Step 1: Add simplified crop types in ui/widgets, update imports

src/application/commands/crop_document.rs

@@ -8,7 +8,7 @@ use cosmic::iced::{ContentFit, Size, Vector};
 use crate::application::DocumentManager;
 use crate::domain::document::core::content::DocumentKind;
 use crate::domain::document::core::document::DocResult;
-use crate::ui::components::crop::CropRegion;
+use crate::ui::widgets::CropRegion;
 
 /// Crop document command.
 ///
@@ -52,7 +52,8 @@ impl CropDocumentCommand {
         scale: f32,
         pan_offset: Vector,
     ) -> Result<Self, String> {
-        let canvas_rect = crop_region.as_tuple();
+        let (x, y, w, h) = crop_region.as_tuple();
+        let canvas_rect = (x as f32, y as f32, w as f32, h as f32);
 
         // Convert canvas coordinates to image pixel coordinates
         let image_rect = Self::canvas_rect_to_image_rect(

src/ui/message.rs

@@ -5,7 +5,7 @@
 
 use std::path::PathBuf;
 
-use crate::ui::components::crop::DragHandle;
+use crate::ui::widgets::DragHandle;
 
 #[derive(Debug, Clone)]
 pub enum AppMessage {

src/ui/mod.rs

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-3.0-or-later
 // src/ui/mod.rs
 //
-// UI layer: COSMIC application, views, and components.
+// UI layer: COSMIC application, views, and widgets.
 
 pub mod app;
 pub mod message;
@@ -9,6 +9,7 @@ pub mod model;
 pub mod update;
 pub mod components;
 pub mod views;
+pub mod widgets;
 
 // Internal module for syncing model from DocumentManager
 pub(crate) mod sync;

src/ui/model.rs

@@ -5,7 +5,7 @@
 
 use cosmic::iced::Size;
 
-use crate::ui::components::crop::CropSelection;
+use crate::ui::widgets::CropSelection;
 use crate::config::AppConfig;
 
 // =============================================================================

src/ui/update.rs

@@ -11,7 +11,7 @@ use super::model::{AppModel, ToolMode, ViewMode};
 use crate::application::commands::transform_document::{TransformDocumentCommand, TransformOperation};
 use crate::application::commands::crop_document::CropDocumentCommand;
 
-use crate::ui::components::crop::DragHandle;
+use crate::ui::widgets::DragHandle;
 
 // =============================================================================
 // Update Result
@@ -200,12 +200,12 @@ pub fn update(app: &mut NoctuaApp, msg: &AppMessage) -> UpdateResult {
         AppMessage::ApplyCrop => {
             if app.model.tool_mode == ToolMode::Crop {
                 // Get crop selection region
-                if let Some(region) = &app.model.crop_selection.region {
+                if let Some(crop_region) = app.model.crop_selection.to_crop_region() {
                     // Create crop command from canvas selection
                     let pan_offset = cosmic::iced::Vector::new(app.model.pan_x, app.model.pan_y);
 
                     match CropDocumentCommand::from_canvas_selection(
-                        region,
+                        &crop_region,
                         app.model.canvas_size,
                         app.model.image_size,
                         app.model.scale,

src/ui/views/canvas.rs

@@ -1,15 +1,13 @@
 // SPDX-License-Identifier: GPL-3.0-or-later
-// src/app/view/canvas.rs
+// src/ui/views/canvas.rs
 //
 // Render the center canvas area with the current document.
 
 use cosmic::iced::widget::image::FilterMethod;
 use cosmic::iced::{ContentFit, Length};
-use cosmic::iced_widget::stack;
 use cosmic::widget::{container, text};
 use cosmic::Element;
 
-use crate::ui::components::crop::crop_overlay;
 use super::image_viewer::Viewer;
 use crate::ui::model::{ToolMode, ViewMode};
 use crate::ui::{AppMessage, AppModel};
@@ -49,16 +47,12 @@ pub fn view<'a>(
             .scale_step(config.scale_step - 1.0)
             .disable_pan(model.tool_mode == ToolMode::Crop);
 
