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core.docview

View for editing documents with syntax highlighting and text editing. Extends View to provide text editing capabilities including selection, scrolling, IME support, and rendering with syntax highlighting.

local docview = require "core.docview"

__index​

(field) __index: core.object

Base class providing OOP functionality for Lua. All classes in Pragtical inherit from Object.

cache_font​

(field) cache_font: renderer.font

cache_font_size​

(field) cache_font_size: number

cache_indent_size​

(field) cache_indent_size: integer

context​

(field) context: string

current_scale​

(field) current_scale: number

cursor​

(field) cursor: string

doc​

(field) doc: core.doc

font​

(field) font: string

h_scrollbar​

(field) h_scrollbar: core.scrollbar

Scrollable viewport indicator with draggable thumb. Supports both vertical and horizontal orientation with configurable alignment. Uses a "normal" coordinate system internally that treats all scrollbars as vertical-end-aligned, then transforms to the actual orientation/alignment.

hovered_scrollbar​

(field) hovered_scrollbar: boolean

hovering_gutter​

(field) hovering_gutter: boolean

ime_status​

(field) ime_status: boolean

last_col1​

(field) last_col1: integer

last_col2​

(field) last_col2: integer

last_line1​

(field) last_line1: integer

last_line2​

(field) last_line2: integer

last_x_offset​

(field) last_x_offset: core.docview.position

mouse_selecting​

(field) mouse_selecting: table?

scroll​

(field) scroll: core.view.scroll

scrollable​

(field) scrollable: boolean

size​

(field) size: core.view.position

super​

(field) super: core.view

Base view.

translate​

(field) translate: table

v_scrollbar​

(field) v_scrollbar: core.scrollbar

Scrollable viewport indicator with draggable thumb. Supports both vertical and horizontal orientation with configurable alignment. Uses a "normal" coordinate system internally that treats all scrollbars as vertical-end-aligned, then transforms to the actual orientation/alignment.

core.docview.ime_selection​

from​

(field) from: integer

size​

(field) size: integer

core.docview.position​

col​

(field) col: integer

line​

(field) line: integer

offset​

(field) offset: number

__call​

(method) core.object:__call(...any)
  -> obj: core.object

Metamethod allowing class to be called like a constructor. Enables syntax: local obj = MyClass(args) instead of MyClass:new(args) Automatically creates instance and calls new() with provided arguments.

@return obj — The new instance of the class

__tostring​

(method) core.docview:__tostring()
  -> string

clamp_scroll_position​

(method) core.view:clamp_scroll_position()

Clamp scroll position to valid range (0 to max scrollable size). Called automatically by update(). Override get_scrollable_size() to customize.

draw​

(method) core.docview:draw()

Draw the entire document view. Renders background, gutters, text, selections, carets, and scrollbars.

draw_background​

(method) core.view:draw_background(color: renderer.color)

Draw a solid background color for the entire view. Commonly called at the start of draw() methods.

draw_caret​

(method) core.docview:draw_caret(x: number, y: number, line: integer, col: integer)

Draw the caret at a position.

@param x — Screen x coordinate

@param y — Screen y coordinate

@param line — Line number (for overwrite mode char width)

@param col — Column number (for overwrite mode char width)

draw_ime_decoration​

(method) core.docview:draw_ime_decoration(line1: integer, col1: integer, line2: integer, col2: integer)

Draw IME composition decoration (underline and selection).

@param line1 — Start line

@param col1 — Start column

@param line2 — End line

@param col2 — End column

draw_line_body​

(method) core.docview:draw_line_body(line: integer, x: number, y: number)
  -> height: integer

Draw a complete line including highlight and selections.

@param line — Line number

@param x — Screen x coordinate

@param y — Screen y coordinate

@return height — Line height

draw_line_gutter​

(method) core.docview:draw_line_gutter(line: integer, x: number, y: number, width: number)
  -> height: integer

Draw the gutter with line numbers.

@param line — Line number

@param x — Screen x coordinate

@param y — Screen y coordinate

@param width — Gutter width

@return height — Line height

draw_line_highlight​

(method) core.docview:draw_line_highlight(x: number, y: number)

Draw the current line highlight bar.

