Add "Invert page turn buttons" to Dispatcher (#9494)

Fix #9492

frontend/device/devicelistener.lua

@@ -313,6 +313,11 @@ function DeviceListener:onToggleNoFlashOnSecondChapterPage()
     _toggleSetting("no_refresh_on_second_chapter_page")
 end
 
+function DeviceListener:onSwapPageTurnButtons()
+    _toggleSetting("input_invert_page_turn_keys")
+    Device:invertButtons()
+end
+
 if Device:canReboot() then
     function DeviceListener:onReboot()
         UIManager:show(ConfirmBox:new{

frontend/dispatcher.lua

@@ -134,6 +134,7 @@ local settingsList = {
     toggle_bookmark = {category="none", event="ToggleBookmark", title=_("Toggle bookmark"), reader=true},
     toggle_page_change_animation = {category="none", event="TogglePageChangeAnimation", title=_("Toggle page turn animations"), reader=true, condition=Device:canDoSwipeAnimation()},
     toggle_inverse_reading_order = {category="none", event="ToggleReadingOrder", title=_("Toggle page turn direction"), reader=true, separator=true},
+    swap_page_turn_buttons = {category="none", event="SwapPageTurnButtons", title=_("Invert page turn buttons"), reader=true, condition=Device:hasKeys(), separator=true},
     cycle_highlight_action = {category="none", event="CycleHighlightAction", title=_("Cycle highlight action"), reader=true},
     cycle_highlight_style = {category="none", event="CycleHighlightStyle", title=_("Cycle highlight style"), reader=true},
     page_jmp = {category="absolutenumber", event="GotoViewRel", min=-100, max=100, title=_("Go %1 pages"), reader=true},
@@ -317,6 +318,7 @@ local dispatcher_menu_order = {
     "toggle_page_flipping",
     "toggle_reflow",
     "toggle_inverse_reading_order",
+    "swap_page_turn_buttons",
     "zoom",
     "zoom_factor_change",
     "cycle_highlight_action",

frontend/ui/elements/page_turns.lua

@@ -161,8 +161,7 @@ if Device:hasKeys() then
             return G_reader_settings:isTrue("input_invert_page_turn_keys")
         end,
         callback = function()
-            G_reader_settings:flipNilOrFalse("input_invert_page_turn_keys")
-            Device:invertButtons()
+            UIManager:broadcastEvent(Event:new("SwapPageTurnButtons"))
         end,
     })
 end