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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
export const PLATFORM_LINUX = "linux";
export const PLATFORM_MACOS = "macosx";
export const PLATFORM_WINDOWS = "win";
/**
* A grouping of buttons. Primary button order will be set automatically based
* on class="primary", type="submit" or autofocus attribute. Set slot="primary"
* on a primary button that does not have primary styling to set its position.
*
* @tagname moz-button-group
* @property {string} platform - The detected platform, set automatically.
*/
export default class MozButtonGroup extends MozLitElement {
static queries = {
defaultSlotEl: "slot:not([name])",
primarySlotEl: "slot[name=primary]",
};
static properties = {
platform: { state: true },
};
constructor() {
super();
this.#detectPlatform();
}
#detectPlatform() {
if (typeof AppConstants !== "undefined") {
this.platform = AppConstants.platform;
} else if (navigator.platform.includes("Linux")) {
this.platform = PLATFORM_LINUX;
} else if (navigator.platform.includes("Mac")) {
this.platform = PLATFORM_MACOS;
} else {
this.platform = PLATFORM_WINDOWS;
}
}
onSlotchange() {
for (let child of this.defaultSlotEl.assignedNodes()) {
if (!(child instanceof Element)) {
// Text nodes won't support classList or getAttribute.
continue;
}
switch (child.localName) {
case "button":
if (
child.classList.contains("primary") ||
child.getAttribute("type") == "submit" ||
child.hasAttribute("autofocus") ||
child.hasAttribute("default")
) {
child.slot = "primary";
}
break;
case "moz-button":
if (child.type == "primary" || child.type == "destructive") {
child.slot = "primary";
}
break;
}
}
this.#reorderLightDom();
}
#reorderLightDom() {
let primarySlottedChildren = [...this.primarySlotEl.assignedNodes()];
if (this.platform == PLATFORM_WINDOWS) {
primarySlottedChildren.reverse();
for (let child of primarySlottedChildren) {
child.parentElement.prepend(child);
}
} else {
for (let child of primarySlottedChildren) {
// Ensure the primary buttons are at the end of the light DOM.
child.parentElement.append(child);
}
}
}
updated(changedProperties) {
if (changedProperties.has("platform")) {
this.#reorderLightDom();
}
}
render() {
let slots = [
html` <slot @slotchange=${this.onSlotchange}></slot> `,
html` <slot name="primary"></slot> `,
];
if (this.platform == PLATFORM_WINDOWS) {
slots = [slots[1], slots[0]];
}
return html`
<link
rel="stylesheet"
/>
${slots}
`;
}
}
customElements.define("moz-button-group", MozButtonGroup);