WPF Discussion Boards

The question I would have is, does the other machine have video CODECs suitable for playing back your MP4? You could use Microsoft Media Encoder or a tool like a free video converter to convert the file format.

This space for rent

Hello, Pete O'Hanlon.
Yes, it's the same video codec.
Anyway, when I make a copy of the executable and I put it on the desktop, I have the same problem.
For this to work perfectly, I have to leave the executable in its original place. Eratos.

I want to create a combobox with checkboxes. In the popup but below the list of checkboxes I want Apply and Clear buttons.

This is what I'm looking for.

So far I have

<pre><ComboBox.ItemTemplate>
    <DataTemplate>
        <StackPanel Orientation="Vertical">

<pre>
        <StackPanel Orientation="Horizontal">
            <CheckBox IsChecked="{Binding IsSelected}"
                    Margin="5" />
            <TextBlock Text="{Binding Caption}"
                    Margin="5" />
        </StackPanel>

    </StackPanel>
</DataTemplate>

Not sure how to get the two buttons below the list. Can someone show me how to do this?

Thanks

If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.

Nobody get points for doing weird things with "standard controls".

Pretty sure a GridView or DataGrid with checkboxes would accomplish the same thing without wasting time on "decorating".

Maybe with an "Expander" thrown in.

"(I) am amazed to see myself here rather than there ... now rather than then".
― Blaise Pascal

Wow.. Why did you even bother posting?

If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.

It's a parent-child / master-detail relationship.

Sync a "plain, standard" combobox with any "detail": listview, data grid, grid view for your "check boxes". Buttons operate on what's "current".

Read "Common User Access Guidelines".

Keep the weird stuff in custom / user controls.

"(I) am amazed to see myself here rather than there ... now rather than then".
― Blaise Pascal

I have a canvas which I hook to the ViewModel:

XML

<Border Grid.Row="0" Margin="5" BorderThickness="1" BorderBrush="Black" x:Name="container">
    <Canvas x:Name="cnvMainView" Background="White" Height="{Binding Path=ActualHeight,
                                   ElementName=container}" Width="{Binding Path=ActualWidth, ElementName=container}">
        <i:Interaction.Triggers>
            <i:EventTrigger EventName="MouseDown" >
                <i:InvokeCommandAction Command="{Binding MouseDown}" />
            </i:EventTrigger>
        </i:Interaction.Triggers>
    </Canvas>
</Border>

With the ViewModel:

C#

class MainViewModel
    {
        public MainViewModel()
        {
            this.MouseDown = new DelegateCommand<object>(
                                             this.OnMouseDown, this.CanMouseDown);
        }

        public ICommand MouseDown { get; private set; }

        private void OnMouseDown(object arg)
        {
        //Do Something
        }
        private bool CanMouseDown(object arg) { return true; }
    }

But I really don't need all these details, I just need the positions received:

C#

var MouseDownPosition = from evt in Observable.FromEventPattern<MouseEventHandler,MouseEventArgs>(
                             h => cnvMainView.MouseDown += h,
                             h => cnvMainView.MouseDown -= h)
                             select evt.EventArgs.GetPosition(cnvMainView);

So how do people hook the Rx observables to the ViewModel?

I gave up on the Rx part and did my own EventCommand:

using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Interactivity;

namespace WpfSimpleReflectionAssistant
{
    //Code from:
    //https://social.msdn.microsoft.com/Forums/silverlight/en-US/5cd586e7-640f-447b-9040-e9270173abf7/passing-drop-event-data-in-a-command-parameter-using-mvvm-and-the-interactivity-framework?forum=silverlightmvvm
    public sealed class EventCommand : TriggerAction<DependencyObject>
    {

        public static readonly DependencyProperty CommandParameterProperty =
            DependencyProperty.Register("CommandParameter", typeof(object), typeof(EventCommand), null);


        public static readonly DependencyProperty CommandProperty = DependencyProperty.Register(
            "Command", typeof(ICommand), typeof(EventCommand), null);


        public static readonly DependencyProperty InvokeParameterProperty = DependencyProperty.Register(
            "InvokeParameter", typeof(object), typeof(EventCommand), null);

        private string commandName;

        public object InvokeParameter
        {
            get
            {
                return this.GetValue(InvokeParameterProperty);
            }
            set
            {
                this.SetValue(InvokeParameterProperty, value);
            }
        }


        public ICommand Command
        {
            get
            {
                return (ICommand)this.GetValue(CommandProperty);
            }
            set
            {
                this.SetValue(CommandProperty, value);
            }
        }

        public string CommandName
        {
            get
            {
                return this.commandName;
            }
            set
            {
                if (this.CommandName != value)
                {
                    this.commandName = value;
                }
            }
        }

