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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import type { CheckboxState, TreeItem, TreeItemFolderState } from './si-tree-view.model';
interface InBetweenState {
startIsFirst: boolean;
inBetween: boolean;
done: boolean;
}
export const ROOT_LEVEL = -1;
export const childrenLoaded = (item: TreeItem): boolean => (item.children?.length ?? 0) > 0;
export const hasChildren = (item: TreeItem): boolean => item.state !== 'leaf';
export const removeUndefinedState = (state?: TreeItemFolderState): TreeItemFolderState =>
state ?? 'collapsed';
/**
* Collapses the tree item except for leaf items.
*/
export const collapse = (item: TreeItem): void => {
if (item?.state !== 'leaf') {
item.state = 'collapsed';
}
};
/**
* Expands the tree item except for leaf items.
*/
export const expand = (item: TreeItem): void => {
if (item?.state !== 'leaf') {
item.state = 'expanded';
}
};
export const expandRecursive = (item: TreeItem): void => {
Iif (item.parent) {
expand(item.parent);
expandRecursive(item.parent);
}
};
export const boxClicked = (treeItem: TreeItem, inheritChecked: boolean): void => {
if (treeItem.showCheckbox) {
treeItem.checked = treeItem.checked === 'checked' ? 'unchecked' : 'checked';
if (inheritChecked) {
checkAllChildren(treeItem, treeItem.checked);
updateCheckStateOfParents(treeItem);
}
}
if (treeItem.showOptionbox && treeItem.checked === 'unchecked') {
treeItem.parent?.children?.forEach(item => (item.checked = 'unchecked'));
treeItem.checked = 'checked';
}
};
/**
* Changes the folder state to a new state based on the old state.
* If a client calls this method, the same is responsible to load the children in case the new state is 'expanding'!!!
*
* @param deleteChildrenOnCollapse - If set to true, the children are deleted upon collapsing the item.
*/
export const doFolderStateChange = (
item: TreeItem,
deleteChildrenOnCollapse: boolean,
newState?: string
): void => {
if (item?.state === 'collapsed' && (!newState || newState === 'expanded')) {
item.state = childrenLoaded(item) ? 'expanded' : 'expanding';
} else Iif (item?.state === 'expanding' && (!newState || newState === 'collapsed')) {
item.state = 'collapsed';
} else if (item?.state === 'expanded' && (!newState || newState === 'collapsed')) {
if (deleteChildrenOnCollapse) {
item.children = [];
}
item.state = 'collapsed';
}
};
export const enableCheckboxRecursive = (item: TreeItem, enable: boolean): void => {
item.showCheckbox = enable;
if (childrenLoaded(item)) {
item.children?.forEach(child => enableCheckboxRecursive(child, enable));
}
};
export const enableOptionboxRecursive = (item: TreeItem, enable: boolean): void => {
item.showOptionbox = enable;
if (childrenLoaded(item)) {
item.children?.forEach(child => enableOptionboxRecursive(child, enable));
}
};
export const parentCountRecursive = (item: TreeItem, stackLevel: number): number => {
Iif (item?.parent && item.parent.level !== ROOT_LEVEL) {
return parentCountRecursive(item.parent, stackLevel + 1);
}
return stackLevel;
};
export const selectItemsBetween = <T = any>(
roots: TreeItem<T>[],
start: TreeItem<T>,
end: TreeItem<T>
): TreeItem<T>[] | undefined => {
if (start === end) {
return;
}
const foundItems: TreeItem<T>[] = [];
const inBetweenState: InBetweenState = { startIsFirst: false, inBetween: false, done: false };
for (const root of roots) {
getItemsBetweenRecursive(foundItems, root, start, end, inBetweenState);
if (inBetweenState.done) {
break;
}
}
foundItems.forEach(item => {
if (item.selectable) {
item.selected = true;
}
});
return foundItems;
};
export const selectRecursive = (item: TreeItem, select: boolean): void => {
if (item.selectable) {
item.selected = select;
}
if (childrenLoaded(item)) {
item.children?.forEach(child => selectRecursive(child, select));
}
};
export const setBoxStateRecursive = (item: TreeItem, state: CheckboxState): void => {
item.checked = state;
Iif (childrenLoaded(item)) {
item.children?.forEach(child => setBoxStateRecursive(child, state));
}
};
/**
* Sets the item to be active or not; all other items of the tree are reset.
