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172 changes: 172 additions & 0 deletions
172
bannerview/src/main/java/com/zhpan/bannerview/indicator/DrawableIndicator.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,172 @@ | ||
| package com.zhpan.bannerview.indicator | ||
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| import android.content.Context | ||
| import android.graphics.* | ||
| import android.os.Build | ||
| import android.util.AttributeSet | ||
| import androidx.annotation.DrawableRes | ||
| import androidx.core.content.ContextCompat | ||
| import androidx.core.graphics.drawable.DrawableCompat | ||
| import com.zhpan.indicator.base.BaseIndicatorView | ||
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| /** | ||
| * @ author : zhouweibin | ||
| * @ time: 2019/12/18 17:04. | ||
| * @ desc: 选中与未选中的图片长宽可能不一样 | ||
| */ | ||
| class DrawableIndicator @JvmOverloads constructor(context: Context?, attrs: AttributeSet? = null, defStyleAttr: Int = 0) : BaseIndicatorView(context!!, attrs, defStyleAttr) { | ||
| // 选中时的Bitmap | ||
| private var mCheckedBitmap: Bitmap? = null | ||
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| // 未选中时的Bitmap | ||
| private var mNormalBitmap: Bitmap? = null | ||
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| // 图片之间的间距 | ||
| private var mIndicatorPadding = 0 | ||
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| // 选中图片的宽度 | ||
| private var mCheckedBitmapWidth = 0 | ||
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| // 选中图片的高度 | ||
| private var mCheckedBitmapHeight = 0 | ||
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| //未选中图片的宽高 | ||
| private var mNormalBitmapWidth = 0 | ||
| private var mNormalBitmapHeight = 0 | ||
| private var mIndicatorSize: IndicatorSize? = null | ||
| private var normalCanResize = true | ||
| private var checkCanResize = true | ||
| override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) { | ||
| super.onMeasure(widthMeasureSpec, heightMeasureSpec) | ||
| val maxHeight = mCheckedBitmapHeight.coerceAtLeast(mNormalBitmapHeight) | ||
| val realWidth = mCheckedBitmapWidth + (mNormalBitmapWidth + mIndicatorPadding) * (getPageSize() - 1) | ||
| setMeasuredDimension(realWidth, maxHeight) | ||
| } | ||
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| override fun onDraw(canvas: Canvas) { | ||
| super.onDraw(canvas) | ||
| if (getPageSize() > 1 && mCheckedBitmap != null && mNormalBitmap != null) { | ||
| for (i in 1 until getPageSize() + 1) { | ||
| var left: Int | ||
| var top: Int | ||
| var bitmap = mNormalBitmap | ||
| val index = i - 1 | ||
| when { | ||
| index < getCurrentPosition() -> { | ||
| left = (i - 1) * (mNormalBitmapWidth + mIndicatorPadding) | ||
| top = measuredHeight / 2 - mNormalBitmapHeight / 2 | ||
| } | ||
| index == getCurrentPosition() -> { | ||
| left = (i - 1) * (mNormalBitmapWidth + mIndicatorPadding) | ||
| top = measuredHeight / 2 - mCheckedBitmapHeight / 2 | ||
| bitmap = mCheckedBitmap | ||
| } | ||
| else -> { | ||
| left = (i - 1) * mIndicatorPadding + (i - 2) * mNormalBitmapWidth + mCheckedBitmapWidth | ||
| top = measuredHeight / 2 - mNormalBitmapHeight / 2 | ||
| } | ||
| } | ||
| drawIcon(canvas, left, top, bitmap) | ||
| } | ||
| } | ||
| } | ||
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| override fun rotateCanvas(canvas: Canvas) { | ||
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| } | ||
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| private fun drawIcon(canvas: Canvas, left: Int, top: Int, icon: Bitmap?) { | ||
| if (icon == null) { | ||
| return | ||
| } | ||
| canvas.drawBitmap(icon, left.toFloat(), top.toFloat(), null) | ||
| } | ||
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| private fun initIconSize() { | ||
| mCheckedBitmap?.let { | ||
