koreader/frontend/ui/elements/page_turns.lua

local Event = require("ui/event")
local ReaderUI = require("apps/reader/readerui")
local UIManager = require("ui/uimanager")
local _ = require("gettext")
local T = require("ffi/util").template

local page_turns_tap_zones_sub_items = {} -- build the Tap zones submenu
local tap_zones = {
    default = _("Default"),
    left_right = _("Left/right"),
    top_bottom = _("Top/bottom"),
}
local function genTapZonesMenu(tap_zones_type)
    table.insert(page_turns_tap_zones_sub_items, {
        text = tap_zones[tap_zones_type],
        checked_func = function()
            return G_reader_settings:readSetting("page_turns_tap_zones", "default") == tap_zones_type
        end,
        callback = function()
            G_reader_settings:saveSetting("page_turns_tap_zones", tap_zones_type)
            ReaderUI.instance.view:setupTouchZones()
        end,
    })
end
genTapZonesMenu("default")
genTapZonesMenu("left_right")
genTapZonesMenu("top_bottom")

local default_size_b = math.floor(G_defaults:readSetting("DTAP_ZONE_BACKWARD").w * 100)
local default_size_f = math.floor(G_defaults:readSetting("DTAP_ZONE_FORWARD").w * 100)
local function getTapZonesSize()
    local size_b, size_f
    if G_reader_settings:has("page_turns_tap_zone_forward_size_ratio") then
        size_f = math.floor(G_reader_settings:readSetting("page_turns_tap_zone_forward_size_ratio") * 100)
        if G_reader_settings:has("page_turns_tap_zone_backward_size_ratio") then
            size_b = math.floor(G_reader_settings:readSetting("page_turns_tap_zone_backward_size_ratio") * 100)
        else
            size_b = 100 - size_f
        end
    else
        size_b = default_size_b
        size_f = default_size_f
    end
    return size_b, size_f
end
table.insert(page_turns_tap_zones_sub_items, {
    text_func = function()
        return T(_("Backward / forward tap zone size: %1 % / %2 %"), getTapZonesSize())
    end,
    enabled_func = function()
        return G_reader_settings:readSetting("page_turns_tap_zones", "default") ~= "default"
    end,
    keep_menu_open = true,
    callback = function(touchmenu_instance)
        local is_left_right = G_reader_settings:readSetting("page_turns_tap_zones") == "left_right"
        local size_b, size_f = getTapZonesSize()
        UIManager:show(require("ui/widget/doublespinwidget"):new{
            title_text = is_left_right and _("Tap zone width") or _("Tap zone height"),
            info_text = is_left_right and _("Percentage of screen width") or _("Percentage of screen height"),
            left_text = _("Backward"),
            left_value = size_b,
            left_min = 0,
            left_max = 100 - size_f,
            left_default = default_size_b,
            left_hold_step = 5,
            right_text = _("Forward"),
            right_value = size_f,
            right_min = 0,
            right_max = 100,
            right_default = default_size_f,
            right_hold_step = 5,
            unit = "%",
            callback = function(value_b, value_f)
                if value_b + value_f > 100 then
                    value_b = 100 - value_f
                end
                G_reader_settings:saveSetting("page_turns_tap_zone_backward_size_ratio", value_b * (1/100))
                G_reader_settings:saveSetting("page_turns_tap_zone_forward_size_ratio", value_f * (1/100))
                ReaderUI.instance.view:setupTouchZones()
                if touchmenu_instance then touchmenu_instance:updateItems() end
            end,
        })
    end,
})

local PageTurns = {
    text = _("Page turns"),
    sub_item_table = {
        {
            text = _("With taps"),
            checked_func = function()
                return G_reader_settings:nilOrFalse("page_turns_disable_tap")
            end,
            callback = function()
                G_reader_settings:flipNilOrFalse("page_turns_disable_tap")
            end,
        },
        {
            text = _("With swipes"),
            checked_func = function()
                return G_reader_settings:nilOrFalse("page_turns_disable_swipe")
            end,
            callback = function()
                G_reader_settings:flipNilOrFalse("page_turns_disable_swipe")
            end,
        },
        {
            text_func = function()
                local tap_zones_type = G_reader_settings:readSetting("page_turns_tap_zones", "default")
                return T(_("Tap zones: %1"), tap_zones[tap_zones_type]:lower())
            end,
            enabled_func = function()
                return G_reader_settings:nilOrFalse("page_turns_disable_tap")
            end,
            sub_item_table = page_turns_tap_zones_sub_items,
            separator = true,
        },
        {
            text_func = function()
                local text = _("Invert page turn taps and swipes")
                if G_reader_settings:isTrue("inverse_reading_order") then
                    text = text .. "   ★"
                end
                return text
            end,
            checked_func = function()
                return ReaderUI.instance.view.inverse_reading_order
            end,
            callback = function()
                UIManager:broadcastEvent(Event:new("ToggleReadingOrder"))
            end,
            hold_callback = function(touchmenu_instance)
                local inverse_reading_order = G_reader_settings:isTrue("inverse_reading_order")
                local MultiConfirmBox = require("ui/widget/multiconfirmbox")
                UIManager:show(MultiConfirmBox:new{
                    text = inverse_reading_order and _("The default (★) for newly opened books is right-to-left (RTL) page turning.\n\nWould you like to change it?")
                    or _("The default (★) for newly opened books is left-to-right (LTR) page turning.\n\nWould you like to change it?"),
                    choice1_text_func = function()
                        return inverse_reading_order and _("LTR") or _("LTR (★)")
                    end,
                    choice1_callback = function()
                        G_reader_settings:makeFalse("inverse_reading_order")
                        if touchmenu_instance then touchmenu_instance:updateItems() end
                    end,
                    choice2_text_func = function()
                        return inverse_reading_order and _("RTL (★)") or _("RTL")
                    end,
                    choice2_callback = function()
                        G_reader_settings:makeTrue("inverse_reading_order")
                        if touchmenu_instance then touchmenu_instance:updateItems() end
                    end,
                })
            end,
        },
        {
            text = _("Also invert document-related dialogs"),
            checked_func = function()
                return G_reader_settings:isTrue("invert_ui_layout_mirroring")
            end,
            enabled_func = function()
                return ReaderUI.instance.view.inverse_reading_order
            end,
            callback = function()
                G_reader_settings:flipNilOrFalse("invert_ui_layout_mirroring")
            end,
            help_text = _([[
When enabled the UI direction for the Table of Contents, Book Map, and Page Browser dialogs will follow the page turn direction instead of the default UI direction.]]),
            separator = true,
        }
    }
}

return PageTurns