Dynamically set properties - WPF Discussion Boards

dlarkin7716-Jun-08 1:35

16-Jun-08 1:35

Hi,

I'm relatively new to WPF and am still trying to get my head around certain aspects so if this is a stupid question please accept my apologies in advance.

I have a listbox that is bound to a list of custom objects.
Based on the value of a property in each object I want the listbox item to be displayed differently

The data binding is working fine and the item template that I am using works fine, my problem is in changing the item template based on a property value.

Trivial example:

Assume I have a class Person with two properties : Male and Female

If Male == true I want the listbox item to be rendered as a grid with three rows and 2 columns
If Female == true I want the listbox to be rendered as a grid with a single row

Is this possible?

Thanks very much,

dlarkin77

Re: Multiple ItemTemplates in a ListBox

Christian Graus16-Jun-08 2:18

Christian Graus

16-Jun-08 2:18

We do something like this by having a base listboxitem class, then having derived classes which have styles, and which we use to add items. We mix styles within the listbox tho, sounds like you want to have one or the other. I am asking something similar below, and a Property Trigger is what was suggested for me.

Christian Graus

Please read this if you don't understand the answer I've given you

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

Re: Multiple ItemTemplates in a ListBox

Gideon Engelberth16-Jun-08 7:37

Gideon Engelberth

16-Jun-08 7:37

I would start by looking at using triggers in the style of the data template given to the ItemTemplate property. On a hunch, the style will probably not do quite what you need since it sounds more like you are using two different data templates. In that case, I would look at the ItemTemplateSelector property, which takes a DataTemplateSelector (documentation on MSDN).

Re: Multiple ItemTemplates in a ListBox

dlarkin7717-Jun-08 0:25

dlarkin77

17-Jun-08 0:25

Thanks for the advice. I'll look into both of those.

Re: Multiple ItemTemplates in a ListBox

dlarkin7717-Jun-08 2:46

dlarkin77

17-Jun-08 2:46

Hi,

Using a DataTemplateSelector solved my problem.

Thanks very much,

dlarkin77

[WPF]why Image not support Animation ?

KornZhang15-Jun-08 23:23

KornZhang

15-Jun-08 23:23

[WPF]why Image not support Animation ?

MessageBox.Show(item.HasAnimatedProperties.ToString());//false
it return false , How to move it from a Point to another Point ?

thanks !

Re: [WPF]why Image not support Animation ?

Christian Graus16-Jun-08 2:18

Christian Graus

16-Jun-08 2:18

Put it in a stackview or grid.

Dynamically set properties

Christian Graus15-Jun-08 9:57

Christian Graus

15-Jun-08 9:57

I have a slider and I want to change the bitmap used for the slider control, and the size of the slider, based on a boolean property.

So within a style for the slider, I want to change ' Slider_Thumb' in the following:

<Track Name="PART_Track">

<Track.Thumb>

<Thumb x:Name="Thumb" Style="{StaticResource Slider_Thumb}"/>

</Track.Thumb>

</Track>

and the height in this line:

<Setter Property="Height" Value="16" />

How do I go about doing that ?

Re: Dynamically set properties

Pete O'Hanlon15-Jun-08 10:50

Pete O'Hanlon

15-Jun-08 10:50

Christian - take a look at this[^] article from Sacha and Marlon. They have restyled the slider control (about 3 quarters of the way down).

Deja View - the feeling that you've seen this post before.

My blog | My articles

Re: Dynamically set properties

Christian Graus15-Jun-08 11:16

Christian Graus

15-Jun-08 11:16

thanks - but i think they are just styling it. I've done that. I want to change the style I use, in code, based on a property

Re: Dynamically set properties

Insincere Dave15-Jun-08 12:20

Insincere Dave

15-Jun-08 12:20

Where does the boolean property come from?
If it is one of the Sliders or Thumbs properties a Trigger will work. See the ControlTemplate example for slider, it uses a Trigger to change the color of the thumb on mouse over and change the size of the slider based on its orientation.
If the property is from elsewhere a DataTrigger might work but you would probably have to alter your resources a bit.

Re: Dynamically set properties

Christian Graus15-Jun-08 12:58

Christian Graus

15-Jun-08 12:58

Looks promising - thanks.

Horizontal TreeListView [modified]

Olivier Baillard13-Jun-08 4:43

Olivier Baillard

13-Jun-08 4:43

Hi,

I am new in WPF and would like some advices of you guys if something is possible to do in WPF.

For our application, we want to show a list of objects - List - in a ListView. Until now nothing difficult. But each object A contains several properties which are in turns others objects (object B, object C, ...).

