WPF Discussion Boards

Re: WPF/MVVM App On WIndows 8 Tablet - Touch Doesn't Work

11-Sep-13 6:02

I'm working on a WFP/MVVM app that hast portions that need to run on a Windows 8 tablet.

Some parts of the app are not responding to touch. Buttons do, but grid row selection and other controls do not.

I'm brand new to working with touch. My understanding is that if you don't handle the touch event, it's promoted to a click.

I can trap Touch Down/Up in the code behind. But that doesn't help with my Grid.SelectedItem in an MVVM environment.

Anyone have any experience here that can point me in the right direction?

Thanks

If it's not broken, fix it until it is

Punamchand Dhuppad19-Sep-13 18:10

Punamchand Dhuppad

19-Sep-13 18:10

Did you use ManipulationStarted & ManipulationCompleted event?. Try this once.

WPF DataGrid with Bands

Kevin Marois10-Sep-13 11:50

Re: WPF DataGrid with Bands

10-Sep-13 11:50

How do you create a data grid in WPF with multiple bands? I can't find a single example

If it's not broken, fix it until it is

SledgeHammer0110-Sep-13 13:23

SledgeHammer01

10-Sep-13 13:23

You mean a treeview like hierarchy? Not natively supported, but its been hacked in:

http://blogs.msdn.com/b/mrochon/archive/2009/10/16/displaying-hierarchical-data-in-the-datagrid.aspx[^]

Re: WPF DataGrid with Bands

Kevin Marois10-Sep-13 13:24

Re: WPF DataGrid with Bands

10-Sep-13 13:24

Wonderful.

I'll use 2 grids.

If it's not broken, fix it until it is

Abhinav S10-Sep-13 16:57

Abhinav S

10-Sep-13 16:57

A number of third party tools like Telerik, Infragisitcs provide nested grid s that you could explore for your implementation.

Apps - Color Analyzer | Arctic | XKCD | Sound Meter | Speed Dial

Save/Load view configuration to/from xml file

columbos149278-Sep-13 2:23

columbos14927

8-Sep-13 2:23

Hello,
I have the next view XAML file:

<Grid>
            <ScrollViewer>
                <ItemsControl  ItemsSource="{Binding MemControls}"/>
            </ScrollViewer>
          
</Grid>

The ItemsControl binded to:

public ObservableCollection<UserControl> MemControls
        {
            get { return _memControls; }
            set { _memControls = value; }
        }

in the view Model.

I want to give the user an option to save GUI configuration. So when he press "Save" button i want to serialize the:

public ObservableCollection<UserControl> MemControls
<pre> 
to XML file and when he want to restore  GUI configuration i want to to desirialize from an XML file the list of controls and that way to restore GUI configuration.

How can i do it?
Maybe there is some other better way that dont involve XML files?

Thanks

Re: Save/Load view configuration to/from xml file

Mycroft Holmes10-Sep-13 15:06

Mycroft Holmes

10-Sep-13 15:06

Although this article [^]is for winforms it may give you some ideas.

I would also check out the comment from Tom Clement and see if he did an article on FormEx.

Never underestimate the power of human stupidity
RAH

Re: Save/Load view configuration to/from xml file

Abhinav S10-Sep-13 16:59

Abhinav S

10-Sep-13 16:59

You can always consider using the Infragistics persistance framework to save and retrieve control state - http://www.infragistics.com/products/silverlight/persistence-framework/[^].

Or its not too difficult building your own framework - just serialize and store control attributes directly in the database.

Apps - Color Analyzer | Arctic | XKCD | Sound Meter | Speed Dial

query using Lamda expression

picasso27-Sep-13 19:26

picasso2

7-Sep-13 19:26

Hello Listeners,
I created a SL application (using C#) that returns contents of a table in SQL database. Table has 5 columns (FirstName, LastName, Age..etc).
--A grid is populated with following:
EclipseMTXDomainContext context = new EclipseMTXDomainContext();
dataGrid1.ItemsSource = context.DBTables;
context.Load(context.GetDBTablesQuery());
--Mine domain service has an entry as follows:
public IQueryable<dbtable> GetDBTablesCompare() {
return this.ObjectContext.DBTables;
}

This works fine but
What I am trying to do now is load only two columns at a time so I added this in the domain services
public IQueryable<dbtable> GetTwoColms(string db1,string db2) {

return this.ObjectContext.DBTables.Where(P => P.col1Name == cl1 && P.col2Name == cl2);
}
--And the main program, added this to a button action
EclipseMTXDomainContext context = new EclipseMTXDomainContext();
dataGrid1.ItemsSource = context.DBTables;
context.Load(context. GetTwoColms Query("LastNames","FirstName"));

It does not fail but it does not return anything either.
Any help is greatly appreciated

Matt T Heffron9-Sep-13 7:01

Matt T Heffron

9-Sep-13 7:01

My first guess:
You have the column names as "LastNames" (plural) and "FirstName" (singular) which looks suspiciously like a typo.

picasso29-Sep-13 16:55

picasso2

9-Sep-13 16:55

ThanX Matt,
that is not the issue, it is just careless type when creating the post.

Richard MacCutchan9-Sep-13 21:08

Richard MacCutchan

9-Sep-13 21:08

picasso2 wrote:
it is just careless type when creating the post.

Then use Copy & Paste, so what we see here matches exactly with what you have in your program.

