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Improve word wrap measurements

This commit is contained in:
Frank A. Krueger 2018-04-15 21:21:45 -07:00
parent 95b76f3783
commit cfa3078528
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GPG Key ID: 0471C67474FFE664
3 changed files with 39 additions and 33 deletions
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46
Ooui.Forms/Extensions/FontExtensions.cs
View File

@ -44,7 +44,7 @@ namespace Ooui.Forms.Extensions
return Size.Zero;
var fontHeight = fontSize;
var lineHeight = fontHeight * 1.4;
var lineHeight = (int)(fontSize * 1.42857143); // Floor is intentional -- browsers round down
var isBold = fontAttrs.HasFlag (FontAttributes.Bold);
@ -55,40 +55,40 @@ namespace Ooui.Forms.Extensions
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 firstSpaceX = -1.0;
var lastSpaceIndex = -1;
var lineStartIndex = 0;
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) {
if (px + pw > pwidthConstraint && lastSpaceIndex > 0) {
lines++;
if (lastSpaceWidth > 0) {
maxPWidth = Math.Max (maxPWidth, lastSpaceWidth + pwidthHack);
px = pw - lastSpaceWidth;
lastSpaceWidth = -1;
}
else {
maxPWidth = Math.Max (maxPWidth, px + pwidthHack);
px = 0;
}
maxPWidth = Math.Max (maxPWidth, firstSpaceX);
i = lastSpaceIndex;
while (i < n && text[i] == ' ') i++;
i--;
px = 0;
firstSpaceX = -1;
lastSpaceIndex = -1;
lineStartIndex = i + 1;
}
if (c == ' ') {
lastSpaceWidth = pw;
else {
if (c == ' ') {
if (i >= lineStartIndex && text[i-1] != ' ')
firstSpaceX = px;
lastSpaceIndex = i;
}
px += pw;
}
px += pw;
}
maxPWidth = Math.Max (maxPWidth, px + pwidthHack);
var width = fontSize * maxPWidth;
maxPWidth = Math.Max (maxPWidth, px);
var width = (int)Math.Ceiling (fontSize * maxPWidth);
var height = lines * lineHeight;
// Console.WriteLine ($"MEASURE TEXT SIZE {widthConstraint}x{heightConstraint} \"{text}\" == {width}x{height}");
//Console.WriteLine ($"MEASURE TEXT SIZE {widthConstraint}x{heightConstraint} ==> {width}x{height} \"{text}\"");
return new Size (width, height);
}

2
Ooui/UI.cs
View File

@ -392,7 +392,7 @@ namespace Ooui
</head>
<body>");
writer.WriteLine (BodyHeaderHtml);
writer.WriteLine (@"<div id=""ooui-body"" class=""container-fluid"">");
writer.WriteLine (@"<div id=""ooui-body"" class=""container-fluid"" style=""padding:0;margin:0"">");
writer.WriteLine (initialHtml);
writer.Write (@"</div>

24
Samples/WrappingTextSample.cs
View File

@ -24,17 +24,11 @@ namespace Samples
rows.Children.Add (row1);
var row0s = new StackLayout { Orientation = StackOrientation.Horizontal, BackgroundColor = Color.Azure };
row0s.Children.Add (new Label { Text = shortText, LineBreakMode = LineBreakMode.WordWrap, WidthRequest = 100 });
row0s.Children.Add (new Label { Text = mediumText, LineBreakMode = LineBreakMode.WordWrap, WidthRequest = 100 });
row0s.Children.Add (new Label { Text = longText, LineBreakMode = LineBreakMode.WordWrap, WidthRequest = 100 });
row0s.Children.Add (new Label { Text = shortText, LineBreakMode = LineBreakMode.WordWrap, WidthRequest = 200 });
row0s.Children.Add (new Label { Text = mediumText, LineBreakMode = LineBreakMode.WordWrap, WidthRequest = 200 });
row0s.Children.Add (new Label { Text = longText, LineBreakMode = LineBreakMode.WordWrap, WidthRequest = 200 });
rows.Children.Add (new ScrollView { Content = row0s });
var row1s = new StackLayout { Orientation = StackOrientation.Horizontal, BackgroundColor = Color.GhostWhite };
row1s.Children.Add (new Label { Text = shortText, FontAttributes = FontAttributes.Bold, WidthRequest = 100, HorizontalOptions = LayoutOptions.Start });
row1s.Children.Add (new Label { Text = mediumText, FontAttributes = FontAttributes.Bold, WidthRequest = 100, HorizontalOptions = LayoutOptions.FillAndExpand });
row1s.Children.Add (new Label { Text = longText, FontAttributes = FontAttributes.Bold, WidthRequest = 100, HorizontalOptions = LayoutOptions.End });
rows.Children.Add (new ScrollView { Content = row1s });
var row2 = new StackLayout { Orientation = StackOrientation.Horizontal, BackgroundColor = Color.Azure };
row2.Children.Add (new Entry { Text = shortText, FontSize = 8, VerticalOptions = LayoutOptions.Center });
row2.Children.Add (new Entry { Text = shortText, FontSize = 16, VerticalOptions = LayoutOptions.Center });
@ -66,6 +60,18 @@ namespace Samples
row6.Children.Add (new TimePicker { VerticalOptions = LayoutOptions.Center });
rows.Children.Add (row6);
var row7 = new StackLayout { Orientation = StackOrientation.Horizontal, BackgroundColor = Color.Azure };
row7.Children.Add (new Label { Text = shortText, FontSize = 32, LineBreakMode = LineBreakMode.WordWrap });
row7.Children.Add (new Label { Text = mediumText, FontSize = 16, LineBreakMode = LineBreakMode.WordWrap });
row7.Children.Add (new Label { Text = longText, FontSize = 8, LineBreakMode = LineBreakMode.WordWrap });
rows.Children.Add (row7);
var row8 = new StackLayout { Orientation = StackOrientation.Horizontal, BackgroundColor = Color.GhostWhite };
row8.Children.Add (new Label { Text = shortText, FontSize = 32, FontAttributes = FontAttributes.Bold, HorizontalOptions = LayoutOptions.Start });
row8.Children.Add (new Label { Text = mediumText, FontSize = 16, FontAttributes = FontAttributes.Bold, HorizontalOptions = LayoutOptions.FillAndExpand });
row8.Children.Add (new Label { Text = longText, FontSize = 8, FontAttributes = FontAttributes.Bold, HorizontalOptions = LayoutOptions.End });
rows.Children.Add (row8);
var page = new ContentPage
{
Content = rows