public override SizeRequest GetDesiredSize(double widthConstraint, double heightConstraint)
{
if (Control is TextBlock control)
{
_fontMetrics = control.GetFontMetrics();
var desiredSize = InternalMeasure(new Windows.Foundation.Size(widthConstraint, heightConstraint));
var minSize = new Xamarin.Forms.Size(10, Element != null ? _fontMetrics.LineHeightForFontSize(Element.DecipheredMinFontSize()) : 10);
var result = new SizeRequest(new Xamarin.Forms.Size(desiredSize.Width, desiredSize.Height), minSize);
return(result);
}
return(new SizeRequest(Size.Zero));
}
protected Windows.Foundation.Size InternalMeasure(Windows.Foundation.Size availableSize, TextBlock control = null)
{
if (Element is Forms9Patch.Label element)
{
control = control ?? Control;
if (control == null || availableSize.Width <= 0 || availableSize.Height <= 0)
{
_lastAvailableSize = availableSize;
_lastElementSize = element.Bounds.Size;
return(new Windows.Foundation.Size(0, 0));
}
// Next block was commented out because of failure to render BcNotes in Heights and Areas (in notes popup and on Disclaimer)
// ... and, by doing so, it broke the picker and the keypad in Heights and Areas.
if (LayoutValid &&
control == Control &&
_lastAvailableSize.Width == availableSize.Width &&
_lastAvailableSize.Height == availableSize.Height &&
_lastElementSize == element.Bounds.Size &&
DateTime.Now - _lastMeasure < TimeSpan.FromSeconds(1))
{
return(_lastInternalMeasure);
}
element.SetIsInNativeLayout(true);
var width = Math.Min(availableSize.Width, int.MaxValue / 2);
var height = Math.Min(availableSize.Height, int.MaxValue / 2);
var result = new Windows.Foundation.Size(width, height);
if (control != null)
{
// reset FontSize
var tmpFontSize = element.DecipheredFontSize();
if (element.SynchronizedFontSize > element.MinFontSize)
{
tmpFontSize = element.SynchronizedFontSize;
}
var minFontSize = element.DecipheredMinFontSize();
control.MaxLines = 0; // int.MaxValue / 3;
control.MaxWidth = double.PositiveInfinity;
control.MaxHeight = double.PositiveInfinity;
control.MinHeight = 0;
control.MinWidth = 0;
control.FontStyle = element.FontAttributes.HasFlag(FontAttributes.Italic) ? FontStyle.Italic : FontStyle.Normal;
control.FontWeight = element.FontAttributes.HasFlag(FontAttributes.Bold) ? FontWeights.Bold : FontWeights.Normal;
control.UpdateLineBreakMode(element);
control.SetAndFormatText(element, tmpFontSize);
control.Measure(new Windows.Foundation.Size(width, double.PositiveInfinity));
double tmpHt = control.DesiredSize.Height;
_fontMetrics = control.GetFontMetrics();
if (element.Lines == 0)
{
// do our best job to fit the existing space.
if (control.DesiredSize.Width - width > -Precision || control.DesiredSize.Height - height > -Precision)
{
if (DebugCondition)
{
System.Diagnostics.Debug.WriteLine(GetType() + ".");
}
tmpFontSize = ZeroLinesFit(element, control, minFontSize, tmpFontSize, width, height);
if (DebugCondition)
{
System.Diagnostics.Debug.WriteLine(GetType() + ".");
}
control.SetAndFormatText(element, tmpFontSize);
control.Measure(new Windows.Foundation.Size(width, double.PositiveInfinity));
tmpHt = control.DesiredSize.Height;
}
}
else if (element.AutoFit == AutoFit.Lines)
{
tmpHt = height;
if (height > int.MaxValue / 3)
{
tmpHt = height = _fontMetrics.HeightForLinesAtFontSize(element.Lines, tmpFontSize);
}
else
{
// set the font size to fit Label.Lines into the available height
var constrainedSize = control.DesiredSize;
tmpFontSize = _fontMetrics.FontSizeFromLinesInHeight(element.Lines, tmpHt);
tmpFontSize = FontExtensions.ClipFontSize(tmpFontSize, element);
control.SetAndFormatText(element, tmpFontSize);
control.Measure(new Windows.Foundation.Size(double.PositiveInfinity, double.PositiveInfinity));
if (element.Lines > 1)
{
var unconstrainedSize = control.DesiredSize;
if (unconstrainedSize.Width > constrainedSize.Width)
{
control.SetAndFormatText(element, tmpFontSize);
control.Measure(new Windows.Foundation.Size(width, double.PositiveInfinity));
}
}
}
}
else if (element.AutoFit == AutoFit.Width)
{
if (control.ActualWidth > control.DesiredSize.Width || control.DesiredSize.Height / control.LineHeight > element.Lines)
{
tmpFontSize = WidthAndLinesFit(element, control, element.Lines + 1, minFontSize, tmpFontSize, width);
control.SetAndFormatText(element, tmpFontSize);
control.Measure(new Windows.Foundation.Size(width, double.PositiveInfinity));
tmpHt = control.DesiredSize.Height;
}
}
// none of these should happen so let's keep an eye out for it to be sure everything upstream is working
