protected override void OnPropertyChanged(LimeProperty prop, PropertyChangedEventArgs e)
{
if (string.IsNullOrEmpty(e.PropertyName) || e.PropertyName == "Content")
{
LimeMsg.Debug("LimeListView OnPropertyChanged: {0} : {1} : {2}", prop, prop?.Ident, e?.PropertyName);
int idx = 0;
// Bellow we try to re-use the existing controls to avoid rendering overhead
if (prop != null)
{
LimePropertyCollection collec;
if (typeof(LimePropertyCollection).IsAssignableFrom(prop.Type))
{
collec = (LimePropertyCollection)prop.Content;
}
else
{
collec = new LimePropertyCollection(null, prop);
}
for (int i = 0; i < collec.Count; i++)
{
var sprop = collec[i];
LimeControl wxctrl = null;
var type = LimeControlSelector(sprop);
if (type == null)
{
continue;
}
if (idx < wxMain.Items.Count)
{
var wxitem = (LimeControl)wxMain.Items[idx];
var propitem = (LimeProperty)wxitem.DataContext;
if (type == wxitem.GetType())
{
LimeMsg.Debug("LimeListView OnPropertyChanged: recycle {0} : {1} --> {2}", idx, propitem, sprop);
wxitem.DataContext = sprop;
wxitem.Visibility = sprop?.Visible == true ? Visibility.Visible : Visibility.Collapsed;
}
else
{
LimeMsg.Debug("LimeListView OnPropertyChanged: replaced {0} : {1} --> {2}", idx, propitem, sprop);
wxMain.Items[idx] = wxctrl = (LimeControl)Activator.CreateInstance(type);
}
}
else
{
LimeMsg.Debug("LimeListView OnPropertyChanged: new {0} : {1}", idx, sprop);
wxMain.Items.Add(wxctrl = (LimeControl)Activator.CreateInstance(type));
}
if (wxctrl != null)
{
wxctrl.IsTabStop = false;
wxctrl.Level = Level > 0.11 ? Level - 0.1 : Level;
wxctrl.ReadOnly = ReadOnly;
wxctrl.HeaderEnabled = HeaderEnabled;
wxctrl.ValidateOnChange = ValidateOnChange;
wxctrl.DataContext = sprop;
}
idx++;
}
}
// Hide remaining items from previous bindings
for (; idx < wxMain.Items.Count; idx++)
{
var wxitem = (LimeControl)wxMain.Items[idx];
wxitem.DataContext = null;
wxitem.Visibility = Visibility.Collapsed;
}
}
}
private static void OnBoundDataContextChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var wxThis = d as LimeControl;
var isLimeControl = wxThis != null && wxThis.GetType() == typeof(LimeControl);
//LimeMsg.Debug("LimeControl OnBoundDataContextChanged: {0}", e.NewValue);
if (e.OldValue is LimeProperty old)
{
old.PropertyChangedWeak -= wxThis.TriggerDataContextChanged;
}
var prop = e.NewValue as LimeProperty;
var content = prop != null ? prop.Content : e.NewValue;
// Unpack from Matryoshka
if (content is IMatryoshka matr)
{
// Find the most inner matryoshka object
while (matr.Content is IMatryoshka sub)
{
matr = sub;
}
content = matr.Content;
// Repack into a LimeProperty
if (prop != null)
{
prop = new LimeProperty(null, matr, "Content", prop);
}
else
{
prop = new LimeProperty(null, matr, "Content");
}
}
// Encapsulate into LimeProperty
if (prop == null && content != null)
{
prop = new LimeProperty(null, content);
e = new DependencyPropertyChangedEventArgs(e.Property, e.OldValue, prop);
}
// Select the right LimeControl sub-class depending on the Type of the LimeProperty
LimeControl wxbind = wxThis;
if (isLimeControl)
{
#if DEBUG
wxThis.ADebug = prop != null?string.Format("{1} [{0}] (base)", prop.Type, prop.Ident ?? prop.Name) : "null (base)";
#endif
// Type dispatcher
var type = LimeControlSelector(prop);
LimeControl wxobj = null;
if (type == null)
{
// do nothing
}
else if (type != wxThis.Content?.GetType())
{
wxobj = (LimeControl)Activator.CreateInstance(type);
wxobj.Base = wxThis;
}
else
{
wxobj = (LimeControl)wxThis.Content;
}
wxThis.Content = wxbind = wxobj;
#if DEBUG
if (wxobj != null)
{
wxobj.ADebug = prop != null?string.Format("{1} [{0}] (content)", prop.Type, prop.Ident ?? prop.Name) : "null (content)";
}
#endif
}
// Bind property to this Control (or content)
if (prop != null)
{
prop.PropertyChangedWeak += wxbind.TriggerDataContextChanged;
}
if (wxThis != null && wxThis.Content is FrameworkElement wxcont)
{
wxcont.DataContext = prop;
}
// Event trigger
wxbind?.OnBoundDataContextChanged(e);
if (!isLimeControl && wxbind != null)
{
// Trigger Binding initialization
wxbind.TriggerDataContextChanged(prop, new PropertyChangedEventArgs(null));
}
}