From b092ef65e9099668a543b32f978a9e09201e4074 Mon Sep 17 00:00:00 2001
From: Adrian Wozniak <adrian.wozniak@ita-prog.pl>
Date: Fri, 4 Jan 2019 10:40:29 +0100
Subject: [PATCH] Add text

---
 src/app/app_state.rs                     |  88 ++++++-
 src/app/keyboard_handler.rs              | 281 +++++++++++++++++++++++
 src/app/mod.rs                           |  32 ++-
 src/main.rs                              |   1 -
 src/ui/caret.rs                          |  44 +++-
 src/{ => ui}/file/editor_file.rs         |  30 ++-
 src/{ => ui}/file/editor_file_section.rs |  15 +-
 src/{ => ui}/file/editor_file_token.rs   |  19 +-
 src/{ => ui}/file/mod.rs                 |   0
 src/ui/mod.rs                            |  21 +-
 src/ui/text_character.rs                 |  27 ++-
 11 files changed, 519 insertions(+), 39 deletions(-)
 create mode 100644 src/app/keyboard_handler.rs
 rename src/{ => ui}/file/editor_file.rs (76%)
 rename src/{ => ui}/file/editor_file_section.rs (85%)
 rename src/{ => ui}/file/editor_file_token.rs (86%)
 rename src/{ => ui}/file/mod.rs (100%)

diff --git a/src/app/app_state.rs b/src/app/app_state.rs
index f9e7144..de3b62d 100644
--- a/src/app/app_state.rs
+++ b/src/app/app_state.rs
@@ -1,7 +1,7 @@
 use crate::app::{UpdateResult, WindowCanvas};
 use crate::config::Config;
-use crate::file::*;
-use crate::file::editor_file::EditorFile;
+use crate::ui::file::*;
+use crate::ui::file::editor_file::EditorFile;
 use crate::renderer::Renderer;
 use crate::ui::*;
 use crate::ui::caret::Caret;
@@ -10,6 +10,7 @@ use sdl2::rect::Point;
 use std::boxed::Box;
 use std::rc::Rc;
 use std::sync::Arc;
+use sdl2::rect::Rect;
 
 pub struct AppState {
     menu_bar: MenuBar,
@@ -40,6 +41,85 @@ impl AppState {
     pub fn caret(&mut self) -> &mut Caret {
         &mut self.caret
     }
+
+    pub fn delete_front(&mut self, config: &Config) {
+        let file: &mut EditorFile = if let Some(file) = self.files.get_mut(self.current_file) {
+            file
+        } else {
+            return;
+        };
+        let mut buffer: String = file.buffer();
+        let caret: &mut Caret = &mut self.caret;
+        let position: usize = caret.text_position();
+        if position == 0 {
+            return;
+        }
+        buffer.remove(position);
+        match file.get_character_at(position - 1) {
+            Some(character) => {
+                let dest: &Rect = character.dest();
+                caret.move_caret(position - 1, Point::new(
+                    dest.x(), dest.y(),
+                ));
+            }
+            _ => {
+                caret.reset_caret();
+            }
+        }
+        let new_file = EditorFile::new(
+            file.path(),
+            buffer,
+            config,
+        );
+        self.files[self.current_file] = new_file;
+    }
+
+    pub fn delete_back(&mut self, config: &Config) {
+        let file: &mut EditorFile = if let Some(file) = self.files.get_mut(self.current_file) {
+            file
+        } else {
+            return;
+        };
+        let mut buffer: String = file.buffer();
+        let caret: &mut Caret = &mut self.caret;
+        let position: usize = caret.text_position();
+        if position >= buffer.len() {
+            return;
+        }
+        buffer.remove(position);
+        let new_file = EditorFile::new(
+            file.path(),
+            buffer,
+            config,
+        );
+        self.files[self.current_file] = new_file;
+    }
+
+    pub fn insert_character(&mut self, character: char, renderer: &mut Renderer) {
+        let file: &mut EditorFile = if let Some(file) = self.files.get_mut(self.current_file) {
+            file
+        } else {
+            return;
+        };
+        let mut buffer: String = file.buffer();
+        let caret: &mut Caret = &mut self.caret;
+        let position: usize = caret.text_position();
+        buffer.insert(position, character.clone());
+        let new_file = EditorFile::new(
+            file.path(),
+            buffer,
+            renderer.config(),
+        );
+        if let Some(rect) = get_text_character_rect(character, renderer) {
+            if let Some(current) = file.get_character_at(position) {
+                caret.move_caret(position + 1, Point::new(
+                    current.dest().x() + rect.width() as i32,
+                    current.dest().y(),
+                ));
+            }
+        }
+        self.files[self.current_file] = new_file;
+    }
 }
 
