namespace Crow
{
[DefaultTemplate("#Crow.Templates.ListBox.goml")]
- //[DefaultTemplate("#Crow.Templates.ItemTemplate.goml")]
- public class ListBox : TemplatedControl//, IXmlSerializable
+ public class ListBox : TemplatedControl
{
#region CTOR
public ListBox () : base() {}
#endregion
+ #region events
+ public event EventHandler<SelectionChangeEventArgs> SelectedItemChanged;
+ #endregion
+
Group _list;
GenericStack _gsList;
IList data;
int _selectedIndex;
string _itemTemplate;
+ int itemPerPage = 100;
+ MemoryStream templateStream = null;
+ Type templateBaseType = null;
+ Thread loadingThread = null;
+ volatile bool cancelLoading = false;
- public event EventHandler<SelectionChangeEventArgs> SelectedItemChanged;
+ [XmlAttributeAttribute]public IList Data {
+ get {
+ return data;
+ }
+ set {
+ if (value == data)
+ return;
+
+ cancelLoadingThread ();
- #region implemented abstract members of TemplatedControl
- protected override void loadTemplate (GraphicObject template = null)
- {
- base.loadTemplate (template);
- _list = this.child.FindByName ("List") as Group;
- if (_list == null)
- throw new Exception ("ListBox Template MUST contain a Goup named 'List'.");
- _gsList = _list as GenericStack;
- }
+ data = value;
+ NotifyValueChanged ("Data", data);
- #endregion
+ _list.ClearChildren ();
+ if (_gsList.Orientation == Orientation.Horizontal)
+ _gsList.Width = -1;
+ else
+ _gsList.Height = -1;
+ if (data == null)
+ return;
+
+ loadingThread = new Thread (loading);
+ loadingThread.IsBackground = true;
+ loadingThread.Start ();
+ //loadPage(1);
+
+ NotifyValueChanged ("SelectedIndex", _selectedIndex);
+ NotifyValueChanged ("SelectedItem", SelectedItem);
+ SelectedItemChanged.Raise (this, new SelectionChangeEventArgs (SelectedItem));
+ }
+ }
[XmlAttributeAttribute][DefaultValue("#Crow.Templates.ItemTemplate.goml")]
public string ItemTemplate {
get { return _itemTemplate; }
NotifyValueChanged("ItemTemplate", _itemTemplate);
}
}
- [XmlAttributeAttribute][DefaultValue(-1)]
- public int SelectedIndex{
+ [XmlAttributeAttribute][DefaultValue(-1)]public int SelectedIndex{
get { return _selectedIndex; }
set {
if (value == _selectedIndex)
return;
-
+
_selectedIndex = value;
NotifyValueChanged ("SelectedIndex", _selectedIndex);
SelectedItemChanged.Raise (this, new SelectionChangeEventArgs (SelectedItem));
}
}
- public object SelectedItem{
+ [XmlIgnore]public object SelectedItem{
get { return data == null ? null : _selectedIndex < 0 ? null : data[_selectedIndex]; }
}
- [XmlAttributeAttribute]//[DefaultValue(null)]
- public IList Data {
- get {
- return data;
- }
- set {
- if (value == data)
- return;
-
- data = value;
-
- NotifyValueChanged ("Data", data);
-
- _list.ClearChildren ();
- if (_gsList.Orientation == Orientation.Horizontal)
- _gsList.Width = -1;
- else
- _gsList.Height = -1;
-
- if (data == null)
- return;
-
- loadPage (1);
-
- NotifyValueChanged ("SelectedIndex", _selectedIndex);
- NotifyValueChanged ("SelectedItem", SelectedItem);
- SelectedItemChanged.Raise (this, new SelectionChangeEventArgs (SelectedItem));
- }
+
+ #region implemented abstract members of TemplatedControl
+ protected override void loadTemplate (GraphicObject template = null)
+ {
+ base.loadTemplate (template);
+ _list = this.child.FindByName ("List") as Group;
+ if (_list == null)
+ throw new Exception ("ListBox Template MUST contain a Goup widget named 'List'.");
+ _gsList = _list as GenericStack;
+ }
+ #endregion
+ void loading(){
