WebView2: Enable/disable platform default zooming shortcuts, closes #569

 (#574)

* add with_zoom(bool) to WebViewBuilder,
but only on Windows (WebView2)

* enable/disable "pinch to zoom" as well

* add changelog

Co-authored-by: Amr Bashir <amr.bashir2015@gmail.com>

* Request: Change variable name to include "hotkey"

Co-authored-by: Amr Bashir <amr.bashir2015@gmail.com>

* Request: Change comments/documentation

Co-authored-by: Amr Bashir <amr.bashir2015@gmail.com>

* Request: Different coding style

Co-authored-by: Amr Bashir <amr.bashir2015@gmail.com>

* Request: Enable builder method for other platforms

Co-authored-by: Amr Bashir <amr.bashir2015@gmail.com>

.changes/allow-zooming.md

@@ -0,0 +1,5 @@
+---
+"wry": minor
+---
+
+Add option to enable/disable zoom shortcuts for WebView2, disabled by default.

src/webview/mod.rs

@@ -67,6 +67,12 @@ pub struct WebViewAttributes {
   pub transparent: bool,
   /// Whether load the provided URL to [`WebView`].
   pub url: Option<Url>,
+  /// Whether page zooming by hotkeys is enabled
+  ///
+  /// ## Platform-specific
+  ///
+  /// **macOS / Linux / Android / iOS**: Unsupported
+  pub zoom_hotkeys_enabled: bool,
   /// Whether load the provided html string to [`WebView`].
   /// This will be ignored if the `url` is provided.
   ///
@@ -169,6 +175,7 @@ impl Default for WebViewAttributes {
       navigation_handler: None,
       clipboard: false,
       devtools: false,
+      zoom_hotkeys_enabled: false,
     }
   }
 }
@@ -333,6 +340,16 @@ impl<'a> WebViewBuilder<'a> {
     self
   }
 
+  /// Whether page zooming by hotkeys or gestures is enabled
+  ///
+  /// ## Platform-specific
+  ///
+  /// **macOS / Linux / Android / iOS**: Unsupported
+  pub fn with_hotkeys_zoom(mut self, zoom: bool) -> Self {
+    self.webview.zoom_hotkeys_enabled = zoom;
+    self
+  }
+
   /// Set a navigation handler to decide if incoming url is allowed to navigate.
   ///
   /// The closure takes a `String` parameter as url and return `bool` to determine the url. True is

src/webview/webview2/mod.rs

@@ -213,7 +213,7 @@ impl InnerWebView {
         .SetAreDefaultContextMenusEnabled(true)
         .map_err(webview2_com::Error::WindowsError)?;
       settings
-        .SetIsZoomControlEnabled(false)
+        .SetIsZoomControlEnabled(attributes.zoom_hotkeys_enabled)
         .map_err(webview2_com::Error::WindowsError)?;
       settings
         .SetAreDevToolsEnabled(false)
@@ -222,6 +222,9 @@ impl InnerWebView {
         let _ = settings.SetAreDevToolsEnabled(true);
       }
 
+      let settings5 = settings.cast::<ICoreWebView2Settings5>()?;
+      let _ = settings5.SetIsPinchZoomEnabled(attributes.zoom_hotkeys_enabled);
+
       let mut rect = RECT::default();
       GetClientRect(hwnd, &mut rect);
       controller