From 2f35908d0cdcb13140893fba86a587f3a60c1d1e Mon Sep 17 00:00:00 2001
From: Vendicated <vendicated@riseup.net>
Date: Fri, 25 Nov 2022 13:05:02 +0100
Subject: [PATCH] Make back gesture close modals and similar

---
 .../dev/vendicated/vencord/HttpClient.java    | 17 ++++++++++---
 .../dev/vendicated/vencord/MainActivity.java  | 10 +++++---
 .../vendicated/vencord/VWebviewClient.java    |  3 ++-
 .../dev/vendicated/vencord/VencordNative.java | 25 +++++++++++++++++++
 app/src/main/res/raw/vencord_mobile.js        | 12 +++++++++
 5 files changed, 58 insertions(+), 9 deletions(-)
 create mode 100644 app/src/main/java/dev/vendicated/vencord/VencordNative.java
 create mode 100644 app/src/main/res/raw/vencord_mobile.js

diff --git a/app/src/main/java/dev/vendicated/vencord/HttpClient.java b/app/src/main/java/dev/vendicated/vencord/HttpClient.java
index a58f7e6..352de20 100644
--- a/app/src/main/java/dev/vendicated/vencord/HttpClient.java
+++ b/app/src/main/java/dev/vendicated/vencord/HttpClient.java
@@ -1,5 +1,8 @@
 package dev.vendicated.vencord;
 
+import android.app.Activity;
+import android.content.res.Resources;
+
 import androidx.annotation.NonNull;
 
 import java.io.*;
@@ -39,14 +42,20 @@ public class HttpClient {
         }
     }
 
-    public static String vencord;
+    public static String VencordRuntime;
+    public static String VencordMobileRuntime;
 
-    public static void fetchVencord() throws IOException {
-        if (vencord != null) return;
+    public static void fetchVencord(Activity activity) throws IOException {
+        if (VencordRuntime != null) return;
+
+        var res = activity.getResources();
+        try (var is = res.openRawResource(R.raw.vencord_mobile)) {
+            VencordMobileRuntime = readAsText(is);
+        }
 
         var conn = fetch(VENCORD_BUNDLE_URL);
         try (var is = conn.getInputStream()) {
-            vencord = readAsText(is);
+            VencordRuntime = readAsText(is);
         }
     }
 
diff --git a/app/src/main/java/dev/vendicated/vencord/MainActivity.java b/app/src/main/java/dev/vendicated/vencord/MainActivity.java
index 04cfda3..2813d86 100644
--- a/app/src/main/java/dev/vendicated/vencord/MainActivity.java
+++ b/app/src/main/java/dev/vendicated/vencord/MainActivity.java
@@ -39,9 +39,11 @@ public class MainActivity extends Activity {
         s.setJavaScriptEnabled(true);
         s.setDomStorageEnabled(true);
         s.setAllowFileAccess(true);
-        
+
+        wv.addJavascriptInterface(new VencordNative(this, wv), "VencordMobileNative");
+
         try {
-            HttpClient.fetchVencord();
+            HttpClient.fetchVencord(this);
         } catch (IOException ex) {
             Logger.e("Failed to fetch Vencord", ex);
             return;
@@ -52,8 +54,8 @@ public class MainActivity extends Activity {
 
     @Override
     public boolean onKeyDown(int keyCode, KeyEvent event) {
-        if (keyCode == KeyEvent.KEYCODE_BACK && wv != null && wv.canGoBack()) {
-            wv.goBack();
+        if (keyCode == KeyEvent.KEYCODE_BACK && wv != null) {
+            runOnUiThread(() -> wv.evaluateJavascript("VencordMobile.onBackPress()", null));
             return true;
         }
         return super.onKeyDown(keyCode, event);
diff --git a/app/src/main/java/dev/vendicated/vencord/VWebviewClient.java b/app/src/main/java/dev/vendicated/vencord/VWebviewClient.java
index 2bff9cd..1cd46c9 100644
--- a/app/src/main/java/dev/vendicated/vencord/VWebviewClient.java
+++ b/app/src/main/java/dev/vendicated/vencord/VWebviewClient.java
@@ -18,7 +18,8 @@ public class VWebviewClient extends WebViewClient {
 
     @Override
     public void onPageStarted(WebView view, String url, Bitmap favicon) {
-        view.evaluateJavascript(HttpClient.vencord, null);
+        view.evaluateJavascript(HttpClient.VencordRuntime, null);
+        view.evaluateJavascript(HttpClient.VencordMobileRuntime, null);
     }
 
     @Nullable
diff --git a/app/src/main/java/dev/vendicated/vencord/VencordNative.java b/app/src/main/java/dev/vendicated/vencord/VencordNative.java
new file mode 100644
index 0000000..485b372
--- /dev/null
+++ b/app/src/main/java/dev/vendicated/vencord/VencordNative.java
@@ -0,0 +1,25 @@
+package dev.vendicated.vencord;
+
+import android.app.Activity;
+import android.webkit.JavascriptInterface;
+import android.webkit.WebView;
+
+public class VencordNative {
+    private final WebView wv;
+    private final Activity activity;
+
+    public VencordNative(Activity activity, WebView wv) {
+        this.activity = activity;
+        this.wv = wv;
+    }
+
+    @JavascriptInterface
+    public void goBack() {
+        activity.runOnUiThread(() -> {
+            if (wv.canGoBack())
+                wv.goBack();
+            else
+                activity.getActionBar();
+        });
+    }
+}
diff --git a/app/src/main/res/raw/vencord_mobile.js b/app/src/main/res/raw/vencord_mobile.js
new file mode 100644
index 0000000..d43c572
--- /dev/null
+++ b/app/src/main/res/raw/vencord_mobile.js
@@ -0,0 +1,12 @@
+!(() => {
+const ModalEscapeHandler = Vencord.Util.lazyWebpack(m => m.binds?.[0] === "esc" && m.binds.length === 1);
+const EscapeHandler = Vencord.Util.lazyWebpack(m => m.binds?.[0] === "esc" && m.binds[1] === "shift+pagedown");
+window.VencordMobile = {
+    onBackPress() {
+        // false implies modal closed
+        if (ModalEscapeHandler.action() === false) return;
+
+        EscapeHandler.action({target:document.activeElement});
+    }
+}
+})();
\ No newline at end of file