81 lines
2.3 KiB
Kotlin
81 lines
2.3 KiB
Kotlin
package jp.juggler.subwaytooter.actmain
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import android.content.Context
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import android.graphics.Canvas
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import android.graphics.Paint
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import android.graphics.Rect
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import android.util.AttributeSet
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import android.widget.LinearLayout
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// 画面下のカラムストリップのLinearLayout
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// 可視範囲を示すインジケーターを表示する
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class ColumnStripLinearLayout : LinearLayout {
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// 可視範囲
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private var visibleFirst: Int = 0
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private var visibleLast: Int = 0
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private var visibleSlideRatio: Float = 0.toFloat()
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// インジケーターの高さ
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private val indicatorHeight: Int
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// インジケーターの色
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var indicatorColor: Int = 0
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set(value) {
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if (field != value) {
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field = value
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invalidate()
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}
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}
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init {
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indicatorHeight = (0.5f + 2f * resources.displayMetrics.density).toInt()
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}
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constructor(context: Context) : super(context)
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constructor(context: Context, attrs: AttributeSet?) : super(context, attrs)
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constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(
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context,
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attrs,
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defStyleAttr
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)
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fun setVisibleRange(first: Int, last: Int, slideRatio: Float) {
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if (this.visibleFirst == first &&
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this.visibleLast == last &&
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this.visibleSlideRatio == slideRatio
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) return
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this.visibleFirst = first
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this.visibleLast = last
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this.visibleSlideRatio = slideRatio
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invalidate()
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}
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private val paint = Paint()
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private val rect = Rect()
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override fun dispatchDraw(canvas: Canvas) {
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super.dispatchDraw(canvas)
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if (visibleFirst < 0 || visibleLast >= childCount) return
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val childFirst = getChildAt(visibleFirst)
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val childLast = getChildAt(visibleLast)
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val x = if (visibleSlideRatio != 0f) {
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(0.5f + visibleSlideRatio * childFirst.width).toInt()
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} else {
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0
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}
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rect.left = childFirst.left + x
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rect.right = childLast.right + x
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rect.top = 0
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rect.bottom = indicatorHeight
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paint.color = indicatorColor
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canvas.drawRect(rect, paint)
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}
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}
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