Option to disable keyboard flashing (#3050)

* Option to disable keyboard flashing

frontend/ui/elements/common_settings_menu_table.lua

@@ -38,6 +38,7 @@ common_settings.screen = {
         require("ui/elements/screen_eink_opt_menu_table"),
         require("ui/elements/screen_disable_double_tap_table"),
         require("ui/elements/refresh_menu_table"),
+        require("ui/elements/flash_keyboard"),
     },
 }
 common_settings.save_document = {

frontend/ui/elements/flash_keyboard.lua

@@ -0,0 +1,12 @@
+local _ = require("gettext")
+
+return {
+    text = _("Flash keyboard"),
+    checked_func = function()
+        return G_reader_settings:readSetting("flash_keyboard") ~= false
+    end,
+    callback = function()
+        local disabled = G_reader_settings:readSetting("flash_keyboard") ~= false
+        G_reader_settings:saveSetting("flash_keyboard", not disabled)
+    end,
+}

frontend/ui/widget/virtualkeyboard.lua

@@ -93,32 +93,45 @@ function VirtualKey:init()
             },
         }
     end
+    self.flash_keyboard = G_reader_settings:readSetting("flash_keyboard") ~= false
 end
 
 function VirtualKey:update_keyboard()
     UIManager:setDirty(self.keyboard, function()
         logger.dbg("update key region", self[1].dimen)
-        return "ui", self[1].dimen
+        return "fast", self[1].dimen
     end)
 end
 
 function VirtualKey:onTapSelect()
-    self[1].invert = true
-    self:update_keyboard()
-    if self.callback then
-        self.callback()
+    if self.flash_keyboard then
+        self[1].invert = true
+        self:update_keyboard()
+        if self.callback then
+            self.callback()
+        end
+        UIManager:scheduleIn(0.1, function() self:invert(false) end)
+    else
+        if self.callback then
+            self.callback()
+        end
     end
-    UIManager:scheduleIn(0.1, function() self:invert(false) end)
     return true
 end
 
 function VirtualKey:onHoldSelect()
-    self[1].invert = true
-    self:update_keyboard()
-    if self.hold_callback then
-        self.hold_callback()
+    if self.flash_keyboard then
+        self[1].invert = true
+        self:update_keyboard()
+        if self.hold_callback then
+            self.hold_callback()
+        end
+        UIManager:scheduleIn(0.1, function() self:invert(false) end)
+    else
+        if self.hold_callback then
+            self.hold_callback()
+        end
     end
-    UIManager:scheduleIn(0.1, function() self:invert(false) end)
     return true
 end