toolbar-demo

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# Jetpack compose toolbar actions demo

Before Jetpack Compose release we were used to add menu items in Fragments or Activities classes 
with **xml** files and **onCreateOptionsMenu** methods.

The new UI tool is a game changer and via **Scaffold** composable it's easy to add global actions 
to **TopAppBar**. With global actions I mean items that remains visible for the entire lifecycle of the controller class. 
When using Jetpack Navigation however there is only one Activity and the NavHost swaps composable destinations on the screen.

In this scenario is useful to have a concise way to easily add or remove actions from the ToolBar 
for each navigation route. This sample project aims to resolve this problem.

https://user-images.githubusercontent.com/20385374/171950954-90b2c662-39ed-48ce-9e78-a9d261497d6d.mp4

Define a toolbarController instance (Hoist instance as up as possible)

```kotlin
val toolbarController = rememberToolbarController()

val screenToolbarActions by remember { 
    derivedStateOf {
        val route = currentBackStackEntry?.destination?.route ?: ""
        toolbarController.getToolbarActions(route = route)
    }
}

...
Scaffold(
    topBar = {
        TopAppBar {
            ToolbarContent(
                ...
                screenAdditionalToolbarActions = screenToolbarActions,
                navController = navController
            )
        }
    }
)
...
```

In composable Destination define toolbar items
```kotlin
@Composable
fun FirstScreen(
    toolbarController: ToolbarController = rememberToolbarController()
) {

toolbarController.SetActions(  
        route = NavGraph.FIRST_SCREEN_ROUTE,  
        actions = listOf(ToolbarAction.OpenSettings { 
            Toast.makeText(context, "Settings Action", Toast.LENGTH_SHORT).show()  
        })  
    )
}
```

toolbar-demo

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