Add screen model

build.rs

@@ -1,4 +1,6 @@
 
 fn main() {
-    println!("cargo:rustc-link-search=native=C:\\msys64\\mingw64\\lib");
+    if cfg!(target = "windows") {
+        println!("cargo:rustc-link-search=native=C:\\msys64\\mingw64\\lib");
+    }
 }

src/main.rs

@@ -1,6 +1,7 @@
 extern crate gtk;
 extern crate cairo;
 
+mod ui_model;
 mod ui;
 
 use ui::Ui;

src/ui.rs

@@ -3,6 +3,8 @@ use gtk;
 use gtk::prelude::*;
 use gtk::{Window, WindowType, DrawingArea, Grid, Button, ButtonBox, Orientation};
 
+use ui_model::UiModel;
+
 pub struct Ui;
 
 impl Ui {

src/ui_model.rs

@@ -0,0 +1,40 @@
+pub struct Cell {
+    ch: char,
+}
+
+impl Cell {
+    pub fn new(ch: char) -> Cell {
+        Cell { ch: ch }
+    }
+}
+
+pub struct UiModel {
+    columns: u64,
+    rows: u64,
+    cur_row: u64,
+    cur_col: u64,
+    model: Vec<Cell>,
+}
+
+impl UiModel {
+    pub fn new(columns: u64, rows: u64) -> UiModel {
+        let cells = (columns * rows) as usize;
+        let mut model = Vec::with_capacity(cells);
+        for i in 0..cells {
+            model[i] = Cell::new(' ');
+        }
+
+        UiModel { 
+            columns: columns,
+            rows: rows,
+            cur_row: 0,
+            cur_col: 0,
+            model: model,
+        }
+    }
+
+    pub fn set_cursor(&mut self, col: u64, row: u64) {
+        self.cur_col = col;
+        self.cur_row = row;
+    }
+}