public void OnLayout(bool changed, int left, int top, int right, int bottom)
{
if (_disposed || _renderer == null || _element == null)
{
return;
}
AButton view = View;
if (view == null)
{
return;
}
Drawable drawable = null;
Drawable[] drawables = TextViewCompat.GetCompoundDrawablesRelative(view);
if (drawables != null)
{
foreach (var compoundDrawable in drawables)
{
if (compoundDrawable != null)
{
drawable = compoundDrawable;
break;
}
}
}
if (drawable != null)
{
int iconWidth = drawable.IntrinsicWidth;
drawable.CopyBounds(_drawableBounds);
// Center the drawable in the button if there is no text.
// We do not need to undo this as when we get some text, the drawable recreated
if (string.IsNullOrEmpty(_element.Text))
{
var newLeft = (right - left - iconWidth) / 2 - view.PaddingLeft;
_drawableBounds.Set(newLeft, _drawableBounds.Top, newLeft + iconWidth, _drawableBounds.Bottom);
drawable.Bounds = _drawableBounds;
}
else
{
if (_alignIconWithText && _element.ContentLayout.IsHorizontal())
{
var buttonText = view.TextFormatted;
// if text is transformed, add that transformation to to ensure correct calculation of icon padding
if (view.TransformationMethod != null)
{
buttonText = view.TransformationMethod.GetTransformationFormatted(buttonText, view);
}
var measuredTextWidth = view.Paint.MeasureText(buttonText, 0, buttonText.Length());
var textWidth = Math.Min((int)measuredTextWidth, view.Layout.Width);
var contentsWidth = ViewCompat.GetPaddingStart(view) + iconWidth + view.CompoundDrawablePadding + textWidth + ViewCompat.GetPaddingEnd(view);
var newLeft = (view.MeasuredWidth - contentsWidth) / 2;
if (_element.ContentLayout.Position == Button.ButtonContentLayout.ImagePosition.Right)
{
newLeft = -newLeft;
}
if (ViewCompat.GetLayoutDirection(view) == ViewCompat.LayoutDirectionRtl)
{
newLeft = -newLeft;
}
_drawableBounds.Set(newLeft, _drawableBounds.Top, newLeft + iconWidth, _drawableBounds.Bottom);
drawable.Bounds = _drawableBounds;
}
}
}
_hasLayoutOccurred = true;
}