 impl Render for AppState {
@@ -72,8 +152,8 @@ impl ClickHandler for AppState {
         if let Some(current_file) = self.files.get_mut(self.current_file) {
             if current_file.is_left_click_target(point) {
                 match current_file.on_left_click(point, config) {
-                    UpdateResult::MoveCaret(rect) => {
-                        self.caret.move_caret(Point::new(rect.x(), rect.y()));
+                    UpdateResult::MoveCaret(rect, position) => {
+                        self.caret.move_caret(position, Point::new(rect.x(), rect.y()));
                     }
                     _ => (),
                 };
diff --git a/src/app/keyboard_handler.rs b/src/app/keyboard_handler.rs
new file mode 100644
index 0000000..0c50272
--- /dev/null
+++ b/src/app/keyboard_handler.rs
@@ -0,0 +1,281 @@
+use sdl2::keyboard::{Keycode, Scancode};
+use sdl2::event::EventPollIterator;
+use sdl2::EventPump;
+
+use crate::app::UpdateResult;
+
+pub fn resolve_action(key_code: Keycode, event_pump: &mut EventPump) -> UpdateResult {
+    match key_code {
+        Keycode::Backspace => return UpdateResult::DeleteFront,
+        Keycode::Delete => return UpdateResult::DeleteBack,
+
+        Keycode::Escape => return UpdateResult::NoOp,
+
+        Keycode::Space => {
+            let character: char = ' ';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Exclaim => {
+            let character: char = '!';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Quotedbl => {
+            let character: char = '"';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Hash => {
+            let character: char = '#';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Dollar => {
+            let character: char = '$';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Percent => {
+            let character: char = '%';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Ampersand => {
+            let character: char = '&';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Quote => {
+            let character: char = '\'';
+            return UpdateResult::Input(character);
+        }
+        Keycode::LeftParen => {
+            let character: char = '{';
+            return UpdateResult::Input(character);
+        }
+        Keycode::RightParen => {
+            let character: char = '}';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Asterisk => {
+            let character: char = '*';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Plus => {
+            let character: char = '+';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Comma => {
+            let character: char = ',';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Minus => {
+            let character: char = '-';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Period => {
+            let character: char = '.';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Slash => {
+            let character: char = '/';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Num0 => {
+            let character: char = '0';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Num1 => {
+            let character: char = '1';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Num2 => {
+            let character: char = '2';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Num3 => {
+            let character: char = '3';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Num4 => {
+            let character: char = '4';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Num5 => {
+            let character: char = '5';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Num6 => {
+            let character: char = '6';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Num7 => {
+            let character: char = '7';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Num8 => {
+            let character: char = '8';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Num9 => {
+            let character: char = '9';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Colon => {
+            let character: char = ':';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Semicolon => {
+            let character: char = ';';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Less => {
+            let character: char = '<';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Equals => {
+            let character: char = '=';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Greater => {
+            let character: char = '>';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Question => {
+            let character: char = '?';
+            return UpdateResult::Input(character);
+        }
+        Keycode::At => {
+            let character: char = '@';
+            return UpdateResult::Input(character);
+        }
+        Keycode::LeftBracket => {
+            let character: char = '[';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Backslash => {
+            let character: char = '\\';
+            return UpdateResult::Input(character);
+        }
+        Keycode::RightBracket => {
+            let character: char = ']';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Caret => {
+            let character: char = '^';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Underscore => {
+            let character: char = '_';
+            return UpdateResult::Input(character);
