Gesture: add jump to random page (#11727)

frontend/apps/reader/modules/readergoto.lua

@@ -181,4 +181,28 @@ function ReaderGoto:onGoToEnd()
     return true
 end
 
+function ReaderGoto:onGoToRandomPage()
+    local page_count = self.document:getPageCount()
+    if page_count == 1 then return true end
+    local current_page = self.ui:getCurrentPage()
+    if self.pages_pool == nil then
+        self.pages_pool = {}
+    end
+    if #self.pages_pool == 0 or (#self.pages_pool == 1 and self.pages_pool[1] == current_page) then
+        for i = 1, page_count do
+            self.pages_pool[i] = i
+        end
+    end
+    while true do
+        local random_page_idx = math.random(1, #self.pages_pool)
+        local random_page = self.pages_pool[random_page_idx]
+        if random_page ~= current_page then
+            table.remove(self.pages_pool, random_page_idx)
+            self.ui.link:addCurrentLocationToStack()
+            self.ui:handleEvent(Event:new("GotoPage", random_page))
+            return true
+        end
+    end
+end
+
 return ReaderGoto

frontend/dispatcher.lua

@@ -140,6 +140,7 @@ local settingsList = {
     next_chapter = {category="none", event="GotoNextChapter", title=_("Next chapter"), reader=true},
     first_page = {category="none", event="GoToBeginning", title=_("First page"), reader=true},
     last_page = {category="none", event="GoToEnd", title=_("Last page"), reader=true},
+    random_page = {category="none", event="GoToRandomPage", title=_("Random page"), reader=true},
     page_jmp = {category="absolutenumber", event="GotoViewRel", min=-100, max=100, title=_("Turn pages"), reader=true},
     go_to = {category="none", event="ShowGotoDialog", title=_("Go to page"), filemanager=true, reader=true},
     skim = {category="none", event="ShowSkimtoDialog", title=_("Skim document"), reader=true},
@@ -359,6 +360,7 @@ local dispatcher_menu_order = {
     "next_chapter",
     "first_page",
     "last_page",
+    "random_page",
     "page_jmp",
     "go_to",
     "skim",