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Code Issues 1 Projects 1 Releases Wiki Activity

improvements persisting view model properties

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This commit is contained in:
Holger Börchers 2020-02-24 21:31:20 +01:00
parent 59d711da53
commit 046639681f
4 changed files with 74 additions and 45 deletions
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2
MainWindow.xaml
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@ -8,7 +8,7 @@
xmlns:propertyPresenter2="clr-namespace:ModernWpfPlayground.PropertyPresenter2"
xmlns:ui="http://schemas.modernwpf.com/2019"
x:Name="Window"
Title="TaBEA 3.0.0"
Title="{Binding Title}"
Width="1200"
Height="600"
ui:TitleBar.ExtendViewIntoTitleBar="True"

4
ModernWpfPlayground.csproj
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@ -8,11 +8,11 @@
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="2.9.6">
<PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="2.9.8">
<PrivateAssets>all</PrivateAssets>
<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
</PackageReference>
<PackageReference Include="ModernWpfUI" Version="0.8.0" />
<PackageReference Include="ModernWpfUI" Version="0.8.1" />
<PackageReference Include="System.Drawing.Common" Version="4.7.0" />
</ItemGroup>

33
MvvmStuff/BaseViewModel.cs
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@ -11,16 +11,17 @@ namespace ModernWpfPlayground.MvvmStuff
{
public abstract class BaseViewModel : INotifyPropertyChanged
{
private readonly Dictionary<string, object> _values = new Dictionary<string, object>();
private readonly Dictionary<string, object> _valueDict = new Dictionary<string, object>();
public IReadOnlyDictionary<string, object> Values => _values;
protected bool SetProperty<T>(T value, Action<T>? onChanged = null,
[CallerMemberName] string? propertyName = null)
{
if(propertyName == null) throw new ArgumentNullException(nameof(propertyName));
if (_valueDict.TryGetValue(propertyName, out var obj) && Equals(value, obj)) return false;
if (_values.TryGetValue(propertyName, out var obj) && Equals(value, obj)) return false;
_valueDict[propertyName] = value!;
_values[propertyName] = value!;
OnPropertyChanged(propertyName);
onChanged?.Invoke(value);
return true;
@ -29,7 +30,7 @@ namespace ModernWpfPlayground.MvvmStuff
protected T GetProperty<T>(T defaultValue = default, [CallerMemberName] string? propertyName = null)
{
if (propertyName == null) throw new ArgumentNullException(nameof(propertyName));
return _valueDict.TryGetValue(propertyName, out var obj) ? (T) obj : defaultValue;
return Values.TryGetValue(propertyName, out var obj) ? (T) obj : defaultValue;
}
public event PropertyChangedEventHandler? PropertyChanged;
@ -42,32 +43,22 @@ namespace ModernWpfPlayground.MvvmStuff
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
protected void SaveViewModel()
{
var contents = JsonSerializer.Serialize(_valueDict);
var saveFileDialog = new SaveFileDialog {AddExtension = true, DefaultExt = "*.json"};
var result = saveFileDialog.ShowDialog(Application.Current.MainWindow?.Owner);
if (result == true)
{
File.WriteAllText(saveFileDialog.FileName, contents);
}
}
protected void ResetViewModel()
{
foreach (var key in _valueDict.Keys)
foreach (var key in Values.Keys)
{
_valueDict.Remove(key);
_values.Remove(key);
OnPropertyChanged(key);
}
}
protected void MapDictionary(IEnumerable<(string, object?)> tuples)
protected abstract IEnumerable<(string key, object? value)> GetViewModelItems();
protected void LoadViewModel()
{
if (tuples == null) throw new ArgumentNullException(nameof(tuples));
foreach (var (key, value) in tuples)
foreach (var (key, value) in GetViewModelItems())
{
_valueDict[key] = value!;
_values[key] = value!;
OnPropertyChanged(key);
}
}

80
WindowViewModel.cs
View File

@ -15,6 +15,31 @@ namespace ModernWpfPlayground
{
private readonly PropertyInfo[] _properties;
private string? _path;
private string _title = AppName;
private const string AppName = "TaBEA 3.0.0";
public string? Path
{
get => _path;
private set
{
if (Equals(_path, value)) return;
_path = value;
OnPropertyChanged();
Title = value != null ? $"{System.IO.Path.GetFileName(value)} - {AppName}" : AppName;
}
}
public string Title
{
get => _title;
set
{
if (Equals(_title, value)) return;
_title = value;
OnPropertyChanged();
}
}
public WindowViewModel()
{
@ -22,7 +47,11 @@ namespace ModernWpfPlayground
CloseCommand = new RelayCommand(x => Application.Current.Shutdown());
OpenViewModelCommand = new RelayCommand(x => LoadViewModel());
SaveViewModelCommand = new RelayCommand(x => SaveViewModel());
ResetViewModelCommand = new RelayCommand(x => ResetViewModel());
ResetViewModelCommand = new RelayCommand(x =>
{
ResetViewModel();
Path = null;
});
_properties = GetType().GetProperties();
}
@ -78,26 +107,6 @@ namespace ModernWpfPlayground
public ICommand ResetViewModelCommand { get; }
private void LoadViewModel()
{
var list = ReadFromJson();
MapDictionary(list);
}
private IEnumerable<(string, object?)> ReadFromJson()
{
var openFileDialog = new OpenFileDialog { AddExtension = true, DefaultExt = "*.json" };
var result = openFileDialog.ShowDialog(Application.Current.MainWindow?.Owner);
if (result != true) yield break;
var contents = File.ReadAllText(_path = openFileDialog.FileName);
var obj = JsonSerializer.Deserialize<Dictionary<string, JsonElement>>(contents);
foreach (var (key, value) in obj)
{
yield return (key, CastToType(key, value));
}
}
private object? CastToType(string key, JsonElement value)
{
@ -106,6 +115,7 @@ namespace ModernWpfPlayground
{
return default;
}
if (property.PropertyType == typeof(double))
{
return value.GetDouble();
@ -133,5 +143,33 @@ namespace ModernWpfPlayground
return default;
}
private void SaveViewModel()
{
var contents = JsonSerializer.Serialize(Values);
if (Path == null)
{
var saveFileDialog = new SaveFileDialog {AddExtension = true, DefaultExt = "*.json"};
var result = saveFileDialog.ShowDialog(Application.Current.MainWindow?.Owner);
if (result != true) return;
Path = saveFileDialog.FileName;
}
File.WriteAllText(Path, contents);
}
protected override IEnumerable<(string key, object? value)> GetViewModelItems()
{
var openFileDialog = new OpenFileDialog {AddExtension = true, DefaultExt = "*.json"};
var result = openFileDialog.ShowDialog(Application.Current.MainWindow?.Owner);
if (result != true) yield break;
var contents = File.ReadAllText(Path = openFileDialog.FileName);
var obj = JsonSerializer.Deserialize<Dictionary<string, JsonElement>>(contents);
foreach (var (key, value) in obj)
{
yield return (key, CastToType(key, value));
}
}
}
}