4 Helpers
| stretchable-editor-snip-mixin : (class? . -> . class?) | ||
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Extends an editor snip the stretchable-snip<%> interface,
which allows it to be stretched to fit an
alignment-parent<%>’s allotted width. Stretchable snips are
useful as the snip of a snip-wrapper%
| stretchable-editor-snip% : class? | ||||
superclass: editor-snip% | ||||
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(new stretchable-editor-snip% [ [stretchable-width stretchable-width] [stretchable-height stretchable-height]]) → (is-a?/c stretchable-editor-snip%) stretchable-width : boolean? = #t stretchable-height : boolean? = #t Creates a stretchable snip with the given initial stretchability.
(fixed-width-label-snip possible-labels) → (subclass?/c snip%) possible-labels : (listof string?)
Returns a subclass of snip% that takes a single
initialization argument. The argument provided when instantiating the
class must be a member of possible-labels; the given label
is displayed by the snip, but the snip is sized to match the longest
of the labels in possible-labels.
In other words, the resulting class helps align multiple GUI elements t hat are labeled from a particular set of strings.
An interface for tabbing between embedded text%s.
(send a-tabbable-text set-caret-owner) → void? Moves the caret into the tabbable-text<%>.Called when tabbing ahead.Called when tabbing backward.
| tabbable-text-mixin : (class? . -> . class?) | ||
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Adds the tabbable-text<%> interface to an
editor:text% class, where instantiation installs key
bindings to tab ahead and backward
(set-tabbing a-text ...) → void? a-text : (is-a?/c tabbable-text<%>)
Sets the tabbing order of tabbable-text<%>s by setting each
text’s set-ahead and
set-back thunks to point to its neighbor in
the argument list.
| grey-editor-snip-mixin : (class? . -> . class?) | ||
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Gives an editor-snip% a colored background indicating that
is disabled. The editor is not disabled by the mixin however, and
must be locked separately.
| grey-editor-mixin : (class? . -> . class?) | ||
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Gives an editor<%> a colored background indicating that is
disabled. The editor is not disabled by the mixin however, and must be
locked separately.
| single-line-text-mixin : (class? . -> . class?) | ||
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Restricts a text to one line by overriding its key bindings to do
nothing on enter.
| cue-text-mixin : (class? . -> . class?) | ||
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Gives a text% an instantiation argument of a string that is
displayed in the text% initially in grey; the text
disappears when the text gets focus. This technique is useful for
labeling texts without needing to take up space.
| cue-text% : class? |
superclass: (cue-text-mixin text%) |
(new cue-text% [ [cue-text cue-text] [color color] [behavior behavior]]) → (is-a?/c cue-text%) cue-text : string? = "" color : string? = "gray"
behavior : (listof (one-of/c 'on-focus 'on-char)) = '(on-focus) Creates an instance with the given initial content, color, and behvior for when to clear the text.
(send a-cue-text clear-cue-text) → void? Clears the cue text, if it’s still present.