+ for (int i = 1; i <= (data.Count / itemPerPage)+1; i++)
+ loadPage (i);
+ }
+ void cancelLoadingThread(){
+ if (loadingThread == null)
+ return;
+ if (!loadingThread.IsAlive)
+ return;
+ cancelLoading = true;
+ loadingThread.Join ();
+ cancelLoading = false;
}
- int itemPerPage = 50;
- MemoryStream templateStream = null;
- Type templateBaseType = null;
-
void loadPage(int pageNum)
{
#if DEBUG_LOAD
templateBaseType = Interface.GetTopContainerOfXMLStream (templateStream);
}
- lock (Interface.CurrentInterface.UpdateMutex) {
-
- Group page = _list.Clone () as Group;
- page.Name = "page" + pageNum;
- //page.Background = Color.Green;
+ Group page = _list.Clone () as Group;
+
+ page.Name = "page" + pageNum;
- //reset size to fit in the dir of the stacking
- //because _list total size is forced to approx size
- if (_gsList.Orientation == Orientation.Horizontal) {
- page.Width = -1;
- } else {
- page.Height = -1;
-// Bindings.Add(new Binding
-// (new MemberReference (page, typeof(GraphicObject).GetMember ("Width")[0]), "../../WidthPolicy"));
- //page.Bindings.Add(new Binding (page, "Width", "../../WidthPolicy"));
- page.BindMember("Width", "../WidthPolicy");
- }
+ //reset size to fit in the dir of the stacking
+ //because _list total size is forced to approx size
+ if (_gsList.Orientation == Orientation.Horizontal) {
+ page.Width = Measure.Fit;
+ page.BindMember ("Height", "../HeightPolicy");
+ } else {
+ page.Height = Measure.Fit;
+ page.BindMember ("Width", "../WidthPolicy");
+ }
- for (int i = (pageNum - 1) * itemPerPage; i < pageNum * itemPerPage; i++) {
- if (i >= data.Count)
- break;
- templateStream.Seek (0, SeekOrigin.Begin);
- GraphicObject g = Interface.Load (templateStream, templateBaseType);
- g.MouseClick += itemClick;
+ for (int i = (pageNum - 1) * itemPerPage; i < pageNum * itemPerPage; i++) {
+ if (i >= data.Count)
+ break;
+ if (cancelLoading == true)
+ return;
+ templateStream.Seek (0, SeekOrigin.Begin);
+ GraphicObject g = Interface.Load (templateStream, templateBaseType);
+ g.MouseClick += itemClick;
+
+ lock (Interface.CurrentInterface.UpdateMutex)
page.AddChild (g);
- g.DataSource = data [i];
- //g.LogicalParent = this;
- }
+ g.DataSource = data [i];
+ //g.LogicalParent = this;
+ }
+ lock (Interface.CurrentInterface.UpdateMutex)
_list.AddChild (page);
- }
+
#if DEBUG_LOAD
loadingTime.Stop ();
Debug.WriteLine("Listbox {2} Loading: {0} ticks \t, {1} ms",
loadingTime.ElapsedMilliseconds, this.ToString());
#endif
}
- protected void _scroller_ValueChanged (object sender, ValueChangeEventArgs e)
- {
- if (_gsList == null)
- return;
- if (data == null)
- return;
- if (data.Count <= itemPerPage)
- return;
-
- if (_gsList.Orientation == Orientation.Horizontal) {
- } else {
- if (!string.Equals (e.MemberName, "ScrollY"))
- return;
-
- double scroll = (double)e.NewValue;
- int pageHeight = (int)Math.Ceiling((double)_gsList.getSlot().Height / (double)data.Count * (double)itemPerPage);
- int pagePtr = (int)Math.Ceiling((scroll + (double)pageHeight / 2.0) / (double)pageHeight);
-
- for (int i = _gsList.Children.Count+1; i < pagePtr+1; i++) {
- loadPage (i);
- }
- }
- }
protected void _list_LayoutChanged (object sender, LayoutingEventArgs e)
{
#if DEBUG_LAYOUTING
return -1;
GenericStack page1 = _list.FindByName ("page1") as GenericStack;
if (page1 == null)
- return - 1;
+ return -1;
return page1.Orientation == Orientation.Horizontal ?
data.Count < itemPerPage ?
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