How do I check whether the "X" button in the top right corner was clicked on a WPF form? - WPF Discussion Boards

Re: Catastrophic failure while running thread with BackgroundWorker

salon22-Jun-09 21:16

22-Jun-09 21:16

I got a link http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.cancellationpending%28VS.95%29.aspx[^]

I have written

if ((worker.CancellationPending == true))
        {
            e.Cancel = true;

        }

in bw_DoWork(object sender, DoWorkEventArgs e)
but still getting the same exception.

I think this is because bw_DoWork not getting that the browser is getting closed.

How can I tell it that? Do I have some flag so that it is conveyed to this event that browser is getting closed?

ListBox Binding From Within A User Control

BlitzPackage21-Jun-09 14:56

BlitzPackage

21-Jun-09 14:56

Good people,

I have a listbox embedded within a user control.   The user control is then housed within a data template.   I have created a dependency property for the user control; the type of this property is an observable collection that is intended to be the source of items for the listbox.

The difficulty I am having is that the listbox will not display the items when the user control is part of the datatemplate.   It will display items when it is not part of the data template.   I am pasting code below.   Any help, advice or information would be really helpful.   Thanks in advance.

Here is the code for the list box as it is in the user control.
<pre>
<ListBox SelectionChanged="ListBoxImages_SelectionChanged" IsSynchronizedWithCurrentItem="True" Margin="8,40.76,8,174.91" x:Name="ListBoxImages" Grid.Row="1" ItemsSource="{Binding Path=Photos, ElementName=UCAscensionImageManagement, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" ItemTemplate="{DynamicResource DataTemplateImageList}">
          </ListBox>
</pre>

This is the user control, that contains the listbox.   It is in a datatemplate.
<pre>
<SG2_Ascension:UserControlAscensionImageManagement Margin="21.234,0,17.733,54" VerticalAlignment="Bottom" Height="475" x:Name="UCAIMEventPhotos" Width="615" Photos="{Binding Path=UCGeneralDataSeries, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>

Finally, this is the dependency property as it is coded in the user control
<pre>
public static DependencyProperty PhotosProperty = DependencyProperty.Register(
                  "Photos", typeof(GeneralDataSeries), typeof(UserControlAscensionImageManagement)/*,
                  new FrameworkPropertyMetadata(new PropertyChangedCallback(OnRatingChanged))*/
                                                                                                                                    );
            /// <summary>
            /// Photo objects.
            /// </summary>
            public GeneralDataSeries Photos
            {
                  get
                  {
                        return (GeneralDataSeries)GetValue(PhotosProperty);
                  }
                  set
                  {
                        SetValue(PhotosProperty, value);
                  }
            }
</pre>

Again, any help would be greatly appreciated.

Re: ListBox Binding From Within A User Control

Mark Salsbery21-Jun-09 16:38

Mark Salsbery

21-Jun-09 16:38

On the ListBox you have

ItemsSource="{Binding Path=Photos, <code>ElementName=UCAscensionImageManagement</code>, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"

In the usercontrol you have

x:<code>Name="UCAIMEventPhotos"</code> Photos="{Binding Path=UCGeneralDataSeries, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"

I assume you mean to bind the ListBox ItemsSource to the UserControl Photos
property, correct?

If so, you used the wrong ElementName in the ListBox ItemsSource binding.

You could also try something like this:

ItemsSource="{Binding Path=Photos, RelativeSource={RelativeSource AncestorType={x:Type SG2_Ascension:UserControlAscensionImageManagement}}, Mode=OneWay}"

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: ListBox Binding From Within A User Control

BlitzPackage21-Jun-09 17:08

BlitzPackage

21-Jun-09 17:08

Thanks Mark,

It seems you are on to the solution.   The only error it's giving me is that it says "the type reference cannot find a public type named 'UserControlAscensionImageManagement'.

This is unexpected since the listbox, and thus this declaration, is occurring within the UserControlAscensionImageManagement XAML file.   Wow!

At any rate, let me know if you have any additional thoughts.   I am continuing to work on finding a solution on my end.

Thanks for any additional information you can provide.

Re: ListBox Binding From Within A User Control

Mark Salsbery21-Jun-09 17:45

Mark Salsbery

21-Jun-09 17:45

BlitzPackage wrote:
The only error it's giving me is that it says "the type reference cannot find a public type named 'UserControlAscensionImageManagement'.

Even after a rebuild?

Is the class marked public?

