
the recommended way to support high contrast mode is to design a
special cascading style sheet (CSS) for this mode. You can use the
cascading feature to combine different CSS files.
An application might have a style sheet for everything except
colors and fonts, a style sheet defining the colors and fonts for
normal mode, and a different style sheet defining brighter colors
and larger fonts for high contrast mode. The choice of style sheet
can be implemented by checking IlvSwingUtil.isHighContrastMode.
if (IlvSwingUtil.isHighContrastMode()) {
diagrammer.addStyleSheet(new URL("file:highContrastStyleSheet.css"));
} else {
diagrammer.addStyleSheet(new URL("file:normalStyleSheet.css"));
}
Instead of using two different style files, you can also specify a
high contrast and a normal contrast theme in the same style file,
by using the CSS pseudo-classes
high-contrast
and
normal-contrast
. The following code example shows this kind of CSS file:
node {
... here are all settings that apply to normal and high contrast ...
}
node:normal-contrast {
... here are color and font settings that apply to normal contrast ...
}
node:high-contrast {
... here are brighter color and larger font settings that apply to high contrast ...
}
The SDM engine is initialized with the
contrast theme detected from the operating system. To change the
initial setting, you can call in Java:
sdmEngine.setContrastAccessibilityTheme(IlvSDMEngine.HIGH_CONTRAST);