Veni, vidi, abiit domum

Open a window after progress bar load completes

koll Zhu22-Sep-13 23:43

koll Zhu

22-Sep-13 23:43

u can use lamda method select() return a implicit class consists of u wanted 2 columns

TheUltimateDebugger6-Sep-13 19:22

TheUltimateDebugger

6-Sep-13 19:22

Hi all

below is my wpf progress bar

Dim duration As New Duration(TimeSpan.FromSeconds(20))
        Dim doubleanimation As New DoubleAnimation(200.0, duration)
        PBar.BeginAnimation(ProgressBar.ValueProperty, doubleanimation)

Now please tell me how to open a window after the progress bar load complete.. Frown | :(

Re: Open a window after progress bar load completes

Richard Deeming9-Sep-13 1:39

Richard Deeming

9-Sep-13 1:39

Subscribe to the Completed event[^] on your DoubleAnimation[^] instance, and open the window when the event is raised.

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Re: Open a window after progress bar load completes

Joezer BH9-Sep-13 22:44

Joezer BH

9-Sep-13 22:44

5ed!

--
If money is your hope for independence, you cannot reach it.

Being loved gives you strength,
while loving gives you courage.

Another DependencyProperty Question

Kevin Marois5-Sep-13 16:11

5-Sep-13 16:11

I am still struggling to understand how to use DP's....

I am designing a Job Picker control[^]. The control is housed inside a Select Job window and also inside a wizard. When the user clicks a Job, I want that job exposed as a DP so the Window or Wizard know that a job was selected.

In the Window, when a Job is selected, the Select button will come on.

So in the control there is the tree:

<controls:TreeViewEx BorderThickness="0"
                        Margin="5"
                        ItemsSource="{Binding Jobs}"
                        SelectedItemEx="{Binding SelectedJob, Mode=TwoWay}"
                        IsManipulationEnabled ="True"/>

It's bound to Jobs and has it's SelectedItem bound to SelectedJob:

The JobListControl's VM is JobListViewModel:

#region Bound Properties
private ObservableCollection<JobSummaryModel> _Jobs;
public ObservableCollection<JobSummaryModel> Jobs
{
    get { return _Jobs; }
    set
    {
        if (_Jobs == value)
            return;

        _Jobs = value;
        RaisePropertyChanged("Jobs");
    }
}

private JobSummaryModel _SelectedJob;
public JobSummaryModel SelectedJob
{
    get { return _SelectedJob; }
    set
    {
        if (_SelectedJob == value)
            return;

        _SelectedJob = value;
        RaisePropertyChanged("SelectedJob");
    }
}
#endregion

This all works fine. When I click a Job in the tree, the SelectedJob property fires. So far so good.

Now, I need to expose the SelectedJob to the control's host (either the SelectJob window or the Wizard). So I went into the code behind and added a DP:

public partial class JobListView : UserControl
{
    public JobListView()
    {
        InitializeComponent();
    }

    #region SelectedJob DP
    public JobSummaryModel SelectedJob
    {
        get { return (JobSummaryModel)GetValue(SelectedJobProperty); }
        set { SetValue(SelectedJobProperty, value); }
    }

    public static readonly DependencyProperty SelectedJobProperty = DependencyProperty.Register("SelectedJob", typeof(JobSummaryModel),
          typeof(JobListView));
    #endregion
}

Next, in the Window's XAML I have:

<views:JobListView Grid.Row="0"
                   SelectedJob="{Binding Path=SelectedJob, Mode=TwoWay}"/>

The SelectJobWindowViewModel has a SelectedJob property of the same type as the JobListViewModel above;

The SelectJobWindowViewModel.SelectedJob property never fires.

I guess I was expecting the DP to pass the Selected Job from the control through to the Window.

Wat am I not seeing here?

Thanks

If it's not broken, fix it until it is

Pete O'Hanlon5-Sep-13 20:24

Pete O'Hanlon

5-Sep-13 20:24

First of all your property should be static, like this;

public static JobSummaryModel SelectedJob

Chill _Maxxx_

CodeStash - Online Snippet Management | My blog | MoXAML PowerToys | Mole 2010 - debugging made easier

Kevin Marois6-Sep-13 3:50

6-Sep-13 3:50

I tried it, but it won't compile. I get

An object reference is required for the non-static field, method, or property 'System.Windows.DependencyObject.SetValue(System.Windows.DependencyProperty, object)'

Same on the getter.

If it's not broken, fix it until it is

SledgeHammer016-Sep-13 5:07

SledgeHammer01

6-Sep-13 5:07

Pete must have been smoking some really good dope when he answered you Smile | :)

. Your code is correct how you have it. I'm assuming you got rid of the:

private JobSummaryModel _SelectedJob;
public JobSummaryModel SelectedJob
{
get { return _SelectedJob; }
set
{
if (_SelectedJob == value)
return;

_SelectedJob = value;
RaisePropertyChanged("SelectedJob");
}
}

stuff and REPLACED it with:

public JobSummaryModel SelectedJob
{
get { return (JobSummaryModel)GetValue(SelectedJobProperty); }
set { SetValue(SelectedJobProperty, value); }
}

public static readonly DependencyProperty SelectedJobProperty = DependencyProperty.Register("SelectedJob", typeof(JobSummaryModel),
typeof(JobListView));

??

The key point here that everybody seems to be forgetting is that DPs don't go through the C# getter / setter (when binding). That is only there to make it easier to get/set the DP from the code. Your SelectedJob method is *COMPLETELY* bypassed by the binding system.

Use one of the DependencyProperty.Register overloads that take a property changed callback. That is the ONLY way you can determine when a DP value changes.