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import { property } from 'lit/decorators.js';
import { CustomEventType } from '../interfaces';
import { RapidElement } from '../RapidElement';
/**
* A simple list that can be sorted by dragging
*/
// how far we have to drag before it starts
const DRAG_THRESHOLD = 2;
// padding around container for external drag detection
const EXTERNAL_DRAG_PADDING = 50;
export class SortableList extends RapidElement {
originalDownDisplay: string;
static get styles() {
return css`
:host {
margin: auto;
}
.container {
user-select: none;
position: relative;
display: grid;
grid-template-columns: 1fr;
}
.container.horizontal {
display: flex;
flex-wrap: wrap;
align-items: center;
}
.dragging {
background: var(--color-selection);
}
.slot {
flex-grow: 1;
}
slot > * {
user-select: none;
touch-action: none;
}
temba-icon {
opacity: 0.1;
padding: 0.2em 0.5em;
transition: all 300ms ease-in-out;
}
`;
}
@property({ type: String })
draggingId: string;
@property({ type: Boolean })
horizontal: boolean = false;
@property({ type: String })
dropTargetId: string;
@property({ type: String })
dragHandle: string;
@property({ type: String })
gap: string = '0em';
@property({ type: Boolean })
externalDrag: boolean = false;
/**
* Optional callback to allow parent components to customize the ghost node.
* Called after the ghost node is cloned but before it is appended to the DOM.
*/
@property({ attribute: false })
prepareGhost?: (ghost: HTMLElement) => void;
ghostElement: HTMLDivElement = null;
downEle: HTMLDivElement = null;
originalElementRect: DOMRect = null; // Store viewport dimensions for ghost
originalLayoutSize: { width: number; height: number } = null; // Store layout dimensions for placeholders
originalDragIndex: number = -1; // Store original index before moving element
xOffset = 0;
yOffset = 0;
yDown = 0;
xDown = 0;
draggingIdx = -1;
draggingEle = null;
dropPlaceholder: HTMLDivElement = null;
pendingDropIndex = -1;
pendingTargetElement: HTMLElement = null;
pendingInsertAfter: boolean = null;
isExternalDrag = false;
private clickBlocker: ((e: MouseEvent) => void) | null = null;
public constructor() {
super();
this.handleMouseMove = this.handleMouseMove.bind(this);
this.handleMouseUp = this.handleMouseUp.bind(this);
this.handleMouseDown = this.handleMouseDown.bind(this);
this.handleTouchMove = this.handleTouchMove.bind(this);
this.handleTouchEnd = this.handleTouchEnd.bind(this);
this.handleTouchStart = this.handleTouchStart.bind(this);
}
private getSortableElements(): Element[] {
const eles = this.shadowRoot
.querySelector('slot')
.assignedElements()
.filter(
(ele) =>
ele.classList.contains('sortable') &&
!ele.classList.contains('drop-placeholder')
);
return eles;
}
private isMouseOverContainer(mouseX: number, mouseY: number): boolean {
const container = this.shadowRoot.querySelector('.container');
if (!container) return false;
const rect = container.getBoundingClientRect();
// add some padding to make it easier to stay within the container
return (
mouseX >= rect.left - EXTERNAL_DRAG_PADDING &&
mouseX <= rect.right + EXTERNAL_DRAG_PADDING &&
mouseY >= rect.top - EXTERNAL_DRAG_PADDING &&
mouseY <= rect.bottom + EXTERNAL_DRAG_PADDING
);
}
private cloneElementWithState(element: HTMLElement): HTMLElement {
// First create a basic clone
const clone = element.cloneNode(true) as HTMLElement;
// Helper function to copy form element values recursively
const copyFormValues = (original: HTMLElement, cloned: HTMLElement) => {
try {
// Copy input values
const originalInputs = original.querySelectorAll(
'input, textarea, select'
);
const clonedInputs = cloned.querySelectorAll('input, textarea, select');
originalInputs.forEach((originalInput, index) => {
const clonedInput = clonedInputs[index] as
| HTMLInputElement
| HTMLTextAreaElement
| HTMLSelectElement;
if (clonedInput) {
if (originalInput instanceof HTMLInputElement) {
const originalHtmlInput = originalInput as HTMLInputElement;
const clonedHtmlInput = clonedInput as HTMLInputElement;
if (
originalHtmlInput.type === 'checkbox' ||
originalHtmlInput.type === 'radio'
) {
