fix: adjust pan rate for eink and non-eink screens

frontend/apps/reader/modules/readerpaging.lua

@@ -10,9 +10,6 @@ local logger = require("logger")
 local _ = require("gettext")
 
 
-local pan_rate = Screen.eink and 4.0 or 10.0
-
-
 local function copyPageState(page_state)
     return {
         page = page_state.page,
@@ -27,6 +24,7 @@ end
 
 
 local ReaderPaging = InputContainer:new{
+    pan_rate = 30,  -- default 30 ops, will be adjusted in readerui
     current_page = 0,
     number_of_pages = 0,
     last_pan_relative_y = 0,
@@ -133,7 +131,7 @@ function ReaderPaging:setupTouchZones()
         {
             id = "paging_pan",
             ges = "pan",
-            rate = pan_rate,
+            rate = self.pan_rate,
             screen_zone = {
                 ratio_x = 0, ratio_y = 0, ratio_w = 1, ratio_h = 1,
             },

frontend/apps/reader/modules/readerrolling.lua

@@ -8,7 +8,6 @@ local UIManager = require("ui/uimanager")
 local logger = require("logger")
 local _ = require("gettext")
 
-local pan_rate = Screen.eink and 4.0 or 10.0
 
 --[[
     Rolling is just like paging in page-based documents except that
@@ -31,6 +30,7 @@ local pan_rate = Screen.eink and 4.0 or 10.0
     rendering.
 --]]
 local ReaderRolling = InputContainer:new{
+    pan_rate = 30,  -- default 30 ops, will be adjusted in readerui
     old_doc_height = nil,
     old_page = nil,
     current_pos = 0,
@@ -225,7 +225,7 @@ function ReaderRolling:setupTouchZones()
         {
             id = "rolling_pan",
             ges = "pan",
-            rate = pan_rate,
+            rate = self.pan_rate,
             screen_zone = {
                 ratio_x = 0, ratio_y = 0, ratio_w = 1, ratio_h = 1,
             },

frontend/apps/reader/readerui.lua

@@ -85,6 +85,9 @@ function ReaderUI:registerPostInitCallback(callback)
 end
 
 function ReaderUI:init()
+    -- cap screen refresh on pan to 2 refreshes per second
+    local pan_rate = Screen.eink and 2.0 or 30.0
+
     self.postInitCallback = {}
     -- if we are not the top level dialog ourselves, it must be given in the table
     if not self.dialog then
@@ -229,6 +232,7 @@ function ReaderUI:init()
         })
         -- paging controller
         self:registerModule("paging", ReaderPaging:new{
+            pan_rate = pan_rate,
             dialog = self.dialog,
             view = self.view,
             ui = self
@@ -284,6 +288,7 @@ function ReaderUI:init()
         })
         -- rolling controller
         self:registerModule("rolling", ReaderRolling:new{
+            pan_rate = pan_rate,
             dialog = self.dialog,
             view = self.view,
             ui = self