From 5398c336ef8821d286a60fda593376eed99381a2 Mon Sep 17 00:00:00 2001
From: Allan Wang <me@allanwang.ca>
Date: Wed, 1 May 2019 15:36:32 -0700
Subject: Add better handling for launchpad

---
 app/src/web/ts/click_a.ts | 93 +++++++++++++++++++++++++++++++++++------------
 1 file changed, 70 insertions(+), 23 deletions(-)

(limited to 'app/src/web/ts/click_a.ts')

diff --git a/app/src/web/ts/click_a.ts b/app/src/web/ts/click_a.ts
index 5023610e..8d1d545b 100644
--- a/app/src/web/ts/click_a.ts
+++ b/app/src/web/ts/click_a.ts
@@ -1,34 +1,81 @@
 (function () {
     let prevented = false;
 
+    /**
+     * Go up at most [depth] times, to retrieve a parent matching the provided predicate
+     * If one is found, it is returned immediately.
+     * Otherwise, null is returned.
+     */
+    function _parentEl(el: HTMLElement, depth: number, predicate: (el: HTMLElement) => boolean): HTMLElement | null {
+        for (let i = 0; i < depth + 1; i++) {
+            if (predicate(el)) {
+                return el
+            }
+            const parent = el.parentElement;
+            if (!parent) {
+                return null
+            }
+            el = parent
+        }
+        return null
+    }
+
+    /**
+     * Attempts to find a url entry at most [depth] away
+     * A url is found if the element has tag 'A', and the url isn't blank
+     */
+    function _parentUrl(el: HTMLElement, depth: number): string | null {
+        const element = _parentEl(el, depth, (el) => el.tagName === 'A');
+        if (!element) {
+            return null;
+        }
+        const url = element.getAttribute('href');
+        if (!url || url === '#') {
+            return null;
+        }
+        return url
+    }
+
+    /**
+     * Given event and target, return true if handled and false otherwise.
+     */
+    type EventHandler = (e: Event, target: HTMLElement) => Boolean
+
+    const _frostGeneral: EventHandler = (e, target) => {
+        // Notifications are two layers under
+        const url = _parentUrl(target, 2);
+        return Frost.loadUrl(url);
+    };
+
+    const _frostLaunchpadClick: EventHandler = (e, target) => {
+        if (!_parentEl(target, 6, (el) => el.id === 'launchpad')) {
+            return false
+        }
+        console.log('Clicked launchpad');
+        const url = _parentUrl(target, 5);
+        return Frost.loadUrl(url);
+    };
+
+    const handlers: EventHandler[] = [_frostLaunchpadClick, _frostGeneral];
+
     const _frostAClick = (e: Event) => {
-        // check for valid target
+        if (prevented) {
+            console.log("Click intercept prevented");
+            return
+        }
+        /*
+         * Commonality; check for valid target
+         */
         const target = e.target || e.currentTarget || e.srcElement;
-        if (!(target instanceof Element)) {
+        if (!(target instanceof HTMLElement)) {
             console.log("No element found");
             return
         }
-        let element: Element = target;
-        // Notifications are two layers under
-        for (let i = 0; i < 2; i++) {
-            if (element.tagName !== 'A') {
-                element = <Element>element.parentElement;
-            }
-        }
-        if (element.tagName === 'A') {
-            if (!prevented) {
-                const url = element.getAttribute('href');
-                if (!url || url === '#') {
-                    return
-                }
-                console.log(`Click intercept ${url}`);
-                // If Frost is injected, check if loading the url through an overlay works
-                if (Frost.loadUrl(url)) {
-                    e.stopPropagation();
-                    e.preventDefault();
-                }
-            } else {
-                console.log("Click intercept prevented")
+        for (const h of handlers) {
+            if (h(e, target)) {
+                e.stopPropagation();
+                e.preventDefault();
+                return
             }
         }
     };
-- 
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