{"record":{"id":"16a4f8e849d7e02b","repo":"slint-ui/slint","slug":"failed-to-create-a-slint-file-in-error","errorCode":null,"errorMessage":"Failed to create a Slint file in {}: {error}","messagePattern":"Failed to create a Slint file in (.+?): (.+?)","errorType":"console","errorClass":null,"httpStatus":null,"severity":"warning","filePath":"tools/editor/preview/ui/file_tree.rs","lineNumber":44,"sourceCode":"    project: &Project<'_>,\n    project_weak: slint::Weak<Project<'static>>,\n) -> SharedFileTreeController {\n    project.set_file_tree(Default::default());\n    project.set_selected_project_file(Default::default());\n\n    let controller: SharedFileTreeController = Rc::new(RefCell::new(None));\n\n    let controller_for_create = controller.clone();\n    let project_weak_for_create = project_weak.clone();\n    project.on_create_new_slint_file(move || {\n        let Some(project) = project_weak_for_create.upgrade() else {\n            return Default::default();\n        };\n        let mut controller = controller_for_create.borrow_mut();\n        let Some(controller) = controller.as_mut() else {\n            return Default::default();\n        };\n        controller.create_new_slint_file(&project).err().map_or_else(\n            SharedString::default,\n            |error| {\n                tracing::warn!(\n                    \"Failed to create a Slint file in {}: {error}\",\n                    controller.root.display()\n                );\n                error.to_shared_string()\n            },\n        )\n    });\n\n    let controller_for_select = controller.clone();\n    let api_weak_for_select = api_weak.clone();\n    let project_weak_for_select = project_weak.clone();\n    api.on_file_tree_select(move |path| {\n        if let Some(api) = api_weak_for_select.upgrade()\n            && let Some(project) = project_weak_for_select.upgrade()\n            && let Some(controller) = controller_for_select.borrow_mut().as_mut()","sourceCodeStart":26,"sourceCodeEnd":62,"githubUrl":"https://github.com/slint-ui/slint/blob/3a7e700487dc74d404cad0726378053ab763d4e0/tools/editor/preview/ui/file_tree.rs#L26-L62","documentation":"The editor preview's file-tree 'create new Slint file' action failed. The plugin resolved a create-controller for the project root and asked it to create a new .slint file; the underlying create operation returned an Err, which is logged as a warning with the project root path. The UI does not surface a hard error - it degrades to a logged warning.","triggerScenarios":"Calling the create-new-file handler when controller.create_new_slint_file(&project) fails, e.g. the target directory is not writable, the file already exists, or the project path is invalid.","commonSituations":"User tries to create a new .slint file from the IDE preview's file tree in a read-only directory, a path with invalid characters, or when the project root moved/deleted after the controller was built.","solutions":["Check the logged error detail and verify the directory controller.root.display() exists and is writable","Ensure the intended file name is valid and does not already exist","Rebuild/refresh the project controller so it points at the actual project root","Create the file manually in the IDE and reload the preview"],"exampleFix":"// before\nreturn Default::default();\n// after\n// surface the failure instead of swallowing it\nmatch controller.create_new_slint_file(&project) {\n    Ok(path) => /* update tree with path */,\n    Err(error) => show_error_notification(&format!(\"Failed to create file: {error}\")),\n}","handlingStrategy":"validation","validationCode":"if (!controller.root.as_path().is_dir()) { eprintln!(\"project root missing: {}\", controller.root.display()); return; }\nif std::fs::metadata(&controller.root).map(|m| m.permissions().readonly()).unwrap_or(true) { eprintln!(\"project root read-only\"); return; }","typeGuard":"fn is_writable_dir(p: &std::path::Path) -> bool {\n    std::fs::metadata(p).map(|m| m.is_dir() && !m.permissions().readonly()).unwrap_or(false)\n}","tryCatchPattern":"match controller.create_new_slint_file(&project) {\n    Ok(path) => refresh_tree(&path),\n    Err(e) => notify_user(&format!(\"Create failed: {e}\")),\n}","preventionTips":["Validate the project root exists and is writable before enabling the create action","Check for name collisions before creating a file","Refresh the project controller when the workspace root changes"],"tags":["rust","filesystem","file-creation"],"backgroundTag":"file-write-failed","analyzedSha":"3a7e700487dc74d404cad0726378053ab763d4e0","analyzedAt":"2026-09-16T01:37:20.251Z","contentChangedAt":"2026-09-16T01:37:20.251Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}