### QuickStart:isShown()

Source: https://koreader.rocks/doc/modules/ui.quickstart.html

Checks if the quickstart guide has been shown to the user.

```APIDOC
## QuickStart:isShown()

### Description
Returns true if the quickstart guide has been shown, false if it hasn't been shown yet or if display is forced through a higher version number.

### Returns
- **boolean** - true if shown, false otherwise.
```

--------------------------------

### QuickStart:getQuickStart()

Source: https://koreader.rocks/doc/modules/ui.quickstart.html

Generates the quickstart guide in the user's language.

```APIDOC
## QuickStart:getQuickStart()

### Description
Generates the quickstart guide in the user's language and returns its file system location.

### Returns
- **string** - The path to the generated HTML quickstart guide.
```

--------------------------------

### IconWidget Initialization

Source: https://koreader.rocks/doc/modules/ui.widget.iconwidget.html

Example of how to instantiate and display an IconWidget.

```APIDOC
## IconWidget:new

### Description
Creates a new instance of an IconWidget to display an icon from the resources/icons directory.

### Parameters
- **icon** (string) - Required - The name of the icon file (excluding extension) located in resources/icons.
- **dim** (boolean) - Optional - Whether to dim the icon.
- **alpha** (boolean) - Optional - Whether to enable transparency on the icon (defaults to false).

### Usage Example
```lua
local IconWidget = require("ui/widget/iconwidget")
local icon_widget = IconWidget:new{
    icon = "check",
    dim = true,
    alpha = true
}
UIManager:show(icon_widget)
```
```

--------------------------------

### Initialize gettext and pluralization

Source: https://koreader.rocks/doc/modules/gettext.html

Standard setup for gettext and pluralization helpers using ffi/util template.

```lua
local _ = require("gettext")           -- gettext()
local C_ = _.pgettext                  -- pgettext()
local N_ = _.ngettext                  -- ngettext()
local NC_ = _.npgettext                -- npgettext()
local T = require("ffi/util").template -- ffi.util.template()

-- The most common use case with regular gettext().
local simple_string = _("item")

-- A more complex example. The correct plural form will be automatically
-- selected by ngettext() based on the number.
local numbered_string = T(N_("1 item", "%1 items", num_items), num_items)
```

--------------------------------

### Initialize and Calculate Sun Times

Source: https://koreader.rocks/doc/modules/suntime.html

Basic setup sequence for configuring a location and calculating solar events.

```lua
local SunTime = require("suntime")

time_zone = 0
altitude = 50
degree = true
SunTime:setPosition("Reykjavik", 64.14381, -21.92626, timezone, altitude, degree)

SunTime:setAdvanced()

SunTime:setDate()

SunTime:calculateTimes()

print(SunTime.rise, SunTime.set, SunTime.set_civil) -- or similar see calculateTime()
```

--------------------------------

### stringStartsWith(str, start)

Source: https://koreader.rocks/doc/modules/util.html

Checks if a string starts with a specific substring.

```APIDOC
## stringStartsWith(str, start)

### Description
Checks if a string starts with the provided substring.

### Parameters
- **str** (string) - Required - The source string.
- **start** (string) - Required - The string to match.

### Returns
- (bool) - Returns true on success.
```

--------------------------------

### KoptInterface:getCoverPageImage

Source: https://koreader.rocks/doc/modules/document.koptinterface.html

Get first page image.

```APIDOC
## KoptInterface:getCoverPageImage(doc)

### Description
Get first page image.

### Parameters
- **doc** - The document object.
```

--------------------------------

### DepGraph Usage

Source: https://koreader.rocks/doc/modules/depgraph.html

Example of how to initialize a dependency graph, add nodes with dependencies, and serialize the result.

```APIDOC
## DepGraph

### Description
Library for constructing dependency graphs. Insertion order is preserved, and duplicates are automatically prevented for both main nodes and dependencies.

### Usage Example
```lua
local dg = DepGraph:new{}
dg:addNode('a1', {'a2', 'b1'})
dg:addNode('b1', {'a2', 'c1'})
dg:addNode('c1')
-- The return value of dg:serialize() will be:
-- {'a2', 'c1', 'b1', 'a1'}
```
```

--------------------------------

### Measuring duration with time module

Source: https://koreader.rocks/doc/modules/time.html

Demonstrates capturing a start time, calculating a duration, and converting the result to milliseconds.

```lua
local time = require("ui/time")

local start_time = time.now()
-- Do some stuff.
-- You can add and subtract `fts times` objects
local duration = time.now() - start_time
-- and convert that object to various more human-readable formats, e.g.,
print(string.format("Stuff took %.3fms", time.to_ms(duration)))

local offset = time.s(100)
print(string.format("Stuff plus 100s took %.3fms", time.to_ms(duration + offset)))
```

--------------------------------

### Initialize Geom Objects

Source: https://koreader.rocks/doc/modules/ui.geometry.html

Examples of initializing Geom objects for full rectangles, points, and dimensions.

```lua
local Geom = require("ui/geometry")
Geom:new{ x = 1, y = 0, w = Screen:scaleBySize(100), h = Screen:scaleBySize(200), }
```

```lua
Geom:new{ x = 0, y = 0, }
```

```lua
Geom:new{ w = Screen:scaleBySize(600), h = Screen:scaleBySize(800), }
```

--------------------------------

### Measure elapsed time using realtime

Source: https://koreader.rocks/doc/modules/time.html

Demonstrates capturing a start time and calculating the duration using the realtime clock.

```lua
local time = require("ui/time")
local fts_start = time.realtime()
-- Do some stuff.
-- You can add and subtract fts times
local fts_duration = time.realtime() - fts_start
```

--------------------------------

### KoptInterface:getWordFromPosition

Source: https://koreader.rocks/doc/modules/document.koptinterface.html

Get word and word box from document position.

```APIDOC
## KoptInterface:getWordFromPosition(doc, pos)

### Description
Get word and word box from `doc` position.

### Parameters
- **doc** - The document object.
- **pos** - The position.
```