clonedHtmlInput.checked = originalHtmlInput.checked;
} else {
clonedHtmlInput.value = originalHtmlInput.value;
}
} else if (originalInput instanceof HTMLTextAreaElement) {
(clonedInput as HTMLTextAreaElement).value = originalInput.value;
} else if (originalInput instanceof HTMLSelectElement) {
(clonedInput as HTMLSelectElement).selectedIndex =
originalInput.selectedIndex;
}
}
});
// Copy properties from all custom elements that might have a value property
const allOriginalElements = Array.from(original.querySelectorAll('*'));
const allClonedElements = Array.from(cloned.querySelectorAll('*'));
allOriginalElements.forEach((originalEl, index) => {
const clonedEl = allClonedElements[index];
if (clonedEl && originalEl) {
// Special handling for temba components
if (
originalEl.tagName &&
originalEl.tagName.toLowerCase().startsWith('temba-')
) {
try {
// Copy common temba component properties
const tembaProps = [
'value',
'values',
'selectedValue',
'checked',
'selected',
'textContent'
];
tembaProps.forEach((prop) => {
if (
prop in originalEl &&
(originalEl as any)[prop] !== undefined
) {
(clonedEl as any)[prop] = (originalEl as any)[prop];
}
});
// Copy all attributes for temba components to preserve state
Array.from(originalEl.attributes).forEach((attr) => {
clonedEl.setAttribute(attr.name, attr.value);
});
} catch (e) {
// Ignore errors when copying temba properties
}
} else {
// Try to copy value property for other elements
try {
if (
'value' in originalEl &&
(originalEl as any).value !== undefined
) {
(clonedEl as any).value = (originalEl as any).value;
}
} catch (e) {
// Ignore errors when copying properties
}
// Copy data attributes that might contain state
try {
Array.from(originalEl.attributes).forEach((attr) => {
if (
attr.name.startsWith('data-') ||
attr.name.startsWith('aria-')
) {
clonedEl.setAttribute(attr.name, attr.value);
}
});
} catch (e) {
// Ignore errors when copying attributes
}
}
}
});
} catch (e) {
// If anything fails, just return the basic clone
console.warn('Failed to copy form values in cloneElementWithState:', e);
}
};
// Copy form values for the root element and all descendants
copyFormValues(element, clone);
return clone;
}
public getIds() {
return this.getSortableElements().map((ele) => ele.id);
}
private getRowIndex(id: string): number {
return this.getSortableElements().findIndex((ele) => ele.id === id);
}
private getDropTargetInfo(
mouseX: number,
mouseY: number
): { element: HTMLDivElement; insertAfter: boolean } | null {
const elements = this.getSortableElements().filter(
(ele) => ele.id !== this.draggingEle?.id
);
if (elements.length === 0) return null;
if (this.horizontal) {
// For horizontal (possibly wrapping) layouts, compare in reading order:
// row first (Y), then column (X). Items in DOM order may span
// multiple rows when the container uses flex-wrap.
for (let i = 0; i < elements.length; i++) {
const ele = elements[i];
const rect = ele.getBoundingClientRect();
const centerX = rect.left + rect.width / 2;
// Mouse is on a row above this element — insert before it
if (mouseY < rect.top) {
return { element: ele as HTMLDivElement, insertAfter: false };
}
// Mouse is on the same row — compare X within the row
if (mouseY < rect.bottom) {
if (mouseX < centerX) {
return { element: ele as HTMLDivElement, insertAfter: false };
}
}
// Mouse is below this element's row — continue to next element
}
// If we're past all elements, insert after the last one
return {
element: elements[elements.length - 1] as HTMLDivElement,
insertAfter: true
};
} else {
// For vertical layout, find the insertion point based on mouse Y position
for (let i = 0; i < elements.length; i++) {
const ele = elements[i];
const rect = ele.getBoundingClientRect();
const centerY = rect.top + rect.height / 2;
if (mouseY < centerY) {
// Insert before this element
return { element: ele as HTMLDivElement, insertAfter: false };
}
}
// If we're past all elements, insert after the last one
return {
element: elements[elements.length - 1] as HTMLDivElement,
insertAfter: true
};
}
}
/**
* Creates the persistent placeholder element (once per drag).