| mIndicatorSize?.let { | ||
| if (mCheckedBitmap!!.isMutable && checkCanResize) { | ||
| mCheckedBitmap!!.width = mIndicatorSize!!.checkedWidth | ||
| mCheckedBitmap!!.height = mIndicatorSize!!.checkedHeight | ||
| } else { | ||
| val width = mCheckedBitmap!!.width | ||
| val height = mCheckedBitmap!!.height | ||
| val scaleWidth = mIndicatorSize!!.checkedWidth.toFloat() / width | ||
| val scaleHeight = mIndicatorSize!!.checkedHeight.toFloat() / height | ||
| val matrix = Matrix() | ||
| matrix.postScale(scaleWidth, scaleHeight) | ||
| mCheckedBitmap = Bitmap.createBitmap(mCheckedBitmap!!, 0, 0, width, height, matrix, true) | ||
| } | ||
| } | ||
| mCheckedBitmapWidth = mCheckedBitmap!!.width | ||
| mCheckedBitmapHeight = mCheckedBitmap!!.height | ||
| } | ||
| mNormalBitmap?.let { | ||
| mIndicatorSize?.let { | ||
| if (mNormalBitmap!!.isMutable && normalCanResize) { | ||
| mNormalBitmap!!.width = mIndicatorSize!!.normalWidth | ||
| mNormalBitmap!!.height = mIndicatorSize!!.normalHeight | ||
| } else { | ||
| val width = mNormalBitmap!!.width | ||
| val height = mNormalBitmap!!.height | ||
| val scaleWidth = mIndicatorSize!!.normalWidth.toFloat() / mNormalBitmap!!.width | ||
| val scaleHeight = mIndicatorSize!!.normalHeight.toFloat() / mNormalBitmap!!.height | ||
| val matrix = Matrix() | ||
| matrix.postScale(scaleWidth, scaleHeight) | ||
| mNormalBitmap = Bitmap.createBitmap(mNormalBitmap!!, 0, 0, width, height, matrix, true) | ||
| } | ||
| } | ||
| mNormalBitmapWidth = mNormalBitmap!!.width | ||
| mNormalBitmapHeight = mNormalBitmap!!.height | ||
| } | ||
| } | ||
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| fun setIndicatorDrawable(@DrawableRes normalDrawable: Int, @DrawableRes checkedDrawable: Int): DrawableIndicator { | ||
| mNormalBitmap = BitmapFactory.decodeResource(resources, normalDrawable) | ||
| mCheckedBitmap = BitmapFactory.decodeResource(resources, checkedDrawable) | ||
| if (mNormalBitmap == null) { | ||
| mNormalBitmap = getBitmapFromVectorDrawable(context, normalDrawable) | ||
| normalCanResize = false | ||
| } | ||
| if (mCheckedBitmap == null) { | ||
| mCheckedBitmap = getBitmapFromVectorDrawable(context, checkedDrawable) | ||
| checkCanResize = false | ||
| } | ||
| initIconSize() | ||
| postInvalidate() | ||
| return this | ||
| } | ||
|
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| fun setIndicatorSize(normalWidth: Int, normalHeight: Int, checkedWidth: Int, checkedHeight: Int): DrawableIndicator { | ||
| mIndicatorSize = IndicatorSize(normalWidth, normalHeight, checkedWidth, checkedHeight) | ||
| initIconSize() | ||
| postInvalidate() | ||
| return this | ||
| } | ||
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| fun setIndicatorGap(padding: Int): DrawableIndicator { | ||
| if (padding >= 0) { | ||
| mIndicatorPadding = padding | ||
| postInvalidate() | ||
| } | ||
| return this | ||
| } | ||
|
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| internal class IndicatorSize(var normalWidth: Int, var normalHeight: Int, var checkedWidth: Int, var checkedHeight: Int) | ||
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| private fun getBitmapFromVectorDrawable(context: Context, drawableId: Int): Bitmap? { | ||
| var drawable = ContextCompat.getDrawable(context, drawableId) | ||
| drawable?.let { | ||
| if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) { | ||
| drawable = DrawableCompat.wrap(drawable!!).mutate() | ||
| } | ||
| val bitmap = Bitmap.createBitmap(drawable!!.intrinsicWidth, | ||
| drawable!!.intrinsicHeight, Bitmap.Config.ARGB_8888) | ||
| val canvas = Canvas(bitmap) | ||
| drawable!!.setBounds(0, 0, canvas.width, canvas.height) | ||
| drawable!!.draw(canvas) | ||
| return bitmap | ||
| } | ||
| return null | ||
| } | ||
| } |
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