Use serde_bare and update format version

Cargo.lock

@@ -162,6 +162,38 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "clap"
+version = "3.0.0-beta.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4bd1061998a501ee7d4b6d449020df3266ca3124b941ec56cf2005c3779ca142"
+dependencies = [
+ "atty",
+ "bitflags",
+ "clap_derive",
+ "indexmap",
+ "lazy_static",
+ "os_str_bytes",
+ "strsim",
+ "termcolor",
+ "textwrap",
+ "unicode-width",
+ "vec_map",
+]
+
+[[package]]
+name = "clap_derive"
+version = "3.0.0-beta.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "370f715b81112975b1b69db93e0b56ea4cd4e5002ac43b2da8474106a54096a1"
+dependencies = [
+ "heck",
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "cmake"
 version = "0.1.45"
@@ -338,7 +370,7 @@ checksum = "212d0f5754cb6769937f4501cc0e67f4f4483c8d2c3e1e922ee9edbe4ab4c7c0"
 [[package]]
 name = "druid"
 version = "0.7.0"
-source = "git+https://github.com/doppioandante/druid?branch=v0.7.0_stiletto#f0a6fd3f6bece1b1d10e261ce57673d7f6f1969a"
+source = "git+https://github.com/doppioandante/druid?branch=v0.7.0_stiletto#2cbb14456fb1813e673d2151626630d2c4db68bf"
 dependencies = [
  "console_log",
  "druid-derive",
@@ -361,7 +393,7 @@ dependencies = [
 [[package]]
 name = "druid-derive"
 version = "0.4.0"
-source = "git+https://github.com/doppioandante/druid?branch=v0.7.0_stiletto#f0a6fd3f6bece1b1d10e261ce57673d7f6f1969a"
+source = "git+https://github.com/doppioandante/druid?branch=v0.7.0_stiletto#2cbb14456fb1813e673d2151626630d2c4db68bf"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -371,7 +403,7 @@ dependencies = [
 [[package]]
 name = "druid-shell"
 version = "0.7.0"
-source = "git+https://github.com/doppioandante/druid?branch=v0.7.0_stiletto#f0a6fd3f6bece1b1d10e261ce57673d7f6f1969a"
+source = "git+https://github.com/doppioandante/druid?branch=v0.7.0_stiletto#2cbb14456fb1813e673d2151626630d2c4db68bf"
 dependencies = [
  "anyhow",
  "bitflags",
@@ -852,6 +884,12 @@ dependencies = [
  "pkg-config",
 ]
 
+[[package]]
+name = "hashbrown"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d7afe4a420e3fe79967a00898cc1f4db7c8a49a9333a29f8a4bd76a253d5cd04"
+
 [[package]]
 name = "heck"
 version = "0.3.2"
@@ -884,6 +922,16 @@ dependencies = [
  "version_check",
 ]
 
+[[package]]
+name = "indexmap"
+version = "1.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "824845a0bf897a9042383849b02c1bc219c2383772efcd5c6f9766fa4b81aef3"
+dependencies = [
+ "autocfg",
+ "hashbrown",
+]
+
 [[package]]
 name = "instant"
 version = "0.1.9"
@@ -1034,6 +1082,12 @@ version = "1.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "13bd41f508810a131401606d54ac32a467c97172d74ba7662562ebba5ad07fa0"
 
+[[package]]
+name = "os_str_bytes"
+version = "2.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "afb2e1c3ee07430c2cf76151675e583e0f19985fa6efae47d6848a3e2c824f85"
+
 [[package]]
 name = "pango"
 version = "0.9.1"
@@ -1343,6 +1397,15 @@ dependencies = [
  "serde_derive",
 ]
 
+[[package]]
+name = "serde_bare"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "01db2255aa98fb93ad74272d8b2e6fd4851860e733e944b9439cf148127164b2"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "serde_derive"
 version = "1.0.117"
@@ -1487,6 +1550,7 @@ checksum = "213701ba3370744dcd1a12960caa4843b3d68b4d1c0a5d575e0d65b2ee9d16c0"
 name = "stiletto"
 version = "0.1.0"
 dependencies = [
+ "clap",
  "druid",
  "gdk",
  "gio",
@@ -1494,9 +1558,16 @@ dependencies = [
  "im",
  "log",
  "serde",
+ "serde_bare",
  "serde_json",
 ]
 
+[[package]]
+name = "strsim"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
+
 [[package]]
 name = "strum"
 version = "0.18.0"
@@ -1551,6 +1622,24 @@ dependencies = [
  "version-compare",
 ]
 
+[[package]]
+name = "termcolor"
+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2dfed899f0eb03f32ee8c6a0aabdb8a7949659e3466561fc0adf54e26d88c5f4"
+dependencies = [
+ "winapi-util",
+]
+
+[[package]]
+name = "textwrap"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "203008d98caf094106cfaba70acfed15e18ed3ddb7d94e49baec153a2b462789"
+dependencies = [
+ "unicode-width",
+]
+
 [[package]]
 name = "thiserror"
 version = "1.0.24"
@@ -1759,6 +1848,12 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b1d386ff53b415b7fe27b50bb44679e2cc4660272694b7b6f3326d8480823a94"
 
+[[package]]
+name = "unicode-width"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9337591893a19b88d8d87f2cec1e73fad5cdfd10e5a6f349f498ad6ea2ffb1e3"
+
 [[package]]
 name = "unicode-xid"
 version = "0.2.1"
@@ -1807,6 +1902,12 @@ dependencies = [
  "getrandom",
 ]
 