*/
private ensurePlaceholder() {
if (this.dropPlaceholder) return;
this.dropPlaceholder = document.createElement('div');
this.dropPlaceholder.className = 'drop-placeholder sortable';
if (this.originalLayoutSize) {
const size = this.originalLayoutSize;
this.dropPlaceholder.style.width = size.width + 'px';
this.dropPlaceholder.style.height = size.height + 'px';
this.dropPlaceholder.style.minHeight = size.height + 'px';
this.dropPlaceholder.style.borderRadius = 'var(--curvature)';
this.dropPlaceholder.style.flexShrink = '0';
this.dropPlaceholder.style.background = '#f3f4f6';
this.dropPlaceholder.style.outline = '2px dashed #d1d5db';
this.dropPlaceholder.style.outlineOffset = '-2px';
}
}
/**
* Inserts the placeholder adjacent to targetElement.
* Reuses the existing element — insertAdjacentElement atomically
* moves it if it is already in the DOM.
*/
private insertPlaceholder(targetElement: HTMLElement, insertAfter: boolean) {
if (!targetElement || !this.draggingEle) return;
if (targetElement === this.draggingEle) return;
this.ensurePlaceholder();
if (insertAfter) {
targetElement.insertAdjacentElement('afterend', this.dropPlaceholder);
} else {
targetElement.insertAdjacentElement('beforebegin', this.dropPlaceholder);
}
}
private hideDropPlaceholder() {
if (this.dropPlaceholder) {
this.dropPlaceholder.remove();
this.dropPlaceholder = null;
}
}
private showInitialPlaceholder() {
if (!this.downEle || !this.originalElementRect) return;
this.ensurePlaceholder();
// Insert the placeholder right after the hidden original element
this.downEle.insertAdjacentElement('afterend', this.dropPlaceholder);
}
/**
* Shared drag-start logic for both mouse and touch.
* Returns true if a drag target was found and state was initialised.
*/
private beginDrag(
target: HTMLElement,
clientX: number,
clientY: number
): boolean {
// if we have a drag handle, only allow dragging from that element
if (this.dragHandle) {
if (!target.classList.contains(this.dragHandle)) {
return false;
}
}
const ele = target.closest('.sortable') as HTMLDivElement;
if (!ele) return false;
this.downEle = ele;
this.draggingId = ele.id;
this.draggingIdx = this.getRowIndex(ele.id);
this.draggingEle = ele;
const rect = ele.getBoundingClientRect();
this.originalElementRect = rect;
this.originalLayoutSize = {
width: ele.offsetWidth,
height: ele.offsetHeight
};
this.xOffset = clientX - rect.left;
this.yOffset = clientY - rect.top;
this.yDown = clientY;
this.xDown = clientX;
return true;
}
private handleMouseDown(event: MouseEvent) {
if (
this.beginDrag(event.target as HTMLElement, event.clientX, event.clientY)
) {
event.preventDefault();
event.stopPropagation();
document.addEventListener('mousemove', this.handleMouseMove);
document.addEventListener('mouseup', this.handleMouseUp);
}
}
/* c8 ignore start -- touch-only handlers */
private handleTouchStart(event: TouchEvent) {
const touch = event.touches[0];
if (!touch) return;
if (
this.beginDrag(event.target as HTMLElement, touch.clientX, touch.clientY)
) {
event.stopPropagation();
document.addEventListener('touchmove', this.handleTouchMove, {
passive: false
});
document.addEventListener('touchend', this.handleTouchEnd);
document.addEventListener('touchcancel', this.handleTouchEnd);
}
}
/* c8 ignore stop */
/**
* Shared drag-move logic for both mouse and touch.
