protected override Widget GetElementWidget(T obj)
{
Cell cell;
cell = new Cell(context, obj);
if (editable)
{
MyDragDrop.SetFailAction(cell, delegate {
parent.Remove(obj);
DependencyManager.TriggerAllFlags();
});
MyDragDrop.SetFailAction(cell.frame.LabelWidget, delegate {
parent.Remove(obj);
DependencyManager.TriggerAllFlags();
});
}
// Rationale for removing only if drag had no target ("fails")
// - If cellObject is dragged from an aggregative list to another aggregative list,
// the Add() function on the second automatically removes it from the first, so calling Remove() is unnecessary.
// - If cellObject is dragged from an associative list to an aggregative list or vice versa,
// We reasonably assume that user doesn't want it removed from the first list since the concept of "moving" doesn't apply in this context.
// - Only if the user has dragged cellObject from any list to *nothing* can it be assumed that they need it manually removed by us.
return(cell);
}
public override Widget GetCellContents(Context context)
{
bool editable = UIFactory.EditAuthorized(this, "structures");
//Creates the cell contents
VBox structureBox = new VBox(false, 0)
{
BorderWidth = 3
};
foreach (Structure structure in structures)
{
InspectableBox header = (InspectableBox)structure.GetHeader(context.butInUIContext(this));
if (editable)
{
MyDragDrop.SetFailAction(header, delegate {
Remove(structure);
DependencyManager.TriggerAllFlags();
});
}
structureBox.PackStart(header, false, false, 0);
}
if (editable)
{
//Set up dropping
EventBox eventBox = new EventBox {
Child = structureBox, VisibleWindow = false
};
MyDragDrop.DestSet(eventBox, "Structure");
MyDragDrop.DestSetDropAction(eventBox, delegate {
if (Accepts(MyDragDrop.currentDragged))
{
Add(MyDragDrop.currentDragged);
DependencyManager.TriggerAllFlags();
}
});
return(new Gtk.Alignment(0, 0, 1, 0)
{
Child = eventBox, BorderWidth = 7
});
}
else
{
structureBox.BorderWidth += 7;
return(structureBox);
}
//For some reason drag/drop highlights include BorderWidth.
//The Alignment makes the highlight actually appear at the 3:7 point in the margin.
}