-        if model.tool_mode == ToolMode::Crop {
-            let overlay = crop_overlay(&model.crop_selection, config.crop_show_grid);
-
-            stack![img_viewer, overlay].into()
-        } else {
-            container(img_viewer)
-                .width(Length::Fill)
-                .height(Length::Fill)
-                .into()
-        }
+        // TODO: Add crop dialog when ToolMode::Crop
+        // For now, just show the viewer
+        container(img_viewer)
+            .width(Length::Fill)
+            .height(Length::Fill)
+            .into()
     } else {
         container(text(fl!("no-document")))
             .width(Length::Fill)

src/ui/widgets/crop_types.rs

@@ -0,0 +1,201 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/ui/widgets/crop_types.rs
+//
+// Simple crop types (based on Cupola, simplified from our complex implementation).
+
+/// Crop region in pixel coordinates.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct CropRegion {
+    pub x: u32,
+    pub y: u32,
+    pub width: u32,
+    pub height: u32,
+}
+
+/// Drag handle for crop selection (simple enum, no Direction struct).
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
+pub enum DragHandle {
+    #[default]
+    None,
+    TopLeft,
+    TopRight,
+    BottomLeft,
+    BottomRight,
+    Top,
+    Bottom,
+    Left,
+    Right,
+    Move,
+}
+
+/// Crop selection state (uses simple tuples instead of complex structs).
+#[derive(Debug, Clone, Default)]
+pub struct CropSelection {
+    /// Region as (x, y, width, height) in image coordinates
+    pub region: Option<(f32, f32, f32, f32)>,
+    pub is_dragging: bool,
+    pub drag_handle: DragHandle,
+    drag_start: Option<(f32, f32)>,
+    drag_start_region: Option<(f32, f32, f32, f32)>,
+}
+
+impl CropSelection {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    pub fn start_new_selection(&mut self, x: f32, y: f32) {
+        self.region = Some((x, y, 0.0, 0.0));
+        self.is_dragging = true;
+        self.drag_handle = DragHandle::None;
+        self.drag_start = Some((x, y));
+        self.drag_start_region = None;
+    }
+
+    pub fn start_handle_drag(&mut self, handle: DragHandle, x: f32, y: f32) {
+        self.is_dragging = true;
+        self.drag_handle = handle;
+        self.drag_start = Some((x, y));
+        self.drag_start_region = self.region;
+    }
+
+    pub fn update_drag(&mut self, x: f32, y: f32, img_width: f32, img_height: f32) {
+        if !self.is_dragging {
+            return;
+        }
+
+        match self.drag_handle {
+            DragHandle::None => {
+                // Creating new selection
+                if let Some((start_x, start_y)) = self.drag_start {
+                    let min_x = start_x.min(x).max(0.0);
+                    let min_y = start_y.min(y).max(0.0);
+                    let max_x = start_x.max(x).min(img_width);
+                    let max_y = start_y.max(y).min(img_height);
+
+                    self.region = Some((min_x, min_y, max_x - min_x, max_y - min_y));
+                }
+            }
+            DragHandle::Move => {
+                // Moving entire selection
+                if let (Some((start_x, start_y)), Some((rx, ry, rw, rh))) =
+                    (self.drag_start, self.drag_start_region)
+                {
+                    let dx = x - start_x;
+                    let dy = y - start_y;
+                    let new_x = (rx + dx).max(0.0).min(img_width - rw);
+                    let new_y = (ry + dy).max(0.0).min(img_height - rh);
+                    self.region = Some((new_x, new_y, rw, rh));
+                }
+            }
+            _ => {
+                // Resizing from edge/corner