+[[package]]
+name = "vec_map"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
+
 [[package]]
 name = "version-compare"
 version = "0.0.10"
@@ -1905,6 +2006,15 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 
+[[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
 [[package]]
 name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"

Cargo.toml

@@ -3,27 +3,30 @@ name = "stiletto"
 version = "0.1.0"
 authors = ["Enrico Lumetti <enrico.lumetti@gmail.com>"]
 edition = "2018"
+default-run = "stiletto"
 
 [dependencies]
 log = "0.4"
 druid = { version = "0.7.0", features = ["im", "svg"] }
 im = { version = "*" }
 serde = { version = "1.0", features = ["derive"] }
-#serde_bare = "0.3.0"
+serde_bare = "0.3.0"
 serde_json = "1.0"
+clap = "3.0.0-beta.2"
+
+[target.'cfg(target_os="linux")'.dependencies.gtk]
+version = "0.9.2"
+features = ["v3_22"]
+
+[target.'cfg(target_os="linux")'.dependencies.gio]
+version = "0.9.1"
+features = ["v2_56"]
+
+[target.'cfg(target_os="linux")'.dependencies.gdk]
+version = "0.13.2"
+features = ["v3_22"]
 
 [patch.crates-io]
 druid = { git = "https://github.com/doppioandante/druid", branch = "v0.7.0_stiletto", features = ["im", "svg"] }
 #druid = { path = "../druid/druid/", features = ["im", "svg"] }
 
-[dependencies.gtk]
-version = "0.9.2"
-features = ["v3_22"]
-
-[dependencies.gio]
-version = "0.9.1"
-features = ["v2_56"]
-
-[dependencies.gdk]
-version = "0.13.2"
-features = ["v3_22"]

src/bin/stlt_migrate.rs

@@ -0,0 +1,48 @@
+//  Stiletto
+//  Copyright (C) 2020 Stiletto Authors
+//
+//  This program is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU Affero General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU Affero General Public License for more details.
+//
+//  You should have received a copy of the GNU Affero General Public License
+//  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+use clap::{Arg, App};
+use stiletto::migration::open_stiletto_document;
+
+use std::fs::File;
+use std::path::PathBuf;
+
+fn main() {
+    let matches = App::new("Stiletto Migration CLI")
+        .version("0.1.0")
+        .author("Stiletto Authors")
+        .about("Migrate a stlt file to the latest version")
+        .arg(Arg::new("INPUT")
+            .about("Sets the input file to use")
+            .required(true)
+            .index(1))
+        .arg(Arg::new("OUTPUT")
+            .about("Sets the output file to use")
+            .required(true)
+            .index(2))
+        .get_matches();
+
+   let input_path = matches.value_of("INPUT").unwrap();
+   let output_path = matches.value_of("OUTPUT").unwrap();
+
+   let out_file = File::create(&output_path).expect("Cannot create output fle");
+
+   let result = open_stiletto_document(&PathBuf::from(&input_path));
+   if let Ok(document) = result {
+       let snapshot = document.migrate_to_latest();
+       snapshot.to_writer(out_file);
+   }
+}

src/canvas.rs

@@ -16,7 +16,7 @@
 
 use std::vec::Vec;
 
-use im::Vector;
+use im::{vector, Vector};
 
 use serde::de::{Deserializer, SeqAccess, Visitor};
 use serde::ser::Serializer;
@@ -128,20 +128,43 @@ impl CanvasElement {
             }
         }
     }
-
-    pub fn get_path_mut(&mut self) -> Option<&mut Path> {
-        match self {
-            CanvasElement::Freehand { path, .. } => Some(path),
-        }
-    }
 }
 
 #[derive(Clone, druid::Data)]
 pub struct Canvas {
-    pub elements: Vector<CanvasElement>,
+    elements: Vector<CanvasElement>,
+    content_size: druid::Size,
 }
 
 impl Canvas {
+    pub fn new() -> Self {
+        Canvas {
+            elements: vector![],
+            content_size: druid::Size::new(0.0, 0.0),
+        }
+    }
+
+    pub fn new_with_elements(elements: Vector<CanvasElement>) -> Self {
+        let mut cv = Canvas::new();
+        for e in elements {
+            cv.add_element(e);
+        }
+        cv
+    }
+
+    pub fn add_element(&mut self, element: CanvasElement) {
+        self.content_size = self
+            .content_size
+            .to_rect()
+            .union(element.bounding_box())
+            .size();
+        self.elements.push_back(element);
+    }
+
+    pub fn elements(&self) -> &Vector<CanvasElement> {
+        &self.elements
+    }
+
     /// Find all CanvasElement that intersect with rect
     pub fn find_intersections(&self, rect: druid::Rect) -> Vec<usize> {
         let mut found_elements = Vec::<usize>::new();
@@ -157,6 +180,10 @@ impl Canvas {
 
         found_elements
     }
+
+    pub fn content_size(&self) -> druid::Size {
+        self.content_size
+    }
 }
 
 impl Serialize for Path {
@@ -170,7 +197,7 @@ impl Serialize for Path {
             PathEl::MoveTo(pt) => Some(Into::<(f64, f64)>::into(pt)),
             PathEl::LineTo(pt) => Some(Into::<(f64, f64)>::into(pt)),
             _ => None,
-        }))
+        }).collect::<Vec<(f64, f64)>>())
     }
 }
 

src/lib.rs

@@ -21,16 +21,28 @@ pub mod canvas;
 pub mod history;
 pub mod tool;
 pub mod widget;
+pub mod migration;
 
 pub mod commands {
     use druid::Selector;
 
     pub const UPDATE_TOOL: Selector = Selector::new("stiletto_update_tool");
+    pub const PUSH_ERASER: Selector<()> = Selector::new("push_eraser_context");
+    pub const POP_ERASER: Selector<()> = Selector::new("pop_eraser_context");
 }
 
