From 66a9495d91b72119830fd2bafcc9f3e2230f754f Mon Sep 17 00:00:00 2001
From: agnostic-apollo <agnosticapollo@gmail.com>
Date: Sun, 21 May 2023 07:46:07 +0500
Subject: [PATCH] Fixed: Fix `SHIFT+PAGE_UP` and `SHIFT+PAGE_DOWN` behaviour to
 scroll `1` line of scrollback history instead of scrolling command history or
 changing pages

This will work for both `SHIFT` extra key and hardware keyboards. The `SHIFT` extra key can be long held to lock it in an enabled state and `PGUP` and `PGDN` keys can be long held to repeat scrolling.

Closes #867
---
 .../java/com/termux/view/TerminalView.java    | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)

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 3baecd24..586cd633 100644
--- a/terminal-view/src/main/java/com/termux/view/TerminalView.java
+++ b/terminal-view/src/main/java/com/termux/view/TerminalView.java
@@ -11,6 +11,7 @@ import android.graphics.Typeface;
 import android.os.Build;
 import android.os.Handler;
 import android.os.Looper;
+import android.os.SystemClock;
 import android.text.Editable;
 import android.text.InputType;
 import android.text.TextUtils;
@@ -872,6 +873,9 @@ public final class TerminalView extends View {
         if (mEmulator != null)
             mEmulator.setCursorBlinkState(true);
 
+        if (handleKeyCodeAction(keyCode, keyMod))
+            return true;
+
         TerminalEmulator term = mTermSession.getEmulator();
         String code = KeyHandler.getCode(keyCode, keyMod, term.isCursorKeysApplicationMode(), term.isKeypadApplicationMode());
         if (code == null) return false;
@@ -879,6 +883,26 @@ public final class TerminalView extends View {
         return true;
     }
 
+    public boolean handleKeyCodeAction(int keyCode, int keyMod) {
+        boolean shiftDown = (keyMod & KeyHandler.KEYMOD_SHIFT) != 0;
+
+        switch (keyCode) {
+            case KeyEvent.KEYCODE_PAGE_UP:
+            case KeyEvent.KEYCODE_PAGE_DOWN:
+                // shift+page_up and shift+page_down should scroll scrollback history instead of
+                // scrolling command history or changing pages
+                if (shiftDown) {
+                    long time = SystemClock.uptimeMillis();
+                    MotionEvent motionEvent = MotionEvent.obtain(time, time, MotionEvent.ACTION_DOWN, 0, 0, 0);
+                    doScroll(motionEvent, keyCode == KeyEvent.KEYCODE_PAGE_UP ? -1 : 1);
+                    motionEvent.recycle();
+                    return true;
+                }
+        }
+
+       return false;
+    }
+
     /**
      * Called when a key is released in the view.
      *