From 149bc3627b886c306a877ac802c62089714326eb Mon Sep 17 00:00:00 2001
From: Akshay <nerdy@peppe.rs>
Date: Fri, 19 Mar 2021 09:40:31 +0530
Subject: add grid centering keybind

---
 src/app.rs | 52 +++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 35 insertions(+), 17 deletions(-)

diff --git a/src/app.rs b/src/app.rs
index 3571436..8543c85 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -225,6 +225,30 @@ impl<'ctx> AppState<'ctx> {
         self.zoom += 1;
     }
 
+    fn zoom_out(&mut self, p: (i32, i32)) {
+        if self.zoom > 1 {
+            // attempt to center around cursor
+            if let Some(p) = self.idx_at_coord(p) {
+                let (x1, y1) = (p.0 * (self.zoom as u32), p.1 * (self.zoom as u32));
+                let (x2, y2) = (p.0 * (self.zoom as u32 - 1), p.1 * (self.zoom as u32 - 1));
+                let diffx = x2 as i32 - x1 as i32;
+                let diffy = y2 as i32 - y1 as i32;
+                self.start = self.start - Point::from((diffx, diffy));
+            }
+            self.zoom -= 1;
+        }
+    }
+
+    fn center_grid(&mut self) {
+        let (winsize_x, winsize_y) = self.canvas.window().size();
+        let grid_width = self.width() * self.zoom as u32;
+        let grid_height = self.height() * self.zoom as u32;
+        self.start = Point::new(
+            (winsize_x as i32 - grid_width as i32) / 2,
+            (winsize_y as i32 - grid_height as i32) / 2,
+        );
+    }
+
     fn increase_brush_size(&mut self) {
         self.brush_size += 1;
     }
@@ -263,20 +287,6 @@ impl<'ctx> AppState<'ctx> {
         self.mode = Mode::Draw;
     }
 
-    fn zoom_out(&mut self, p: (i32, i32)) {
-        if self.zoom > 1 {
-            // attempt to center around cursor
-            if let Some(p) = self.idx_at_coord(p) {
-                let (x1, y1) = (p.0 * (self.zoom as u32), p.1 * (self.zoom as u32));
-                let (x2, y2) = (p.0 * (self.zoom as u32 - 1), p.1 * (self.zoom as u32 - 1));
-                let diffx = x2 as i32 - x1 as i32;
-                let diffy = y2 as i32 - y1 as i32;
-                self.start = self.start - Point::from((diffx, diffy));
-            }
-            self.zoom -= 1;
-        }
-    }
-
     fn draw_grid(&mut self) {
         let cs = self.zoom as u32;
         let (width, height) = (self.width(), self.height());
@@ -523,7 +533,9 @@ impl<'ctx> AppState<'ctx> {
                     Mode::Draw => {
                         match event {
                             Event::KeyDown {
-                                keycode: Some(k), ..
+                                keycode: Some(k),
+                                keymod,
+                                ..
                             } => {
                                 match k {
                                     // pan
@@ -532,6 +544,9 @@ impl<'ctx> AppState<'ctx> {
                                     Keycode::S => self.pan((0, -10)),
                                     Keycode::D => self.pan((-10, 0)),
                                     // zoom
+                                    Keycode::C if keymod == Mod::LSHIFTMOD => {
+                                        self.center_grid();
+                                    }
                                     Keycode::C => {
                                         let cursor = (mouse.x(), mouse.y());
                                         self.zoom_in(cursor);
@@ -647,11 +662,14 @@ impl<'ctx> AppState<'ctx> {
                             let video = self.context.video().unwrap();
                             let clipboard = video.clipboard();
                             if is_copy_event(keycode, keymod) {
-                                clipboard.set_clipboard_text(&self.command_box.text);
+                                clipboard
+                                    .set_clipboard_text(&self.command_box.text)
+                                    .unwrap();
                             } else if is_paste_event(keycode, keymod)
                                 && clipboard.has_clipboard_text()
                             {
-                                self.command_box.text = clipboard.clipboard_text().unwrap();
+                                self.command_box
+                                    .push_str(&clipboard.clipboard_text().unwrap());
                             }
                         }
                         if let Event::KeyDown {
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