+pub const STILETTO_FORMAT_MAJOR: u16 = 0;
+pub const STILETTO_FORMAT_MINOR: u16 = 2;
+
 #[derive(Serialize, Deserialize, Debug)]
 pub struct DocumentSnapshot {
     pub format_version_major: u16,
     pub format_version_minor: u16,
     pub canvas_elements: Vec<canvas::CanvasElement>,
 }
+
+impl DocumentSnapshot {
+    pub fn to_writer<W: std::io::Write>(&self, writer: W) -> Result<(), serde_bare::Error> {
+        serde_bare::to_writer(writer, &self)
+    }
+}

src/main.rs

@@ -14,31 +14,39 @@
 //  You should have received a copy of the GNU Affero General Public License
 //  along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
+use std::path::PathBuf;
+
 use log::{info, warn};
 
 use druid::commands;
 use druid::im::vector;
 use druid::widget::prelude::*;
-use druid::widget::{Align, Button, CrossAxisAlignment, Flex, List, SizedBox, WidgetExt};
+use druid::widget::{
+    Align, Button, Controller, CrossAxisAlignment, Flex, List, SizedBox, WidgetExt,
+};
 use druid::{
     AppDelegate, AppLauncher, Color, Command, Data, DelegateCtx, Env, FileDialogOptions, FileSpec,
-    Handled, Lens, LocalizedString, Target, WindowDesc,
+    Handled, Lens, Target, WindowDesc,
 };
 
 use im::Vector;
 
-use stiletto::canvas::Canvas;
-use stiletto::history::VersionedCanvas;
-use stiletto::tool::{CanvasToolCtx, CanvasToolParams};
+use stiletto::tool::CanvasToolParams;
+use stiletto::widget::tool_ctx::{CanvasToolCtx};
 use stiletto::widget::{build_simple_tool_widget, CanvasState, CanvasToolIconState, CanvasWidget};
 use stiletto::DocumentSnapshot;
 
 pub fn main() {
     let window = WindowDesc::new(build_ui)
         .window_size((1024.0, 1400.0))
-        .title(
-            LocalizedString::new("custom-widget-demo-window-title").with_placeholder("Stiletto"),
-        );
+        .title(|data: &StilettoState, _env: &Env| {
+            let doc_name = if let Some(path) = &data.current_file_path {
+                String::from(path.to_string_lossy())
+            } else {
+                String::from("New Document")
+            };
+            format!("Stiletto - {}", doc_name)
+        });
 
     let default_pen_params = CanvasToolParams::Pen {
         thickness: 2.0,
@@ -49,12 +57,7 @@ pub fn main() {
         color: Color::rgb(255.0, 0.0, 0.0),
     };
     let canvas_data = StilettoState {
-        canvas: CanvasState {
-            versioned_canvas: VersionedCanvas::new(Canvas {
-                elements: vector![],
-            }),
-            tool_ctx: CanvasToolCtx::new(default_pen_params.clone()),
-        },
+        canvas: CanvasState::new(CanvasToolCtx::new(default_pen_params.clone())),
         tool_icons: vector![
             CanvasToolIconState {
                 tool_params: default_pen_params,
@@ -70,6 +73,8 @@ pub fn main() {
             },
         ],
         current_tool: 0,
+        eraser_tool_id: 2,
+        current_file_path: None,
     };
     AppLauncher::with_window(window)
         .use_simple_logger()
@@ -83,6 +88,22 @@ struct StilettoState {
     canvas: CanvasState,
     tool_icons: Vector<CanvasToolIconState>,
     current_tool: usize,
+    eraser_tool_id: usize,
+    #[data(same_fn = "PartialEq::eq")]
+    current_file_path: Option<PathBuf>,
+}
+
+impl StilettoState {
+    pub fn set_tool(&mut self, new_tool: usize) {
+        let old_tool = self.current_tool;
+        info!("Changing active tool to: tool #{}", new_tool);
+        self.tool_icons.get_mut(old_tool).unwrap().selected = false;
+        self.tool_icons.get_mut(new_tool).unwrap().selected = true;
+        self.current_tool = new_tool;
+        self.canvas.set_tool_ctx(CanvasToolCtx::new(
+            self.tool_icons.get(new_tool).unwrap().tool_params.clone(),
+        ));
+    }
 }
 
 fn build_ui() -> impl Widget<StilettoState> {
@@ -99,23 +120,37 @@ fn build_ui() -> impl Widget<StilettoState> {
     let save_dialog_options = FileDialogOptions::new()
         .allowed_types(vec![stlt])
         .default_type(stlt);
+    let save_dialog_options_clone = save_dialog_options.clone();
     let open_dialog_options = save_dialog_options.clone();
 
