/// <summary>
/// Gets the size of the desired.
/// </summary>
/// <returns>The desired size.</returns>
/// <param name="widthConstraint">Width constraint.</param>
/// <param name="heightConstraint">Height constraint.</param>
public override SizeRequest GetDesiredSize(double widthConstraint, double heightConstraint)
{
if (widthConstraint < 0 ||
heightConstraint < 0 ||
_currentDrawState == null ||
_currentDrawState.IsBlank ||
Control == null ||
Element == null)
{
return(new SizeRequest(Size.Zero));
}
//_currentMeasureState?.Dispose();
_currentMeasureState = new TextControlState(_currentDrawState)
{
AvailWidth = widthConstraint,
AvailHeight = heightConstraint
};
if (_currentMeasureState == _lastMeasureState && _lastMeasureResult.HasValue)
{
return(_lastMeasureResult.Value);
}
_lastMeasureResult = InternalLayout(MeasureControl, _currentMeasureState);
//_lastMeasureState?.Dispose();
_lastMeasureState = new TextControlState(_currentMeasureState);
return(_lastMeasureResult.Value);
}
protected override void OnElementChanged(ElementChangedEventArgs <Label> e)
{
if (e.OldElement != null)
{
e.OldElement.RendererIndexAtPoint -= IndexAtPoint;
e.OldElement.RendererSizeForWidthAndFontSize -= LabelF9PSize;
e.OldElement.Draw -= DrawLabel;
}
if (e.NewElement != null)
{
_currentDrawState = new TextControlState();
if (Control == null)
{
var view = new UILabel(CGRect.Empty)
{
BackgroundColor = UIColor.Clear
};
_defaultTextColor = view.TextColor;
SetNativeControl(view);
}
UpdateTextColor();
UpdateFont();
UpdateHorizontalAlignment();
UpdateLineBreakMode();
UpdateStrings();
e.NewElement.RendererIndexAtPoint += IndexAtPoint;
e.NewElement.RendererSizeForWidthAndFontSize += LabelF9PSize;
e.NewElement.Draw += DrawLabel;
}
base.OnElementChanged(e);
}
public static void PropertiesFromControlState(this UILabel label, TextControlState state)
{
if (state.AttributedString != null)
{
label.AttributedText = state.AttributedString;
}
else
{
label.Text = state.Text;
}
label.Font = state.Font;
label.TextAlignment = state.HorizontalTextAlignment;
label.LineBreakMode = state.LineBreakMode;
}
SizeRequest DrawLabel(double width, double height)
{
if (width >= 0 &&
height >= 0 &&
!_currentDrawState.IsBlank &&
Control is UILabel control &&
Element != null)
{
_currentDrawState.AvailWidth = width;
_currentDrawState.AvailHeight = height;
if (_currentDrawState == _lastDrawState && _lastDrawResult.HasValue)
{
return(_lastDrawResult.Value);
}
_lastDrawResult = InternalLayout(control, _currentDrawState);
_lastDrawState = new TextControlState(_currentDrawState);
return(_lastDrawResult.Value);
}
return(new SizeRequest(Xamarin.Forms.Size.Zero));
}
SizeRequest InternalLayout(UILabel control, TextControlState state)
{
if (Element is Forms9Patch.Label element)
{
var tmpFontSize = BoundTextSize(element.FontSize);
if (tmpFontSize < 0)
{
System.Diagnostics.Debug.WriteLine(GetType() + "." + P42.Utils.ReflectionExtensions.CallerMemberName() + ": [" + null + "]");
}
control.PropertiesFromControlState(state);
control.Lines = 0;
if (element.Lines == 0)
{
if (state.AvailHeight < int.MaxValue / 3)
{
tmpFontSize = ZeroLinesFit(control, state.AvailWidth, state.AvailHeight, tmpFontSize);
}
}
else
{
if (element.AutoFit == AutoFit.Lines)
