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217 changes: 217 additions & 0 deletions
217
...rc/main/java/com/smarttoolfactory/composecolorpicker/demo/ColorDetectionFromScreenDemo.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,217 @@ | ||
| package com.smarttoolfactory.composecolorpicker.demo | ||
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| import android.graphics.Bitmap | ||
| import android.graphics.Canvas | ||
| import androidx.compose.foundation.* | ||
| import androidx.compose.foundation.gestures.detectDragGestures | ||
| import androidx.compose.foundation.layout.* | ||
| import androidx.compose.foundation.shape.RoundedCornerShape | ||
| import androidx.compose.material.Button | ||
| import androidx.compose.material.Text | ||
| import androidx.compose.runtime.* | ||
| import androidx.compose.ui.Modifier | ||
| import androidx.compose.ui.draw.clip | ||
| import androidx.compose.ui.draw.drawWithContent | ||
| import androidx.compose.ui.geometry.Offset | ||
| import androidx.compose.ui.geometry.Rect | ||
| import androidx.compose.ui.graphics.Color | ||
| import androidx.compose.ui.graphics.ImageBitmap | ||
| import androidx.compose.ui.graphics.drawscope.Stroke | ||
| import androidx.compose.ui.graphics.isUnspecified | ||
| import androidx.compose.ui.input.pointer.PointerInputChange | ||
| import androidx.compose.ui.input.pointer.pointerInput | ||
| import androidx.compose.ui.layout.* | ||
| import androidx.compose.ui.platform.LocalContext | ||
| import androidx.compose.ui.platform.LocalView | ||
| import androidx.compose.ui.res.imageResource | ||
| import androidx.compose.ui.unit.dp | ||
| import androidx.compose.ui.unit.sp | ||
| import com.smarttoolfactory.colorpicker.ui.Blue400 | ||
| import com.smarttoolfactory.composecolorpicker.R | ||
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| @Composable | ||
| fun ColorDetectionFromScreenDemo() { | ||
| // These are for debugging | ||
| var text by remember { mutableStateOf("") } | ||
| var colorAtTouchPosition by remember { mutableStateOf(Color.Unspecified) } | ||
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| Column( | ||
| modifier = Modifier | ||
| .fillMaxSize() | ||
| .verticalScroll(rememberScrollState()) | ||
| ) { | ||
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| Box( | ||
| modifier = Modifier | ||
| .fillMaxWidth() | ||
| .height(100.dp) | ||
| ) | ||
| Text( | ||
| text = "Simple demonstration to detect colors in ImageColorDetection composable " + | ||
| "covered with green border. Bitmap of the composable is created when after " + | ||
| "globally positioned", | ||
| fontSize = 14.sp, | ||
| color = Blue400, | ||
| modifier = Modifier.padding(2.dp) | ||
| ) | ||
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| ImageColorDetection( | ||
| modifier=Modifier.padding(10.dp), | ||
| content = { | ||
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| Column( | ||
| modifier = Modifier | ||
| .border(2.dp, Color.Green) | ||
| .padding(5.dp) | ||
| ) { | ||
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| Image( | ||
| bitmap = ImageBitmap.imageResource( | ||
| LocalContext.current.resources, | ||
| R.drawable.landscape | ||
| ), | ||
| contentDescription = null, | ||
| modifier = Modifier | ||
| .background(Color.LightGray) | ||
| .fillMaxWidth() | ||
| // This is for displaying different ratio, optional | ||
| .aspectRatio(4f / 3), | ||
| contentScale = ContentScale.Crop | ||
| ) | ||
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| Button(onClick = { /*TODO*/ }) { | ||
| Text("Sample Button") | ||
| } | ||
| } | ||
| }, | ||
| { colorChange: Color, textChange: String -> | ||
| colorAtTouchPosition = colorChange | ||
| text = textChange | ||
| }, | ||
|
|
||
| ) | ||
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| Text(text = text) | ||
| Box( | ||
| modifier = Modifier | ||
| .then( | ||
| if (colorAtTouchPosition.isUnspecified) { | ||
| Modifier | ||
| } else { | ||
| Modifier | ||
| .clip(RoundedCornerShape(20)) | ||
| .border(2.dp, Color.Black, shape = RoundedCornerShape(20)) | ||