     let save_buttons = Flex::row()
         .cross_axis_alignment(CrossAxisAlignment::Center)
+        .with_child(
+            Button::new("Save").on_click(move |ctx, data: &mut StilettoState, _| {
+                if data.current_file_path.is_some() {
+                    ctx.submit_command(Command::new(commands::SAVE_FILE, (), Target::Auto));
+                } else {
+                    ctx.submit_command(Command::new(
+                        druid::commands::SHOW_SAVE_PANEL,
+                        save_dialog_options_clone.clone(),
+                        Target::Auto,
+                    ))
+                }
+            }),
+        )
+        .with_child(Button::new("Save As").on_click(move |ctx, _, _| {
+            ctx.submit_command(Command::new(
+                druid::commands::SHOW_SAVE_PANEL,
+                save_dialog_options.clone(),
+                Target::Auto,
+            ))
+        }))
         .with_child(Button::new("Open").on_click(move |ctx, _, _| {
             ctx.submit_command(Command::new(
                 druid::commands::SHOW_OPEN_PANEL,
                 open_dialog_options.clone(),
                 Target::Auto,
             ))
-        }))
-        .with_child(Button::new("Save").on_click(move |ctx, _, _| {
-            ctx.submit_command(Command::new(
-                druid::commands::SHOW_SAVE_PANEL,
-                save_dialog_options.clone(),
-                Target::Auto,
-            ))
         }));
 
     let tool_buttons = Flex::row()
@@ -126,7 +161,7 @@ fn build_ui() -> impl Widget<StilettoState> {
                     .padding((8.0, 0.0))
                     .on_click(|ctx, tool_state, _| {
                         tool_state.selected = true;
-                        ctx.submit_command(stiletto::commands::UPDATE_TOOL);
+                        ctx.submit_notification(stiletto::commands::UPDATE_TOOL);
                     })
             })
             .horizontal()
@@ -148,7 +183,57 @@ fn build_ui() -> impl Widget<StilettoState> {
         .cross_axis_alignment(CrossAxisAlignment::Center)
         .must_fill_main_axis(true)
         .with_child(SizedBox::new(Align::left(toolbar)).height(50.0))
-        .with_flex_child((CanvasWidget {}).lens(StilettoState::canvas), 1.0)
+        .with_flex_child((CanvasWidget).lens(StilettoState::canvas), 1.0)
+        .controller(ToolSwitcher::new())
+}
+
+struct ToolSwitcher {
+    saved_tool: usize,
+}
+
+impl ToolSwitcher {
+    pub fn new() -> Self {
+        ToolSwitcher { saved_tool: 0 }
+    }
+}
+
+impl<W: Widget<StilettoState>> Controller<StilettoState, W> for ToolSwitcher {
+    fn event(
+        &mut self,
+        child: &mut W,
+        ctx: &mut EventCtx,
+        event: &Event,
+        data: &mut StilettoState,
+        env: &Env,
+    ) {
+        match event {
+            Event::Notification(cmd) => {
+                let new_tool = if cmd.get(stiletto::commands::PUSH_ERASER).is_some() {
+                    ctx.set_handled();
+                    self.saved_tool = data.current_tool;
+                    Some(data.eraser_tool_id)
+                } else if cmd.get(stiletto::commands::POP_ERASER).is_some() {
+                    ctx.set_handled();
+                    Some(self.saved_tool)
+                } else if cmd.get(stiletto::commands::UPDATE_TOOL).is_some() {
+                    ctx.set_handled();
+                    let old_tool = data.current_tool;
+                    data.tool_icons
+                        .iter()
+                        .enumerate()
+                        .position(|(pos, x)| pos != old_tool && x.selected)
+                } else {
+                    None
+                };
+
+                if let Some(new_tool) = new_tool {
+                    data.set_tool(new_tool);
+                }
+            }
+            _ => {}
+        }
+        child.event(ctx, event, data, env);
+    }
 }
 
 struct Delegate;
@@ -164,15 +249,23 @@ impl AppDelegate<StilettoState> for Delegate {
     ) -> Handled {
         use std::fs::File;
 
-        if let Some(file_info) = cmd.get(commands::SAVE_FILE_AS) {
-            let res_file = File::create(file_info.path());
+        if cmd.get(commands::SAVE_FILE_AS).is_some() || cmd.get(commands::SAVE_FILE).is_some() {
+            let mut path_buf = cmd
+                .get(commands::SAVE_FILE_AS)
+                .map(|file_info| file_info.path().to_path_buf())
+                .or_else(|| data.current_file_path.as_ref().cloned())
+                .unwrap();
+            path_buf.set_extension("stlt");
+
+            let res_file = File::create(&path_buf);
             if let Ok(f) = res_file {
                 let write_res =
-                    serde_json::to_writer_pretty(f, &data.canvas.get_document_snapshot());
+                    data.canvas.get_document_snapshot().to_writer(f);
                 if write_res.is_err() {
                     warn!("Error while saving: {:?}", write_res.err());
                 } else {
-                    info!("Written to file: {}", file_info.path().display());
+                    info!("Written to file: {}", &path_buf.display());
+                    data.current_file_path = Some(path_buf);
                 }
             } else {
                 warn!("Cannot create file: {:?}", res_file.err());
@@ -181,33 +274,22 @@ impl AppDelegate<StilettoState> for Delegate {
         }
         if let Some(file_info) = cmd.get(commands::OPEN_FILE) {
             if let Ok(f) = File::open(file_info.path()) {
-                let res_snapshot: Result<DocumentSnapshot, serde_json::Error> =
-                    serde_json::from_reader(f);
+                let res_snapshot: Result<DocumentSnapshot, serde_bare::Error> =
+                    serde_bare::from_reader(f);
                 if let Ok(document_snapshot) = res_snapshot {
                     data.canvas.set_from_snapshot(document_snapshot);
+                    data.current_file_path = Some(file_info.path().to_path_buf());
                     info!("Loaded file {}", file_info.path().display());
                 } else {
-                    warn!("Error while loading {}: {:?}", file_info.path().display(), res_snapshot.err());
+                    warn!(
+                        "Error while loading {}: {:?}",
+                        file_info.path().display(),
+                        res_snapshot.err()
+                    );
                 }
             }
             return Handled::Yes;
         }
-        if cmd.get(stiletto::commands::UPDATE_TOOL).is_some() {
-            let old_tool = data.current_tool;
-            if let Some(new_tool) = data
-                .tool_icons
-                .iter()
-                .enumerate()
-                .position(|(pos, x)| pos != old_tool && x.selected)
-            {
-                info!("Changing active tool to: tool #{}", new_tool);
-                data.tool_icons.get_mut(old_tool).unwrap().selected = false;
-                data.current_tool = new_tool;
-                data.canvas.set_tool_ctx(CanvasToolCtx::new(
-                    data.tool_icons.get(new_tool).unwrap().tool_params.clone(),
-                ));
-            }
-        }
         Handled::No
     }
 }