--------------------------------

### CheckButton Usage

Source: https://koreader.rocks/doc/modules/ui.widget.checkbutton.html

Example of how to instantiate and display a CheckButton widget within a parent container.

```APIDOC
## CheckButton Widget

### Description
The CheckButton widget is a UI component that displays a checkmark when active and an empty box when inactive. It is typically used for boolean settings or selection toggles.

### Usage Example
```lua
local CheckButton = require("ui/widget/CheckButton")
local parent_widget = OverlapGroup:new{}
table.insert(parent_widget, CheckButton:new{
    text = _("Show password"),
    callback = function() end,
})
UIManager:show(parent_widget)
```
```

--------------------------------

### Registering Custom Dictionary Buttons

Source: https://koreader.rocks/doc/modules/ui.widget.dictquicklookup.html

Example of registering a custom dictionary button within a plugin, utilizing dynamic labels and callbacks.

```lua
function MyPlugin:registerDictButtons()
    if self.ui and self.ui.dictionary then
        self.ui.dictionary:addToDictButtons({
            id = "my_custom_action",
            menu_text = _("My custom action"),
            text_func = function(dict_popup)
                return dict_popup._my_custom_action_state and _("Disable action") or _("Enable action")
            end,
            insert_first = true,
            show_func = function(dict_popup)
                return true -- or some condition based on dict_popup
            end,
            callback = function(dict_popup)
                local current = dict_popup._my_custom_action_state == true
                dict_popup._my_custom_action_state = not current
            end,
        })
    end
end
```

--------------------------------

### Adding a submenu

Source: https://koreader.rocks/doc/modules/dispatcher.html

Example usage of the addSubMenu function to integrate a submenu into the dispatcher.

```lua
Dispatcher:addSubMenu(self, sub_items, self.data, "profile1")
```

--------------------------------

### Example debug log output

Source: https://koreader.rocks/doc/topics/Hacking.md.html

The format of log entries generated by the logger module.

```text
 04/06/17-21:44:53 DEBUG foo
```

--------------------------------

### KoptInterface:getNativeTextBoxesFromScratch

Source: https://koreader.rocks/doc/modules/document.koptinterface.html

Get text boxes in native page via optical method.

```APIDOC
## KoptInterface:getNativeTextBoxesFromScratch(doc, pageno)

### Description
Get text boxes in native page via optical method. Done by OCR pre-processing in Tesseract and Leptonica.

### Parameters
- **doc** - The document object.
- **pageno** - The page number.
```

--------------------------------

### Implement Preset Management in a Module

Source: https://koreader.rocks/doc/modules/ui.presets.html

Demonstrates the full lifecycle of integrating the preset system, including object initialization, method implementation, menu generation, and dispatcher integration.

```lua
local Presets = require("ui/presets")

-- 1. In your module's init() method, set up a preset object:
    self.preset_obj = {
        presets = G_reader_settings:readSetting("my_module_presets", {}),             -- or custom storage
        cycle_index = G_reader_settings:readSetting("my_module_presets_cycle_index"), -- optional, only needed if cycling through presets
        dispatcher_name = "load_my_module_preset",                                    -- must match dispatcher.lua entry
        saveCycleIndex = function(this)                                               -- Save cycle index to persistent storage
            G_reader_settings:saveSetting("my_module_presets_cycle_index", this.cycle_index)
        end,
        buildPreset = function() return self:buildPreset() end,                       -- Closure to build a preset from current state
        loadPreset = function(preset) self:loadPreset(preset) end,                    -- Closure to apply a preset to the module
    }

-- 2. Implement required methods in your module:
    function MyModule:buildPreset()
        return {
            -- Return a table with the settings you want to save in the preset
            setting1 = self.setting1,
            setting2 = self.setting2,
            enabled_features = self.enabled_features,
        }
    end

    function MyModule:loadPreset(preset) {
        -- Apply the preset settings to your module
        self.setting1 = preset.setting1
        self.setting2 = preset.setting2
        self.enabled_features = preset.enabled_features
        -- Update UI or perform other necessary changes
        self:refresh()
    }

-- 3. Create menu items for presets: (Alternatively, you could call Presets.genPresetMenuItemTable directly from touchmenu_instance)
    function MyModule:genPresetMenuItemTable(touchmenu_instance)
        return Presets.genPresetMenuItemTable(
            self.preset_obj,                                 -- preset object
            _("Create new preset from current settings"),    -- optional: custom text for UI menu
            function() return self:hasValidSettings() end,   -- optional: function to enable/disable creating presets
        )
    end

-- 4. Load a preset by name (for dispatcher/event handling):
    function MyModule:onLoadMyModulePreset(preset_name)
        return Presets.onLoadPreset(
            self.preset_obj,
            preset_name,
            true  -- show notification
        )
    end

-- 5. Cycle through presets (for dispatcher/event handling):
    function MyModule:onCycleMyModulePresets()
        return Presets.cycleThroughPresets(
            self.preset_obj,
            true  -- show notification
        )
    end

-- 6. Get list of available presets (for dispatcher):
    function MyModule.getPresets() -- Note: This is a static method on MyModule
        local config = {
            presets = G_reader_settings:readSetting("my_module_presets", {})
        }
        return Presets.getPresets(config)
    end

-- 7. Add to dispatcher.lua:
    load_my_module_preset = {
        category = "string",
        event = "LoadMyModulePreset",
        title = _("Load my module preset"),
        args_func = MyModule.getPresets,
        reader = true
    },
    cycle_my_module_preset = {
        category = "none",
        event = "CycleMyModulePresets",
        title = _("Cycle through my module presets"),
        reader = true
    },
```

--------------------------------

### Example Linux Kernel MT Protocol B Events

Source: https://koreader.rocks/doc/modules/device.input.html

Example of events for a single tap motion from the Linux kernel using MT protocol B.

```text
MT_TRACK_ID: 0
MT_X: 222
MT_Y: 207
SYN REPORT
MT_TRACK_ID: -1
SYN REPORT
```

