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MessageContent.kt
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MessageContent.kt
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package jetbrains.livemap.canvascontrols
import jetbrains.datalore.base.geometry.DoubleVector
import jetbrains.datalore.visualization.base.canvas.CanvasControl
import jetbrains.datalore.visualization.base.canvas.CanvasControlUtil.drawLater
import jetbrains.datalore.visualization.base.canvas.Context2d
import jetbrains.datalore.visualization.base.canvas.Context2d.TextAlign
import jetbrains.datalore.visualization.base.canvas.Context2d.TextBaseline
import jetbrains.datalore.visualization.base.canvas.SingleCanvasControl
import kotlin.math.max
internal class MessageContent(private val message: String) : CanvasContent {
private lateinit var canvasControl: SingleCanvasControl
override fun show(parentControl: CanvasControl) {
canvasControl = SingleCanvasControl(parentControl)
with(canvasControl.createCanvas()) {
drawText(context2d, DoubleVector(size.x.toDouble(), size.y.toDouble()))
takeSnapshot()
.onSuccess { snapshot ->
drawLater(parentControl) {
canvasControl.context.drawImage(
snapshot,
0.0,
0.0
)
}
}
}
}
override fun hide() {
canvasControl.dispose()
}
private fun drawText(context: Context2d, dimension: DoubleVector) =
with(context) {
val lines: List<String> = message.split("\n")
save()
setFillColor(BACKGROUND_COLOR)
fillRect(0.0, 0.0, dimension.x, dimension.y)
setTextBaseline(TextBaseline.TOP)
setTextAlign(TextAlign.LEFT)
setFillColor(FONT_COLOR)
setFont("400 " + FONT_SIZE + "px/" + FONT_HEIGHT + "px Helvetica, Arial, sans-serif")
val height = FONT_HEIGHT * lines.size
var width = 0.0
lines.forEach { width = max(width, measureText(it)) }
lines.indices.forEach {
fillText(lines[it], (dimension.x - width) / 2, (dimension.y - height) / 2 + it * FONT_HEIGHT)
}
restore()
}
companion object {
private const val FONT_SIZE = 17.0
private const val FONT_HEIGHT = 21.25
private const val FONT_COLOR = "#B3B3B3"
private const val BACKGROUND_COLOR = "#FFFFFF"
}
}