*/
private processDragMove(clientX: number, clientY: number) {
if (
!this.ghostElement &&
this.downEle &&
(Math.abs(clientY - this.yDown) > DRAG_THRESHOLD ||
Math.abs(clientX - this.xDown) > DRAG_THRESHOLD)
) {
this.fireCustomEvent(CustomEventType.DragStart, {
id: this.downEle.id
});
// Capture the original index BEFORE hiding the element
this.originalDragIndex = this.getRowIndex(this.downEle.id);
// Create a clone of the element to use as the ghost
this.ghostElement = this.cloneElementWithState(
this.downEle
) as HTMLDivElement;
// Hide the original element during dragging using inline styles
this.originalDownDisplay = this.downEle.style.display;
this.downEle.style.display = 'none';
// Style the clone as a ghost
this.ghostElement.classList.add('ghost');
// Detect ancestor scale transform (e.g. zoom) by comparing viewport
// to layout dimensions, so the ghost renders content at the right scale
const rect = this.originalElementRect;
const layoutSize = this.originalLayoutSize;
const ancestorScale =
layoutSize.width > 0 ? rect.width / layoutSize.width : 1;
const hasAncestorScale = Math.abs(ancestorScale - 1) > 0.001;
this.ghostElement.style.position = 'fixed';
this.ghostElement.style.left = clientX - this.xOffset + 'px';
this.ghostElement.style.top = clientY - this.yOffset + 'px';
this.ghostElement.style.zIndex = '99999';
this.ghostElement.style.opacity = '0.8';
if (hasAncestorScale) {
// Use layout dimensions with ancestor scale so content renders correctly
this.ghostElement.style.width = layoutSize.width + 'px';
this.ghostElement.style.height = layoutSize.height + 'px';
this.ghostElement.style.transform = `scale(${ancestorScale * 1.03})`;
this.ghostElement.style.transformOrigin = '0 0';
} else {
this.ghostElement.style.width = rect.width + 'px';
this.ghostElement.style.height = rect.height + 'px';
this.ghostElement.style.transform = 'scale(1.03)';
}
// allow component to customize the ghost node
if (this.prepareGhost) {
this.prepareGhost(this.ghostElement);
}
// Add the clone to document.body for dragging
document.body.appendChild(this.ghostElement);
// Show initial placeholder in the original position to maintain layout
this.showInitialPlaceholder();
// Add global click blocker when drag starts
if (!this.clickBlocker) {
this.clickBlocker = (e: MouseEvent) => {
e.stopPropagation();
e.preventDefault();
};
// Use capture phase to intercept clicks before they reach any elements
document.addEventListener('click', this.clickBlocker, true);
}
}
if (this.ghostElement) {
this.ghostElement.style.left = clientX - this.xOffset + 'px';
this.ghostElement.style.top = clientY - this.yOffset + 'px';
// check if the drag is over the container (only if external dragging is allowed)
const isOverContainer = this.externalDrag
? this.isMouseOverContainer(clientX, clientY)
: true; // always consider "over container" if external drag is disabled
// detect transition between internal and external drag (only if allowed)
if (this.externalDrag && !isOverContainer && !this.isExternalDrag) {
// transitioning to external drag
this.isExternalDrag = true;
this.hideDropPlaceholder();
// hide the ghost element when dragging externally
if (this.ghostElement) {
this.ghostElement.style.display = 'none';
}
this.fireCustomEvent(CustomEventType.DragExternal, {
id: this.downEle.id,
mouseX: clientX,
mouseY: clientY
});
} else if (this.externalDrag && isOverContainer && this.isExternalDrag) {
// transitioning back to internal drag
this.isExternalDrag = false;
// show the ghost element again when dragging internally
if (this.ghostElement) {
this.ghostElement.style.display = 'block';
}
this.fireCustomEvent(CustomEventType.DragInternal, {
id: this.downEle.id
});
}
// only show drop placeholder and calculate drop position if internal drag
if (!this.isExternalDrag) {
// Detach the placeholder before measuring so its presence cannot
// shift element positions (e.g. flex-wrap reflow) and feed back
// into the calculation, which would cause oscillation.
if (this.dropPlaceholder) {
this.dropPlaceholder.remove();
}
const targetInfo = this.getDropTargetInfo(clientX, clientY);
if (targetInfo) {
const { element: targetElement, insertAfter } = targetInfo;
const targetIdx = this.getRowIndex(targetElement.id);
// Use the original drag index we captured before moving the element
const originalDragIdx = this.originalDragIndex;
// Calculate where the dragged element will end up in the final array
// targetIdx is the position of target element in current DOM (missing dragged element)
let dropIdx;
if (targetIdx < originalDragIdx) {
// Target is before the original drag position - moving backward
dropIdx = insertAfter ? targetIdx + 1 : targetIdx;
} else {
// Target was originally after the drag position - moving forward
dropIdx = insertAfter ? targetIdx : targetIdx - 1;
}
// Only update state when the logical position changes
if (dropIdx !== this.pendingDropIndex) {
this.dropTargetId = targetElement.id;
this.pendingDropIndex = dropIdx;
this.pendingTargetElement = targetElement;
this.pendingInsertAfter = insertAfter;
}
// Re-insert placeholder at the (possibly unchanged) position.
