Add image.rs viewer

src/viewer/image.rs

@@ -0,0 +1,62 @@
+//! 圖片檢視器
+
+use anyhow::Result;
+use std::path::Path;
+
+#[derive(Debug, Clone)]
+pub struct ImageViewer {
+    path: Option<String>,
+    zoom: f32,
+    pan_x: i32,
+    pan_y: i32,
+}
+
+impl ImageViewer {
+    pub fn new() -> Self {
+        Self {
+            path: None,
+            zoom: 1.0,
+            pan_x: 0,
+            pan_y: 0,
+        }
+    }
+
+    pub fn open(&mut self, path: &str) -> Result<()> {
+        if !Path::new(path).exists() {
+            anyhow::bail!("File not found: {}", path);
+        }
+        self.path = Some(path.to_string());
+        self.reset_view();
+        Ok(())
+    }
+
+    pub fn zoom_in(&mut self) {
+        self.zoom = (self.zoom * 1.25).min(10.0);
+    }
+
+    pub fn zoom_out(&mut self) {
+        self.zoom = (self.zoom / 1.25).max(0.1);
+    }
+
+    pub fn pan(&mut self, dx: i32, dy: i32) {
+        self.pan_x += dx;
+        self.pan_y += dy;
+    }
+
+    pub fn reset_view(&mut self) {
+        self.zoom = 1.0;
+        self.pan_x = 0;
+        self.pan_y = 0;
+    }
+
+    pub fn get_path(&self) -> Option<&str> {
+        self.path.as_deref()
+    }
+
+    pub fn get_transform(&self) -> String {
+        format!(
+            "scale({}) translate({}px, {}px)",
+            self.zoom, self.pan_x, self.pan_y
+        )
+    }
+}