{
if (state.AvailHeight < int.MaxValue / 3)
{
var font = control.Font = UIFont.FromDescriptor(_currentDrawState.FontDescriptor, tmpFontSize);
var lineHeightRatio = font.LineHeight / font.PointSize;
var tmpLineSize = (nfloat)(state.AvailHeight - 0.05f) / element.Lines;
tmpFontSize = tmpLineSize / lineHeightRatio;
}
}
else if (element.AutoFit == AutoFit.Width)
{
tmpFontSize = WidthFit(control, state.AvailWidth, tmpFontSize);
}
}
tmpFontSize = BoundFontSize(tmpFontSize);
if (tmpFontSize < 0)
{
System.Diagnostics.Debug.WriteLine(GetType() + "." + P42.Utils.ReflectionExtensions.CallerMemberName() + ": [" + null + "]");
}
if (Math.Abs(tmpFontSize - element.FittedFontSize) > 0.1)
{
if (element != null && control != null) // multipicker test was getting here with Element and control both null
{
if (System.Math.Abs(tmpFontSize - element.FontSize) < 0.1 || (element.FontSize < 0 && System.Math.Abs(tmpFontSize - UIFont.LabelFontSize) < 0.1))
{
element.FittedFontSize = -1;
}
else
{
element.FittedFontSize = tmpFontSize;
}
}
}
var syncFontSize = (nfloat)((ILabel)element).SynchronizedFontSize;
if (syncFontSize >= 0 && System.Math.Abs(tmpFontSize - syncFontSize) > 0.1)
{
tmpFontSize = syncFontSize;
}
state.FontPointSize = tmpFontSize;
control.Font = state.Font;
control.Lines = 0;
control.AdjustsFontSizeToFitWidth = false;
control.ClearsContextBeforeDrawing = true;
control.ContentMode = UIViewContentMode.Redraw;
CGSize cgSize = LabelSize(control, state.AvailWidth, tmpFontSize);
control.Lines = state.Lines;
double reqWidth = cgSize.Width;
double reqHeight = cgSize.Height + 0.05;
var textHeight = cgSize.Height;
var textLines = Lines(textHeight, control.Font);
if (double.IsPositiveInfinity(state.AvailHeight))
{
if (element.Lines > 0)
{
if (element.AutoFit == AutoFit.Lines)
{
reqHeight = element.Lines * control.Font.LineHeight;
}
else if (element.AutoFit == AutoFit.None && element.Lines <= textLines)
{
reqHeight = element.Lines * control.Font.LineHeight;
}
}
control.Center = new CGPoint(control.Center.X, reqHeight / 2);
}
else
{
var constraintLines = Lines(state.AvailHeight, control.Font);
var constraintLinesHeight = Math.Floor(constraintLines) * control.Font.LineHeight;
if (element.Lines > 0 && element.Lines <= Math.Min(textLines, constraintLines))
{
reqHeight = element.Lines * control.Font.LineHeight;
}
else if (textLines <= constraintLines)
{
reqHeight = textHeight;
}
else if (constraintLines >= 1)
{
reqHeight = constraintLinesHeight;
}
else
{
reqHeight = state.AvailHeight;
}
if (element.VerticalTextAlignment == TextAlignment.Start)
{
control.Center = new CGPoint(control.Center.X, reqHeight / 2);
}
else if (element.VerticalTextAlignment == TextAlignment.End)
{
control.Center = new CGPoint(control.Center.X, state.AvailHeight - reqHeight / 2);
}
}
SizeRequest result;
//if (UIDevice.CurrentDevice.CheckSystemVersion(11, 3))
result = new SizeRequest(new Size(Math.Ceiling(reqWidth), Math.Ceiling(reqHeight)), new Size(10, Math.Ceiling(state.Font.LineHeight)));
//else
// result = new SizeRequest(new Size(Math.Ceiling(reqWidth * 1.25), Math.Ceiling(reqHeight * 1.25)), new Size(10, Math.Ceiling(state.Font.LineHeight)));
return(result);
}
return(new SizeRequest(Size.Zero));
}
