From 7a0596fa7a18d85f4aed41381124da6b2a5c0377 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Plesz=20G=C3=A1bor?= <gabor.plesz@gmail.com>
Date: Fri, 28 Dec 2018 18:22:04 +0100
Subject: [PATCH] =?UTF-8?q?#3=20#11:=20N=C3=A9h=C3=A1ny=20apr=C3=B3bb=20ja?=
 =?UTF-8?q?v=C3=ADt=C3=A1s,=20ha=20nem=20valid=20a=20k=C3=A9perny=C5=91=20?=
 =?UTF-8?q?akkor=20jelezz=C3=BCk?=
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Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../Converters/BoolToVisibilityConverter.cs   | 39 ++++++++++++++++++
 pg.DarkSky.Wpf/MainWindow.xaml                | 21 +++++++---
 pg.DarkSky.Wpf/MainWindow.xaml.cs             |  5 ---
 pg.DarkSky.Wpf/ViewModels/MainViewModel.cs    | 40 ++++++++++++++++++-
 pg.DarkSky.Wpf/pg.DarkSky.Wpf.csproj          |  1 +
 5 files changed, 95 insertions(+), 11 deletions(-)
 create mode 100644 pg.DarkSky.Wpf/Converters/BoolToVisibilityConverter.cs

diff --git a/pg.DarkSky.Wpf/Converters/BoolToVisibilityConverter.cs b/pg.DarkSky.Wpf/Converters/BoolToVisibilityConverter.cs
new file mode 100644
index 0000000..4ad54e1
--- /dev/null
+++ b/pg.DarkSky.Wpf/Converters/BoolToVisibilityConverter.cs
@@ -0,0 +1,39 @@
+using System;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
+
+namespace pg.DarkSky.Wpf.Converters
+{
+    [ValueConversion(typeof(bool), typeof(Visibility))]
+    public sealed class BoolToVisibilityConverter : IValueConverter
+    {
+        public Visibility TrueValue { get; set; }
+        public Visibility FalseValue { get; set; }
+
+        public BoolToVisibilityConverter()
+        {
+            // set defaults
+            TrueValue = Visibility.Visible;
+            FalseValue = Visibility.Collapsed;
+        }
+
+        public object Convert(object value, Type targetType,
+            object parameter, CultureInfo culture)
+        {
+            if (!(value is bool))
+                return null;
+            return (bool)value ? TrueValue : FalseValue;
+        }
+
+        public object ConvertBack(object value, Type targetType,
+            object parameter, CultureInfo culture)
+        {
+            if (Equals(value, TrueValue))
+                return true;
+            if (Equals(value, FalseValue))
+                return false;
+            return null;
+        }
+    }
+}
diff --git a/pg.DarkSky.Wpf/MainWindow.xaml b/pg.DarkSky.Wpf/MainWindow.xaml
index 2c405f3..8ee40f8 100644
--- a/pg.DarkSky.Wpf/MainWindow.xaml
+++ b/pg.DarkSky.Wpf/MainWindow.xaml
@@ -7,13 +7,18 @@
                       xmlns:Controls="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro"
                       xmlns:iconPacks="http://metro.mahapps.com/winfx/xaml/iconpacks"
                       xmlns:vm="clr-namespace:pg.DarkSky.Wpf.ViewModels" 
-                      xmlns:helpers="clr-namespace:pg.DarkSky.Wpf.Helpers" 
+                      xmlns:helpers="clr-namespace:pg.DarkSky.Wpf.Helpers"
+                      xmlns:converters="clr-namespace:pg.DarkSky.Wpf.Converters"
                       mc:Ignorable="d"
                       DataContext="{x:Static vm:ViewModelLocator.MainViewModel }"
                       MinHeight="450" MinWidth="650"
                       Title="pg.DarkSky" Height="450" Width="800">
     <Window.Resources>
-        <BooleanToVisibilityConverter x:Key="VisibleIfTrueConverter" />
+        <BooleanToVisibilityConverter x:Key="VisibleIfTrueConverter" 
+ />
+        <converters:BoolToVisibilityConverter x:Key="VisibleIfTrueConverter2" 
+                                              TrueValue="Visible" 
+                                              FalseValue="Hidden" />
     </Window.Resources>
     <Grid>
         <Grid.RowDefinitions>
@@ -40,11 +45,17 @@
                       DisplayMemberPath="Name" 
                       SelectedValuePath="Code" 
                       SelectedItem="{Binding SelectedLanguage}"
-                      ToolTip="{DynamicResource MainWindow.SelectableLanguage}" SelectionChanged="CboSelectableLanguage_SelectionChanged"/>
+                      ToolTip="{DynamicResource MainWindow.SelectableLanguage}"/>
             <Button Grid.Column="2"
-                    Content="{iconPacks:FeatherIcons Kind=Repeat}"
                     ToolTip="{DynamicResource MainWindow.RefreshData}"
-                    Command="{Binding RefreshDataCommand}" />
+                    Command="{Binding RefreshDataCommand}" >
+                <Button.Content>
+                    <Grid>
+                        <Label Content="{iconPacks:FeatherIcons Kind=Repeat}" 
+                               Visibility="{Binding IsNotValid, Converter={StaticResource VisibleIfTrueConverter2} }"/>
+                    </Grid>
+                </Button.Content>
+            </Button>
         </Grid>
         <Grid Grid.Row="1" 
               Visibility="{Binding HasSuccess, Converter={StaticResource VisibleIfTrueConverter} }"
diff --git a/pg.DarkSky.Wpf/MainWindow.xaml.cs b/pg.DarkSky.Wpf/MainWindow.xaml.cs
index cce1bed..f2d4de6 100644
--- a/pg.DarkSky.Wpf/MainWindow.xaml.cs
+++ b/pg.DarkSky.Wpf/MainWindow.xaml.cs
@@ -19,10 +19,5 @@ public MainWindow()
         {
             InitializeComponent();
         }
-
-        private void CboSelectableLanguage_SelectionChanged(object sender, System.Windows.Controls.SelectionChangedEventArgs e)
-        {
-
-        }
     }
 }
diff --git a/pg.DarkSky.Wpf/ViewModels/MainViewModel.cs b/pg.DarkSky.Wpf/ViewModels/MainViewModel.cs
index 476b708..950777a 100644
--- a/pg.DarkSky.Wpf/ViewModels/MainViewModel.cs
+++ b/pg.DarkSky.Wpf/ViewModels/MainViewModel.cs
@@ -65,8 +65,32 @@ public bool IsBusy
             }
         }
 
