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//
// ListBox.cs
//
// Author:
// Jean-Philippe Bruyère <jp.bruyere@hotmail.com>
//
// Copyright (c) 2015 jp
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
using System;
using System.Collections;
using System.Xml.Serialization;
using System.ComponentModel;
using System.IO;
using System.Diagnostics;
using System.Xml;
using System.Collections.Generic;
using System.Threading;
namespace Crow
{
[DefaultTemplate("#Crow.Templates.ListBox.goml")]
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;
int itemPerPage = 50;
Thread loadingThread = null;
volatile bool cancelLoading = false;
[XmlAttributeAttribute]public IList Data {
get {
return data;
}
set {
if (value == data)
return;
cancelLoadingThread ();
data = value;
NotifyValueChanged ("Data", data);
lock (Interface.CurrentInterface.UpdateMutex)
_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(-1)]public int SelectedIndex{
get { return _selectedIndex; }
set {
if (value == _selectedIndex)
return;
_selectedIndex = value;
NotifyValueChanged ("SelectedIndex", _selectedIndex);
NotifyValueChanged ("SelectedItem", SelectedItem);
SelectedItemChanged.Raise (this, new SelectionChangeEventArgs (SelectedItem));
}
}
[XmlIgnore]public virtual object SelectedItem{
get { return data == null ? null : _selectedIndex < 0 ? null : data[_selectedIndex]; }
}
protected void raiseSelectedItemChanged(){
SelectedItemChanged.Raise (this, new SelectionChangeEventArgs (SelectedItem));
}
#region TemplatedControl override
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(){
if (ItemTemplates == null)
ItemTemplates = new Dictionary<string, ItemTemplate> ();
if (!ItemTemplates.ContainsKey ("default"))
ItemTemplates["default"] = new ItemTemplate (ItemTemplate);
for (int i = 1; i <= (data.Count / itemPerPage) + 1; i++) {
if (cancelLoading)
return;
loadPage (i);
}
}
void cancelLoadingThread(){
if (loadingThread == null)
return;
if (!loadingThread.IsAlive)
return;
cancelLoading = true;
loadingThread.Join ();
cancelLoading = false;
}
void loadPage(int pageNum)
{
#if DEBUG_LOAD
Stopwatch loadingTime = new Stopwatch ();
loadingTime.Start ();
#endif
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 = Measure.Fit;
Interface.Bindings.Add(new Binding (this, "Height", "../HeightPolicy"));
} else {
page.Height = Measure.Fit;
Interface.Bindings.Add(new Binding (this, "Width", "../WidthPolicy"));
}
for (int i = (pageNum - 1) * itemPerPage; i < pageNum * itemPerPage; i++) {
if (i >= data.Count)
break;
if (cancelLoading)
return;
GraphicObject g = null;
ItemTemplate itemStream = null;
Type dataType = data [i].GetType ();
if (ItemTemplates.ContainsKey (dataType.FullName))
itemStream = ItemTemplates [dataType.FullName];
else
itemStream = ItemTemplates ["default"];
lock (Interface.CurrentInterface.LayoutMutex) {
g = itemStream.Instance;
page.AddChild (g);
g.DataSource = data [i];
}
if (this is TreeView) {
TreeView tv = this as TreeView;
while (!tv.IsRoot) {
ILayoutable tmp = tv.Parent;
while (!(tmp is TreeView)) {
tmp = tmp.Parent;
}
tv = tmp as TreeView;
}
g.MouseClick += tv.itemClick;
}else
g.MouseClick += itemClick;
if (itemStream.Expand != null && g is Expandable) {
(g as Expandable).Expand += itemStream.Expand;
}
//g.LogicalParent = this;
}
lock (Interface.CurrentInterface.LayoutMutex)
_list.AddChild (page);
#if DEBUG_LOAD
loadingTime.Stop ();
Debug.WriteLine("Listbox {2} Loading: {0} ticks \t, {1} ms",
loadingTime.ElapsedTicks,
loadingTime.ElapsedMilliseconds, this.ToString());
#endif
}
protected void _list_LayoutChanged (object sender, LayoutingEventArgs e)
{
#if DEBUG_LAYOUTING
Debug.WriteLine("list_LayoutChanged");
#endif
if (_gsList.Orientation == Orientation.Horizontal) {
if (e.LayoutType == LayoutingType.Width)
_gsList.Width = approxSize;
} else if (e.LayoutType == LayoutingType.Height)
_gsList.Height = approxSize;
}
int approxSize
{
get {
if (data == null)
return -1;
GenericStack page1 = _list.FindByName ("page1") as GenericStack;
if (page1 == null)
return -1;
return page1.Orientation == Orientation.Horizontal ?
data.Count < itemPerPage ?
-1:
(int)Math.Ceiling ((double)page1.Slot.Width / (double)itemPerPage * (double)(data.Count+1)):
data.Count < itemPerPage ?
-1:
(int)Math.Ceiling ((double)page1.Slot.Height / (double)itemPerPage * (double)(data.Count+1));
}
}
internal virtual void itemClick(object sender, MouseButtonEventArgs e){
SelectedIndex = data.IndexOf((sender as GraphicObject).DataSource);
}
}
}
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