avalonia docs

Grid

The Grid control is a Panel control useful for organizing other controls in columns and rows. ColumnDefinition and RowDefinition properties are used to define absolute, relative, or proportional row and column geometries for the grid. Each control in the grid will be placed using the Grid.Column and Grid.Row additional properties. It is also possible to have controls that span multiple rows and/or columns by using the ColumnSpan and RowSpan properties.

Reference

Grid

Source code

Grid.cs

Examples

Grid Using Properties and Spanning Columns

Below is an example that shows:

<Grid ColumnDefinitions="100,1.5*,4*" RowDefinitions="Auto,Auto,Auto"  Margin="4">
  <TextBlock Text="Col0Row0:" Grid.Row="0" Grid.Column="0"/>
  <TextBlock Text="Col0Row1:" Grid.Row="1" Grid.Column="0"/>
  <TextBlock Text="Col0Row2:" Grid.Row="2" Grid.Column="0"/>
  <CheckBox Content="Col2Row0" Grid.Row="0" Grid.Column="2"/>
  <Button Content="SpansCol1-2Row1-2" Grid.Row="1" Grid.Column="1" Grid.RowSpan="2" Grid.ColumnSpan="2"/>
</Grid>

In the above example the "Auto" keyword is used to have the row or column geometry be determined by the containing control's definitions. The asterisk is used for denoting proportional spacing. The multiplier used in front of the proportional spacing value is used to figure out the relative size for the proportional columns. All proportional columns fit in the space left behind after all explicit values and "Auto" values are calculated. So for the above example the Column 1 will get 1.5 parts plus Column 2 will get 4 parts of the remainder of the space that Colum 0 left. Lastly, the Button itself will fill in from the initial Cell 1,1 over one column and down one row because Grid.RowSpan and Grid.ColumnSpan are set to occupy two units instead of one.

Grid Using Properties and Spanning Columns

Using Verbose Row/Column Definitions

For more complex row and column definitions it's possible to explicitly use Grid.ColumnDefinitions and Grid.RowDefinitions XAML fields to provide access to these additional settings. The below code produces is exactly the same except for the fact we set the minimum width on the second column to be 300.

<Grid Margin="4">
  <Grid.ColumnDefinitions>
    <ColumnDefinition Width="100" />
    <ColumnDefinition Width="1.5*" MinWidth="300"/>
    <ColumnDefinition Width="4*"/>
  </Grid.ColumnDefinitions>
  <Grid.RowDefinitions>
    <RowDefinition Height="Auto"/>
    <RowDefinition Height="Auto"/>
    <RowDefinition Height="Auto"/>
  </Grid.RowDefinitions>
  <TextBlock Text="Col0Row0:" Grid.Row="0" Grid.Column="0"/>
  <TextBlock Text="Col0Row1:" Grid.Row="1" Grid.Column="0"/>
  <TextBlock Text="Col0Row2:" Grid.Row="2" Grid.Column="0"/>
  <CheckBox Content="Col2Row0" Grid.Row="0" Grid.Column="2"/>
  <Button Content="SpansCol1-2Row1-2" Grid.Row="1" Grid.Column="1" Grid.RowSpan="2" Grid.ColumnSpan="2"/>
</Grid>

Using Verbose Row/Column Definitions

Common Properties

Property Description
ColumnDefinitions A collection of ColumnDefinitions describing the width and max or min width of a column
RowDefinitions A collection of RowDefinitions describing the height and max or min height of a row
Grid.Column Attached property to assign a control into a zero based column
Grid.Row Attached property to assign a control into a zero based row
Grid.ColumnSpan Attached property to define the number of columns a control will span
Grid.RowSpan Attached property to define the number of rows a control will span