Day23 - 调整悬浮视窗大小

今天来做调整视窗大小的功能。

因为今天比较累，我内容会写比较少。

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中的移动视窗差不多的内容，把其他按钮的状态设一设。leftTopPoint、leftBotPoint、rightTopPoint、rightBotPoint是我分别在Layout四个角落放上的圆点ImageView，最後一节的目前画面能看到。另外开始调整大小时要注意把updateRunnable给取消掉，否则可能会和RecyclerView的画面更新冲突导致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
}

基本上内容也和Day22中移动视窗的部分大同小异，唯一的差别是在移动画面的同时去修改画面的大小。当然目前这部分的效果还是很粗糙，可能等後续其他功能都做得差不多再来调整了。