+        }
+        Keycode::Backquote => {
+            let character: char = '`';
+            return UpdateResult::Input(character);
+        }
+        Keycode::A => {
+            let character: char = if with_shift(event_pump) { 'A' } else { 'a' };
+            return UpdateResult::Input(character);
+        }
+        Keycode::B => {
+            let character: char = if with_shift(event_pump) { 'B' } else { 'b' };
+            return UpdateResult::Input(character);
+        }
+        Keycode::C => {
+            let character: char = if with_shift(event_pump) { 'C' } else { 'c' };
+            return UpdateResult::Input(character);
+        }
+        Keycode::D => {
+            let character: char = if with_shift(event_pump) { 'D' } else { 'd' };
+            return UpdateResult::Input(character);
+        }
+        Keycode::E => {
+            let character: char = if with_shift(event_pump) { 'E' } else { 'e' };
+            return UpdateResult::Input(character);
+        }
+        Keycode::F => {
+            let character: char = if with_shift(event_pump) { 'F' } else { 'f' };
+            return UpdateResult::Input(character);
+        }
+        Keycode::G => {
+            let character: char = if with_shift(event_pump) { 'G' } else { 'g' };
+            return UpdateResult::Input(character);
+        }
+        Keycode::H => {
+            let character: char = if with_shift(event_pump) { 'H' } else { 'h' };
+            return UpdateResult::Input(character);
+        }
+        Keycode::I => {
+            let character: char = if with_shift(event_pump) { 'I' } else { 'i' };
+            return UpdateResult::Input(character);
+        }
+        Keycode::J => {
+            let character: char = if with_shift(event_pump) { 'J' } else { 'j' };
+            return UpdateResult::Input(character);
+        }
+        Keycode::K => {
+            let character: char = if with_shift(event_pump) { 'K' } else { 'k' };
+            return UpdateResult::Input(character);
+        }
+        Keycode::L => {
+            let character: char = if with_shift(event_pump) { 'L' } else { 'l' };
+            return UpdateResult::Input(character);
+        }
+        Keycode::M => {
+            let character: char = if with_shift(event_pump) { 'M' } else { 'm' };
+            return UpdateResult::Input(character);
+        }
+        Keycode::N => {
+            let character: char = if with_shift(event_pump) { 'N' } else { 'n' };
+            return UpdateResult::Input(character);
+        }
+        Keycode::O => {
+            let character: char = if with_shift(event_pump) { 'O' } else { 'o' };
+            return UpdateResult::Input(character);
+        }
+        Keycode::P => {
+            let character: char = if with_shift(event_pump) { 'P' } else { 'p' };
+            return UpdateResult::Input(character);
+        }
+        Keycode::Q => {
+            let character: char = if with_shift(event_pump) { 'Q' } else { 'q' };
+            return UpdateResult::Input(character);
+        }
+        Keycode::R => {
+            let character: char = if with_shift(event_pump) { 'R' } else { 'r' };
+            return UpdateResult::Input(character);
+        }
+        Keycode::S => {
+            let character: char = if with_shift(event_pump) { 'S' } else { 's' };
+            return UpdateResult::Input(character);
+        }
+        Keycode::T => {
+            let character: char = if with_shift(event_pump) { 'T' } else { 't' };
+            return UpdateResult::Input(character);
+        }
+        Keycode::U => {
+            let character: char = if with_shift(event_pump) { 'U' } else { 'u' };
+            return UpdateResult::Input(character);
+        }
+        Keycode::V => {
+            let character: char = if with_shift(event_pump) { 'V' } else { 'v' };
+            return UpdateResult::Input(character);
+        }
+        Keycode::W => {
+            let character: char = if with_shift(event_pump) { 'W' } else { 'w' };
+            return UpdateResult::Input(character);
+        }
+        Keycode::X => {
+            let character: char = if with_shift(event_pump) { 'X' } else { 'x' };
+            return UpdateResult::Input(character);
+        }
+        Keycode::Y => {
+            let character: char = if with_shift(event_pump) { 'Y' } else { 'y' };
+            return UpdateResult::Input(character);
+        }
+        Keycode::Z => {
+            let character: char = if with_shift(event_pump) { 'Z' } else { 'z' };
+            return UpdateResult::Input(character);
+        }
+        _ => UpdateResult::NoOp
+    }
+}
+
+fn with_shift(event_pump: &mut EventPump) -> bool {
+    event_pump.keyboard_state().is_scancode_pressed(Scancode::LShift) ||
+    event_pump.keyboard_state().is_scancode_pressed(Scancode::RShift)
+}
diff --git a/src/app/mod.rs b/src/app/mod.rs
index 5a26d0b..dcb3851 100644
--- a/src/app/mod.rs
+++ b/src/app/mod.rs
@@ -3,9 +3,11 @@ use crate::config::Config;
 use crate::renderer::Renderer;
 use crate::themes::*;
 use crate::ui::*;
+
 use sdl2::{Sdl, TimerSubsystem};
 use sdl2::event::Event;
 use sdl2::EventPump;
+use sdl2::keyboard::{Keycode, Mod};
 use sdl2::hint;
 use sdl2::mouse::MouseButton;
 use sdl2::pixels::Color;
@@ -16,6 +18,7 @@ use std::thread::sleep;
 use std::time::Duration;
 
