Question

在本课程中，我为 Tic-Tae-Toe 绘制了简单的基础。它由截取的行和＆＃34; X＆＃34;在牢房的中心。因此，当用户触摸单元格时，应该更改其中的textColor。

我使用invalidate(rect)重绘具体单元格，但在这种情况下，每个单元格都会更改它textColor。

根据 Romain Guy 字样，canvas全视图Rect来了用于绘图。 DisplayList会在绘图命令和脏 Rect之间找到拦截，并且只会绘制这些命令。但似乎它并没有这么做。 Partial invalidation in custom Android view with hardware acceleration

此外，我发现在 4.4 - 5.0 Android之间发生了奇怪的代码更改。所以你可以看到mCurrentDirty从代码中消失了。 Android View.invalidate(Rect) different behavior between two devices

SA的P.S 此逻辑正常工作，只更改了脏Rect。

package com.eugeneshapovalov.fizmigclient

import android.content.Context
import android.graphics.Canvas
import android.graphics.Color
import android.graphics.Paint
import android.graphics.Rect
import android.util.AttributeSet
import android.view.MotionEvent
import android.view.View
import timber.log.Timber

class TicTacToeView : View, View.OnTouchListener {

    constructor(context: Context) : this(context, null)
    constructor(context: Context, attrs: AttributeSet?) : this(context, attrs, 0)
    constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(context, attrs, defStyleAttr)

    companion object {
        const val CELL_SIZE_RATIO = 1 / 3f
        const val LINE_SIZE = 2f
        const val CELL_COUNT = 3
    }

    val linePaint = Paint()
    val textPaint = Paint()
    val dirtyCell = Rect()
    var colorNumber: Int

    init {
        setOnTouchListener(this)

        colorNumber = 0
        linePaint.strokeWidth = resources.displayMetrics.density * LINE_SIZE
        textPaint.textSize = 60f
    }

    private lateinit var cells: Array<Array<Rect>>

    override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
        super.onSizeChanged(w, h, oldw, oldh)

        initCells()
    }

    private fun initCells() {
        cells = Array(CELL_COUNT, { Array(CELL_COUNT, { Rect() }) })
        val xCell = (width * CELL_SIZE_RATIO).toInt()
        val yCell = (height * CELL_SIZE_RATIO).toInt()

        for (i in 0 until CELL_COUNT) {
            for (j in 0 until CELL_COUNT) {
                cells[i][j].left = (x + j * xCell).toInt()
                cells[i][j].top = (y + i * yCell).toInt()
                cells[i][j].right = (x + (j + 1) * xCell).toInt()
                cells[i][j].bottom = (y + (i + 1) * yCell).toInt()
            }
        }
    }

    override fun onDraw(canvas: Canvas) {
        super.onDraw(canvas)

        drawLines(canvas)
        drawText(canvas)
    }

    private fun drawLines(canvas: Canvas) {
        // Vertical lines
        canvas.drawLine(x + width * CELL_SIZE_RATIO, y, x + width * CELL_SIZE_RATIO, y + height, linePaint)
        canvas.drawLine(x + width * 2 * CELL_SIZE_RATIO, y, x + width * 2 * CELL_SIZE_RATIO, y + height, linePaint)
        // Horizontal lines
        canvas.drawLine(x, y + height * CELL_SIZE_RATIO, x + width, y + height * CELL_SIZE_RATIO, linePaint)
        canvas.drawLine(x, y + height * 2 * CELL_SIZE_RATIO, x + width, y + height * 2 * CELL_SIZE_RATIO, linePaint)
    }

    private fun drawText(canvas: Canvas) {
        textPaint.color = when (colorNumber % 5) {
            0 -> Color.BLACK
            1 -> Color.BLUE
            2 -> Color.RED
            3 -> Color.GRAY
            4 -> Color.YELLOW
            else -> Color.GREEN
        }

        for (i in 0 until CELL_COUNT) {
            for (j in 0 until CELL_COUNT) {
                val rect = cells[i][j]
                canvas.drawText("X", rect.exactCenterX(), rect.exactCenterY(), textPaint)
            }
        }
    }

    override fun onTouch(v: View?, event: MotionEvent?): Boolean {
        when (event?.action) {
            MotionEvent.ACTION_UP -> {
                for (i in 0 until CELL_COUNT) {
                    for (j in 0 until CELL_COUNT) {
                        val rect = cells[i][j]
                        if (rect.contains(event.x.toInt(), event.y.toInt())) {
                            colorNumber += (j + 7)
                            Timber.d("Rect: ${rect.flattenToString()}")
                            invalidate(rect)
                        }
                    }
                }
            }
        }
        return true
    }
}

使用硬件加速

0 个答案: