how do you use TemplateBinding with a Width(double) property with a "*" or "Auto" on a new DependencyProperty?

10-06-2008 4:48 PM |

 I have a control that has a DependencyProperty that sets a width.  It is a double so setting actual values works just fine.  But my problem is I want to be able to set percentages and Auto but I am bombing out on it.... here is the code, the property is PanelWidth...

// other control code

public static readonly DependencyProperty PanelWidthProperty = DependencyProperty.Register("PanelWidth", typeof(double), typeof(SomeControl), null);
public double PanelWidth
{
    get { return (double)GetValue(PanelWidthProperty); }
    set { SetValue(PanelWidthProperty, value); }
}

// other control code 

<!-- in generic.xaml -->

<Style TargetType="cyc:SomeControl">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="cyc:SomeControl">
                    <Grid x:Name="RootElement">
                        <Canvas x:Name="PanelElement" Width="{TemplateBinding PanelWidth}">
                        </Canvas>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

 

I set 'PanelElement's Width == PanelWidth.  This is fine if the PanelWidth is an actual number but not Auto(NaN) or %s....  So my question is, how do I properly create the DependencyProperty or PanelWidth property to allow for NaNs or %s?

Thanks much!

--Brad

Re: how do you use TemplateBinding with a Width(double) property with a "*" or "Auto" on a new DependencyProperty?

10-07-2008 12:06 PM |

 *shameless bump*

To go into more depth incase I worded the quesstion badly(which I normally do), Say I were to add this line in the xaml:

<!-- in generic.xaml -->

<Style TargetType="cyc:SomeControl">

<Setter Property="PanelWidth" Value="Auto"/> 

        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="cyc:SomeControl">
                    <Grid x:Name="RootElement">
                        <Canvas x:Name="PanelElement" Width="{TemplateBinding PanelWidth}">
                        </Canvas>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

The line "<Setter Property="PanelWidth" Value="Auto"/>" will not work because of PanelWidth being a double.... is there a way to create a custom property and set it as Auto?

Thanks again,

Brad

Re: how do you use TemplateBinding with a Width(double) property with a &quot;*&quot; or &quot;Auto&quot; on a new DependencyProperty?

10-08-2008 8:48 AM |

 Hi xsirxx,

there is optiong to set width to auto you can use

like

double PanelWidth = double.NAN;

Re: how do you use TemplateBinding with a Width(double) property with a &quot;*&quot; or &quot;Auto&quot; on a new DependencyProperty?

10-08-2008 10:51 PM |

 PERFECT Yi-Lun Luo!  That should work great!  You always know the answers!

Thanks very much,

Brad