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announce/js/script.js

@@ -0,0 +1,211 @@
+"use strict";
+
+window.AllowBackFromHistory = false;
+function CheckLocation() {
+    var start = "#go_to_message";
+    var hash = location.hash;
+    if (hash.substr(0, start.length) == start) {
+        var messageId = parseInt(hash.substr(start.length));
+        if (messageId) {
+            GoToMessage(messageId);
+        }
+    } else if (hash == "#allow_back") {
+        window.AllowBackFromHistory = true;
+    }
+}
+
+function ShowToast(text) {
+    var container = document.createElement("div");
+    container.className = "toast_container";
+    var inner = container.appendChild(document.createElement("div"));
+    inner.className = "toast_body";
+    inner.appendChild(document.createTextNode(text));
+    var appended = document.body.appendChild(container);
+    setTimeout(function () {
+        AddClass(appended, "toast_shown");
+        setTimeout(function () {
+            RemoveClass(appended, "toast_shown");
+            setTimeout(function () {
+                document.body.removeChild(appended);
+            }, 3000);
+        }, 3000);
+    }, 0);
+}
+
+function ShowHashtag(tag) {
+    ShowToast("This is a hashtag '#" + tag + "' link.");
+    return false;
+}
+
+function ShowCashtag(tag) {
+    ShowToast("This is a cashtag '$" + tag + "' link.");
+    return false;
+}
+
+function ShowBotCommand(command) {
+    ShowToast("This is a bot command '/" + command + "' link.");
+    return false;
+}
+
+function ShowMentionName() {
+    ShowToast("This is a link to a user mentioned by name.");
+    return false;
+}
+
+function ShowNotLoadedEmoji() {
+    ShowToast("This custom emoji is not included, change data exporting settings to download.");
+    return false;
+}
+
+function ShowNotAvailableEmoji() {
+    ShowToast("This custom emoji is not available.");
+    return false;
+}
+
+function ShowTextCopied(content) {
+    navigator.clipboard.writeText(content);
+    ShowToast("Text copied to clipboard.");
+    return false;
+}
+
+function ShowSpoiler(target) {
+    if (target.classList.contains("hidden")) {
+        target.classList.toggle("hidden");
+    }
+}
+
+function AddClass(element, name) {
+    var current = element.className;
+    var expression = new RegExp('(^|\\s)' + name + '(\\s|$)', 'g');
+    if (expression.test(current)) {
+        return;
+    }
+    element.className = current + ' ' + name;
+}
+
+function RemoveClass(element, name) {
+    var current = element.className;
+    var expression = new RegExp('(^|\\s)' + name + '(\\s|$)', '');
+    var match = expression.exec(current);
+    while ((match = expression.exec(current)) != null) {
+        if (match[1].length > 0 && match[2].length > 0) {
+            current = current.substr(0, match.index + match[1].length)
+                + current.substr(match.index + match[0].length);
+        } else {
+            current = current.substr(0, match.index)
+                + current.substr(match.index + match[0].length);
+        }
+    }
+    element.className = current;
+}
+
+function EaseOutQuad(t) {
+    return t * t;
+}
+
+function EaseInOutQuad(t) {
+    return (t < 0.5) ? (2 * t * t) : ((4 - 2 * t) * t - 1);
+}
+
+function ScrollHeight() {
+    if ("innerHeight" in window) {
+        return window.innerHeight;
+    } else if (document.documentElement) {
+        return document.documentElement.clientHeight;
+    }
+    return document.body.clientHeight;
+}
+
+function ScrollTo(top, callback) {
+    var html = document.documentElement;
+    var current = html.scrollTop;
+    var delta = top - current;
+    var finish = function () {
+        html.scrollTop = top;
+        if (callback) {
+            callback();
+        }
+    };
+    if (!window.performance.now || delta == 0) {
+        finish();
+        return;
+    }
+    var transition = EaseOutQuad;
+    var max = 300;
+    if (delta < -max) {
+        current = top + max;
+        delta = -max;
+    } else if (delta > max) {
+        current = top - max;
+        delta = max;
+    } else {
+        transition = EaseInOutQuad;
+    }
+    var duration = 150;
+    var interval = 7;
+    var time = window.performance.now();
+    var animate = function () {
+        var now = window.performance.now();
+        if (now >= time + duration) {
+            finish();
+            return;
+        }
+        var dt = (now - time) / duration;
+        html.scrollTop = Math.round(current + delta * transition(dt));
+        setTimeout(animate, interval);
+    };
+    setTimeout(animate, interval);
+}
+
+function ScrollToElement(element, callback) {
+    var header = document.getElementsByClassName("page_header")[0];
+    var headerHeight = header.offsetHeight;
+    var html = document.documentElement;
+    var scrollHeight = ScrollHeight();
+    var available = scrollHeight - headerHeight;
+    var padding = 10;
+    var top = element.offsetTop;
+    var height = element.offsetHeight;
+    var desired = top
+        - Math.max((available - height) / 2, padding)
+        - headerHeight;
+    var scrollTopMax = html.offsetHeight - scrollHeight;
+    ScrollTo(Math.min(desired, scrollTopMax), callback);
+}
+
+function GoToMessage(messageId) {
+    var element = document.getElementById("message" + messageId);
+    if (element) {
+        var hash = "#go_to_message" + messageId;
+        if (location.hash != hash) {
+            location.hash = hash;
+        }
+        ScrollToElement(element, function () {
+            AddClass(element, "selected");
+            setTimeout(function () {
+                RemoveClass(element, "selected");
+            }, 1000);
+        });
+    } else {
+        ShowToast("This message was not exported. Maybe it was deleted.");
+    }
+    return false;
+}
+
+function GoBack(anchor) {
+    if (!window.AllowBackFromHistory) {
+        return true;
+    }
+    history.back();
+    if (!anchor || !anchor.getAttribute) {
+        return true;
+    }
+    var destination = anchor.getAttribute("href");
+    if (!destination) {
+        return true;
+    }
+    setTimeout(function () {
+        location.href = destination;
+    }, 100);
+    return false;
+}