protected override float?computeDistanceToActualBaseline(TextBaseline baseline)
{
if (this.child != null)
{
return(this.child.getDistanceToActualBaseline(baseline));
}
return(base.computeDistanceToActualBaseline(baseline));
}
public PlaceholderSpan(
TextBaseline baseline = TextBaseline.alphabetic,
TextStyle style = null,
PlaceholderAlignment alignment = PlaceholderAlignment.bottom
) : base(style: style)
{
this.baseline = baseline;
this.alignment = alignment;
}
public double computeDistanceToActualBaseline(TextBaseline baseline)
{
Debug.Assert(!this._needsLayout);
switch (baseline)
{
case TextBaseline.alphabetic:
return(this._paragraph.alphabeticBaseline);
case TextBaseline.ideographic:
return(this._paragraph.ideographicBaseline);
}
return(0.0);
}
public float?defaultComputeDistanceToFirstActualBaseline(TextBaseline baseline)
{
var child = this.firstChild;
while (child != null)
{
var childParentData = (ParentDataType)child.parentData;
float?result = child.getDistanceToActualBaseline(baseline);
if (result != null)
{
return(result.Value + childParentData.offset.dy);
}
child = childParentData.nextSibling;
}
return(null);
}
private float GetFontBaseline(TextBaseline baseline, SKPaint paint)
{
switch (baseline)
{
case TextBaseline.Top: // TopTextBaseline
return(paint.FontMetrics.Ascent);
case TextBaseline.Middle: // MiddleTextBaseline
return(-paint.FontMetrics.Descent + paint.TextSize / 2);
case TextBaseline.Bottom: // BottomTextBaseline
return(-paint.FontMetrics.Descent);
default:
break;
}
return(0);
}
private float GetFontBaseline(TextBaseline baseline, SKPaint paint)
{
switch (baseline)
{
case TextBaseline.Top: // TopTextBaseline
// https://chromium.googlesource.com/chromium/blink/+/master/Source/modules/canvas2d/CanvasRenderingContext2D.cpp#2056
// According to http://wiki.apache.org/xmlgraphics-fop/LineLayout/AlignmentHandling
// "FOP (Formatting Objects Processor) puts the hanging baseline at 80% of the ascender height"
return((-paint.FontMetrics.Ascent * 4) / 5);
case TextBaseline.Middle: // MiddleTextBaseline
return(-paint.FontMetrics.Descent + paint.TextSize / 2);
case TextBaseline.Bottom: // BottomTextBaseline
return(-paint.FontMetrics.Descent);
default:
break;
}
return(0);
}
public override float?computeDistanceToActualBaseline(TextBaseline baseline)
{
float?result;
if (child != null)
{
D.assert(!debugNeedsLayout);
result = child.getDistanceToActualBaseline(baseline);
var childParentData = (BoxParentData)child.parentData;
if (result != null)
{
result += childParentData.offset.dy;
}
}
else
{
result = base.computeDistanceToActualBaseline(baseline);
}
return(result);
}
public TextStyle(Color color = null, float?fontSize = null,
FontWeight fontWeight = null, FontStyle?fontStyle = null, float?letterSpacing = null,
float?wordSpacing = null, TextBaseline?textBaseline = null, float?height = null,
TextDecoration decoration = null, TextDecorationStyle?decorationStyle = null, Color decorationColor = null,
string fontFamily = null,
Paint background = null
)
{
this.color = color ?? this.color;
this.fontSize = fontSize ?? this.fontSize;
this.fontWeight = fontWeight ?? this.fontWeight;
this.fontStyle = fontStyle ?? this.fontStyle;
this.letterSpacing = letterSpacing ?? this.letterSpacing;
this.wordSpacing = wordSpacing ?? this.wordSpacing;
this.fontSize = fontSize ?? this.fontSize;
this.textBaseline = textBaseline ?? this.textBaseline;
this.height = height ?? this.height;
this.decoration = decoration ?? this.decoration;
this.decorationStyle = decorationStyle ?? this.decorationStyle;
this.decorationColor = decorationColor ?? this.decorationColor;
this.fontFamily = fontFamily ?? this.fontFamily;
this.background = background ?? this.background;
}
internal _RenderButtonBarRow(
List <RenderBox> children = null,
Axis direction = Axis.horizontal,
MainAxisSize mainAxisSize = MainAxisSize.max,
