Questions on UI for WPF Forum

1 answer

213 views

I tried to set the new added row as the selected row, but have some strange effects.
In the grid I have set IsSynchronizedWithCurrentItem to true, because I want the arrow to follow the selected row (currentItem).
Also set the ShowInsertRow to true.

After the user has clicked on that row, filled in his information and presses the Enter key, I'd like to set this newly added row as the selected row with the Arrow (IsSynchronizedWithCurrentItem) also set to this row.

With AddingNewDataItem I create the new item with default values.

In the RowEditEnded I add this new object to the ObjectContext, save the changes in the context and do the following check:

if (e.Row is GridViewNewRow)

{

ScrollIntoView(grdDataGrid, e.Row.Item);

}

Then I have the ScrollIntoView function:

private void ScrollIntoView(RadGridView grd, object itmSel)

{

grd.SelectedItem = itmSel;

grd.ScrollIntoViewAsync(grd.SelectedItem, r =>

{

var row = r as GridViewRow;

if (row != null)

{

row.IsCurrent = true;

row.IsSelected = true;

row.Focus();

}

grd.CurrentItem = itmSel;

grd.CurrentCellInfo = new GridViewCellInfo(grd.SelectedItem, grd.Columns[0]);

});

}

It looks like it's working, but I still have the previous selected row ALSO having the Arrow mark. When I select a different row the newly selected row get the arrow mark, but my new added row keeps also having the arrow mark.
I need to select the new added row then select a different row to have it all working.

What's wrong here? Using WPF Q1 2012.

GridView

answered on 30 Mar 2012

2 answers

176 views

Null Reference exception in AxisX.cs:line 384

I have null reference exception with just simple code of charts components (components version 2011.2.920.35)

System.NullReferenceException occurred
Message=Object reference not set to an instance of an object.
Source=Telerik.Windows.Controls.Charting
StackTrace:
at Telerik.Windows.Controls.Charting.AxisX.CalculateItemRange(DataSeries dataSeries, Int32 index, Boolean shouldSubtractItemWidth) in c:\TB\102\WPF_Scrum\Release_WPF\Sources\Development\Controls\Chart\Chart\ChartArea\Axis\AxisX.cs:line 384
InnerException:

Code example

<telerik:RadChart Name="MonitoringChart" />

private void UserControl_DataContextChanged(object sender, DependencyPropertyChangedEventArgs e)

{

MonitoringChart.SeriesMappings.Clear();

var lineSeriesDefinition = new LineSeriesDefinition();

lineSeriesDefinition.ShowItemLabels = true;

lineSeriesDefinition.ShowItemToolTips = true;

lineSeriesDefinition.ItemToolTipFormat = "#Y at #X{dd-MMM-yy HH:mm:ss}";

lineSeriesDefinition.AxisName = item.Name;

var items = new List<DataPoint<object>>();

items.Add(new DataPoint<object>() { Time = DateTime.Now.AddMinutes(0), Value = 1 });

items.Add(new DataPoint<object>() { Time = DateTime.Now.AddMinutes(1), Value = 2 });

items.Add(new DataPoint<object>() { Time = DateTime.Now.AddMinutes(2), Value = 3 });

items.Add(new DataPoint<object>() { Time = DateTime.Now.AddMinutes(3), Value = 4 });

var seriesMapping = new SeriesMapping();

seriesMapping.ItemsSource = items; //item.Values;

seriesMapping.LegendLabel = item.Name;

seriesMapping.SeriesDefinition = lineSeriesDefinition;

seriesMapping.ItemMappings.Add(new ItemMapping() { FieldName = "Time", DataPointMember = DataPointMember.XValue });

seriesMapping.ItemMappings.Add(new ItemMapping() { FieldName = "Value", DataPointMember = DataPointMember.YValue });

MonitoringChart.SeriesMappings.Add(seriesMapping);

}

public class DataPoint<T>

{

public DataPoint()

{

}

public DataPoint(T value, DateTime time)

{

Value = value;

Time = time;

}

public T Value { get; set; }

public DateTime Time { get; set; }

}

Chart

answered on 29 Mar 2012

5 answers

561 views

SelectAll Checkbox option inside combobox

Hi All,

I was able to put checkbox for all combobox items. Now I need to have a SelectAll checkbox as the first option inside the combobox. I was successful in that as well. But I would like to know the currently selected checkbox item from the Method bounded to the Command of the checkbox otherwise the SelectAll option will not work as expected.

