Exposing contained control properties from within a custom control


  1.    10 Apr 2008 #1
    Martin Robins Guest

    Exposing contained control properties from within a custom control


    I am trying to create a custom control that can be used to present a common look and feel within my application. My first start is to try and create a basic dialog using the following xaml ...

    <Style TargetType="{x:Type localialogBase}">
    <Setter Property="Template">
    <Setter.Value>
    <ControlTemplate TargetType="{x:Type localialogBase}">
    <Border Background="{TemplateBinding Background}"
    BorderBrush="{TemplateBinding BorderBrush}"
    BorderThickness="{TemplateBinding BorderThickness}">
    <Grid>
    <Grid.RowDefinitions>
    <RowDefinition />
    <RowDefinition Height="Auto"/>
    </Grid.RowDefinitions>
    <DockPanel Grid.Row="0" Margin="5">
    <TabControl Name="PART_TabControl"/>
    </DockPanel>

    <DockPanel Grid.Row="1" LastChildFill="False" HorizontalAlignment="Right" Margin="5">
    <Button IsDefault="True">OK</Button>
    <Button IsCancel="True">Cancel</Button>
    </DockPanel>
    </Grid>
    </Border>
    </ControlTemplate>
    </Setter.Value>
    </Setter>
    </Style>

    I want to expose the Items property of the TabControl as the default property when I use this control so that I can use it like ...

    <myialogBase ...>
    <TabItem .../>
    <TabItem.../>
    </myialogBase>

    I simply cannot work out how to do it (I am very new to WPF).

    I have tried the following in code

    namespace WpfCustomControlLibrary {
    #region Namespace references
    using System;
    using System.Windows;
    using System.Windows.Markup;
    using System.Windows.Controls;
    using System.ComponentModel;
    using System.Windows.Input;
    using System.Collections.ObjectModel;
    #endregion
    [DefaultProperty("Items"), ContentProperty("Items")]
    public class DialogBase : Window {
    #region Fields
    private TabControl tabControl;
    #endregion
    #region Constructor
    static DialogBase() {
    DefaultStyleKeyProperty.OverrideMetadata(typeof(DialogBase), new FrameworkPropertyMetadata(typeof(DialogBase)));
    }
    #endregion
    [Bindable(true), DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
    public ItemCollection Items {
    get { return this.tabControl.Items; }
    }
    #region Methods
    public override void OnApplyTemplate() {
    base.OnApplyTemplate();
    this.tabControl = this.Template.FindName("PART_TabControl", this) as TabControl;
    }
    public Nullable<bool> ShowDialog(Window owner) {
    this.Owner = owner;
    return this.ShowDialog();
    }
    #endregion
    }
    }

    But this fails because WPF attempts to merge the control xaml with the inner xaml before the OnApplyTemplate can work; therefore I end up with null reference exceptions because I cannot reference the tab control before the xaml is merged.

    I am sure there is an easy way to do this but I cannot find it - and I have spent some considerable time on experiments and Google.

    Anybody care to share?


    Thanks


    Martin.
      My System SpecsSystem Spec

  2.    10 Apr 2008 #2
    Martin Robins Guest

    Re: Exposing contained control properties from within a custom control


    Please refer to my repost rather than answer on this thread. Sorry; I missed a group in this post so I have reposted.
    "Martin Robins" <martin at orpheus-solutions dot co dot uk> wrote in message news:eo9CwoxmIHA.6064@xxxxxx
    I am trying to create a custom control that can be used to present a common look and feel within my application. My first start is to try and create a basic dialog using the following xaml ...

    <Style TargetType="{x:Type localialogBase}">
    <Setter Property="Template">
    <Setter.Value>
    <ControlTemplate TargetType="{x:Type localialogBase}">
    <Border Background="{TemplateBinding Background}"
    BorderBrush="{TemplateBinding BorderBrush}"
    BorderThickness="{TemplateBinding BorderThickness}">
    <Grid>
    <Grid.RowDefinitions>
    <RowDefinition />
    <RowDefinition Height="Auto"/>
    </Grid.RowDefinitions>
    <DockPanel Grid.Row="0" Margin="5">
    <TabControl Name="PART_TabControl"/>
    </DockPanel>

    <DockPanel Grid.Row="1" LastChildFill="False" HorizontalAlignment="Right" Margin="5">
    <Button IsDefault="True">OK</Button>
    <Button IsCancel="True">Cancel</Button>
    </DockPanel>
    </Grid>
    </Border>
    </ControlTemplate>
    </Setter.Value>
    </Setter>
    </Style>

    I want to expose the Items property of the TabControl as the default property when I use this control so that I can use it like ...

    <myialogBase ...>
    <TabItem .../>
    <TabItem.../>
    </myialogBase>

    I simply cannot work out how to do it (I am very new to WPF).

    I have tried the following in code

    namespace WpfCustomControlLibrary {
    #region Namespace references
    using System;
    using System.Windows;
    using System.Windows.Markup;
    using System.Windows.Controls;
    using System.ComponentModel;
    using System.Windows.Input;
    using System.Collections.ObjectModel;
    #endregion
    [DefaultProperty("Items"), ContentProperty("Items")]
    public class DialogBase : Window {
    #region Fields
    private TabControl tabControl;
    #endregion
    #region Constructor
    static DialogBase() {
    DefaultStyleKeyProperty.OverrideMetadata(typeof(DialogBase), new FrameworkPropertyMetadata(typeof(DialogBase)));
    }
    #endregion
    [Bindable(true), DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
    public ItemCollection Items {
    get { return this.tabControl.Items; }
    }
    #region Methods
    public override void OnApplyTemplate() {
    base.OnApplyTemplate();
    this.tabControl = this.Template.FindName("PART_TabControl", this) as TabControl;
    }
    public Nullable<bool> ShowDialog(Window owner) {
    this.Owner = owner;
    return this.ShowDialog();
    }
    #endregion
    }
    }

    But this fails because WPF attempts to merge the control xaml with the inner xaml before the OnApplyTemplate can work; therefore I end up with null reference exceptions because I cannot reference the tab control before the xaml is merged.

    I am sure there is an easy way to do this but I cannot find it - and I have spent some considerable time on experiments and Google.

    Anybody care to share?


    Thanks


    Martin.
      My System SpecsSystem Spec

Exposing contained control properties from within a custom control

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