C#•3y ago

✅ WPF Custom control should have contents as DockPanel, but it shows up at runtime as ScrollViewer

I have a

UserControl

UserControl

UserControl

UserControl I'm implementing with the source shown below. When I check my custom controls

Content

Content

Content

Content property, the value is a

ScrollViewer

ScrollViewer

ScrollViewer

ScrollViewer. What's going on? I expected a

DockPanel

DockPanel

DockPanel

DockPanel.

<Base:AbstractVisualConversationTabCtrl
    x:Class="BestChat.IRC.Global.View.Ctrls.ConversationViewCtrl"
    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:local="clr-namespace:BestChat.IRC.Global.View.Ctrls"
    xmlns:Base="clr-namespace:BestChat.GUI.Ctrls;assembly=BestChat.GUI.Ctrls"
    xmlns:data="BestChat.Platform.Conversations;Assembly=BestChat.Platform.Conversations"
    mc:Ignorable="d"
    xmlns:CalcBinding="clr-namespace:CalcBinding;assembly=CalcBinding">
    <Base:AbstractVisualConversationTabCtrl.Resources>
        <Style
            x:Key="ChkBoxStyle"
            TargetType="CheckBox"
            BasedOn="{StaticResource {x:Static ToolBar.ToggleButtonStyleKey}}" />
    </Base:AbstractVisualConversationTabCtrl.Resources>
    <DockPanel>
        <WrapPanel
            x:Name="wrapDataBar"
            DockPanel.Dock="Top" />
        <Border
            Background="Black" />
    </DockPanel>
</Base:AbstractVisualConversationTabCtrl>

<Base:AbstractVisualConversationTabCtrl
    x:Class="BestChat.IRC.Global.View.Ctrls.ConversationViewCtrl"
    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:local="clr-namespace:BestChat.IRC.Global.View.Ctrls"
    xmlns:Base="clr-namespace:BestChat.GUI.Ctrls;assembly=BestChat.GUI.Ctrls"
    xmlns:data="BestChat.Platform.Conversations;Assembly=BestChat.Platform.Conversations"
    mc:Ignorable="d"
    xmlns:CalcBinding="clr-namespace:CalcBinding;assembly=CalcBinding">
    <Base:AbstractVisualConversationTabCtrl.Resources>
        <Style
            x:Key="ChkBoxStyle"
            TargetType="CheckBox"
            BasedOn="{StaticResource {x:Static ToolBar.ToggleButtonStyleKey}}" />
    </Base:AbstractVisualConversationTabCtrl.Resources>
    <DockPanel>
        <WrapPanel
            x:Name="wrapDataBar"
            DockPanel.Dock="Top" />
        <Border
            Background="Black" />
    </DockPanel>
</Base:AbstractVisualConversationTabCtrl>

<Base:AbstractVisualConversationTabCtrl
    x:Class="BestChat.IRC.Global.View.Ctrls.ConversationViewCtrl"
    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:local="clr-namespace:BestChat.IRC.Global.View.Ctrls"
    xmlns:Base="clr-namespace:BestChat.GUI.Ctrls;assembly=BestChat.GUI.Ctrls"
    xmlns:data="BestChat.Platform.Conversations;Assembly=BestChat.Platform.Conversations"
    mc:Ignorable="d"
    xmlns:CalcBinding="clr-namespace:CalcBinding;assembly=CalcBinding">
    <Base:AbstractVisualConversationTabCtrl.Resources>
        <Style
            x:Key="ChkBoxStyle"
            TargetType="CheckBox"
            BasedOn="{StaticResource {x:Static ToolBar.ToggleButtonStyleKey}}" />
    </Base:AbstractVisualConversationTabCtrl.Resources>
    <DockPanel>
        <WrapPanel
            x:Name="wrapDataBar"
            DockPanel.Dock="Top" />
        <Border
            Background="Black" />
    </DockPanel>
</Base:AbstractVisualConversationTabCtrl>

