今天來做調整視窗大小的功能。

因為今天比較累，我內容會寫比較少。

OnClickListener

binding.resize.setOnClickListener {
    if (it.isSelected) {
        binding.touchPoint.visibility = View.GONE
        binding.leftTopPoint.setOnTouchListener(null)
        binding.leftBotPoint.setOnTouchListener(null)
        binding.rightTopPoint.setOnTouchListener(null)
        binding.rightBotPoint.setOnTouchListener(null)
        updateHandler.post(updateRunnable)
    } else {
        updateHandler.removeCallbacks(updateRunnable)
        binding.touchPoint.visibility = View.VISIBLE
        binding.leftTopPoint.setOnTouchListener(onFrameResizeListener)
        binding.leftBotPoint.setOnTouchListener(onFrameResizeListener)
        binding.rightTopPoint.setOnTouchListener(onFrameResizeListener)
        binding.rightBotPoint.setOnTouchListener(onFrameResizeListener)
    }
    binding.recyclerView.touchable = it.isSelected
    binding.move.isClickable = it.isSelected
    binding.close.isClickable = it.isSelected
    binding.back.isClickable = it.isSelected
    it.isSelected = !it.isSelected
}

跟Day22中的移動視窗差不多的內容，把其他按鈕的狀態設一設。leftTopPoint、leftBotPoint、rightTopPoint、rightBotPoint是我分別在Layout四個角落放上的圓點ImageView，最後一節的目前畫面能看到。另外開始調整大小時要注意把updateRunnable給取消掉，否則可能會和RecyclerView的畫面更新衝突導致Crash。

onFrameResizeListener

private val onFrameResizeListener = View.OnTouchListener { v, motionEvent ->
    val params = binding.root.layoutParams as WindowManager.LayoutParams
    when (motionEvent.action) {
        MotionEvent.ACTION_DOWN -> {
            return@OnTouchListener true
        }
        MotionEvent.ACTION_MOVE -> {
            if (motionEvent.historySize < 2) return@OnTouchListener true
            var dx = motionEvent.getHistoricalX(1) - motionEvent.getHistoricalX(0)
            var dy = motionEvent.getHistoricalY(1) - motionEvent.getHistoricalY(0)
            params.x = (params.x + dx).toInt()
            params.y = (params.y + dy).toInt()

            when (v) {
                binding.leftTopPoint -> {
                    dx = -dx
                    dy = -dy
                }
                binding.leftBotPoint -> {
                    dx = -dx
                }
                binding.rightTopPoint -> {
                    dy = -dy
                }
            }
            params.width = (params.width + dx).toInt()
            params.height = (params.height + dy).toInt()

            windowManager.updateViewLayout(binding.root, params)
            return@OnTouchListener true
        }
    }

    return@OnTouchListener false
}

基本上內容也和Day22中移動視窗的部分大同小異，唯一的差別是在移動畫面的同時去修改畫面的大小。當然目前這部分的效果還是很粗糙，可能等後續其他功能都做得差不多再來調整了。

目前畫面