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The Undiscoverable/Squeak (view source)
Revision as of 15:28, 23 August 2012
, 15:28, 23 August 2012→Mousing: Prerequisites and clarifications
==Mousing==
==Mousing==
We assume that the reader knows the most common mouse actions, at least left-click, right-click, click and drag to move objects or make selections, double-click, and the possibility of holding down a key while clicking (shift-click, control-click, command-click on Macs). Others, such as middle-click, triple-click, and mouse chords, require a bit of explanation. Click without modification means left-click in the rest of this document.
Triple-click is used in many text editors and word processors for selecting larger text units than double-clicking, which usually selects a word. Triple-clicking selects a line or a paragraph in such software. It is not used in Squeak.
Alan Kay's team at Xerox PARC (Palo Alto Research Center) designed Smalltalk to use a three-button mouse as shown here.
Alan Kay's team at Xerox PARC (Palo Alto Research Center) designed Smalltalk to use a three-button mouse as shown here.
[[File:800px-Xerox_Alto_mouse.jpg]]
[[File:800px-Xerox_Alto_mouse.jpg]]
Apple decided that three buttons was too confusing, and provided only one button (Boo, hiss!) on the Macintosh, so that you have to use confusing key-mouse combinations in Squeak on the Mac. A three-button mouse is discoverable. You point at things, and click different buttons, and different things happen. Arbitrary combinations, whether mouse chords or mouse-key combinations, are not in general discoverable.
Apple decided that three buttons was too confusing, and provided only one button (Boo, hiss!) on the Macintosh, so that you have to use confusing key-mouse combinations in Squeak on the Mac. A three-button mouse is discoverable. You point at things, and click different buttons, and different things happen. Arbitrary combinations, whether mouse chords or mouse-key combinations, are not in general discoverable without at least the hint that they are possible. But there are too many possibilities for most learners to explore systematically.
Some mice do have three buttons. On many wheel mice, you can depress the wheel as the middle button. On a two-button mouse, or a trackball, without a middle button, you might be able to click both the left and right buttons simultaneously ("chording") to get the middle button effects. This can also work using the two mouse buttons under a touchpad. Chording works on Linux, and can be programmed in some mouse drivers for particular devices on other platforms.
Some mice do have three buttons. On many wheel mice, you can depress the wheel as the middle button. On a two-button mouse, or a trackball, without a middle button, you might be able to click both the left and right buttons simultaneously ("chording") to get the middle button effects. This can also work using the two mouse buttons under a touchpad. Chording works on Linux, and can be programmed in some mouse drivers for particular devices on other platforms.
If you don't have a middle mouse button, and chording doesn't do it, then control-clicking should work.
If you don't have a middle mouse button, and chording doesn't do it, then control-clicking should work.
You can left-click on the title bar of either of the partly hidden windows and drag it to where you can read its contents. Both describe changes in the current Squeak image that do not concern us here. Click the x at the top left corner to close each one.
You can left-click on the title bar of a partly hidden window and drag it to where you can read its contents. Both Workspaces in the image below describe changes in the current Squeak image that do not concern us here. You can click the x at the top left corner to close each one.
You can scroll the remaining window with the mouse to view its contents, or click and drag any corner to resize it. This is different from other GUIs, where the edges of a window may be draggable, as in Linux, or only one corner, as in Mac OS.
You can scroll the remaining window with the mouse to view its contents, or click and drag any corner to resize it. This is different from other GUIs, where the edges of a window may be draggable, as in Linux, or only one corner, as in Mac OS.