WrapPanel: Trying to make the ItemWidth equal to the max width of any one element

Question

Hopefully no one else has already asked this question, but I have searched and cannot find any mention. Feel free to point me in the right direction if I missed another que

Answer 1

Try the following. The part to pay attention to is the Grid.IsSharedSizeScope="True" on the wrap panel AND the column definition's SharedSizeGroup property.

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <WrapPanel Grid.IsSharedSizeScope="True">
            <WrapPanel.Resources>
                <Style TargetType="TextBlock">
                    <Setter Property="Padding" Value="2" />
                    <Setter Property="HorizontalAlignment" Value="Center" />
                </Style>
            </WrapPanel.Resources>
            <WrapPanel.Children>
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition SharedSizeGroup="group1" />
                    </Grid.ColumnDefinitions>
                    <TextBlock Text="abcdefghijklmnopqrstuvwxyz" />
                </Grid>
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition SharedSizeGroup="group1" />
                    </Grid.ColumnDefinitions>
                    <TextBlock Text="1234567890" />
                </Grid>
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition SharedSizeGroup="group1" />
                    </Grid.ColumnDefinitions>
                    <TextBlock Text="abcdefghijklmnopqrstuvwxyz" />
                </Grid>
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition SharedSizeGroup="group1" />
                    </Grid.ColumnDefinitions>
                    <TextBlock Text="1234567890" />
                </Grid>
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition SharedSizeGroup="group1" />
                    </Grid.ColumnDefinitions>
                    <TextBlock Text="abcdefghijklmnopqrstuvwxyz" />
                </Grid>
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition SharedSizeGroup="group1" />
                    </Grid.ColumnDefinitions>
                    <TextBlock Text="1234567890" />
                </Grid>
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition SharedSizeGroup="group1" />
                    </Grid.ColumnDefinitions>
                    <TextBlock Text="abcdefghijklmnopqrstuvwxyz" />
                </Grid>
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition SharedSizeGroup="group1" />
                    </Grid.ColumnDefinitions>
                    <TextBlock Text="1234567890" />
                </Grid>
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition SharedSizeGroup="group1" />
                    </Grid.ColumnDefinitions>
                    <TextBlock Text="abcdefghijklmnopqrstuvwxyz" />
                </Grid>
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition SharedSizeGroup="group1" />
                    </Grid.ColumnDefinitions>
                    <TextBlock Text="1234567890" />
                </Grid>
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition SharedSizeGroup="group1" />
                    </Grid.ColumnDefinitions>
                    <TextBlock Text="abcdefghijklmnopqrstuvwxyz" />
                </Grid>
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition SharedSizeGroup="group1" />
                    </Grid.ColumnDefinitions>
                    <TextBlock Text="1234567890" />
                </Grid>
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition SharedSizeGroup="group1" />
                    </Grid.ColumnDefinitions>
                    <TextBlock Text="abcdefghijklmnopqrstuvwxyz" />
                </Grid>
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition SharedSizeGroup="group1" />
                    </Grid.ColumnDefinitions>
                    <TextBlock Text="1234567890" />
                </Grid>
            </WrapPanel.Children>
        </WrapPanel>
    </Grid>
</Window>

Answer 2

You could wrap each item in a Grid, and use the Grid's ShareSizeScope property to make sure all items share the same width.

For example, on your WrapPanel you would set Grid.IsSharedSizeScope to true

<WrapPanel Grid.IsSharedSizeScope="True">

Then you'd wrap each item in a single cell Grid that uses the SharedSizeGroup property to tell them that they all share a size

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition SharedSizeGroup="SharedGroup" />
    </Grid.ColumnDefinitions>
    <ContentPresenter />
</Grid>

If you want an example, a quick Google search gave me this answer which contains a code example.

I'd recommend performance testing this too if you have a large set of data.

Answer 3

try setting the itemwidth property to Auto... see here:

http://msdn.microsoft.com/en-us/library/system.windows.controls.wrappanel.itemwidth(v=vs.110).aspx

to perform this "width set" programmatically, you could do the following, once the control has been rendered.

protected override void OnRender(DrawingContext dc)
{

int largest = 0;
foreach(UIElement child in this.myWrapPanel.Children)
{
    if(child.Width>largest)
        largest = child.Width;
}

this.myWrapPanel.ItemWidth = largest;


}