From fe35d5fd5a96d995e0ff434718b7b2b8bcac5ba5 Mon Sep 17 00:00:00 2001
From: Jules Aguillon
Date: Thu, 17 Mar 2022 11:24:33 +0100
Subject: Avoid ghost touches while holding modulated keys

On some devices, bogus touch events can be sent while holding a key.
With modulated keys, it can happens on top of other keys.
Ignore every new pointers when a modulated key is pressed.
---
 srcs/juloo.keyboard2/Pointers.java | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/srcs/juloo.keyboard2/Pointers.java b/srcs/juloo.keyboard2/Pointers.java
index e6db206..1f0e44c 100644
--- a/srcs/juloo.keyboard2/Pointers.java
+++ b/srcs/juloo.keyboard2/Pointers.java
@@ -107,6 +107,11 @@ public final class Pointers implements Handler.Callback
 
   public void onTouchDown(float x, float y, int pointerId, KeyboardData.Key key)
   {
+    // Ignore new presses while a modulated key is active. On some devices,
+    // ghost touch events can happen while the pointer travels on top of other
+    // keys.
+    if (isModulatedKeyPressed())
+      return;
     KeyValue value = key.key0;
     Pointer ptr = new Pointer(pointerId, key, value, x, y);
     _ptrs.add(ptr);
@@ -199,6 +204,16 @@ public final class Pointers implements Handler.Callback
     }
   }
 
+  private boolean isModulatedKeyPressed()
+  {
+    for (Pointer ptr : _ptrs)
+    {
+      if ((ptr.flags & KeyValue.FLAG_PRECISE_REPEAT) != 0)
+        return true;
+    }
+    return false;
+  }
+
   // Key repeat
 
   /** Message from [_keyrepeat_handler]. */
-- 
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