From c97b91744ef37baa76b4a91deb1a9f48aeb3fd6a Mon Sep 17 00:00:00 2001
From: Akshay <nerdy@peppe.rs>
Date: Sat, 3 Apr 2021 14:35:31 +0530
Subject: implement brush size caching

---
 src/app.rs   | 33 +++++++++++++++++++++++++++++++++
 src/cache.rs |  3 +++
 src/main.rs  |  1 +
 3 files changed, 37 insertions(+)
 create mode 100644 src/cache.rs

(limited to 'src')

diff --git a/src/app.rs b/src/app.rs
index 119fc38..4a4e2cc 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -1,6 +1,7 @@
 use crate::{
     bitmap::{positive_angle_with_x, MapPoint, Pixmap},
     brush::{Brush, CircleBrush, LineBrush},
+    cache::Cache,
     command::CommandBox,
     consts::{colors::*, FONT_PATH, RC_PATH, STDLIB_PATH},
     dither,
@@ -15,6 +16,7 @@ use crate::{
 };
 
 use std::{
+    cell::RefCell,
     convert::From,
     fs::File,
     io::prelude::*,
@@ -45,6 +47,7 @@ pub struct AppState<'ctx> {
     pub brush: Brush,
     pub canvas: Canvas<Window>,
     pub command_box: CommandBox,
+    pub cache: RefCell<Option<Cache>>,
     pub context: &'ctx Sdl,
     pub current_operation: Vec<PaintRecord>,
     pub dither_level: u8,
@@ -90,6 +93,13 @@ impl<'ctx> AppState<'ctx> {
         self.pixmap.height
     }
 
+    pub fn cache(&self) {
+        let mut cache = self.cache.borrow_mut();
+        *cache = Some(Cache {
+            last_brush_size: self.brush.size().unwrap_or(0),
+        });
+    }
+
     fn bounds(&self) -> (Point, Point) {
         let x_min = self.start.x();
         let y_min = self.start.y();
@@ -593,6 +603,7 @@ impl<'ctx> AppState<'ctx> {
             canvas,
             command_box: CommandBox::new(),
             context,
+            cache: RefCell::new(None),
             current_operation: Vec::new(),
             dither_level: 16,
             file_name,
@@ -711,9 +722,30 @@ impl<'ctx> AppState<'ctx> {
                                         eprintln!("writing to file");
                                         buffer.write_all(&encoded[..]).unwrap();
                                     }
+                                    _ if keymod == Mod::LCTRLMOD || keymod == Mod::RCTRLMOD => {
+                                        self.brush = Brush::line(
+                                            self.cache
+                                                .borrow()
+                                                .as_ref()
+                                                .map(|c| c.last_brush_size)
+                                                .unwrap_or(0),
+                                            true,
+                                        );
+                                    }
                                     _ => (),
                                 }
                             }
+                            Event::KeyUp {
+                                keycode: Some(k), ..
+                            } if k == Keycode::LCtrl || k == Keycode::RCtrl => {
+                                self.brush = Brush::new(
+                                    self.cache
+                                        .borrow()
+                                        .as_ref()
+                                        .map(|c| c.last_brush_size)
+                                        .unwrap_or(0),
+                                );
+                            }
                             // start of operation
                             Event::MouseButtonDown {
                                 x, y, mouse_btn, ..
@@ -869,6 +901,7 @@ impl<'ctx> AppState<'ctx> {
                     }
                 }
             }
+            self.cache();
             self.redraw();
         }
     }
diff --git a/src/cache.rs b/src/cache.rs
new file mode 100644
index 0000000..249eca9
--- /dev/null
+++ b/src/cache.rs
@@ -0,0 +1,3 @@
+pub struct Cache {
+    pub last_brush_size: u8,
+}
diff --git a/src/main.rs b/src/main.rs
index 304f6fc..9370abf 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,7 @@
 mod app;
 mod bitmap;
 mod brush;
+mod cache;
 mod cli;
 mod command;
 mod consts;
-- 
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