I have a button in a page defined as:
<Button Content="{StaticResource resourcename}" HorizontalAlignment="Left" VerticalAlignment="Top" Width="32" Height="32" >
and the resource "resourcename" is defined in the app as follow:
<Grid x:Key="resourcename">
<Path Fill="Black" Stretch="Fill" Data="M7.99799,14.26781 .....
</Grid>
</Application.Resources>
When the application starts the following exception is raised:
Attribute {StaticResource resourcename} value is out of range.
I can't understand why, and BTW into the designer I can see the path correctly displayed. What I'm missing ?
I have seen people trying to and complaining about Content being set from a UIElement stored in a resources collection. I would refrain from that approach - one problem being - a UIElement might only be a child of a single UIElement. A better approach might be to store a DataTemplate in resources and set that DataTemplate as a button's ContentTemplate.
Related
Databinding still confues me and I am not sure how to essential make these controls repeat for each bound piece of data I have.
<Grid>
<TextBlock FontSize="25" Text="this is a header"></TextBlock>
<TextBlock Height="30" HorizontalAlignment="Left" Margin="19,36,0,0" Name="txt" Text="line under the header" VerticalAlignment="Top" />
<TextBlock Height="30" FontSize="25" HorizontalAlignment="Left" Margin="306,9,0,0" Name="textBlock2" Text="530" VerticalAlignment="Top" Width="91" />
<TextBlock Height="30" HorizontalAlignment="Left" Margin="305,42,0,0" Name="textBlock3" Text="30" VerticalAlignment="Top" Width="91" />
</Grid>
If my data source would have a count of 50. I would expect to see 50 of these groupings(I probably need to get a scroll bar though).
Not sure how to do this though. I need some sort of datatemplate I guess? Also "line under the header" should be clickable and highlight.
I think you need to use the control named "ItemsControl". Not a derived class, not a ListBox, just plain simple ItemsControl.
Either in code or in XAML, you set the ItemsControl's ItemsSource property to any collection containing your items.
In XAML (either in VS or Blend, to do it WYSIWYG in Blend you must somehow provide design data) you set the ItemsControl's ItemTemplate to a DataTemplate that contains the XAML subtree you want to repeat for every item in your collection.
Inside the DataTemplate, replace "line under the header" with the Button control, with Content="line under the header", and style it however you want. Then, add CallMethodAction to your button. It only takes 2 clicks in Blend, the first one is on "Assets" window. Specify TargetObject="{Binding}" MethodName="actSubtitleClicked". This way, the framework will call the void actSubtitleClicked() method of the item where user clicked the "line under the header".
For best performance, you should also modify the ItemsControl's ItemsPanel template, replacing StackPanel with VirtualizingStackPanel (again, a few clicks in Blend, the first one is the right click, then "Edit additional templates / ItemsPanel / Edit a copy")
I want to create a control which displays an image and a watermark (image or something else) on it.
But the watermark should be loaded from another XAML file in order to let people custom the way the watermark will appear : alignment, opacity, size, nature of the watermark (TextBlock, Image, ...).
For instance I could load my watermark with this appearance
<Border BorderThickness="5" BorderBrush="Aqua" Width="50" Height="50">
<Image Source="play.png" />
</Border>
This code is from my Themes/generic.xaml and MyWatermarkControl (inherits from Control) is the class which contain the code of the control (dependency properties).
<Style TargetType="local:MyWatermarkControl">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="local:MyWatermarkControl">
<Grid>
<Image Source="{TemplateBinding ImagePath}" />
<Image x:name="watermark" Source="play.png" /> <!--I want this to be loaded from another .xaml-->
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
My search results lead me to add in my ControlTemplate stuff like ContentPresenter, ContentTemplate, DataTemplate : so many results and I cannot understand how do they work but the fact they are nested
You can add a Source property to your MyWatermarkControl then bind the Source property of your embedded Image to this property. For more details see the following tutorial that I wrote:
A Simple Pattern for Creating Re-useable UserControls in WPF / Silverlight
I am learning expression blend using the following link http://visitmix.com/labs/rosetta/EyesOfBlend/DataTemplates/
It is a very good step by step instruction on using expression blend. I was able to do all the steps successfully and I was able to run the program and got the final result.
Right after step (9), before running the project, when I checked the designer, the designer did not show the image in the big image control I have added in step (9). I knew why, since the selected index of the ListBox was -1, so I changed the selectedindex to 0, now I was able to see the image. But when I compiled the code I get the following error
"Specified argument was out of the range of valid values. Parameter name:SelectedIndex"
XAML is
<Grid x:Name="LayoutRoot" Background="White" DataContext="{Binding Source={StaticResource SampleDataSource}}">
<Grid x:Name="itemGrid" DataContext="{Binding SelectedItem, ElementName=listBox}">
<Image Margin="185,56,153,160" Stretch="Fill" Source="{Binding Name}"/>
</Grid>
<ListBox x:Name="listBox" SelectedIndex="0" Margin="8,0,0,8" ItemsSource="{Binding Collection}" ItemTemplate="{StaticResource ItemTemplate1}" ItemsPanel="{StaticResource ItemsPanelTemplate1}" Height="101" VerticalAlignment="Bottom"/>
</Grid>
If I remove the selected index, all compile good. Could someone explain why it showed first time after compiling, it stopped working?
