protected override void OnRender(DrawingContext drawingContext)
{
if (double.IsNaN(ActualWidth) || double.IsNaN(ActualHeight))
{
return;
}
if (!isRenderingNeeded && oldActualWidth == ActualWidth && oldActualHeight == ActualHeight)
{
return;
}
//Size has changed. Recreate all Visuals
oldActualWidth = ActualWidth;
oldActualHeight = ActualHeight;
isRenderingNeeded = false;
Visuals.Clear();
Visuals.Add(crerateBackGroundVisual());
foreach (Renderer renderer in renderers)
{
//////var xGridLineRenderer = renderer as XGridLineRenderer;
//////if (xGridLineRenderer!=null) {
////// if (double.IsNaN(xGridLineRenderer.MinDisplayValueY) || double.IsNaN(xGridLineRenderer.MaxDisplayValueY)){
////// xGridLineRenderer.SetDisplayValueRangeY(xGridLineRenderer.YLegendScroller.MinDisplayValue, xGridLineRenderer.YLegendScroller.MaxDisplayValue);
////// }
//////}
Visuals.Add(renderer.CreateVisual(ActualWidth, ActualHeight));
}
TraceWpf.Line("PlotArea.OnRender: " + renderers.Count + " Renderer Visuals recreated");
}
/// <inheritdoc/>
protected override Size MeasureCore(Size constraint)
{
// Remove all visual children
Visuals.Clear();
// Measure the visible lines, starting at the first visible line from the scroll position
double ypos = 0.0, xwidth = 0.0;
var partial_offset = (double?)null;
var ofs = TextView.ScrollOffset;
for (var doc_line = TextView.FirstVisibleLine(ofs.Y); doc_line != null; doc_line = doc_line.NextLine)
{
// Get/Create the visual line
var vis_line = TextView.VisualLine(doc_line);
vis_line.EnsureTextLines(constraint);
vis_line.YPos = ofs.Y + ypos;
// Record the partial offset of the first line
partial_offset ??= vis_line.YPos - ofs.Y; // todo
// Record the width of the line
xwidth = Math.Max(xwidth, vis_line.LineWidth);
// Increment the y position by the line height
ypos += vis_line.LineHeight;
// Add the line as a visual child of the view
Visuals.Add(vis_line.Graphics);
}
InvalidateArrange();
// Record the partial line offset
PartialLineOffset = partial_offset ?? 0.0;
// Grow the document area a bit
const bool AllowScrollBelowDocument = false; //todo: option
xwidth += AdditionalHorizontalScrollAmount;
ypos += AllowScrollBelowDocument && !double.IsInfinity(constraint.Height) ? Math.Min(0, constraint.Height - TextView.DefaultLineHeight) : 0.0;
// Return the desired size
return(new Size(
Math.Min(constraint.Width, xwidth),
Math.Min(constraint.Height, ypos)));
}