i would like to create a custom base class for some of my UserControls.
Doing this in VS2008 is fine and compiles as expected, but when i edit the control in Blend 3 the base class in the blabla.g.vb is always changed back to System.Windows.Controls.UserControl.
How can i force Blend to keep the assigned base class?
regards
Christoph
Can you show your XAML?
I suspect the case is your XAML is like this:
<UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:SilverlightApplication15"
x:Class="SilverlightApplication15.MainPage"
Width="640"
Height="480">
<Grid x:Name="LayoutRoot"
Background="#FF313131" />
</UserControl>
When it should be something like:
<local:BlahBlah xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:SilverlightApplication15"
x:Class="SilverlightApplication15.MainPage"
Width="640"
Height="480">
<Grid x:Name="LayoutRoot"
Background="#FF313131" />
</local:BlahBlah>
The .g.vb file is generated from the XAML so it's not a file you should edit directly.
Related
I am creating a custom panel which is basically just a fancier StackPanel with some added functionality. I was going to use a UserControl which contains a StackPanel but I don't know how to make my UserControl accept content to fill it's StackPanel.
This is what I'm trying:
<UserControl
x:Class="transformations.fold_panel"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:transformations"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<StackPanel Orientation="Vertical">
<Button Content="First" />
<ContentControl Content="{x:Bind Content, Mode=OneWay}"></ContentControl>
</StackPanel>
</UserControl>
Usage:
<local:fold_panel>
<Button Content="Second" />
</local:fold_panel>
When I try this I get the following error:
WinRT originate error - 0x80070057 : 'The parameter is incorrect.'.
You can't bind the Content of a StackPanel in a UserControl's Content to the Content property of the same UserControl. This will introduce a circular reference.
In your example, the Content property of the fold_panel UserControl will be set to the StackPanel that you defined in the XAML markup.
If you want to be able to set the Content of the ContentControl in the StackPanel, you should add a custom dependency property to the fold_panel class and bind the Content property of the ContentControl to this one:
<ContentControl Content="{x:Bind CustomContent, Mode=OneWay}" />
You can then set your custom property something like this:
<local:fold_panel>
<local:fold_panel.CustomContent>
<Button Content="Second" />
<local:fold_panel.CustomContent>
</local:fold_panel>
But if you really want a custom StackPanel, you should create a class that inherits from StackPanel rather than UserControl.
I want to set the title on an XAML page with an XAML Page container. There is no "Title" or "WindowTitle" tag for Page. However, when run, the VS project name, XAML_001, appears in the title area. How do I set my own title?
I have tried using what I know from C#/WPF which uses an XAML Window container which does have a "Title" tag. But, this does not work for a VS 2017 Blank App (C++/WinRT).
<Page
x:Class="XAML_001.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:XAML_001"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<StackPanel Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center">
<Button x:Name="myButton" Click="ClickHandler">Click You</Button>
</StackPanel>
</Page>
I cannot figure out how to change the title.
I found that the title which appears in the Windows Title Bar for the C++/WinRT, XAML application is set in the Package.appxmanifest file, “Application” tab in the “Display name” text box.
For reasons of which I am unaware, the "Title" property is not in the Windows.UI.Xaml.Controls Page Class as it is for C#, WPF applications.
this code work correct:
<UserControl x:Class="Extended.InputControls.TextBoxUserControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:Extended.InputControls">
<TextBox x:Name="textBox"
ToolTip="{Binding Path=CustomToolTip,RelativeSource={RelativeSource AncestorType=local:TextBoxUserControl}}"/>
</UserControl>
but this code Does not work!!!
<UserControl x:Class="Extended.InputControls.TextBoxUserControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:Extended.InputControls">
<TextBox x:Name="textBox">
<TextBox.ToolTip>
<ToolTip Text="{Binding Path=CustomToolTip,RelativeSource={RelativeSource AncestorType=local:TextBoxUserControl}}" Background="Yellow"/>
</TextBox.ToolTip>
</TextBox>
</UserControl>
i need create custom tooltip and bind it to CustomToolTip but in second code that's not bind to anything
where is the problem?
First of all, if we're talking WPF here, it should be <ToolTip Content="..."> instead of <ToolTip Text="...">, since ToolTip has no Text property.
Regarding the binding: Binding to other elements in the user control from within a ToolTip doesn't work since ToolTip elements are not part of the visual tree, as explained in another question that also provides one potential solution.
