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NAMEMultilevel Selection Technique — Reference DescriptionMultilevel selection techniques are mouse-based variants of
other group techniques in which elements are selected in parts. Within scopes whose elements could be seen to be divided into
groups (at various levels), multilevel selection techniques can
be used to select a higher-level part of many elements at a time
by using multi-press or multi-click on the SELECT or ADJUST buttons. The number of clicks or presses control the level. For example,
within text, the following can occur: Double-click selects a word. Double-press, moving the pointer, and releasing
selects parts of words at a time. Higher numbers of presses or clicks may select lines,
sentences, paragraphs, or all the text in the scope.
In these examples, the use of the multilevel technique selects
ranges of characters — that is, text supports multilevel
range techniques. Any of the standard techniques (including adjustment) may
be used as a multilevel technique. For example: A multilevel range point technique
would involve a multiple click to select a part of many elements
(for example, double-pressing the SELECT button to select a word). A multilevel range adjust swipe technique would
adjust the selection by a part of many elements at a time (for example,
double-pressing the ADJUST button, moving the pointer, and releasing
the ADJUST button to adjust a text selection a word at a time).
In addition, you can use Ctrl
to augment multiple presses or clicks of the SELECT button to force
use of toggle mode. Table 18 “Multilevel Selection Technique
Methods” lists the techniques available. Table 18 Multilevel Selection Technique
Methods | Technique | Method |
|---|
| Multilevel point
technique | Multi-click SELECT | | Multilevel point
technique, forcing toggle mode | Multi-click Ctrl
SELECT | | Multilevel swipe
technique | Multi-press SELECT,
move pointer, release SELECT | | Multilevel swipe
technique, forcing toggle mode | Multi-press Ctrl
SELECT, move pointer, release SELECT | | Multilevel click
technique | Multi-click SELECT,
move pointer, click ADJUST | | Multilevel click
technique, forcing toggle mode | Multi-click Ctrl
SELECT, move pointer, click ADJUST | | Multilevel adjust
click technique | Multi-click ADJUST | | Multilevel adjust
swipe technique | Multi-press ADJUST,
move pointer, release ADJUST |
Guidelines- Required
After using a multilevel point technique: Identify the pointer position as the
anchor point. Define the selection region to consist of the part
of elements (depending on the number of clicks), if any, containing
the pointer. Define the anchor element to be the element in the
region nearest to the pointer. Define the anchor region to be the selection region. Place the active cursor as follows: At the anchor point, if it can be
placed there On the anchor element, if it is an element cursor Where the cursor previously was in the scope, if
there is no anchor element
- Required
When using a multilevel click or swipe technique: Identify the pointer position at initiation
of the technique as the anchor point. Define the selection region to consist of all elements
that would be selected when using the corresponding click or swipe
technique. Expand the selection region if all elements in its part
(depending on the number of presses) are also included in the region. Define the anchor element to be the element in the
selection region nearest to the pointer. Define the anchor region to be the selection region
that would be obtained if a multilevel point technique had been
used instead at the point at which the technique was initiated. Place the active cursor as follows: At the pointer position when the technique
was finished, if it can be placed there On the element at the other end of the range from
the anchor element, if you are using an element cursor, the region
is not empty, and range technique is in effect On an element within the selection region, if you
are using an element cursor, the region is not empty, and area technique
is in effect On the last element touched, if you are using an
element cursor, the region is not empty, and touch technique is
in effect Where the cursor previously was in the scope, if
none of the above are true
- Required
When using a multilevel point, swipe, or click technique
in select mode: Select all the elements in the selection
region. Deselect all other elements in the scope.
- Required
When using a multilevel point, swipe, or click technique
in toggle mode, toggle all elements in the selection region, based
on the toggling policy. - Required
When using an adjustment technique to adjust a selection
initially made using a multilevel technique, expand the selection
region so that if an element is in the region, all elements in its
part (depending on the number of times the SELECT button was pressed
in the initial technique) are also included in the region. - Required
When using a multilevel adjust click or swipe technique: Identify the pointer position at initiation
of the technique as the anchor point. Define the selection region to consist of all elements
that would be selected when using the corresponding adjust click
or swipe technique, but then expanded so that one of the following
occurs: If an element is added to the region,
also include all elements in its part (depending on the number of
times the ADJUST button is pressed) in the region. If an element is removed from the region, place
it back into the region, unless all elements in its part (depending
on the number of times the ADJUST button was pressed) are also included
in the region.
Define the anchor element to be the element in the
selection region nearest to the pointer. Define the anchor region to be the selection region
that would be obtained if a multilevel point technique had been
used instead at the point at which the technique was initiated.
Essential Related TopicsFor more information, see the Adjustment Techniques,
Selection Modes, and
Selection Techniques
reference pages. Supplemental Related TopicsFor more information, see the Selection Modes and
Selection Policies
reference pages. |
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