@param x — Screen x coordinate

@param y — Screen y coordinate

draw_line_text​

(method) core.docview:draw_line_text(line: integer, x: number, y: number)
  -> height: integer

Draw the text content of a line with syntax highlighting.

@param line — Line number

@param x — Screen x coordinate

@param y — Screen y coordinate

@return height — Line height

draw_overlay​

(method) core.docview:draw_overlay()

Draw overlay elements (carets, IME decoration). Called after main text to draw on top.

draw_scrollbar​

(method) core.view:draw_scrollbar()

Draw the view's scrollbars. Commonly called at the end of draw() methods.

extend​

(method) core.object:extend()
  -> cls: core.object

Create a new class that inherits from this one. Returns a new class with this class as its parent. Example: local MyClass = Object:extend()

@return cls — The new class table

extends​

(method) core.object:extends(T: any)
  -> extends: boolean

Check if object inherits from the given type (inheritance-aware). Use this to check class hierarchy. Example: view:extends(View) returns true for View and all subclasses

@param T — Class to check inheritance from

@return extends — True if object is T or inherits from T

get_col_x_offset​

(method) core.docview:get_col_x_offset(line: integer, col: integer)
  -> offset: number

Get the horizontal pixel offset for a column position. Accounts for tabs, syntax highlighting fonts, and caches long lines.

@param line — Line number

@param col — Column number (byte offset)

@return offset — Horizontal pixel offset

get_content_bounds​

(method) core.view:get_content_bounds()
  -> x1: number
  2. y1: number
  3. x2: number
  4. y2: number

Get the content bounds in content coordinates (accounting for scroll).

@return x1 — Left edge

@return y1 — Top edge

@return x2 — Right edge

@return y2 — Bottom edge

get_content_offset​

(method) core.view:get_content_offset()
  -> x: number
  2. y: number

Get the top-left corner of content area in screen coordinates. Accounts for scroll offset. Use for drawing content at correct position.

@return x — Screen x coordinate

@return y — Screen y coordinate

get_filename​

(method) core.docview:get_filename()
  -> filename: string

Get the full filename path for display (with home directory encoded).

@return filename — Full path or name with asterisk if modified

get_font​

(method) core.docview:get_font()
  -> font: renderer.font

Get the font used for rendering text.

@return font — The code font

get_gutter_width​

(method) core.docview:get_gutter_width()
  -> width: number
  2. padding: number

Get the gutter width (line numbers area).

@return width — Total gutter width

@return padding — Padding within gutter

get_h_scrollable_size​

(method) core.docview:get_h_scrollable_size()
  -> width: number

Get the scrollable width (infinite for horizontal scrolling).

@return width — Always returns math.huge

get_line_height​

(method) core.docview:get_line_height()
  -> height: integer

Get the line height in pixels.

@return height — Line height including line spacing

get_line_screen_position​

(method) core.docview:get_line_screen_position(line: integer, col?: integer)
  -> x: number
  2. y: number

Get the screen position of a line (and optionally column).

@param line — Line number

@param col — Optional column number

@return x — Screen x coordinate

@return y — Screen y coordinate

get_line_text_y_offset​

(method) core.docview:get_line_text_y_offset()
  -> offset: number

Get the vertical offset for centering text within a line.

@return offset — Y offset to center text in line height

get_name​

(method) core.docview:get_name()
  -> name: string

Get the display name for the tab (filename with * if dirty).

@return name — Document name with asterisk if modified

get_scrollable_size​

(method) core.docview:get_scrollable_size()
  -> height: number

Get the total scrollable height of the document.

@return height — Total height in pixels

get_visible_cols_range​

(method) core.docview:get_visible_cols_range(line: integer, extra_cols?: integer)
  -> col1: integer
  2. col2: integer
  3. ucol1: integer
  4. ucol2: integer

Get an estimated range of visible columns. It is an estimate because fonts and their fallbacks may not be monospaced or may differ in size. This function provides a way of optimization on really long lines for plugins that perform drawing operations on them.

