private void ScrollAnnotation(DiagramScrollBar scrollBar)
{
Point delta = Delta;
var annotationData = m_annotationEditors[scrollBar.Item.Cast<IAnnotation>()];
float lineHeight = annotationData.TextLayout.Height /annotationData.TextLayout.LineCount;
float lines = delta.Y / lineHeight;
int newTopLine = m_startTopLine + (int)lines;
float visibleLines = annotationData.TextLayout.LayoutHeight / lineHeight;
if (newTopLine < 0)
newTopLine = 0;
if (newTopLine + visibleLines - 1 > annotationData.TextLayout.LineCount)
newTopLine = annotationData.TopLine;
annotationData.TopLine = newTopLine >=0? newTopLine:0;
}
/// <summary>
/// Constructor, annotation hit</summary>
/// <param name="annotation">Annotation item</param>
/// <param name="scrollBar">Specifies a hit on an item's scroll bar part</param>
public AnnotationHitEventArgs(IAnnotation annotation, DiagramScrollBar scrollBar)
{
Item = annotation;
Part = scrollBar;
}
private void ScrollAnnotation(DiagramScrollBar scrollBar)
{
if (scrollBar == null)
return;
var annotation = scrollBar.Item.Cast<IAnnotation>();
Point delta = Delta;
var annotationData = m_annotationEditors[annotation];
float lineHeight = annotationData.TextLayout.Height /annotationData.TextLayout.LineCount;
float lines = delta.Y / lineHeight;
int newTopLine = m_startTopLine + (int)Math.Ceiling(lines);
float visibleLines = annotationData.TextLayout.LayoutHeight / lineHeight;
if (newTopLine < 0)
newTopLine = 0;
if ((int)(newTopLine + visibleLines - 1) > annotationData.TextLayout.LineCount)
newTopLine = annotationData.TopLine;
annotationData.TopLine = newTopLine >=0 ? newTopLine:0;
annotationData.ResetText(annotation.Text);
}
