''
'' This code is part of Document Solutions for PDF demos.
'' Copyright (c) MESCIUS inc. All rights reserved.
''
Imports System.IO
Imports System.Drawing
Imports GrapeCity.Documents.Pdf
Imports GrapeCity.Documents.Text
Imports GrapeCity.Documents.Drawing

'' This sample shows how to hyphenate text that contains soft hyphen characters (0x00AD).
'' Breaks will be inserted at soft hyphen positions (if they are present in the text)
'' if TextLayout.WrapMode Is set to WordWrap. Two properties are provided to control
'' hyphenation:
'' - TextLayout.SoftHyphenReplacementCharCode: specifies the character used As replacement
''   for soft hyphen when breaking words across lines. By default this property Is 0x002D
''   (the Unicode hyphen-minus character). Setting this property to 0 breaks words without
''   showing any visible hyphen character. Setting it to -1 prevents breaking words at soft
''   hyphens).
'' - TextLayout.LinesBetweenConsecutiveHyphens: specifies the minimum number Of non-
''   hyphenated lines between lines ending in a hyphen. By default this property Is zero.
Public Class Hyphenation
    Function CreatePDF(ByVal stream As Stream) As Integer
        '' The online hypho-o tool
        '' was used to insert soft hyphens in the sample text from WordCharWrap:
        Dim str =
            "Lose noth­ing in your doc­u­ments! Grape­City Doc­u­ments for PDF " +
            "in­cludes text and para­graph format­ting, spe­cial char­ac­ters, " +
            "mul­tiple lan­guages, RTL sup­port, ver­tic­al and ro­tated text " +
            "on all sup­por­ted plat­forms."
        '' Replace HTML soft hyphens with Unicode ones:
        str = str.Replace("­", $"{ChrW(&HAD)}")

        Dim doc = New GcPdfDocument()
        Dim page = doc.NewPage()
        Dim g = page.Graphics

        Dim tl = g.CreateTextLayout()
        tl.Append(str)
        tl.DefaultFormat.Font = StandardFonts.Times
        tl.DefaultFormat.FontSize = 12
        tl.MaxWidth = 72 * 3

        '' By default 0x002D (hyphen-minus) will be used as the hyphenation character
        '' when breaking a line at a soft hyphen (0x00AD):
        tl.PerformLayout(True)

        Dim dy = tl.Lines(0).Height + 72 / 16
        Dim rc = New RectangleF(72, 72 + dy, tl.MaxWidth.Value, 72 * 1.4F)

        g.DrawString("Default hyphenation:", tl.DefaultFormat, New PointF(rc.Left, rc.Top - dy))
        g.DrawTextLayout(tl, rc.Location)
        g.DrawRectangle(rc, Color.CornflowerBlue)

        rc.Offset(0, 72 * 2)
        '' This will avoid hyphenating two consecutive lines:
        tl.LinesBetweenConsecutiveHyphens = 1
        '' Changing hyphenation options requires RecalculateGlyphs():
        tl.PerformLayout(True)
        g.DrawString("LinesBetweenConsecutiveHyphens: 1", tl.DefaultFormat, New PointF(rc.Left, rc.Top - dy))
        g.DrawTextLayout(tl, rc.Location)
        g.DrawRectangle(rc, Color.CornflowerBlue)

        rc.Offset(0, 72 * 2)
        '' Reset previous setting:
        tl.LinesBetweenConsecutiveHyphens = 0
        '' Prevent hyphenating words at all:
        tl.SoftHyphenReplacementCharCode = -1
        '' Changing hyphenation options requires RecalculateGlyphs():
        tl.PerformLayout(True)
        g.DrawString("SoftHyphenReplacementCharCode: -1", tl.DefaultFormat, New PointF(rc.Left, rc.Top - dy))
        g.DrawTextLayout(tl, rc.Location)
        g.DrawRectangle(rc, Color.CornflowerBlue)

        '' Done
        doc.Save(stream)
        Return doc.Pages.Count
    End Function
End Class