feat: add option to enable back navigation in Android WebView

Author: dd10-e

demo-shared/src/commonMain/kotlin/io/github/kdroidfilter/webview/demo/App.kt

@@ -60,6 +60,7 @@ fun App() {
             rememberWebViewState("https://httpbin.org/html") {
                 logSeverity = KLogSeverity.Info
                 desktopWebSettings.transparent = true
+                androidWebSettings.goBackEnabled = true
                 backgroundColor = androidx.compose.ui.graphics.Color.White
             }
         val jsBridge = rememberWebViewJsBridge(navigator)

webview-compose/build.gradle.kts

@@ -48,6 +48,7 @@ kotlin {
 
         androidMain.dependencies {
             implementation(libs.kotlinx.coroutinesAndroid)
+            implementation(libs.androidx.activity.compose)
         }
 
         jvmMain.dependencies {

webview-compose/src/androidMain/kotlin/io/github/kdroidfilter/webview/web/WebViewAndroid.kt

@@ -8,6 +8,7 @@ import android.webkit.WebResourceError
 import android.webkit.WebResourceRequest
 import android.webkit.WebView
 import android.webkit.WebViewClient
+import androidx.activity.compose.BackHandler
 import androidx.compose.foundation.layout.BoxWithConstraints
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.remember
@@ -79,6 +80,12 @@ private fun AndroidWebViewContainer(
         val chromeClient = remember { AndroidWebChromeClient(state, navigator) }
         val scope = rememberCoroutineScope()
 
+        BackHandler(
+            enabled = state.webSettings.androidWebSettings.goBackEnabled && navigator.canGoBack,
+        ) {
+            navigator.navigateBack()
+        }
+
         AndroidView(
             factory = { context ->
                 factory(context).apply {

webview-compose/src/commonMain/kotlin/io/github/kdroidfilter/webview/setting/PlatformWebSettings.kt

@@ -10,6 +10,7 @@ sealed class PlatformWebSettings {
         var allowFileAccess: Boolean = false,
         var textZoom: Int = 100,
         var useWideViewPort: Boolean = false,
+        var goBackEnabled: Boolean = false
     ) : PlatformWebSettings()
 
     data class DesktopWebSettings(