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tabThumbnailTooltip.uc.js
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tabThumbnailTooltip.uc.js
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// ==UserScript==
// @name Tab Thumbnail Tooltip
// @version 1.0.4
// @author aminomancer
// @homepage https://github.com/aminomancer/uc.css.js
// @description Show a large thumbnail image to preview tab content when hovering a tab.
// @license This Source Code Form is subject to the terms of the Creative Commons Attribution-NonCommercial-ShareAlike International License, v. 4.0. If a copy of the CC BY-NC-SA 4.0 was not distributed with this file, You can obtain one at http://creativecommons.org/licenses/by-nc-sa/4.0/ or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
// ==/UserScript==
class TabThumbnail {
static config = {
// Thumbnail width, in pixels (can override with CSS too)
"Preview width": 320,
// Thumbnail height
"Preview height": 180,
// How often to refresh the thumbnail, in milliseconds
"Update interval": 30,
// Set an upper limit on the number of characters shown in the tooltip's
// label when a thumbnail is showing. If a tab has an extremely long
// title (say you searched a really long string on Google), it may wind
// up wrapping onto many lines in the tooltip. This can be mitigated by
// setting a character limit. If the limit is 100, then the first 50
// characters and the last 49 characters will be shown, and … will be
// shown in between. For example, a limit of 30 will yield:
// "Lorem ipsum dol…id est laborum". When a preview thumbnail is not
// showing (e.g. for unloaded tabs), this setting will be ignored. If
// you set this to 0 or -1, there will be no limit at all.
"Max label character limit": 100,
// The character(s) to be shown in the middle of the label if it
// overflows the limit set above. If the character limit above is set to
// 0 or -1, this setting will have no effect. Wrap in backticks `
"Overflow terminal character": `…`,
};
get tooltip() {
return this._tooltip || (this._tooltip = document.getElementById("tabThumbTooltip"));
}
get tabLabel() {
return this._tabLabel || (this._tabLabel = this.tooltip.querySelector("#tabThumbLabel"));
}
get thumbBox() {
return this._thumbBox || (this._thumbBox = this.tooltip.querySelector("#tabThumbBox"));
}
constructor() {
this._updateTimer = null;
this.config = TabThumbnail.config;
const markup =
/* html */
`<tooltip
id="tabThumbTooltip"
noautohide="true"
orient="vertical"
onpopupshowing="ucTabThumbnail.onPopupShowing();"
onpopuphiding="ucTabThumbnail.onPopupHiding();"
hide-thumbnail="true"
style="visibility: collapse;">
<vbox id ="tabThumbBox">
<description id="tabThumbLabel" class="tooltip-label"/>
<toolbarseparator />
<html:div id="tabThumbCanvas"></html:div>
</vbox>
</tooltip>`;
this.registerSheet();
document
.getElementById("mainPopupSet")
.appendChild(MozXULElement.parseXULToFragment(markup));
gBrowser.tabContainer.tooltip = "tabThumbTooltip";
addEventListener("unload", () => this.cancelTimer(), false);
}
async onPopupShowing() {
let ready = await this.showPreview();
if (ready) {
this.tooltip.style.removeProperty("visibility");
}
return ready;
}
onPopupHiding() {
this.tooltip.style.setProperty("visibility", "collapse");
this.cancelTimer();
}
async showPreview(update) {
let tab = this.tooltip.triggerNode?.closest(".tabbrowser-tab");
if (!tab) return false;
if (!update) {
this.tooltip.setAttribute("position", "after_start");
this.tooltip.moveToAnchor(tab, "after_start");
}
const { config } = this;
let label = gBrowser.getTabTooltip(tab);
let canvas = PageThumbs.createCanvas(window);
