revert: 移除触控板手势

Author: zty012

crates/project_graph/src/stage.rs

@@ -104,25 +104,18 @@ impl Stage {
             );
         });
 
-        ui.input(|i| {
-            let zoom = i.zoom_delta();
-            if zoom != 1.0 {
-                if let Some(mouse_pos) = i.pointer.hover_pos() {
-                    let old_zoom = self.camera.zoom();
-                    self.camera.zoom_by(zoom);
-
-                    // 修正缩放中心
-                    let offset = mouse_pos - rect.center();
-                    let delta = offset * (self.camera.zoom() / old_zoom - 1.0);
-                    self.camera.pan_by(delta);
-                }
-            }
-
-            let scroll_delta = -i.smooth_scroll_delta;
-            if scroll_delta != egui::Vec2::ZERO && zoom == 1.0 {
-                self.camera.pan_by(scroll_delta);
+        let scroll_delta = ui.input(|i| i.smooth_scroll_delta);
+        if scroll_delta.y != 0.0 {
+            if let Some(mouse_pos) = ui.input(|i| i.pointer.hover_pos()) {
+                let zoom_factor = (1.0 + scroll_delta.y * 0.01).clamp(0.9, 1.1);
+                let old_zoom = self.camera.zoom();
+                self.camera.zoom_by(zoom_factor);
+
+                let offset = mouse_pos - rect.center();
+                let delta = offset * (self.camera.zoom() / old_zoom - 1.0);
+                self.camera.pan_by(delta);
             }
-        });
+        }
 
         // 中键拖拽平移
         if response.dragged_by(egui::PointerButton::Middle) {