1Prima::IntUtils(3)    User Contributed Perl Documentation   Prima::IntUtils(3)
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NAME

6       Prima::IntUtils - internal functions
7

DESCRIPTION

9       The module provides packages, containing common functionality for some
10       standard classes. The packages are designed as a code containers, not
11       as widget classes, and are to be used as secondary ascendants in the
12       widget inheritance declaration.
13

Prima::MouseScroller

15       Implements routines for emulation of auto repeating mouse events.  A
16       code inside "MouseMove" callback can be implemented by the following
17       scheme:
18
19               if ( mouse_pointer_inside_the_scrollable_area) {
20                       $self-> scroll_timer_stop;
21               } else {
22                       $self-> scroll_timer_start unless $self-> scroll_timer_active;
23                       return unless $self-> scroll_timer_semaphore;
24                       $self-> scroll_timer_semaphore( 0);
25               }
26
27       The class uses a semaphore "{mouseTransaction}", which should be set to
28       non-zero if a widget is in mouse capture state, and set to zero or
29       "undef" otherwise.
30
31       The class starts an internal timer, which sets a semaphore and calls
32       "MouseMove" notification when triggered. The timer is assigned the
33       timeouts, returned by "Prima::Application::get_scroll_rate" ( see
34       "get_scroll_rate" in Prima::Application ).
35
36   Methods
37       scroll_timer_active
38           Returns a boolean value indicating if the internal timer is
39           started.
40
41       scroll_timer_semaphore [ VALUE ]
42           A semaphore, set to 1 when the internal timer was triggered. It is
43           advisable to check the semaphore state to discern a timer-generated
44           event from the real mouse movement. If VALUE is specified, it is
45           assigned to the semaphore.
46
47       scroll_timer_start
48           Starts the internal timer.
49
50       scroll_timer_stop
51           Stops the internal timer.
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Prima::IntIndents

54       Provides the common functionality for the widgets that delegate part of
55       their surface to the border elements. A list box can be of an example,
56       where its scroll bars and 3-d borders are such elements.
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58   Properties
59       indents ARRAY
60           Contains four integers, specifying the breadth of decoration
61           elements for each side. The first integer is width of the left
62           element, the second - height of the lower element, the third -
63           width of the right element, the fourth - height of the upper
64           element.
65
66           The property can accept and return the array either as a four
67           scalars, or as an anonymous array of four scalars.
68
69   Methods
70       get_active_area [ TYPE = 0, WIDTH, HEIGHT ]
71           Calculates and returns the extension of the area without the border
72           elements, or the active area.  The extension are related to the
73           current size of a widget, however, can be overridden by specifying
74           WIDTH and HEIGHT. TYPE is an integer, indicating the type of
75           calculation:
76
77           TYPE = 0
78               Returns four integers, defining the area in the inclusive-
79               exclusive coordinates.
80
81           TYPE = 1
82               Returns four integers, defining the area in the inclusive-
83               inclusive coordinates.
84
85           TYPE = 2
86               Returns two integers, the size of the area.
87

