From d338e6196c085ed208a5df69f9e534ce148cc2cf Mon Sep 17 00:00:00 2001
From: Mark Qvist <mark@unsigned.io>
Date: Wed, 6 Jul 2022 19:18:26 +0200
Subject: [PATCH] Circumvention for SDL2 focus bug

---
 main.py | 38 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 37 insertions(+), 1 deletion(-)

diff --git a/main.py b/main.py
index 342980d..db14f5b 100644
--- a/main.py
+++ b/main.py
@@ -26,6 +26,10 @@ from kivymd.uix.dialog import MDDialog
 __version__ = "0.1.5"
 __variant__ = "alpha"
 
+if RNS.vendor.platformutils.get_platform() == "android":
+    from jnius import autoclass
+    from android.runnable import run_on_ui_thread
+
 class SidebandApp(MDApp):
     def __init__(self, **kwargs):
         super().__init__(**kwargs)
@@ -85,16 +89,48 @@ class SidebandApp(MDApp):
                 if self.announces_view != None:
                     self.announces_view.update()
 
-    def on_start(self):
+    def on_start(self):        
         self.last_exit_event = time.time()
         EventLoop.window.bind(on_keyboard=self.keyboard_event)
         EventLoop.window.bind(on_key_down=self.keydown_event)
+        
+        # This incredibly hacky hack circumvents a bug in SDL2
+        # that prevents focus from being correctly released from
+        # the software keyboard on Android. Without this the back
+        # button/gesture does not work after the soft-keyboard has
+        # appeared for the first time.
+        if RNS.vendor.platformutils.get_platform() == "android":
+            BIND_CLASSES = ["kivymd.uix.textfield.textfield.MDTextField",]
+            
+            for e in self.root.ids:
+                te = self.root.ids[e]
+                ts = str(te).split(" ")[0].replace("<", "")
+
+                if ts in BIND_CLASSES:
+                    te.bind(focus=self.android_focus_fix)
+                #     RNS.log("Bound "+str(e)+" / "+ts)
+                # else:
+                #     RNS.log("Did not bind "+str(e)+" / "+ts)
+
+                # RNS.log(str(e))
 
         self.root.ids.screen_manager.app = self
         self.root.ids.app_version_info.text = "Sideband v"+__version__+" "+__variant__
         self.open_conversations()
 
         Clock.schedule_interval(self.jobs, 1)
+    
+    # Part of the focus hack fix
+    def android_focus_fix(self, sender, val):
+        if not val:
+            @run_on_ui_thread
+            def fix_back_button():
+                activity = autoclass('org.kivy.android.PythonActivity').mActivity
+                activity.onWindowFocusChanged(False)
+                activity.onWindowFocusChanged(True)
+
+            fix_back_button()
+
 
     def keydown_event(self, instance, keyboard, keycode, text, modifiers):
         if len(modifiers) > 0 and modifiers[0] == 'ctrl' and (text == "w" or text == "q"):