From d1478fb6c3e112cb08c319254da5c898646481c6 Mon Sep 17 00:00:00 2001
From: agnostic-apollo <agnosticapollo@gmail.com>
Date: Mon, 23 Aug 2021 08:56:36 +0500
Subject: [PATCH] Fixed: Ensure `FN` extra key is read by the terminal

Can't find info on why it wasn't being read before
---
 .../com/termux/app/terminal/TermuxTerminalViewClient.java   | 5 +++++
 .../src/main/java/com/termux/view/TerminalView.java         | 5 ++++-
 .../src/main/java/com/termux/view/TerminalViewClient.java   | 2 ++
 .../shared/terminal/TermuxTerminalViewClientBase.java       | 6 ++++++
 4 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/app/src/main/java/com/termux/app/terminal/TermuxTerminalViewClient.java b/app/src/main/java/com/termux/app/terminal/TermuxTerminalViewClient.java
index 329a8633..d59f5dba 100644
--- a/app/src/main/java/com/termux/app/terminal/TermuxTerminalViewClient.java
+++ b/app/src/main/java/com/termux/app/terminal/TermuxTerminalViewClient.java
@@ -302,6 +302,11 @@ public class TermuxTerminalViewClient extends TermuxTerminalViewClientBase {
         return readExtraKeysSpecialButton(SpecialButton.SHIFT);
     }
 
+    @Override
+    public boolean readFnKey() {
+        return readExtraKeysSpecialButton(SpecialButton.FN);
+    }
+
     public boolean readExtraKeysSpecialButton(SpecialButton specialButton) {
         if (mActivity.getExtraKeysView() == null) return false;
         Boolean state = mActivity.getExtraKeysView().readSpecialButton(specialButton, true);
diff --git a/terminal-view/src/main/java/com/termux/view/TerminalView.java b/terminal-view/src/main/java/com/termux/view/TerminalView.java
index 198c328b..88537878 100644
--- a/terminal-view/src/main/java/com/termux/view/TerminalView.java
+++ b/terminal-view/src/main/java/com/termux/view/TerminalView.java
@@ -599,6 +599,7 @@ public final class TerminalView extends View {
         final boolean controlDown = event.isCtrlPressed() || mClient.readControlKey();
         final boolean leftAltDown = (metaState & KeyEvent.META_ALT_LEFT_ON) != 0 || mClient.readAltKey();
         final boolean shiftDown = event.isShiftPressed() || mClient.readShiftKey();
+        final boolean fnDown = event.isFunctionPressed() || mClient.readFnKey();
         final boolean rightAltDownFromEvent = (metaState & KeyEvent.META_ALT_RIGHT_ON) != 0;
 
         int keyMod = 0;
@@ -606,7 +607,8 @@ public final class TerminalView extends View {
         if (event.isAltPressed() || leftAltDown) keyMod |= KeyHandler.KEYMOD_ALT;
         if (shiftDown) keyMod |= KeyHandler.KEYMOD_SHIFT;
         if (event.isNumLockOn()) keyMod |= KeyHandler.KEYMOD_NUM_LOCK;
-        if (!event.isFunctionPressed() && handleKeyCode(keyCode, keyMod)) {
+        // https://github.com/termux/termux-app/issues/731
+        if (!fnDown && handleKeyCode(keyCode, keyMod)) {
             if (TERMINAL_VIEW_KEY_LOGGING_ENABLED) mClient.logInfo(LOG_TAG, "handleKeyCode() took key event");
             return true;
         }
@@ -622,6 +624,7 @@ public final class TerminalView extends View {
         int effectiveMetaState = event.getMetaState() & ~bitsToClear;
 
         if (shiftDown) effectiveMetaState |= KeyEvent.META_SHIFT_ON | KeyEvent.META_SHIFT_LEFT_ON;
+        if (fnDown) effectiveMetaState |= KeyEvent.META_FUNCTION_ON;
 
         int result = event.getUnicodeChar(effectiveMetaState);
         if (TERMINAL_VIEW_KEY_LOGGING_ENABLED)
diff --git a/terminal-view/src/main/java/com/termux/view/TerminalViewClient.java b/terminal-view/src/main/java/com/termux/view/TerminalViewClient.java
index d68ccbca..d6b49b89 100644
--- a/terminal-view/src/main/java/com/termux/view/TerminalViewClient.java
+++ b/terminal-view/src/main/java/com/termux/view/TerminalViewClient.java
@@ -56,6 +56,8 @@ public interface TerminalViewClient {
 
     boolean readShiftKey();
 
+    boolean readFnKey();
+
 
 
     boolean onCodePoint(int codePoint, boolean ctrlDown, TerminalSession session);
diff --git a/termux-shared/src/main/java/com/termux/shared/terminal/TermuxTerminalViewClientBase.java b/termux-shared/src/main/java/com/termux/shared/terminal/TermuxTerminalViewClientBase.java
index cf3d940c..167ec6bc 100644
--- a/termux-shared/src/main/java/com/termux/shared/terminal/TermuxTerminalViewClientBase.java
+++ b/termux-shared/src/main/java/com/termux/shared/terminal/TermuxTerminalViewClientBase.java
@@ -67,10 +67,16 @@ public class TermuxTerminalViewClientBase implements TerminalViewClient {
         return false;
     }
 
+    @Override
     public boolean readShiftKey() {
         return false;
     }
 
+    @Override
+    public boolean readFnKey() {
+        return false;
+    }
+
 
 
     @Override