source: trip-planner-front/node_modules/@angular/cdk/drag-drop/drag-ref.d.ts@ fa375fe

Last change on this file since fa375fe was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

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1/**
2 * @license
3 * Copyright Google LLC All Rights Reserved.
4 *
5 * Use of this source code is governed by an MIT-style license that can be
6 * found in the LICENSE file at https://angular.io/license
7 */
8import { ElementRef, NgZone, ViewContainerRef, TemplateRef } from '@angular/core';
9import { ViewportRuler } from '@angular/cdk/scrolling';
10import { Direction } from '@angular/cdk/bidi';
11import { Subject, Observable } from 'rxjs';
12import { DropListRefInternal as DropListRef } from './drop-list-ref';
13import { DragDropRegistry } from './drag-drop-registry';
14/** Object that can be used to configure the behavior of DragRef. */
15export interface DragRefConfig {
16 /**
17 * Minimum amount of pixels that the user should
18 * drag, before the CDK initiates a drag sequence.
19 */
20 dragStartThreshold: number;
21 /**
22 * Amount the pixels the user should drag before the CDK
23 * considers them to have changed the drag direction.
24 */
25 pointerDirectionChangeThreshold: number;
26 /** `z-index` for the absolutely-positioned elements that are created by the drag item. */
27 zIndex?: number;
28 /** Ref that the current drag item is nested in. */
29 parentDragRef?: DragRef;
30}
31/**
32 * Internal compile-time-only representation of a `DragRef`.
33 * Used to avoid circular import issues between the `DragRef` and the `DropListRef`.
34 * @docs-private
35 */
36export interface DragRefInternal extends DragRef {
37}
38/** Template that can be used to create a drag helper element (e.g. a preview or a placeholder). */
39interface DragHelperTemplate<T = any> {
40 template: TemplateRef<T> | null;
41 viewContainer: ViewContainerRef;
42 context: T;
43}
44/** Template that can be used to create a drag preview element. */
45interface DragPreviewTemplate<T = any> extends DragHelperTemplate<T> {
46 matchSize?: boolean;
47}
48/** Point on the page or within an element. */
49export interface Point {
50 x: number;
51 y: number;
52}
53/**
54 * Possible places into which the preview of a drag item can be inserted.
55 * - `global` - Preview will be inserted at the bottom of the `<body>`. The advantage is that
56 * you don't have to worry about `overflow: hidden` or `z-index`, but the item won't retain
57 * its inherited styles.
58 * - `parent` - Preview will be inserted into the parent of the drag item. The advantage is that
59 * inherited styles will be preserved, but it may be clipped by `overflow: hidden` or not be
60 * visible due to `z-index`. Furthermore, the preview is going to have an effect over selectors
61 * like `:nth-child` and some flexbox configurations.
62 * - `ElementRef<HTMLElement> | HTMLElement` - Preview will be inserted into a specific element.
63 * Same advantages and disadvantages as `parent`.
64 */
65export declare type PreviewContainer = 'global' | 'parent' | ElementRef<HTMLElement> | HTMLElement;
66/**
67 * Reference to a draggable item. Used to manipulate or dispose of the item.
68 */
69export declare class DragRef<T = any> {
70 private _config;
71 private _document;
72 private _ngZone;
73 private _viewportRuler;
74 private _dragDropRegistry;
75 /** Element displayed next to the user's pointer while the element is dragged. */
76 private _preview;
77 /** Reference to the view of the preview element. */
78 private _previewRef;
79 /** Container into which to insert the preview. */
80 private _previewContainer;
81 /** Reference to the view of the placeholder element. */
82 private _placeholderRef;
83 /** Element that is rendered instead of the draggable item while it is being sorted. */
84 private _placeholder;
85 /** Coordinates within the element at which the user picked up the element. */
86 private _pickupPositionInElement;
87 /** Coordinates on the page at which the user picked up the element. */
88 private _pickupPositionOnPage;
89 /**
90 * Anchor node used to save the place in the DOM where the element was
91 * picked up so that it can be restored at the end of the drag sequence.
92 */
93 private _anchor;
94 /**
95 * CSS `transform` applied to the element when it isn't being dragged. We need a
96 * passive transform in order for the dragged element to retain its new position
97 * after the user has stopped dragging and because we need to know the relative
98 * position in case they start dragging again. This corresponds to `element.style.transform`.
99 */
100 private _passiveTransform;
101 /** CSS `transform` that is applied to the element while it's being dragged. */
102 private _activeTransform;
103 /** Inline `transform` value that the element had before the first dragging sequence. */
104 private _initialTransform?;
105 /**
106 * Whether the dragging sequence has been started. Doesn't
107 * necessarily mean that the element has been moved.