src/migration.rs

@@ -0,0 +1,142 @@
+//  Stiletto
+//  Copyright (C) 2020 Stiletto Authors
+//
+//  This program is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU Affero General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU Affero General Public License for more details.
+//
+//  You should have received a copy of the GNU Affero General Public License
+//  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+use crate::{DocumentSnapshot, STILETTO_FORMAT_MAJOR, STILETTO_FORMAT_MINOR};
+
+use std::error::Error;
+use std::fmt;
+use std::fs::File;
+use std::io;
+use std::path::PathBuf;
+
+#[derive(Debug)]
+pub enum MigrationError {
+    SerdeJsonError(serde_json::Error),
+    SerdeBareError(serde_bare::Error),
+    IoError(io::Error),
+
+    UnexpectedVersion(u16, u16, u16, u16),
+}
+
+#[derive(Debug)]
+pub enum StilettoDocument {
+    DocumentSnapshot0_1(DocumentSnapshot),
+    DocumentSnapshot0_2(DocumentSnapshot),
+}
+
+impl StilettoDocument {
+    pub fn version(&self) -> (u16, u16) {
+        match &self {
+            StilettoDocument::DocumentSnapshot0_1(_) => (0, 1),
+            StilettoDocument::DocumentSnapshot0_2(_) => (0, 2),
+        }
+    }
+
+    pub fn migrate_to_next(self) -> StilettoDocument {
+        match self {
+            StilettoDocument::DocumentSnapshot0_1(snapshot) =>  StilettoDocument::DocumentSnapshot0_2(snapshot) ,
+            StilettoDocument::DocumentSnapshot0_2(_) => self,
+        }
+    }
+
+    pub fn migrate_to_latest(mut self) -> DocumentSnapshot {
+        while self.version() != (STILETTO_FORMAT_MAJOR, STILETTO_FORMAT_MINOR) {
+            self = self.migrate_to_next()
+        }
+
+        assert!(matches!(self, StilettoDocument::DocumentSnapshot0_2(_)));
+        match self {
+            StilettoDocument::DocumentSnapshot0_2(snapshot) => snapshot,
+            _ => panic!("Wrong Document Snapshot Version")
+        }
+    }
+}
+
+
+impl fmt::Display for MigrationError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match &self {
+            MigrationError::SerdeJsonError(e) => e.fmt(f),
+            MigrationError::SerdeBareError(e) => e.fmt(f),
+            MigrationError::IoError(e) => e.fmt(f),
+            MigrationError::UnexpectedVersion(major, minor, e_major, e_minor) => {
+                write!(
+                    f, "Unexpected version ({}, {}): was expecting ({}, {})",
+                    major, minor, e_major, e_minor
+                )
+            },
+        }
+    }
+}
+
+impl Error for MigrationError {
+    fn source(&self) -> Option<&(dyn Error + 'static)> {
+        match self {
+            MigrationError::SerdeJsonError(e) => e.source(),
+            MigrationError::SerdeBareError(e) => e.source(),
+            MigrationError::IoError(e) => e.source(),
+            MigrationError::UnexpectedVersion(..) => None,
+        }
+    }
+}
+
+impl From<io::Error> for MigrationError {
+    fn from(error: io::Error) -> Self {
+        MigrationError::IoError(error)
+    }
+}
+
+impl From<serde_json::Error> for MigrationError {
+    fn from(error: serde_json::Error) -> Self {
+        MigrationError::SerdeJsonError(error)
+    }
+}
+
+impl From<serde_bare::Error> for MigrationError {
+    fn from(error: serde_bare::Error) -> Self {
+        MigrationError::SerdeBareError(error)
+    }
+}
+
+fn open_0_1(path: &PathBuf) -> Result<StilettoDocument, MigrationError> {
+    let f = File::open(path)?;
+    let document_snapshot: DocumentSnapshot = serde_json::from_reader(f)?;
+    if document_snapshot.format_version_major != 0 ||
+        document_snapshot.format_version_minor != 1 {
+        Err(MigrationError::UnexpectedVersion(
+            document_snapshot.format_version_major,
+            document_snapshot.format_version_minor,
+            0, 1
+        ))
+    } else {
+        Ok(StilettoDocument::DocumentSnapshot0_1(document_snapshot))
+    }
+}
+
+fn open_0_2(path: &PathBuf) -> Result<StilettoDocument, MigrationError> {
+    let f = File::open(path)?;
+    let document_snapshot: DocumentSnapshot = serde_bare::from_reader(f)?;
+    Ok(StilettoDocument::DocumentSnapshot0_2(document_snapshot))
+}
+
+pub fn open_stiletto_document(path: &PathBuf) -> Result<StilettoDocument, MigrationError> {
+    if let Ok(res) = open_0_1(path) {
+        return Ok(res);
+    }
+
+    open_0_2(path)
+}
+

src/tool.rs

@@ -14,12 +14,7 @@
 //  You should have received a copy of the GNU Affero General Public License
 //  along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
-use druid::kurbo::BezPath;
-use druid::{Color, Data, Env, Event, EventCtx, PaintCtx};
-
-use crate::canvas;
-use crate::canvas::{Canvas, CanvasElement};
-use crate::history::VersionedCanvas;
+use druid::{Color, Data};
 
