add default cropper colors for transparent background

Author: SmartToolFactory

app/src/main/java/com/smarttoolfactory/composecropper/MainActivity.kt

@@ -3,6 +3,7 @@ package com.smarttoolfactory.composecropper
 import android.os.Bundle
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
+import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
@@ -20,7 +21,9 @@ class MainActivity : ComponentActivity() {
                     modifier = Modifier.fillMaxSize(),
                     color = MaterialTheme.colorScheme.background
                 ) {
-                    ImageCropDemo()
+                    Column {
+                        ImageCropDemo()
+                    }
                 }
             }
         }

cropper/src/main/java/com/smarttoolfactory/cropper/ImageCropper.kt

@@ -37,6 +37,8 @@ import com.smarttoolfactory.cropper.settings.CropStyle
 import com.smarttoolfactory.cropper.settings.CropType
 import com.smarttoolfactory.cropper.state.DynamicCropState
 import com.smarttoolfactory.cropper.state.rememberCropState
+import com.smarttoolfactory.cropper.ui.theme.BackgroundIdle
+import com.smarttoolfactory.cropper.ui.theme.BackgroundPressed
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.*
@@ -113,15 +115,15 @@ fun ImageCropper(
             keys = resetKeys
         )
 
-        val isTouched = remember(cropState) {
+        val isTouched by remember(cropState) {
             derivedStateOf {
                 cropState is DynamicCropState && handlesTouched(cropState.touchRegion)
             }
         }
 
         val transparentColor by animateColorAsState(
             animationSpec = tween(300, easing = LinearEasing),
-            targetValue = if (isTouched.value) Color(0x66000000) else Color(0x99000000)
+            targetValue = if (isTouched) BackgroundPressed else BackgroundIdle
         )
 
         // Crops image when user invokes crop operation

cropper/src/main/java/com/smarttoolfactory/cropper/ui/theme/Color.kt

@@ -0,0 +1,6 @@
+package com.smarttoolfactory.cropper.ui.theme
+
+import androidx.compose.ui.graphics.Color
+
+val BackgroundPressed = Color(0x66000000)
+val BackgroundIdle = Color(0x99000000)