108 */
109 private _hasStartedDragging;
110 /** Whether the element has moved since the user started dragging it. */
111 private _hasMoved;
112 /** Drop container in which the DragRef resided when dragging began. */
113 private _initialContainer;
114 /** Index at which the item started in its initial container. */
115 private _initialIndex;
116 /** Cached positions of scrollable parent elements. */
117 private _parentPositions;
118 /** Emits when the item is being moved. */
119 private readonly _moveEvents;
120 /** Keeps track of the direction in which the user is dragging along each axis. */
121 private _pointerDirectionDelta;
122 /** Pointer position at which the last change in the delta occurred. */
123 private _pointerPositionAtLastDirectionChange;
124 /** Position of the pointer at the last pointer event. */
125 private _lastKnownPointerPosition;
126 /**
127 * Root DOM node of the drag instance. This is the element that will
128 * be moved around as the user is dragging.
129 */
130 private _rootElement;
131 /**
132 * Nearest ancestor SVG, relative to which coordinates are calculated if dragging SVGElement
133 */
134 private _ownerSVGElement;
135 /**
136 * Inline style value of `-webkit-tap-highlight-color` at the time the
137 * dragging was started. Used to restore the value once we're done dragging.
138 */
139 private _rootElementTapHighlight;
140 /** Subscription to pointer movement events. */
141 private _pointerMoveSubscription;
142 /** Subscription to the event that is dispatched when the user lifts their pointer. */
143 private _pointerUpSubscription;
144 /** Subscription to the viewport being scrolled. */
145 private _scrollSubscription;
146 /** Subscription to the viewport being resized. */
147 private _resizeSubscription;
148 /**
149 * Time at which the last touch event occurred. Used to avoid firing the same
150 * events multiple times on touch devices where the browser will fire a fake
151 * mouse event for each touch event, after a certain time.
152 */
153 private _lastTouchEventTime;
154 /** Time at which the last dragging sequence was started. */
155 private _dragStartTime;
156 /** Cached reference to the boundary element. */
157 private _boundaryElement;
158 /** Whether the native dragging interactions have been enabled on the root element. */
159 private _nativeInteractionsEnabled;
160 /** Cached dimensions of the preview element. */
161 private _previewRect?;
162 /** Cached dimensions of the boundary element. */
163 private _boundaryRect?;
164 /** Element that will be used as a template to create the draggable item's preview. */
165 private _previewTemplate?;
166 /** Template for placeholder element rendered to show where a draggable would be dropped. */
167 private _placeholderTemplate?;
168 /** Elements that can be used to drag the draggable item. */
169 private _handles;
170 /** Registered handles that are currently disabled. */
171 private _disabledHandles;
172 /** Droppable container that the draggable is a part of. */
173 private _dropContainer?;
174 /** Layout direction of the item. */
175 private _direction;
176 /** Ref that the current drag item is nested in. */
177 private _parentDragRef;
178 /**
179 * Cached shadow root that the element is placed in. `null` means that the element isn't in
180 * the shadow DOM and `undefined` means that it hasn't been resolved yet. Should be read via
181 * `_getShadowRoot`, not directly.
182 */
183 private _cachedShadowRoot;
184 /** Axis along which dragging is locked. */
185 lockAxis: 'x' | 'y';
186 /**
187 * Amount of milliseconds to wait after the user has put their
188 * pointer down before starting to drag the element.
189 */
190 dragStartDelay: number | {
191 touch: number;
192 mouse: number;
193 };
194 /** Class to be added to the preview element. */
195 previewClass: string | string[] | undefined;
196 /** Whether starting to drag this element is disabled. */
197 get disabled(): boolean;
198 set disabled(value: boolean);
199 private _disabled;
200 /** Emits as the drag sequence is being prepared. */
201 readonly beforeStarted: Subject<void>;
202 /** Emits when the user starts dragging the item. */
203 readonly started: Subject<{
204 source: DragRef;
205 }>;
206 /** Emits when the user has released a drag item, before any animations have started. */
207 readonly released: Subject<{
208 source: DragRef;
209 }>;
210 /** Emits when the user stops dragging an item in the container. */
211 readonly ended: Subject<{
212 source: DragRef;
213 distance: Point;
214 dropPoint: Point;
215 }>;
216 /** Emits when the user has moved the item into a new container. */
217 readonly entered: Subject<{
218 container: DropListRef;
219 item: DragRef;
220 currentIndex: number;
221 }>;
222 /** Emits when the user removes the item its container by dragging it into another container. */
223 readonly exited: Subject<{
224 container: DropListRef;
225 item: DragRef;
226 }>;
227 /** Emits when the user drops the item inside a container. */
228 readonly dropped: Subject<{
229 previousIndex: number;
230 currentIndex: number;
231 item: DragRef;
232 container: DropListRef;
233 previousContainer: DropListRef;
234 distance: Point;
235 dropPoint: Point;
236 isPointerOverContainer: boolean;
237 }>;
238 /**
239 * Emits as the user is dragging the item. Use with caution,
240 * because this event will fire for every pixel that the user has dragged.