if (tmpFontSize > element.DecipheredFontSize())
{
throw new Exception("fitting somehow returned a tmpFontSize > label.FontSize");
}
if (tmpFontSize < element.DecipheredMinFontSize())
{
throw new Exception("fitting somehow returned a tmpFontSize < label.MinFontSize");
}
// the following doesn't apply when where growing
//if (tmpFontSize > label.DecipheredMinFontSize() && (control.DesiredSize.Width > Math.Ceiling(w) || control.DesiredSize.Height > Math.Ceiling(Math.Max(availableSize.Height, label.Height))) )
// throw new Exception("We should never exceed the available bounds if the FontSize is greater than label.MinFontSize");
// we needed the following in Android as well. Xamarin layout really doesn't like this to be changed in real time.
if (element != null && Control == control) // multipicker test was getting here with element and Control both null
{
if (tmpFontSize == element.FontSize || (element.FontSize == -1 && tmpFontSize == FontExtensions.DefaultFontSize()))
{
element.FittedFontSize = -1;
}
else if (Math.Abs(element.FittedFontSize - tmpFontSize) > 1)
{
element.FittedFontSize = tmpFontSize;
}
}
result = new Windows.Foundation.Size(Math.Ceiling(control.DesiredSize.Width), Math.Ceiling(tmpHt));
control.MaxLines = element.Lines;
}
element.SetIsInNativeLayout(false);
if (control == Control)
{
LayoutValid = true;
_lastAvailableSize = availableSize;
_lastElementSize = element.Bounds.Size;
//_lastAutoFit = label.AutoFit;
//_lastLines = label.Lines;
_lastMeasure = DateTime.Now;
_lastInternalMeasure = result;
PrivateArrange(availableSize);
}
return(result);
}
return(Windows.Foundation.Size.Empty);
}
protected override Windows.Foundation.Size MeasureOverride(Windows.Foundation.Size availableSize)
{
if (DebugCondition)
{
System.Diagnostics.Debug.WriteLine("");
}
var label = Element;
var textBlock = Control;
DebugMessage("[" + _measureOverrideInvocation + "] MeasureOverride pre-Enter availableSize=[" + availableSize + "] ElemmentSize=[" + Element.Bounds.Size + "] PageSize=[" + Xamarin.Forms.Application.Current.MainPage.Bounds.Size + "]");
DebugMessage("[" + _measureOverrideInvocation + "] \t\t availWidth>=Page.Width=[" + (Math.Round(availableSize.Width) >= Math.Round(Xamarin.Forms.Application.Current.MainPage.Width)) + "]");
DebugMessage("[" + _measureOverrideInvocation + "] \t\t availHeight>=Page.Height=[" + (Math.Round(availableSize.Height) >= Math.Round(Xamarin.Forms.Application.Current.MainPage.Height)) + "]");
DebugMessage("[" + _measureOverrideInvocation + "] \t\t Element.Parent=[" + Element.Parent + "]");
DebugMessage("[" + _measureOverrideInvocation + "] \t\t MeasureOverride FontSize=[" + textBlock.FontSize + "] BaseLineOffset=[" + textBlock.BaselineOffset + "] LineHeight=[" + textBlock.LineHeight + "]");
if (DebugCondition)
{
System.Diagnostics.Debug.WriteLine("");
}
if (label == null || textBlock == null || availableSize.Width == 0 || availableSize.Height == 0)
{
return(new Windows.Foundation.Size(0, 0));
}
//if (Double.IsInfinity(availableSize.Height) && Double.IsInfinity(availableSize.Width))
// LayoutValid = false;
if (LayoutValid && _lastAvailableSize.Width <= availableSize.Width && _lastAvailableSize.Height <= availableSize.Height && _lastElementSize == Element.Bounds.Size && DateTime.Now - _lastMeasure < TimeSpan.FromSeconds(1))
{
return(_lastMeasureOverrideResult);
}
//_lastAvailableSize = availableSize;
if (DebugCondition)
{
System.Diagnostics.Debug.WriteLine("");
}
DebugMessage("[" + _measureOverrideInvocation + "] MeasureOverride ENTER availableSize=[" + availableSize + "]");
//Element.IsInNativeLayout = true;
label.SetIsInNativeLayout(true);
double width = (Math.Round(availableSize.Width) >= Math.Round(Xamarin.Forms.Application.Current.MainPage.Width)) && label.Width > 0 ? Math.Min(label.Width, availableSize.Width) : availableSize.Width;
double height = (Math.Round(availableSize.Height) >= Math.Round(Xamarin.Forms.Application.Current.MainPage.Height)) && label.Height > 0 ? Math.Min(label.Height, availableSize.Height) : availableSize.Height;
if (Double.IsInfinity(availableSize.Width) && (label.Width < 0 || !newElement))
{
width = availableSize.Width;
}
if (Double.IsInfinity(availableSize.Height) && (label.Height < 0 || !newElement))
{
height = availableSize.Height;
}
newElement = false;
if (Element.Width > 0 && Element.Height > 0 && !Double.IsInfinity(width) && !Double.IsInfinity(height)) // This line was causing UWP to fail to correctly update width of BcOperandLabel during editing.
