public static void UpdateLineBreakMode(this Button platformButton, ILineBreakMode button)
{
if (platformButton.GetContent <TextBlock>() is TextBlock textBlock)
{
textBlock?.UpdateLineBreakMode(button);
}
}
public static void UpdateLineBreakMode(this TextBlock platformControl, ILineBreakMode breakMode)
{
var lineBreakMode = breakMode.LineBreakMode;
var label = breakMode as ILabel;
switch (lineBreakMode)
{
case LineBreakMode.NoWrap:
platformControl.TextTrimming = TextTrimming.Clip;
platformControl.TextWrapping = TextWrapping.NoWrap;
break;
case LineBreakMode.WordWrap:
platformControl.TextTrimming = TextTrimming.None;
platformControl.TextWrapping = TextWrapping.Wrap;
break;
case LineBreakMode.CharacterWrap:
platformControl.TextTrimming = TextTrimming.WordEllipsis;
platformControl.TextWrapping = TextWrapping.Wrap;
break;
case LineBreakMode.HeadTruncation:
// TODO: This truncates at the end.
platformControl.TextTrimming = TextTrimming.WordEllipsis;
if (label != null)
{
platformControl.DetermineTruncatedTextWrapping(label);
}
break;
case LineBreakMode.TailTruncation:
platformControl.TextTrimming = TextTrimming.CharacterEllipsis;
if (label != null)
{
platformControl.DetermineTruncatedTextWrapping(label);
}
break;
case LineBreakMode.MiddleTruncation:
// TODO: This truncates at the end.
platformControl.TextTrimming = TextTrimming.WordEllipsis;
if (label != null)
{
platformControl.DetermineTruncatedTextWrapping(label);
}
break;
default:
throw new ArgumentOutOfRangeException();
}
}
public static void UpdateLineBreakMode(this UIButton nativeButton, ILineBreakMode button)
{
nativeButton.TitleLabel.LineBreakMode = button.LineBreakMode switch
{
LineBreakMode.NoWrap => UILineBreakMode.Clip,
LineBreakMode.WordWrap => UILineBreakMode.WordWrap,
LineBreakMode.CharacterWrap => UILineBreakMode.CharacterWrap,
LineBreakMode.HeadTruncation => UILineBreakMode.HeadTruncation,
LineBreakMode.TailTruncation => UILineBreakMode.TailTruncation,
LineBreakMode.MiddleTruncation => UILineBreakMode.MiddleTruncation,
_ => throw new ArgumentOutOfRangeException()
};
}
}
public static void UpdateLineBreakMode(this Button nativeControl, ILineBreakMode button)
{
nativeControl.SetLineBreakMode(button);
}
internal static void SetLineBreakMode(this TextView textView, ILineBreakMode breakMode, int?maxLines = null)
{
var lineBreakMode = breakMode.LineBreakMode;
if (breakMode is ILabel label)
{
maxLines = label.MaxLines;
}
if (!maxLines.HasValue || maxLines <= 0)
{
maxLines = int.MaxValue;
}
bool singleLine = false;
bool shouldSetSingleLine = !OperatingSystem.IsAndroidVersionAtLeast(23);
switch (lineBreakMode)
{
case LineBreakMode.NoWrap:
maxLines = 1;
textView.Ellipsize = null;
break;
case LineBreakMode.WordWrap:
textView.Ellipsize = null;
break;
case LineBreakMode.CharacterWrap:
textView.Ellipsize = null;
break;
case LineBreakMode.HeadTruncation:
maxLines = 1; // If maxLines is anything greater than 1, the truncation will be ignored: https://developer.android.com/reference/android/widget/TextView#setEllipsize(android.text.TextUtils.TruncateAt)
if (shouldSetSingleLine)
{
singleLine = true; // Workaround for bug in older Android API versions (https://issuetracker.google.com/issues/36950033) (https://bugzilla.xamarin.com/show_bug.cgi?id=49069)
}
textView.Ellipsize = TextUtils.TruncateAt.Start;
break;
case LineBreakMode.TailTruncation:
// Leaving this in for now to preserve existing behavior
// Technically, we don't _need_ this for Labels; they will handle Ellipsization at the end just fine, even with multiple lines
// But we don't have a mechanism for setting MaxLines on other controls (e.g., Button) right now, so we need to force it here or
// they will potentially exceed a single line. Also, changing this behavior the for Labels would technically be breaking (though
// possibly less surprising than what happens currently).
maxLines = 1;
textView.Ellipsize = TextUtils.TruncateAt.End;
break;
case LineBreakMode.MiddleTruncation:
maxLines = 1; // If maxLines is anything greater than 1, the truncation will be ignored: https://developer.android.com/reference/android/widget/TextView#setEllipsize(android.text.TextUtils.TruncateAt)
textView.Ellipsize = TextUtils.TruncateAt.Middle;
break;
}
if (shouldSetSingleLine) // Save ourselves this trip across the bridge if we're on an API level that doesn't need it
{
textView.SetSingleLine(singleLine);
}
textView.SetMaxLines(maxLines.Value);
}