It is good practice to set the extra_cols parameter to a value that leaves room for the differences in font sizes.

@param extra_cols — Amount of columns to deduce on col1 and include on col2 (default: 100)

get_visible_line_range​

(method) core.docview:get_visible_line_range()
  -> minline: integer
  2. maxline: integer

Get the range of visible lines in the current viewport.

@return minline — First visible line

@return maxline — Last visible line

get_x_offset_col​

(method) core.docview:get_x_offset_col(line: integer, x: number)
  -> col: integer

Get the column at a horizontal pixel offset. Inverse of get_col_x_offset. Accounts for variable-width fonts.

@param line — Line number

@param x — Horizontal pixel offset

@return col — Column number (byte offset)

is​

(method) core.object:is(T: any)
  -> is_exact: boolean

Check if object is exactly of the given type (no inheritance check). Use this for strict type matching. Example: view:is(DocView) returns true only if view is a DocView, not a subclass

@param T — Class to check against

@return is_exact — True if object is exactly type T

is_class_of​

(method) core.object:is_class_of(T: any)
  -> is_instance: boolean

Check if the given object is exactly an instance of this class. Inverse of is() - checks if T is an instance of self. Example: DocView:is_class_of(obj) checks if obj is exactly a DocView

@param T — Object to check

@return is_instance — True if T is exactly an instance of this class

is_extended_by​

(method) core.object:is_extended_by(T: any)
  -> is_extended: boolean

Check if the given object/class inherits from this class. Inverse of extends() - checks if T is a subclass of self. Example: View:is_extended_by(DocView) checks if DocView inherits from View

@param T — Object or class to check

@return is_extended — True if T inherits from this class

mouse_selection​

(method) core.docview:mouse_selection(doc: core.doc, snap_type: string, line1: integer, col1: integer, line2: integer, col2: integer)
  -> line1: integer
  2. col1: integer
  3. line2: integer
  4. col2: integer

Adjust selection based on snap type (word, line).

@param doc — Document

@param snap_type — Snap type: "word" or "lines"

@param line1 — Start line

@param col1 — Start column

@param line2 — End line

@param col2 — End column

@return line1 — Adjusted start line

@return col1 — Adjusted start column

@return line2 — Adjusted end line

@return col2 — Adjusted end column

move_towards​

(method) core.view:move_towards(t: table, k: string|number, dest: number, rate?: number, name?: string)

Smoothly animate a value towards a destination. Use this for animations instead of direct assignment.

@param t — Table containing the value

@param k — Key in table

@param dest — Target value

@param rate — Animation speed (0-1, default 0.5, higher = faster)

@param name — Transition name (for config.disabled_transitions)

new​

(method) core.docview:new(doc: core.doc)

Constructor - initializes a document view.

@param doc — Document to display

on_file_dropped​

(method) core.view:on_file_dropped(filename: string, x: number, y: number)
  -> consumed: boolean

Handle file drop events (drag and drop from OS). Override to handle dropped files. Return true to consume event.

@param filename — Absolute path to dropped file

@param x — Screen x where file was dropped

@param y — Screen y where file was dropped

@return consumed — True to consume event, false to propagate

on_ime_text_editing​

(method) core.docview:on_ime_text_editing(text: string, start: integer, length: integer)

Handle IME text composition events. Updates IME decoration and scrolls to keep composition visible.

@param text — Composition text

@param start — Selection start within composition

@param length — Selection length within composition

on_mouse_left​

(method) core.view:on_mouse_left()

Called when mouse leaves the view's area. Override to clear hover states. Base implementation notifies scrollbars.

on_mouse_moved​

(method) core.docview:on_mouse_moved(x: number, y: number, ...any)

Handle mouse movement for cursor changes and text selection. Updates cursor icon, gutter hover state, and extends selection if dragging.

@param x — Screen x coordinate

@param y — Screen y coordinate

on_mouse_pressed​

(method) core.docview:on_mouse_pressed(button: 'left'|'right', x: number, y: number, clicks: integer)
  -> handled: boolean?

