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Full screen Android apps using simple Kotlin DSL

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# 🌖 Edge-to-Edge 
In meanwhile, here is an Android library for enabling [edge-to-edge content](https://developer.android.com/guide/navigation/gesturenav) and insetting views using simple Kotlin DSL.

# Getting Started
1. Configure transparent colors of the status and navigation bars in `res/values/styles.xml` by extending a theme without the action bar like `Theme.MaterialComponents.Light.NoActionBar` or `Theme.Design.Light.NoActionBar` or similar.

```xml
<resources>
    <style name="AppTheme" parent="Theme.MaterialComponents.Light.NoActionBar">
        ...
        <item name="android:windowDrawsSystemBarBackgrounds">true</item>
        <item name="android:windowTranslucentStatus">false</item>
        <item name="android:windowTranslucentNavigation">false</item>
        <item name="android:statusBarColor">@color/statusBar</item>
        <item name="android:navigationBarColor">@color/navigationBar</item>
    </style>
    
    <color name="statusBar">@android:color/transparent</color>
    <color name="navigationBar">@android:color/transparent</color>
</resources>
```
☝️ Note that fully transparent navigation bar can cause contrast issues to the navigation icons for API level `[23..29)`. Check [Navigation Bar Transparency](https://github.com/beworker/edge-to-edge/wiki/Navigation-Bar-Transparency) wiki page for more details.

2. Remove `android:fitSystemWindows` attribute everywhere from layouts, if present.
3. Fit top and bottom views of each fragment or activity as needed.

```kotlin
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    edgeToEdge {
        appbar.fit { Edge.Left + Edge.Top + Edge.Right }
        recycler.fit { Edge.Bottom }
    }
    ...
}
```

See sample app for more edge-to-edge examples.

# Download
```gradle
repositories {
    mavenCentral()
}
dependencies {
    implementation 'de.halfbit:edge-to-edge:<version>'
}
```

# How
The library is implemented around [WindowInsets](https://developer.android.com/reference/android/view/WindowInsets) class. Each time `WindowInsets` are dispatched through out the view hierarchy, the library fits views according to the declared fitting rules.

Edge-to-Edge library fits each view to one or more device edges by modifying its `padding`, `margin` or `height` attribute with  the values taken from the current `WindowInsets`. Padding and margin attributes preserve their original values defined in layout and inset values are added to them. The library "auto-detects" the attrbitute to modify, which can be overridden by using `fitPadding`, `fitMargin` or `fitHeight` convenience functions.

# Features
* Easiness of use - padding, margin or height can be adjusted to any edge with a single line of code.
* Convenient default parameters for common elements like recycler view, scroll view, floating actions button etc.
* Ability to remove fitting rules, which comes handy when working with transitions in `ConstraintLayout`.
* Demo app with edge-to-edge examples (any kind of contribution is welcome).

# Similar libraries
* [chrisbanes/insetter](https://github.com/chrisbanes/insetter)

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
```

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