| .background(colorAtTouchPosition) | ||
| } | ||
| ) | ||
| .size(100.dp) | ||
|
|
||
| ) | ||
| } | ||
| } | ||
|
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| @Composable | ||
| private fun ImageColorDetection( | ||
| modifier: Modifier=Modifier, | ||
| content: @Composable () -> Unit, | ||
| onColorChange: (Color, String) -> Unit, | ||
| ) { | ||
|
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| val view = LocalView.current | ||
|
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| var offsetX by remember { mutableStateOf(0f) } | ||
| var offsetY by remember { mutableStateOf(0f) } | ||
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| var color by remember { mutableStateOf(Color.Unspecified) } | ||
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| var composableBounds by remember { | ||
| mutableStateOf<Rect?>(null) | ||
| } | ||
| var bitmap by remember { | ||
| mutableStateOf<Bitmap?>( | ||
| null | ||
| ) | ||
| } | ||
|
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| DisposableEffect(Unit) { | ||
| onDispose { | ||
| bitmap?.apply { | ||
| if (!isRecycled) recycle() | ||
| bitmap = null | ||
| } | ||
| } | ||
| } | ||
|
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| val colorDetectionModifier = modifier | ||
| .pointerInput(Unit) { | ||
| detectDragGestures(onDrag = { change: PointerInputChange, _: Offset -> | ||
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| if (composableBounds == null) return@detectDragGestures | ||
|
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| if (bitmap == null) { | ||
| val boundsRect = composableBounds!! | ||
|
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| bitmap = Bitmap.createBitmap( | ||
| boundsRect.width.toInt(), | ||
| boundsRect.height.toInt(), | ||
| Bitmap.Config.ARGB_8888 | ||
| ) | ||
|
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| bitmap?.let { bmp -> | ||
| val canvas = Canvas(bmp) | ||
| .apply { | ||
| translate(-boundsRect.left, -boundsRect.top) | ||
| } | ||
| view.draw(canvas) | ||
| } | ||
| } | ||
|
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| val bmp: Bitmap = bitmap!! | ||
| val bitmapWidth = bmp.width | ||
| val bitmapHeight = bmp.height | ||
|
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| // Touch coordinates on image | ||
| offsetX = change.position.x.coerceIn(0f, bitmapWidth.toFloat()) | ||
| offsetY = change.position.y.coerceIn(0f, bitmapHeight.toFloat()) | ||
|
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| // Scale from Image touch coordinates to range in Bitmap | ||
| val scaledX = offsetX | ||
| val scaledY = offsetY | ||
|
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| try { | ||
| val pixel: Int = bmp.getPixel(scaledX.toInt(), scaledY.toInt()) | ||
|
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| val red = android.graphics.Color.red(pixel) | ||
| val green = android.graphics.Color.green(pixel) | ||
| val blue = android.graphics.Color.blue(pixel) | ||
|
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| val text = "Touch offsetX:$offsetX, offsetY: $offsetY\n" + | ||
| "Bitmap width: ${bitmapWidth}, height: $bitmapHeight\n" + | ||
| "scaledX: $scaledX, scaledY: $scaledY\n" + | ||
| "red: $red, green: $green, blue: $blue\n" | ||
|
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| color = Color(red, green, blue) | ||
|
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| onColorChange(color, text) | ||
| } catch (e: Exception) { | ||
| println("Exception e: ${e.message}") | ||
| } | ||
| } | ||
| ) | ||
| } | ||
| .drawWithContent { | ||
| drawContent() | ||
| val center = Offset(offsetX, offsetY) | ||
| drawCircle(Color.Black, radius = 20f, style = Stroke(16f), center = center) | ||
| drawCircle(Color.White, radius = 20f, style = Stroke(14f), center = center) | ||
| } | ||
| .onGloballyPositioned { | ||
| composableBounds = it.boundsInRoot() | ||
| } | ||
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| Column(modifier = colorDetectionModifier) { | ||
| content() | ||
| } | ||
| } |
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