Press n or j to go to the next uncovered block, b, p or k for the previous block.
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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import type { CdkDragDrop } from '@angular/cdk/drag-drop';
import type { TreeItem } from './si-tree-view.model';
/**
*
* @param treeItems - TreeItem array which is used with the si-tree-view.
* @param event - event object which is emitted by cdkDropListDropped.
* @returns reordered TreeItems list.
*/
export const reorderTreeItem = (treeItems: TreeItem[], event: CdkDragDrop<any>): TreeItem[] => {
if (event.currentIndex === event.previousIndex) {
return treeItems;
}
const targetIndex =
event.currentIndex < event.previousIndex ? event.currentIndex - 1 : event.currentIndex;
modifyTreeStructure(treeItems, event, treeItems, targetIndex);
return treeItems;
};
/**
*
* @param sourceTreeItems - TreeItem array of the source tree from where item is being dragged.
* @param targetTreeItems - TreeItem array of the target tree where item is being dropped.
* @param event - event object which is emitted by cdkDropListDropped.
* @param removeFromSource - whether to remove item from its source tree after moving to target.
* @returns modified TreeItems list of source and target trees.
*/
export const transferTreeItem = (
sourceTreeItems: TreeItem[],
targetTreeItems: TreeItem[],
event: CdkDragDrop<TreeItem[]>,
removeFromSource: boolean = false
): {
sourceTree: TreeItem[];
targetTree: TreeItem[];
} => {
modifyTreeStructure(
sourceTreeItems,
event,
targetTreeItems,
event.currentIndex - 1,
removeFromSource
);
return {
sourceTree: sourceTreeItems,
targetTree: targetTreeItems
};
};
/**
*
* @param sourceTree - TreeItems array from where item needs to be removed.
* @param itemToRemove - TreeItem which needs to be removed.
* @returns Updated TreeItems array.
*/
export const removeItemFromTree = (sourceTree: TreeItem[], itemToRemove: TreeItem): TreeItem[] => {
const sourceItem = findTreeItem(sourceTree, itemToRemove);
const itemParent = sourceItem?.parent;
if (!itemParent) {
console.error('Item parent not found.');
return sourceTree;
}
if (itemParent.children) {
const itemIndex = itemParent.children.indexOf(itemToRemove);
itemParent.children?.splice(itemIndex, 1);
}
return sourceTree;
};
const findTreeItem = <T extends TreeItem>(array: T[], targetItem: T): T | null => {
for (const obj of array) {
// Check if the current item reference is the same as the target object reference
if (obj === targetItem) {
return obj; // Found the item, return it
}
// If the current item has nested children, recursively search within them
const key = 'children';
if (Array.isArray(obj[key])) {
const found = findTreeItem(obj[key] as T[], targetItem);
if (found) return found; // If found in nested array, return it
}
}
return null; // Object not found
};
const modifyTreeStructure = (
sourceItems: TreeItem[],
event: CdkDragDrop<TreeItem[]>,
targetItems: TreeItem[],
targetIndex: number,
removeFromSource = true
): void => {
const sourceTreeItem = findTreeItem(
sourceItems,
event.previousContainer.data[event.previousIndex]
);
Iif (!sourceTreeItem) {
console.error('Source tree item not found');
return;
}
const sourceTreeItemCopy = structuredClone(sourceTreeItem);
const targetTreeItem = findTreeItem<TreeItem>(
targetItems,
event.container.data[targetIndex < 0 ? 0 : targetIndex]
);
Iif (!targetTreeItem) {
console.error('Target tree item not found');
return;
}
if (findTreeItem(sourceTreeItem.children!, targetTreeItem)) {
console.error('Cannot move parent into its own child');
return;
}
const targetItemParent = targetTreeItem?.parent;
Iif (targetIndex < 0) {
sourceTreeItemCopy.parent = targetItemParent;
sourceTreeItemCopy.level = targetItemParent?.level ? targetItemParent.level + 1 : 0;
targetItemParent?.children?.splice(0, 0, sourceTreeItemCopy);
} else if (targetTreeItem?.state === 'expanded') {
sourceTreeItemCopy.parent = targetTreeItem;
sourceTreeItemCopy.level = targetTreeItem.level ? targetTreeItem.level + 1 : 0;
if (targetTreeItem.children?.length) {
targetTreeItem.children = [sourceTreeItemCopy, ...targetTreeItem.children];
} else E{
targetTreeItem.children = [sourceTreeItemCopy];
}
} else {
if (targetItemParent) {
const targetItemIndex = targetItemParent.children?.indexOf(targetTreeItem) ?? -1;
sourceTreeItemCopy.parent = targetItemParent;
sourceTreeItemCopy.level = targetItemParent.level ? targetItemParent.level + 1 : 0;
targetItemParent?.children?.splice(targetItemIndex + 1, 0, sourceTreeItemCopy);
}
}
const sourceTreeItemParent = sourceTreeItem.parent;
if (removeFromSource && sourceTreeItemParent) {
const sourceItemIndex = sourceTreeItemParent.children?.indexOf(sourceTreeItem) ?? -1;
sourceTreeItemParent?.children?.splice(sourceItemIndex, 1);
}
};
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