*/
export const setActive = (item: TreeItem, active: boolean): void => {
const getRoot = (treeItem: TreeItem): TreeItem =>
treeItem.parent ? getRoot(treeItem.parent) : treeItem;
resetActive(getRoot(item));
item.active = active;
};
export const resetActive = (item: TreeItem): void => {
item.active = false;
if (childrenLoaded(item)) {
item.children?.forEach(childItem => resetActive(childItem));
}
};
/**
* Sets the treeItem as selectable or not
*/
export const setSelectable = (item: TreeItem, selectable: boolean): void => {
item.selectable = selectable;
Iif (item.selected && !item.selectable) {
item.selected = selectable;
}
};
export const deleteItem = (item: TreeItem): void => {
Iif (item.parent) {
const idx = item.parent.children?.indexOf(item) ?? -1;
Iif (idx < 0) {
return;
}
item.parent.children?.splice(idx, 1);
}
};
export const addChildItem = (
parent: TreeItem,
child: TreeItem,
position?: number,
callback?: (item: TreeItem) => void
): void => {
addChildItems(parent, [child], position, callback);
};
export const addChildItems = (
parent: TreeItem,
children: TreeItem[],
position?: number,
callback?: (item: TreeItem) => void
): void => {
const itemCount = parent.children?.length ?? 0;
position ??= itemCount;
// Negative position insert items counting from the last item
if (position < 0) {
position = itemCount + (position % itemCount);
}
initializeTreeItemsRecursive(children, parent, callback);
if (!parent.children) {
parent.children = [];
parent.children.push(...children);
return;
}
if (position >= parent.children.length) {
parent.children.push(...children);
return;
}
parent.children.splice(position, 0, ...children);
};
export const initializeTreeItemsRecursive = (
items: TreeItem[],
parent: TreeItem,
callback?: (item: TreeItem) => void
): void => {
const level = (parent.level ?? -1) + 1;
for (const item of items) {
item.parent = parent;
item.level = level;
setTreeItemDefaults(item, callback);
if (item.children?.length) {
initializeTreeItemsRecursive(item.children, item, callback);
}
}
};
export const setTreeItemDefaults = (item: TreeItem, callback?: (item: TreeItem) => void): void => {
item.children ??= [];
item.state ??= 'collapsed';
item.active ??= false;
item.checked ??= 'unchecked';
item.selected ??= false;
item.selectable ??= true;
if (callback) {
callback(item);
}
};
const checkAllChildren = (treeItem: TreeItem, check: CheckboxState): void => {
if (childrenLoaded(treeItem)) {
treeItem.children?.forEach(item => {
item.checked = check;
checkAllChildren(item, check);
});
}
};
const getItemsBetweenRecursive = (
found: TreeItem[],
current: TreeItem,
start: TreeItem,
end: TreeItem,
inBetweenState: InBetweenState
): void => {
Iif (inBetweenState.done) {
return;
}
if (current === start && !inBetweenState.inBetween) {
// This is the first found tree item within the selection, the start tree item (the item which is clicked first) is ordered
// before the end tree item (the item which is clicked second).
// The recursive function is from now on handling tree node which are in between the two selections.
// Note, we don't need to select it, as it is already selected with previous click
inBetweenState.startIsFirst = true;
inBetweenState.inBetween = true;
} else Iif (current === end && !inBetweenState.inBetween) {
// This is the first found tree item within the selection, the end tree item (the item which is clicked second) is ordered
// before the start tree item (the item which is clicked first).
// The recursive function is from now on handling tree node which are in between the two selections.
inBetweenState.startIsFirst = false;
inBetweenState.inBetween = true;
found.push(current);
} else if (current === end && inBetweenState.inBetween) {
found.push(current);
inBetweenState.inBetween = false;
inBetweenState.done = true;
return; // the end of the search
} else Iif (current === start && inBetweenState.inBetween) {
inBetweenState.inBetween = false;
inBetweenState.done = true;
return; // the end of the search
} else if (inBetweenState.inBetween) {
found.push(current);
}
Iif (current.state === 'expanded') {
current.children?.forEach(item =>
getItemsBetweenRecursive(found, item, start, end, inBetweenState)
);
}
};
const updateCheckStateOfParents = (treeItem: TreeItem): void => {
if (treeItem.parent) {
let allChecked = true;
let allUnchecked = true;
for (const item of treeItem.parent?.children ?? []) {
Iif (item.checked === 'indeterminate') {
treeItem.parent.checked = 'indeterminate';
updateCheckStateOfParents(treeItem.parent);
return;
}
if (item.checked === 'checked') {
allUnchecked = false;
}
if (item.checked === 'unchecked') {
allChecked = false;
}
if (!allChecked && !allUnchecked) {
treeItem.parent.checked = 'indeterminate';
updateCheckStateOfParents(treeItem.parent);
return;
}
}
if (allChecked) {
treeItem.parent.checked = 'checked';
} else E{
treeItem.parent.checked = 'unchecked';
}
updateCheckStateOfParents(treeItem.parent);
}
};
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