        public object CommandParameter
        {
            get
            {
                return this.GetValue(CommandParameterProperty);
            }

            set
            {
                this.SetValue(CommandParameterProperty, value);
            }
        }

        public object Sender { get; set; }

        protected override void Invoke(object parameter)
        {
            this.InvokeParameter = parameter;
            if (this.AssociatedObject != null)
            {
                ICommand command = this.Command;
                if ((command != null) && command.CanExecute(this.CommandParameter))
                {
                    if (this.CommandParameter.GetType() == typeof(Canvas))
                    {
                        Canvas myCanvas = (Canvas)this.CommandParameter;
                        Point pass = Mouse.GetPosition(myCanvas);
                        command.Execute(pass);
                    }
                    else
                        command.Execute(this.CommandParameter);
                }
            }
        }
    }
}

This would probably be better as an Attached property instead, but I didn't bother just now. But surely there has to be a better way or?

I am working on a wpf to developer an scrollbar exactly as same as a client send me the screen, so is their any one who can help me?
[^]

Help you with what?

this is the link i uploaded am image and i need to develop this kind of scrollviewer.

Please read How to get an answer to your question - Silverlight / WPF Discussion Boards[^]

Google has plenty of suggestions for you. For example:
Styling a ScrollViewer/Scrollbar In WPF[^]
Custom ScrollBars in WPF[^]
ScrollBar Styles and Templates[^]

You need to go through some of those results and try to match the design.

NB: Your question reads as if you're expecting someone here to do the work and give you the code. That's not how this site works.

(And even if we were that kind of site, your link is broken. It only works for people who are logged in to your DropBox account. You would need to click the "Share" button next to the file, and generate a shared link.)

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

How can I iterate through the GridView Rows?

I want to export the gridview to excel irrespective of the databinding. The Gridview doesnot have a property for Rows.

I would like to iterate through each row and column to a Datatable to export to excel.

Dim gridView As GridView = listView.View

I can get the columns from gridView, but how to get the rows?

Thanks in advance.

You don't get "rows from a GridView".

You also don't get them from the ListView.

You get them via the ListView.ItemsSource as a collection of source objects.

"(I) am amazed to see myself here rather than there ... now rather than then".
― Blaise Pascal

Thanks for the reply

I am planning to have a generic function to export the Listview to Excel.

But different listboxes have different datasources (observable collection).

So I would like to find a way to iterate throgh GridView/ListView as in dataGrid and read cells.

Ok, then..

Iterate the columns.
Extract the path names for each binding source bound to each column.
Use the extracted name to reflect on the rows in the itemsource and "getvalue" the property values.
Export the values.

Easy.

"(I) am amazed to see myself here rather than there ... now rather than then".
― Blaise Pascal

Thanks for the fast reply.

Can you give me a sample code for that please.

At least a link with similar example would be helpful

Thanks in advance

Search on "sorting gridview" columns.

It will give you a start on "reflecting" lists and grids.

I don't write code for free.

"(I) am amazed to see myself here rather than there ... now rather than then".
― Blaise Pascal

I'm trying to create a navigation bar like this.

Yesterday I posted on this, and I was unable to get it to work right.

So, what I'm thinking is that each blue bar would be an Expander. Each Expander could then have either another Expander, or a list of hyperlinks.

I want to make it flexible enough so that by simply adding data to a group in the model, they appear as a group in the nav bar.

Here's what I got so far:
Model

public class NavigationItem : BindableBase // Implements INPC
{
    public int ItemId { get; set; }
    public string Caption { get; set; }
    public NavigationItemType ItemType { get; set; }
    public ObservableCollection<NavigationItem> NavigationItems { get; set; }
}

XAML

<pre><ListBox Grid.Row="1" 
            Grid.Column="0"
            ItemsSource="{Binding NavigationBarItems}">

<pre>
<ListBox.ItemTemplate>
    <DataTemplate>
        <Expander Header="{Binding Caption}">
            <ListBox ItemsSource="{Binding NavigationItems}">
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <TextBlock Text="{Binding Caption}"/>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>
        </Expander>
    </DataTemplate>
</ListBox.ItemTemplate>

This it what I have now.
https://1drv.ms/i/s!AjBmoYAYz_v2ggqcuk5OS5YW1KDO

You can see that the first group doesn't have the subgroups.

How do I make these subgroups in the XAML?

Thanks

If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.

modified 1-Dec-17 12:46pm.

What is wrong with a treeview, Telerik (and many others) have an outlook bar type tool that may be what you are looking for.

Personally I would use a treeview and use the click event to toggle the expansion. This assumes you don't need a visual cue to tell if there are children under a node.

