TextEditor

A backend for text editors. It implements the common textbox editing options, but is both rendering and input agnostic.

Keyboard input must be translated into operations like editor.delete(.right, .word) to emulate what a typical text box implementation would do when CTRL DELETE is pressed.

For mouse input, the editor component needs to be made aware about the font that is used. For this, an abstract font interface is required.

API

const TextEditor = @import("src/TextEditor.zig");

fn init(TextEditor.Buffer, initial_text: []const u8) InsertError!TextEditor {
fn deinit(*TextEditor) void;
fn setText(*TextEditor, text: []const u8) InsertError!void;
fn getText(TextEditor) []const u8;
fn getSubString(editor: TextEditor, start: usize, length: ?usize) []const u8;
fn setCursor(*TextEditor, offset: usize) SetCursorError!void;
fn moveCursor(*TextEditor, direction: EditDirection, unit: EditUnit) void;
fn delete(*TextEditor, direction: EditDirection, unit: EditUnit) void;
fn insertText(*TextEditor, text: []const u8) InsertError!void;
fn graphemeCount(TextEditor) usize;

Common Key Mappings

Keyboard Input	Editor Call
Left	editor.moveCursor(.left, .letter)
Right	editor.moveCursor(.right, .letter)
Ctrl+Left	editor.moveCursor(.left, .word)
Ctrl+Right	editor.moveCursor(.right, .word)
Home	editor.moveCursor(.left, .line)
End	editor.moveCursor(.right, .line)
Backspace	editor.delete(.left, .letter)
Delete	editor.delete(.right, .letter)
Ctrl+Backspace	editor.delete(.left, .word)
Ctrl+Delete	editor.delete(.right, .word)
text input	try editor.insert("string")