XAML ColumnDefinition中的*(星号)是什么意思? [英] What's the meaning of * (asterisk) in XAML ColumnDefinition?

问题描述

下面的XAML中的*(星号)是什么意思?

What is the meaning of * (asterisk) in the XAML below?

<ColumnDefinition Width="0.07*"/>
<Grid Height="100" HorizontalAlignment="Left" 
      Margin="102,134,0,0" 
      Name="grid1" VerticalAlignment="Top" 
      Width="354">
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="40*" />
        <ColumnDefinition Width="314*" />
    </Grid.ColumnDefinitions>
</Grid>

推荐答案

在WPF网格中定义列时，可以将宽度设置为三个可能值之一:

When you define a column in a WPF grid you can set the width to one of three possible values:

• 固定宽度
• Auto –列将变得足够宽以适合其子级，或者
• *(星号)会占用所有可用的剩余空间

• A fixed width,
• Auto – column will become as wide as necessary to fit its children, or
• * (star) take up any available remaining space

*以数字为前缀(如果未指定数字，则默认为1).可用空间与前缀数字成比例地分配在加星标的列中.

The * is prefixed by a number (default is 1 if no number is specified). The available space is divided among the starred columns in proportion to the prefix number.

如果您有这个定义

<Grid.ColumnDefinitions>
  <ColumnDefinition Width="0.07*"/>
  <ColumnDefinition Width="0.93*"/>
</Grid.ColumnDefinitions>

第一列将获得可用总空间的7％，第二列将获得93％的可用空间.另一方面，如果您具有以下定义:

The first column will get 7% of the total space available and the second column would get 93%. On the other hand if you had this definition:

<Grid.ColumnDefinitions>
  <ColumnDefinition Width="0.07*"/>
  <ColumnDefinition Width="0.14*"/>
</Grid.ColumnDefinitions>

第一列将获得可用空间的1/3，第二个将是可用空间的2/3.

The first column would get 1/3 and the second 2/3 of the available space.

在特定情况下，网格的宽度为354，两列的比例分别为40和314，您将获得以下列宽:

In your specific case where the width of the grid is 354 and the proportions of the two columns are 40 and 314 you get the following column widths:

First column width = 40/(40 + 314)*354 = 40
Second coulmn width = 314/(40 + 314)*354 = 314

当栅格的宽度不固定时，最好使用星形宽度.调整网格大小后，列将按星形宽度指定的比例缩放.在您的情况下，网格的宽度是固定的，您可以很容易地使用固定宽度的列.

The star width is best used when the width of the grid isn't fixed. When the grid is resized the columns will then scale proportionally as specified by the star widths. In your case the width of the grid is fixed and you could just as easily have used fixed width columns.

如果您想要一种布局，其中第二列是第一列宽度的两倍，而第三列是第一列宽度的三倍，则需要以下定义:

If you want a layout where the second column is double the width of the first and the third column is triple the width of the first you need this definition:

<Grid.ColumnDefinitions>
  <ColumnDefinition Width="*"/>
  <ColumnDefinition Width="2*"/>
  <ColumnDefinition Width="3*"/>
</Grid.ColumnDefinitions>

如果网格的总宽度为300，则列宽为50、100和150.如果网格的总宽度为600，则列宽为100、200和300.依此类推.

If the total width of the grid is 300 you get column widths 50, 100 and 150. If the total width of the grid is 600 you get column widths 100, 200 and 300. And so on.

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