--------------------------------

### Button Initialization

Source: https://koreader.rocks/doc/modules/ui.widget.button.html

How to instantiate and configure a new button widget.

```APIDOC
## Button Initialization

### Description
Creates a new instance of a button widget with specified text, state, and callback behavior.

### Usage
```lua
local Button = require("ui/widget/button")
local button = Button:new{
    text = _("Press me!"),
    enabled = false, -- defaults to true
    callback = some_callback_function,
    width = Screen:scaleBySize(50),
    bordersize = Screen:scaleBySize(3),
    margin = 0,
    padding = Screen:scaleBySize(2),
}
```
```

--------------------------------

### KoptInterface:getPageDimensions

Source: https://koreader.rocks/doc/modules/document.koptinterface.html

Get page dimensions.

```APIDOC
## KoptInterface:getPageDimensions(doc, pageno, zoom, rotation)

### Description
Get page dimensions.

### Parameters
- **doc** - The document object.
- **pageno** - The page number.
- **zoom** - Zoom level.
- **rotation** - Rotation angle.
```

--------------------------------

### getScreenHeight()

Source: https://koreader.rocks/doc/modules/android.html

Gets the current screen height.

```APIDOC
## getScreenHeight()

### Description
Gets the screen height.

### Returns
- **screen height** (int) - The height of the screen in pixels.
```

--------------------------------

### Initialize and use CacheSQLite

Source: https://koreader.rocks/doc/modules/cachesqlite.html

Demonstrates creating a new cache instance with a specified size and file path, followed by basic insertion and retrieval operations.

```lua
local CacheSQLite = require("cachesqlite")
local cache = CacheSQLite:new{
    size = 1024 * 1024 * 10, -- 10 MB
    -- Set to :memory: for an in-memory database.
    -- In that case, set auto_close to false.
    db_path = "/path/to/cache.db",
}
cache:insert("key", {value = "data"})
local data = cache:check("key")
```

--------------------------------

### Run UI widget builder

Source: https://koreader.rocks/doc/topics/Hacking.md.html

Execute the wbuilder tool to bootstrap the UI framework for rapid widget development.

```bash
 ./kodev wbuilder
```

--------------------------------

### getScreenWidth()

Source: https://koreader.rocks/doc/modules/android.html

Gets the current screen width.

```APIDOC
## getScreenWidth()

### Description
Gets the screen width.

### Returns
- **screen width** (int) - The width of the screen in pixels.
```

--------------------------------

### Initialize and display a CheckMark widget

Source: https://koreader.rocks/doc/modules/ui.widget.checkmark.html

Demonstrates how to require the CheckMark module, instantiate it within a container, and display it using the UIManager.

```lua
local CheckMark = require("ui/widget/CheckMark")
local parent_widget = FrameContainer:new{}
table.insert(parent_widget, CheckMark:new{
    checkable = false, -- shows nothing when false, defaults to true
    checked = function() end, -- whether the box has a checkmark in it
})
UIManager:show(parent_widget)
```

--------------------------------

### Initialize and display the network setting widget

Source: https://koreader.rocks/doc/modules/ui.widget.networksetting.html

This snippet demonstrates how to define a list of networks and initialize the network setting widget with connection and disconnection callbacks.

```lua
local network_list = {
    {
        ssid = "foo",
        signal_level = -58,
        flags = "[WPA2-PSK-CCMP][ESS]",
        signal_quality = 84,
        password = "123abc",
        connected = true,
    },
    {
        ssid = "bar",
        signal_level = -258,
        signal_quality = 44,
        flags = "[WEP][ESS]",
    },
}
UIManager:show(require("ui/widget/networksetting"):new{
    network_list = network_list,
    connect_callback = function()
        -- connect_callback will be called when a *connect* (NOT disconnect)
        -- attempt has been successful.
        -- You can update UI widgets in the callback.
    end,
    disconnect_callback = function()
        -- This one will fire unconditionally after a disconnect attempt.
    end,
})
```

--------------------------------

### KoptInterface:getRFPageDimensions

Source: https://koreader.rocks/doc/modules/document.koptinterface.html

Get reflowed page dimensions.

```APIDOC
## KoptInterface:getRFPageDimensions(doc, pageno, zoom, rotation)

### Description
Get reflowed page dimensions.

### Parameters
- **doc** - The document object.
- **pageno** - The page number.
- **zoom** - Zoom level.
- **rotation** - Rotation angle.
```

--------------------------------

### Widget:new

Source: https://koreader.rocks/doc/modules/ui.widget.widget.html

Initiates an instance of a widget class and calls the init method.

```APIDOC
## Widget:new(o)

### Description
Use this method to initiate an instance of a class. Do NOT use it for class definitions because it also calls self:init().

### Parameters
- **o** (table) - The table to be initialized as an instance.

### Returns
- **Widget** - The initialized widget instance.
```

--------------------------------

### getFilesystemType(path)

Source: https://koreader.rocks/doc/modules/util.html

Gets the filesystem type of a given path.

```APIDOC
## getFilesystemType(path)

### Description
Gets the filesystem type of a path by checking `/proc/mounts`.

### Parameters
- **path** (string) - Required - An absolute path.

### Returns
- **string** - The filesystem type.
```

--------------------------------

### KoptInterface:getLinkFromPosition

Source: https://koreader.rocks/doc/modules/document.koptinterface.html

Get link from position in screen page.

```APIDOC
## KoptInterface:getLinkFromPosition(doc, pageno, pos)

### Description
Get link from position in screen page.

### Parameters
- **doc** - The document object.
- **pageno** - The page number.
- **pos** - The position.
```

--------------------------------

### Initialize and display a TextViewer

Source: https://koreader.rocks/doc/modules/ui.widget.textviewer.html

Create a new TextViewer instance with a title and text, then register it with the UIManager to render it on screen.

```lua
local textviewer = TextViewer:new{
    title = _("I can scroll!"),
    text = _("I'll need to be longer than this example to scroll."),
}
UIManager:show(textviewer)
```

