private Selection CalculateStartAndEndOfSelection(string actualText, XmlCursor cursor)
{
var result = new Selection {
Start = -1, Length = 0
};
if (cursor.StartPos.ActualNode == this.XmlNode) // The start of the selection is on this node
{
switch (cursor.StartPos.PosOnNode)
{
case XmlCursorPositions.CursorOnNodeStartTag: // The node itself is selected as start node
case XmlCursorPositions.CursorOnNodeEndTag:
throw new ArgumentOutOfRangeException($"{nameof(cursor.StartPos.PosOnNode)}:{cursor.StartPos.PosOnNode.ToString()} not possible on a text node");
// result.Start = 0;
// result.Length = actualText.Length;
// break;
case XmlCursorPositions.CursorBehindTheNode:
case XmlCursorPositions.CursorInsideTheEmptyNode:
// Since the cursor position arrives sorted, the EndPos can only lie behind the node
result.Start = -1;
result.Length = 0;
break;
case XmlCursorPositions.CursorInFrontOfNode:
case XmlCursorPositions.CursorInsideTextNode:
if (cursor.StartPos.PosOnNode == XmlCursorPositions.CursorInsideTextNode)
{
result.Start = Math.Max(0, cursor.StartPos.PosInTextNode); // inside text node
}
else
{
result.Start = 0; // in front of the node
}
if (cursor.EndPos.ActualNode == this.XmlNode) // If the end of the selection also is inside this node
{
switch (cursor.EndPos.PosOnNode)
{
case XmlCursorPositions.CursorOnNodeStartTag: // start node is in front of the node, end node behind: everything is selected
case XmlCursorPositions.CursorOnNodeEndTag:
case XmlCursorPositions.CursorBehindTheNode:
result.Length = Math.Max(0, actualText.Length - result.Start);
break;
case XmlCursorPositions.CursorInsideTheEmptyNode:
result.Start = -1;
result.Length = 0;
break;
case XmlCursorPositions.CursorInsideTextNode: // till the marker in the text
result.Length = Math.Max(0, cursor.EndPos.PosInTextNode - result.Start);
break;
case XmlCursorPositions.CursorInFrontOfNode:
result.Length = 0;
break;
default:
throw new ApplicationException("unknown cursor.EndPos.PosOnNode '" + cursor.EndPos.PosOnNode + "'B");
}
}
else // The end of the selection is not inside this node
{
if (cursor.EndPos.ActualNode.ParentNode == cursor.StartPos.ActualNode.ParentNode) // If start and end are different, but directly in the same parent
{
result.Length = Math.Max(0, actualText.Length - result.Start); // Select only the selected part
}
else // Start and end are different and have different parents
{
result.Start = 0;
result.Length = actualText.Length; // select whole text node
}
}
break;
default:
throw new ApplicationException("unknown cursor.StartPos.PosOnNode '" + cursor.StartPos.PosOnNode + "'A");
}
}
else // The start of the selection is not on this node
{
if (cursor.EndPos.ActualNode == this.XmlNode) // But the end of the selection is
{
switch (cursor.EndPos.PosOnNode)
{
case XmlCursorPositions.CursorOnNodeStartTag: // The node itself is selected as End-Node
case XmlCursorPositions.CursorOnNodeEndTag: // start node is in front of the node, end node behind: everything is selected
case XmlCursorPositions.CursorBehindTheNode:
result.Start = 0;
result.Length = actualText.Length;
break;
case XmlCursorPositions.CursorInsideTheEmptyNode:
result.Start = -1;
result.Length = 0;
break;
case XmlCursorPositions.CursorInsideTextNode: // Start node is in front of the node, end node in the middle, so select from front to middle
if (cursor.EndPos.ActualNode.ParentNode == cursor.StartPos.ActualNode.ParentNode) // If start and end are different, but directly in the same parent
{
result.Start = 0;
result.Length = Math.Max(0, cursor.EndPos.PosInTextNode); // Select only the selected front part
}
else // Start and end different and different parents
{
result.Start = 0;
result.Length = actualText.Length; // select whole text node
}
break;
case XmlCursorPositions.CursorInFrontOfNode: // Start node is in front of the node, end node also
result.Start = -1;
result.Length = 0;
break;
default:
throw new ApplicationException("unknown cursor.EndPos.PosOnNode '" + cursor.EndPos.PosOnNode + "'X");
}
}
else // Neither the start nor the end of the selection lies exactly on this node
{
if (XmlCursorSelectionHelper.IsThisNodeInsideSelection(EditorState.CursorOptimized, this.XmlNode))
{
result.Start = 0;
result.Length = actualText.Length; // Select entire text node
}
}
}
return(result);
}
protected override async Task <PaintContext> PaintInternal(PaintContext paintContext, bool cursorBlinkOn, XmlCursor cursor, IGraphics gfx, PaintModes paintMode, int depth)
{
this.nodeDimensions.Update();
var isSelected = cursor?.StartPos != null && cursor?.EndPos != null && XmlCursorSelectionHelper.IsThisNodeInsideSelection(cursor, this.XmlNode);
this.CreateChildElementsIfNeeded(gfx);
Point newCursorPaintPos = null;
bool alreadyUnpainted = false;
switch (paintMode)
{
case PaintModes.ForcePaintNoUnPaintNeeded:
alreadyUnpainted = true;
break;
case PaintModes.ForcePaintAndUnpaintBefore:
this.UnPaint(gfx);
alreadyUnpainted = true;
break;
case PaintModes.OnlyPaintWhenChanged:
break;
}
// If the cursor is inside the empty node, then draw the cursor there
if (cursor.StartPos.ActualNode == this.XmlNode)
{
if (cursor.StartPos.PosOnNode == XmlCursorPositions.CursorInFrontOfNode)
{
// remember position for cursor line
newCursorPaintPos = new Point(paintContext.PaintPosX, paintContext.PaintPosY);
}
}
var cursorIsOnThisNode = cursor.StartPos.ActualNode == this.XmlNode || cursor.EndPos.ActualNode == this.XmlNode;
paintContext = await this.startTag.Paint(paintContext, cursorIsOnThisNode, cursorBlinkOn, alreadyUnpainted, isSelected, gfx);
// If the cursor is inside the empty node, then draw the cursor there
if (cursor.StartPos.ActualNode == this.XmlNode)
{
if (cursor.StartPos.PosOnNode == XmlCursorPositions.CursorInsideTheEmptyNode)
{
// set position for cursor line
newCursorPaintPos = new Point(paintContext.PaintPosX - 1, paintContext.PaintPosY);
}
}
paintContext = await this.PaintSubNodes(paintContext, cursorBlinkOn, cursor, gfx, paintMode, depth);
if (this.endTag != null)
{
paintContext = await this.endTag.Paint(paintContext, cursorIsOnThisNode, cursorBlinkOn, alreadyUnpainted, isSelected, gfx);
}
// If the cursor is behind the node, then also draw the cursor there
if (cursor.StartPos.ActualNode == this.XmlNode)
{
if (cursor.StartPos.PosOnNode == XmlCursorPositions.CursorBehindTheNode)
{
newCursorPaintPos = new Point(paintContext.PaintPosX - 1, paintContext.PaintPosY);
}
}
this.cursorPaintPos = newCursorPaintPos;
return(paintContext.Clone());
}