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Implement a fully functional (but minimal) canvas overlay
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150 changes: 150 additions & 0 deletions
150
app/src/main/java/com/bnyro/recorder/ui/views/Canvas.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,150 @@ | ||
| package com.bnyro.recorder.ui.views | ||
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| import androidx.compose.foundation.Canvas | ||
| import androidx.compose.foundation.gestures.awaitEachGesture | ||
| import androidx.compose.foundation.gestures.awaitFirstDown | ||
| import androidx.compose.foundation.layout.fillMaxSize | ||
| import androidx.compose.runtime.Composable | ||
| import androidx.compose.runtime.getValue | ||
| import androidx.compose.runtime.mutableStateListOf | ||
| import androidx.compose.runtime.mutableStateOf | ||
| import androidx.compose.runtime.remember | ||
| import androidx.compose.runtime.setValue | ||
| import androidx.compose.ui.Modifier | ||
| import androidx.compose.ui.geometry.Offset | ||
| import androidx.compose.ui.graphics.BlendMode | ||
| import androidx.compose.ui.graphics.Color | ||
| import androidx.compose.ui.graphics.Path | ||
| import androidx.compose.ui.graphics.StrokeCap | ||
| import androidx.compose.ui.graphics.StrokeJoin | ||
| import androidx.compose.ui.graphics.drawscope.DrawScope | ||
| import androidx.compose.ui.graphics.drawscope.Stroke | ||
| import androidx.compose.ui.graphics.nativeCanvas | ||
| import androidx.compose.ui.input.pointer.pointerInput | ||
| import androidx.compose.ui.input.pointer.positionChange | ||
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| enum class MotionEvent { | ||
| Up, Down, Idle, Move | ||
| } | ||
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| enum class DrawMode { | ||
| Pen, Eraser | ||
| } | ||
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| @Composable | ||
| fun MainCanvas() { | ||
| val paths = remember { | ||
| mutableStateListOf<PathProperties>() | ||
| } | ||
| val pathsUndone = remember { mutableStateListOf<PathProperties>() } | ||
| var motionEvent by remember { mutableStateOf(MotionEvent.Idle) } | ||
| var currentPath by remember { mutableStateOf(PathProperties()) } | ||
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| var currentPosition by remember { mutableStateOf(Offset.Unspecified) } | ||
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| val drawModifier = Modifier | ||
| .fillMaxSize() | ||
| .pointerInput(Unit) { | ||
| awaitEachGesture { | ||
| val downEvent = awaitFirstDown() | ||
| currentPosition = downEvent.position | ||
| motionEvent = MotionEvent.Down | ||
| if (downEvent.pressed != downEvent.previousPressed) downEvent.consume() | ||
| do { | ||
| val event = awaitPointerEvent() | ||
| if (event.changes.size == 1) { | ||
| currentPosition = event.changes[0].position | ||
| motionEvent = MotionEvent.Move | ||
| if (event.changes[0].positionChange() != Offset.Zero) event.changes[0].consume() | ||
| } | ||
| } while (event.changes.any { it.pressed }) | ||
| motionEvent = MotionEvent.Up | ||
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| } | ||
| } | ||
| Canvas(modifier = drawModifier) { | ||
| with(drawContext.canvas.nativeCanvas) { | ||
| val checkPoint = saveLayer(null, null) | ||
| when (motionEvent) { | ||
| MotionEvent.Idle -> Unit | ||
| MotionEvent.Down -> { | ||
| paths.add(currentPath) | ||
| currentPath.path.moveTo( | ||
| currentPosition.x, currentPosition.y | ||
| ) | ||
| } | ||
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| MotionEvent.Move -> { | ||
| currentPath.path.lineTo( | ||
| currentPosition.x, currentPosition.y | ||
| ) | ||
| drawCircle( | ||
| center = currentPosition, | ||
| color = Color.Gray, | ||
| radius = currentPath.strokeWidth / 2, | ||
| style = Stroke( | ||
| width = 1f | ||
| ) | ||
| ) | ||
| } | ||
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| MotionEvent.Up -> { | ||
| currentPath.path.lineTo( | ||
| currentPosition.x, currentPosition.y | ||
| ) | ||
| currentPath = PathProperties( | ||
| path = Path(), | ||
| strokeWidth = currentPath.strokeWidth, | ||
| color = currentPath.color, | ||
| drawMode = currentPath.drawMode | ||
| ) | ||
| pathsUndone.clear() | ||
| currentPosition = Offset.Unspecified | ||
| motionEvent = MotionEvent.Idle | ||
| } | ||
| } | ||
| paths.forEach { path -> | ||
| path.draw(this@Canvas) | ||
| } | ||
| restoreToCount(checkPoint) | ||
| } | ||
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| } | ||
| } | ||
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| class PathProperties( | ||
| var path: Path = Path(), | ||
| var strokeWidth: Float = 10f, | ||
| var color: Color = Color.Red, | ||
| var drawMode: DrawMode = DrawMode.Pen | ||
| ) { | ||
| fun draw(scope: DrawScope) { | ||
| when (drawMode) { | ||
| DrawMode.Pen -> { | ||
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| scope.drawPath( | ||
| color = color, | ||
| path = path, | ||
| style = Stroke( | ||
| width = strokeWidth, | ||
| cap = StrokeCap.Round, | ||
| join = StrokeJoin.Round | ||
| ) | ||
| ) | ||
| } | ||
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| DrawMode.Eraser -> { | ||
| scope.drawPath( | ||
| color = Color.Transparent, | ||
| path = path, | ||
| style = Stroke( | ||
| width = strokeWidth, | ||
| cap = StrokeCap.Round, | ||
| join = StrokeJoin.Round | ||
| ), | ||
| blendMode = BlendMode.Clear | ||
| ) | ||
| } | ||
| } | ||
| } | ||
| } |
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28 changes: 28 additions & 0 deletions
28
app/src/main/java/com/bnyro/recorder/ui/views/OverlayView.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| package com.bnyro.recorder.ui.views | ||
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| import androidx.compose.foundation.layout.Box | ||
| import androidx.compose.foundation.layout.Row | ||
| import androidx.compose.foundation.layout.fillMaxSize | ||
| import androidx.compose.material.icons.Icons | ||
| import androidx.compose.material.icons.filled.Close | ||
| import androidx.compose.material3.Card | ||
| import androidx.compose.material3.Icon | ||
| import androidx.compose.material3.IconButton | ||
| import androidx.compose.runtime.Composable | ||
| import androidx.compose.ui.Alignment | ||
| import androidx.compose.ui.Modifier | ||
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| @Composable | ||
| fun OverlayView(onDismissRequest: () -> Unit) { | ||
| Box(Modifier.fillMaxSize()) { | ||
| MainCanvas() | ||
| Card(Modifier.align(Alignment.TopEnd)) { | ||
| Row { | ||
| IconButton(onClick = { onDismissRequest() }) { | ||
| Icon(Icons.Default.Close, "Close Overlay") | ||
| } | ||
| } | ||
| } | ||
| } | ||
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|
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| } |