@@ -3,7 +3,7 @@ import 'package:flutter/material.dart';
33import '../utils/datetime.dart' ;
44
55/// An action that can be performed on a Gantt activity.
6- class GantActivityAction {
6+ class GanttActivityAction {
77 /// The icon representing the action.
88final IconData icon;
99
@@ -14,7 +14,7 @@ class GantActivityAction {
1414final String ? tooltip;
1515
1616 /// Creates an activity action with an icon, tap handler, and optional tooltip.
17- const GantActivityAction ({
17+ const GanttActivityAction ({
1818 required this .icon,
1919 required this .onTap,
2020 this .tooltip,
@@ -25,7 +25,7 @@ class GantActivityAction {
2525///
2626/// Each activity has a start/end date, title, and optional styling properties.
2727/// Activities can be hierarchical with parent-child relationships.
28- class GantActivity <T > {
28+ class GanttActivity <T > {
2929 /// Unique identifier for the activity.
3030late String key;
3131
@@ -54,16 +54,16 @@ class GantActivity<T> {
5454final Widget ? iconTitle;
5555
5656 /// The segments that make up this activity.
57- final List <GantActivitySegment >? segments;
57+ final List <GanttActivitySegment >? segments;
5858
5959 /// Child activities that are hierarchically under this one.
60- final List <GantActivity >? children;
60+ final List <GanttActivity >? children;
6161
6262 /// Actions that can be performed on this activity.
63- final List <GantActivityAction >? actions;
63+ final List <GanttActivityAction >? actions;
6464
6565 /// Callback when the activity cell is tapped.
66- final Function (GantActivity activity)? onCellTap;
66+ final Function (GanttActivity activity)? onCellTap;
6767
6868 /// Builder function for custom single cell rendering.
6969final Widget Function (DateTime cellDate)? cellBuilder;
@@ -75,24 +75,30 @@ class GantActivity<T> {
7575final bool showCell;
7676
7777 /// Builder function for custom cell rendering.
78- final Widget Function (GantActivity activity)? builder;
78+ final Widget Function (GanttActivity activity)? builder;
7979
8080 /// Optional custom data associated with the activity.
8181final T ? data;
8282
83- GantActivity ? _parent;
83+ GanttActivity ? _parent;
8484
8585 /// The parent activity, if this is a child activity.
86- GantActivity ? get parent => _parent;
86+ GanttActivity ? get parent => _parent;
8787
88- /// Creates a [GantActivity] with the specified properties.
88+ /// The limit of the start date of the activity.
89+ late DateTime ? limitStart;
90+
91+ /// The limit of the end date of the activity.
92+ late DateTime ? limitEnd;
93+
94+ /// Creates a [GanttActivity] with the specified properties.
8995 ///
9096 /// Throws an [AssertionError] if:
9197 /// - Start date is after end date
9298 /// - Only one between [title] and [titleWidget] must be provided
9399 /// - Any segment dates fall outside the activity dates
94100 /// - Any child activity dates fall outside this activity's dates
95- GantActivity ({
101+ GanttActivity ({
96102 required this .key,
97103 required DateTime start,
98104 required DateTime end,
@@ -111,6 +117,8 @@ class GantActivity<T> {
111117 this .showCell = true ,
112118 this .builder,
113119 this .data,
120+ this .limitStart,
121+ this .limitEnd,
114122 }) : assert (
115123 start.toDate.isBeforeOrSame (end.toDate) &&
116124 ((title == null ) != (titleWidget == null )) &&
@@ -145,22 +153,65 @@ class GantActivity<T> {
145153 String toString () => title ?? super .toString ();
146154
147155 /// Gets a flat list of this activity and all its descendants.
148- List <GantActivity > get plainList => [this , ...children? .plainList ?? []];
156+ List <GanttActivity > get plainList => [this , ...children? .plainList ?? []];
157+
158+ bool validStartMoveToParent (int days) =>
159+ parent == null ||
160+ ! parent! .showCell ||
161+ start.addDays (days).isAfterOrSame (parent! .start);
162+
163+ bool validStartMoveToChildren (int days) =>
164+ (children? .isEmpty ?? true ) == true ||
165+ start
166+ .addDays (days)
167+ .isBeforeOrSame (
168+ DateTimeEx .firstDateFromList (
169+ children! .map ((e) => e.start).toList (),
170+ ),
171+ );
172+
173+ bool validEndMoveToParent (int days) =>
174+ parent == null ||
175+ ! parent! .showCell ||
176+ end.addDays (days).isBeforeOrSame (parent! .end);
177+
178+ bool validEndMoveToChildren (int days) =>
179+ (children? .isEmpty ?? true ) == true ||
180+ end
181+ .addDays (days)
182+ .isAfterOrSame (
183+ DateTimeEx .lastDateFromList (children! .map ((e) => e.end).toList ()),
184+ );
185+
186+ bool validMoveToParent (int days) =>
187+ validStartMoveToParent (days) && validEndMoveToParent (days);
188+
189+ bool validStartMove (int days) =>
190+ validStartMoveToParent (days) &&
191+ validStartMoveToChildren (days) &&
192+ (limitStart == null || start.addDays (days).isAfterOrSame (limitStart! ));
193+
194+ bool validEndMove (int days) =>
195+ validEndMoveToParent (days) &&
196+ validEndMoveToChildren (days) &&
197+ (limitEnd == null || end.addDays (days).isBeforeOrSame (limitEnd! ));
198+
199+ bool validMove (int days) => validStartMove (days) && validEndMove (days);
149200}
150201
151- /// Extension methods for working with lists of [GantActivity ] .
152- extension GantActivityListExtension on List <GantActivity > {
202+ /// Extension methods for working with lists of [GanttActivity ] .
203+ extension GanttActivityListExtension on List <GanttActivity > {
153204 /// Gets a flat list of all activities and their descendants.
154- List <GantActivity > get plainList {
155- final as = < GantActivity > [];
205+ List <GanttActivity > get plainList {
206+ final as = < GanttActivity > [];
156207 for (var a in this ) {
157208 as .addAll (a.plainList);
158209 }
159210 return as ;
160211 }
161212
162213 /// Finds an activity by its key in the flattened list.
163- GantActivity ? getFromKey (String key) {
214+ GanttActivity ? getFromKey (String key) {
164215 final i = plainList.indexWhere ((e) => e.key == key);
165216 return i < 0 ? null : plainList[i];
166217 }
@@ -169,7 +220,7 @@ extension GantActivityListExtension on List<GantActivity> {
169220/// A segment of a Gantt activity.
170221///
171222/// Activities can be divided into segments to show progress or phases.
172- class GantActivitySegment {
223+ class GanttActivitySegment {
173224 /// The start date of the segment.
174225late DateTime start;
175226
@@ -183,15 +234,15 @@ class GantActivitySegment {
183234final String description;
184235
185236 /// Callback when the segment is tapped.
186- final Function (GantActivity activity)? onTap;
237+ final Function (GanttActivity activity)? onTap;
187238
188239 /// The color of the segment.
189240final Color ? color;
190241
191- /// Creates a [GantActivitySegment ] .
242+ /// Creates a [GanttActivitySegment ] .
192243 ///
193244 /// Throws an [AssertionError] if start date is after end date.
194- GantActivitySegment ({
245+ GanttActivitySegment ({
195246 required DateTime start,
196247 required DateTime end,
197248 required this .title,
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