Size LabelF9pSize(double widthConstraint, double fontSize)
{
if (_currentDrawState == null ||
_currentDrawState.IsEmpty ||
Control == null ||
Element == null ||
_disposed)
{
return(Size.Zero);
}
var displayScale = (float)Resources.DisplayMetrics.DensityDpi / (float)Android.Util.DisplayMetricsDensity.Default;
_currentMeasureState = new TextControlState(_currentDrawState)
{
AvailWidth = (int)System.Math.Floor(System.Math.Min(widthConstraint * displayScale, int.MaxValue / 3)),
AvailHeight = int.MaxValue / 3,
TextSize = (float)fontSize,
};
_measureControl = _measureControl ?? new F9PTextView(Settings.Context);
_lastMeasureResult = InternalLayout(_measureControl, _currentMeasureState);
_lastMeasureState = new TextControlState(_currentMeasureState);
return(new Size(_lastMeasureResult.Value.Request.Width / displayScale, _lastMeasureResult.Value.Request.Height / displayScale));
}
SizeRequest DrawLabel(double width, double height)
{
if (_currentDrawState == null ||
_currentDrawState.IsEmpty ||
Control == null ||
Element == null ||
_disposed ||
width < 0 ||
height < 0
)
{
return(new SizeRequest(Size.Zero));
}
if (double.IsInfinity(width))
{
width = int.MaxValue / 3;
}
if (double.IsInfinity(height))
{
height = int.MaxValue / 3;
}
var displayScale = (float)Resources.DisplayMetrics.DensityDpi / (float)Android.Util.DisplayMetricsDensity.Default;
_currentDrawState.AvailWidth = (int)System.Math.Floor(width * displayScale);
_currentDrawState.AvailHeight = (int)System.Math.Floor(height * displayScale);
_lastDrawResult = InternalLayout(Control, _currentDrawState);
_lastDrawState = new TextControlState(_currentDrawState);
return(_lastDrawResult.Value);
}
/// <summary>
/// Raises the element changed event.
/// </summary>
/// <param name="e">E.</param>
protected override void OnElementChanged(ElementChangedEventArgs <Label> e)
{
base.OnElementChanged(e);
_lastMeasureState = null;
_lastDrawResult = null;
_lastMeasureResult = null;
_measureControl?.Dispose();
_measureControl = null;
_currentDrawState = new TextControlState
{
Lines = e.NewElement.Lines,
AutoFit = e.NewElement.AutoFit,
LineBreakMode = e.NewElement.LineBreakMode,
SyncFontSize = (float)e.NewElement.SynchronizedFontSize,
};
if (e.OldElement != null)
{
e.OldElement.RendererIndexAtPoint -= IndexAtPoint;
e.OldElement.RendererSizeForWidthAndFontSize -= LabelF9pSize;
e.OldElement.Draw -= DrawLabel;
Control?.SkipNextInvalidate();
}
if (e.NewElement != null)
{
if (Control == null)
{
var view = new F9PTextView(Context);
InitControl(view);
SetNativeControl(view);
}
else
{
InitControl(Control);
}
Control.IsNativeDrawEnabled = false;
e.NewElement.RendererIndexAtPoint += IndexAtPoint;
e.NewElement.RendererSizeForWidthAndFontSize += LabelF9pSize;
e.NewElement.Draw += DrawLabel;
if (e.NewElement.Width > 0 && e.NewElement.Height > 0)
{
var displayScale = (float)Resources.DisplayMetrics.DensityDpi / (float)Android.Util.DisplayMetricsDensity.Default;
DrawLabel(e.NewElement.Width * displayScale, e.NewElement.Height * displayScale);
}
Control.IsNativeDrawEnabled = true;
}
}
protected override void Dispose(bool disposing)
{
if (!_disposed && disposing)
{
_disposed = true;
if (Element is Forms9Patch.Label element)
{
try // incase it has been garbage collected
{
element.RendererIndexAtPoint -= IndexAtPoint;
element.RendererSizeForWidthAndFontSize -= LabelF9pSize;
element.Draw -= DrawLabel;
}
#pragma warning disable RECS0022 // A catch clause that catches System.Exception and has an empty body
catch (System.Exception) { }
#pragma warning restore RECS0022 // A catch clause that catches System.Exception and has an empty body
