Questions on UI for WPF Forum

1 answer

244 views

I'm extending the RadDatePicker. I have implemented a new property that tells whether the text input in the DatePicker is valid (that is if can be parsed to a DateTime):

/// <summary>

/// Tells whether the input in the TextBox of this DatePicker is valid. This property is

/// updated continously as the user types in the TextBox.

/// </summary>

public bool IsInputValid

{

get

{

return (bool)GetValue(RadDatePickerExtended.IsInputValidProperty);

}

set

{

SetValue(RadDatePickerExtended.IsInputValidProperty, value);

}

public static readonly DependencyProperty IsInputValidProperty = DependencyProperty.Register("IsInputValid", typeof(bool), typeof(RadDatePickerExtended), new FrameworkPropertyMetadata(true));

I'm setting the value of this property in an event handler for the ParseDateTimeValue event:

private void RadDatePickerExtended_ParseDateTimeValue(object sender, ParseDateTimeEventArgs args)

{

//If RadDatePicker could not parse the input...

if (!args.IsParsingSuccessful)

{

//HERE I DO SOME EXTRA PARSING FOR INPUT THAT I WANT TO SUPPORT

//BUT THAT IS NOT SUPPORTED BY RadDatePicker. IN ALL CASES

//WHERE THE PARSING IS SUCCESFUL AND A DATETIME IS SET, I

//ALSO SET args.IsParsingSuccessful TO TRUE.

IsInputValid = args.IsParsingSuccessful;

}

else

{

//The input was succesfully parsed by the default parsing in the RadDatePicker.

IsInputValid = true;

}

This seems to work fine. But the problem is that if the user deletes the text in the input the event is NOT dispatched and thus my method is not executed. If the user provides some invalid input so that my IsInputValid property is set to false and then clears the input, IsInputValid will still be false! I want to set it to true when the input is empty (this will mean that the value of the DatePicker is null which is allowed in my case).

So my question is: Is it possible to get notified in some way when the input is cleared by the user?

DatePicker

answered on 21 Jan 2011

1 answer

163 views

Handling RadButton return key press

I am currently trying to handle the return key press for a RadButton control via the PreviewKeyDown event but am unable to. I can successfully handle other keystrokes, such as function keys, however the event is not raised when the return key is pressed. I can only assume that this is because the return key is seen as an access key and so handled elsewhere. Is there a way to turn this off or bypass it so that I can handle the return key for myself?

Buttons

answered on 21 Jan 2011

1 answer

110 views

[Solved] RadTreeListView - DropExpandDelay

Hello,

I woud like to auto expand an unexpanded RadTreeListView row when the user's dragging an item and pass over the row. Is there any properties like the DropExpandDelay or a small workaround ?

For the moment I can do this in the OnDropQuery method but I'd like to add a certain delay before the row expands.

Thanks.

GridView

answered on 21 Jan 2011

1 answer

35 views

how to change xcategory of Area3DSeriesDefinition

I'm using the chart of Area3DSeriesDefinition,in the example, the axis-X value is auto generated, now , I want to change the axis-x value,how can i do it ?
I have tried to use DataSeries as bellow, but axis-x is not changed
   DataSeries dataSerie = new DataSeries();
   dataSerie.Definition = new Area3DSeriesDefinition() { ShowItemLabels = true };
   dataSerie.Add(new DataPoint() {XCategory ="A", YValue = 1});
   dataSerie.Add(new DataPoint() { XCategory = "b", YValue = 10 });
   RadChart1.DefaultView.ChartArea.DataSeries.Add(dataSerie);

Chart

answered on 21 Jan 2011

1 answer

108 views

how to set height of restored items

Hi,

is there a way how to prevent tileview to set height of restored items automatically to be proportional according to whole tileview? I need to set height for each restored item. I guess that this can be done using custom style, but I am not able to access the restored items from style xaml.

Thanks in advance,
Petr

TileView

answered on 21 Jan 2011

3 answers

342 views

Changing appearance of tabs in RadPaneGroup

Hi

I'm trying to figure out how to chance the appearance of the tabs in a RadPaneGroup.

I open my project in Blend, and select the RadPaneGroup I want to change in the Objects and Timeline pane. Selecting 'Edit Additional Templates', I then choose Edit Bottom Template -> Edit A Copy, and choose a name, and put the new Template into a new xml file.

Now, I can figure out how to do some things, such as change the tabs to appear at the top, rather than the bottom, but cannot see how to change the look of the tabs. Where do I need to look to do this?

Thanks
Tom Davies

Docking

answered on 21 Jan 2011

7 answers

138 views

What does the parser accept?

Hello,

Looking for a list of words/numbers/symbols the RadDatePicker control accepts out-of-the-box. We're currently using version 2010.1.603.35. Looked in the documentation and didn't see anything.

Thanks much,
~Boots

DatePicker

answered on 21 Jan 2011

1 answer

87 views

Null reference exception in radchart with camera extension

Hi I'm using the latest 2010 release.
On my window I have a radchart with Pyramid3DSeriesDefinition.
In my code I'm adding the the camera extension but it gives me a null reference exception on runtime.

at Telerik.Windows.Controls.Charting.CameraExtension.CalculatePointProjection(Point point)

at Telerik.Windows.Controls.Charting.CameraExtension.InitialTransformUpdate()

at Telerik.Windows.Controls.Charting.CameraExtension.ChartAreaUpdatedTimerElapsed(Object sender, EventArgs e)

at System.Windows.Threading.DispatcherTimer.FireTick(Object unused)

at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)

at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)

at System.Windows.Threading.Dispatcher.WrappedInvoke(Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

at System.Windows.Threading.DispatcherOperation.InvokeImpl()

at System.Threading.ExecutionContext.runTryCode(Object userData)

at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)

at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)

at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)

at System.Windows.Threading.DispatcherOperation.Invoke()

at System.Windows.Threading.Dispatcher.ProcessQueue()

at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)

at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)

at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)

at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)

at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)

at System.Windows.Threading.Dispatcher.WrappedInvoke(Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)

at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)

at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)

at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)

at System.Windows.Application.RunInternal(Window window)

at System.Windows.Application.Run()

Above mentioned is the stack trace.
Below mentioned is the code that I'm using in the radChart_Loaded event.

var cameraExtension = new CameraExtension();
radChart.DefaultView.ChartArea.Extensions.Add(cameraExtension);

Chart

answered on 21 Jan 2011

6 answers

441 views

[Solved] Setting SelectedDates

Hi,
Hopefully a quick question:
With the calendar control there is a SelectedDate property which allows me to get/set a date to be highlighted/selected. However i need to highlight/select a daterange from code. There is a selectedDates property, which allows you to get a List<DateTime> of selected dates, however i need to set this. Is there a way to do this?
Many thanks,

Calendar

answered on 21 Jan 2011

4 answers

321 views

Trend line on scatter chart

Is it possible to do a trend line on a scatter chart?

Chart

answered on 21 Jan 2011