Mixing
HamburgerMenuItem IsEnabled property cannot be updated on runtime
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I am having a problem updating the IsEnabled property from HamburgerMenuItem.
First, I set the value of IsEnabledProperty to be false, and then during runtime, I am trying to change it to true, but debugger keeps saying that the value is false. And, of course the UI also still shows that it is disabled. Below is the code:
View:
xmlns:controls="http://metro.mahapps.com/winfx/xaml/controls"
<UserControl.Resources>
<DataTemplate x:Key="MenuItemTemplate" DataType="{x:Type metro:HamburgerMenuGlyphItem}">
<Grid Height="50">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="50"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Column=0 Text="{Binding Glyph}"/>
<TextBlock Grid.Column=1 Text="{Binding Label}"/>
</Grid>
</DataTemplate>
</UserControl.Resources>
<controls:x:Name="HamburgerMenuControl"
DisplayMode="CompactInline"
ItemTemplate="{StaticResource MenuItemTemplate}"
ItemsSource="{Binding MenuItems, Mode=OneWay}"/>
<Button Content="Test Button" Command="{Binding TestCommand, Mode=OneTime}"/>
ViewModel:
private HamburgerMenuItemCollection menuItems;
public HamburgerMenuItemCollection MenuItems
{
get {return menuItems;}
set {SetProperty(ref menuItems, value);}
}
public ICommand TestCommand {get; private set;}
public MyVM()
{
MenuItems = new HamburgerMenuItemCollection()
{
new HamburgerMenuGlyphItem()
{
Glyph="1",
Label="1"
};
// Second MenuItem is disabled
new HamburgerMenuGlyphItem()
{
Glyph="2",
Label="2",
IsEnabled=false;
};
};
TestCommand = new DelegateCommand(UpdateIsEnabled);
}
private void UpdateIsEnabled()
{
var menuItem = MenuItems[1];
menuItem.IsEnabled = true; // after this is executed, Debugger shows that IsEnabled is still false;
if (menuItem.IsEnabled != isEnabled)
{
vm.BeginInvoke(() =>
{
vm.IsEnabled = isEnabled; // redo, but it seems like none of these are called
vm.SetValue(HamburgerMenuGlyphItem.IsEnabledProperty, isEnabled);
vm.SetCurrentValue(HamburgerMenuGlyphItem.IsEnabledProperty, isEnabled);
vm.InvalidateProperty(HamburgerMenuGlyphItem.IsEnabledProperty);
}, System.Windows.Threading.DispatcherPriority.Normal);
}
RaisePropertyChanged(nameof(MenuItems));
}
Can you show me what I did wrong and how to update the IsEnabled Dependency Property properly?
wpf xaml mahapps.metro
asked Jan 3 at 14:43
kurakura88kurakura88
1,6421417
add a comment |
I am having a problem updating the IsEnabled property from HamburgerMenuItem.
First, I set the value of IsEnabledProperty to be false, and then during runtime, I am trying to change it to true, but debugger keeps saying that the value is false. And, of course the UI also still shows that it is disabled. Below is the code:
View:
xmlns:controls="http://metro.mahapps.com/winfx/xaml/controls"
<UserControl.Resources>
<DataTemplate x:Key="MenuItemTemplate" DataType="{x:Type metro:HamburgerMenuGlyphItem}">
<Grid Height="50">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="50"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Column=0 Text="{Binding Glyph}"/>
<TextBlock Grid.Column=1 Text="{Binding Label}"/>
</Grid>
</DataTemplate>
</UserControl.Resources>
<controls:x:Name="HamburgerMenuControl"
DisplayMode="CompactInline"
ItemTemplate="{StaticResource MenuItemTemplate}"
ItemsSource="{Binding MenuItems, Mode=OneWay}"/>
<Button Content="Test Button" Command="{Binding TestCommand, Mode=OneTime}"/>
ViewModel:
private HamburgerMenuItemCollection menuItems;
public HamburgerMenuItemCollection MenuItems
{
get {return menuItems;}
set {SetProperty(ref menuItems, value);}
}
public ICommand TestCommand {get; private set;}
public MyVM()
{
MenuItems = new HamburgerMenuItemCollection()
{
new HamburgerMenuGlyphItem()
{
Glyph="1",
Label="1"
};
// Second MenuItem is disabled
new HamburgerMenuGlyphItem()
{
Glyph="2",
Label="2",
IsEnabled=false;
};
};
TestCommand = new DelegateCommand(UpdateIsEnabled);
}
private void UpdateIsEnabled()
{
var menuItem = MenuItems[1];
menuItem.IsEnabled = true; // after this is executed, Debugger shows that IsEnabled is still false;
if (menuItem.IsEnabled != isEnabled)
{
vm.BeginInvoke(() =>
{
vm.IsEnabled = isEnabled; // redo, but it seems like none of these are called
vm.SetValue(HamburgerMenuGlyphItem.IsEnabledProperty, isEnabled);
vm.SetCurrentValue(HamburgerMenuGlyphItem.IsEnabledProperty, isEnabled);
vm.InvalidateProperty(HamburgerMenuGlyphItem.IsEnabledProperty);
}, System.Windows.Threading.DispatcherPriority.Normal);
}
RaisePropertyChanged(nameof(MenuItems));
}
Can you show me what I did wrong and how to update the IsEnabled Dependency Property properly?
