/* Handle mouse move moving an Entity around with the right button.
* and the highlighting process
*/
private void Form1_MouseMove(object sender, MouseEventArgs e)
{
// if it is over an entity
var tempEnt = myChart.FindEntity(e.Location);
highlightedEntity = (Entity)ProcessHighLighting(tempEnt, highlightedEntity);
// if it is over an attribute
var tempAttribute = tempEnt?.FindAttribute(e.Location);
highlightedAttribute = (Attribute)ProcessHighLighting(tempAttribute, highlightedAttribute);
//if it is over a link
var tempLink = myChart.FindLink(e.Location);
highlightedLink = (Link)ProcessHighLighting(tempLink, highlightedLink);
// moving an entity
if (mousePoint != Point.Empty)
{
MouseMoveObject(movedEntity, e.Location);
}
// repaint
Invalidate(true);
}
// if the attribute is dropped in the backgorund then is removed
// if dropped on an entity that does not have it then
// is added in the position of the mouse
private void frmMain_DragDrop(object sender, DragEventArgs e)
{
var draggedAttribute = (Attribute)e.Data.GetData(typeof(Attribute));
var dropPoint = PointToClient(new Point(e.X, e.Y));
var tempEntity = myChart.FindEntity(dropPoint);
if (tempEntity == null)
{
selectedEntity.RemoveAttribute(draggedAttribute);
myChart.DestroyLinks();
return;
}
// if in the same entity the reorder both attributes
var tempAttribute = tempEntity.FindAttribute(dropPoint);
if (selectedEntity == tempEntity)
{
selectedEntity.ReorderAttribute(draggedAttribute, tempAttribute);
}
else
{ // if different entities inset att and create a new default link (OnetoOne)
var copiedAttrributed = new Attribute(draggedAttribute);
tempEntity.AddAttributeAfter(copiedAttrributed, tempAttribute);
myChart.AddLink(new Link(draggedAttribute, copiedAttrributed, Relationship.One2One));
}
Invalidate(true);
}
private void Form1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Right)
{
// clicked on an entity
movedEntity = myChart.FindEntity(e.Location);
mousePoint = movedEntity != null ? e.Location : Point.Empty;
}
else if (e.Button == MouseButtons.Left)
{
mouseSelected = e.Location;
// clicked on an entity
var tempEntity = myChart.FindEntity(mouseSelected);
selectedEntity = (Entity)ProcessSelection(tempEntity, selectedEntity);
bs.Position = myChart.FindEntityPosition(selectedEntity);
// clicked on a link
var tempLink = myChart.FindLink(e.Location);
selectedLink = (Link)ProcessSelection(tempLink, selectedLink);
stbLink.Enabled = selectedLink != null;
// clicked on an attribute
var tempAttribute = selectedEntity?.FindAttribute(e.Location);
selectedAttribute = (Attribute)ProcessSelection(tempAttribute, selectedAttribute);
if (selectedAttribute != null)
{
DoDragDrop(selectedAttribute, DragDropEffects.Copy | DragDropEffects.Move);
}
// clicked on an empty space = background
if ((tempLink == null) && (tempAttribute == null) && (selectedEntity == null))
{
DoDragDrop(DragDropObject, DragDropEffects.Copy);
}
UpdateStatusBar();
}
Invalidate(true);
}
