Part III: Designing Interaction Details in Java

Integrating qrcode in Java Part III: Designing Interaction Details
Part III: Designing Interaction Details
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where dragging and dropping text involves first a click-and-drag operation to make the selection, then another mouse move back into the selection to click and drag again for the actual move. To do the same thing, Excel makes you find a special pliant zone (only a pixel or two wide) on the border of the selected cell. To move a discrete selection, the user must click and drag on the object in a single motion. To relieve the click-and-drag burden of selection in word processors, other direct manipulation shortcuts are also implemented, like double-clicking to select a word.
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Selected objects must be clearly, boldly indicated as such to users. The selected state must be easy to spot on a crowded screen, must be unambiguous, and must not obscure normally visible details of the object.
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The selection state should be visually evident and unambiguous.
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You must ensure that, in particular, users can easily tell which items are selected and which are not. It s not good enough just to be able to see that the items are different. Keep in mind that a significant portion of the population is color-blind, so color alone is insufficient to distinguish between selections. Historically, inversion has been used to indicate selection (e.g., making the white pixels black and black pixels white). Although this is visually bold, it is not necessarily very readable, especially when it comes to full-color interfaces. Other approaches include colored backgrounds, outlines, pseudo-3D depression, handles, and animated marquees. In drawing, painting, animation, and presentation programs, where users deal with visually rich objects, it s easy for selections to get lost. The best solution here is to add selection indicators to the object, rather than merely indicating selection by changing any of the selected object s visual properties. Most drawing programs take this approach, with handles: little boxes that surround the selected object, providing points of control. With irregularly shaped selections (such as those in a image-manipulation program like Adobe Photoshop), handles can be confusing and get lost in the clutter. There is, however, one way to ensure that the selection will always be visible, regardless of the colors used: Indicate the selection by movement. One of the first programs on the Macintosh, MacPaint, had a wonderful idiom where a selected object was outlined with a simple dashed line, except that the
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19: Pointing, Selecting, and Direct Manipulation
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dashes all moved in synchrony around the object. The dashes looked like ants in a column; thus, this effect earned the colorful sobriquet marching ants. Today, this is commonly called a marquee, after the flashing lights on old cinema signs that exhibited a similar behavior. Adobe PhotoShop uses this idiom to show selected regions of photographs, and it works extremely well (expert users can toggle it off and on with a keystroke so that they can see their work without visual distraction). The animation is not hard to do, although it takes some care to get it right, and it works regardless of the color mix and intensity of the background.
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Of all the direct-manipulation idioms, nothing defines the GUI more than the drag-and-drop operation: clicking and holding the button while moving some object across the screen and releasing in a meaningful location. Surprisingly, dragand-drop isn t used as widely as we d like to think, and it certainly hasn t lived up to its full potential. In particular, the popularity of the Web and the myth that Web-like behavior is synonymous with superior ease of use have set back the development of drag-anddrop on the desktop, as developers mistakenly emulated the crippled interactions of Web browsers in other, far less appropriate contexts. Luckily, as Web technology has been refined, programmers have been able to provide rich drag-and-drop behavior in the browser, and while this is still somewhat challenging, it seems that there is a resurgence in rich, expressive command idioms for all platforms. We might define drag-and-drop as clicking on an object and moving it to a new location, although that definition is somewhat narrow in scope for such a broad idiom. A more accurate description of drag-and-drop is clicking on some object and moving it to imply a transformation. The Macintosh was the first successful system to offer drag-and-drop. It raised a lot of expectations with the idiom that were never fully realized for two simple reasons. First, drag-and-drop wasn t a systemwide facility, but rather an artifact of the Finder, a single program. Second, as the Mac was at the time a single-tasking computer, the concept of drag-and-drop between applications didn t surface as an issue for many years. To Apple s credit, they described drag-and-drop in their first user-interface standards guide. On the other side of the fence, Microsoft not only failed to put drag-and-drop aids in its early releases of Windows but didn t even describe the
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