//-------------------------------------------------------------------
//
// Public Properties + Dependency Properties's
//
//-------------------------------------------------------------------
#region Public Properties
//having this invalidate callback allows to host UIElements in Canvas and still
//receive invalidations when Left/Top/Bottom/Right properties change -
//registering the attached properties with AffectsParentArrange flag would be a mistake
//because those flags only work for FrameworkElements
private static void OnPositioningChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
UIElement uie = d as UIElement;
if (uie != null)
{
Canvas p = VisualTreeHelper.GetParent(uie) as Canvas;
if (p != null)
{
p.InvalidateArrange();
}
}
}
/// <summary>
/// Prints a FrameworkElement in landscape, automatically rotating element if necessary
/// </summary>
/// <param name="DocumentName"></param>
/// <param name="PrintableElement"></param>
/// <param name="footerText"></param>
public static void PrintElement(string DocumentName, FrameworkElement PrintableElement, string footerText)
{
PrintDocument p = new PrintDocument();
Panel printableParent = PrintableElement.Parent as Panel;
bool okToPrint = false;
System.Windows.Controls.Panel tmp = new System.Windows.Controls.Canvas();
p.BeginPrint += (object sender, BeginPrintEventArgs e) =>
{
((Panel)PrintableElement.Parent).Children.Remove(PrintableElement);
tmp.Children.Add(PrintableElement);
tmp.Children.Add(new TextBlock
{
VerticalAlignment = System.Windows.VerticalAlignment.Bottom,
Text = footerText,
FontSize = 8
});
};
p.EndPrint += (s2, e2) =>
{
tmp.Children.Remove(PrintableElement);
printableParent.Children.Add(PrintableElement);
PrintableElement.HorizontalAlignment = HorizontalAlignment.Stretch;
PrintableElement.VerticalAlignment = VerticalAlignment.Stretch;
PrintableElement.Margin = new Thickness(0);
};
p.PrintPage += (object s, PrintPageEventArgs e) =>
{
// Rotate to landscape if necessary
if (e.PrintableArea.Height > e.PrintableArea.Width)
{
double scale = e.PrintableArea.Height / e.PrintableArea.Width;
scale = 1.0;
tmp.Width = e.PrintableArea.Height;
tmp.Height = e.PrintableArea.Width * scale;
CompositeTransform transform = new CompositeTransform
{
Rotation = 90,
TranslateX = tmp.Height * scale,
ScaleX = scale,
ScaleY = scale
};
tmp.RenderTransform = transform;
tmp.RenderTransformOrigin = new Point(0.5, 0.5);
PrintableElement.Margin = new Thickness(48 / scale, 96 / scale, 48 / scale, 0);
PrintableElement.Width = tmp.Width - 96 / scale;
PrintableElement.Height = tmp.Height - 96 / scale;
}
else
{
tmp.Width = e.PrintableArea.Width;
tmp.Height = e.PrintableArea.Height;
PrintableElement.Margin = new Thickness(48, 96, 0, 0);
PrintableElement.Width = tmp.Width - 96;
PrintableElement.Height = tmp.Height - 96;
}
PrintableElement.HorizontalAlignment = System.Windows.HorizontalAlignment.Stretch;
PrintableElement.VerticalAlignment = System.Windows.VerticalAlignment.Stretch;
tmp.InvalidateArrange();
tmp.InvalidateMeasure();
okToPrint = true;
//tmp.SizeChanged += (s2, e2) => { okToPrint = true; };
//PrintableElement.SizeChanged += (s2, e2) => { okToPrint = true; };
if (okToPrint)
{
e.PageVisual = tmp;
e.HasMorePages = false;
}
else
{
e.PageVisual = null;
e.HasMorePages = true;
}
};
p.Print(DocumentName);
}
public void CanvasCallsLayoutTest ()
{
var parent = new Canvas ();
LayoutPoker c = new LayoutPoker ();
parent.Children.Add (c);
c.Width = 50;
c.Height = 50;
int measure_called = 0;
int arrange_called = 0;
c.Measured += (Size real) => {
c.MeasureResult = real;
measure_called++;
};
c.Arranged += (Size real) => {
c.ArrangeResult = real;
arrange_called++;
};
parent.Measure (new Size (100, 100));
Assert.AreEqual (0, arrange_called, "arrange called 0");
Assert.AreEqual (1, measure_called, "measure called 0");
Assert.AreEqual (new Size (0,0), c.DesiredSize);
Assert.AreEqual (new Size (0,0), parent.DesiredSize);
parent.Arrange (new Rect (0, 0, 100, 100));
Assert.AreEqual (1, arrange_called, "arrange called 1");
Assert.AreEqual (1, measure_called, "measure called 1");
c.InvalidateMeasure ();
c.InvalidateArrange ();
parent.InvalidateMeasure ();
parent.InvalidateArrange ();
parent.Arrange (new Rect (0, 0, 100, 100));
Assert.AreEqual (2, arrange_called, "arrange called 2");
Assert.AreEqual (2, measure_called, "measure called 2");
}