MainAxisAlignment mainAxisAlignment = MainAxisAlignment.start,
CrossAxisAlignment crossAxisAlignment = CrossAxisAlignment.center,
TextDirection textDirection = TextDirection.ltr,
VerticalDirection verticalDirection = VerticalDirection.down,
TextBaseline textBaseline = TextBaseline.alphabetic,
float?overflowButtonSpacing = null
) : base(
children: children,
direction: direction,
mainAxisSize: mainAxisSize,
mainAxisAlignment: mainAxisAlignment,
crossAxisAlignment: crossAxisAlignment,
textDirection: textDirection,
verticalDirection: verticalDirection,
textBaseline: textBaseline
)
{
D.assert(overflowButtonSpacing == null || overflowButtonSpacing >= 0);
this.overflowButtonSpacing = overflowButtonSpacing;
}
protected override float?computeDistanceToActualBaseline(TextBaseline baseline)
{
return(this._baselineDistance);
}
static double _boxBaseline(RenderBox box, TextBaseline baseline)
{
return(box.getDistanceToBaseline(baseline) ?? 0.0);
}
public void SetTextBaseline(TextBaseline value)
{
this.TextBaseline = value;
this.CallMethod <object>(TEXTBASELINE_PROPERTY, value.ToString().ToLowerInvariant());
}
public override float?computeDistanceToActualBaseline(TextBaseline baseline)
{
D.assert(!debugNeedsLayout);
return(_baselineDistance);
}
internal void DrawText(string text, FontCi font, float x, float y, TextAlign align, TextBaseline baseline)
{
TextTexture t = GetTextTexture(text, font);
int dx = 0;
int dy = 0;
if (align == TextAlign.Center)
{
dx -= t.textwidth / 2;
}
if (align == TextAlign.Right)
{
dx -= t.textwidth;
}
if (baseline == TextBaseline.Middle)
{
dy -= t.textheight / 2;
}
if (baseline == TextBaseline.Bottom)
{
dy -= t.textheight;
}
Draw2dQuad(t.texture, x + dx, y + dy, t.texturewidth, t.textureheight);
}
protected override double?computeDistanceToActualBaseline(TextBaseline baseline)
{
return(this.defaultComputeDistanceToFirstActualBaseline(baseline));
}
protected override double?computeDistanceToActualBaseline(TextBaseline baseline)
{
this._layoutText(this.constraints.maxWidth);
return(this._textPainter.computeDistanceToActualBaseline(baseline));
}
public Task SetTextBaseline(TextBaseline value) => _jsRuntime.InvokeAsync<Task>("canvasOperator.setCanvasProperty", Canvas, ContextProperties.TextBaseline, value);
public GdiCanvas()
{
_width = 1;
_height = 1;
_currentPath = new GraphicsPath(FillMode.Winding);
_stringFormat = new StringFormat();
_stringFormat.LineAlignment = StringAlignment.Near;
_lineWidth = 1;
_currentX = 0;
_currentY = 0;
_font = new GdiFont("Arial", 10, GraphicsUnit.Pixel);
_textAlign = TextAlign.Left;
_textBaseline = TextBaseline.Top;
Color = new Color(255, 255, 255);
RecreateImage();
}
public static void SetLineAlignment(DependencyObject obj, TextBaseline value)
{
obj.SetValue(LineAlignmentProperty, value);
}
public AlignmentConverter(TextAlign textAlign, TextBaseline textBaseline)
{
_textAlign = textAlign;
_textBaseline = textBaseline;
}
float computeDistanceToActualBaseline(TextBaseline baseline)
{
return(child.computeDistanceToActualBaseline(baseline).Value +
horizontalBorderSide.width);
}
public AlignmentConverter(TextAlign textAlign, TextBaseline textBaseline)
{
_textAlign = textAlign;
_textBaseline = textBaseline;
}
internal void DrawText(string text, float fontSize, float x, float y, TextAlign align, TextBaseline baseline)
{
TextTexture t = GetTextTexture(text, fontSize);
int dx = 0;
int dy = 0;
if (align == TextAlign.Center)
{
dx -= t.textwidth / 2;
}
if (align == TextAlign.Right)
{
dx -= t.textwidth;
}
if (baseline == TextBaseline.Middle)
{
dy -= t.textheight / 2;
}
if (baseline == TextBaseline.Bottom)
{
dy -= t.textheight;
}
Draw2dQuad(t.texture, x + dx, y + dy, t.texturewidth, t.textureheight);
}
public static void SetLineAlignment(DependencyObject obj, TextBaseline value)
{
obj.SetValue(LineAlignmentProperty, value);
}
