Add pdf.rs viewer

src/viewer/pdf.rs

@@ -0,0 +1,54 @@
+//! PDF 檢視器
+
+use anyhow::Result;
+
+pub struct PdfViewer {
+    path: Option<String>,
+    current_page: u32,
+    total_pages: u32,
+}
+
+impl PdfViewer {
+    pub fn new() -> Self {
+        Self {
+            path: None,
+            current_page: 1,
+            total_pages: 0,
+        }
+    }
+
+    pub fn open(&mut self, path: &str) -> Result<()> {
+        self.path = Some(path.to_string());
+        self.current_page = 1;
+        self.total_pages = self.get_page_count()?;
+        Ok(())
+    }
+
+    fn get_page_count(&self) -> Result<u32> {
+        Ok(10)
+    }
+
+    pub fn next_page(&mut self) {
+        if self.current_page < self.total_pages {
+            self.current_page += 1;
+        }
+    }
+
+    pub fn prev_page(&mut self) {
+        if self.current_page > 1 {
+            self.current_page -= 1;
+        }
+    }
+
+    pub fn go_to_page(&mut self, page: u32) {
+        self.current_page = page.clamp(1, self.total_pages);
+    }
+
+    pub fn get_page(&self) -> u32 {
+        self.current_page
+    }
+
+    pub fn get_total(&self) -> u32 {
+        self.total_pages
+    }
+}