--------------------------------

### KoptInterface:getNativeOCRWord

Source: https://koreader.rocks/doc/modules/document.koptinterface.html

Get word from OCR in native page.

```APIDOC
## KoptInterface:getNativeOCRWord(doc, pageno, rect)

### Description
Get word from OCR in native page.

### Parameters
- **doc** - The document object.
- **pageno** - The page number.
- **rect** - The rectangle area.
```

--------------------------------

### init()

Source: https://koreader.rocks/doc/modules/koplugin.japanese.deinflector.html

Initializes a Deflector instance with rules from yomichan-deflect.json.

```APIDOC
## init()

### Description
Initializes a Deflector instance using the set of rules defined in the yomichan-deflect.json file.
```

--------------------------------

### Initialize and display a RadioButtonWidget

Source: https://koreader.rocks/doc/modules/ui.widget.radiobuttonwidget.html

Demonstrates how to define a list of radio button options and display the widget using UIManager with a callback function.

```lua
local RadioButtonWidget = require("ui/widget/radiobuttonwidget")

local radio_buttons = {
    { {text = _("Radio 1"), provider = 1} },
    { {text = _("Radio 2"), provider = 2, checked = true} },
    { {text = _("Radio 3"), provider = "identifier"} },
}
UIManager:show(RadioButtonWidget:new{
    title_text = _("Example Title"),
    info_text = _("Some more information"),
    cancel_text = _("Close"),
    ok_text = _("Apply"),
    width_factor = 0.9,
    radio_buttons = radio_buttons,
    callback = function(radio)
        if radio.provider == 1 then
            -- do something here
        elseif radio.provider == 2 then
            -- do some other things here
        elseif radio.provider == "identifier" then
            -- or do a third thing here
        end
    end,
})
```

--------------------------------

### KoptInterface:getReflewOCRWord

Source: https://koreader.rocks/doc/modules/document.koptinterface.html

Get word from OCR in reflowed page.

```APIDOC
## KoptInterface:getReflewOCRWord(doc, pageno, rect)

### Description
Get word from OCR in reflowed page.

### Parameters
- **doc** - The document object.
- **pageno** - The page number.
- **rect** - The rectangle area.
```

--------------------------------

### KoptInterface:getCachedContext

Source: https://koreader.rocks/doc/modules/document.koptinterface.html

Get cached koptcontext for a certain page.

```APIDOC
## KoptInterface:getCachedContext(doc, pageno)

### Description
Get cached koptcontext for a certain page. If the context doesn't exist in cache, make a new context and reflow the src page immediately, or wait for the background thread with reflowed context.

### Parameters
- **doc** - The document object.
- **pageno** - The page number.
```

--------------------------------

### ProgressbarDialog:new

Source: https://koreader.rocks/doc/modules/ui.widget.progressbardialog.html

Initializes a new ProgressbarDialog instance.

```APIDOC
## ProgressbarDialog:new

### Description
Creates a new instance of the ProgressbarDialog.

### Parameters
- **title** (string) - Optional - The title of the dialog.
- **subtitle** (string) - Optional - The subtitle of the dialog.
- **progress_max** (number) - Optional - The maximum value for the progress bar.
- **refresh_time_seconds** (number) - Optional - The interval in seconds to refresh the UI.
```

--------------------------------

### Initialize DataStorage module

Source: https://koreader.rocks/doc/modules/datastorage.html

Load the datastorage module to access directory path utility functions.

```lua
local DataStorage = require("datastorage")
```

--------------------------------

### KoptInterface:createContext

Source: https://koreader.rocks/doc/modules/document.koptinterface.html

Get reflow context for a specific page.

```APIDOC
## KoptInterface:createContext(doc, pageno, bbox)

### Description
Get reflow context. Koptcontext keeps track of its dst bitmap reflowed by libk2pdfopt.

### Parameters
- **doc** - The document object.
- **pageno** - The page number.
- **bbox** - The bounding box.
```

--------------------------------

### lastIndexOf(string, ch)

Source: https://koreader.rocks/doc/modules/util.html

Gets the last index of a character in a string.

```APIDOC
## lastIndexOf(string, ch)

### Description
Gets the last index of a character in a string (similar to strrchr). To find a dot (.), it must be escaped.

### Parameters
- **string** (string) - Required - The string to search.
- **ch** (string) - Required - The character to find.

### Returns
- **int** - The index of the last occurrence or -1 if not found.
```

--------------------------------

### Using ui.size Constants

Source: https://koreader.rocks/doc/modules/ui.size.html

Demonstrates how to import the ui.size module and apply its predefined constants to widget properties like radius, bordersize, padding, and margin.

```APIDOC
## Using ui.size Constants

### Description
Import the `ui.size` module to access standardized dimension constants for consistent UI layout.

### Usage Example
```lua
local Size = require("ui/size")
local frame -- example widget
frame = FrameContainer:new{
    radius = Size.radius.window,
    bordersize = Size.border.window,
    padding = Size.padding.default,
    margin = Size.margin.default,
    VerticalGroup:new{
        -- widget content
    }
}
```
```

--------------------------------

### Initialize and display a ProgressWidget

Source: https://koreader.rocks/doc/modules/ui.widget.progresswidget.html

Create a new progress bar instance with specific dimensions and an initial percentage, then display it using the UIManager.

```lua
local foo_bar = ProgressWidget:new{
    width = Screen:scaleBySize(400),
    height = Screen:scaleBySize(10),
    percentage = 50/100,
}
UIManager:show(foo_bar)
```

--------------------------------

### migrate(key, title, help, info, the, folder_only, new_file)

Source: https://koreader.rocks/doc/modules/koplugin.coverimage.html

Creates a menu entry for setting a reader setting key for a path or file.

```APIDOC
## migrate(key, title, help, info, the, folder_only, new_file)

### Description
Provides a menu entry to configure a specific G_reader setting key for a path or file selection.

### Parameters
- **key** (string) - The G_reader setting key to be updated.
- **title** (string) - The title shown in the menu.
- **help** (string) - The help text shown in the menu.
- **info** (string) - The info text shown in the menu (use %1 to display the current key value).
- **the** (string) - The default value.
- **folder_only** (boolean) - If true, only folders can be selected.
- **new_file** (boolean) - If true, a new filename can be entered.
```