 pub mod app_state;
+pub mod keyboard_handler;
 
 pub type WindowCanvas = Canvas<Window>;
 
@@ -25,7 +28,10 @@ pub enum UpdateResult {
     Stop,
     RefreshPositions,
     MouseLeftClicked(Point),
-    MoveCaret(Rect),
+    MoveCaret(Rect, usize),
+    DeleteFront,
+    DeleteBack,
+    Input(char)
 }
 
 pub enum Task {
@@ -86,15 +92,24 @@ impl Application {
                 UpdateResult::Stop => break 'running,
                 UpdateResult::RefreshPositions => (),
                 UpdateResult::NoOp => (),
-                UpdateResult::MoveCaret(_) => (),
+                UpdateResult::MoveCaret(_, _pos) => (),
                 UpdateResult::MouseLeftClicked(point) => {
                     app_state.on_left_click(&point, renderer.config());
                 }
+                UpdateResult::DeleteFront => {
+                    app_state.delete_front(renderer.config());
+                },
+                UpdateResult::DeleteBack => {
+                    app_state.delete_back(renderer.config());
+                },
+                UpdateResult::Input(text_character) => {
+                    app_state.insert_character(text_character, &mut renderer);
+                },
             }
             for task in self.tasks.iter() {
                 match task {
                     Task::OpenFile { file_path } => {
-                        use crate::file::editor_file::*;
+                        use crate::ui::file::editor_file::*;
                         app_state.open_file(file_path.clone(), renderer.config());
                     }
                 }
@@ -134,6 +149,17 @@ impl Application {
                     MouseButton::Left => return UpdateResult::MouseLeftClicked(Point::new(x, y)),
                     _ => (),
                 },
+                Event::KeyDown { keycode, .. } => {
+                    let keycode = if keycode.is_some() {
+                        keycode.unwrap()
+                    } else {
+                        return UpdateResult::NoOp;
+                    };
+                    return keyboard_handler::resolve_action(
+                        keycode,
+                    event_pump
+                    );
+                }
                 _ => (),
             }
         }
diff --git a/src/main.rs b/src/main.rs
index 4ef6445..c68c3b3 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -15,7 +15,6 @@ use crate::app::Application;
 
 pub mod app;
 pub mod config;
-pub mod file;
 pub mod lexer;
 pub mod renderer;
 pub mod themes;
diff --git a/src/ui/caret.rs b/src/ui/caret.rs
index a2431a1..08eb7ae 100644
--- a/src/ui/caret.rs
+++ b/src/ui/caret.rs
@@ -14,12 +14,14 @@ enum CaretState {
 }
 
 pub struct Caret {
-    state: CaretState,
+    pending: bool,
+    text_position: usize,
     blink_delay: u8,
-    position: Rect,
+    state: CaretState,
+    dest: Rect,
+    reset_position: Rect,
     bright_character_color: Color,
     blur_character_color: Color,
-    pending: bool,
 }
 