wpf xaml mahapps.metro
asked Jan 3 at 14:43
kurakura88kurakura88
1,6421417
add a comment |
I am having a problem updating the IsEnabled property from HamburgerMenuItem.
First, I set the value of IsEnabledProperty to be false, and then during runtime, I am trying to change it to true, but debugger keeps saying that the value is false. And, of course the UI also still shows that it is disabled. Below is the code:
View:
xmlns:controls="http://metro.mahapps.com/winfx/xaml/controls"
<UserControl.Resources>
<DataTemplate x:Key="MenuItemTemplate" DataType="{x:Type metro:HamburgerMenuGlyphItem}">
<Grid Height="50">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="50"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Column=0 Text="{Binding Glyph}"/>
<TextBlock Grid.Column=1 Text="{Binding Label}"/>
</Grid>
</DataTemplate>
</UserControl.Resources>
<controls:x:Name="HamburgerMenuControl"
DisplayMode="CompactInline"
ItemTemplate="{StaticResource MenuItemTemplate}"
ItemsSource="{Binding MenuItems, Mode=OneWay}"/>
<Button Content="Test Button" Command="{Binding TestCommand, Mode=OneTime}"/>
ViewModel:
private HamburgerMenuItemCollection menuItems;
public HamburgerMenuItemCollection MenuItems
{
get {return menuItems;}
set {SetProperty(ref menuItems, value);}
}
public ICommand TestCommand {get; private set;}
public MyVM()
{
MenuItems = new HamburgerMenuItemCollection()
{
new HamburgerMenuGlyphItem()
{
Glyph="1",
Label="1"
};
// Second MenuItem is disabled
new HamburgerMenuGlyphItem()
{
Glyph="2",
Label="2",
IsEnabled=false;
};
};
TestCommand = new DelegateCommand(UpdateIsEnabled);
}
private void UpdateIsEnabled()
{
var menuItem = MenuItems[1];
menuItem.IsEnabled = true; // after this is executed, Debugger shows that IsEnabled is still false;
if (menuItem.IsEnabled != isEnabled)
{
vm.BeginInvoke(() =>
{
vm.IsEnabled = isEnabled; // redo, but it seems like none of these are called
vm.SetValue(HamburgerMenuGlyphItem.IsEnabledProperty, isEnabled);
vm.SetCurrentValue(HamburgerMenuGlyphItem.IsEnabledProperty, isEnabled);
vm.InvalidateProperty(HamburgerMenuGlyphItem.IsEnabledProperty);
}, System.Windows.Threading.DispatcherPriority.Normal);
}
RaisePropertyChanged(nameof(MenuItems));
}
Can you show me what I did wrong and how to update the IsEnabled Dependency Property properly?
wpf xaml mahapps.metro
asked Jan 3 at 14:43
kurakura88kurakura88
1,6421417
I am having a problem updating the IsEnabled property from HamburgerMenuItem.
