Add Viewport up/down scroll

src/main.rs

@@ -31,10 +31,9 @@ use druid::{
 
 use im::Vector;
 
-use stiletto::tool::{CanvasToolCtx, CanvasToolParams};
-use stiletto::widget::{
-    build_simple_tool_widget, CanvasState, CanvasToolIconState, CanvasWidget,
-};
+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() {

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::{Affine, 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 {
@@ -32,166 +27,3 @@ pub enum CanvasToolType {
     Pen,
     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,
-        mut ctx: &mut EventCtx,
-        event: &Event,
-        mut vcanvas: &mut VersionedCanvas,
-        transform: Affine,
-        env: &Env,
-    ) {
-        match self.initial_params.tool_type() {
-            CanvasToolType::Pen => self.handle_pen_event(ctx, event, vcanvas, transform, env),
-            CanvasToolType::Eraser => self.handle_erase_event(ctx, event, vcanvas, transform, env),
-        }
-    }
-
-    pub fn handle_erase_event(
-        &mut self,
-        ctx: &mut EventCtx,
-        event: &Event,
-        vcanvas: &mut VersionedCanvas,
-        transform: Affine,
-        _env: &Env,
-    ) {
-        match (&mut self.state, event) {
-            (CanvasToolState::Idle, Event::MouseDown(_)) => {
-                self.state = CanvasToolState::Erasing;
-                ctx.set_handled();
-            }
-            (CanvasToolState::Erasing, Event::MouseMove(mouse_event)) => {
-                let eraser_rect =
-                    druid::Rect::from_center_size(transform * 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;
-                        }
-                    }
-                    true
-                });
-                if new_elements.len() != old_elements.len() {
-                    vcanvas.update(|canvas: &mut Canvas| {
-                        *canvas = Canvas::new_with_elements(new_elements);
-                    });
-                }
-                ctx.set_handled();
-            }
-            (CanvasToolState::Erasing, Event::MouseUp(_)) => {
-                self.state = CanvasToolState::Idle;
-                ctx.set_handled();
-            }
-            _ => {}
-        }
-    }
-
-    pub fn handle_pen_event(
-        &mut self,
-        ctx: &mut EventCtx,
-        event: &Event,
-        vcanvas: &mut VersionedCanvas,
-        transform: Affine,
-        _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(),
-                        },
-                    };
-                }
-                ctx.set_handled();
-            }
-            (
-                CanvasToolState::DrawingFreehand {
-                    ref mut current_path,
-                    ..
-                },
-                Event::MouseMove(mouse_event),
-            ) => {
-                if let CanvasElement::Freehand { ref mut path, .. } = current_path {
-                    path.kurbo_path
-                        .line_to((mouse_event.pos.x, mouse_event.pos.y));
-                }
-                ctx.set_handled();
-            }
-            (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 {
-                        if let CanvasElement::Freehand {
-                            mut path,
-                            mut thickness,
-                            stroke_color,
-                        } = current_path
-                        {
-                            path.kurbo_path.apply_affine(transform);
-                            canvas.add_element(CanvasElement::Freehand {
-                                path,
-                                thickness,
-                                stroke_color,
-                            });
-                        }
-                    }
-                });
-                ctx.set_handled();
-            }
-            _ => {}
-        }
-    }
-
-    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

@@ -16,9 +16,9 @@
 
 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::scroll_component::ScrollComponent;
@@ -86,7 +86,7 @@ impl CanvasState {
         &mut self.tool_ctx
     }
 
-    pub fn handle_event(&mut self, mut ctx: &mut EventCtx, event: &Event, transform: Affine, env: &Env) {
+    pub fn handle_event(&mut self, ctx: &mut EventCtx, event: &Event, transform: Affine, env: &Env) {
         self.tool_ctx
             .handle_event(ctx, event, &mut self.versioned_canvas, transform, env);
     }

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 +1,190 @@
+//  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::{Affine, 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: &mut EventCtx,
+        event: &Event,
+        vcanvas: &mut VersionedCanvas,
+        transform: Affine,
+        env: &Env,
+    ) {
+        match self.initial_params.tool_type() {
+            CanvasToolType::Pen => self.handle_pen_event(ctx, event, vcanvas, transform, env),
+            CanvasToolType::Eraser => self.handle_erase_event(ctx, event, vcanvas, transform, env),
+        }
+    }
+
+    pub fn handle_erase_event(
+        &mut self,
+        ctx: &mut EventCtx,
+        event: &Event,
+        vcanvas: &mut VersionedCanvas,
+        transform: Affine,
+        _env: &Env,
+    ) {
+        match (&mut self.state, event) {
+            (CanvasToolState::Idle, Event::MouseDown(mouse_event)) if pressed(mouse_event) => {
+                self.state = CanvasToolState::Erasing;
+                ctx.set_handled();
+            }
+            (CanvasToolState::Erasing, Event::MouseMove(mouse_event)) if pressed(mouse_event) => {
+                let eraser_rect =
+                    druid::Rect::from_center_size(transform * 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);
+                    });
+                }
+                ctx.set_handled();
+            }
+            (CanvasToolState::Erasing, Event::MouseUp(mouse_event)) if pressed(mouse_event) => {
+                self.state = CanvasToolState::Idle;
+                ctx.set_handled();
+            }
+            _ => {}
+        }
+    }
+
+    pub fn handle_pen_event(
+        &mut self,
+        ctx: &mut EventCtx,
+        event: &Event,
+        vcanvas: &mut VersionedCanvas,
+        transform: Affine,
+        _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(),
+                        },
+                    };
+                }
+                ctx.set_handled();
+            }
+            (
+                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));
+                }
+                ctx.set_handled();
+            }
+            (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,
+                            thickness,
+                            stroke_color,
+                        } = current_path
+                        {
+                            path.kurbo_path.apply_affine(transform);
+                            canvas.add_element(CanvasElement::Freehand {
+                                path,
+                                thickness,
+                                stroke_color,
+                            });
+                        }
+                    }
+                });
+                ctx.set_handled();
+            }
+            _ => {}
+        }
+    }
+
+    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),
+            _ => {}
+        }
+    }
+}