Ooui-tws-port/Ooui.Forms/Extensions/FontExtensions.cs

169 lines
9.1 KiB
C#

using System;
using Xamarin.Forms;
namespace Ooui.Forms.Extensions
{
public static class FontExtensions
{
public static void SetStyleFont (this View view, string family, double size, FontAttributes attrs, Style style)
{
#pragma warning disable RECS0018 // Comparison of floating point numbers with equality operator
if (size == 14.0) {
style.FontSize = null;
}
else {
style.FontSize = size;
}
#pragma warning restore RECS0018 // Comparison of floating point numbers with equality operator
if (string.IsNullOrEmpty (family)) {
style.FontFamily = null;
}
else {
style.FontFamily = family;
}
if (attrs.HasFlag (FontAttributes.Bold)) {
style.FontWeight = "bold";
}
else {
style.FontWeight = null;
}
if (attrs.HasFlag (FontAttributes.Italic)) {
style.FontStyle = "italic";
}
else {
style.FontStyle = null;
}
}
public static Size MeasureSize (this string text, string fontFamily, double fontSize, FontAttributes fontAttrs, double widthConstraint, double heightConstraint)
{
if (string.IsNullOrEmpty (text))
return Size.Zero;
var fontHeight = fontSize;
var lineHeight = fontHeight * 1.4;
var isBold = fontAttrs.HasFlag (FontAttributes.Bold);
var props = isBold ? BoldCharacterProportions : CharacterProportions;
var avgp = isBold ? BoldAverageCharProportion : AverageCharProportion;
var px = 0.0;
var lines = 1;
var maxPWidth = 0.0;
var pwidthConstraint = double.IsPositiveInfinity (widthConstraint) ? double.PositiveInfinity : widthConstraint / fontSize;
var lastSpaceWidth = -1.0;
// Tiny little padding to account for sampling errors
var pwidthHack = 1.0e-6;
var plineHack = 0.333;
var n = text != null ? text.Length : 0;
for (var i = 0; i < n; i++) {
var c = (int)text[i];
var pw = (c < 128) ? props[c] : avgp;
// Should we wrap?
if (px + pw + plineHack > pwidthConstraint) {
lines++;
if (lastSpaceWidth > 0) {
maxPWidth = Math.Max (maxPWidth, lastSpaceWidth + pwidthHack);
px = pw - lastSpaceWidth;
lastSpaceWidth = -1;
}
else {
maxPWidth = Math.Max (maxPWidth, px + pwidthHack);
px = 0;
}
}
if (c == ' ') {
lastSpaceWidth = pw;
}
px += pw;
}
maxPWidth = Math.Max (maxPWidth, px + pwidthHack);
var width = fontSize * maxPWidth;
var height = lines * lineHeight;
// Console.WriteLine ($"MEASURE TEXT SIZE {widthConstraint}x{heightConstraint} \"{text}\" == {width}x{height}");
return new Size (width, height);
}
public static Size MeasureSize (this string text, Style style, double widthConstraint, double heightConstraint)
{
// System.Console.WriteLine("!!! MEASURE STYLED TEXT SIZE: " + style);
return MeasureSize (text, "", 14, FontAttributes.None, widthConstraint, heightConstraint);
}
public static string ToOouiTextAlign (this TextAlignment align)
{
switch (align) {
case TextAlignment.Start:
default:
return "start";
case TextAlignment.Center:
return "center";
case TextAlignment.End:
return "end";
}
}
public static string ToOouiVerticalAlign (this TextAlignment align)
{
switch (align) {
case TextAlignment.Start:
default:
return "top";
case TextAlignment.Center:
return "middle";
case TextAlignment.End:
return "bottom";
}
}
static readonly double[] CharacterProportions = {
0, 0, 0, 0, 0, 0, 0, 0,
0, 0.27799999713897705, 0.27799999713897705, 0.27799999713897705, 0.27799999713897705, 0.27799999713897705, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0.27799999713897705, 0.25899994373321533, 0.4259999990463257, 0.5560001134872437, 0.5560001134872437, 1.0000001192092896, 0.6299999952316284, 0.27799999713897705,
0.25899994373321533, 0.25899994373321533, 0.3520001173019409, 0.6000000238418579, 0.27799999713897705, 0.3890000581741333, 0.27799999713897705, 0.3330000638961792,
0.5560001134872437, 0.5560001134872437, 0.5560001134872437, 0.5560001134872437, 0.5560001134872437, 0.5560001134872437, 0.5560001134872437, 0.5560001134872437,
