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ResultPanelViewModel -> ResultsViewModel, part 1

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part of refactoring for PR #494
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bao-qian
2016-02-21 14:30:13 +00:00
parent 0e6cd0f72a
commit 78b44a1319
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Wox/ViewModel/ResultsViewModel.cs Normal file
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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using Wox.Core.UserSettings;
using Wox.Plugin;
using Wox.Storage;
namespace Wox.ViewModel
{
public class ResultPanelViewModel : BaseViewModel
{
#region Private Fields
private ResultItemViewModel _selectedResult;
private ResultCollection _results;
private bool _isVisible;
private Thickness _margin;
private readonly object _resultsUpdateLock = new object();
#endregion
#region Constructor
public ResultPanelViewModel()
{
this._results = new ResultCollection();
}
#endregion
#region ViewModel Properties
public int MaxHeight
{
get
{
return UserSettingStorage.Instance.MaxResultsToShow * 50;
}
}
public ResultCollection Results
{
get
{
return this._results;
}
}
public ResultItemViewModel SelectedResult
{
get
{
return this._selectedResult;
}
set
{
if (null != value)
{
if (null != _selectedResult)
{
_selectedResult.IsSelected = false;
}
_selectedResult = value;
if (null != _selectedResult)
{
_selectedResult.IsSelected = true;
}
}
OnPropertyChanged("SelectedResult");
}
}
public Thickness Margin
{
get
{
return this._margin;
}
set
{
this._margin = value;
OnPropertyChanged("Margin");
}
}
#endregion
#region Private Methods
private bool IsTopMostResult(Result result)
{
return TopMostRecordStorage.Instance.IsTopMost(result);
}
private int InsertIndexOf(int newScore, IList<ResultItemViewModel> list)
{
int index = 0;
for (; index < list.Count; index++)
{
var result = list[index];
if (newScore > result.RawResult.Score)
{
break;
}
}
return index;
}
#endregion
#region Public Methods
public void SelectResult(int index)
{
if(index <= this.Results.Count - 1)
{
this.SelectedResult = this.Results[index];
}
}
public void SelectNextResult()
{
if (null != this.SelectedResult)
{
var index = this.Results.IndexOf(this.SelectedResult);
if(index == this.Results.Count - 1)
{
index = -1;
}
this.SelectedResult = this.Results.ElementAt(index + 1);
}
}
public void SelectPrevResult()
{
if (null != this.SelectedResult)
{
var index = this.Results.IndexOf(this.SelectedResult);
if (index == 0)
{
index = this.Results.Count;
}
this.SelectedResult = this.Results.ElementAt(index - 1);
}
}
public void SelectNextPage()
{
var index = 0;
if (null != this.SelectedResult)
{
index = this.Results.IndexOf(this.SelectedResult);
}
index += 5;
if (index > this.Results.Count - 1)
{
index = this.Results.Count - 1;
}
this.SelectedResult = this.Results.ElementAt(index);
}
public void SelectPrevPage()
{
var index = 0;
if (null != this.SelectedResult)
{
index = this.Results.IndexOf(this.SelectedResult);
}
index -= 5;
if (index < 0)
{
index = 0;
}
this.SelectedResult = this.Results.ElementAt(index);
}
public void Clear()
{
this._results.Clear();
}
public void RemoveResultsExcept(PluginMetadata metadata)
{
lock (_resultsUpdateLock)
{
_results.RemoveAll(r => r.RawResult.PluginID != metadata.ID);
}
}
public void RemoveResultsFor(PluginMetadata metadata)
{
lock (_resultsUpdateLock)
{
_results.RemoveAll(r => r.RawResult.PluginID == metadata.ID);
}
}
public void AddResults(List<Result> newRawResults, string resultId)
{
lock (_resultsUpdateLock)
{
var newResults = new List<ResultItemViewModel>();
newRawResults.ForEach((re) => { newResults.Add(new ResultItemViewModel(re)); });
// todo use async to do new result calculation
var resultsCopy = _results.ToList();
var oldResults = resultsCopy.Where(r => r.RawResult.PluginID == resultId).ToList();
// intersection of A (old results) and B (new newResults)
var intersection = oldResults.Intersect(newResults).ToList();
// remove result of relative complement of B in A
foreach (var result in oldResults.Except(intersection))
{
resultsCopy.Remove(result);
}
// update scores
foreach (var result in newResults)
{
if (IsTopMostResult(result.RawResult))
{
result.RawResult.Score = int.MaxValue;
}
}
// update index for result in intersection of A and B
foreach (var commonResult in intersection)
{
int oldIndex = resultsCopy.IndexOf(commonResult);
int oldScore = resultsCopy[oldIndex].RawResult.Score;
int newScore = newResults[newResults.IndexOf(commonResult)].RawResult.Score;
if (newScore != oldScore)
{
var oldResult = resultsCopy[oldIndex];
oldResult.RawResult.Score = newScore;
resultsCopy.RemoveAt(oldIndex);
int newIndex = InsertIndexOf(newScore, resultsCopy);
resultsCopy.Insert(newIndex, oldResult);
}
}
// insert result in relative complement of A in B
foreach (var result in newResults.Except(intersection))
{
int newIndex = InsertIndexOf(result.RawResult.Score, resultsCopy);
resultsCopy.Insert(newIndex, result);
}
// update UI in one run, so it can avoid UI flickering
_results.Update(resultsCopy);
if(this._results.Count > 0)
{
this.Margin = new Thickness { Top = 8 };
this.SelectedResult = this._results[0];
}
else
{
this.Margin = new Thickness { Top = 0 };
}
}
}
#endregion
public class ResultCollection : ObservableCollection<ResultItemViewModel>
// todo implement custom moveItem,removeItem,insertItem for better performance
{
public ResultCollection()
{
}
public void RemoveAll(Predicate<ResultItemViewModel> predicate)
{
CheckReentrancy();
List<ResultItemViewModel> itemsToRemove = Items.Where(x => predicate(x)).ToList();
if (itemsToRemove.Count > 0)
{
itemsToRemove.ForEach(item => {
Items.Remove(item);
});
OnPropertyChanged(new PropertyChangedEventArgs("Count"));
OnPropertyChanged(new PropertyChangedEventArgs("Item[]"));
// fuck ms
// http://blogs.msdn.com/b/nathannesbit/archive/2009/04/20/addrange-and-observablecollection.aspx
// http://geekswithblogs.net/NewThingsILearned/archive/2008/01/16/listcollectionviewcollectionview-doesnt-support-notifycollectionchanged-with-multiple-items.aspx
// PS: don't use Reset for other data updates, it will cause UI flickering
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
}
}
public void Update(List<ResultItemViewModel> newItems)
{
int newCount = newItems.Count;
int oldCount = Items.Count;
int location = newCount > oldCount ? oldCount : newCount;
for (int i = 0; i < location; i++)
{
ResultItemViewModel oldItem = Items[i];
ResultItemViewModel newItem = newItems[i];
if (!oldItem.Equals(newItem))
{
this[i] = newItem;
}
else if (oldItem.RawResult.Score != newItem.RawResult.Score)
{
this[i].RawResult.Score = newItem.RawResult.Score;
}
}
if (newCount > oldCount)
{
for (int i = oldCount; i < newCount; i++)
{
Add(newItems[i]);
}
}
else
{
int removeIndex = newCount;
for (int i = newCount; i < oldCount; i++)
{
RemoveAt(removeIndex);
}
}
}
}
}
}