From ab6e6ee64f421769b31b5946f508d3beeb49e683 Mon Sep 17 00:00:00 2001
From: tuancoltech <tuancoltech@gmail.com>
Date: Fri, 18 Oct 2024 21:47:46 +0700
Subject: [PATCH] Back gesture is recognized as drawing intent:
 https://app.asana.com/0/1207819682524134/1208536199909620

---
 .../dev/arkbuilders/arkmemo/ui/views/NotesCanvas.kt   | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/app/src/main/java/dev/arkbuilders/arkmemo/ui/views/NotesCanvas.kt b/app/src/main/java/dev/arkbuilders/arkmemo/ui/views/NotesCanvas.kt
index 99f44ae7..00533937 100644
--- a/app/src/main/java/dev/arkbuilders/arkmemo/ui/views/NotesCanvas.kt
+++ b/app/src/main/java/dev/arkbuilders/arkmemo/ui/views/NotesCanvas.kt
@@ -1,6 +1,7 @@
 package dev.arkbuilders.arkmemo.ui.views
 
 import android.content.Context
+import android.content.res.Resources
 import android.graphics.Canvas
 import android.graphics.Path
 import android.util.AttributeSet
@@ -19,6 +20,8 @@ class NotesCanvas(context: Context, attrs: AttributeSet): View(context, attrs) {
     private lateinit var viewModel: GraphicNotesViewModel
     private var path = Path()
 
+    private val screenWidth by lazy { Resources.getSystem().displayMetrics.widthPixels }
+
     override fun onDraw(canvas: Canvas) {
         val paths = viewModel.paths()
         if (paths.isNotEmpty()) {
@@ -32,6 +35,14 @@ class NotesCanvas(context: Context, attrs: AttributeSet): View(context, attrs) {
         val x = event.x
         val y = event.y
 
+        val edgeThreshold = 50
+
+        // When touch point starts from either of the left or right side of the screen,
+        // that's probably a back gesture. Do not draw in this case
+        if (x < edgeThreshold || x > screenWidth - edgeThreshold) {
+            return false
+        }
+
         var finishDrawing = false
         when(event.action) {
             MotionEvent.ACTION_DOWN -> {