+                if let Some((rx, ry, rw, rh)) = self.drag_start_region {
+                    let (new_x, new_y, new_w, new_h) =
+                        self.resize_region(rx, ry, rw, rh, x, y, img_width, img_height);
+                    self.region = Some((new_x, new_y, new_w, new_h));
+                }
+            }
+        }
+    }
+
+    fn resize_region(
+        &self,
+        rx: f32,
+        ry: f32,
+        rw: f32,
+        rh: f32,
+        x: f32,
+        y: f32,
+        img_width: f32,
+        img_height: f32,
+    ) -> (f32, f32, f32, f32) {
+        const MIN_SIZE: f32 = 10.0;
+
+        let right = rx + rw;
+        let bottom = ry + rh;
+        let x = x.max(0.0).min(img_width);
+        let y = y.max(0.0).min(img_height);
+
+        match self.drag_handle {
+            DragHandle::TopLeft => {
+                let new_x = x.min(right - MIN_SIZE);
+                let new_y = y.min(bottom - MIN_SIZE);
+                (new_x, new_y, right - new_x, bottom - new_y)
+            }
+            DragHandle::TopRight => {
+                let new_right = x.max(rx + MIN_SIZE);
+                let new_y = y.min(bottom - MIN_SIZE);
+                (rx, new_y, new_right - rx, bottom - new_y)
+            }
+            DragHandle::BottomLeft => {
+                let new_x = x.min(right - MIN_SIZE);
+                let new_bottom = y.max(ry + MIN_SIZE);
+                (new_x, ry, right - new_x, new_bottom - ry)
+            }
+            DragHandle::BottomRight => {
+                let new_right = x.max(rx + MIN_SIZE);
+                let new_bottom = y.max(ry + MIN_SIZE);
+                (rx, ry, new_right - rx, new_bottom - ry)
+            }
+            DragHandle::Top => {
+                let new_y = y.min(bottom - MIN_SIZE);
+                (rx, new_y, rw, bottom - new_y)
+            }
+            DragHandle::Bottom => {
+                let new_bottom = y.max(ry + MIN_SIZE);
+                (rx, ry, rw, new_bottom - ry)
+            }
+            DragHandle::Left => {
+                let new_x = x.min(right - MIN_SIZE);
+                (new_x, ry, right - new_x, rh)
+            }
+            DragHandle::Right => {
+                let new_right = x.max(rx + MIN_SIZE);
+                (rx, ry, new_right - rx, rh)
+            }
+            _ => (rx, ry, rw, rh),
+        }
+    }
+
+    pub fn end_drag(&mut self) {
+        self.is_dragging = false;
+        self.drag_start = None;
+        self.drag_start_region = None;
+    }
+
+    pub fn to_crop_region(&self) -> Option<CropRegion> {
+        self.region.and_then(|(x, y, w, h)| {
+            if w > 1.0 && h > 1.0 {
+                Some(CropRegion {
+                    x: x as u32,
+                    y: y as u32,
+                    width: w as u32,
+                    height: h as u32,
+                })
+            } else {
+                None
+            }
+        })
+    }
+
+    pub fn reset(&mut self) {
+        *self = Self::default();
+    }
+
+    pub fn has_selection(&self) -> bool {
+        self.region
+            .map(|(_, _, w, h)| w > 1.0 && h > 1.0)
+            .unwrap_or(false)
+    }
+}
+
+impl CropRegion {
+    pub fn new(x: u32, y: u32, width: u32, height: u32) -> Self {
+        Self { x, y, width, height }
+    }
+
+    pub fn as_tuple(&self) -> (u32, u32, u32, u32) {
+        (self.x, self.y, self.width, self.height)
+    }
+}

src/ui/widgets/mod.rs

@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/ui/widgets/mod.rs
+//
+// Custom widgets module.
+
+pub mod crop_types;
+// pub mod crop_widget;  // TODO: Implement next
+
+pub use crop_types::{CropRegion, CropSelection, DragHandle};