composite wpf - Page 61

Probably a simple question but: How do I programmatically change the color of an ellipse that is defined in XAML based on a variable? Everything I've read on binding is based on collections and lists -can't I set it simply (and literally) based on the value of a string variable? string color = "red" color = "#FF0000"

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WPF - ListView within listView Scrollbar problem

- by Josh

So I currently have a ListView "List A" who's items each have an expander control which contains another ListView "List B". The problem I am having is that sometimes List B grows so big that it extends beyond the range of List A's view area. List A's scroll bars do not pick up the fact that parts of List B are not being displayed. Is there a way to setup my xaml so that the scroll bars for List A will detect when the list inside the expander is longer then the viewing area of List A. Here is the section of code I need to modify: <TabItem Header="Finished"> <TabItem.Resources> <ResourceDictionary> <DataTemplate x:Key="EpisodeItem"> <DockPanel Margin="30,3"> <TextBlock Text="{Binding Title}" DockPanel.Dock="Left" /> <WrapPanel Margin="10,0" DockPanel.Dock="Right"> <TextBlock Text="Finished at: " /> <TextBlock Text="{Binding TimeAdded}" /> </WrapPanel> </DockPanel> </DataTemplate> <DataTemplate x:Key="AnimeItem"> <DockPanel Margin="5,10"> <Image Height="75" Width="Auto" Source="{Binding ImagePath}" DockPanel.Dock="Left" VerticalAlignment="Top"/> <Expander Template="{StaticResource AnimeExpanderControlTemplate}" > <Expander.Header> <TextBlock FontWeight="Bold" Text="{Binding AnimeTitle}" /> </Expander.Header> <ListView ItemsSource="{Binding Episodes}" ItemTemplate="{StaticResource EpisodeItem}" BorderThickness="0,0,0,0" /> </Expander> </DockPanel> </DataTemplate> </ResourceDictionary> </TabItem.Resources> <ListView Name="finishedView" ItemsSource="{Binding UploadedAnime, diagnostics:PresentationTraceSources.TraceLevel=High}" ItemTemplate="{StaticResource AnimeItem}" /> </TabItem> List A is the ListView with name "finishedView" and List B is the ListView with ItemSource "Episodes"

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WPF DataGrid Hide RowDetails or Unselect Row

- by Nate Zaugg

I have a DataGrid who's RowDetails is set to show when selected (RowDetailsVisibilityMode="VisibleWhenSelected"). Now I want to be able to get rid of it! I put a close button on the row details with this code: private void Button_Click(object sender, RoutedEventArgs e) { e.Handled = true; Button button = sender as Button; DataGridRow row = button.FindAncestor(); row.DetailsVisibility = Visibility.Collapsed; } That code gets me 90% there, but once the row details is collapsed for a given row it will not appear the next time that row is selected.

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WPF WriteableBitmap Memory Leak?

- by Mario

Hello, everyone! I'm trying to figure out how to release a WriteableBitmap memory. In the next section of code I fill the backbuffer of a WriteableBitmap with a really large amount of data from "BigImage" (3600 * 4800 px, just for testing) If I comment the lines where bitmap and image are equaled to null, the memory it´s not release and the application consumes ~230 MB, even when Image and bitmap are no longer used! As you can see at the end of the code its necessary to call GC.Collect() to release the memory. So the question is, what is the right way to free the memory used by a WriteableBitmap object? Is GC.Collect() the only way? Any help would be great. PS. Sorry for my bad english. private void buttonTest_Click(object sender, RoutedEventArgs e) { Image image = new Image(); image.Source = new BitmapImage(new Uri("BigImage")); WriteableBitmap bitmap = new WriteableBitmap( (BitmapSource)image.Source); bitmap.Lock(); // Bitmap processing bitmap.Unlock(); image = null; bitmap = null; GC.Collect(); }

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