So we think it could be good idea to combine a Treeview with a ListView. Because we need a "classification tree" look, the TreeViewItem need to be showned horizontally - not vertically like in a normal tree. This too is not difficult to do with WPF. The difficulty is to know which columns is to be showned in the ListView when a node of the tree is opened or collapsed.

So our idea here would be to adapt the templace of the ListView header so that each nodes/leafs of the tree correspond to one column header of the ListView. Do you means this would be possible to do in WPF.

The alternativ would be to use a horizontal TreeView and a seperate ListView and to adapt the column of the Listview when the user open/close a tree node. Which I don't know how to do actually in WPF.

May be somebody can give me some advices?

Thanks,
Olivier

modified on Friday, June 13, 2008 11:13 AM

Binding a panel to the selected item type

Gian13-Jun-08 1:16

Gian

13-Jun-08 1:16

Hello,
i'm studying WPF for quite a while and i've some problems understanding how to perform a simple implementation i usually use in my programs. I've a treeview representing at the various levels different types of items. When i click on an item i can see a form/property grid/etc showing the attributes of that element so i can modify/see them. Of coruse each type of element has different attributes.
There's also another situation when you have a list of items and not a treeview, but each item is logically attached to a serie of data (see for example an options dialog when you have the list of categories on the left and on the right the options of the selected category)

I'm thinking about two ways to do that and i'd like your opinions:

1) Assign a window (or i presume, an user control) to a panel on the fly when the selected item is change. Is it possible? There's a way to do that only via xaml?

2) Load each type of details control via xaml and somehow bind the visibily property of each control to the type of the selected item

3) As you can do a datatemplate to represent each item in the treeview, apply different templates to the panel binded to the selected item of the treeview, using the DataType property of the template to bind the correct panel to the current item type. Is it possible? Is there any example of that?

Thanks Smile | :)

Re: Binding a panel to the selected item type

Gideon Engelberth13-Jun-08 8:45

Gideon Engelberth

13-Jun-08 8:45

It sounds to me like you are describing what would normally be done with a tab control. I would start there and style the tab control to get the "tabs" to look how you want. Since TabControl inherits from ItemsControl, any trick you used for other list/tree controls should work there as well. Hopefully some sort of style would work, but if not, you could always write a new control template.

If that does not work, I would recommend your option 2. I would use radio buttons (with the template modified to not show the circles) in a stack panel and bind the Visibility of the options "pages" to the IsChecked of the radio button. Since Visibility is not a boolean, this will of course require either a converter or some clever triggers.

A little poking around and I got this as something you may be able to start from:

<TabControl TabStripPlacement="Left">
<TabControl.Resources>
<DataTemplate x:Key="TabHeaderTemplate">
<StackPanel Margin="3">
<TextBlock>Option Group</TextBlock>
<TextBlock Text="{Binding}" />
</StackPanel>
</DataTemplate>
</TabControl.Resources>

<TabItem Header="Tab Number 1"
HeaderTemplate="{StaticResource TabHeaderTemplate}">
<Button>BTN 1</Button>
</TabItem>
<TabItem Header="Tab Number 2"
HeaderTemplate="{StaticResource TabHeaderTemplate}">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>

<TextBlock Grid.Row="0" Grid.Column="0">Property 1</TextBlock>
<TextBox Grid.Row="0" Grid.Column="1">ddd</TextBox>
<TextBlock Grid.Row="1" Grid.Column="0">Property 2</TextBlock>
<TextBox Grid.Row="1" Grid.Column="1">fff</TextBox>
</Grid>
</TabItem>
</TabControl>

WPF ComboBox problems

coolestnerd12-Jun-08 5:38

coolestnerd

12-Jun-08 5:38

I am setting a combobox with 3 choices that the user will select one. When the choice is made, I want to put the choice in the Properties.Settings.Default.ApplicationSelected which I have defined as an int. So far, so good.

But when the user restarts the application, I would like to cause the combobox to be set to the saved choice. I haven't found any way to do this, and I get an error when I do this:

comboBox1.SelectedIndex = Properties.Settings.Default.ApplicationSelected;

How do I do this?

Chuck Summers
summers.chuck@gmail.com

Re: WPF ComboBox problems

Jammer12-Jun-08 6:13

Jammer

12-Jun-08 6:13

Are you sure that the setting is being saved???