 impl Caret {
@@ -29,7 +31,13 @@ impl Caret {
         Self {
             state: CaretState::Bright,
             blink_delay: 0,
-            position: Rect::new(
+            dest: Rect::new(
+                config.editor_left_margin(),
+                config.editor_top_margin(),
+                4,
+                0,
+            ),
+            reset_position: Rect::new(
                 config.editor_left_margin(),
                 config.editor_top_margin(),
                 4,
@@ -38,6 +46,7 @@ impl Caret {
             bright_character_color,
             blur_character_color,
             pending: true,
+            text_position: 0,
         }
     }
 
@@ -49,9 +58,19 @@ impl Caret {
         };
     }
 
-    pub fn move_caret(&mut self, pos: Point) {
-        self.position.set_x(pos.x());
-        self.position.set_y(pos.y());
+    pub fn reset_caret(&mut self) {
+        self.dest = self.reset_position.clone();
+        self.text_position = 0;
+    }
+
+    pub fn move_caret(&mut self, position: usize, pos: Point) {
+        self.text_position = position;
+        self.dest.set_x(pos.x());
+        self.dest.set_y(pos.y());
+    }
+
+    pub fn text_position(&self) -> usize {
+        self.text_position
     }
 }
 
@@ -68,14 +87,15 @@ impl Render for Caret {
                 })
                 .unwrap_or_else(|_| panic!("Unable to load font"));
             if let Ok((_, h)) = font.size_of_char('W') {
-                self.position.set_height(h);
+                self.dest.set_height(h);
+                self.reset_position = self.dest.clone();
             }
             self.pending = false;
         }
-        let start = Point::new(self.position.x(), self.position.y());
+        let start = Point::new(self.dest.x(), self.dest.y());
         let end = Point::new(
-            self.position.x(),
-            self.position.y() + self.position.height() as i32,
+            self.dest.x(),
+            self.dest.y() + self.dest.height() as i32,
         );
         let color = match self.state {
             CaretState::Bright => &self.bright_character_color,
@@ -107,6 +127,6 @@ impl ClickHandler for Caret {
     }
 
     fn is_left_click_target(&self, point: &Point) -> bool {
-        is_in_rect(point, &self.position)
+        is_in_rect(point, &self.dest)
     }
 }
diff --git a/src/file/editor_file.rs b/src/ui/file/editor_file.rs
similarity index 76%
rename from src/file/editor_file.rs
rename to src/ui/file/editor_file.rs
index 04ebb8e..bc74a40 100644
--- a/src/file/editor_file.rs
+++ b/src/ui/file/editor_file.rs
@@ -1,30 +1,52 @@
+use sdl2::rect::{Point, Rect};
+
 use crate::app::{UpdateResult, WindowCanvas};
 use crate::config::Config;
-use crate::file::editor_file_section::EditorFileSection;
+use crate::ui::file::editor_file_section::EditorFileSection;
 use crate::renderer::Renderer;
 use crate::ui::*;
-use sdl2::rect::{Point, Rect};
+use crate::ui::text_character::TextCharacter;
 
 #[derive(Clone)]
 pub struct EditorFile {
     path: String,
     sections: Vec<EditorFileSection>,
     render_position: Rect,
+    buffer: String,
 }
 
 impl EditorFile {
     pub fn new(path: String, buffer: String, config: &Config) -> Self {
-        let section = EditorFileSection::new(buffer, config);
-        let sections = vec![section];
+        let sections = vec![
+            EditorFileSection::new(buffer.clone(), config)
+        ];
         let x = config.editor_left_margin();
         let y = config.editor_top_margin();
         Self {
             path,
             sections,
             render_position: Rect::new(x, y, 0, 0),
+            buffer
         }
     }
 