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: ListBox Binding From Within A User Control

BlitzPackage21-Jun-09 17:55

BlitzPackage

21-Jun-09 17:55

Hmmmm...haven't tried a rebuild. Also, yes the class is marked public. I will try a rebuild shortly.

Rebuilds usually erase all of my test data in the database and force me to start from scratch. However, I will try it and let you know.

Thanks again.

Re: ListBox Binding From Within A User Control

Mark Salsbery21-Jun-09 18:01

Mark Salsbery

21-Jun-09 18:01

BlitzPackage wrote:
Rebuilds usually erase all of my test data in the database and force me to start from scratch.

hmm ok. That doesn't sound like a friendly environment for WPF development...

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

How do I check whether the "X" button in the top right corner was clicked on a WPF form?

Etienne_12321-Jun-09 11:54

Etienne_123

21-Jun-09 11:54

I need to shut down the entire application when the user clicks this button, but I don't know how to check if the window was closed via the "X" button or some other button.
Apologies for cross posting this topic.

Re: How do I check whether the "X" button in the top right corner was clicked on a WPF form?

Christian Graus21-Jun-09 12:10

Christian Graus

21-Jun-09 12:10

Didn't this get an answer the other day ? Handle the form closing event and the event args will tell you what caused the form to close.

Christian Graus

Driven to the arms of OSX by Vista.

"! i don't exactly like or do programming and it only gives me a headache." - spotted in VB forums.

I can do things with my brain that I can't even google. I can flex the front part of my brain instantly anytime I want. It can be exhausting and it even causes me vision problems for some reason. - CaptainSeeSharp

How do you display separator bars in a StatusBar?

fjparisIII21-Jun-09 8:27

fjparisIII

21-Jun-09 8:27

I've been trying for an hour and can't get them to show up. I want three TextBlock fields in the StatusBar, each separated by a Separator. The TextBlock fields show up fine. I want the middle field to to be centered and take up all the space that the left and right fields do not, and my XAML does achieve this. Here is that XAML. I tried an explicit width of 10 for the two Separator elements, but that didn't make a difference. What am I doing wrong?

<StatusBar
    Grid.Row="1"
    DockPanel.Dock="Bottom"
    Height="23"
    VerticalAlignment="Bottom"
    BorderBrush="Black"
    BorderThickness="0,.5,0,0"
    >
    <StatusBar.ItemsPanel>
        <ItemsPanelTemplate>
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="Auto"></ColumnDefinition>
                    <ColumnDefinition Width="Auto"></ColumnDefinition>
                    <ColumnDefinition Width="*"></ColumnDefinition>
                    <ColumnDefinition Width="Auto"></ColumnDefinition>
                    <ColumnDefinition Width="Auto"></ColumnDefinition>
                </Grid.ColumnDefinitions>
            </Grid>
        </ItemsPanelTemplate>
    </StatusBar.ItemsPanel>
    <StatusBarItem
        Grid.Column="0"
        >
        <TextBlock
            Name="statusBarHelp"
            >
        </TextBlock>
    </StatusBarItem>
    <StatusBarItem
        Grid.Column="1"
        >
        <Separator></Separator>
    </StatusBarItem>
    <StatusBarItem
        Grid.Column="2"
        HorizontalContentAlignment="Center"
        >
        <TextBlock
            Name="statusBarFullPath"
            >
        </TextBlock>
    </StatusBarItem>
    <StatusBarItem
        Grid.Column="3"
        >
        <Separator></Separator>
    </StatusBarItem>
    <StatusBarItem
        Grid.Column="4"
        >
        <TextBlock
            Name="imageCount"
            Padding="0,0,10,0"
            >
        </TextBlock>
    </StatusBarItem>
</StatusBar>

Re: How do you display separator bars in a StatusBar?

Christian Graus21-Jun-09 10:05

Christian Graus

21-Jun-09 10:05

If you want seperators, why not add them as a border on the controls, you can specify different widths for the border, so put 10,0 on the middle one to get 10 on each side. Otherwise, I expect you'd need to specify widths on the seperator itself, and specify a width of 10 on your column definition.

WPF is a PITA, it's way too hard to get stuff to appear at the size you asked for.

Re: How do you display separator bars in a StatusBar?

fjparisIII21-Jun-09 11:09

fjparisIII

21-Jun-09 11:09

Christian Graus wrote:
If you want seperators, why not add them as a border on the controls

Borders on the controls are a last resort possibility, but my question was, why don't the Separator elements show up? I shouldn't have to specify a width on them, as their constructor should specify a default width. In no other code I've ever seen do you have to specify a width for a Separator.

