[UIManager] Outsource device specific event handlers (was: some nits) (#9448)

frontend/device/kobo/device.lua

@@ -1235,6 +1235,108 @@ function Kobo:isStartupScriptUpToDate()
     return md5.sumFile(current_script) == md5.sumFile(new_script)
 end
 
+function Kobo:setEventHandlers(UIManager)
+    -- We do not want auto suspend procedure to waste battery during
+    -- suspend. So let's unschedule it when suspending, and restart it after
+    -- resume. Done via the plugin's onSuspend/onResume handlers.
+    UIManager.event_handlers["Suspend"] = function()
+        self:_beforeSuspend()
+        self:onPowerEvent("Suspend")
+    end
+    UIManager.event_handlers["Resume"] = function()
+        -- MONOTONIC doesn't tick during suspend,
+        -- invalidate the last battery capacity pull time so that we get up to date data immediately.
+        self:getPowerDevice():invalidateCapacityCache()
+
+        self:onPowerEvent("Resume")
+        self:_afterResume()
+    end
+    UIManager.event_handlers["PowerPress"] = function()
+        -- Always schedule power off.
+        -- Press the power button for 2+ seconds to shutdown directly from suspend.
+        UIManager:scheduleIn(2, UIManager.poweroff_action)
+    end
+    UIManager.event_handlers["PowerRelease"] = function()
+        if not self._entered_poweroff_stage then
+            UIManager:unschedule(UIManager.poweroff_action)
+            -- resume if we were suspended
+            if self.screen_saver_mode then
+                UIManager.event_handlers["Resume"]()
+            else
+                UIManager.event_handlers["Suspend"]()
+            end
+        end
+    end
+    UIManager.event_handlers["Light"] = function()
+        self:getPowerDevice():toggleFrontlight()
+    end
+    -- USB plug events with a power-only charger
+    UIManager.event_handlers["Charging"] = function()
+        self:_beforeCharging()
+        -- NOTE: Plug/unplug events will wake the device up, which is why we put it back to sleep.
+        if self.screen_saver_mode then
+           UIManager.event_handlers["Suspend"]()
+        end
+    end
+    UIManager.event_handlers["NotCharging"] = function()
+        -- We need to put the device into suspension, other things need to be done before it.
+        self:usbPlugOut()
+        self:_afterNotCharging()
+        if self.screen_saver_mode then
+           UIManager.event_handlers["Suspend"]()
+        end
+    end
+    -- USB plug events with a data-aware host
+    UIManager.event_handlers["UsbPlugIn"] = function()
+        self:_beforeCharging()
+        -- NOTE: Plug/unplug events will wake the device up, which is why we put it back to sleep.
+        if self.screen_saver_mode then
+            UIManager.event_handlers["Suspend"]()
+        else
+            -- Potentially start an USBMS session
+            local MassStorage = require("ui/elements/mass_storage")
+            MassStorage:start()
+        end
+    end
+    UIManager.event_handlers["UsbPlugOut"] = function()
+        -- We need to put the device into suspension, other things need to be done before it.
+        self:usbPlugOut()
+        self:_afterNotCharging()
+        if self.screen_saver_mode then
+            UIManager.event_handlers["Suspend"]()
+        else
+            -- Potentially dismiss the USBMS ConfirmBox
+            local MassStorage = require("ui/elements/mass_storage")
+            MassStorage:dismiss()
+        end
+    end
+    -- Sleep Cover handling
+    if G_reader_settings:isTrue("ignore_power_sleepcover") then
+        -- NOTE: The hardware event itself will wake the kernel up if it's in suspend (:/).
+        --       Let the unexpected wakeup guard handle that.
+        UIManager.event_handlers["SleepCoverClosed"] = nil
+        UIManager.event_handlers["SleepCoverOpened"] = nil
+    elseif G_reader_settings:isTrue("ignore_open_sleepcover") then
+        -- Just ignore wakeup events, and do NOT set is_cover_closed,
+        -- so device/generic/device will let us use the power button to wake ;).
+        UIManager.event_handlers["SleepCoverClosed"] = function()
+            UIManager.event_handlers["Suspend"]()
+        end
+        UIManager.event_handlers["SleepCoverOpened"] = function()
+            self.is_cover_closed = false
+        end
+    else
+        UIManager.event_handlers["SleepCoverClosed"] = function()
+            self.is_cover_closed = true
+            UIManager.event_handlers["Suspend"]()
+        end
+        UIManager.event_handlers["SleepCoverOpened"] = function()
+            self.is_cover_closed = false
+            UIManager.event_handlers["Resume"]()
+        end
+    end
+end
+
 -------------- device probe ------------
 
 local codename = getCodeName()