//if (Element.Width > width && Element.Height > height && !Double.IsInfinity(width) && !Double.IsInfinity(height))
{
width = Math.Max(Element.Width, width);
height = Math.Max(Element.Height, height);
}
DebugMessage("[" + _measureOverrideInvocation + "] \t\t width=[" + width + "] height=[" + height + "]");
if (DebugCondition)
{
System.Diagnostics.Debug.WriteLine("");
}
//double width = !double.IsInfinity(availableSize.Width) && label.Width > 0 ? Math.Min(label.Width, availableSize.Width) : availableSize.Width;
//double height = !double.IsInfinity(availableSize.Height) && label.Height > 0 ? Math.Min(label.Height, availableSize.Height) : availableSize.Height;
//double width = availableSize.Width;
//double height = availableSize.Height;
var result = new Windows.Foundation.Size(width, height);
if (textBlock != null)
{
// reset FontSize
var tmpFontSize = label.DecipheredFontSize();
if (DebugCondition)
{
System.Diagnostics.Debug.WriteLine("");
}
if (Element.SynchronizedFontSize > Element.MinFontSize)
{
tmpFontSize = Element.SynchronizedFontSize;
}
var minFontSize = label.DecipheredMinFontSize();
textBlock.MaxLines = 0; // int.MaxValue / 3;
textBlock.MaxWidth = double.PositiveInfinity;
textBlock.MaxHeight = double.PositiveInfinity;
textBlock.MinHeight = 0;
textBlock.MinWidth = 0;
//textBlock.LineStackingStrategy = LineStackingStrategy.
// textBlock.TextWrapping = TextWrapping.WrapWholeWords;
UpdateLineBreakMode(textBlock);
double tmpHt = -1;
textBlock.SetAndFormatText(label, tmpFontSize);
textBlock.Measure(new Windows.Foundation.Size(width, double.PositiveInfinity));
_fontMetrics = textBlock.GetFontMetrics();
if (label.Lines == 0)
{
// do our best job to fit the existing space.
if (textBlock.DesiredSize.Width - width > Precision || textBlock.DesiredSize.Height - height > Precision)
{
tmpFontSize = ZeroLinesFit(label, textBlock, minFontSize, tmpFontSize, width, height);
textBlock.SetAndFormatText(label, tmpFontSize);
textBlock.Measure(new Windows.Foundation.Size(width, double.PositiveInfinity));
}
}
else if (label.AutoFit == AutoFit.Lines)
{
tmpHt = height;
if (height > int.MaxValue / 3)
{
//tmpHt = height = label.Lines * (_fontMetrics.LineHeightForFontSize(tmpFontSize) + ;
tmpHt = height = _fontMetrics.HeightForLinesAtFontSize(label.Lines, tmpFontSize);
}
else
{// set the font size to fit Label.Lines into the available height
//tmpFontSize = _fontMetrics.FontSizeFromLineHeight(height / label.Lines);
tmpFontSize = _fontMetrics.FontSizeFromLinesInHeight(label.Lines, tmpHt);
tmpFontSize = FontExtensions.ClipFontSize(tmpFontSize, label);
textBlock.SetAndFormatText(label, tmpFontSize);
textBlock.Measure(new Windows.Foundation.Size(width, double.PositiveInfinity));
}
}
else if (label.AutoFit == AutoFit.Width)
{
//if (textBlock.DesiredSize.Height / textBlock.LineHeight > label.Lines)
if (textBlock.ActualWidth > textBlock.DesiredSize.Width || textBlock.DesiredSize.Height / textBlock.LineHeight > label.Lines)
{
tmpFontSize = WidthAndLinesFit(label, textBlock, label.Lines, minFontSize, tmpFontSize, width);
textBlock.SetAndFormatText(label, tmpFontSize);
textBlock.Measure(new Windows.Foundation.Size(width, double.PositiveInfinity));
}
}
// autofit is off!
