83 lines
1.9 KiB
JavaScript
83 lines
1.9 KiB
JavaScript
/**
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* The highlighter can highlight/unhighlight a node, and
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* animate the visibility of a context menu.
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* @constructor Highlighter
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*/
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function Highlighter () {
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this.locked = false;
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}
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/**
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* Hightlight given node and its childs
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* @param {Node} node
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*/
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Highlighter.prototype.highlight = function (node) {
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if (this.locked) {
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return;
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}
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if (this.node != node) {
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// unhighlight current node
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if (this.node) {
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this.node.setHighlight(false);
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}
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// highlight new node
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this.node = node;
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this.node.setHighlight(true);
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}
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// cancel any current timeout
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this._cancelUnhighlight();
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};
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/**
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* Unhighlight currently highlighted node.
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* Will be done after a delay
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*/
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Highlighter.prototype.unhighlight = function () {
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if (this.locked) {
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return;
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}
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var me = this;
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if (this.node) {
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this._cancelUnhighlight();
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// do the unhighlighting after a small delay, to prevent re-highlighting
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// the same node when moving from the drag-icon to the contextmenu-icon
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// or vice versa.
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this.unhighlightTimer = setTimeout(function () {
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me.node.setHighlight(false);
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me.node = undefined;
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me.unhighlightTimer = undefined;
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}, 0);
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}
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};
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/**
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* Cancel an unhighlight action (if before the timeout of the unhighlight action)
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* @private
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*/
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Highlighter.prototype._cancelUnhighlight = function () {
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if (this.unhighlightTimer) {
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clearTimeout(this.unhighlightTimer);
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this.unhighlightTimer = undefined;
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}
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};
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/**
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* Lock highlighting or unhighlighting nodes.
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* methods highlight and unhighlight do not work while locked.
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*/
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Highlighter.prototype.lock = function () {
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this.locked = true;
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};
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/**
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* Unlock highlighting or unhighlighting nodes
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*/
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Highlighter.prototype.unlock = function () {
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this.locked = false;
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};
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