Enum AppEvent 

pub enum AppEvent {
    Key(KeyEvent),
    Open(Vec<PathBuf>, OpenOptions),
    OpenLazyFrame(Box<LazyFrame>, OpenOptions),
    DoLoad(Vec<PathBuf>, OpenOptions),
    DoLoadScanPaths(Vec<PathBuf>, OpenOptions),
    DoDownloadHttp(String, OpenOptions),
    DoDownloadS3ToTemp(String, OpenOptions),
    DoDownloadGcsToTemp(String, OpenOptions),
    DoLoadFromHttpTemp(PathBuf, OpenOptions),
    DoLoadSchema(Box<LazyFrame>, Option<PathBuf>, OpenOptions),
    DoLoadSchemaBlocking(Box<LazyFrame>, Option<PathBuf>, OpenOptions),
    DoLoadBuffer,
    DoDecompress(Vec<PathBuf>, OpenOptions),
    DoExport(PathBuf, ExportFormat, ExportOptions),
    DoExportCollect(PathBuf, ExportFormat, ExportOptions),
    DoExportWrite(PathBuf, ExportFormat, ExportOptions),
    DoLoadParquetMetadata,
    Exit,
    Crash(String),
    Search(String),
    SqlSearch(String),
    FuzzySearch(String),
    Filter(Vec<FilterStatement>),
    Sort(Vec<String>, bool),
    ColumnOrder(Vec<String>, usize),
    Pivot(PivotSpec),
    Melt(MeltSpec),
    Export(PathBuf, ExportFormat, ExportOptions),
    ChartExport(PathBuf, ChartExportFormat, String),
    DoChartExport(PathBuf, ChartExportFormat, String),
    Collect,
    Update,
    Reset,
    Resize(u16, u16),
    DoScrollDown,
    DoScrollUp,
    DoScrollNext,
    DoScrollPrev,
    DoScrollEnd,
    DoScrollHalfDown,
    DoScrollHalfUp,
    GoToLine(usize),
    AnalysisChunk,
    AnalysisDistributionCompute,
    AnalysisCorrelationCompute,
}

Variants

Key(KeyEvent)

Open(Vec<PathBuf>, OpenOptions)

OpenLazyFrame(Box<LazyFrame>, OpenOptions)

Open with an existing LazyFrame (e.g. from Python binding); no file load.

DoLoad(Vec<PathBuf>, OpenOptions)

DoLoadScanPaths(Vec<PathBuf>, OpenOptions)

Scan paths and build LazyFrame; then emit DoLoadSchema (phased loading).

DoDownloadHttp(String, OpenOptions)

Perform HTTP download (next loop so “Downloading” can render first). Then emit DoLoadFromHttpTemp.

DoDownloadS3ToTemp(String, OpenOptions)

Perform S3 download to temp (next loop so “Downloading” can render first). Then emit DoLoadFromHttpTemp.

DoDownloadGcsToTemp(String, OpenOptions)

Perform GCS download to temp (next loop so “Downloading” can render first). Then emit DoLoadFromHttpTemp.

DoLoadFromHttpTemp(PathBuf, OpenOptions)

HTTP, S3, or GCS download finished; temp path is ready. Scan it and continue load.

DoLoadSchema(Box<LazyFrame>, Option<PathBuf>, OpenOptions)

Update phase to “Caching schema” and emit DoLoadSchemaBlocking so UI can draw before blocking.

DoLoadSchemaBlocking(Box<LazyFrame>, Option<PathBuf>, OpenOptions)

Actually run collect_schema() and create state; then emit DoLoadBuffer (phased loading).

DoLoadBuffer

First collect() on state; then emit Collect (phased loading).

DoDecompress(Vec<PathBuf>, OpenOptions)

DoExport(PathBuf, ExportFormat, ExportOptions)

DoExportCollect(PathBuf, ExportFormat, ExportOptions)

DoExportWrite(PathBuf, ExportFormat, ExportOptions)

DoLoadParquetMetadata

Exit

Crash(String)

Search(String)

SqlSearch(String)

FuzzySearch(String)

Filter(Vec<FilterStatement>)

Sort(Vec<String>, bool)

ColumnOrder(Vec<String>, usize)

Pivot(PivotSpec)

Melt(MeltSpec)

Export(PathBuf, ExportFormat, ExportOptions)

ChartExport(PathBuf, ChartExportFormat, String)

DoChartExport(PathBuf, ChartExportFormat, String)

Collect

Update

Reset

Resize(u16, u16)

DoScrollDown

DoScrollUp

DoScrollNext

DoScrollPrev

DoScrollEnd

DoScrollHalfDown

DoScrollHalfUp

GoToLine(usize)

AnalysisChunk

Run the next chunk of analysis (describe/distribution); drives per-column progress.

AnalysisDistributionCompute

Run distribution analysis (deferred so progress overlay can show first).

AnalysisCorrelationCompute

Run correlation matrix (deferred so progress overlay can show first).