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Manual task reordering feature (#6)

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This PR contains the work done to add support for manual todo task reordering in the *Task list* view

Reviewed-on: rock-n-code/todos-app#6
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>
This commit was merged in pull request #6.
This commit is contained in:
javier
2026-02-11 15:28:22 +00:00
committed by javier
parent cbf33302dd
commit ac0e0f6556
9 changed files with 298 additions and 101 deletions
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App/Sources/View Models/TaskListViewModel.swift
+39 -7
View File
@@ -15,17 +15,12 @@ extension TaskListView {
/// - Provides the localized title for the navigation bar
/// - Determines whether the completion filter toggle should be displayed
/// - Provides label and icon configuration for the completion toggle button
/// - Handles task reordering through drag and drop interactions
@Observable
final class ViewModel {
// MARK: Properties
/// The task group to display tasks for.
///
/// This property determines which tasks are fetched and displayed in the list.
/// It is used by the content view to initialize the SwiftData query with the appropriate predicates and sort descriptors for the group.
let group: TodoGroup
/// Whether to show completed tasks in the list.
///
/// This property controls the inclusion of completed tasks in the query results:
@@ -33,6 +28,13 @@ extension TaskListView {
/// - `false`: Completed tasks are filtered out at the database level
var showCompleted: Bool
/// The task group to display tasks for.
///
/// This property determines which tasks are fetched and displayed in the list.
/// It is used by the content view to initialize the SwiftData query with the appropriate
/// predicates and sort descriptors for the group.
let group: TodoGroup
// MARK: Initialization
/// Initializes a new view model instance for a specific task group.
@@ -40,7 +42,7 @@ extension TaskListView {
/// - Parameter group: The task group to display tasks for.
init(group: TodoGroup) {
self.group = group
showCompleted = false
self.showCompleted = false
}
// MARK: Computed Properties
@@ -82,6 +84,36 @@ extension TaskListView {
// MARK: Methods
/// Reorders tasks after a drag and drop operation.
///
/// This method is called when users drag and drop tasks to reorder them within a group.
/// It updates the `order` property of all tasks to reflect their new positions, ensuring
/// that the user's manual ordering preference is persisted.
///
/// - Parameters:
/// - tasks: The current array of tasks before reordering.
/// - source: The index set of items being moved (typically a single index).
/// - destination: The destination index where items should be inserted.
/// - Note: This method should only be called for groups where `canReorder` is `true`.
/// The view layer is responsible for only enabling drag and drop for applicable groups.
/// - SeeAlso: ``TodoGroup/canReorder`` for determining which groups support reordering.
func reorderTasks(
_ tasks: [Todo],
from source: IndexSet,
to destination: Int
) {
var updatedTasks = tasks
updatedTasks.move(
fromOffsets: source,
toOffset: destination
)
for (index, task) in updatedTasks.enumerated() {
task.order = index
}
}
/// Toggles the visibility of completed tasks.
///
/// This method flips the `showCompleted` state, which triggers SwiftUI to recreate the task list view and its children.