--------------------------------

### KoptInterface:getTextFromBoxes

Source: https://koreader.rocks/doc/modules/document.koptinterface.html

Get text and text boxes between two positions.

```APIDOC
## KoptInterface:getTextFromBoxes(boxes, pos0, pos1)

### Description
Get text and text boxes between `pos0` and `pos1`.

### Parameters
- **boxes** - The boxes collection.
- **pos0** - The start position.
- **pos1** - The end position.
```

--------------------------------

### KoptInterface:getWordFromBoxes

Source: https://koreader.rocks/doc/modules/document.koptinterface.html

Get word and word box around position.

```APIDOC
## KoptInterface:getWordFromBoxes(boxes, pos)

### Description
Get word and word box around `pos`.

### Parameters
- **boxes** - The boxes collection.
- **pos** - The position.
```

--------------------------------

### CacheSQLite:get

Source: https://koreader.rocks/doc/modules/cachesqlite.html

Retrieves an object without updating access time.

```APIDOC
## CacheSQLite:get(key)

### Description
Retrieves an object if it is in the cache without updating its access time.

### Parameters
- **key** (string) - Required

### Returns
- **any** - The cached object
```

--------------------------------

### LuaData:open

Source: https://koreader.rocks/doc/modules/luadata.html

Creates a new LuaData instance.

```APIDOC
## LuaData:open(file_path, name)

### Description
Creates a new LuaData instance.

### Parameters
- **file_path** - Required - The path to the data file.
- **name** - Optional - Backwards compatibility parameter.
```

--------------------------------

### Initialize and display an InputDialog

Source: https://koreader.rocks/doc/modules/ui.widget.inputdialog.html

Create a new InputDialog instance with custom title, input hint, and button callbacks, then display it using the UIManager.

```lua
local InputDialog = require("ui/widget/inputdialog")
local UIManager = require("ui/uimanager")
local logger = require("logger")
local _ = require("gettext")

local sample_input
sample_input = InputDialog:new{
    title = _("Dialog title"),
    input = "default value",
    -- A placeholder text shown in the text box.
    input_hint = _("Hint text"),
    -- input_type = nil, -- default for text
    -- A description shown above the input.
    description = _("Some more description."),
    -- text_type = "password",
    buttons = {
        {
            {
                text = _("Cancel"),
                id = "close",
                callback = function()
                    UIManager:close(sample_input)
                end,
            },
            {
                text = _("Save"),
                -- button with is_enter_default set to true will be
                -- triggered after user press the enter key from keyboard
                is_enter_default = true,
                callback = function()
                    logger.dbg("Got user input as raw text:", sample_input:getInputText())
                    logger.dbg("Got user input as value:", sample_input:getInputValue())
                end,
            },
        }
    },
}
UIManager:show(sample_input)
sample_input:onShowKeyboard()
```

--------------------------------

### KoptInterface:getWordFromNativePosition

Source: https://koreader.rocks/doc/modules/document.koptinterface.html

Get word and word box from position in native page.

```APIDOC
## KoptInterface:getWordFromNativePosition(doc, boxes, pos)

### Description
Get word and word box from position in native page.

### Parameters
- **doc** - The document object.
- **boxes** - The boxes collection.
- **pos** - The position.
```

--------------------------------

### Initialize and display an IconWidget

Source: https://koreader.rocks/doc/modules/ui.widget.iconwidget.html

Create a new instance of IconWidget by specifying the icon name and optional rendering properties, then display it using the UIManager.

```lua
local IconWidget = require("ui/widget/iconwidget")
local icon_widget = IconWidget:new{
    icon = "check", -- Which corresponds to resources/icons/mdlight/check.svg
    dim = true,
    alpha = true
}
UIManager:show(icon_widget)
```

--------------------------------

### KoptInterface:getWordFromReflowPosition

Source: https://koreader.rocks/doc/modules/document.koptinterface.html

Get word and word box from position in reflowed page.

```APIDOC
## KoptInterface:getWordFromReflowPosition(doc, boxes, pos)

### Description
Get word and word box from position in reflowed page.

### Parameters
- **doc** - The document object.
- **boxes** - The boxes collection.
- **pos** - The position.
```

--------------------------------

### Initialize a ListView widget

Source: https://koreader.rocks/doc/modules/ui.widget.listview.html

Create a new ListView instance with defined dimensions, a page update callback, and a collection of child widgets.

```lua
local list_view = ListView:new{
    height = Screen:scaleBySize(400),
    width = Screen:scaleBySize(200),
    page_update_cb = function(curr_page_num, total_pages)
        -- This callback function will be called whenever a page
        -- turn event is triggered. You can use it to update
        -- information on the parent widget.
    end,
    items = {
        FrameContainer:new{
            bordersize = 0,
            background = Blitbuffer.COLOR_WHITE,
            TextWidget:new{
                text = "foo",
                face = Font:getFace("cfont"),
            }
        },
        FrameContainer:new{
            bordersize = 0,
            background = Blitbuffer.COLOR_LIGHT_GRAY,
            TextWidget:new{
                text = "bar",
                face = Font:getFace("cfont"),
            }
        },
        -- You can add as many widgets as you want here...
    }
}
```

--------------------------------

### Input:open

Source: https://koreader.rocks/doc/modules/device.input.html

Opens an input device by path.

```APIDOC
## Input:open(path, name)

### Description
Wrapper for our Lua/C input module's open.

### Parameters
- **path** (string) - Required - The path to the device.
- **name** (string) - Optional - Used for logging purposes.
```

--------------------------------

### KoptInterface:getOCRText

Source: https://koreader.rocks/doc/modules/document.koptinterface.html

Get text from OCR providing selected text boxes.

```APIDOC
## KoptInterface:getOCRText(doc, pageno, tboxes)

### Description
Get text from OCR providing selected text boxes.

### Parameters
- **doc** - The document object.
- **pageno** - The page number.
- **tboxes** - The text boxes.
```