+    pub fn buffer(&self) -> String {
+        self.buffer.clone()
+    }
+
+    pub fn path(&self) -> String {
+        self.path.clone()
+    }
+
+    pub fn get_character_at(&self, index: usize) -> Option<&TextCharacter> {
+        for section in self.sections.iter() {
+            if let Some(text_character) = section.get_character_at(index) {
+                return Some(text_character)
+            }
+        }
+        None
+    }
+
     fn refresh_characters_position(&mut self, config: &Config) {
         let mut current: Rect = self.render_position.clone();
         for section in self.sections.iter_mut() {
diff --git a/src/file/editor_file_section.rs b/src/ui/file/editor_file_section.rs
similarity index 85%
rename from src/file/editor_file_section.rs
rename to src/ui/file/editor_file_section.rs
index 44ec921..a00e8c7 100644
--- a/src/file/editor_file_section.rs
+++ b/src/ui/file/editor_file_section.rs
@@ -1,10 +1,12 @@
+use sdl2::rect::{Point, Rect};
+
 use crate::app::{UpdateResult, WindowCanvas};
 use crate::config::Config;
-use crate::file::editor_file_token::EditorFileToken;
+use crate::ui::file::editor_file_token::EditorFileToken;
 use crate::lexer::Language;
 use crate::renderer::Renderer;
 use crate::ui::*;
-use sdl2::rect::{Point, Rect};
+use crate::ui::text_character::TextCharacter;
 
 #[derive(Clone)]
 pub struct EditorFileSection {
@@ -31,6 +33,15 @@ impl EditorFileSection {
             c.update_position(current, config);
         }
     }
+
+    pub fn get_character_at(&self, index: usize) -> Option<&TextCharacter> {
+        for token in self.tokens.iter() {
+            if let Some(text_character) = token.get_character_at(index) {
+                return Some(text_character)
+            }
+        }
+        None
+    }
 }
 
 impl Render for EditorFileSection {
diff --git a/src/file/editor_file_token.rs b/src/ui/file/editor_file_token.rs
similarity index 86%
rename from src/file/editor_file_token.rs
rename to src/ui/file/editor_file_token.rs
index cd50be5..11cfbb9 100644
--- a/src/file/editor_file_token.rs
+++ b/src/ui/file/editor_file_token.rs
@@ -31,6 +31,15 @@ impl EditorFileToken {
         }
     }
 
+    pub fn get_character_at(&self, index: usize) -> Option<&TextCharacter> {
+        for character in self.characters.iter() {
+            if character.position() == index {
+                return Some(&character)
+            }
+        }
+        None
+    }
+
     fn update_view(&mut self, renderer: &mut Renderer) -> UpdateResult {
         let config = renderer.config().theme().code_highlighting();
         let color: Color = match self.token_type {
@@ -44,9 +53,13 @@ impl EditorFileToken {
             TokenType::Operator { .. } => config.operator().color().into(),
             TokenType::Separator { .. } => config.separator().color().into(),
         };
-        for c in self.token_type.text().chars() {
-            let mut text_character =
-                TextCharacter::new(c.clone(), self.token_type.line(), color.clone());
+        for (index, c) in self.token_type.text().chars().enumerate() {
+            let mut text_character = TextCharacter::new(
+                c.clone(),
+                self.token_type.start() + index,
+                self.token_type.line(),
+                color.clone()
+            );
             text_character.update_view(renderer);
             self.characters.push(text_character);
         }
diff --git a/src/file/mod.rs b/src/ui/file/mod.rs
similarity index 100%
rename from src/file/mod.rs
rename to src/ui/file/mod.rs
diff --git a/src/ui/mod.rs b/src/ui/mod.rs
index 576465a..620ef81 100644
--- a/src/ui/mod.rs
+++ b/src/ui/mod.rs
@@ -1,11 +1,14 @@
+use sdl2::rect::{Point, Rect};
+
 use crate::app::{UpdateResult, WindowCanvas};
 use crate::config::Config;
 use crate::renderer::Renderer;
-use sdl2::rect::{Point, Rect};
+use crate::renderer::managers::FontDetails;
 
 pub mod caret;
 pub mod menu_bar;
 pub mod text_character;
+pub mod file;
 
 pub fn is_in_rect(point: &Point, rect: &Rect) -> bool {
     let start = Point::new(rect.x(), rect.y());
@@ -16,6 +19,22 @@ pub fn is_in_rect(point: &Point, rect: &Rect) -> bool {
     start.x() <= point.x() && start.y() <= point.y() && end.x() >= point.x() && end.y() >= point.y()
 }
 
