void UpdateImage()
{
if (_disposed || _renderer == null || _element == null)
{
return;
}
AButton view = View;
if (view == null)
{
return;
}
ImageSource elementImage = _element.ImageSource;
if (elementImage == null || elementImage.IsEmpty)
{
view.SetCompoundDrawablesWithIntrinsicBounds(null, null, null, null);
return;
}
// No text, so no need for relative position; just center the image
// There's no option for just plain-old centering, so we'll use Top
// (which handles the horizontal centering) and some tricksy padding (in OnLayout)
// to handle the vertical centering
var layout = string.IsNullOrEmpty(_element.Text) ? _imageOnlyLayout : _element.ContentLayout;
if (_maintainLegacyMeasurements)
{
view.CompoundDrawablePadding = (int)layout.Spacing;
}
else
{
view.CompoundDrawablePadding = (int)Context.ToPixels(layout.Spacing);
}
Drawable existingImage = null;
var images = TextViewCompat.GetCompoundDrawablesRelative(view);
for (int i = 0; i < images.Length; i++)
{
if (images[i] != null)
{
existingImage = images[i];
break;
}
}
if (_renderer is IVisualElementRenderer visualElementRenderer)
{
visualElementRenderer.ApplyDrawableAsync(Button.ImageSourceProperty, Context, image =>
{
if (image == existingImage)
{
return;
}
switch (layout.Position)
{
case Button.ButtonContentLayout.ImagePosition.Top:
TextViewCompat.SetCompoundDrawablesRelativeWithIntrinsicBounds(view, null, image, null, null);
break;
case Button.ButtonContentLayout.ImagePosition.Right:
TextViewCompat.SetCompoundDrawablesRelativeWithIntrinsicBounds(view, null, null, image, null);
break;
case Button.ButtonContentLayout.ImagePosition.Bottom:
TextViewCompat.SetCompoundDrawablesRelativeWithIntrinsicBounds(view, null, null, null, image);
break;
default:
// Defaults to image on the left
TextViewCompat.SetCompoundDrawablesRelativeWithIntrinsicBounds(view, image, null, null, null);
break;
}
if (_hasLayoutOccurred)
{
_element?.InvalidateMeasureNonVirtual(InvalidationTrigger.MeasureChanged);
}
});
}
}