chore: initial commit

src/app/view/canvas.rs

@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: MPL-2.0
+// src/app/view/canvas.rs
+//
+// Center canvas for displaying the current document.
+
+use cosmic::iced::{Alignment, Length};
+use cosmic::widget::{container, image, text, Column, Row};
+use cosmic::Element;
+
+use crate::fl;
+use crate::app::model::ViewMode;
+use crate::app::{AppMessage, AppModel};
+
+/// Render the center canvas area with the current document.
+pub fn view(model: &AppModel) -> Element<'_, AppMessage> {
+    if let Some(doc) = &model.document {
+        let handle = doc.handle();
+
+        let img_widget = match &model.view_mode {
+            ViewMode::Fit => {
+                // Fit mode: image scales to fill container while preserving aspect ratio.
+                image::Image::new(handle)
+                    .width(Length::Fill)
+                    .height(Length::Fill)
+            }
+            ViewMode::ActualSize => {
+                // 1:1 pixel size.
+                let (native_w, native_h) = doc.dimensions();
+                image::Image::new(handle)
+                    .width(Length::Fixed(native_w as f32))
+                    .height(Length::Fixed(native_h as f32))
+            }
+            ViewMode::Custom(_) => {
+                // Custom zoom factor applied to native size.
+                let (native_w, native_h) = doc.dimensions();
+                let scaled_w = (native_w as f32 * model.zoom).round();
+                let scaled_h = (native_h as f32 * model.zoom).round();
+                image::Image::new(handle)
+                    .width(Length::Fixed(scaled_w))
+                    .height(Length::Fixed(scaled_h))
+            }
+        };
+
+        // Center the image both horizontally and vertically.
+        Column::new()
+            .width(Length::Fill)
+            .height(Length::Fill)
+            .align_x(Alignment::Center)
+            .push(
+                Row::new()
+                    .push(img_widget)
+                    .width(Length::Fill)
+                    .height(Length::Fill)
+                    .align_y(Alignment::Center),
+            )
+            .into()
+    } else {
+        container(text(fl!("no_document_loaded")))
+            .center_x(Length::Fill)
+            .center_y(Length::Fill)
+            .width(Length::Fill)
+            .height(Length::Fill)
+            .into()
+    }
+}