Android clipRect无法按预期裁剪 [英] Android clipRect not clipping as expected

问题描述

我想在碰到图标时截断字符串.

I would like to clip the string when it hits the icon.

这意味着该字符串在命中 iconSize + iconMargin 时将被剪切.

This would mean that the string would be clipped when it hit iconSize + iconMargin.

这是我在 onDraw 中拥有的代码，该代码正是这样做的:

This is the code I have in onDraw, which does that exactly:

canvas.save()
canvas.clipRect((itemIconSize + itemIconMargin).toInt(), 0, 0, 0)
canvas.drawText(
      item.title,
      item.rect.centerX() - (itemIconSize / 2 + itemIconMargin),
      item.rect.centerY() - textHeight, paintText
)
canvas.restore()

问题在于该字符串不会被剪切，其行为类似于上图所示.

The problem is that the string doesn't clip and behaves like it is displayed in the image above.

当字符串打到图标时，如何截断字符串?

How can I clip the string when it hits the icon?

推荐答案

canvas.clipRect 采用四个参数作为输入，以画布坐标表示矩形.

canvas.clipRect takes four parameter as input to represent a rectangle in canvas coordinates.

• left =矩形左上角的X坐标
• top =矩形上角的Y坐标
• right =矩形右上角的X坐标
• bottom =矩形下角的Y坐标

您的示例中的rect的顶部和底部角Y坐标为0，这将导致一个高度为0的矩形.因此，将您的代码更改为以下内容:

The rect in your example has 0 as top and bottom corner Y coordinate and this results in a rectangle with 0 height. So change your code to something like this:

canvas.clipRect((itemIconSize + itemIconMargin).toInt() //left: right side of icon
, 0 // top: top point of the view
, view.width // right: end of the View
, view.height // bottom: bottom of the View
)

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