--------------------------------

### KoptInterface:getOCRWord

Source: https://koreader.rocks/doc/modules/document.koptinterface.html

Get word from OCR providing selected word box.

```APIDOC
## KoptInterface:getOCRWord(doc, pageno, wbox)

### Description
Get word from OCR providing selected word box.

### Parameters
- **doc** - The document object.
- **pageno** - The page number.
- **wbox** - The word box.
```

--------------------------------

### LuaDefaults:open

Source: https://koreader.rocks/doc/modules/luadefaults.html

Opens a settings file at the specified path.

```APIDOC
## LuaDefaults:open(path)

### Description
Opens a settings file.

### Parameters
- **path** - The file path to open.
```

--------------------------------

### KoptInterface:getNativeTextBoxes

Source: https://koreader.rocks/doc/modules/document.koptinterface.html

Get text boxes in native page via rectmaps.

```APIDOC
## KoptInterface:getNativeTextBoxes(doc, pageno)

### Description
Get text boxes in native page via rectmaps in koptcontext.

### Parameters
- **doc** - The document object.
- **pageno** - The page number.
```

--------------------------------

### KeyValuePage Initialization

Source: https://koreader.rocks/doc/modules/ui.widget.keyvaluepage.html

How to instantiate and display a KeyValuePage widget with custom data and callbacks.

```APIDOC
## KeyValuePage:new

### Description
Creates a new instance of the KeyValuePage widget to display a list of key-value pairs.

### Parameters
- **title** (string) - The title displayed at the top of the page.
- **kv_pairs** (table) - A list of items to display. Items can be a table of two strings for key-value pairs, a string containing dashes for a separator, or a table with a callback function for interactive elements.

### Example
```lua
local Foo = KeyValuePage:new{
    title = "Statistics",
    kv_pairs = {
        {"Current period", "00:00:00"},
        "----------------------------",
        {"Page to read", "5"},
        {"Time to read", "00:01:00"},
        {"Press me", "will invoke the callback",
         callback = function() print("hello") end },
    },
}
UIManager:show(Foo)
```
```

--------------------------------

### KoptInterface:getReflowedTextBoxes

Source: https://koreader.rocks/doc/modules/document.koptinterface.html

Get text boxes in reflowed page via rectmaps.

```APIDOC
## KoptInterface:getReflowedTextBoxes(doc, pageno)

### Description
Get text boxes in reflowed page via rectmaps in koptcontext.

### Parameters
- **doc** - The document object.
- **pageno** - The page number.
```

--------------------------------

### Input:open

Source: https://koreader.rocks/doc/modules/device.input.html

Opens an input device by path and name.

```APIDOC
## Input:open(path, name)

### Description
Wrapper for the Lua/C input module's open function to initialize an input device.

### Parameters
- **path** (string) - The file system path to the input device.
- **name** (string) - The name identifier for the input device.
```

--------------------------------

### LuaData:append

Source: https://koreader.rocks/doc/modules/luadata.html

Appends settings to disk.

```APIDOC
## LuaData:append(data)

### Description
Appends settings to disk.

### Parameters
- **data** - Required - The data to append.
```

--------------------------------

### Initialize and display a TextBoxWidget

Source: https://koreader.rocks/doc/modules/ui.widget.textboxwidget.html

Create a new instance of TextBoxWidget with a specified font and text content, then display it using the UIManager.

```lua
local Foo = TextBoxWidget:new{
    face = Font:getFace("cfont", 25),
    text = 'We can show multiple lines.\nFoo.\nBar.',
    -- width = math.floor(Screen:getWidth() * 2/3),
}
UIManager:show(Foo)
```

--------------------------------

### KoptInterface:getPageBlock

Source: https://koreader.rocks/doc/modules/document.koptinterface.html

Get page regions in native page via optical method.

```APIDOC
## KoptInterface:getPageBlock(doc, pageno, x, y)

### Description
Get page regions in native page via optical method.

### Parameters
- **doc** - The document object.
- **pageno** - The page number.
- **x** - X coordinate.
- **y** - Y coordinate.
```

--------------------------------

### Initialize and display a KeyValuePage

Source: https://koreader.rocks/doc/modules/ui.widget.keyvaluepage.html

Create a new KeyValuePage instance with a title and a list of key-value pairs, then display it using UIManager.

```lua
local Foo = KeyValuePage:new{
    title = "Statistics",
    kv_pairs = {
        {"Current period", "00:00:00"},
        -- single or more "-" will generate a solid line
        "----------------------------",
        {"Page to read", "5"},
        {"Time to read", "00:01:00"},
        {"Press me", "will invoke the callback",
         callback = function() print("hello") end },
    },
}
UIManager:show(Foo)
```

--------------------------------

### Initialize a Button Widget

Source: https://koreader.rocks/doc/modules/ui.widget.button.html

Create a new button instance by requiring the module and passing configuration parameters to the new method.

```lua
local Button = require("ui/widget/button")
local button = Button:new{
    text = _("Press me!"),
    enabled = false, -- defaults to true
    callback = some_callback_function,
    width = Screen:scaleBySize(50),
    bordersize = Screen:scaleBySize(3),
    margin = 0,
    padding = Screen:scaleBySize(2),
}
```

--------------------------------

### KoptInterface:getReflowedTextBoxesFromScratch

Source: https://koreader.rocks/doc/modules/document.koptinterface.html

Get text boxes in reflowed page via optical method.

```APIDOC
## KoptInterface:getReflowedTextBoxesFromScratch(doc, pageno)

### Description
Get text boxes in reflowed page via optical method. Done by OCR pre-processing in Tesseract and Leptonica.

### Parameters
- **doc** - The document object.
- **pageno** - The page number.
```

