/// <summary>
/// Updates the list control based on the given property change.
/// Updates the list of possible items based on the values provided by the property
/// and inserts a blank item for a drop down list if the property is editable and not required.
/// </summary>
/// <param name="change">The property change.</param>
protected override void UpdateElement(PropertyChange change)
{
// let the base handle everything except value change
base.UpdateElement(change - PropertyChange.Value);
ListControl list = control as ListControl;
if (property == null || list == null)
{
return;
}
object val = property.InternalValue;
IList lst = val == null ? new ArrayList() : val as IList;
ListBox lb = control as ListBox;
bool isMultiVal = lst != null && (control is CheckBoxList ||
lb != null && lb.SelectionMode == ListSelectionMode.Multiple);
DropDownList dl = control as DropDownList;
if (change.IncludesItems() || // if items list changed,
isMultiVal && change.IncludesEditable() || // or control shows all items and Editable changed,
dl != null && change.IncludesRequired() || // or control is DropDownList and Required changed,
change.IncludesValue()) // or property value changed
{
// get the list of items to show
IEnumerable src = null;
if (isMultiVal && !property.Editable)
{
src = lst;
}
else if (property.ItemsProvider != null)
{
src = property.ItemsProvider(null);
}
list.Items.Clear(); // clear control's item collection
// for DropDownList, add special items in case when not Required or Required and has no value
if (dl != null && !property.Required)
{
list.Items.Add(new ListItem("", property.NullString));
}
if (dl != null && property.Required && property.IsNull())
{
list.Items.Add(new ListItem("Select Value...", ""));
}
int insertionPoint = list.Items.Count;
// add items to show
if (src != null)
{
foreach (object i in src)
{
ListItem li = new ListItem(property.ValueToString(i, ValueFormat.DisplayString),
property.ValueToString(i, ValueFormat.EditString));
list.Items.Add(li);
li.Selected = src == lst; // if items are values, mark them as selected
}
}
// if not showing only values, make sure the values are present in the list and mark them as selected
if (src != lst)
{
IEnumerable values = isMultiVal ? lst : new object[] { (lst != null && lst.Count > 0) ? lst[0] : property.InternalValue };
foreach (object i in values)
{
ListItem li = list.Items.FindByValue(property.ValueToString(i, ValueFormat.EditString));
if (li == null) // add values not in list
{
li = new ListItem(property.ValueToString(i, ValueFormat.DisplayString),
property.ValueToString(i, ValueFormat.EditString));
li.Attributes["disabled"] = "disabled";; // disable items not included in the list of expected values
list.Items.Insert(insertionPoint++, li); // insert them after special items and before expected values
}
li.Selected = true;
}
}
}
}
/// <summary>
/// Updates the selector based on the given property change.
/// Updates the list of possible items based on the values provided by the property
/// and inserts a blank item for a combo box if the property is editable and not required.
/// </summary>
/// <param name="change">The property change.</param>
protected override void UpdateElement(PropertyChange change)
{
base.UpdateElement(change);
Selector sel = element as Selector;
if (property == null || sel == null) return;
object val = property.InternalValue;
IList lst = val as IList;
ListBox lb = element as ListBox;
ComboBox cb = element as ComboBox;
if (change.IncludesItems() ||
lb != null && change.IncludesEditable() ||
cb != null && change.IncludesRequired())
{
sel.Items.Clear();
IEnumerable src = null;
if (lb != null && !property.Editable && lst != null) src = lst;
else if (property.ItemsProvider != null) src = property.ItemsProvider(null);
// for non-required drop down lists add null string option
if (cb != null && !cb.IsEditable && !property.Required)
sel.Items.Add(property.NullString);
// add items explicitly. Don't use sel.ItemSource since src is not observable
if (src != null) foreach (object item in src) sel.Items.Add(item);
}
if (change.IncludesValue() || change.IncludesItems())
{
if (lb != null && lst != null && lb.SelectionMode != SelectionMode.Single)
{
lb.SelectedItems.Clear();
foreach (object item in lst) lb.SelectedItems.Add(item);
}
else if (lst != null && lst.Count > 0) sel.SelectedItem = lst[0];
else sel.SelectedItem = val;
if (cb != null && cb.IsEditable) cb.Text = property.EditStringValue;
}
}
/// <summary>
/// Updates the list control based on the given property change.
