/// <summary>
/// This method is calling when you press any mouse button within the workspace
/// </summary>
/// <param name="e"></param>
public void MouseDown(MouseEventArgs e)
{
GraphElement element;
//Looking for an item in the given position
if ((this.tempLayer.Elements.Count != 0) && (this.tempLayer.Elements[0].IntersectsWith(e.Location)))
{
element = this.tempLayer.Elements[0];
}
else
{
element = GraphDiagram.GetElement(this.diagramLayer, e.Location);
}
//Position is saved for future operations
this.downInitialPoint = e.Location;
//If an item exists, the mouse button is checked for a change of operation
if (element != null)
{
//If the button pressed is the left...
if (e.Button == MouseButtons.Left)
{
//If the press is on an arrow
if ((element is GraphArrow) && (this.tempLayer.Elements.Count == 1))
{
ArrowModifier modifier = ((GraphArrow)this.tempLayer.Elements[0]).GetModifier(e.Location);
if (modifier == null)
{
this.ClearOperationContext();
throw new OperationException(Operation.Nop, "Change to Select Operation");
}
else if (modifier is ConnectorModifier)
{
throw new OperationException(Operation.Nop, "Change to Reconnect Operation");
}
//If the press is on the element, it is passed to the selection operation
else
{
throw new OperationException(Operation.Nop, "Change to ModifyArrow Operation");
}
}
//If the pulsation is over a connector is passed to the arrow insert operation
else
if (element.IntersectsWithConnector(e.Location))
{
throw new OperationException(Operation.Nop, "Change to InsertArrow Operation");
}
//If the press is on the element, it is passed to the selection operation
else
{
this.ClearOperationContext();
throw new OperationException(Operation.Nop, "Change to Select Operation");
}
}
//If the button pressed is the left one, it is passed to the selection operation
else if (e.Button == MouseButtons.Right)
{
this.ClearOperationContext();
throw new OperationException(Operation.Nop, "Change to Select Operation");
}
}
}
/// <summary>
/// This method is called when the mouse moves into the workspace
/// </summary>
/// <param name="e"></param>
public void MouseMove(MouseEventArgs e)
{
if (this.tempLayer.Elements.Count != 0)
{
if (this.tempLayer.Elements[0].IntersectsWith(e.Location))
{
if (this.tempLayer.Elements[0] is GraphArrow)
{
ArrowModifier modifier = ((GraphArrow)this.tempLayer.Elements[0]).GetModifier(e.Location);
if (modifier is ConnectorModifier)
{
if ((Cursor.Current != Cursors.Hand) && (this.CursorChanged != null))
{
this.CursorChanged(this, new CursorEventArgs(Cursors.Hand));
}
}
else if (modifier is HorizontalModifier)
{
if ((Cursor.Current != Cursors.HSplit) && (this.CursorChanged != null))
{
this.CursorChanged(this, new CursorEventArgs(Cursors.HSplit));
}
}
else if (modifier is VerticalModifier)
{
if ((Cursor.Current != Cursors.VSplit) && (this.CursorChanged != null))
{
this.CursorChanged(this, new CursorEventArgs(Cursors.VSplit));
}
}
else
{
if ((Cursor.Current != Cursors.Default) && (this.CursorChanged != null))
{
this.CursorChanged(this, new CursorEventArgs(Cursors.Default));
}
}
}
else
if (this.tempLayer.Elements[0].IntersectsWithConnector(e.Location))
{
if ((Cursor.Current != Cursors.Hand) && (this.CursorChanged != null))
{
this.CursorChanged(this, new CursorEventArgs(Cursors.Hand));
}
}
else
if ((Cursor.Current != Cursors.Default) && (this.CursorChanged != null))
{
this.CursorChanged(this, new CursorEventArgs(Cursors.Default));
}
return;
}
}
//Looking for an item in the given position
GraphElement element = GraphDiagram.GetElement(this.diagramLayer, e.Location);
//If no items are found the operation is cancelled
if (element == null)
{
//If there is any element in the temporal layer, it removes
if (this.tempLayer.Elements.Count != 0)
{
this.ClearOperationContext();
//The temporary layer is updated
this.tempLayer.UpdateSurface();
//The cursor is updated a default
if ((Cursor.Current != Cursors.Default) && (this.CursorChanged != null))
{
this.CursorChanged(this, new CursorEventArgs(Cursors.Default));
}
}
//If the left button is pressed, the zone selection operation starts
if (e.Button == MouseButtons.Left)
{
throw new OperationException(Operation.Nop, "Change to SelectZone Operation");
}
}
else
{
if (this.tempLayer.Elements.Count == 0)
{
this.tempLayer.Visible = true;
}
else
{
//The temporary layer is cleaned
if (this.tempLayer.Elements[0] is GraphArrow)
{
//The arrow modifiers are disabled
((GraphArrow)this.tempLayer.Elements[0]).DisableModifiers();
}
else
{
//Disables connectors
((GraphElement)this.tempLayer.Elements[0]).DisableConnectors();
}
//Removes the element from the temporary layer
this.tempLayer.RemoveElement((GraphElement)this.tempLayer.Elements[0]);
}
if (element is GraphArrow)
{
((GraphArrow)element).EnableModifiers();
//Added to the temporary layer
this.tempLayer.AddElement(element);
this.tempLayer.UpdateSurface();
//Updates to the corresponding cursor
if ((Cursor.Current != Cursors.Default) && (this.CursorChanged != null))
{
this.CursorChanged(this, new CursorEventArgs(Cursors.Default));
}
}
else
{
//The following connectors are enabled
if (element.EnableNextConnectors())
{
//Added to the temporary layer
this.tempLayer.AddElement(element);
this.tempLayer.UpdateSurface();
//Updates to the corresponding cursor
if ((Cursor.Current != Cursors.Default) && (this.CursorChanged != null))
{
this.CursorChanged(this, new CursorEventArgs(Cursors.Default));
}
}
else
{
this.tempLayer.ClearAndHide();
this.tempLayer.UpdateSurface();
}
}
}
}