 #[derive(Clone, Data)]
 pub enum CanvasToolParams {
@@ -33,137 +28,3 @@ pub enum CanvasToolType {
     Eraser,
 }
 
-#[derive(Clone, Data)]
-pub enum CanvasToolState {
-    Idle,
-    DrawingFreehand {
-        pen_params: CanvasToolParams,
-        current_path: CanvasElement,
-    },
-    Erasing,
-}
-
-#[derive(Clone, Data)]
-pub struct CanvasToolCtx {
-    initial_params: CanvasToolParams,
-    state: CanvasToolState,
-}
-
-impl CanvasToolParams {
-    pub fn tool_type(&self) -> CanvasToolType {
-        match self {
-            CanvasToolParams::Pen { .. } => CanvasToolType::Pen,
-            CanvasToolParams::Eraser => CanvasToolType::Eraser,
-        }
-    }
-}
-
-impl CanvasToolCtx {
-    pub fn new(params: CanvasToolParams) -> Self {
-        CanvasToolCtx {
-            initial_params: params,
-            state: CanvasToolState::Idle,
-        }
-    }
-
-    pub fn handle_event(
-        &mut self,
-        ctx: &EventCtx,
-        event: &Event,
-        mut vcanvas: &mut VersionedCanvas,
-        env: &Env,
-    ) {
-        match self.initial_params.tool_type() {
-            CanvasToolType::Pen => self.handle_pen_event(&ctx, &event, &mut vcanvas, &env),
-            CanvasToolType::Eraser => self.handle_erase_event(&ctx, &event, &mut vcanvas, &env),
-        }
-    }
-
-    pub fn handle_erase_event(
-        &mut self,
-        _ctx: &EventCtx,
-        event: &Event,
-        vcanvas: &mut VersionedCanvas,
-        _env: &Env,
-    ) {
-        match (&mut self.state, event) {
-            (CanvasToolState::Idle, Event::MouseDown(_)) => {
-                self.state = CanvasToolState::Erasing;
-            }
-            (CanvasToolState::Erasing, Event::MouseMove(mouse_event)) => {
-                let eraser_rect = druid::Rect::from_center_size(mouse_event.pos, (5.0, 5.0));
-                let elements = vcanvas.get().find_intersections(eraser_rect);
-
-                if !elements.is_empty() {
-                    vcanvas.update(|canvas: &mut Canvas| {
-                        for i in elements {
-                            canvas.elements.remove(i);
-                        }
-                    });
-                }
-            }
-            (CanvasToolState::Erasing, Event::MouseUp(_)) => {
-                self.state = CanvasToolState::Idle;
-            }
-            _ => {}
-        }
-    }
-
-    pub fn handle_pen_event(
-        &mut self,
-        _ctx: &EventCtx,
-        event: &Event,
-        vcanvas: &mut VersionedCanvas,
-        _env: &Env,
-    ) {
-        match (&mut self.state, event) {
-            (CanvasToolState::Idle, Event::MouseDown(mouse_event)) => {
-                let mut kurbo_path = BezPath::new();
-                kurbo_path.move_to((mouse_event.pos.x, mouse_event.pos.y));
-                if let CanvasToolParams::Pen { thickness, color } = &self.initial_params {
-                    self.state = CanvasToolState::DrawingFreehand {
-                        pen_params: self.initial_params.clone(),
-                        current_path: CanvasElement::Freehand {
-                            path: canvas::Path { kurbo_path },
-                            thickness: *thickness,
-                            stroke_color: color.clone(),
-                        },
-                    };
-                }
-            }
-            (
-                CanvasToolState::DrawingFreehand {
-                    ref mut current_path,
-                    ..
-                },
-                Event::MouseMove(mouse_event),
-            ) => {
-                current_path
-                    .get_path_mut()
-                    .unwrap()
-                    .kurbo_path
-                    .line_to((mouse_event.pos.x, mouse_event.pos.y));
-            }
-            (CanvasToolState::DrawingFreehand { .. }, Event::MouseUp(_)) => {
-                vcanvas.update(move |canvas: &mut Canvas| {
-                    let current_state = std::mem::replace(&mut self.state, CanvasToolState::Idle);
-                    if let CanvasToolState::DrawingFreehand { current_path, .. } = current_state {
-                        canvas.elements.push_back(current_path);
-                    }
-                });
-            }
-            _ => {}
-        }
-    }
-
-    pub fn needs_repaint(&self) -> bool {
-        true
-    }
-
-    pub fn paint(&self, ctx: &mut PaintCtx, _env: &Env) {
-        match &self.state {
-            CanvasToolState::DrawingFreehand { current_path, .. } => current_path.draw(ctx),
-            _ => {}
-        }
-    }
-}

src/widget/canvas.rs

@@ -16,21 +16,29 @@
 
 use im::Vector;
 