// insertPlaceholder reuses the same DOM element so there is
// no destroy/create flash.
this.insertPlaceholder(
this.pendingTargetElement,
this.pendingInsertAfter
);
} else {
this.hideDropPlaceholder();
this.dropTargetId = null;
this.pendingDropIndex = -1;
this.pendingTargetElement = null;
this.pendingInsertAfter = null;
}
} else {
// external drag - continue firing external drag events with updated position
this.fireCustomEvent(CustomEventType.DragExternal, {
id: this.downEle.id,
mouseX: clientX,
mouseY: clientY
});
}
}
}
private handleMouseMove(event: MouseEvent) {
this.processDragMove(event.clientX, event.clientY);
}
/* c8 ignore next 6 -- touch-only */
private handleTouchMove(event: TouchEvent) {
const touch = event.touches[0];
if (!touch) return;
event.preventDefault();
this.processDragMove(touch.clientX, touch.clientY);
}
/**
* Shared drag-end logic for both mouse and touch.
*/
private processDragEnd(clientX: number, clientY: number) {
if (this.draggingId && this.ghostElement) {
// Remove the ghost clone from document.body
if (this.ghostElement) {
this.ghostElement.remove();
}
// Restore visibility of the original element by clearing inline styles
if (this.downEle) {
this.downEle.style.display = this.originalDownDisplay;
}
// Clear visual effects before firing events
this.hideDropPlaceholder();
// fire the order changed event only when dropped if we have a valid drop position
if (
!this.isExternalDrag &&
this.pendingDropIndex >= 0 &&
this.pendingTargetElement
) {
// Use the original drag index we captured before hiding the element
const originalDragIdx = this.originalDragIndex;
// use swap-based logic - report which indexes need to be swapped
const fromIdx = originalDragIdx;
const toIdx = this.pendingDropIndex;
// only fire if the position actually changed AND this is not an external drag
// External drags are handled by external drop handlers
if (fromIdx !== toIdx && !this.isExternalDrag) {
this.fireCustomEvent(CustomEventType.OrderChanged, {
swap: [fromIdx, toIdx]
});
}
}
this.fireCustomEvent(CustomEventType.DragStop, {
id: this.draggingId,
isExternal: this.isExternalDrag,
mouseX: clientX,
mouseY: clientY
});
this.draggingId = null;
this.dropTargetId = null;
this.downEle = null;
this.originalElementRect = null;
this.originalDragIndex = -1;
this.pendingDropIndex = -1;
this.pendingTargetElement = null;
this.pendingInsertAfter = null;
this.isExternalDrag = false;
// Clear the ghost reference since we removed it
this.ghostElement = null;
this.hideDropPlaceholder();
// Keep the click blocker active for a short time after drop
if (this.clickBlocker) {
// We'll clean it up after a timeout
setTimeout(() => {
if (this.clickBlocker) {
document.removeEventListener('click', this.clickBlocker, true);
this.clickBlocker = null;
}
}, 100);
}
}
}
private handleMouseUp(evt: MouseEvent) {
if (this.draggingId && this.ghostElement) {
evt.preventDefault();
evt.stopPropagation();
}
this.processDragEnd(evt.clientX, evt.clientY);
document.removeEventListener('mousemove', this.handleMouseMove);
document.removeEventListener('mouseup', this.handleMouseUp);
this.dispatchEvent(new Event('change'));
}
/* c8 ignore start -- touch-only */
private handleTouchEnd(evt: TouchEvent) {
const touch = evt.changedTouches[0];
const clientX = touch?.clientX ?? 0;
const clientY = touch?.clientY ?? 0;
this.processDragEnd(clientX, clientY);
document.removeEventListener('touchmove', this.handleTouchMove);
document.removeEventListener('touchend', this.handleTouchEnd);
document.removeEventListener('touchcancel', this.handleTouchEnd);
this.dispatchEvent(new Event('change'));
}
/* c8 ignore stop */
/** Show or hide the original element that is being dragged. */
public setOriginalVisible(visible: boolean): void {
if (!this.downEle) return;
this.downEle.style.display = visible ? this.originalDownDisplay : 'none';
}
public render(): TemplateResult {
return html`
<div
class="container ${this.horizontal ? 'horizontal' : ''}"
style="gap: ${this.gap}"
>
<slot
@mousedown=${this.handleMouseDown}
@touchstart=${this.handleTouchStart}
></slot>
</div>
`;
}
}
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