ReaderGesture: cleanup (#6292)

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

frontend/ui/network/networklistener.lua

@@ -0,0 +1,67 @@
+local BD = require("ui/bidi")
+local InfoMessage = require("ui/widget/infomessage")
+local InputContainer = require("ui/widget/container/inputcontainer")
+local NetworkMgr = require("ui/network/manager")
+local UIManager = require("ui/uimanager")
+local _ = require("gettext")
+local T = require("ffi/util").template
+
+local NetworkListener = InputContainer:new{}
+
+function NetworkListener:onToggleWifi()
+    if not NetworkMgr:isOnline() then
+        UIManager:show(InfoMessage:new{
+            text = _("Turning on Wi-Fi…"),
+            timeout = 1,
+        })
+
+        -- NB Normal widgets should use NetworkMgr:promptWifiOn()
+        -- This is specifically the toggle wifi action, so consent is implied.
+        NetworkMgr:turnOnWifi()
+    else
+        NetworkMgr:turnOffWifi()
+
+        UIManager:show(InfoMessage:new{
+            text = _("Wi-Fi off."),
+            timeout = 1,
+        })
+    end
+end
+
+function NetworkListener:onInfoWifiOff()
+    -- can't hurt
+    NetworkMgr:turnOffWifi()
+
+    UIManager:show(InfoMessage:new{
+        text = _("Wi-Fi off."),
+        timeout = 1,
+    })
+end
+
+function NetworkListener:onInfoWifiOn()
+    if not NetworkMgr:isOnline() then
+        UIManager:show(InfoMessage:new{
+            text = _("Enabling wifi…"),
+            timeout = 1,
+        })
+
+        -- NB Normal widgets should use NetworkMgr:promptWifiOn()
+        -- This is specifically the toggle Wi-Fi action, so consent is implied.
+        NetworkMgr:turnOnWifi()
+    else
+        local info_text
+        local current_network = NetworkMgr:getCurrentNetwork()
+        -- this method is only available for some implementations
+        if current_network and current_network.ssid then
+            info_text = T(_("Already connected to network %1."), BD.wrap(current_network.ssid))
+        else
+            info_text = _("Already connected.")
+        end
+        UIManager:show(InfoMessage:new{
+            text = info_text,
+            timeout = 1,
+        })
+    end
+end
+
+return NetworkListener