I think we need to do a full audit on the sizes of all our 'clickable' elements in Seven and then define a minimum height and width.
In the iPhone Human Interface Guidelines, Apple recommends a minimum target size of 44 pixels wide 44 pixels tall. Since physical pixel size can vary by screen density, Apple's pixel specifications apply best to the iPhone's 320 by 480 pixel, 3.5 inch display (164ppi). Since the release of the iPhone 4's Retina Display (326ppi) Apple has updated these specs to points instead of pixels.
In the Windows Phone UI Design and Interaction Guide (PDF), Microsoft goes further and suggests: a recommended touch target size of 9mm/34px; a minimum touch target size of 7mm/26px; a minimum spacing between elements of 2mm/8px; and the visual size of a UI control to be 60-100% of the touch target size.
They also suggest touch targets can be larger than 9mm if: the UI element is frequently touched; the result of a touch error is severe or really frustrating; the UI element is located toward edge of the screen or difficult to hit; or when the UI element is part of a sequential task –like using the dial pad.
Nokia's developer resources suggest that touchable interface elements should not be smaller than the smallest average finger pad, that is, no smaller than 1 cm (0.4") in diameter or a 1 cm × 1 cm square. Minimum target sizes for a finger usable UI element are:
- 7 x 7 mm with 1 mm gaps for index finger usage
- 8 x 8 mm with 2 mm gaps for thumb usage
- List type of components should have minimum of 5 mm line spacing
- The width of a finger limits the density of items on screen. If the items are too close, the user will not be able to choose a single one.
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