First, I set the value of IsEnabledProperty to be false, and then during runtime, I am trying to change it to true, but debugger keeps saying that the value is false. And, of course the UI also still shows that it is disabled. Below is the code:
View:
xmlns:controls="http://metro.mahapps.com/winfx/xaml/controls"
<UserControl.Resources>
<DataTemplate x:Key="MenuItemTemplate" DataType="{x:Type metro:HamburgerMenuGlyphItem}">
<Grid Height="50">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="50"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Column=0 Text="{Binding Glyph}"/>
<TextBlock Grid.Column=1 Text="{Binding Label}"/>
</Grid>
</DataTemplate>
</UserControl.Resources>
<controls:x:Name="HamburgerMenuControl"
DisplayMode="CompactInline"
ItemTemplate="{StaticResource MenuItemTemplate}"
ItemsSource="{Binding MenuItems, Mode=OneWay}"/>
<Button Content="Test Button" Command="{Binding TestCommand, Mode=OneTime}"/>
ViewModel:
private HamburgerMenuItemCollection menuItems;
public HamburgerMenuItemCollection MenuItems
{
get {return menuItems;}
set {SetProperty(ref menuItems, value);}
}
public ICommand TestCommand {get; private set;}
public MyVM()
{
MenuItems = new HamburgerMenuItemCollection()
{
new HamburgerMenuGlyphItem()
{
Glyph="1",
Label="1"
};
// Second MenuItem is disabled
new HamburgerMenuGlyphItem()
{
Glyph="2",
Label="2",
IsEnabled=false;
};
};
TestCommand = new DelegateCommand(UpdateIsEnabled);
}
private void UpdateIsEnabled()
{
var menuItem = MenuItems[1];
menuItem.IsEnabled = true; // after this is executed, Debugger shows that IsEnabled is still false;
if (menuItem.IsEnabled != isEnabled)
{
vm.BeginInvoke(() =>
{
vm.IsEnabled = isEnabled; // redo, but it seems like none of these are called
vm.SetValue(HamburgerMenuGlyphItem.IsEnabledProperty, isEnabled);
vm.SetCurrentValue(HamburgerMenuGlyphItem.IsEnabledProperty, isEnabled);
vm.InvalidateProperty(HamburgerMenuGlyphItem.IsEnabledProperty);
}, System.Windows.Threading.DispatcherPriority.Normal);
}
RaisePropertyChanged(nameof(MenuItems));
}
Can you show me what I did wrong and how to update the IsEnabled Dependency Property properly?
wpf xaml mahapps.metro
wpf xaml mahapps.metro
asked Jan 3 at 14:43
kurakura88kurakura88
1,6421417
asked Jan 3 at 14:43
kurakura88kurakura88
1,6421417
edited Jan 8 at 1:31
kurakura88
asked Jan 3 at 14:43
kurakura88kurakura88
1,6421417
asked Jan 3 at 14:43
kurakura88kurakura88
1,6421417
asked Jan 3 at 14:43
kurakura88kurakura88
1,6421417
1,6421417
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
To enable the HamburgerMenuItem you should sets its Command property to a command whose CanExecute method returns true.
You cannot just set the IsEnabled property to true. If you take a look at how the HamburgerMenuItem class is implemented on GitHub, you'll see that there is a CoerceValueCallback that returns the value of the private CanExecute method:
private static object IsEnabledCoerceValueCallback(DependencyObject d, object value)
{
if (!(bool)value)
{
return false;
}
return ((HamburgerMenuItem)d).CanExecute;
}
answered Jan 3 at 15:37
mm8mm8
89.2k81934
Sounds like IsEnabledProperty is really useless, because it cannot be changed once value is set. (Or maybe because I am not binding it to some property). In the meantime, I will use the ICommand's CanExecute as you suggested then.
– kurakura88
Jan 4 at 0:07
It doesn't matter whether you bind it to some property. You need to use the Command property to enable/disable the item.
– mm8
Jan 4 at 8:38
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
To enable the HamburgerMenuItem you should sets its Command property to a command whose CanExecute method returns true.
You cannot just set the IsEnabled property to true. If you take a look at how the HamburgerMenuItem class is implemented on GitHub, you'll see that there is a CoerceValueCallback that returns the value of the private CanExecute method:
private static object IsEnabledCoerceValueCallback(DependencyObject d, object value)
{
if (!(bool)value)
{
return false;
}
return ((HamburgerMenuItem)d).CanExecute;
}
answered Jan 3 at 15:37
mm8mm8
89.2k81934
Sounds like IsEnabledProperty is really useless, because it cannot be changed once value is set. (Or maybe because I am not binding it to some property). In the meantime, I will use the ICommand's CanExecute as you suggested then.
