feat: native window webview zoom rust-JS API

Author: abose

src-tauri/Cargo.lock

@@ -18,6 +18,7 @@ serde_json = "1.0"
 once_cell = "1.19.0"
 percent-encoding = "2.3"
 regex = "1.10.2"
+webkit2gtk = "0.18" # if tauri build fails, make sure to match this version to what we have in tauri
 serde = { version = "1.0", features = ["derive"] }
 tauri = { version = "1.5.4", features = [ "cli", "api-all", "updater", "devtools", "linux-protocol-headers"] }
 winapi = { version = "0.3", features = ["fileapi"] }

src-tauri/Cargo.toml

@@ -9,6 +9,8 @@ use std::fs::metadata;
 use std::path::PathBuf;
 
 use std::process::Command;
+#[cfg(target_os = "linux")]
+extern crate webkit2gtk;
 
 use regex::Regex;
 extern crate percent_encoding;
@@ -105,6 +107,30 @@ fn show_in_folder(path: String) {
     }
 }
 
+#[tauri::command]
+fn zoom_window(window: tauri::Window, scale_factor: f64) {
+    let _ = window.with_webview(move |webview| {
+        #[cfg(target_os = "linux")]
+        {
+          // see https://docs.rs/webkit2gtk/0.18.2/webkit2gtk/struct.WebView.html
+          // and https://docs.rs/webkit2gtk/0.18.2/webkit2gtk/trait.WebViewExt.html
+          use webkit2gtk::traits::WebViewExt;
+          webview.inner().set_zoom_level(scale_factor);
+        }
+
+        #[cfg(windows)]
+        unsafe {
+          // see https://docs.rs/webview2-com/0.19.1/webview2_com/Microsoft/Web/WebView2/Win32/struct.ICoreWebView2Controller.html
+          webview.controller().SetZoomFactor(scale_factor).unwrap();
+        }
+
+        #[cfg(target_os = "macos")]
+        unsafe {
+          let () = msg_send![webview.inner(), setPageZoom: scale_factor];
+        }
+      });
+}
+
 fn process_window_event(event: &GlobalWindowEvent) {
     if let tauri::WindowEvent::CloseRequested { .. } = event.event() {
         // this does nothing and is here if in future you need to persist something on window close.
@@ -170,7 +196,7 @@ fn main() {
         .on_window_event(|event| process_window_event(&event))
         .invoke_handler(tauri::generate_handler![
             toggle_devtools, console_log, console_error,
-            _get_windows_drives, _rename_path, show_in_folder])
+            _get_windows_drives, _rename_path, show_in_folder, zoom_window])
         .setup(|app| {
             init::init_app(app);
             Ok(())