I do all my users settings binding in XAML:

Create a ResourceSettings.xaml file like:

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:settings="clr-namespace:YourNameSpace.Properties">
    <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary>
            <settings:Settings x:Key="settings" />
        </ResourceDictionary>
    </ResourceDictionary.MergedDictionaries>
</ResourceDictionary>

Then in app.xaml as a dictionary pointing to this in your merged dictionaries:

<ResourceDictionary.MergedDictionaries>
    <ResourceDictionary Source="SettingsResources.xaml"/>
</ResourceDictionary.MergedDictionaries>

then for each setting you wish to bind do:

PropertyToBind="{Binding Source={StaticResource settings}, Path=Default.MainTop, Mode=TwoWay}"

Don't forget to add a window_closed to your main window with:

private void Window_Closed(object sender, EventArgs e)
{
    //Stores all user settings (see XAML for bindings)
    Settings.Default.Save();
}

Cheers,

Jammer

Going where everyone here has gone before! Smile | :)

My Blog

Re: WPF ComboBox problems

coolestnerd12-Jun-08 7:21

coolestnerd

12-Jun-08 7:21

I know it is being saved, and I would like to do it in C#, but I'll look at your solution to see if I can use that.

Thanks for your time,

Chuck

Class for Updating version of Silverlight Application

am 200912-Jun-08 0:40

am 2009

12-Jun-08 0:40

Hi Is there any class in .Net Silverlight which is used for updating version of application.

Regards
ABM

Re: Class for Updating version of Silverlight Application

Michael Sync15-Jun-08 16:15

Michael Sync

15-Jun-08 16:15

Normally, we used to update the version of application manually. Why do you want to update the version of Silverlight from code?

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

WPF ContextMenu -> open with left mouse-click???

AndyGrothe11-Jun-08 20:55

AndyGrothe

11-Jun-08 20:55

hello ng,

how can i open/show a wpf-contextmenu with the left mouseclick???

byby andy

Re: WPF ContextMenu -> open with left mouse-click???

AndyGrothe16-Jun-08 21:57

AndyGrothe

16-Jun-08 21:57

hello,

it is so simple:

ContextMenu.isOpend = True

is the solution

byby andy

Unexpected WPF Behaviour with Microsoft.Win32.OpenFileDialog [modified]

Mitch F.11-Jun-08 18:57

Mitch F.

11-Jun-08 18:57

I've come across some really unexpected behavior using the OpenFileDialog, WPF, and a PocketPC (physical) device.

I'm trying to let users select a file on their PocketPC using an OpenFileDialog, and when the user selects Open, WPF copies the file into the Temporary Internet Files directory, and then returns that as the path. I'm really confused as to why this happens, but here's the code to reproduce it.

Dim ofd As New Microsoft.Win32.OpenFileDialog
ofd.CheckFileExists = False
ofd.CheckPathExists = True
ofd.AddExtension = False
ofd.Filter = "Folders|*.*"
ofd.Multiselect = False
ofd.InitialDirectory = "C:\"

ofd.ShowDialog()

Console.WriteLine(ofd.FileName)

When I select a file from the My Documents (eg, "\My Documents\Meeting Notes.psw") directory on my PocketPC, this is the output that is written in the console "C:\Users\*****\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\82P6MGLK\Meeting_Notes[1].psw" (Note, the astericks are used to hide my user-name). In addition to this, if you try it with a large file, the UI just freezes until the file finishes copying. Windows does not say that the program is "Not Responding", just you can't interact with the UI at all.

Does anyone know why this happens? It certainly is interesting behaviour.

Thanks,
Mitch

modified on Thursday, June 12, 2008 1:11 AM

Re: Unexpected WPF Behaviour with Microsoft.Win32.OpenFileDialog

Pete O'Hanlon18-Jun-08 8:56

Pete O'Hanlon

18-Jun-08 8:56

It'll be the same behaviour as with a Windows Forms app. It sounds like you are performing the copy on the primary thread, which blocks the UI until it completes the operation. Try moving the copy onto a background thread instead - this should help.

Deja View - the feeling that you've seen this post before.

My blog | My articles

Re: Unexpected WPF Behaviour with Microsoft.Win32.OpenFileDialog

Mitch F.18-Jun-08 10:15

Mitch F.

18-Jun-08 10:15

Pete O'Hanlon wrote:
It'll be the same behaviour as with a Windows Forms app.

I just tried the same block of code in .Net 2.0, and that's correct; it copied the file to my hard drive as well.

Pete O'Hanlon wrote:
It sounds like you are performing the copy on the primary thread, which blocks the UI until it completes the operation.

The only thing that confuses me is that I don't have any code to perform the copy in my project; when the user presses the Open button on the OpenFileDialog, it is copied over automatically without any extra code.

Thanks,
Mitch

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