Never underestimate the power of human stupidity
RAH

I have a WPF TreeView that I'm trying to load with the following items:

Projects
  - Builder 1
    - Project 1a
    - Project 1b
  - Builder 2
    - Project 2a
    - Project 2b

Companies
  - Company 1
  - Company 2

Employees
  - Employee 1
  - Employee 2

Problem
The Companies and Employees nodes both load fine. For the first level all I see is "Projects". The Builders and Projects under them don't appear. I'm guessing my HierarchicalDataTemplate is wrong but I can't see it. Anyone see what's wrong?

Thanks

Models

public class NavigationCategory : BindableBase // (Implements INPC - Abbreviated here)
{
    public string Caption { get; set; }
    public NavigationGroup Group { get; set; }
    public ObservableCollection<NavigationCategory> Categories { get; set; }
    public ObservableCollection<NavigationItem> NavigationItems { get; set; }
}

public class NavigationItem : BindableBase
{
    public int ItemId { get; set; }
    public string Caption { get; set; }
    public ViewType ViewType { get; set; }
}

The XAML

<TreeView Name="Navigation" 
            Grid.Row="1" 
            Grid.Column="0" 
            ItemsSource="{Binding NavigationBarItems}">

    <TreeView.Resources>

        <HierarchicalDataTemplate DataType="{x:Type models:NavigationCategory}" 
                                    ItemsSource="{Binding NavigationItems}">
            <TextBlock Text="{Binding Path=Caption}" />
        </HierarchicalDataTemplate>

        <DataTemplate DataType="{x:Type models:NavigationItem}">
            <TextBlock Text="{Binding Path=Caption}" />
        </DataTemplate>

    </TreeView.Resources>

</TreeView>

View Model

private ObservableCollection<NavigationCategory> _NavigationBarItems;
public ObservableCollection<NavigationCategory> NavigationBarItems
{
    get { return _NavigationBarItems; }
    set
    {
        if (_NavigationBarItems != value)
        {
            _NavigationBarItems = value;
            RaisePropertyChanged("NavigationBarItems");
        }
    }
}

private void LoadNavBar()
{
    NavigationBarItems = new ObservableCollection<NavigationCategory>
    {
        new NavigationCategory
        {
            Group = NavigationGroup.Projects,
            Caption = "Projects",

            Categories = new ObservableCollection<NavigationCategory>
            {
                new NavigationCategory
                {
                    Group = NavigationGroup.Builders,
                    Caption = "Builder 1",
                    NavigationItems = new ObservableCollection<NavigationItem>
                    {
                        new NavigationItem
                        {
                            ItemId = 101,
                            Caption = "Project 1a",
                            ViewType = ViewType.Project
                        },
                        new NavigationItem
                        {
                            ItemId = 102,
                            Caption = "Project 1b",
                            ViewType = ViewType.Project
                        }
                    }

                },
                new NavigationCategory
                {
                    Group = NavigationGroup.Builders,
                    Caption = "Builder 2",
                    NavigationItems = new ObservableCollection<NavigationItem>
                    {
                        new NavigationItem
                        {
                            ItemId = 201,
                            Caption = "Project 2a",
                            ViewType = ViewType.Project
                        },
                        new NavigationItem
                        {
                            ItemId = 202,
                            Caption = "Project 2b",
                            ViewType = ViewType.Project
                        }
                    }

                }
            }
        },

        new NavigationCategory
        {
            Group = NavigationGroup.Companies,
            Caption = "Companies",

            NavigationItems = new ObservableCollection<NavigationItem>
            {
                new NavigationItem
                {
                    ItemId = 301,
                    Caption = "Company 1a",
                    ViewType = ViewType.Company
                },
                new NavigationItem
                {
                    ItemId = 302,
                    Caption = "Company 1b",
                    ViewType = ViewType.Company
                }
            }
        },

        new NavigationCategory
        {
            Group = NavigationGroup.Employees,
            Caption = "Employees",

            NavigationItems = new ObservableCollection<NavigationItem>
            {
                new NavigationItem
                {
                    ItemId = 401,
                    Caption = "Employee 1a",
                    ViewType = ViewType.Employee
                }
            }
        }
    };
}

If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.

Have you looked at Josh Smiths articles on the wpf treeview Simplifying the WPF TreeView by Using the ViewModel Pattern. I base all my extensive use of the treeview and treelistview on his design and it works well.

Never underestimate the power of human stupidity
RAH

Yes I have, and I followed that design - at least I think I did.

If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.

You category and item are different structure.

I create one list of TreeNode with a collection of TreeNodes as the child items. NodeLabel is the display field and a tag (object) property holds the populating record (project or builder or item)

I have a recursive loading method that load the appropriate source into the TreeNode/ChildItems based on relationship keys.

Never underestimate the power of human stupidity
RAH