Re: ListView Scrolling with MVVM - WPF Discussion Boards

3-Sep-10 2:00

One way to do it is to use VisualTreeHelper.GetDescendantBounds on the root element in the window.

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ListView Scrolling with MVVM

krishnan.s2-Sep-10 19:09

krishnan.s

2-Sep-10 19:09

Hi ,

I need to acheive List View Scrolling with MVVM. As iam new to MVVM Can u please let me know how it can be acheived . Can anyone please provide a sample for the same if possible.

Thanks
Krish

Abhinav S2-Sep-10 23:50

2-Sep-10 23:50

Listview scrolling in general has nothing to do with MVVM and is an inherent property of the control.
Could you please give more details so we can understand your question better?

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krishnan.s3-Sep-10 2:24

krishnan.s

3-Sep-10 2:24

I need to scroll the listview on a button click. Iam following MVVM pattern. I tried the following but it is not working.

<local:SortableListView  x:Name="headLinesGridView" IsSynchronizedWithCurrentItem="True"  Style="{DynamicResource ListViewStyle}" ScrollViewer.VerticalScrollBarVisibility="Hidden"<br />
                           ItemsSource="{Binding Source={StaticResource TestDataSource}}" ItemContainerStyle="{StaticResource headLinesGridViewStyle}"<br />
                           ColumnHeaderSortedAscendingTemplate="HeaderTemplateArrowUp" ColumnHeaderSortedDescendingTemplate="HeaderTemplateArrowDown" ColumnHeaderNotSortedTemplate="HeaderTemplateTransparent"><br />
            <ListView.View>                   <br />
                <GridView ColumnHeaderContainerStyle="{StaticResource gridViewHeaderStyle}" ColumnHeaderTemplate="{StaticResource HeaderTemplateTransparent}"><br />
                    <local:SortableGridViewColumn Header="ID" DisplayMemberBinding="{Binding ID}" SortPropertyName="ID" Width="50" /><br />
                    <local:SortableGridViewColumn Header="First Name" DisplayMemberBinding="{Binding FirstName}" SortPropertyName="FirstName"  IsDefaultSortColumn="True"/><br />
                    <local:SortableGridViewColumn Header="Last Name" DisplayMemberBinding="{Binding LastName}" SortPropertyName="LastName" /><br />
                    <local:SortableGridViewColumn Header="Date of Birth" DisplayMemberBinding="{Binding DateOfBirth}" SortPropertyName="DateOfBirth" /><br />
                    <local:SortableGridViewColumn Header="QueueStatus" SortPropertyName="QueueStatus" IsDefaultSortColumn="True" CellTemplate="{StaticResource IconCellTemplate}"/><br />
                </GridView>              <br />
            </ListView.View><br />
            <ListView.ItemsPanel><br />
                <ItemsPanelTemplate><br />
                  <WrapPanel Orientation="Vertical"></WrapPanel><br />
                </ItemsPanelTemplate><br />
            </ListView.ItemsPanel><br />
        </local:SortableListView>            <br />
        <Button Grid.Row="1" Command="ScrollBar.LineDownCommand" CommandTarget="{Binding ElementName = Test}">Scroll Down</Button>

Pete O'Hanlon3-Sep-10 3:12

3-Sep-10 3:12

This is a common mistake in MVVM, trying to do too much in the VM. As this line down operation has absolutely no bearing on the model, it's perfectly fine to do this in code behind the view; after all, you just want to move the scrollbar on a visual. Go for it.

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Abhinav S3-Sep-10 4:39

3-Sep-10 4:39

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PhysicalMedia-Class

holzmcgyver2-Sep-10 14:38

holzmcgyver

2-Sep-10 14:38

Hey,

is there anyone how get experiences with this class. I try to use it, in a normal way like this:
ManagementObjectSearcher mang = new ManagementObjectSearcher("SELECT * FROM Win32_DiskDrive");
foreach (ManagementObject obj in mang.Get())
{
MessageBox.Show(Convert.ToString(obj["Description"]));
}
Here, i used the DiskDrive-Class, and all work fine, but if i try to use the PhysicalMediaClass in the equal way, the output just gives me a zero-string.
what´s my mistake?? can anyone help me???
holzmcgyver

Re: PhysicalMedia-Class

Pete O'Hanlon2-Sep-10 22:48

2-Sep-10 22:48

holzmcgyver wrote:
what´s my mistake??

Well, for a start, this is the Silverlight/WPF forum.

holzmcgyver wrote:
MessageBox.Show(Convert.ToString(obj["Description"]));

Does Description exist in the collection? Try Tag instead.

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Re: How to control the text and other properties in ResourceDictionary object that i wrote ?

WPF Listbox

Drathmar2-Sep-10 10:57

Drathmar

2-Sep-10 10:57

I recently started the WPF and I came across a weird behavior in listboxes.

