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- const CSS_CLASS_GRAB = "grab-to-pan-grab";
- class GrabToPan {
-
- constructor(options) {
- this.element = options.element;
- this.document = options.element.ownerDocument;
- if (typeof options.ignoreTarget === "function") {
- this.ignoreTarget = options.ignoreTarget;
- }
- this.onActiveChanged = options.onActiveChanged;
-
-
- this.activate = this.activate.bind(this);
- this.deactivate = this.deactivate.bind(this);
- this.toggle = this.toggle.bind(this);
- this._onMouseDown = this.#onMouseDown.bind(this);
- this._onMouseMove = this.#onMouseMove.bind(this);
- this._endPan = this.#endPan.bind(this);
-
-
- const overlay = (this.overlay = document.createElement("div"));
- overlay.className = "grab-to-pan-grabbing";
- }
-
- activate() {
- if (!this.active) {
- this.active = true;
- this.element.addEventListener("mousedown", this._onMouseDown, true);
- this.element.classList.add(CSS_CLASS_GRAB);
- this.onActiveChanged?.(true);
- }
- }
-
- deactivate() {
- if (this.active) {
- this.active = false;
- this.element.removeEventListener("mousedown", this._onMouseDown, true);
- this._endPan();
- this.element.classList.remove(CSS_CLASS_GRAB);
- this.onActiveChanged?.(false);
- }
- }
- toggle() {
- if (this.active) {
- this.deactivate();
- } else {
- this.activate();
- }
- }
-
- ignoreTarget(node) {
-
- return node.matches(
- "a[href], a[href] *, input, textarea, button, button *, select, option"
- );
- }
- #onMouseDown(event) {
- if (event.button !== 0 || this.ignoreTarget(event.target)) {
- return;
- }
- if (event.originalTarget) {
- try {
-
- event.originalTarget.tagName;
- } catch (e) {
-
- return;
- }
- }
- this.scrollLeftStart = this.element.scrollLeft;
- this.scrollTopStart = this.element.scrollTop;
- this.clientXStart = event.clientX;
- this.clientYStart = event.clientY;
- this.document.addEventListener("mousemove", this._onMouseMove, true);
- this.document.addEventListener("mouseup", this._endPan, true);
-
-
-
- this.element.addEventListener("scroll", this._endPan, true);
- event.preventDefault();
- event.stopPropagation();
- const focusedElement = document.activeElement;
- if (focusedElement && !focusedElement.contains(event.target)) {
- focusedElement.blur();
- }
- }
- #onMouseMove(event) {
- this.element.removeEventListener("scroll", this._endPan, true);
- if (!(event.buttons & 1)) {
-
- this._endPan();
- return;
- }
- const xDiff = event.clientX - this.clientXStart;
- const yDiff = event.clientY - this.clientYStart;
- const scrollTop = this.scrollTopStart - yDiff;
- const scrollLeft = this.scrollLeftStart - xDiff;
- if (this.element.scrollTo) {
- this.element.scrollTo({
- top: scrollTop,
- left: scrollLeft,
- behavior: "instant",
- });
- } else {
- this.element.scrollTop = scrollTop;
- this.element.scrollLeft = scrollLeft;
- }
- if (!this.overlay.parentNode) {
- document.body.append(this.overlay);
- }
- }
- #endPan() {
- this.element.removeEventListener("scroll", this._endPan, true);
- this.document.removeEventListener("mousemove", this._onMouseMove, true);
- this.document.removeEventListener("mouseup", this._endPan, true);
-
- this.overlay.remove();
- }
- }
- export { GrabToPan };
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