0.5560001134872437, 0.5560001134872437, 0.27799999713897705, 0.27799999713897705, 0.6000000238418579, 0.6000000238418579, 0.6000000238418579, 0.5560001134872437,
0.8000000715255737, 0.6480001211166382, 0.6850000619888306, 0.722000002861023, 0.7040001153945923, 0.6110001802444458, 0.5740000009536743, 0.7589999437332153,
0.722000002861023, 0.25899994373321533, 0.5190001726150513, 0.6669999361038208, 0.5560001134872437, 0.8709999322891235, 0.722000002861023, 0.7600001096725464,
0.6480001211166382, 0.7600001096725464, 0.6850000619888306, 0.6480001211166382, 0.5740000009536743, 0.722000002861023, 0.6110001802444458, 0.9259999990463257,
0.6110001802444458, 0.6480001211166382, 0.6110001802444458, 0.25899994373321533, 0.3330000638961792, 0.25899994373321533, 0.6000000238418579, 0.5000001192092896,
0.22200000286102295, 0.5370000600814819, 0.593000054359436, 0.5370000600814819, 0.593000054359436, 0.5370000600814819, 0.2960001230239868, 0.5740000009536743,
0.5560001134872437, 0.22200000286102295, 0.22200000286102295, 0.5190001726150513, 0.22200000286102295, 0.8530000448226929, 0.5560001134872437, 0.5740000009536743,
0.593000054359436, 0.593000054359436, 0.3330000638961792, 0.5000001192092896, 0.31500017642974854, 0.5560001134872437, 0.5000001192092896, 0.7580000162124634,
0.5180000066757202, 0.5000001192092896, 0.4800001382827759, 0.3330000638961792, 0.22200000286102295, 0.3330000638961792, 0.6000000238418579, 0
};
const double AverageCharProportion = 0.5131400561332703;
static readonly double[] BoldCharacterProportions = {
0, 0, 0, 0, 0, 0, 0, 0,
0, 0.27799999713897705, 0.27799999713897705, 0.27799999713897705, 0.27799999713897705, 0.27799999713897705, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0.27799999713897705, 0.27799999713897705, 0.46299993991851807, 0.5560001134872437, 0.5560001134872437, 1.0000001192092896, 0.6850000619888306, 0.27799999713897705,
0.2960001230239868, 0.2960001230239868, 0.40700018405914307, 0.6000000238418579, 0.27799999713897705, 0.40700018405914307, 0.27799999713897705, 0.37099993228912354,
0.5560001134872437, 0.5560001134872437, 0.5560001134872437, 0.5560001134872437, 0.5560001134872437, 0.5560001134872437, 0.5560001134872437, 0.5560001134872437,
0.5560001134872437, 0.5560001134872437, 0.27799999713897705, 0.27799999713897705, 0.6000000238418579, 0.6000000238418579, 0.6000000238418579, 0.5560001134872437,
0.8000000715255737, 0.6850000619888306, 0.7040001153945923, 0.7410000562667847, 0.7410000562667847, 0.6480001211166382, 0.593000054359436, 0.7589999437332153,
0.7410000562667847, 0.29499995708465576, 0.5560001134872437, 0.722000002861023, 0.593000054359436, 0.9070001840591431, 0.7410000562667847, 0.777999997138977,
0.6669999361038208, 0.777999997138977, 0.722000002861023, 0.6490000486373901, 0.6110001802444458, 0.7410000562667847, 0.6299999952316284, 0.9440001249313354,
0.6669999361038208, 0.6669999361038208, 0.6480001211166382, 0.3330000638961792, 0.37099993228912354, 0.3330000638961792, 0.6000000238418579, 0.5000001192092896,
0.25899994373321533, 0.5740000009536743, 0.6110001802444458, 0.5740000009536743, 0.6110001802444458, 0.5740000009536743, 0.3330000638961792, 0.6110001802444458,
0.593000054359436, 0.2580000162124634, 0.27799999713897705, 0.5740000009536743, 0.2580000162124634, 0.906000018119812, 0.593000054359436, 0.6110001802444458,
0.6110001802444458, 0.6110001802444458, 0.3890000581741333, 0.5370000600814819, 0.3520001173019409, 0.593000054359436, 0.5200001001358032, 0.8140000104904175,
0.5370000600814819, 0.5190001726150513, 0.5190001726150513, 0.3330000638961792, 0.223000168800354, 0.3330000638961792, 0.6000000238418579, 0
};
const double BoldAverageCharProportion = 0.5346300601959229;
}
}