ReaderGesture: cleanup (#6292)

convert all gesture actions to use events for better modularity
add network event handlers and device event handlers

frontend/apps/reader/readerui.lua

@@ -8,6 +8,7 @@ local BD = require("ui/bidi")
 local Cache = require("cache")
 local ConfirmBox = require("ui/widget/confirmbox")
 local Device = require("device")
+local DeviceListener = require("device/devicelistener")
 local DocSettings = require("docsettings")
 local DocumentRegistry = require("document/documentregistry")
 local Event = require("ui/event")
@@ -29,7 +30,6 @@ local ReaderCropping = require("apps/reader/modules/readercropping")
 local ReaderDeviceStatus = require("apps/reader/modules/readerdevicestatus")
 local ReaderDictionary = require("apps/reader/modules/readerdictionary")
 local ReaderFont = require("apps/reader/modules/readerfont")
-local ReaderFrontLight = require("apps/reader/modules/readerfrontlight")
 local ReaderGesture = require("apps/reader/modules/readergesture")
 local ReaderGoto = require("apps/reader/modules/readergoto")
 local ReaderHinting = require("apps/reader/modules/readerhinting")
@@ -187,14 +187,6 @@ function ReaderUI:init()
         view = self.view,
         ui = self
     }, true)
-    -- frontlight controller
-    if Device:hasFrontlight() then
-        self:registerModule("frontlight", ReaderFrontLight:new{
-            dialog = self.dialog,
-            view = self.view,
-            ui = self
-        })
-    end
     -- device status controller
     self:registerModule("battery", ReaderDeviceStatus:new{
         ui = self,
@@ -371,6 +363,12 @@ function ReaderUI:init()
         document = self.document,
         ui = self,
     })
+    -- event listener to change device settings
+    self:registerModule("devicelistener", DeviceListener:new {
+        document = self.document,
+        view = self.view,
+        ui = self,
+    })
     -- koreader plugins
     for _, plugin_module in ipairs(PluginLoader:loadPlugins()) do
         local ok, plugin_or_err = PluginLoader:createPluginInstance(
@@ -396,6 +394,15 @@ function ReaderUI:init()
         })
     end
 
+    if Device:hasWifiToggle() then
+        local NetworkListener = require("ui/network/networklistener")
+        self:registerModule("networklistener", NetworkListener:new {
+            document = self.document,
+            view = self.view,
+            ui = self,
+        })
+    end
+
     -- Allow others to change settings based on external factors
     -- Must be called after plugins are loaded & before setting are read.
     self:handleEvent(Event:new("DocSettingsLoad", self.doc_settings, self.document))
@@ -761,6 +768,10 @@ function ReaderUI:switchDocument(new_file)
     self:showReader(new_file)
 end
 
+function ReaderUI:onOpenLastDoc()
+    self:switchDocument(self.menu:getPreviousFile())
+end
+
 function ReaderUI:getCurrentPage()
     if self.document.info.has_pages then
         return self.paging.current_page