/// Updates the list of possible items based on the values provided by the property
/// and inserts a blank item for a drop down list if the property is editable and not required.
/// </summary>
/// <param name="change">The property change.</param>
protected override void UpdateElement(PropertyChange change)
{
// let the base handle everything except value change
base.UpdateElement(change - PropertyChange.Value);
ListControl list = control as ListControl;
if (property == null || list == null) return;
object val = property.InternalValue;
IList lst = val == null ? new ArrayList() : val as IList;
ListBox lb = control as ListBox;
bool isMultiVal = lst != null && (control is CheckBoxList
|| lb != null && lb.SelectionMode == ListSelectionMode.Multiple);
DropDownList dl = control as DropDownList;
if (change.IncludesItems() // if items list changed,
|| isMultiVal && change.IncludesEditable() // or control shows all items and Editable changed,
|| dl != null && change.IncludesRequired() // or control is DropDownList and Required changed,
|| change.IncludesValue()) // or property value changed
{
// get the list of items to show
IEnumerable src = null;
if (isMultiVal && !property.Editable) src = lst;
else if (property.ItemsProvider != null) src = property.ItemsProvider(null);
list.Items.Clear(); // clear control's item collection
// for DropDownList, add special items in case when not Required or Required and has no value
if (dl != null && !property.Required)
list.Items.Add(new ListItem("", property.NullString));
if (dl != null && property.Required && property.IsNull())
list.Items.Add(new ListItem("Select Value...", ""));
int insertionPoint = list.Items.Count;
// add items to show
if (src != null)
{
foreach (object i in src)
{
ListItem li = new ListItem(property.ValueToString(i, ValueFormat.DisplayString),
property.ValueToString(i, ValueFormat.EditString));
list.Items.Add(li);
li.Selected = src == lst; // if items are values, mark them as selected
}
}
// if not showing only values, make sure the values are present in the list and mark them as selected
if (src != lst)
{
IEnumerable values = isMultiVal ? lst : new object[] { (lst != null && lst.Count > 0) ? lst[0] : property.InternalValue };
foreach (object i in values)
{
ListItem li = list.Items.FindByValue(property.ValueToString(i, ValueFormat.EditString));
if (li == null) // add values not in list
{
li = new ListItem(property.ValueToString(i, ValueFormat.DisplayString),
property.ValueToString(i, ValueFormat.EditString));
li.Attributes["disabled"] = "disabled"; ; // disable items not included in the list of expected values
list.Items.Insert(insertionPoint++, li); // insert them after special items and before expected values
}
li.Selected = true;
}
}
}
}
/// <summary>
/// Updates the selector based on the given property change.
/// Updates the list of possible items based on the values provided by the property
/// and inserts a blank item for a combo box if the property is editable and not required.
/// </summary>
/// <param name="change">The property change.</param>
protected override void UpdateElement(PropertyChange change)
{
base.UpdateElement(change);
Selector sel = element as Selector;
if (property == null || sel == null)
{
return;
}
object val = property.InternalValue;
IList lst = val as IList;
ListBox lb = element as ListBox;
ComboBox cb = element as ComboBox;
if (change.IncludesItems() ||
lb != null && change.IncludesEditable() ||
cb != null && change.IncludesRequired())
{
sel.Items.Clear();
IEnumerable src = null;
if (lb != null && !property.Editable && lst != null)
{
src = lst;
}
else if (property.ItemsProvider != null)
{
src = property.ItemsProvider(null);
}
// for non-required drop down lists add null string option
if (cb != null && !cb.IsEditable && !property.Required)
{
sel.Items.Add(property.NullString);
}
// add items explicitly. Don't use sel.ItemSource since src is not observable
if (src != null)
{
foreach (object item in src)
{
sel.Items.Add(item);
}
}
}
if (change.IncludesValue() || change.IncludesItems())
{
if (lb != null && lst != null && lb.SelectionMode != SelectionMode.Single)
{
lb.SelectedItems.Clear();
foreach (object item in lst)
{
lb.SelectedItems.Add(item);
}
}
else if (lst != null && lst.Count > 0)
{
sel.SelectedItem = lst[0];
}
else
{
sel.SelectedItem = val;
}
if (cb != null && cb.IsEditable)
{
cb.Text = property.EditStringValue;
}
}
}