android: touchscreen toggle option (#5564)

frontend/device/input.lua

@@ -324,7 +324,8 @@ function Input:handleKeyBoardEv(ev)
     end
 
     -- The hardware camera button is used in Android to toggle the touchscreen
-    if keycode == "Camera" and ev.value == EVENT_VALUE_KEY_RELEASE then
+    if keycode == "Camera" and ev.value == EVENT_VALUE_KEY_RELEASE
+        and G_reader_settings:isTrue("camera_key_toggles_touchscreen") then
         local isAndroid, android = pcall(require, "android")
         if isAndroid then
             -- toggle touchscreen behaviour

frontend/ui/elements/common_settings_menu_table.lua

@@ -220,6 +220,13 @@ if Device:isAndroid() then
         end,
     }
 
+    -- camera key events
+    common_settings.android_camera_key = {
+        text = _("Camera key toggles touchscreen support"),
+        checked_func = function() return G_reader_settings:isTrue("camera_key_toggles_touchscreen") end,
+        callback = function() G_reader_settings:flipNilOrFalse("camera_key_toggles_touchscreen") end,
+    }
+
     -- fullscreen toggle on devices with compatible fullscreen methods (apis 14-18)
     if Device.firmware_rev < 19 then
         common_settings.fullscreen = {

frontend/ui/elements/filemanager_menu_order.lua

@@ -53,6 +53,7 @@ local order = {
         "back_in_filemanager",
         "enable_back_history",
         "android_volume_keys",
+        "android_camera_key",
         "----------------------------",
         "invert_page_turn_buttons",
     },

frontend/ui/elements/reader_menu_order.lua

@@ -72,6 +72,7 @@ local order = {
         "back_in_filemanager",
         "enable_back_history",
         "android_volume_keys",
+        "android_camera_key",
         "----------------------------",
         "invert_page_turn_gestures",
         "invert_page_turn_buttons",