---
id: "T:cAlgo.API.ChartVisibilityChangedEventArgs"
kind: "class"
namespace: "cAlgo.API"
url: "https://help.ctrader.com/ctrader-algo/references/EventArgs/ChartVisibilityChangedEventArgs/"
---

> Documentation index for agents: https://help.ctrader.com/ctrader-algo/llms.txt · machine index: https://help.ctrader.com/ctrader-algo/api.json

# ChartVisibilityChangedEventArgs (class)

Provides data for chart visibility changed event

Environments: Desktop supported · CLI not supported · Cloud not supported.

- CLI: Never raised in the CLI: the events that pass it never fire there (Chart.VisibilityChanged).
- Cloud: Never raised in the cloud: the events that pass it never fire there (Chart.VisibilityChanged).

## Definition

```csharp
public class ChartVisibilityChangedEventArgs
```

## Examples

C#:

```csharp
protected override void OnStart()
{
    Chart.VisibilityChanged += OnChartVisibilityChanged;
}

private void OnChartVisibilityChanged(ChartVisibilityChangedEventArgs args)
{
    Print("Chart {0} {1} is visible: {2}", args.Chart.SymbolName, args.Chart.TimeFrame, args.Chart.IsVisible);
}
```

Python:

```python
def on_start(self):
    api.Chart.VisibilityChanged += self.on_chart_visibility_changed

def on_chart_visibility_changed(self, args):
    api.Print(f"Chart {args.Chart.SymbolName} {args.Chart.TimeFrame} is visible: {args.Chart.IsVisible}")
```

## Properties

- `public Chart Chart {get;}` — The chart that event belonges to. [details](https://help.ctrader.com/ctrader-algo/references/EventArgs/ChartVisibilityChangedEventArgs/Chart/index.md)