Projects/Usability/HIG/Toggle Buttons

From KDE TechBase
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A toggle button is a button which stays down when clicked once and goes up when clicked a second time.

When to use

Use a toggle button to indicate a state. For example a word-processor would use toggle buttons to indicate the state of "Bold", "Italic" or "Underline" formatting.

Do and don't

Do not change the icon or label of a toggle button. The fact that it is pressed down is enough.

Since a toggle button represents a state, in most cases the label should be a noun rather than a verb.