WPF - FlowDocument - Stretch Table to Entire Width?

Question

I have a DataTable containing an arbitrary number of columns and rows which I am trying to print out. The best luck I've had so far is by putting the data into a Table and then adding the table to a FlowDocument.

So far so good. The problem I have right now is that the Table only "wants" to take up about half of the document's width. I've already set the appropriate values for the FlowDocument's PageWidth and ColumnWidth properties, but the Table doesn't seem to want to stretch to fill up the allotted space?

Answer 1

In order to set your FlowDocument contents to the full available widh you must first know the width of the page. The property you need to set that takes care of the content length is the ColumnWidth prop on the FlowDocument.

I usualy create a "PrintLayout" helper class to keep known presets for the Page width/hight and Padding. Wou can snif presets from Ms Word and fill more.

The class for PrintLayout

public class PrintLayout
{
    public static readonly PrintLayout A4 = new PrintLayout("29.7cm", "42cm", "3.18cm", "2.54cm");
    public static readonly PrintLayout A4Narrow = new PrintLayout("29.7cm", "42cm", "1.27cm", "1.27cm");
    public static readonly PrintLayout A4Moderate = new PrintLayout("29.7cm", "42cm", "1.91cm", "2.54cm");

    private Size _Size;
    private Thickness _Margin;

    public PrintLayout(string w, string h, string leftright, string topbottom) 
        : this(w,h,leftright, topbottom, leftright, topbottom) {
    }

    public PrintLayout(string w, string h, string left, string top, string right, string bottom) {
        var converter = new LengthConverter();
        var width = (double)converter.ConvertFromInvariantString(w);
        var height = (double)converter.ConvertFromInvariantString(h);
        var marginLeft = (double)converter.ConvertFromInvariantString(left);
        var marginTop = (double)converter.ConvertFromInvariantString(top);
        var marginRight = (double)converter.ConvertFromInvariantString(right);
        var marginBottom = (double)converter.ConvertFromInvariantString(bottom);
        this._Size = new Size(width, height);
        this._Margin = new Thickness(marginLeft, marginTop, marginRight, marginBottom);

    }


    public Thickness Margin {
        get { return _Margin; }
        set { _Margin = value; }
    }

    public Size Size {
        get { return _Size; }
    }

    public double ColumnWidth {
        get {
            var column = 0.0;
            column = this.Size.Width - Margin.Left - Margin.Right;
            return column;
        }
    }
}

next on your FlowDocument you can set the presets

On Xaml

<FlowDocument x:Class="WpfApp.MyPrintoutView"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
         xmlns:local="clr-namespace:WpfApp"
         mc:Ignorable="d" 
         PageHeight="{Binding Height, Source={x:Static local:PrintLayout.A4}}"
         PageWidth="{Binding Width, Source={x:Static local:PrintLayout.A4}}"
         PagePadding="{Binding Margin, Source={x:Static local:PrintLayout.A4}}"
         ColumnWidth="{Binding ColumnWidth, Source={x:Static local:PrintLayout.A4}}"
         FontFamily="Segoe WP"
         FontSize="16" ColumnGap="4">
      <!-- flow elements -->
</FlowDocument>

By code

FlowDocument result = new WpfApp.MyPrintoutView();   
result.PageWidth = PrintLayout.A4.Size.Width;
result.PageHeight = PrintLayout.A4.Size.Height;
result.PagePadding = PrintLayout.A4.Margin;
result.ColumnWidth = PrintLayout.A4.ColumnWidth;