}
_currentDrawState = null;
_measureControl?.Dispose();
_measureControl = null;
}
base.Dispose(disposing);
}
SizeRequest InternalLayout(F9PTextView control, TextControlState state)
{
if (Element is Forms9Patch.Label element && control != null)
{
ICharSequence text = state.JavaText;
var tmpFontSize = BoundTextSize(element.FontSize);
control.Typeface = state.Typeface;
//control.SetTextColor(state.TextColor.ToAndroid());
UpdateColor(control);
control.TextSize = tmpFontSize;
control.IsNativeDrawEnabled = false;
control.SetSingleLine(false);
control.SetMaxLines(int.MaxValue / 2);
control.SetIncludeFontPadding(false);
control.Ellipsize = null;
double tmpHt = -1;
double tmpWd = -1;
var fontMetrics = control.Paint.GetFontMetrics();
var fontLineHeight = fontMetrics.Descent - fontMetrics.Ascent;
var fontLeading = System.Math.Abs(fontMetrics.Bottom - fontMetrics.Descent);
if (state.Lines == 0)
{
if (state.AvailHeight < int.MaxValue / 3)
{
tmpFontSize = TextPaintExtensions.ZeroLinesFit(state.JavaText, new TextPaint(control.Paint), ModelMinFontSize, tmpFontSize, state.AvailWidth, state.AvailHeight);
}
}
else
{
if (state.AutoFit == AutoFit.Lines)
{
if (state.AvailHeight > int.MaxValue / 3)
{
tmpHt = System.Math.Round(state.Lines * fontLineHeight + (state.Lines - 1) * fontLeading);
}
else
{
var fontPointSize = tmpFontSize;
var lineHeightRatio = fontLineHeight / fontPointSize;
var leadingRatio = fontLeading / fontPointSize;
tmpFontSize = ((state.AvailHeight / (state.Lines + leadingRatio * (state.Lines - 1))) / lineHeightRatio - 0.1f);
}
}
else if (state.AutoFit == AutoFit.Width)
{
tmpFontSize = TextPaintExtensions.WidthFit(state.JavaText, new TextPaint(control.Paint), state.Lines, ModelMinFontSize, tmpFontSize, state.AvailWidth, state.AvailHeight);
}
}
tmpFontSize = BoundTextSize(tmpFontSize);
// this is the optimal font size. Let it be known!
if (System.Math.Abs(tmpFontSize - element.FittedFontSize) > 0.1)
{
if (System.Math.Abs(tmpFontSize - element.FontSize) < 0.1 || (element.FontSize < 0 && System.Math.Abs(tmpFontSize - F9PTextView.DefaultTextSize) < 0.1))
{
element.FittedFontSize = -1;
}
else
{
element.FittedFontSize = tmpFontSize;
}
}
var syncFontSize = (float)((ILabel)element).SynchronizedFontSize;
if (syncFontSize >= 0 && System.Math.Abs(tmpFontSize - syncFontSize) > 0.1)
{
tmpFontSize = syncFontSize;
}
control.TextSize = tmpFontSize;
state.RenderedFontSize = tmpFontSize;
var layout = TextExtensions.StaticLayout(state.JavaText, new TextPaint(control.Paint), state.AvailWidth, Android.Text.Layout.Alignment.AlignNormal, 1.0f, 0.0f, true);
int lines = state.Lines;
if (lines == 0 && state.AutoFit == AutoFit.None)
{
for (int i = 0; i < layout.LineCount; i++)
{
if (layout.GetLineBottom(i) <= state.AvailHeight - layout.TopPadding - layout.BottomPadding)
{
lines++;
}
else
{
break;
}
}
}
if (layout.Height > state.AvailHeight || (lines > 0 && layout.LineCount > lines))
{
if (state.Lines == 1)
{
control.SetSingleLine(true);
control.SetMaxLines(1);
control.Ellipsize = state.LineBreakMode.ToEllipsize();
}
else
{
layout = TextPaintExtensions.Truncate(state.Text, element.F9PFormattedString, new TextPaint(control.Paint), state.AvailWidth, state.AvailHeight, element.AutoFit, element.LineBreakMode, ref lines, ref text);
}
}
lines = lines > 0 ? System.Math.Min(lines, layout.LineCount) : layout.LineCount;
for (int i = 0; i < lines; i++)
{
tmpHt = layout.GetLineBottom(i);
var width = layout.GetLineWidth(i);
if (width > tmpWd)
{
tmpWd = System.Math.Ceiling(width);
}
}
if (state.AutoFit == AutoFit.None && state.Lines > 0)