// No need to do anything at the moment. Will textBlock.SetAndFormat and textBlock.Measure at the end
//{
// textBlock.SetAndFormatText(label, tmpFontSize);
// textBlock?.Measure(new Windows.Foundation.Size(w, double.PositiveInfinity));
//}
// none of these should happen so let's keep an eye out for it to be sure everything upstream is working
if (tmpFontSize > label.DecipheredFontSize())
{
throw new Exception("fitting somehow returned a tmpFontSize > label.FontSize");
}
if (tmpFontSize < label.DecipheredMinFontSize())
{
throw new Exception("fitting somehow returned a tmpFontSize < label.MinFontSize");
}
// the following doesn't apply when where growing
//if (tmpFontSize > label.DecipheredMinFontSize() && (textBlock.DesiredSize.Width > Math.Ceiling(w) || textBlock.DesiredSize.Height > Math.Ceiling(Math.Max(availableSize.Height, label.Height))) )
// throw new Exception("We should never exceed the available bounds if the FontSize is greater than label.MinFontSize");
// we needed the following in Android as well. Xamarin layout really doesn't like this to be changed in real time.
if (Element != null && Control != null) // multipicker test was getting here with Element and Control both null
{
if (tmpFontSize == Element.FontSize || (Element.FontSize == -1 && tmpFontSize == FontExtensions.DefaultFontSize()))
{
if (DebugCondition)
{
System.Diagnostics.Debug.WriteLine("");
}
Element.FittedFontSize = -1;
}
else
{
if (DebugCondition)
{
System.Diagnostics.Debug.WriteLine("");
}
Element.FittedFontSize = tmpFontSize;
}
}
DebugMessage("[" + _measureOverrideInvocation + "] MeasureOverride Element.FittedFontSize=[" + Element.FittedFontSize + "]");
/*
* var syncFontSize = ((ILabel)label).SynchronizedFontSize;
* DebugMessage("[" + _measureOverrideInvocation + "] syncFontSize=[" + syncFontSize+"]");
* if (syncFontSize >= 0 && tmpFontSize != syncFontSize)
* {
* tmpHt = -1;
* textBlock.SetAndFormatText(label, syncFontSize);
* textBlock.Measure(new Windows.Foundation.Size(width, double.PositiveInfinity));
* }
* else
* {
* textBlock.SetAndFormatText(label, tmpFontSize);
* textBlock.Measure(new Windows.Foundation.Size(width, double.PositiveInfinity));
* }
*/
result = new Windows.Foundation.Size(Math.Ceiling(textBlock.DesiredSize.Width), Math.Ceiling(tmpHt > -1 ? tmpHt : textBlock.DesiredSize.Height));
if (DebugCondition && label.Width > 0 && label.Height > 0 && (textBlock.DesiredSize.Width > label.Width || textBlock.DesiredSize.Height > label.Height))
{
System.Diagnostics.Debug.WriteLine("");
}
DebugMessage("[" + _measureOverrideInvocation + "] availableSize=[" + availableSize + "] result=[" + result + "] FontSize=[" + textBlock.FontSize + "] LineHeight=[" + textBlock.LineHeight + "] ");
//System.Diagnostics.Debug.WriteLine("[" + _measureOverrideInvocation + "] MeasureOverride [" + (Element.Text ?? Element.HtmlText)+"] availableSize=[" + availableSize + "] result=[" + result + "] FontSize=[" + textBlock.FontSize + "] LineHeight=[" + textBlock.LineHeight + "] ");
textBlock.MaxLines = label.Lines;
}
label.SetIsInNativeLayout(false);
DebugMessage("[" + _measureOverrideInvocation + "] MeasureOverride EXIT");
LayoutValid = true;
_lastAvailableSize = availableSize;
_lastElementSize = Element.Bounds.Size;
_lastAutoFit = label.AutoFit;
_lastLines = label.Lines;
_lastMeasure = DateTime.Now;
_lastMeasureOverrideResult = result;
if (DebugCondition)
{
_measureOverrideInvocation++;
}
return(result);
}
