Questions on UI for WPF Forum

1 answer

144 views

Hi,
I am using the GridView control, and have all my columns and rows generated on the fly, so nothing is known until runtime. By using Row and Column virtualization, I'm able to speed up the load time quite a bit. There's really only 1 problem left I'm seeing. With row virtualization, as you scroll down, it waits until you stop, then loads the appropriate rows. However with column virtualization, it scrolls over and loads the columns as you're scrolling, so you then end up having to let go of the scrollbar, and grab it again to continue scrolling, as more columns are loaded. Can we get the column loading to work similarly to the row loading, and not have them load one by one and causing the scrollbar to act jumpy?

Thanks,
Ryan

GridView

answered on 11 Apr 2013

2 answers

113 views

InvalidCastException when filtering

I am getting an InvalidCastException when there are 2 different classes at the same level of the tree hierarchy. For example, I have an MvDirectory class and an MvFile class. They both implement an int property called Size. They also share a common interface that implements Size. If I have a level of the hierarchy that consists of only MvDirectory instances, the filtering works fine. As soon as I add an instance of MvFile to the same level, I get an exception saying that MvFile cannot be cast to MvDirectory. I'm not sure why it is assuming all nodes at the same level are of the same type. Is there some way of getting it to use the shared interface or am I going to have to populate my tree with instances of the same class? Or am I just missing something?

Thanks,
Joe

TreeListView

answered on 11 Apr 2013

1 answer

117 views

Update GridView after adding an item

Hi there,

I have a connection to a MySQL-database and created my classes via EntityFrameWork.
I bound my GrdiView to one of the tables.

If I add a new object to the table, my GridView is not updated, until I reorder the items.
How can I update my GridView without using codebehind, because I am using MVVM for this project.

Best Regards
Manfred

GridView

answered on 11 Apr 2013

4 answers

434 views

UI automation

Hi, I'm coding UI tests and the most common task is to navigate to controls situated in different tabs using automation. The problem is I can't get the content of tabs except the tab selected by default. That is, I change between different tab pages and only the first one's automation tree is visible. The code is something like that below. The default WPF tab control works fine: I can get the content of currently selected tab. So how can this problem be solved? Thanks in advance.

[TestMethod]

public void TestMethod()

{

// find app window

var cond = new PropertyCondition(AutomationElement.NameProperty, "MainWindow");

AutomationElement foundWindow = AutomationElement.RootElement.FindFirst(TreeScope.Children, cond);

// find tab control

cond = new PropertyCondition(AutomationElement.ControlTypeProperty, System.Windows.Automation.ControlType.Tab);

AutomationElement foundTab = foundWindow.FindFirst(TreeScope.Subtree, cond);

var tabCtl = (WpfTabList)UITestControlFactory.FromNativeElement(foundTab, "UIA");

foreach (var tab in tabCtl.Tabs)

{

var elements = "";

Mouse.Click(tab);

// do something to controls,

// for example collect their names

foreach (var el in Walk(tab.NativeElement as AutomationElement))

{

elements += string.Format("Name: '{0}', Type: '{1}'\n", el.Current.Name, el.Current.ControlType.ProgrammaticName);

}

MessageBox.Show(elements);

}

// Recursively walk an automation tree

private List<AutomationElement> Walk(AutomationElement current)

{

var res = new List<AutomationElement>();

if (current != null)

{

res.Add(current);

res.AddRange(Walk(TreeWalker.RawViewWalker.GetFirstChild(current)));

res.AddRange(Walk(TreeWalker.RawViewWalker.GetNextSibling(current)));

}

return res;

}

TabControl

answered on 11 Apr 2013

1 answer

370 views

Change mouse-over background color?

When hovering property grid items, the background changes to whatever the theme uses as background. I believe this is caused by the MouseOver stuff in PropertyGridFieldTemplate:

<Rectangle x:Name="Background_Over" Grid.ColumnSpan="2" Fill="{telerik:Windows8TouchResource ResourceKey=MainForegroundBrush}" Opacity="0.05" HorizontalAlignment="Stretch" Visibility="{Binding IsMouseOver, Converter={StaticResource BooleanToVisibilityConverter}, RelativeSource={RelativeSource TemplatedParent}}" VerticalAlignment="Stretch"/>

Is it possible to change this style for my property grid? Our application allows for switching between themes, so it makes sense to base the styles on the current style of the desired type (i.e. BasedOn). Not sure if this is possible if we need to change the entire style.

So, two questions:
1) How do we change the hovering color? (I.e. on mouse over, we want to use the background color of the property grid. Maybe darkening it a bit.)
2) How do we remove the gray area to the left?

