87 lines
2.1 KiB
JavaScript
87 lines
2.1 KiB
JavaScript
let register = Toolkit => Toolkit.Desktop =
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// Layered window manager
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class Desktop extends Toolkit.Component {
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//////////////////////////////// Constants ////////////////////////////////
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// Comparator for ordering child windows
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static CHILD_ORDER(a, b) {
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return b.element.style.zIndex - a.element.style.zIndex;
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}
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///////////////////////// Initialization Methods //////////////////////////
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constructor(app, options = {}) {
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super(app, Object.assign({
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class: "tk desktop"
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}, options, { style: Object.assign({
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position: "relative",
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zIndex : "0"
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}, options.style || {})} ));
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// Configure event listeners
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this.addEventListener("resize", e=>this.onResize());
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}
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///////////////////////////// Event Handlers //////////////////////////////
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// Element resized
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onResize() {
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// The element is hidden: its size is indeterminate
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if (!this.isVisible())
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return;
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// Don't allow children to be out-of-frame
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if (this.children != null) {
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for (let child of this.children) {
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child.left = child.left;
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child.top = child.top;
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}
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}
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}
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///////////////////////////// Public Methods //////////////////////////////
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// Add a child component
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add(comp) {
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super.add(comp);
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this.bringToFront(comp);
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}
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// Retrieve the foremost visible window
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getActiveWindow() {
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if (this.children != null) {
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for (let child of this.children) {
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if (child.isVisible())
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return child;
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}
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}
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return null;
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}
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///////////////////////////// Package Methods /////////////////////////////
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// Reorder children so that a particular child is in front
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bringToFront(child) {
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this.children.splice(this.children.indexOf(child), 1);
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this.children.push(child);
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let z = 1 - this.children.length;
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for (let child of this.children)
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child.element.style.zIndex = z++;
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}
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}
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export { register };
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