package com.xscm.modulemain

import android.graphics.*
import android.graphics.drawable.Drawable

/**
 * 这是设置图片设置拉伸区域
 */
class FakeNinePatchDrawable(
    private val bitmap: Bitmap,
    // 定义拉伸区域的坐标（相对图片的百分比，范围 0~1）
    private val left: Float,   // 左边界（左侧不拉伸区域的宽度比例）
    private val top: Float,    // 上边界（上侧不拉伸区域的高度比例）
    private val right: Float,  // 右边界（右侧不拉伸区域的宽度比例）
    private val bottom: Float  // 下边界（下侧不拉伸区域的高度比例）
) : Drawable() {

    private val paint = Paint(Paint.ANTI_ALIAS_FLAG)
    private val rect = Rect() // 绘制区域

    override fun draw(canvas: Canvas) {
        val bounds = bounds // 视图的实际尺寸（需要填充的区域）
        val w = bitmap.width
        val h = bitmap.height

        // 计算分割点（像素值）
        val splitLeft = (w * left).toInt()
        val splitTop = (h * top).toInt()
        val splitRight = (w * right).toInt()
        val splitBottom = (h * bottom).toInt()

        // 1. 绘制四个角（不拉伸）
        // 左上
        rect.set(0, 0, splitLeft, splitTop)
        canvas.drawBitmap(bitmap, Rect(0, 0, splitLeft, splitTop), rect, paint)
        // 右上
        rect.set(bounds.width() - (w - splitRight), 0, bounds.width(), splitTop)
        canvas.drawBitmap(bitmap, Rect(splitRight, 0, w, splitTop), rect, paint)
        // 左下
        rect.set(0, bounds.height() - (h - splitBottom), splitLeft, bounds.height())
        canvas.drawBitmap(bitmap, Rect(0, splitBottom, splitLeft, h), rect, paint)
        // 右下
        rect.set(
            bounds.width() - (w - splitRight),
            bounds.height() - (h - splitBottom),
            bounds.width(),
            bounds.height()
        )
        canvas.drawBitmap(bitmap, Rect(splitRight, splitBottom, w, h), rect, paint)

        // 2. 绘制四条边（单向拉伸）
        // 上边（水平拉伸）
        rect.set(splitLeft, 0, bounds.width() - (w - splitRight), splitTop)
        canvas.drawBitmap(bitmap, Rect(splitLeft, 0, splitRight, splitTop), rect, paint)
        // 下边（水平拉伸）
        rect.set(
            splitLeft,
            bounds.height() - (h - splitBottom),
            bounds.width() - (w - splitRight),
            bounds.height()
        )
        canvas.drawBitmap(bitmap, Rect(splitLeft, splitBottom, splitRight, h), rect, paint)
        // 左边（垂直拉伸）
        rect.set(0, splitTop, splitLeft, bounds.height() - (h - splitBottom))
        canvas.drawBitmap(bitmap, Rect(0, splitTop, splitLeft, splitBottom), rect, paint)
        // 右边（垂直拉伸）
        rect.set(
            bounds.width() - (w - splitRight),
            splitTop,
            bounds.width(),
            bounds.height() - (h - splitBottom)
        )
        canvas.drawBitmap(bitmap, Rect(splitRight, splitTop, w, splitBottom), rect, paint)

        // 3. 绘制中间区域（双向拉伸）
        rect.set(
            splitLeft,
            splitTop,
            bounds.width() - (w - splitRight),
            bounds.height() - (h - splitBottom)
        )
        canvas.drawBitmap(bitmap, Rect(splitLeft, splitTop, splitRight, splitBottom), rect, paint)
    }

    override fun setAlpha(alpha: Int) {
        paint.alpha = alpha
        invalidateSelf()
    }

    override fun getOpacity(): Int = PixelFormat.TRANSLUCENT
    override fun getAlpha(): Int = paint.alpha
    override fun setColorFilter(colorFilter: ColorFilter?) {
        paint.colorFilter = colorFilter
        invalidateSelf()
    }
}