PropertyGrid

answered on 11 Apr 2013

3 answers

150 views

MapLine not working with inline syntax?

I have trouble with some of my map elements, for example MapLine.

When I use this syntax the MapLine is displayed in red and shows a tooltip when mouse is over.

<tel:MapLine

StrokeThickness="5"

Stroke="Red"

Point1="{Binding MyViewModel.Point1}"

Point2="{Binding MyViewModel.Point2}"

ToolTip="{Binding MyViewModel.ItemName}" />

When I use this syntax the MapLine is not displayed and there is no tooltip.

<tel:MapLine

StrokeThickness="5"

Point1="{Binding MyViewModel.Point1}"

Point2="{Binding MyViewModel.Point2}">

<tel:MapLine.Stroke>

<SolidColorBrush Color="Red" />

</tel:MapLine.Stroke>

<tel:MapLine.ToolTip>

<TextBlock Text="{Binding MyViewModel.ItemName}" />

</tel:MapLine.ToolTip>

</tel:MapLine>

Map

answered on 11 Apr 2013

1 answer

160 views

MapShape Location Binding

When I use binding to set the Location of a MapShape I always get an Error. What am I doing wrong?

<tel:MapRectangle Location="{Binding Location}" />

Exception:
A 'Binding' cannot be set on the 'Location' property of type 'MapRectangle'. A 'Binding' can only be set on a DependencyProperty of a DependencyObject.

Map

answered on 11 Apr 2013

1 answer

241 views

RadListBox highlight item from MVVM

Hi

I have one question. How can I highlight an item from ViewModel? I have simple MVVM scenario:

public class FooViewModel : ViewModelBase

{

private ObservableCollection<Foo> _fooCollection;

private Foo _selectedFoo;

private ICommand _addCommand;

public ObservableCollection<Foo> FooCollection

{

get { return _fooCollection; }

set

{

_fooCollection = value;

OnPropertyChanged("FooCollection");

}

public Foo SelectedFoo

{

get { return _selectedFoo; }

set

{

_selectedFoo = value;

OnPropertyChanged("SelectedFoo");

}

public ICommand AddCommand

{

get { return _addCommand ?? (_addCommand = new RelayCommand(i=>this.AddCommandMethod())); }

}

private void AddCommandMethod()

{

//Add item to collection

//Add item to SelectedFoo

}

In View I bind ItemSource to FooCollection, I am binding the SelectedItem of the RadListBox to SelectedFoo from VM and I have two TextBlocks to display the SelectedFoo. I have one button to Add a new Item to the Collection and setting the SelectedFoo to this new Item from Collection. Everything is fine, the two textblocks shows correct data, but the RadListBox is not highlighting the new Item Added to the collection. The collection rebinds fine because I can see the added item in list, but it is not highlighted.

Am I doing something wrong?? I tried to set the SelectedValue, SelectedValuePath, SelectedItem. I have google it a lot but no luck.

Thanks Vitalij

ListBox

answered on 11 Apr 2013

2 answers

184 views

RadListBox - PreviewDrop - how to get the datacontext of the item being dropped ?

I am using 2 listboxes with drag and drop enabled, 1 being the "source" and one being the "destination".
I need to manipulate the items in the "destination" RadListBox when a user drops an item from the "source" listbox; after a certain validation.

I wired the "PreviewDrop" event; but fail to see how I can get the datacontext of the element that is being dropped by the user.
(I worked through the properties of the DragEventArgs parameter; but couldn't find the datacontext of the item that is being dropped)

Does anyone know how to determine which item the user is dropping on my "destination" RadListBox ?

ListBox

answered on 11 Apr 2013

1 answer

143 views

DateTimeCategoricalAxis FormatException

I'm trying to use LabelFormat in DateTimeCategoricalAxis but an exception occurs when i use H format string. =>it's work with HH for example
I want to use h (just hour with one digit for 1,2,3...), ddd, d (just day for 1,2,3...) and MMM in final testing

Xaml View :

<telerik:RadCartesianChart>

<telerik:RadCartesianChart.HorizontalAxis>

<telerik:DateTimeCategoricalAxis LabelFitMode="None"

LabelFormat="H"

DateTimeComponent="Hour" />

</telerik:RadCartesianChart.HorizontalAxis>

<telerik:RadCartesianChart.VerticalAxis>

<telerik:LinearAxis />

</telerik:RadCartesianChart.VerticalAxis>

<telerik:LineSeries ItemsSource="{Binding}"

CategoryBinding="XValue"

ValueBinding="YValue"/>