However, it seems that you're binding to some property defined in the UserControl's code-behind? In that case it's even easier to solve by setting the UserControl's DataContext to the control itself:
<UserControl x:Class="Extended.InputControls.TextBoxUserControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:Extended.InputControls"
DataContext="{Binding RelativeSource={RelativeSource Self}}">
<TextBox x:Name="textBox">
<TextBox.ToolTip>
<ToolTip Content="{Binding CustomToolTip}" Background="Yellow"/>
</TextBox.ToolTip>
</TextBox>
</UserControl>
Alternatively, you could also set the DataContext in code-behind:
public TextBoxUserControl()
{
this.DataContext = this;
InitializeComponent();
}
In both cases, the CustomToolTip property can be accessed directly without the need for a RelativeSource binding.
An even better solution would be to introduce come kind of Viewmodel class that holds the CustomToolTip and all similar properties, and set this class as the UserControl's DataContext.
I'm attempting to use EventToCommand to initialize my ViewModel, but the command isn't firing. I suspect it's because the Triggers section is not within the databound container, but how can I do that in my example? I'm trying to stick to straight XAML if possible.
<Window x:Class="MVVMSample.Home"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:viewModels="clr-namespace:MVVMSample.ViewModels"
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
xmlns:cmd="clr-namespace:GalaSoft.MvvmLight.Command;assembly=GalaSoft.MvvmLight.Extras.WPF4"
d:DataContext="{d:DesignInstance Type=viewModels:HomeViewModel, IsDesignTimeCreatable=True}"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<viewModels:HomeViewModel x:Key="ViewModel" x:Name="ViewModel" />
</Window.Resources>
<i:Interaction.Triggers>
<i:EventTrigger EventName="Loaded">
<cmd:EventToCommand Command="{Binding LoadedCommand}" />
</i:EventTrigger>
</i:Interaction.Triggers>
<Grid DataContext="{StaticResource ViewModel}">
<TextBlock Text="{Binding PersonCount}" />
</Grid>
</Window>
You are right, the datacontext is part of the problem,but I would solve it by using mvvm-light as it was designed.
If you are using MVVM_Light then your should use the view model locator. Its the main backbone of the framework. I used mvvm light to learn about the mvvm principle. I liked it a lot because it was simple and allowed me to learn with as quick a learning curve as possible.
In mvvm-light you declare your viewmodellocator in your app.xaml
<Application.Resources>
<ResourceDictionary>
<!--Global View Model Locator-->
<vm:ViewModelLocator x:Key="Locator" d:IsDataSource="True" />
</ResourceDictionary>
</Application.Resources>
then in your view (be it a usercontrol or window etc) you "attach" you viewmodel to your view as follows: Notice the DataContext declaration.
<UserControl x:Class="FTC.View.TrackingListView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
xmlns:cmd="http://www.galasoft.ch/mvvmlight"
mc:Ignorable="d"
DataContext="{Binding YourViewModel, Source={StaticResource Locator}}"
d:DesignHeight="700" d:DesignWidth="1000">
This way the view model locator from mvvm light can either create a singleton of your viewmodel or a unique instance as you need. It can also use IOC to inject services into the constructor of your viewmodel.
So for example, if I have a viewmodel that deals with people objects from a datamodel, i create a people service that performs the CRUD operation and then reference it in the viewmodel constructor parameters. This allows me to use either fake design time data or real data from the model. It also keep all concerns decoupled, which is the purpose of mvvm.
I recommend reading more about the MVVM-light framwork and building one of the samples from thier site a galasoft.
See this video
hope this helps
It seems like every object that has been added to a page in a Windows 8 App gets this "slide from right to left"-entrance-transition which begins whenever someone navigates to the page.
Is there a possibility to remove single objects from this transition?
Neither
<Object.Transitions>
<TransitionCollection />
</Object.Transitions>
nor this thread helped...
Any ideas?
AFAIK There's no way to exempt a given object from the transitions applied by it's parents. The only thing I can suggest is to structure your xaml in such a way that the transition isn't applied. By this I mean having this special item in a panel that has no children transitions while the rest of the page is in a panel with a child transition. Depending on where this item is it could be very easy or difficult as hell.
As Nigel suggested, the only solution I have found has been to change the page structure and put the elements out of the grid that has the animations:
<Page
x:Class="App1.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App1"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<Grid.Transitions>
<TransitionCollection/>
<!-- Ensure no transitions in background -->
</Grid.Transitions>
<TextBlock FontSize="50" Margin="50">This item is not animated</TextBlock>
<Grid>
<Grid.ChildrenTransitions>
<TransitionCollection>
<!-- add transitions here -->
<EntranceThemeTransition FromVerticalOffset="1500" FromHorizontalOffset="1500"/>
</TransitionCollection>
</Grid.ChildrenTransitions>
<TextBlock Margin="50,100" FontSize="50">This item is animated</TextBlock>
</Grid>
<TextBlock FontSize="50" Margin="50,150">Another not animated item</TextBlock>
</Grid>
</Page>