+use super::tool_ctx::{CanvasToolCtx};
 use crate::canvas::Canvas;
 use crate::history::VersionedCanvas;
-use crate::tool::CanvasToolCtx;
 use crate::DocumentSnapshot;
 
 use druid::widget::prelude::*;
-use druid::{Color, Data, Env, Event};
+use druid::{Color, Data, Env, Event, PointerType};
 
 #[derive(Clone, Data)]
 pub struct CanvasState {
-    pub versioned_canvas: VersionedCanvas,
-    pub tool_ctx: CanvasToolCtx,
+    versioned_canvas: VersionedCanvas,
+    tool_ctx: CanvasToolCtx,
+    temporary_erasing: bool,
 }
 
 impl CanvasState {
+    pub fn new(tool_ctx: CanvasToolCtx) -> Self {
+        CanvasState {
+            versioned_canvas: VersionedCanvas::new(Canvas::new()),
+            tool_ctx: tool_ctx,
+            temporary_erasing: true,
+        }
+    }
     pub fn perform_undo(&mut self) {
         //if !self.is_drawing() {
         self.versioned_canvas.undo();
@@ -50,7 +58,7 @@ impl CanvasState {
             canvas_elements: self
                 .versioned_canvas
                 .get()
-                .elements
+                .elements()
                 .iter()
                 .cloned()
                 .collect(),
@@ -58,22 +66,62 @@ impl CanvasState {
     }
 
     pub fn set_from_snapshot(&mut self, snapshot: DocumentSnapshot) {
-        self.versioned_canvas = VersionedCanvas::new(Canvas {
-            elements: Vector::from(snapshot.canvas_elements),
-        });
+        self.versioned_canvas = VersionedCanvas::new(Canvas::new_with_elements(Vector::from(
+            snapshot.canvas_elements,
+        )));
     }
 
     pub fn set_tool_ctx(&mut self, ctx: CanvasToolCtx) {
         self.tool_ctx = ctx;
     }
+
+    pub fn get_tool_ctx(&self) -> &CanvasToolCtx {
+        &self.tool_ctx
+    }
+
+    pub fn get_tool_ctx_mut(&mut self) -> &mut CanvasToolCtx {
+        &mut self.tool_ctx
+    }
+
+    pub fn handle_event(&mut self, mut ctx: &mut EventCtx, event: &Event, env: &Env) {
+        self.tool_ctx
+            .handle_event(ctx, event, &mut self.versioned_canvas, env);
+    }
 }
 
 pub struct CanvasWidget;
 
 impl Widget<CanvasState> for CanvasWidget {
     fn event(&mut self, ctx: &mut EventCtx, event: &Event, data: &mut CanvasState, env: &Env) {
-        data.tool_ctx
-            .handle_event(ctx, event, &mut data.versioned_canvas, env);
+        ctx.request_focus();
+        let mut toggle_eraser_event = false;
+        let mut enable_temporary_erasing = false;
+        match event {
+            Event::MouseDown(mouse_event) => {
+                toggle_eraser_event = true;
+                enable_temporary_erasing = mouse_event.pointer_type == PointerType::Eraser;
+            }
+            Event::MouseMove(mouse_event) => {
+                toggle_eraser_event = true;
+                enable_temporary_erasing = mouse_event.pointer_type == PointerType::Eraser;
+            }
+            Event::MouseUp(mouse_event) => {
+                toggle_eraser_event = true;
+                enable_temporary_erasing = mouse_event.pointer_type == PointerType::Eraser;
+            }
+            _ => {}
+        }
+        // TODO: the first eraser toggle is not handled
+        if toggle_eraser_event && data.temporary_erasing != enable_temporary_erasing {
+            if enable_temporary_erasing {
+                ctx.submit_notification(crate::commands::PUSH_ERASER);
+            } else {
+                ctx.submit_notification(crate::commands::POP_ERASER);
+            }
+            data.temporary_erasing = enable_temporary_erasing;
+        } else {
+            data.handle_event(ctx, event, env);
+        }
     }
 
     fn lifecycle(
@@ -128,11 +176,9 @@ impl Widget<CanvasState> for CanvasWidget {
         // (ctx.size() returns the size of the layout rect we're painting in)
         let size = ctx.size();
         let rect = size.to_rect();
-        // Note: ctx also has a `clear` method, but that clears the whole context,
-        // and we only want to clear this widget's area.
-        ctx.fill(rect, &Color::WHITE);
 
-        for element in data.versioned_canvas.get().elements.iter() {
+        ctx.fill(rect, &Color::WHITE);
+        for element in data.versioned_canvas.get().elements().iter() {
             element.draw(ctx);
         }
         if data.tool_ctx.needs_repaint() {

src/widget/mod.rs

@@ -1,5 +1,6 @@
 pub mod canvas;
 pub mod tool_icon;
+pub mod tool_ctx;
 
 pub use canvas::*;
 pub use tool_icon::*;

