96 lines
3.6 KiB
Kotlin
96 lines
3.6 KiB
Kotlin
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package com.xscm.modulemain
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import android.graphics.*
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import android.graphics.drawable.Drawable
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/**
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* 这是设置图片设置拉伸区域
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*/
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class FakeNinePatchDrawable(
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private val bitmap: Bitmap,
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// 定义拉伸区域的坐标（相对图片的百分比，范围 0~1）
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private val left: Float, // 左边界（左侧不拉伸区域的宽度比例）
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private val top: Float, // 上边界（上侧不拉伸区域的高度比例）
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private val right: Float, // 右边界（右侧不拉伸区域的宽度比例）
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private val bottom: Float // 下边界（下侧不拉伸区域的高度比例）
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) : Drawable() {
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private val paint = Paint(Paint.ANTI_ALIAS_FLAG)
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private val rect = Rect() // 绘制区域
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override fun draw(canvas: Canvas) {
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val bounds = bounds // 视图的实际尺寸（需要填充的区域）
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val w = bitmap.width
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val h = bitmap.height
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// 计算分割点（像素值）
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val splitLeft = (w * left).toInt()
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val splitTop = (h * top).toInt()
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val splitRight = (w * right).toInt()
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val splitBottom = (h * bottom).toInt()
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// 1. 绘制四个角（不拉伸）
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// 左上
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rect.set(0, 0, splitLeft, splitTop)
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canvas.drawBitmap(bitmap, Rect(0, 0, splitLeft, splitTop), rect, paint)
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// 右上
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rect.set(bounds.width() - (w - splitRight), 0, bounds.width(), splitTop)
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canvas.drawBitmap(bitmap, Rect(splitRight, 0, w, splitTop), rect, paint)
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// 左下
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rect.set(0, bounds.height() - (h - splitBottom), splitLeft, bounds.height())
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canvas.drawBitmap(bitmap, Rect(0, splitBottom, splitLeft, h), rect, paint)
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// 右下
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rect.set(
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bounds.width() - (w - splitRight),
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bounds.height() - (h - splitBottom),
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bounds.width(),
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bounds.height()
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)
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canvas.drawBitmap(bitmap, Rect(splitRight, splitBottom, w, h), rect, paint)
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// 2. 绘制四条边（单向拉伸）
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// 上边（水平拉伸）
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rect.set(splitLeft, 0, bounds.width() - (w - splitRight), splitTop)
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canvas.drawBitmap(bitmap, Rect(splitLeft, 0, splitRight, splitTop), rect, paint)
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// 下边（水平拉伸）
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rect.set(
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splitLeft,
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bounds.height() - (h - splitBottom),
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bounds.width() - (w - splitRight),
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bounds.height()
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)
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canvas.drawBitmap(bitmap, Rect(splitLeft, splitBottom, splitRight, h), rect, paint)
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// 左边（垂直拉伸）
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rect.set(0, splitTop, splitLeft, bounds.height() - (h - splitBottom))
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canvas.drawBitmap(bitmap, Rect(0, splitTop, splitLeft, splitBottom), rect, paint)
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// 右边（垂直拉伸）
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rect.set(
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bounds.width() - (w - splitRight),
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splitTop,
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bounds.width(),
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bounds.height() - (h - splitBottom)
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)
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canvas.drawBitmap(bitmap, Rect(splitRight, splitTop, w, splitBottom), rect, paint)
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// 3. 绘制中间区域（双向拉伸）
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rect.set(
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splitLeft,
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splitTop,
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bounds.width() - (w - splitRight),
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bounds.height() - (h - splitBottom)
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)
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canvas.drawBitmap(bitmap, Rect(splitLeft, splitTop, splitRight, splitBottom), rect, paint)
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}
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override fun setAlpha(alpha: Int) {
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paint.alpha = alpha
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invalidateSelf()
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}
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override fun getOpacity(): Int = PixelFormat.TRANSLUCENT
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override fun getAlpha(): Int = paint.alpha
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override fun setColorFilter(colorFilter: ColorFilter?) {
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paint.colorFilter = colorFilter
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invalidateSelf()
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}
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}
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