live-preview: Send telemetry to VSCode

Send telemetry data from the live-preview to vscode.

It will process that data according to telemetry settings in VScode

tools/lsp/common.rs

@@ -532,6 +532,8 @@ pub enum PreviewToLspMessage {
     SendWorkspaceEdit { label: Option<String>, edit: lsp_types::WorkspaceEdit },
     /// Pass a `ShowMessage` notification on to the editor
     SendShowMessage { message: lsp_types::ShowMessageParams },
+    /// Senf a telemetry event
+    TelemetryEvent(serde_json::Map<String, serde_json::Value>),
 }
 
 /// Information on the Element types available

tools/lsp/main.rs

@@ -581,6 +581,11 @@ async fn handle_preview_to_lsp_message(
             ctx.server_notifier
                 .send_notification::<lsp_types::notification::ShowMessage>(message)?;
         }
+        M::TelemetryEvent(object) => {
+            ctx.server_notifier.send_notification::<lsp_types::notification::TelemetryEvent>(
+                lsp_types::OneOf::Left(object),
+            )?
+        }
     }
     Ok(())
 }

tools/lsp/preview.rs

@@ -538,6 +538,8 @@ fn set_code_binding(
     property_name: slint::SharedString,
     property_value: slint::SharedString,
 ) {
+    send_telemetry(&mut [("type".to_string(), serde_json::to_value("property_changed").unwrap())]);
+
     set_binding(
         element_url,
         element_version,
@@ -685,6 +687,8 @@ fn can_drop_component(component_index: i32, x: f32, y: f32, on_drop_area: bool)
 
 // triggered from the UI, running in UI thread
 fn drop_component(component_index: i32, x: f32, y: f32) {
+    send_telemetry(&mut [("type".to_string(), serde_json::to_value("component_dropped").unwrap())]);
+
     let Some(document_cache) = document_cache() else {
         return;
     };
@@ -1886,6 +1890,17 @@ pub fn lsp_to_preview_message(message: crate::common::LspToPreviewMessage) {
     }
 }
 
+pub fn send_telemetry(data: &mut [(String, serde_json::Value)]) {
+    let object = {
+        let mut object = serde_json::Map::new();
+        for (name, value) in data.iter_mut() {
+            object.insert(std::mem::take(name), std::mem::take(value));
+        }
+        object
+    };
+    send_message_to_lsp(crate::common::PreviewToLspMessage::TelemetryEvent(object));
+}
+
 #[cfg(test)]
 pub mod test {
     use std::{collections::HashMap, path::PathBuf, rc::Rc};

tools/lsp/preview/native.rs

@@ -176,6 +176,10 @@ pub(super) fn open_ui_impl(preview_state: &mut PreviewState) -> Result<(), slint
         Some(ui) => ui,
         None => {
             let ui = super::ui::create_ui(default_style, experimental)?;
+            crate::preview::send_telemetry(&mut [(
+                "type".to_string(),
+                serde_json::to_value("preview_opened").unwrap(),
+            )]);
             preview_state.ui.insert(ui)
         }
     };

tools/lsp/wasm_main.rs

@@ -302,6 +302,14 @@ impl SlintServer {
                     .server_notifier
                     .send_notification::<lsp_types::notification::ShowMessage>(message);
             }
+            M::TelemetryEvent(object) => {
+                let _ = self
+                    .ctx
+                    .server_notifier
+                    .send_notification::<lsp_types::notification::TelemetryEvent>(
+                        lsp_types::OneOf::Left(object),
+                    );
+            }
         }
         Ok(())
     }