src/widget/tool_ctx.rs

@@ -0,0 +1,179 @@
+//  Stiletto
+//  Copyright (C) 2020 Stiletto Authors
+//
+//  This program is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU Affero General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU Affero General Public License for more details.
+//
+//  You should have received a copy of the GNU Affero General Public License
+//  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+use crate::tool::{CanvasToolParams, CanvasToolType};
+use crate::canvas::{Canvas, CanvasElement};
+use crate::history::VersionedCanvas;
+
+use druid::kurbo::BezPath;
+use druid::{Data, Env, Event, EventCtx, MouseButton, MouseEvent, PaintCtx};
+
+#[derive(Clone, Data)]
+pub enum CanvasToolState {
+    Idle,
+    DrawingFreehand {
+        pen_params: CanvasToolParams,
+        current_path: CanvasElement,
+    },
+    Erasing,
+}
+
+#[derive(Clone, Data)]
+pub struct CanvasToolCtx {
+    initial_params: CanvasToolParams,
+    state: CanvasToolState,
+}
+
+impl CanvasToolParams {
+    pub fn tool_type(&self) -> CanvasToolType {
+        match self {
+            CanvasToolParams::Pen { .. } => CanvasToolType::Pen,
+            CanvasToolParams::Eraser => CanvasToolType::Eraser,
+        }
+    }
+}
+
+fn pressed(mouse_event: &MouseEvent) -> bool {
+    mouse_event.buttons.contains(MouseButton::Left)
+        || mouse_event.button == MouseButton::Left
+}
+
+impl CanvasToolCtx {
+    pub fn new(params: CanvasToolParams) -> Self {
+        CanvasToolCtx {
+            initial_params: params,
+            state: CanvasToolState::Idle,
+        }
+    }
+
+    pub fn handle_event(
+        &mut self,
+        ctx: &EventCtx,
+        event: &Event,
+        mut vcanvas: &mut VersionedCanvas,
+        env: &Env,
+    ) {
+        match self.initial_params.tool_type() {
+            CanvasToolType::Pen => self.handle_pen_event(&ctx, &event, &mut vcanvas, &env),
+            CanvasToolType::Eraser => self.handle_erase_event(&ctx, &event, &mut vcanvas, &env),
+        }
+    }
+
+    pub fn handle_erase_event(
+        &mut self,
+        _ctx: &EventCtx,
+        event: &Event,
+        vcanvas: &mut VersionedCanvas,
+        _env: &Env,
+    ) {
+        match (&mut self.state, event) {
+            (CanvasToolState::Idle, Event::MouseDown(mouse_event)) if pressed(mouse_event) => {
+                self.state = CanvasToolState::Erasing;
+            }
+            (CanvasToolState::Erasing, Event::MouseMove(mouse_event)) if pressed(mouse_event) => {
+                let eraser_rect = druid::Rect::from_center_size(mouse_event.pos, (5.0, 5.0));
+                let old_elements = vcanvas.get().elements();
+                let mut new_elements = old_elements.clone();
+                new_elements.retain(|elem| {
+                    // Check if the element intersects the eraser rect
+                    if elem.bounding_box().intersect(eraser_rect).area() > 0.0 {
+                        if elem.intersects_rect(eraser_rect) {
+                            return false;
+                        }
+                    }
+                    return true;
+                });
+                if new_elements.len() != old_elements.len() {
+                    vcanvas.update(|canvas: &mut Canvas| {
+                        *canvas = Canvas::new_with_elements(new_elements);
+                    });
+                }
+            }
+            (CanvasToolState::Erasing, Event::MouseUp(mouse_event)) if pressed(mouse_event) => {
+                self.state = CanvasToolState::Idle;
+            }
+            _ => {}
+        }
+    }
+
+    pub fn handle_pen_event(
+        &mut self,
+        _ctx: &EventCtx,
+        event: &Event,
+        vcanvas: &mut VersionedCanvas,
+        _env: &Env,
+    ) {
+        match (&mut self.state, event) {
+            (CanvasToolState::Idle, Event::MouseDown(mouse_event)) if pressed(mouse_event) => {
+                let mut kurbo_path = BezPath::new();
+                kurbo_path.move_to((mouse_event.pos.x, mouse_event.pos.y));
+                if let CanvasToolParams::Pen { thickness, color } = &self.initial_params {
+                    self.state = CanvasToolState::DrawingFreehand {
+                        pen_params: self.initial_params.clone(),
+                        current_path: CanvasElement::Freehand {
+                            path: crate::canvas::Path { kurbo_path },
+                            thickness: *thickness,
+                            stroke_color: color.clone(),
+                        },
+                    };
+                }
+            }
+            (
+                CanvasToolState::DrawingFreehand {
+                    ref mut current_path,
+                    ..
+                },
+                Event::MouseMove(mouse_event),
+            ) => if pressed(mouse_event) {
+                if let CanvasElement::Freehand { ref mut path, .. } = current_path {
+                    path.kurbo_path
+                        .line_to((mouse_event.pos.x, mouse_event.pos.y));
+                }
+            }
+            (CanvasToolState::DrawingFreehand { .. }, Event::MouseUp(mouse_event)) if pressed(mouse_event) => {
+                vcanvas.update(move |canvas: &mut Canvas| {
+                    let current_state = std::mem::replace(&mut self.state, CanvasToolState::Idle);
+                    if let CanvasToolState::DrawingFreehand { current_path, .. } = current_state {
+                        if let CanvasElement::Freehand {
+                            mut path,
+                            mut thickness,
+                            stroke_color,
+                        } = current_path
+                        {
+                            canvas.add_element(CanvasElement::Freehand {
+                                path,
+                                thickness,
+                                stroke_color,
+                            });
+                        }
+                    }
+                });
+            }
+            _ => {}
+        }
+    }
+
+    pub fn needs_repaint(&self) -> bool {
+        true
+    }
+
+    pub fn paint(&self, ctx: &mut PaintCtx, _env: &Env) {
+        match &self.state {
+            CanvasToolState::DrawingFreehand { current_path, .. } => current_path.draw(ctx),
+            _ => {}
+        }
+    }
+}