Prima::GroupScroller

89       The class is used for widgets that contain optional scroll bars, and
90       provides means for their maintenance. The class is the descendant of
91       Prima::IntIndents, and adjusts the indents property when scrollbars are
92       shown or hidden, or borderWidth is changed.
93
94       The class does not provide range selection for the scrollbars; the
95       descentant classes must implement that.
96
97       The descendant classes must follow the guidelines:
98
99       ·   A class must provide "borderWidth", "hScroll", and "vScroll"
100           property keys in profile_default() .  A class may provide
101           "autoHScroll" and "autoVScroll" property keys in profile_default()
102           .
103
104       ·   A class' init() method must set "{borderWidth}", "{hScroll}", and
105           "{vScroll}" variables to 0 before the initialization, call
106           "setup_indents" method, and then assign the properties from the
107           object profile.
108
109           If a class provides "autoHScroll" and "autoVScroll" properties,
110           these must be set to 0 before the initialization.
111
112       ·   If a class needs to overload one of "borderWidth", "hScroll",
113           "vScroll", "autoHScroll", and "autoVScroll" properties, it is
114           mandatory to call the inherited properties.
115
116       ·   A class must implement the scroll bar notification callbacks:
117           "HScroll_Change" and "VScroll_Change".
118
119       ·   A class must not use the reserved variable names, which are:
120
121                   {borderWidth}  - internal borderWidth storage
122                   {hScroll}      - internal hScroll value storage
123                   {vScroll}      - internal vScroll value storage
124                   {hScrollBar}   - pointer to the horizontal scroll bar
125                   {vScrollBar}   - pointer to the vertical scroll bar
126                   {bone}         - rectangular widget between the scrollbars
127                   {autoHScroll}  - internal autoHScroll value storage
128                   {autoVScroll}  - internal autoVScroll value storage
129
130           The reserved method names:
131
132                   set_h_scroll
133                   set_v_scroll
134                   insert_bone
135                   setup_indents
136                   reset_indents
137                   borderWidth
138                   autoHScroll
139                   autoVScroll
140                   hScroll
141                   vScroll
142
143           The reserved widget names:
144
145                   HScroll
146                   VScroll
147                   Bone
148
149   Properties
150       autoHScroll BOOLEAN
151           Selects if the horizontal scrollbar is to be shown and hidden
152           dynamically, depending on the widget layout.
153
154       autoVScroll BOOLEAN
155           Selects if the vertical scrollbar is to be shown and hidden
156           dynamically, depending on the widget layout.
157
158       borderWidth INTEGER
159           Width of 3d-shade border around the widget.
160
161           Recommended default value: 2
162
163       hScroll BOOLEAN
164           Selects if the horizontal scrollbar is visible. If it is,
165           "{hScrollBar}" points to it.
166
167       vScroll BOOLEAN
168           Selects if the vertical scrollbar is visible. If it is,
169           "{vScrollBar}" points to it.
170
171       scrollBarClass STRING = Prima::ScrollBar
172           Create-only property that allows to change scrollbar class
173
174       hScrollBarProfile, vScrollBarProfile HASH
175           Create-only property that allows to change scrollbar parameters
176           when it is being created
177
178   Properties
179       setup_indents
180           The method is never called directly; it should be called whenever
181           widget layout is changed so that indents are affected. The method
182           is a request to recalculate indents, depending on the widget
183           layout.
184
185           The method is not reentrant; to receive this callback and update
186           the widget layout, that in turn can result in more "setup_indents"
187           calls, overload "reset_indents" .
188
189       reset_indents
190           Called after "setup_indents" is called and internal widget layout
191           is updated, to give a chance to follow-up the layout changes.
192

Prima::UndoActions

194       Used for classes that can edit and undo and redo its content.
195
196   Properties
197       undoLimit INTEGER
198           Sets limit on number of stored atomic undo operations. If 0, undo
199           is disabled.
200
201   Methods
202       begin_undo_group
203           Opens bracket for group of actions, undone as single operation.
204           The bracket is closed by calling "end_undo_group".
205
206       end_undo_group
207           Closes bracket for group of actions, opened by "begin_undo_group".
208
209       redo
210           Re-applies changes, formerly rolled back by "undo".
211
212       undo
213           Rolls back changes into internal array, which size cannot extend
214           "undoLimit" value. In case "undoLimit" is 0, no undo actions can be
215           made.
216

AUTHOR

218       Dmitry Karasik, <dmitry@karasik.eu.org>.
219

SEE ALSO

221       Prima, Prima::Widget, Prima::InputLine, Prima::Lists, Prima::Edit,
222       Prima::Outlines, Prima::ScrollBar.
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226perl v5.30.1                      2020-01-30                Prima::IntUtils(3)
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