/// <summary>
/// This constructor builds a new helpline object with given coordinates.
/// </summary>
/// <param name="host">The related control</param>
/// <param name="helpLine">Properties</param>
/// <param name="extender">Reference to editor component.</param>
internal HelpLineBehavior(IHtmlEditor host, HelpLineProperties helpLine, HelpLine extender) : base(host)
{
_host = host;
_host.ReadyStateComplete += new EventHandler(_host_ReadyStateComplete);
// store the instances to help the behavior to work on multiple extenders
instance = instanceCounter++;
this.extender = extender;
_snapToGrid = helpLine.SnapToGrid;
_snapgrid = helpLine.SnapGrid;
// assure a valid value, avoid Div by zero
if (_snapToGrid && _snapgrid == 0)
{
_snapgrid = 16;
}
snapZone = helpLine.SnapZone;
base.HtmlPaintFlag = HtmlPainter.Transparent;
base.HtmlZOrderFlag = HtmlZOrder.AboveContent;
_style = new Pen(helpLine.LineColor, (float)helpLine.LineWidth);
_lineVisible = helpLine.LineVisible;
_snapelements = helpLine.SnapElements;
_lineXEnabled = helpLine.LineXEnabled;
_lineYEnabled = helpLine.LineYEnabled;
_crossEnabled = helpLine.CrossEnabled;
this.x = helpLine.X;
this.y = helpLine.Y;
}
private HelpLineProperties EnsurePropertiesExists(IHtmlEditor key)
{
HelpLineProperties p = (HelpLineProperties)properties[key];
if (p == null)
{
p = new HelpLineProperties();
properties[key] = p;
}
return(p);
}
/// <summary>
/// Calculate the snap position based on the given properties.
/// </summary>
/// <param name="rect">Snap position.</param>
/// <param name="pVar">Zone control.</param>
/// <param name="properties">Read properties that influence the calculation.</param>
/// <param name="scrollPos">Current scroll position used to correct the snap's position.</param>
public static void SnapRectToHelpLine(ref System.Drawing.Rectangle rect, SnapZone pVar, HelpLineProperties properties, System.Drawing.Point scrollPos)
{
if (properties.SnapElements)
{
int x = properties.X + scrollPos.X;
int y = properties.Y + scrollPos.Y;
int snapzone = properties.SnapZone;
switch (pVar)
{
case SnapZone.None:
if (IsBetween(rect.Left, x - snapzone, x + snapzone))
{
rect.X = x;
}
if (IsBetween(rect.Right, x - snapzone, x + snapzone))
{
rect.X = (x - rect.Width);
}
if (IsBetween(rect.Top, y - snapzone, y + snapzone))
{
rect.Y = y;
}
if (IsBetween(rect.Bottom, y - snapzone, y + snapzone))
{
rect.Y = (y - rect.Height);
}
return;
case SnapZone.ZoneTop:
if (properties.SnapOnResize && IsBetween(rect.X, y - snapzone, y + snapzone))
{
rect.Y = properties.Y;
}
return;
case SnapZone.ZoneLeft:
if (properties.SnapOnResize && IsBetween(rect.Left, x - snapzone, x + snapzone))
{
rect.X = x;
}
return;
case SnapZone.ZoneBottom:
if (properties.SnapOnResize && IsBetween(rect.Bottom, y - snapzone, y + snapzone))
{
rect.Y = (y - rect.Height);
}
return;
case SnapZone.ZoneRight:
if (properties.SnapOnResize && IsBetween(rect.Right, x - snapzone, x + snapzone))
{
rect.X = (x - rect.Width);
}
return;
case SnapZone.CornerTopLeft:
if (properties.SnapOnResize && (IsBetween(rect.Top, y - snapzone, y + snapzone) || IsBetween(rect.Left, x - snapzone, x + snapzone)))
{
rect.Y = y;
rect.X = x;
}
return;
case SnapZone.CornerTopRight:
if (properties.SnapOnResize && (IsBetween(rect.Top, y - snapzone, y + snapzone) || IsBetween(rect.Right, x - snapzone, x + snapzone)))
{
rect.Y = y;
rect.X = (x - rect.Width);
}
return;
case SnapZone.CornerBottomLeft:
if (properties.SnapOnResize && (IsBetween(rect.Bottom, properties.Y - snapzone, y + snapzone) || IsBetween(rect.Left, x - snapzone, x + snapzone)))
{
rect.Y = (y - rect.Height);
rect.X = x;
}
return;
case SnapZone.CornerBottomRight:
if (properties.SnapOnResize && (IsBetween(rect.Bottom, y - snapzone, y + snapzone) || IsBetween(rect.Right, x - snapzone, x + snapzone)))
{
rect.Y = (y - rect.Height);
rect.X = (x - rect.Width);
}
return;
default:
return;
}
}
}
