By Adam Satariano, Bloomberg

Diana Dawson has over the years bought her twin children digital cameras, e-book readers and media players as Christmas presents. This holiday season, she’s covering those bases with one device: a tablet computer.

“They do it all,” Dawson said outside an Apple Inc. store in Walnut Creek after buying iPads for her now 27-year-old daughters.

Dawson’s purchasing underscores the changes roiling the consumer-electronics market. While the industry once benefited from year-end sales in categories from cameras to printers to desktop personal computers, this holiday period brings the clearest signs yet that shoppers are focusing on fewer gadgets. Tablets and smartphones are now the Swiss Army knives of technology, tackling an array of tasks once performed by multiple gizmos.

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