--------------------------------

### Constructing and serializing a dependency graph

Source: https://koreader.rocks/doc/modules/depgraph.html

Demonstrates how to initialize a new DepGraph, add nodes with their dependencies, and serialize the resulting graph.

```lua
local dg = DepGraph:new{}
dg:addNode('a1', {'a2', 'b1'})
dg:addNode('b1', {'a2', 'c1'})
dg:addNode('c1')
-- The return value of dg:serialize() will be:
-- {'a2', 'c1', 'b1', 'a1'}
```

--------------------------------

### ui.widget.networksetting

Source: https://koreader.rocks/doc/modules/ui.widget.networksetting.html

Initializes and displays the network setting widget with a list of networks and associated callbacks.

```APIDOC
## ui.widget.networksetting

### Description
Displays a network management widget that lists available networks and provides callbacks for connection and disconnection events.

### Usage
```lua
UIManager:show(require("ui/widget/networksetting"):new{
    network_list = network_list,
    connect_callback = function() -- Called on successful connection attempt
    end,
    disconnect_callback = function() -- Called after a disconnect attempt
    end,
})
```

### Parameters
- **network_list** (table) - Required - A list of network objects, each containing:
    - **ssid** (string) - The network name.
    - **signal_level** (number) - The signal strength in dBm.
    - **signal_quality** (number) - The signal quality percentage.
    - **flags** (string) - Security flags (e.g., [WPA2-PSK-CCMP]).
    - **password** (string) - Optional password for the network.
    - **connected** (boolean) - Optional connection status.
- **connect_callback** (function) - Optional - Callback triggered upon a successful connection.
- **disconnect_callback** (function) - Optional - Callback triggered after a disconnection attempt.
```

--------------------------------

### InputDialog:new

Source: https://koreader.rocks/doc/modules/ui.widget.inputdialog.html

Creates a new instance of an InputDialog with specified configuration options.

```APIDOC
## InputDialog:new(options)

### Description
Creates and configures a new InputDialog widget instance.

### Parameters
- **options** (table) - Required - Configuration table containing:
  - **title** (string) - Dialog title
  - **input** (string) - Default input value
  - **input_hint** (string) - Placeholder text
  - **description** (string) - Description text shown above the input
  - **buttons** (table) - List of button configurations
  - **fullscreen** (boolean) - Enable full-screen mode
  - **allow_newline** (boolean) - Allow multi-line input
  - **save_callback** (function) - Callback for save action
  - **reset_callback** (function) - Callback for reset action
```

--------------------------------

### Display a MultiConfirmBox

Source: https://koreader.rocks/doc/modules/ui.widget.multiconfirmbox.html

Shows how to instantiate and display a MultiConfirmBox with custom text and callback functions for two distinct choices.

```lua
UIManager:show(MultiConfirmBox:new{
    text = T( _("Set %1 as fallback font?"), face),
    choice1_text = _("Default"),
    choice1_callback = function()
        -- set as default font
    end,
    choice2_text = _("Fallback"),
    choice2_callback = function()
        -- set as fallback font
    end,
})
```

--------------------------------

### Initialize WakeupMgr instance

Source: https://koreader.rocks/doc/modules/device.wakeupmgr.html

Create a new instance of the WakeupMgr, optionally specifying the RTC device path if the default /dev/rtc0 is not appropriate.

```lua
local WakeupMgr = require("device/wakeupmgr")
local wakeup_mgr = WakeupMgr:new{
    -- The default is /dev/rtc0, but some devices have more than one RTC.
    -- You might therefore need to use /dev/rtc1, etc.
    dev_rtc = "/dev/rtc0",
}
```

--------------------------------

### Basic Logging Usage

Source: https://koreader.rocks/doc/modules/logger.html

Initialize the logger and record messages at different severity levels.

```lua
local logger = require("logger")
logger.info("Something happened.")
logger.err("House is on fire!")
```

--------------------------------

### Set Dirty Region for Repaint

Source: https://koreader.rocks/doc/modules/ui.uimanager.html

Examples of triggering a widget repaint with different refresh types and optional geometry regions.

```lua
UIManager:setDirty(self.widget, "partial")
UIManager:setDirty(self.widget, "partial", Geom:new{x=10,y=10,w=100,h=50})
UIManager:setDirty(self.widget, function() return "ui", self.someelement.dimen end)
```

--------------------------------

### LuaSettings:open

Source: https://koreader.rocks/doc/modules/luasettings.html

Opens a settings file for reading and writing.

```APIDOC
## LuaSettings:open(file_path)

### Description
Opens a settings file.

### Parameters
- **file_path** (string) - Required - The path to the settings file.
```

--------------------------------

### Initialize ProgressbarDialog

Source: https://koreader.rocks/doc/modules/ui.widget.progressbardialog.html

Create a new instance of the progress bar dialog. Ensure at least one of title, subtitle, or progress_max is provided.

```lua
local progressbar_dialog = ProgressbarDialog:new {
    title = nil,
    subtitle = nil,
    progress_max = nil
    refresh_time_seconds = 3,
}
```

--------------------------------

### Initialize and display a CheckButton

Source: https://koreader.rocks/doc/modules/ui.widget.checkbutton.html

Demonstrates how to require the CheckButton module, instantiate it within a parent container, and display it using the UIManager.

```lua
local CheckButton = require("ui/widget/CheckButton")
local parent_widget = OverlapGroup:new{}
table.insert(parent_widget, CheckButton:new{
    text = _("Show password"),
    callback = function() end,
})
UIManager:show(parent_widget)
```

--------------------------------

### Using ui.size constants in a widget

Source: https://koreader.rocks/doc/modules/ui.size.html

Demonstrates how to import the ui.size module and apply its predefined constants to widget properties like radius, bordersize, padding, and margin.

```lua
local Size = require("ui/size")
local frame -- just an example widget
frame = FrameContainer:new{
    radius = Size.radius.window,
    bordersize = Size.border.window,
    padding = Size.padding.default,
    margin = Size.margin.default,
    VerticalGroup:new{
        -- etc
    }
}
```