241 */
242 readonly moved: Observable<{
243 source: DragRef;
244 pointerPosition: {
245 x: number;
246 y: number;
247 };
248 event: MouseEvent | TouchEvent;
249 distance: Point;
250 delta: {
251 x: -1 | 0 | 1;
252 y: -1 | 0 | 1;
253 };
254 }>;
255 /** Arbitrary data that can be attached to the drag item. */
256 data: T;
257 /**
258 * Function that can be used to customize the logic of how the position of the drag item
259 * is limited while it's being dragged. Gets called with a point containing the current position
260 * of the user's pointer on the page and should return a point describing where the item should
261 * be rendered.
262 */
263 constrainPosition?: (point: Point, dragRef: DragRef) => Point;
264 constructor(element: ElementRef<HTMLElement> | HTMLElement, _config: DragRefConfig, _document: Document, _ngZone: NgZone, _viewportRuler: ViewportRuler, _dragDropRegistry: DragDropRegistry<DragRef, DropListRef>);
265 /**
266 * Returns the element that is being used as a placeholder
267 * while the current element is being dragged.
268 */
269 getPlaceholderElement(): HTMLElement;
270 /** Returns the root draggable element. */
271 getRootElement(): HTMLElement;
272 /**
273 * Gets the currently-visible element that represents the drag item.
274 * While dragging this is the placeholder, otherwise it's the root element.
275 */
276 getVisibleElement(): HTMLElement;
277 /** Registers the handles that can be used to drag the element. */
278 withHandles(handles: (HTMLElement | ElementRef<HTMLElement>)[]): this;
279 /**
280 * Registers the template that should be used for the drag preview.
281 * @param template Template that from which to stamp out the preview.
282 */
283 withPreviewTemplate(template: DragPreviewTemplate | null): this;
284 /**
285 * Registers the template that should be used for the drag placeholder.
286 * @param template Template that from which to stamp out the placeholder.
287 */
288 withPlaceholderTemplate(template: DragHelperTemplate | null): this;
289 /**
290 * Sets an alternate drag root element. The root element is the element that will be moved as
291 * the user is dragging. Passing an alternate root element is useful when trying to enable
292 * dragging on an element that you might not have access to.
293 */
294 withRootElement(rootElement: ElementRef<HTMLElement> | HTMLElement): this;
295 /**
296 * Element to which the draggable's position will be constrained.
297 */
298 withBoundaryElement(boundaryElement: ElementRef<HTMLElement> | HTMLElement | null): this;
299 /** Sets the parent ref that the ref is nested in. */
300 withParent(parent: DragRef<unknown> | null): this;
301 /** Removes the dragging functionality from the DOM element. */
302 dispose(): void;
303 /** Checks whether the element is currently being dragged. */
304 isDragging(): boolean;
305 /** Resets a standalone drag item to its initial position. */
306 reset(): void;
307 /**
308 * Sets a handle as disabled. While a handle is disabled, it'll capture and interrupt dragging.
309 * @param handle Handle element that should be disabled.
310 */
311 disableHandle(handle: HTMLElement): void;
312 /**
313 * Enables a handle, if it has been disabled.
314 * @param handle Handle element to be enabled.
315 */
316 enableHandle(handle: HTMLElement): void;
317 /** Sets the layout direction of the draggable item. */
318 withDirection(direction: Direction): this;
319 /** Sets the container that the item is part of. */
320 _withDropContainer(container: DropListRef): void;
321 /**
322 * Gets the current position in pixels the draggable outside of a drop container.
323 */
324 getFreeDragPosition(): Readonly<Point>;
325 /**
326 * Sets the current position in pixels the draggable outside of a drop container.
327 * @param value New position to be set.
328 */
329 setFreeDragPosition(value: Point): this;
330 /**
331 * Sets the container into which to insert the preview element.
