To build an Entry in .NET MAUI that scales its height relative to the font size, you can use a combination of a custom ContentView and the OnSizeAllocated method. Here's a step-by-step guide on how to achieve this:
Create a new .NET MAUI project or use an existing one.
Add a new class for the custom Entry. Let's call it ScalingEntry. This class will inherit from ContentView.
In the ScalingEntry class, define a private Entry field that will handle the text input.
Override the OnSizeAllocated method in the ScalingEntry class. This method is called whenever the size of the ScalingEntry changes.
In the OnSizeAllocated method, update the font size of the internal Entry based on the height of the ScalingEntry.
Here's the code for the ScalingEntry class:
using Microsoft.Maui.Controls;
namespace YourNamespace
{
public class ScalingEntry : ContentView
{
private Entry entry;
public ScalingEntry()
{
// Create the internal Entry
entry = new Entry();
// Bind the Text property to the internal Entry
entry.SetBinding(Entry.TextProperty, new Binding(nameof(Text), source: this));
// Add the internal Entry to the ContentView's content
Content = entry;
}
public static readonly BindableProperty TextProperty =
BindableProperty.Create(nameof(Text), typeof(string), typeof(ScalingEntry), default(string));
public string Text
{
get => (string)GetValue(TextProperty);
set => SetValue(TextProperty, value);
}
protected override void OnSizeAllocated(double width, double height)
{
base.OnSizeAllocated(width, height);
// Calculate the desired font size based on the height of the ScalingEntry
double fontSize = height * 0.6; // Adjust this multiplier as needed for your specific design
// Set the font size of the internal Entry
entry.FontSize = fontSize;
}
}
}
Now, you can use the ScalingEntry in your XAML code just like a regular Entry, and its height will adjust based on the font size:
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:YourNamespace">
<StackLayout>
<!-- Use the ScalingEntry just like a regular Entry -->
<local:ScalingEntry Text="This is a scaling Entry" />
</StackLayout>
</ContentPage>
Adjust the 0.6 multiplier in the OnSizeAllocated method as needed to fine-tune the scaling based on your design preferences. This value will vary depending on the font and how much padding you want around the text.