/// <summary>
/// Calculates bounds of the selection area used for selection overlay drag operation, depending on drag starting
/// point coordinates and current drag coordinates.
/// </summary>
/// <returns>Bounds of the selection area, relative to the content scroll area.</returns>
private Rect2I CalculateSelectionArea()
{
Rect2I selectionArea = new Rect2I();
if (dragSelectionStart.x < dragSelectionEnd.x)
{
selectionArea.x = dragSelectionStart.x;
selectionArea.width = dragSelectionEnd.x - dragSelectionStart.x;
}
else
{
selectionArea.x = dragSelectionEnd.x;
selectionArea.width = dragSelectionStart.x - dragSelectionEnd.x;
}
if (dragSelectionStart.y < dragSelectionEnd.y)
{
selectionArea.y = dragSelectionStart.y;
selectionArea.height = dragSelectionEnd.y - dragSelectionStart.y;
}
else
{
selectionArea.y = dragSelectionEnd.y;
selectionArea.height = dragSelectionStart.y - dragSelectionEnd.y;
}
Rect2I maxBounds = contentScrollArea.Layout.Bounds;
maxBounds.x = 0;
maxBounds.y = 0;
selectionArea.Clip(maxBounds);
return selectionArea;
}