But I experimented by setting a width and was shocked to discover that the Separator in a StatusBar is a horizontal line, not a vertical line as one should expect. One should expect that, right? I suppose a horizontal line will work, but I wonder who's brilliant idea it was at Microsoft to make a Separator a horizontal line in a WPF StatusBar? Isn't that totally nonstandard? You'd expect horizontal lines only between items arranged vertically, like the separators between menu items.

Christian Graus wrote:
I expect you'd need to specify widths on the seperator itself, and specify a width of 10 on your column definition.

I tried an explicit width on the column definition and it didn't work, so went back to Width="Auto". When I specified a width on the separator itself, that's when I discovered the very strange thing that the Microsoft developer has done, in making separators horizontal lines in status bars instead of vertical lines. This almost seems like a bug to me. I should just put a vertical bar in there.

Re: How do you display separator bars in a StatusBar?

Mark Salsbery21-Jun-09 11:13

Mark Salsbery

21-Jun-09 11:13

fjparisIII wrote:
I wonder who's brilliant idea it was at Microsoft to make a Separator a horizontal line in a WPF StatusBar?

It isn't. It's orientation is based on the ItemsControl it is used as an item in.

You didn't use them as ItemsControl items so you got the default horizontal
orientation.

See my other replies for two ways you can use the separators in a more correct fashion.

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: How do you display separator bars in a StatusBar? (Ans: don't use them)

fjparisIII21-Jun-09 11:26

fjparisIII

21-Jun-09 11:26

I took the Separator elements out. Those horizontal lines just look like a kludge.

Re: How do you display separator bars in a StatusBar? (Ans: don't use them)

Mark Salsbery21-Jun-09 11:29

Mark Salsbery

21-Jun-09 11:29

fjparisIII wrote:
I took the Separator elements out.

Why would you take the separator elements out if you want separators?

I gave you two working examples - one that you can totally customize
the style of the separators, and another that uses the default style.

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: How do you display separator bars in a StatusBar? (Ans: don't use them)

fjparisIII21-Jun-09 11:51

fjparisIII

21-Jun-09 11:51

Mark Salsbery wrote:
Why would you take the separator elements out if you want separators?

I gave you two working examples - one that you can totally customize
the style of the separators, and another that uses the default style.

I took them out before I saw your examples. After I saw your second example, I put them back in. Now they look great. Thanks for your attention.

Re: How do you display separator bars in a StatusBar? [modified]

Mark Salsbery21-Jun-09 10:50

Mark Salsbery

21-Jun-09 10:50

*Edit*
With your Separators wrapped in StatusBarItem, they default to a horizontal orientation, so
you'd need to give your separators a vertically oriented style, otherwise you can't see them...

<StatusBar Grid.Row="1"
           DockPanel.Dock="Bottom"
           Height="23"
           VerticalAlignment="Bottom"
           BorderBrush="Black"
           BorderThickness="0,.5,0,0" >
    <StatusBar.ItemsPanel>
        <ItemsPanelTemplate>
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="Auto"></ColumnDefinition>
                    <ColumnDefinition Width="Auto"></ColumnDefinition>
                    <ColumnDefinition Width="*"></ColumnDefinition>
                    <ColumnDefinition Width="Auto"></ColumnDefinition>
                    <ColumnDefinition Width="Auto"></ColumnDefinition>
                </Grid.ColumnDefinitions>
            </Grid>
        </ItemsPanelTemplate>
    </StatusBar.ItemsPanel>
    <StatusBarItem Grid.Column="0" >
        <TextBlock Text="TextBlock 1" Name="statusBarHelp" />
    </StatusBarItem>
    <StatusBarItem Grid.Column="1" >
        <Separator >
            <Separator.Style>
                <Style TargetType="{x:Type Separator}">
                    <Setter Property="Height" Value="20"/>
                    <Setter Property="Margin" Value="2,0,2,0"/>
                    <Setter Property="Focusable" Value="false"/>
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="{x:Type Separator}">
                                <Border BorderBrush="LightSlateGray" BorderThickness="1"/>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </Separator.Style>
        </Separator>
    </StatusBarItem>
    <StatusBarItem Grid.Column="2" HorizontalContentAlignment="Center" >
        <TextBlock Text="TextBlock 2" Name="statusBarFullPath" />
    </StatusBarItem>
    <StatusBarItem Grid.Column="3" >
        <Separator >
            <Separator.Style>
                <Style TargetType="{x:Type Separator}">
                    <Setter Property="Height" Value="20"/>
                    <Setter Property="Margin" Value="2,0,2,0"/>
                    <Setter Property="Focusable" Value="false"/>
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="{x:Type Separator}">
                                <Border BorderBrush="LightSlateGray" BorderThickness="1"/>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </Separator.Style>
        </Separator>
    </StatusBarItem>
    <StatusBarItem Grid.Column="4" >
        <TextBlock Text="TextBlock 3" Name="imageCount" />
    </StatusBarItem>
</StatusBar>