<Base:AbstractVisualConversationTabCtrl
    x:Class="BestChat.IRC.Global.View.Ctrls.ConversationViewCtrl"
    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:local="clr-namespace:BestChat.IRC.Global.View.Ctrls"
    xmlns:Base="clr-namespace:BestChat.GUI.Ctrls;assembly=BestChat.GUI.Ctrls"
    xmlns:data="BestChat.Platform.Conversations;Assembly=BestChat.Platform.Conversations"
    mc:Ignorable="d"
    xmlns:CalcBinding="clr-namespace:CalcBinding;assembly=CalcBinding">
    <Base:AbstractVisualConversationTabCtrl.Resources>
        <Style
            x:Key="ChkBoxStyle"
            TargetType="CheckBox"
            BasedOn="{StaticResource {x:Static ToolBar.ToggleButtonStyleKey}}" />
    </Base:AbstractVisualConversationTabCtrl.Resources>
    <DockPanel>
        <WrapPanel
            x:Name="wrapDataBar"
            DockPanel.Dock="Top" />
        <Border
            Background="Black" />
    </DockPanel>
</Base:AbstractVisualConversationTabCtrl>

Will PittengerOP•11/5/23, 10:08 PM

I'm debating trying to convert the WrapPanelWrapPanel into a ItemsControlItemsControl. The catch is I'd need to create a Template Selector. I'm letting it bake for a while.

Will PittengerOP•11/6/23, 4:25 AM

It's now coded and compiles, but haven't gotten to testing it yet. Need to put a few more pieces in first.

Will PittengerOP•11/6/23, 7:10 AM

Well, the code runs just fine. Took two ItemsControlItemsControl instances each needing a Template Selector. However, I still have the Live Property Explorer reporting the contents of my user control is a

ScrollViewer

ScrollViewer

rather than a

DockPanel

DockPanel

. The problem is I'm trying to figure out why the controls I was adding on the fly (now done with the ItemsControlItemsControl weren't showing up.

Will PittengerOP•11/6/23, 9:01 AM

Looks like my

DockPanel

DockPanel

was created, but not added to the tree. I checked the VisualParentVisualParent property. It was

null

null

Will PittengerOP•11/6/23, 9:05 AM

Well, I'm giving up for now and calling it a night.

Will PittengerOP•11/7/23, 6:31 AM

I finally figured out what was going on. A couple months ago,, I wrote a base class (that I derived from a couple times) that created the

ScrollViewer

ScrollViewer

. I found it by searching for "ScrollViewer" in my files. Until a few hours ago, I was thinking it would appear only in a XAML file. But this was in a class that didn't have a XAML as it was abstractabstract and I was going to have the derived class provide the XAML. But for some strange reason I don't remember, I put the

ScrollViewer

ScrollViewer

in the CS file's OnInitializedOnInitialized which promptly erased the contents from the XAML. In some situations, I'll want all views to have a

ScrollViewer

ScrollViewer

as the content of the window with its content provided provided by an implementation. But in this situation, the derived class will be providing what you could think of as the "non-client" area never mind this isn't a WindowWindow. Basically, some versions will be adding a bar along the top. At least I know what was going on. I'm considering moving things around a bit.

Will PittengerOP•11/7/23, 6:34 AM

As is, I put a CtntsCtnts property into the abstractabstract class and mapped it to the

ScrollViewer

ScrollViewer

Content

Content

property. I may simply change that so there's a panel that's hidden unless it receives content. What I called CtntsCtnts would be renamed HdrHdr and mapped to the new panel's

Content

Content

property.

Will PittengerOP•11/7/23, 6:35 AM

The branch of the control's derived classes I was working on will generate a list of contents for the

ScrollViewer

ScrollViewer

as was always the plan.

✅ WPF Custom control should have contents as DockPanel, but it shows up at runtime as ScrollViewer

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