itemcontainergenerator

ListBox ItemContainerGenerator returns null even when listbox has items

由 折月煮酒 提交于 2020-01-02 05:58:13
问题 I've a listbox with couple of items, till the time no scrollbar appears everything goes perfectly fine but once scrollbar comes then ItemContainerGenerator returns null. I read some blogs and found it may be because of vertualization stackpanel. If i disable that then it may work but in my case it would make listbox too much heavy and less efficient. Here is the code for listbox: <ListBox x:Name="EventListBox" DockPanel.Dock="Top" Margin="5,5,5,5" FocusVisualStyle="{x:Null}" ItemsSource="

wpf manually generate TreeViewItem container

由 北城余情 提交于 2019-12-20 03:19:50
问题 I am creating a TreeView at runtime. It has several nodes(TreeViewItem), each one having a name. Initially it is collapsed. A separate comboBox displays Names of all TreeViewItem. I have to highlight a TreeViewItem based on the Name selected. I am using a recursive function and gets the TreeViewItem container like this: if (parent.ItemContainerGenerator.Status != GeneratorStatus.ContainersGenerated) continue; TreeViewItem container = parent.ItemContainerGenerator.ContainerFromItem(child).As

Treeview ContainerFromItem always returns null

由 依然范特西╮ 提交于 2019-12-18 13:25:56
问题 I've read a few threads on this subject but couldn't find anything to do what I'm trying to do. I have a treeview that is bound to a hierarchical set of objects. Each of these objects represents an icon on a map. When the user clicks one of the icons on the map, I want to select the item in the tree view, focus on it, and scroll it into view. The map object has a list of the objects that are bound to the treeview. In the example, Thing is the type of object bound to the tree. public void

How to await the generation of containers in an ItemsControl?

由 拈花ヽ惹草 提交于 2019-12-11 15:20:26
问题 I have a SettingsWindow , in it there is an audio file selector which has a context menu. Some code accesses the MyAudioFileSelector computed property before it can get the AudioFileSelector because the AudioFileSelector is just inside a DataTemplate of an item in an ItemsControl that has not yet generated its containers at that moment. I tried to deffer the access to MyAudioFileSelector using Dispatcher.BeginInvoke with DispatcherPrority.Loaded , but the item containers are still not yet

WPF: how to recreate ItemContainer?

由 有些话、适合烂在心里 提交于 2019-12-11 05:27:32
问题 Following my previous question How to change ComboBox item visibility, since the problem is slightly changed i decided to open a new post to solve the it. For those who don't want to read all the comments on the previous post, here is the situation. I have a DataGrid that is generated at run time. Each column of this datagrid have a combobox inside the header. All those comboboxes have the same Source, that is an observable collection of a class item. Every item show a property that i use in

ListBox ItemContainerGenerator returns null even when listbox has items

由 你。 提交于 2019-12-05 14:18:57
I've a listbox with couple of items, till the time no scrollbar appears everything goes perfectly fine but once scrollbar comes then ItemContainerGenerator returns null. I read some blogs and found it may be because of vertualization stackpanel. If i disable that then it may work but in my case it would make listbox too much heavy and less efficient. Here is the code for listbox: <ListBox x:Name="EventListBox" DockPanel.Dock="Top" Margin="5,5,5,5" FocusVisualStyle="{x:Null}" ItemsSource="{Binding EventModelViewCollectionView}" Style="{StaticResource DefaultListBoxStyle}" ItemTemplate="

wpf manually generate TreeViewItem container

由 孤街浪徒 提交于 2019-12-02 01:34:16
I am creating a TreeView at runtime. It has several nodes(TreeViewItem), each one having a name. Initially it is collapsed. A separate comboBox displays Names of all TreeViewItem. I have to highlight a TreeViewItem based on the Name selected. I am using a recursive function and gets the TreeViewItem container like this: if (parent.ItemContainerGenerator.Status != GeneratorStatus.ContainersGenerated) continue; TreeViewItem container = parent.ItemContainerGenerator.ContainerFromItem(child).As<TreeViewItem>(); but it is parent.ItemContainerGenerator.Status = GeneratorStatus.NotStarted for all the

ItemContainerGenerator.ContainerFromItem() returns null while VirtualizingStackPanel.IsVirtualizing=“False”

由 喜夏-厌秋 提交于 2019-12-01 06:28:04
I'm facing a similar problem with this question however VirtualizingStackPanel.IsVirtualizing="False" didn't solve my problem. Is there anyone facing the same issue? The thing is I have a custom combobox, <Style TargetType="{x:Type MultiSelectionComboBox}" > <Setter Property="VerticalContentAlignment" Value="Center"/> <Setter Property="ItemsPanel"> <Setter.Value> <ItemsPanelTemplate> <StackPanel Orientation="Vertical" VerticalAlignment="Center" HorizontalAlignment="Center" VirtualizingStackPanel.IsVirtualizing="False"/> </ItemsPanelTemplate> </Setter.Value> </Setter> <Setter Property=

ItemContainerGenerator.ContainerFromItem() returns null while VirtualizingStackPanel.IsVirtualizing=“False”

由 生来就可爱ヽ(ⅴ＜●) 提交于 2019-12-01 04:43:54
问题 I'm facing a similar problem with this question however VirtualizingStackPanel.IsVirtualizing="False" didn't solve my problem. Is there anyone facing the same issue? The thing is I have a custom combobox, <Style TargetType="{x:Type MultiSelectionComboBox}" > <Setter Property="VerticalContentAlignment" Value="Center"/> <Setter Property="ItemsPanel"> <Setter.Value> <ItemsPanelTemplate> <StackPanel Orientation="Vertical" VerticalAlignment="Center" HorizontalAlignment="Center"

Treeview ContainerFromItem always returns null

由 喜你入骨 提交于 2019-11-30 09:35:35
I've read a few threads on this subject but couldn't find anything to do what I'm trying to do. I have a treeview that is bound to a hierarchical set of objects. Each of these objects represents an icon on a map. When the user clicks one of the icons on the map, I want to select the item in the tree view, focus on it, and scroll it into view. The map object has a list of the objects that are bound to the treeview. In the example, Thing is the type of object bound to the tree. public void ScrollIntoView(Thing t) { if (t != null) { t.IsSelected = true; t.IsExpanded = true; TreeViewItem container
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