Dispatcher: Allow toggling USBMS (#11123)

It's right next to actual exit/restart actions, so it'll never ask for confirmation.

frontend/device/devicelistener.lua

@@ -328,6 +328,14 @@ function DeviceListener:onToggleKeyRepeat(toggle)
     Device:toggleKeyRepeat(G_reader_settings:nilOrFalse("input_no_key_repeat"))
 end
 
+function DeviceListener:onRequestUSBMS()
+    local MassStorage = require("ui/elements/mass_storage")
+    -- It already takes care of the canToggleMassStorage cap check for us
+    -- NOTE: Never request confirmation, it's sorted right next to exit, restart & friends in Dispatcher,
+    --       and they don't either...
+    MassStorage:start(false)
+end
+
 function DeviceListener:onRestart()
     self.ui.menu:exitOrRestart(function() UIManager:restartKOReader() end)
 end

frontend/dispatcher.lua

@@ -66,6 +66,7 @@ local settingsList = {
 
     -- Device
     exit_screensaver = {category="none", event="ExitScreensaver", title=_("Exit screensaver"), device=true},
+    start_usbms = {category="none", event="RequestUSBMS", title=_("Start USB storage"), device=true, condition=Device:canToggleMassStorage()},
     suspend = {category="none", event="RequestSuspend", title=_("Suspend"), device=true, condition=Device:canSuspend()},
     restart = {category="none", event="Restart", title=_("Restart KOReader"), device=true, condition=Device:canRestart()},
     reboot = {category="none", event="RequestReboot", title=_("Reboot the device"), device=true, condition=Device:canReboot()},
@@ -281,6 +282,7 @@ local dispatcher_menu_order = {
 
     -- Device
     "exit_screensaver",
+    "start_usbms",
     "suspend",
     "restart",
     "reboot",

frontend/ui/elements/mass_storage.lua

@@ -43,18 +43,25 @@ function MassStorage:getActionsMenuTable()
         text = _("Start USB storage"),
         enabled_func = function() return self:isEnabled() end,
         callback = function()
-            self:start(true)
+            self:start(false)
         end,
     }
 end
 
 -- exit KOReader and start mass storage mode.
-function MassStorage:start(never_ask)
+function MassStorage:start(with_confirmation)
     if not Device:canToggleMassStorage() or not self:isEnabled() then
         return
     end
 
-    if not never_ask and self:requireConfirmation() then
+    local ask
+    if with_confirmation ~= nil then
+        ask = with_confirmation
+    else
+        ask = self:requireConfirmation()
+    end
+
+    if ask then
         local ConfirmBox = require("ui/widget/confirmbox")
         self.usbms_widget = ConfirmBox:new{
             text = _("Share storage via USB?"),