+pub fn get_text_character_rect(c: char, renderer: &mut Renderer) -> Option<Rect> {
+    let config = renderer.config().editor_config();
+    let font_details =
+        FontDetails::new(config.font_path().as_str(), config.character_size().clone());
+    let font = renderer
+        .font_manager()
+        .load(&font_details)
+        .unwrap_or_else(|_| panic!("Font not found {:?}", font_details));
+
+    if let Ok((width, height)) = font.size_of_char(c) {
+        Some(Rect::new(0, 0, width, height))
+    } else {
+        None
+    }
+}
+
 pub trait Render {
     fn render(&mut self, canvas: &mut WindowCanvas, renderer: &mut Renderer) -> UpdateResult;
 }
diff --git a/src/ui/text_character.rs b/src/ui/text_character.rs
index 69ae107..c009d60 100644
--- a/src/ui/text_character.rs
+++ b/src/ui/text_character.rs
@@ -5,8 +5,9 @@ use crate::renderer::managers::FontDetails;
 use crate::renderer::managers::TextDetails;
 use crate::renderer::Renderer;
 use crate::ui::*;
+
 use sdl2::pixels::Color;
-use sdl2::rect::Rect;
+use sdl2::rect::{Rect, Point};
 use sdl2::render::Texture;
 use sdl2::ttf::Font;
 use std::rc::Rc;
@@ -15,6 +16,7 @@ use std::rc::Rc;
 pub struct TextCharacter {
     pending: bool,
     text_character: char,
+    position: usize,
     line: usize,
     source: Rect,
     dest: Rect,
@@ -22,10 +24,11 @@ pub struct TextCharacter {
 }
 
 impl TextCharacter {
-    pub fn new(text_character: char, line: usize, color: Color) -> Self {
+    pub fn new(text_character: char, position: usize, line: usize, color: Color) -> Self {
         Self {
             pending: true,
             text_character,
+            position,
             line,
             source: Rect::new(0, 0, 0, 0),
             dest: Rect::new(0, 0, 0, 0),
@@ -68,20 +71,19 @@ impl TextCharacter {
             .load(&font_details)
             .unwrap_or_else(|_| panic!("Font not found {:?}", font_details));
 
-        let c = self.text_character.clone();
-        if let Ok((width, height)) = font.size_of_char(c) {
-            self.source = Rect::new(0, 0, width, height);
-            self.dest = Rect::new(0, 0, width, height);
+        if let Some(rect) = get_text_character_rect(self.text_character.clone(), renderer) {
+            self.source = rect.clone();
+            self.dest = rect.clone();
         }
         let mut details = TextDetails {
-            text: c.to_string(),
+            text: self.text_character.to_string(),
             color: self.color.clone(),
             font: font_details.clone(),
         };
         renderer
             .texture_manager()
             .load_text(&mut details, &font)
-            .unwrap_or_else(|_| panic!("Could not create texture for {:?}", c));
+            .unwrap_or_else(|_| panic!("Could not create texture for {:?}", self.text_character));
 
         self.pending = false;
         UpdateResult::RefreshPositions
@@ -96,6 +98,10 @@ impl TextCharacter {
     pub fn is_pending(&self) -> bool {
         self.pending
     }
+
+    pub fn position(&self) -> usize {
+        self.position
+    }
 }
 
 impl Render for TextCharacter {
@@ -140,7 +146,10 @@ impl Update for TextCharacter {
 
 impl ClickHandler for TextCharacter {
     fn on_left_click(&mut self, _point: &Point, _config: &Config) -> UpdateResult {
-        UpdateResult::MoveCaret(self.dest().clone())
+        UpdateResult::MoveCaret(
+            self.dest().clone(),
+            self.position()
+        )
     }
 
     fn is_left_click_target(&self, point: &Point) -> bool {