Handle mouse press for text selection and gutter clicks. Supports single/double click, shift-selection, and gutter line selection.

@param x — Screen x coordinate

@param y — Screen y coordinate

@param clicks — Number of clicks

@return handled — True if event was handled

button:
    | 'left'
    | 'right'

on_mouse_released​

(method) core.docview:on_mouse_released(...any)

Handle mouse release to end text selection.

on_mouse_wheel​

(method) core.view:on_mouse_wheel(y: number, x: number)
  -> consumed: boolean?

Handle mouse wheel scroll events. Override for custom scroll behavior. Base implementation does nothing.

@param y — Vertical scroll delta; positive is "up"

@param x — Horizontal scroll delta; positive is "left"

@return consumed — True to consume event

on_scale_change​

(method) core.view:on_scale_change(new_scale: number, prev_scale: number)

Called when DPI scale changes (display moved, zoom changed, etc.). Override to adjust sizes, padding, or other scale-dependent values.

@param new_scale — New scale factor (e.g., 1.0, 1.5, 2.0)

@param prev_scale — Previous scale factor

on_text_input​

(method) core.docview:on_text_input(text: string)

Handle text input from keyboard.

@param text — Input text

on_touch_moved​

(method) core.view:on_touch_moved(x: number, y: number, dx: number, dy: number, i: number)

Handle touch move events (touchscreen/trackpad gestures). Override for touch-specific behavior. Base implementation handles scrolling.

@param x — Current touch x coordinate

@param y — Current touch y coordinate

@param dx — Delta x since last position

@param dy — Delta y since last position

@param i — Touch finger/pointer index

resolve_screen_position​

(method) core.docview:resolve_screen_position(x: number, y: number)
  -> line: integer
  2. col: integer

Convert screen coordinates to document line/column.

@param x — Screen x coordinate

@param y — Screen y coordinate

@return line — Line number

@return col — Column number

scroll_to_line​

(method) core.docview:scroll_to_line(line: integer, ignore_if_visible?: boolean, instant?: boolean)

Scroll to center a line in the viewport.

@param line — Line number to scroll to

@param ignore_if_visible — Don't scroll if line already visible

@param instant — Jump immediately without animation

scroll_to_make_visible​

(method) core.docview:scroll_to_make_visible(line: integer, col: integer, instant?: boolean)

Scroll to make a position visible with context padding. Ensures the position is visible with surrounding context lines.

@param line — Line number

@param col — Column number

@param instant — Jump immediately without animation

scrollbar_dragging​

(method) core.view:scrollbar_dragging()
  -> dragging: boolean

Check if user is currently dragging either scrollbar.

@return dragging — True if scrollbar drag is in progress

scrollbar_hovering​

(method) core.view:scrollbar_hovering()
  -> hovering: boolean

Check if mouse is hovering over either scrollbar track.

@return hovering — True if mouse is over scrollbar

scrollbar_overlaps_point​

(method) core.view:scrollbar_overlaps_point(x: number, y: number)
  -> overlaps: boolean

Check if a screen point overlaps either scrollbar. Useful for determining cursor style or handling clicks.

@param x — Screen x coordinate

@param y — Screen y coordinate

@return overlaps — True if point is over vertical or horizontal scrollbar

supports_text_input​

(method) core.docview:supports_text_input()
  -> accepts: boolean

Check if this view accepts text input.

@return accepts — Always returns true for DocView

try_close​

(method) core.docview:try_close(do_close: function)

Attempt to close the view, prompting to save if document is dirty. Shows "Unsaved Changes" dialog if this is the last view of a dirty document.

@param do_close — Callback to execute when close is confirmed

update​

(method) core.docview:update()

Update the view state each frame. Handles cache invalidation, auto-scrolling to caret, and blink timing.

update_ime_location​

(method) core.docview:update_ime_location()

Update IME composition window location. Sets the bounding box for the system IME composition window.

update_scrollbar​

(method) core.view:update_scrollbar()

Update scrollbar positions and sizes. Called automatically by update(). Rarely needs to be called manually.