I want to implement a GridView which takes 3 items in a row, and if the number of items are 2 in last row, then the last row items should be aligned center instead of being left-aligned. Here are a couple of images to explain what I want to achieve.
Currently my implementation looks like
.
And this is what I want to achieve.
Any help would be appreciated.
There are many ways realizing the feature that you mentioned.
To summarize it, you need to inherit GridView and override MeasureOverride ArrangeOverride method to re-calculate each Rect of Panel's children. This way is complex. For more info you could refer to
XAML custom panels overview.
And you could also use PrepareContainerForItemOverride method to re-layout the item directly.
<local:VariableGrid
x:Name="MyGridView"
SelectionMode="Single"
IsSwipeEnabled="False">
<local:VariableGrid.ItemTemplate >
<DataTemplate>
<StackPanel BorderBrush="Red" BorderThickness="3" Height="200" Width="200" Margin="20">
</StackPanel>
</DataTemplate>
</local:VariableGrid.ItemTemplate>
<local:VariableGrid.ItemsPanel>
<ItemsPanelTemplate>
<VariableSizedWrapGrid
Orientation="Horizontal"
VerticalAlignment="Top"
ScrollViewer.HorizontalScrollMode="Enabled"
ScrollViewer.VerticalScrollMode="Disabled"
MaximumRowsOrColumns="4">
</VariableSizedWrapGrid>
</ItemsPanelTemplate>
</local:VariableGrid.ItemsPanel>
</local:VariableGrid>
VariableGrid.cs
public sealed class VariableGrid : GridView
{
public VariableGrid()
{
this.DefaultStyleKey = typeof(VariableGrid);
}
protected override void PrepareContainerForItemOverride(DependencyObject element, object item)
{
var list = this.ItemsSource as List<string>;
var griditem = element as GridViewItem;
for (var t = ((list.Count - list.Count % 4)); t < list.Count; t++)
{
if (item as string == list[t])
{
if (griditem != null)
{
VariableSizedWrapGrid.SetColumnSpan(griditem, 2);
}
}
}
base.PrepareContainerForItemOverride(element, item);
}
}
However, this simple way can not fit all the scenario.