– kurakura88
Jan 4 at 0:07
It doesn't matter whether you bind it to some property. You need to use the Command property to enable/disable the item.
– mm8
Jan 4 at 8:38
add a comment |
To enable the HamburgerMenuItem you should sets its Command property to a command whose CanExecute method returns true.
You cannot just set the IsEnabled property to true. If you take a look at how the HamburgerMenuItem class is implemented on GitHub, you'll see that there is a CoerceValueCallback that returns the value of the private CanExecute method:
private static object IsEnabledCoerceValueCallback(DependencyObject d, object value)
{
if (!(bool)value)
{
return false;
}
return ((HamburgerMenuItem)d).CanExecute;
}
answered Jan 3 at 15:37
mm8mm8
89.2k81934
Sounds like IsEnabledProperty is really useless, because it cannot be changed once value is set. (Or maybe because I am not binding it to some property). In the meantime, I will use the ICommand's CanExecute as you suggested then.
– kurakura88
Jan 4 at 0:07
It doesn't matter whether you bind it to some property. You need to use the Command property to enable/disable the item.
– mm8
Jan 4 at 8:38
add a comment |
To enable the HamburgerMenuItem you should sets its Command property to a command whose CanExecute method returns true.
You cannot just set the IsEnabled property to true. If you take a look at how the HamburgerMenuItem class is implemented on GitHub, you'll see that there is a CoerceValueCallback that returns the value of the private CanExecute method:
private static object IsEnabledCoerceValueCallback(DependencyObject d, object value)
{
if (!(bool)value)
{
return false;
}
return ((HamburgerMenuItem)d).CanExecute;
}
answered Jan 3 at 15:37
mm8mm8
89.2k81934
To enable the HamburgerMenuItem you should sets its Command property to a command whose CanExecute method returns true.
You cannot just set the IsEnabled property to true. If you take a look at how the HamburgerMenuItem class is implemented on GitHub, you'll see that there is a CoerceValueCallback that returns the value of the private CanExecute method:
private static object IsEnabledCoerceValueCallback(DependencyObject d, object value)
{
if (!(bool)value)
{
return false;
}
return ((HamburgerMenuItem)d).CanExecute;
}
answered Jan 3 at 15:37
mm8mm8
89.2k81934
answered Jan 3 at 15:37
mm8mm8
89.2k81934
answered Jan 3 at 15:37
mm8mm8
89.2k81934
answered Jan 3 at 15:37
mm8mm8
89.2k81934
89.2k81934
Sounds like IsEnabledProperty is really useless, because it cannot be changed once value is set. (Or maybe because I am not binding it to some property). In the meantime, I will use the ICommand's CanExecute as you suggested then.
– kurakura88
Jan 4 at 0:07
It doesn't matter whether you bind it to some property. You need to use the Command property to enable/disable the item.
– mm8
Jan 4 at 8:38
add a comment |
Sounds like IsEnabledProperty is really useless, because it cannot be changed once value is set. (Or maybe because I am not binding it to some property). In the meantime, I will use the ICommand's CanExecute as you suggested then.
– kurakura88
Jan 4 at 0:07
It doesn't matter whether you bind it to some property. You need to use the Command property to enable/disable the item.
– mm8
Jan 4 at 8:38
Sounds like IsEnabledProperty is really useless, because it cannot be changed once value is set. (Or maybe because I am not binding it to some property). In the meantime, I will use the ICommand's CanExecute as you suggested then.
– kurakura88
Jan 4 at 0:07
Sounds like IsEnabledProperty is really useless, because it cannot be changed once value is set. (Or maybe because I am not binding it to some property). In the meantime, I will use the ICommand's CanExecute as you suggested then.
– kurakura88
Jan 4 at 0:07
It doesn't matter whether you bind it to some property. You need to use the Command property to enable/disable the item.
– mm8
Jan 4 at 8:38
It doesn't matter whether you bind it to some property. You need to use the Command property to enable/disable the item.
– mm8
Jan 4 at 8:38
add a comment |
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