let browser = tab.linkedBrowser;
let pending = tab.hasAttribute("pending") || !browser.browsingContext;
let docURI = pending ? browser?.currentURI : browser?.documentURI || browser?.currentURI;
let url = docURI?.spec;
let isBlank = !url || url === "about:blank";
if (isBlank || pending) {
this.tabLabel.textContent = label;
this.tooltip.setAttribute("hide-thumbnail", "true");
} else {
let limit = config["Max label character limit"];
if (limit > 0 && label.length > limit) {
let terminal = config["Overflow terminal character"] || "…";
label =
label.substring(0, limit / 2) + // 50
terminal + // 1
label.substring(label.length + terminal.length - limit / 2, label.length); // 49
}
this.tabLabel.textContent = label;
await PageThumbs.captureToCanvas(
browser,
canvas,
{
backgroundColor: getComputedStyle(this.thumbBox).getPropertyValue(
"background-color"
),
fullScale: true,
fullViewport: true,
},
true
);
document.mozSetImageElement("tabThumbImageCanvas", canvas);
this.tooltip.removeAttribute("hide-thumbnail");
}
if (config["Update interval"] > 0) {
this._updateTimer = setTimeout(
() =>
requestIdleCallback(() => requestAnimationFrame(() => this.showPreview(true))),
config["Update interval"]
);
}
return true;
}
cancelTimer() {
if (this._updateTimer) {
clearTimeout(this._updateTimer);
this._updateTimer = null;
}
}
registerSheet() {
const { config } = this;
const css =
/* css */
`#tabThumbTooltip {
--tab-thumb-shadow-size: 6px;
--thumb-border-radius: calc(var(--arrowpanel-border-radius, 7px) - 3px);
appearance: none;
background: transparent;
border: none;
padding: var(--tab-thumb-shadow-size);
}
#tabThumbTooltip[position] {
margin-inline-start: calc(-1 * var(--tab-thumb-shadow-size));
margin-block-start: calc(-1 * var(--tab-thumb-shadow-size));
}
#tabThumbBox {
padding: 5px;
background: var(--arrowpanel-background);
color: var(--arrowpanel-color);
border: 1px solid transparent;
border-radius: var(--arrowpanel-border-radius);
box-shadow: 0 2px var(--tab-thumb-shadow-size) rgba(58,57,68,.2);
}
#tabThumbTooltip[hide-thumbnail] #tabThumbBox {
border-radius: max(3px, var(--thumb-border-radius));
}
#tabThumbLabel {
margin-inline: 5px;
font-weight: 600;
}
#tabThumbTooltip:not([hide-thumbnail]) #tabThumbLabel {
text-align: center;
}
#tabThumbBox > toolbarseparator {
appearance: none;
min-height: 0;
border-top: 1px solid var(--panel-separator-color);
border-bottom: none;
margin: var(--panel-separator-margin);
margin-inline: 0;
padding: 0;
}
#tabThumbCanvas {
border-radius: max(3px, var(--thumb-border-radius));
border: 1px solid var(--arrowpanel-border-color);
width: ${config["Preview width"]}px;
height: ${config["Preview height"]}px;
max-width: ${config["Preview width"]}px;
max-height: ${config["Preview height"]}px;
background-image: -moz-element(#tabThumbImageCanvas);
background-repeat: no-repeat;
background-size: cover;
}
#tabThumbTooltip[hide-thumbnail] #tabThumbCanvas,
#tabThumbTooltip[hide-thumbnail] #tabThumbBox > toolbarseparator {
display: none;
}`;
let sss = Cc["@mozilla.org/content/style-sheet-service;1"].getService(
Ci.nsIStyleSheetService
);
let uri = makeURI("data:text/css;charset=UTF=8," + encodeURIComponent(css));
if (sss.sheetRegistered(uri, sss.AUTHOR_SHEET)) return;
sss.loadAndRegisterSheet(uri, sss.AUTHOR_SHEET);
}
}
if (gBrowserInit.delayedStartupFinished) window.ucTabThumbnail = new TabThumbnail();
else {
let delayedListener = (subject, topic) => {
if (topic == "browser-delayed-startup-finished" && subject == window) {
Services.obs.removeObserver(delayedListener, topic);
window.ucTabThumbnail = new TabThumbnail();
}
};
Services.obs.addObserver(delayedListener, "browser-delayed-startup-finished");
}