Part III: Designing Interaction Details in Java

Development QR-Code in Java Part III: Designing Interaction Details
Part III: Designing Interaction Details
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extended. Again, meta-keys should be used. In Word, the Shift key causes everything between the initial selection and the Shift+click to be selected. Some list boxes, as well as the file views in Windows (both examples of discrete data), do something a bit strange with additive selection. They use the Ctrl key to implement normal discrete additive selection, but then they use the Shift key to extend the selection, as if it were contiguous, not discrete data. In most cases this mapping adds confusion, because it conflicts with the common idiom for discrete additive selection.
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The click-and-drag operation is also the basis for group selection. For contiguous data, it means extend the selection from the mouse-down point to the mouse-up point. This can also be modified with meta-keys. In Word, for example, Ctrl+click selects a complete sentence, so a Ctrl+drag extends the selection sentence by sentence. Sovereign applications should rightly enrich their interaction with these sorts of variants as appropriate. Experienced users will eventually come to memorize and use them, as long as the variants are manually simple. In a collection of discrete objects, the click-and-drag operation generally begins a drag-and-drop move. If the mouse button is clicked in an area between objects, rather than on any specific object, it has a special meaning. It creates a drag rectangle, shown in Figure 19-5. A drag rectangle is a dynamically sizable rectangle whose upper-left corner is the mouse-down point and whose lower-right corner is the mouse-up point. When the mouse button is released, any and all objects enclosed within the drag rectangle are selected as a group.
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Figure 19-5 When the cursor is not on any particular object at mouse-down time, the click-and-drag operation normally creates a drag rectangle that selects any object wholly enclosed by it when the mouse button is released. This is a familiar idiom to users of drawing programs and many word processors. This example is taken from Windows Explorer. The rectangle has been dragged from the upper left to the lower right.
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19: Pointing, Selecting, and Direct Manipulation
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As we ve established, selection indicates on which object subsequent actions will operate. If that action involves creating or pasting new data or objects (via keystrokes or a PASTE command), they are somehow added to the selected object. In discrete selection, one or more discrete objects are selected, and the incoming data is handed to the selected discrete objects, which process the data in their own ways. This may cause a replacement action, where the incoming data replaces the selected object. Alternatively, the selected object may treat the incoming data in some predetermined way. In PowerPoint, for example, when a shape is selected, incoming keystrokes result in a text annotation of the selected shape. In contiguous selection, however, the incoming data always replaces the currently selected data. When you type in a word processor or text-entry box, you replace what is selected with what you are typing. Contiguous selection exhibits a unique quirk: The selection can simply indicate a location between two elements of contiguous data, rather than any particular element of the data. This in-between place is called the insertion point. In a word processor, the caret (usually a blinking vertical line that indicates where the next character will go) indicates a position between two characters in the text, without actually selecting either one of them. By pointing and clicking anywhere else, you can easily move the caret, but if you drag to extend the selection, the caret disappears and is replaced by the contiguous selection of text. Spreadsheets also use contiguous selection but implement it somewhat differently than word processors do. The selection is contiguous because the cells form a contiguous matrix of data, but there is no concept of selecting the space between two cells. In the spreadsheet, a single-click will select exactly one whole cell. There is currently no concept of an insertion point in a spreadsheet, although the design possibilities are intriguing (that is, select the line between the top and bottom of two vertically adjacent cells and start typing to insert a row and fill a new cell in a single action). A blend of these two idioms is possible as well. In PowerPoint s slide-sorter view, insertion-point selection is allowed, but single slides can be selected, too. If you click on a slide, that slide is selected, but if you click in between two slides, a blinking insertion-point caret is placed there. If a program allows an insertion point, objects must be selected by clicking and dragging. To select even a single character in a word processor, the mouse must be dragged across it. This means that the user will be doing quite a bit of clicking and dragging in the normal course of using the program, with the side effect that any drag-and-drop idiom will be more difficult to express. You can see this in Word,
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