private static YogaSize MeasureText(ReactTextShadowNode textNode, YogaNode node, float width,
YogaMeasureMode widthMode, float height, YogaMeasureMode heightMode)
{
Log.Info(ReactConstants.Tag, "MeasureText node=" + textNode.ReactTag);
// This is not a terribly efficient way of projecting the height of
// the text elements. It requires that we have access to the
// dispatcher in order to do measurement, which, for obvious
// reasons, can cause perceived performance issues as it will block
// the UI thread from handling other work.
//
// TODO: determine another way to measure text elements.
var task = DispatcherHelpers.CallOnDispatcher(() =>
{
if (textView == null)
{
textView = new ReactTextView(ReactProgram.RctWindow);
textView.LineWrapType = WrapType.Mixed;
}
var normalizedWidth = YogaConstants.IsUndefined(width) ? ReactProgram.RctWindow.ScreenSize.Width : width;
var normalizedHeight = YogaConstants.IsUndefined(height) ? ReactProgram.RctWindow.ScreenSize.Height : height;
textView.Resize((int)normalizedWidth, (int)normalizedHeight);
textView.Text = textNode._preparedSpannableText;
var textPartObject = textView.EdjeObject["elm.text"];
if (textPartObject == null)
{
throw new Exception("Invalid ReactTextView.EdjeObject[\"elm.text\"]");
}
Size size = textPartObject.TextBlockFormattedSize;
Log.Info(ReactConstants.Tag, "MeasureText result : width: " + size.Width + " height:" + size.Height);
//textView.Unrealize();
return(MeasureOutput.Make(
(float)size.Width,
(float)size.Height));
});
return(task.Result);
}
public void SetText(string text)
{
text = ReactTextView.filterText(text);
_text = text ?? "";
MarkUpdated();
}
/// <summary>
/// Should not be called, as this is a virtual view manager.
/// </summary>
/// <param name="root">Irrelevant.</param>
/// <param name="extraData">Irrelevant.</param>
public override void UpdateExtraData(ReactTextView root, object extraData)
{
}