332 * @param value Container into which to insert the preview.
333 */
334 withPreviewContainer(value: PreviewContainer): this;
335 /** Updates the item's sort order based on the last-known pointer position. */
336 _sortFromLastPointerPosition(): void;
337 /** Unsubscribes from the global subscriptions. */
338 private _removeSubscriptions;
339 /** Destroys the preview element and its ViewRef. */
340 private _destroyPreview;
341 /** Destroys the placeholder element and its ViewRef. */
342 private _destroyPlaceholder;
343 /** Handler for the `mousedown`/`touchstart` events. */
344 private _pointerDown;
345 /** Handler that is invoked when the user moves their pointer after they've initiated a drag. */
346 private _pointerMove;
347 /** Handler that is invoked when the user lifts their pointer up, after initiating a drag. */
348 private _pointerUp;
349 /**
350 * Clears subscriptions and stops the dragging sequence.
351 * @param event Browser event object that ended the sequence.
352 */
353 private _endDragSequence;
354 /** Starts the dragging sequence. */
355 private _startDragSequence;
356 /**
357 * Sets up the different variables and subscriptions
358 * that will be necessary for the dragging sequence.
359 * @param referenceElement Element that started the drag sequence.
360 * @param event Browser event object that started the sequence.
361 */
362 private _initializeDragSequence;
363 /** Cleans up the DOM artifacts that were added to facilitate the element being dragged. */
364 private _cleanupDragArtifacts;
365 /**
366 * Updates the item's position in its drop container, or moves it
367 * into a new one, depending on its current drag position.
368 */
369 private _updateActiveDropContainer;
370 /**
371 * Creates the element that will be rendered next to the user's pointer
372 * and will be used as a preview of the element that is being dragged.
373 */
374 private _createPreviewElement;
375 /**
376 * Animates the preview element from its current position to the location of the drop placeholder.
377 * @returns Promise that resolves when the animation completes.
378 */
379 private _animatePreviewToPlaceholder;
380 /** Creates an element that will be shown instead of the current element while dragging. */
381 private _createPlaceholderElement;
382 /**
383 * Figures out the coordinates at which an element was picked up.
384 * @param referenceElement Element that initiated the dragging.
385 * @param event Event that initiated the dragging.
386 */
387 private _getPointerPositionInElement;
388 /** Determines the point of the page that was touched by the user. */
389 private _getPointerPositionOnPage;
390 /** Gets the pointer position on the page, accounting for any position constraints. */
391 private _getConstrainedPointerPosition;
392 /** Updates the current drag delta, based on the user's current pointer position on the page. */
393 private _updatePointerDirectionDelta;
394 /** Toggles the native drag interactions, based on how many handles are registered. */
395 private _toggleNativeDragInteractions;
396 /** Removes the manually-added event listeners from the root element. */
397 private _removeRootElementListeners;
398 /**
399 * Applies a `transform` to the root element, taking into account any existing transforms on it.
400 * @param x New transform value along the X axis.
401 * @param y New transform value along the Y axis.
402 */
403 private _applyRootElementTransform;
404 /**
405 * Applies a `transform` to the preview, taking into account any existing transforms on it.
406 * @param x New transform value along the X axis.
407 * @param y New transform value along the Y axis.
408 */
409 private _applyPreviewTransform;
410 /**
411 * Gets the distance that the user has dragged during the current drag sequence.
412 * @param currentPosition Current position of the user's pointer.
413 */
414 private _getDragDistance;
415 /** Cleans up any cached element dimensions that we don't need after dragging has stopped. */
416 private _cleanupCachedDimensions;
417 /**
418 * Checks whether the element is still inside its boundary after the viewport has been resized.
419 * If not, the position is adjusted so that the element fits again.
420 */
421 private _containInsideBoundaryOnResize;
422 /** Gets the drag start delay, based on the event type. */
423 private _getDragStartDelay;
424 /** Updates the internal state of the draggable element when scrolling has occurred. */
425 private _updateOnScroll;
426 /** Gets the scroll position of the viewport. */
427 private _getViewportScrollPosition;
428 /**
429 * Lazily resolves and returns the shadow root of the element. We do this in a function, rather
430 * than saving it in property directly on init, because we want to resolve it as late as possible
431 * in order to ensure that the element has been moved into the shadow DOM. Doing it inside the
432 * constructor might be too early if the element is inside of something like `ngFor` or `ngIf`.
433 */
434 private _getShadowRoot;
435 /** Gets the element into which the drag preview should be inserted. */
436 private _getPreviewInsertionPoint;
437}
438export {};
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