import Parchment from 'parchment';
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import TextBlot from './text';
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class Cursor extends Parchment.Embed {
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static value() {
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return undefined;
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}
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constructor(domNode, selection) {
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super(domNode);
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this.selection = selection;
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this.textNode = document.createTextNode(Cursor.CONTENTS);
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this.domNode.appendChild(this.textNode);
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this._length = 0;
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}
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detach() {
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// super.detach() will also clear domNode.__blot
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if (this.parent != null) this.parent.removeChild(this);
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}
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format(name, value) {
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if (this._length !== 0) {
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return super.format(name, value);
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}
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let target = this, index = 0;
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while (target != null && target.statics.scope !== Parchment.Scope.BLOCK_BLOT) {
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index += target.offset(target.parent);
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target = target.parent;
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}
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if (target != null) {
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this._length = Cursor.CONTENTS.length;
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target.optimize();
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target.formatAt(index, Cursor.CONTENTS.length, name, value);
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this._length = 0;
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}
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}
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index(node, offset) {
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if (node === this.textNode) return 0;
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return super.index(node, offset);
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}
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length() {
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return this._length;
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}
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position() {
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return [this.textNode, this.textNode.data.length];
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}
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remove() {
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super.remove();
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this.parent = null;
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}
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restore() {
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if (this.selection.composing || this.parent == null) return;
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let textNode = this.textNode;
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let range = this.selection.getNativeRange();
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let restoreText, start, end;
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if (range != null && range.start.node === textNode && range.end.node === textNode) {
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[restoreText, start, end] = [textNode, range.start.offset, range.end.offset];
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}
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// Link format will insert text outside of anchor tag
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while (this.domNode.lastChild != null && this.domNode.lastChild !== this.textNode) {
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this.domNode.parentNode.insertBefore(this.domNode.lastChild, this.domNode);
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}
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if (this.textNode.data !== Cursor.CONTENTS) {
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let text = this.textNode.data.split(Cursor.CONTENTS).join('');
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if (this.next instanceof TextBlot) {
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restoreText = this.next.domNode;
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this.next.insertAt(0, text);
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this.textNode.data = Cursor.CONTENTS;
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} else {
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this.textNode.data = text;
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this.parent.insertBefore(Parchment.create(this.textNode), this);
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this.textNode = document.createTextNode(Cursor.CONTENTS);
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this.domNode.appendChild(this.textNode);
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}
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}
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this.remove();
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if (start != null) {
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[start, end] = [start, end].map(function(offset) {
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return Math.max(0, Math.min(restoreText.data.length, offset - 1));
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});
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return {
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startNode: restoreText,
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startOffset: start,
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endNode: restoreText,
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endOffset: end
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};
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}
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}
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update(mutations, context) {
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if (mutations.some((mutation) => {
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return mutation.type === 'characterData' && mutation.target === this.textNode;
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})) {
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let range = this.restore();
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if (range) context.range = range;
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}
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}
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value() {
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return '';
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}
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}
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Cursor.blotName = 'cursor';
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Cursor.className = 'ql-cursor';
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Cursor.tagName = 'span';
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Cursor.CONTENTS = "\uFEFF"; // Zero width no break space
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export default Cursor;
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