Thanks
You are almost always better binding to the SelectedItem than the SelectedIndex. If the Item is null, the binding should fail gracefully.
This is probably because the "Collection" attribute gets bound to the itemsource after the listbox is rendered. So if there is no collection(empty) then the first index [0] does not exist and it throws an "out of range exception".
To resolve your issue set the selected index in code-behind after collection is populated. Hope that helps.
I have a simple WP7 Programm where I want to switch between displaying my model objects in a ListBox and a Diagramm.
I want to use Data Templates and a Selector Class which returns the correct template.
The selector takes a boolean property in the view model and returns ListBoxTemplate or DiagrammTemplate
My Page Resources looks like this:
<local:NewTemplateSelector x:Key="NewTemplateSelector">
<local:NewTemplateSelector.ListBoxTemplate>
<DataTemplate>
<StackPanel>
<ListBox
x:Name="MainListBox" Margin="6,205,35,136" ItemsSource="{Binding Acts}"
ItemTemplate="{Binding ElementName=Page, Path=Orientation,
Converter={StaticResource OrientationToListItemTemplate}}" />
</StackPanel>
</DataTemplate>
</local:NewTemplateSelector.ListBoxTemplate>
<local:NewTemplateSelector.DiagrammTemplate>
<DataTemplate>
<TextBlock Text="Diagramm"/>
</DataTemplate>
</local:NewTemplateSelector.DiagrammTemplate>
</local:NewTemplateSelector>
My content Panel has only 1 element:
<ContentControl ContentTemplate="{Binding IsDiagramm,
Converter={StaticResource NewTemplateSelector}}" HorizontalAlignment="Left" HorizontalContentAlignment="Left" />
I always get a blank screen when I run this.
My Selector class returns the correct template, I can see this in the debugger.
When I replace the Listbox in the template with a simple textblock, the textblock is displayed, so I suspect a problem with databinding.
But the listbox in the template works fine, when I insert it in my content panel without any data templates.
Any hints for me?
You may like to refer to this thread which discusses nested listboxes.
Listbox Inside listbox Databinding Problem
FYI I'm pretty new to Silverlight.
Okay, so I want to build a simple user control that contains a button plus some additional XAML as specified by the client of the control.
I got searching on Google and found at least 30 different articles that were all very confusing; especially because they talk about styling animation, customizing other controls that you don't own, and other crap I'm not ready for yet.
This is what I did.
In VS 2010, I right clicked and added a new UserControl called MyControl
To the MyControl.xaml I changed the LayoutRoot to a StackPanel and added a Button inside it
In my MainPage.xaml I added an instance of MyControl
I added a TextBox as a child element of this instance
I tried to build and got an error that MyControl didn't support Direct Content
Googled some more..
I changed MyControl to inherit from ContentControl and updated the xaml
I added a ContentPresenter in the xaml to represent the client "custom content"
Okay, it builds and the TextBox shows up, but the Button is missing.
Here's the relevant section from MainPage.xaml
<my:MyControl HorizontalAlignment="Left" Margin="49,26,0,0" x:Name="myContentControl1" VerticalAlignment="Top" Height="550" Width="389">
<TextBox Height="72" HorizontalAlignment="Left" Margin="166,339,0,0" Name="textBox1" Text="TextBox" VerticalAlignment="Top" Width="460" />
</my:MyControl>
Here's the MyControl.xaml
<ContentControl x:Class="ContentControlTest.MyControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}"
d:DesignHeight="480" d:DesignWidth="480">
<StackPanel x:Name="LayoutRoot" Background="{StaticResource PhoneChromeBrush}" Orientation="Vertical">
<ContentPresenter/>
<Button Content="Button" Height="72" HorizontalAlignment="Left" Margin="78,254,0,0" Name="FooFoo" VerticalAlignment="Bottom" Width="160" />
</StackPanel>
</ContentControl>
And here is the MyControl.cs
using System.Windows.Controls;
namespace ContentControlTest
{
public partial class MyControl : ContentControl
{
public MyControl()
{
InitializeComponent();
}
}
}
The way I thought it worked was that the child elements of the control instance are set as the Content property on the ContentControl base class of MyControl. Then, ContentPresenter "pastes" that content into the MyControl.xaml wherever appears.
Although that does seem to be how it works, in the process it is "eating" the Button that I have defined in the MyControl.xaml.
I'm trying not to get into ControlTemplate etc that at this point unless it is absolutely necessary.
Can someone with a clue please tell me what I am doing wrong.
thanks!
That's because the Content of the control is the entire StackPanel you've written by hand; when you set a new Content, the StackPanel is replaced.
A ControlTemplate is necessary for this scenario, I think; it would be a very simple one after all. The starting point can be the default style of the content control; put the style inside a ResourceDictionary (for instance, in the <ContentControl.Resources> section of your user control), and you're ready to go; all you need to do is add a grid and button inside that template.
Note that the style I linked to sets itself as the default for any reachable ContentControl; to make it only apply to your control and not to any children that may appear inside it, add x:Key="someKey" to the Style and set the ContentControl's Style property explicitly to Style={StaticResource someKey}.
Let me know if you need additional information; also, I might be wrong and there may be an easier way, but I doubt it; the Content property is meant to behave exactly like what you described.