In my second reply is a simpler version with the StatusBarItem wrappers removed.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

modified on Sunday, June 21, 2009 5:06 PM

Re: How do you display separator bars in a StatusBar?

Christian Graus21-Jun-09 10:51

Christian Graus

21-Jun-09 10:51

Shouldn't that style then be a template, so it gets reused ? :P

OK, so a seperator is invisible without a style ? I've never used one, so I had no idea about that.

Re: How do you display separator bars in a StatusBar?

Mark Salsbery21-Jun-09 11:04

Mark Salsbery

21-Jun-09 11:04

Christian Graus wrote:
a seperator is invisible without a style ?

I worded the reply incorrectly.

I meant the way the op is using it, it is not visible.

I'll reply to OP again Poke tongue | ;-P

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: How do you display separator bars in a StatusBar?

Mark Salsbery21-Jun-09 11:09

Mark Salsbery

21-Jun-09 11:09

Christian Graus wrote:
Shouldn't that style then be a template, so it gets reused ?

That exercise is left to the reader Poke tongue | ;-P

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: How do you display separator bars in a StatusBar?

Mark Salsbery21-Jun-09 11:05

Mark Salsbery

21-Jun-09 11:05

To use the default Separator style, remove the StatusBarItem
wrappers from the Separators:

<StatusBar Grid.Row="1"
           DockPanel.Dock="Bottom"
           Height="23"
           VerticalAlignment="Bottom"
           BorderBrush="Black"
           BorderThickness="0,.5,0,0" >
    <StatusBar.ItemsPanel>
        <ItemsPanelTemplate>
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="Auto"></ColumnDefinition>
                    <ColumnDefinition Width="Auto"></ColumnDefinition>
                    <ColumnDefinition Width="*"></ColumnDefinition>
                    <ColumnDefinition Width="Auto"></ColumnDefinition>
                    <ColumnDefinition Width="Auto"></ColumnDefinition>
                </Grid.ColumnDefinitions>
            </Grid>
        </ItemsPanelTemplate>
    </StatusBar.ItemsPanel>
    <StatusBarItem Grid.Column="0" >
        <TextBlock Text="TextBlock 1" Name="statusBarHelp" />
    </StatusBarItem>
    <Separator Grid.Column="1"  />
    <StatusBarItem Grid.Column="2" HorizontalContentAlignment="Center" >
        <TextBlock Text="TextBlock 2" Name="statusBarFullPath" />
    </StatusBarItem>
    <Separator Grid.Column="3" />
    <StatusBarItem Grid.Column="4" >
        <TextBlock Text="TextBlock 3" Name="imageCount" />
    </StatusBarItem>
</StatusBar>

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: How do you display separator bars in a StatusBar?

fjparisIII21-Jun-09 11:40

fjparisIII

21-Jun-09 11:40

Okay, now we're talking. Good answer. Thanks, Mark. Looks good. I just make them invisible when the middle TextBlock is empty. Sure was a lot of screwing around for a lousy pair of Separator elements.

How to find the temparary drives created

Nekkantidivya19-Jun-09 20:45

Nekkantidivya

19-Jun-09 20:45

Hi,

I am working on a WPF application. In this I need to find the temporary drives created i.e., like drives created when some mobile or pen drive are created. From this Temporary drive created I need to get the image files.

If any one have any idea to get the names or path of the temparory drives created please reply me.

Thanks in advance.

Re: How to find the temparary drives created

ABitSmart19-Jun-09 21:51

ABitSmart

19-Jun-09 21:51

This is not a WPF question.

Take a look at DriveInfo class[^], especially DriveInfo.GetDrives[^]. You can check for the Drive having DriveType as DriveType.Removable.

[Message Deleted]

CBenac19-Jun-09 14:11

CBenac

19-Jun-09 14:11

[Message Deleted]

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.