+        //Ez pedig a negáltja az egyszerűbb használathoz
         public bool IsNotBusy { get { return !IsBusy; } }
 
+        private bool _isValid = false;
+        /// <summary>
+        /// Jelzi, hogy a képernyőn lévő adatok rendben vannak-e?
+        /// vagyis a lenyílók és a megjelenített adatok egymáshoz tartoznak-e. Ha nem, akkor 
+        /// false, ha igen, akkor true
+        /// </summary>
+        public bool IsValid
+        {
+            get { return _isValid; }
+            set
+            {
+                SetProperty(value, ref _isValid);
+                OnPropertyChanged(nameof(IsNotValid));
+            }
+        }
+
+        //Ez pedig a negáltja az egyszerűbb használathoz
+        public bool IsNotValid
+        {
+            get { return !IsValid; }
+            set { }
+        }
+
         public bool IsWorking
         {
             get
@@ -113,6 +137,8 @@ public Language SelectedLanguage
                 if (SetProperty(value, ref _selectedLanguage))
                 {
                     OnSelectedLanguageChanged(SelectedLanguage);
+                    //jelezzük, hogy a képernyőn lévő adatok mér nem ehhez a lenyíló értékhez tartoznak
+                    IsValid = false;
                 }
             }
         }
@@ -169,7 +195,18 @@ private void OnSelectedLanguageChanged(Language selectedLanguage)
 
         #region City Datasource to combobox
         private City _selectedCity;
-        public City SelectedCity { get { return _selectedCity; } set { SetProperty(value, ref _selectedCity); } }
+        public City SelectedCity
+        {
+            get { return _selectedCity; }
+            set
+            {
+                if (SetProperty(value, ref _selectedCity))
+                {
+                    //jelezzük, hogy a képernyőn lévő adatok mér nem ehhez a lenyíló értékhez tartoznak
+                    IsValid = false;
+                }
+            }
+        }
 
         private ObservableCollection<City> _selectableCity;
         public ObservableCollection<City> SelectableCity { get { return _selectableCity; } set { SetProperty(value, ref _selectableCity); } }
@@ -223,6 +260,7 @@ private async Task RefreshData()
             finally
             {
                 IsBusy = false;
+                IsValid = true;
                 CommandManager.InvalidateRequerySuggested();
             }
         }
diff --git a/pg.DarkSky.Wpf/pg.DarkSky.Wpf.csproj b/pg.DarkSky.Wpf/pg.DarkSky.Wpf.csproj
index 879f1fd..e1d941d 100644
--- a/pg.DarkSky.Wpf/pg.DarkSky.Wpf.csproj
+++ b/pg.DarkSky.Wpf/pg.DarkSky.Wpf.csproj
@@ -55,6 +55,7 @@
       <Generator>MSBuild:Compile</Generator>
       <SubType>Designer</SubType>
     </ApplicationDefinition>
+    <Compile Include="Converters\BoolToVisibilityConverter.cs" />
     <Compile Include="Helpers\ExtendedBinding.cs" />
     <Compile Include="Helpers\GlobalStrings.cs" />
     <Compile Include="Helpers\IconHelpers.cs" />