---
id: "E:cAlgo.API.Frame.SizeChanged"
kind: "event"
type: "T:cAlgo.API.Frame"
url: "https://help.ctrader.com/ctrader-algo/references/Plugin/Chart/Frame/SizeChanged/"
---

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

# Frame.SizeChanged

Member of [Frame](https://help.ctrader.com/ctrader-algo/references/Plugin/Chart/Frame/index.md).

## SizeChanged

Occurs when frame size changes.

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

- CLI: Available to plugins only, and plugins cannot run in the CLI.
- Cloud: Available to plugins only, and plugins cannot run in the cloud.

C#:

```csharp
event Action<FrameSizeChangedEventArgs> SizeChanged;
```

Python:

```python
frame.SizeChanged += handler  # handler(obj: FrameSizeChangedEventArgs)
```

### Returns

`Action<FrameSizeChangedEventArgs>` — 

### Examples

C#:

```csharp
protected override void OnStart()
{
    var customFrame = ChartManager.AddCustomFrame("My Frame");
    customFrame.SizeChanged += OnFrameSizeChanged;
}

private void OnFrameSizeChanged(FrameSizeChangedEventArgs args)
{
    Print("Frame {0} size: {1}x{2}", args.Frame.Id, args.Frame.Width, args.Frame.Height);
}
```

Python:

```python
def on_start(self):
    customFrame = api.ChartManager.AddCustomFrame("My Frame")
    customFrame.SizeChanged += self.on_frame_size_changed

def on_frame_size_changed(self, args):
    api.Print(f"Frame {args.Frame.Id} size: {args.Frame.Width}x{args.Frame.Height}")
```