From 16552790069070c6a5435f37523173b1be6a4652 Mon Sep 17 00:00:00 2001
From: Marcin Aman <marcin.aman@gmail.com>
Date: Wed, 29 Sep 2021 17:12:25 +0200
Subject: Display a meaningful error when all sourcesets are filtered (#2161)

---
 .../dokka/scripts/platform-content-handler.js      | 25 ++++++++++++++++------
 .../base/src/main/resources/dokka/styles/style.css |  6 ++++++
 2 files changed, 24 insertions(+), 7 deletions(-)

diff --git a/plugins/base/src/main/resources/dokka/scripts/platform-content-handler.js b/plugins/base/src/main/resources/dokka/scripts/platform-content-handler.js
index 64a1ce53..de5c6b15 100644
--- a/plugins/base/src/main/resources/dokka/scripts/platform-content-handler.js
+++ b/plugins/base/src/main/resources/dokka/scripts/platform-content-handler.js
@@ -6,6 +6,7 @@ filteringContext = {
 let highlightedAnchor;
 let topNavbarOffset;
 let instances = [];
+let sourcesetNotification;
 
 const samplesDarkThemeName = 'darcula'
 const samplesLightThemeName = 'idea'
@@ -201,10 +202,6 @@ function initializeFiltering() {
     let cached = window.localStorage.getItem('inactive-filters')
     if (cached) {
         let parsed = JSON.parse(cached)
-        //Events are used by react to get values in 'on this page'
-        const event = new CustomEvent('sourceset-filter-change', {detail: parsed});
-        window.dispatchEvent(event);
-
         filteringContext.activeFilters = filteringContext.restrictedDependencies
             .filter(q => parsed.indexOf(q) == -1)
     } else {
@@ -304,11 +301,25 @@ function refreshFiltering() {
                 elem.setAttribute("data-filterable-current", platformList.join(' '))
             }
         )
-    const event = new CustomEvent('sourceset-filter-change', {detail: sourcesetList});
-    window.dispatchEvent(event);
-
     refreshFilterButtons()
     refreshPlatformTabs()
+    refreshNoContentNotification()
+}
+
+function refreshNoContentNotification() {
+    const element = document.getElementsByClassName("main-content")[0]
+    if(filteringContext.activeFilters.length === 0){
+        element.style.display = "none";
+
+        const appended = document.createElement("div")
+        appended.className = "filtered-message"
+        appended.innerText = "All documentation is filtered, please adjust your source set filters in top-right corner of the screen"
+        sourcesetNotification = appended
+        element.parentNode.prepend(appended)
+    } else {
+        if(sourcesetNotification) sourcesetNotification.remove()
+        element.style.display = "block"
+    }
 }
 
 function refreshPlatformTabs() {
diff --git a/plugins/base/src/main/resources/dokka/styles/style.css b/plugins/base/src/main/resources/dokka/styles/style.css
index 65a76042..2e69c3ee 100644
--- a/plugins/base/src/main/resources/dokka/styles/style.css
+++ b/plugins/base/src/main/resources/dokka/styles/style.css
@@ -1071,6 +1071,12 @@ div.runnablesample {
     background: var(--white-10);
 }
 
+.filtered-message {
+    margin: 25px;
+    font-size: 20px;
+    font-weight: bolder;
+}
+
 @media screen and (max-width: 1119px) {
     h1.cover {
         font-size: 48px;
-- 
cgit