{
control.SetMaxLines(state.Lines);
}
if (element.IsDynamicallySized && state.Lines > 0 && state.AutoFit == AutoFit.Lines)
{
fontMetrics = control.Paint.GetFontMetrics();
fontLineHeight = fontMetrics.Descent - fontMetrics.Ascent;
fontLeading = System.Math.Abs(fontMetrics.Bottom - fontMetrics.Descent);
tmpHt = fontLineHeight * state.Lines + fontLeading * (state.Lines - 1);
}
control.Gravity = element.HorizontalTextAlignment.ToHorizontalGravityFlags() | element.VerticalTextAlignment.ToVerticalGravityFlags();
if (element.Text != null)
{
control.Text = text.ToString();
}
else
{
control.TextFormatted = text;
}
var result = new SizeRequest(new Size(System.Math.Ceiling(tmpWd), System.Math.Ceiling(tmpHt)), new Size(10, System.Math.Ceiling(tmpHt)));
if (element.LineBreakMode == LineBreakMode.NoWrap)
{
control.SetSingleLine(true);
}
control.IsNativeDrawEnabled = true;
if (control == Control)
{
//P42.Utils.Debug.Message(Element?.HtmlText, "!!!~~~~~~~ REQUEST LAYOUT~~~~~~~~~!!!");
// none of the below seems to help the issue where the label is not apparing in ConnectionCalc cells
//Control.RequestLayout();
////P42.Utils.Debug.Message(Element?.HtmlText, "Control.Invalidate()");
//Control.Invalidate();
//Invalidate();
//var widthSpec = MeasureSpec.MakeMeasureSpec(tmpWd, Android.Views.MeasureSpecMode.Exactly);
//var heightSpec = MeasureSpec.MakeMeasureSpec(tmpHt, Android.Views.MeasureSpecMode.Exactly);
//Control.Measure(widthSpec, heightSpec);
//Control.RequestLayout();
//Control.Layout(0, 0, (int)System.Math.Ceiling(tmpWd), (int)System.Math.Ceiling(tmpHt));
//Control
}
return(result);
}
return(new SizeRequest(Size.Zero));
}
/// <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(int widthConstraint, int heightConstraint)
{
if (_currentDrawState == null ||
_currentDrawState.IsEmpty ||
Control == null ||
Element == null ||
_disposed)
{
return(new SizeRequest(Size.Zero));
}
var width = MeasureSpec.GetSize(widthConstraint);
if (MeasureSpec.GetMode(widthConstraint) == Android.Views.MeasureSpecMode.Unspecified)
{
width = int.MaxValue / 2;
}
var height = MeasureSpec.GetSize(heightConstraint);
if (MeasureSpec.GetMode(heightConstraint) == Android.Views.MeasureSpecMode.Unspecified)
{
height = int.MaxValue / 2;
}
if (width <= 0 || height <= 0)
{
return(new SizeRequest(Size.Zero));
}
_currentMeasureState = new TextControlState(_currentDrawState)
{
AvailWidth = width,
AvailHeight = height
};
if (_lastMeasureResult != null && _lastMeasureResult.HasValue &&
_lastMeasureState == _currentMeasureState &&
_lastMeasureResult.Value.Request.Width > 0 &&
_lastMeasureResult.Value.Request.Height > 0 &&
_lastMeasureState.RenderedFontSize >= _currentMeasureState.TextSize &&
_lastMeasureResult.Value.Request.Width <= _currentMeasureState.AvailWidth &&
_lastMeasureResult.Value.Request.Height <= _currentMeasureState.AvailHeight
)
{
return(_lastMeasureResult.Value);
}
if (_lastDrawResult != null && _lastDrawResult.HasValue &&
_lastDrawState == _currentMeasureState &&
_lastDrawResult.Value.Request.Width > 0 &&
_lastDrawResult.Value.Request.Height > 0 &&
_lastDrawState.RenderedFontSize >= _currentDrawState.TextSize &&
_lastDrawResult.Value.Request.Width <= _currentMeasureState.AvailWidth &&
_lastDrawResult.Value.Request.Height <= _currentMeasureState.AvailWidth)
{
return(_lastDrawResult.Value);
}
_measureControl = _measureControl ?? new F9PTextView(Settings.Context);
_lastMeasureResult = InternalLayout(_measureControl, _currentMeasureState);
_lastMeasureState = new TextControlState(_currentMeasureState);
return(_lastMeasureResult.Value);
}