--------------------------------

### Registering an action at runtime

Source: https://koreader.rocks/doc/modules/dispatcher.html

Demonstrates how to register a new action with the dispatcher using the registerAction method.

```lua
function Hello:onDispatcherRegisterActions()
    Dispatcher:registerAction("helloworld_action", {category="none", event="HelloWorld", title=_("Hello World"), general=true})
end

function Hello:init()
    self:onDispatcherRegisterActions()
end
```

--------------------------------

### NumberPickerWidget:new

Source: https://koreader.rocks/doc/modules/ui.widget.numberpickerwidget.html

Initializes a new NumberPickerWidget instance with specific configuration options.

```APIDOC
## NumberPickerWidget:new

### Description
Creates a new instance of the NumberPickerWidget.

### Parameters
- **precision** (string) - Optional - Format string for the number (e.g., "%02d" for integers, "%.2f" for decimals).
- **value** (number) - Optional - Initial value.
- **value_min** (number) - Optional - Minimum allowed value.
- **value_max** (number) - Optional - Maximum allowed value.
- **value_step** (number) - Optional - Increment/decrement step size.
- **value_hold_step** (number) - Optional - Step size when holding the button.
- **wrap** (boolean) - Optional - Whether the value wraps around at min/max boundaries.
```

--------------------------------

### Configure full screen text editor options

Source: https://koreader.rocks/doc/modules/ui.widget.inputdialog.html

Set these properties in the InputDialog configuration to enable full screen editing mode.

```lua
fullscreen = true, -- No need to provide any height and width.
condensed = true,
allow_newline = true,
cursor_at_end = false,
-- and one of these:
add_scroll_buttons = true,
add_nav_bar = true,
```

--------------------------------

### UIManager:run

Source: https://koreader.rocks/doc/modules/ui.uimanager.html

The main loop of the UI controller.

```APIDOC
## UIManager:run()

### Description
This is the main loop of the UI controller, managing input events and delegating them to dialogs.
```

--------------------------------

### SQLite3 Database Operations in Lua

Source: https://koreader.rocks/doc/topics/DataStore.md.html

Demonstrates opening a connection, executing SQL commands, using prepared statements, and querying data using the lua-ljsqlite3 library.

```lua
local SQ3 = require("lua-ljsqlite3/init")

local conn = SQ3.open("/path/to/database.sqlite3")

-- Execute SQL commands separated by the ';' character:
conn:exec([[
-- time is in unit of seconds
CREATE TABLE IF NOT EXISTS page_read_time(page INTEGER, time INTEGER);
CREATE TABLE IF NOT EXISTS book_property(title TEXT, author TEXT, language TEXT);
]])

-- Prepared statements are supported, with this you can bind different values
-- to the same statement. Let's set the read time for the first 10 pages in the
-- book to 5 seconds
local stmt = conn:prepare("INSERT INTO page_read_time VALUES(?, ?)")
for i=1,10 do
  stmt:reset():bind(i, 5):step()
end

-- Now we can retrieve all read time stats for the first 10 pages:
local results = conn:exec("SELECT * FROM page_read_time") -- Records are by column.
-- Access to results via column numbers or names:
assert(results[1] == results.page)
assert(results[2] == results.time)
-- Nested indexing corresponds to the record(row) number, access value for 4th page:
assert(results[1][4] == 4)
assert(results[2][4] == 5)
-- access value for 2nd page:
assert(results.page[2] == 2)
assert(results.time[2] == 5)

-- Convenience function returns multiple values for one record:
local page, time = conn:rowexec("SELECT * FROM page_read_time WHERE page==3")
print(page, time) --> 3 5

-- We can also use builtin aggregate functions to do simple analytic task
local total_time = conn:rowexec("SELECT SUM(time) FROM page_read_time")
print(total_time) --> 50

conn:close() -- Do not forget to close stmt after you are done
```

--------------------------------

### Initialize a NumberPickerWidget

Source: https://koreader.rocks/doc/modules/ui.widget.numberpickerwidget.html

Create a new instance of the number picker with specific constraints such as range, step size, and display precision.

```lua
local NumberPickerWidget = require("ui/widget/numberpickerwidget")
local numberpicker = NumberPickerWidget:new{
    -- for floating point (decimals), use something like "%.2f"
    precision = "%02d",
    value = 0,
    value_min = 0,
    value_max = 23,
    value_step = 1,
    value_hold_step = 4,
    wrap = true,
}
```

--------------------------------

### Verify Remote Configuration

Source: https://koreader.rocks/doc/topics/Collaborating_with_Git.md.html

Displays the currently configured remote repositories.

```bash
git remote -v show
```

--------------------------------

### VocabBuilder:init

Source: https://koreader.rocks/doc/modules/koplugin.vocabbuilder.html

Initializes the VocabBuilder plugin and adds the corresponding item to the main menu.

```APIDOC
## VocabBuilder:init()

### Description
Initializes the VocabBuilder plugin. This function is responsible for adding the VocabBuilder item to the main menu of the application.

### Signature
`VocabBuilder:init()`
```

--------------------------------

### Accessing child settings

Source: https://koreader.rocks/doc/modules/luasettings.html

Demonstrates how to save a table of settings and access them as a child object.

```lua
Settings:saveSetting("key", {
    a = "b",
    c = true,
    d = false,
})

local child = Settings:child("key")

child:readSetting("a")
-- result "b"
```

--------------------------------

### Iterate over widgets

Source: https://koreader.rocks/doc/modules/ui.uimanager.html

Note that VirtualKeyboard can be instantiated multiple times and is a modal, so multiple instances may appear at the top of the stack.

```lua
so don't be surprised if you find a couple of instances of it at the top ;).
```

--------------------------------

### Initialize AlphaContainer

Source: https://koreader.rocks/doc/modules/ui.widget.container.alphacontainer.html

Create an AlphaContainer instance with a defined opacity and a child widget.

```lua
local alpha
alpha = AlphaContainer:new{
    alpha = 0.7,

    FrameContainer:new{
        background = Blitbuffer.COLOR_WHITE,
        bordersize = Size.border.default,
        margin = 0,
        padding = Size.padding.default
    }
}
```