I have it binding to a viewmodel object and displaying the view properly, even have it selecting the item properly.

Sometimes those listbox have text boxes for my user to type in, and when they hit the F key, it moves to the next listbox item.

After alot of digging I found out that it has to do with the name space of the item bound to the listbox. If I change the viewmodels class to "zsomename.folder.viewmodel" then when I type z in the text box it moves it to the next listbox item.

Its like there's a built in behavior to select a matching listbox item base off the starting letter... but how do I remove this, or what is calling this.

Anyone have any ideas?

Re: WPF Listbox

AspDotNetDev3-Sep-10 12:02

AspDotNetDev

3-Sep-10 12:02

That sounds weird. Can you paste a small code example here so we can reproduce this?

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Re: WPF Listbox

Dave Kerr3-Sep-10 23:18

Dave Kerr

3-Sep-10 23:18

There is indeed built in behaviour to do this - however, your textbox shouldn't invoke this, are you using a datatemplate?

Can you please post the XAML that creates the listbox and its items? I'm sure we can help out Smile | :)

By the way the zsomename.folder.viewmodel is indeed why Z is selecting an item, however, if the keydown event in the textbox is bubbling then this needs to be address (bubbling events are those that at a point in the logical tree and move up).

Re: WPF Listbox

Drathmar23-Sep-10 11:01

Drathmar

23-Sep-10 11:01

Well it came up because we have a list box inside a listbox.

I was trying to make it so that when the user presses a letter "a,b,c,d,e,f... etc" it would select that given listbox subitem. Instead it move to the next question.

So this is happening in the key down event and I need to handle it there? Or is there a better way of doing it?

Abhinav S2-Sep-10 4:04

Generate decimal point automatically while entering in textbox in wpf

2-Sep-10 4:04

I think what you are looking for is TemplateBinding. See here[^].

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sumit70341-Sep-10 19:43

sumit7034

1-Sep-10 19:43

Hi I want to generate decimal point automatically while entering in textbox of wpf. Like the decimal point automatically generated while entering amount in ATM machine.

Please help thanks in advance.

Re: Generate decimal point automatically while entering in textbox in wpf

Christian Graus1-Sep-10 20:06

Christian Graus

1-Sep-10 20:06

Handle the focus lost event, then take the text of the textbox, and make sure it's a number, then use the Substring function to split it and insert your decimal.

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

Re: Generate decimal point automatically while entering in textbox in wpf

Abhinav S1-Sep-10 20:47

Re: Generate decimal point automatically while entering in textbox in wpf

1-Sep-10 20:47

You could use a masked edit box.

See here[^].

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sumit70341-Sep-10 21:39

sumit7034

1-Sep-10 21:39

But these are paid ones how can I implement these in my wpf window application

Re: Generate decimal point automatically while entering in textbox in wpf

Pete O'Hanlon1-Sep-10 23:07

1-Sep-10 23:07

You can use a MaskedTextBox[^] or FilteredTextBox[^].

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Re: Generate decimal point automatically while entering in textbox in wpf

V.2-Sep-10 20:16

2-Sep-10 20:16

You can add normal winforms controls (like maskedtextbox) to WPF.

From: Wrox, WPF Programmer’s Reference.

Before you can use a WindowsFormsHost, you must perform three steps:
1. Add a reference to the WindowsFormsIntegration library. In Visual Studio, you can open the
Project menu, select “Add Reference,” and select the library from the .NET tab on the Add
Reference dialog. In Expression Blend, you can open the Project menu, select Add Reference,
and then browse to the library file. On my system, it’s installed at C:\Program Files\
Reference Assemblies\Microsoft\Framework\v3.0\WindowsFormsIntegration.dll.
2. Add a reference to the System.Windows.Forms.dll library. Again, in Visual Studio, you can
use the Project menu’s Add Reference command and select the library from the resulting dialog.
In Expression Blend, you can again use the Project menu’s Add Reference command and
then browse to the library file. On my system, it’s installed at C:\Windows\Microsoft.NET\
Framework\v2.0.50727\System.Windows.Forms.dll.
3. Add a namespace declaration for the Windows Forms namespace to the top of the XAML
file. The declaration should look something like this:
xmlns:wf=”clr-namespace:System.Windows.Forms;assembly=System.Windows.Forms”

Hope this helps.

Re: Generate decimal point automatically while entering in textbox in wpf

Pete O'Hanlon2-Sep-10 22:38

2-Sep-10 22:38

Be aware, though, that any theming you apply to your textboxes will not apply. Also, focus management in WPF is problematic enough without adding Winforms into the mix. I'd avoid this option altogether and use a native WPF version instead as there are plenty of freely available solutions and this is an unnecessary step.

I have CDO, it's OCD with the letters in the right order; just as they ruddy well should be

Forgive your enemies - it messes with their heads