<

DataTemplate x:Key="RowItemDataTemplate">

<CheckBox x:Name="rowCheckbox" Margin="2,2"

Command="{Binding Path=DataContext.RowCheckCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ItemsControl}}}"

Content="{Binding Path=RowName}"

IsChecked="{Binding Path=IsSelected, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />

</DataTemplate>

<

ComboBox Grid.Row="0" Grid.Column="2" x:Name="cboRows" Style="{DynamicResource ValidatingComboBox}"

ItemsSource="{Binding RowItems}"

ItemTemplate="{StaticResource RowItemDataTemplate}"

Text="{Binding SelectedRowsText}"

IsEditable="True" Margin="5,0,0,0"

IsReadOnly="True"

MaxDropDownHeight="140"/>

public

ICommand RowCheckCommand

{

get

{

if (_rowCheckCommand == null)

{

_rowCheckCommand =

new RelayCommand(

param => RowCheckBoxChanged(),

param =>

true

);

}

return _rowCheckCommand;

}

public

void RowCheckBoxChanged()

{

NotifySelectedRowsText();

}

Is there a way, that i can pass the currently selected checkbox item to RowCheckBoxChanged() method?
I had been doing this in wpf combobox. Since i can't find any solution to my problem, i was thinking to shift to Telerik combobox, if it can solve my problem.

Any idea/suggestion will be greatly appreciated.

Regards

SVP

ComboBox

answered on 29 Mar 2012

1 answer

249 views

Cancel Row Insert

I have a grid on a screen that ShowInsertRow is set to true. When the user can add data and when they leave that row I have a RowEditEnded method that inserts the data into the database. If the insert fails or they do not add any new data nothing new is inserted into the database, but the row on the screen is still there. Is there a way to remove that new row if no data was entered.

GridView

answered on 29 Mar 2012

2 answers

127 views

Checking Multiple Checkboxes in different columns of RadGridView

Hello All,

I have a RadGridView with two columns of Checkboxes. If the user Checks the Checkbox in Column B, I would like to also have the Checkbox in Column A automatically check itself. Is this possible? I've been playing around in the code for the Checkbox_Click event, but have not had much success. Any help would be much appreciated.

Thanks in advance,
Kiet

GridView

answered on 29 Mar 2012

2 answers

162 views

HeaderCellStyle and metro theme

Hi all,

I have a problem with custom headercellstyle and applied theme.
I generate grid columns in runtime, and affect a style on header cell to set tooltip property.

var headerStyle = new Style(typeof(GridViewHeaderCell));

headerStyle.Setters.Add(new Setter(GridViewHeaderCell.ToolTipProperty,

new Binding("HeaderToolTip") { Source = columnModel }));

column.HeaderCellStyle = headerStyle;

My grid use the metro theme but header are using the default theme (office black). If I comment previous code snippet, header use the metro theme.
What am I doing wrong?

GridView

answered on 29 Mar 2012

3 answers

159 views

Customisation of Plot Area

With the RadChart control, it is possible to get hold of the plot area and enable disable custom grid lines to identify mouse cursor position.

I want to acheive the same thing with the RadChartView. Is it possible. I know you have the "ChartTrackBallBehavior" facility, but I want to be able to control how it works. e.g. I want it to remain when mouse not over the chart, and would prefer its operation to run a mouse action such as RightMouseDown.

Thanks
Craig

ChartView

answered on 29 Mar 2012

3 answers

120 views

Issue with ItemsPerPage

When I set this number greater than the amount of items in the carousel, nothing shows up. The carousel controls show, just none of the items. I set the number to what looks good, but then when users delete data, the items are gone. Any ideas?

Thanks,
David Ribb

Carousel

answered on 29 Mar 2012

1 answer

104 views

e.Order in Dataform_AutoGeneratingField

Hello,

My business object properties have a attribute DisplayIndex and I want to set the order of my datafields to this displayindex.

DisplayIndexAttribute displayIndexAtt;
if (property.TryGetAttribute<DisplayIndexAttribute>(out displayIndexAtt))
            {

                e.Order = displayIndexAtt.index;
            }

This is working fine. But the problem is that not all properties have the displayindex attribute, so for some properties e.Order is null. I expected that these properties are displayed at the end of the dataform, but instead they are at the beginning.

Is there a way to change this behavior in the way that the properties without an explicit order will be at the end of the Dataform?

DataForm

answered on 29 Mar 2012

1 answer

138 views

ValueChanged event and error on WPF application start.

Hello!

I have problem. I placed RadNumericUpDown control and set its value to 15 for default.
Now, I added event for ValueChanged:

private void FVSdValue_ValueChanged(object sender, RadRangeBaseValueChangedEventArgs e)

{

HSdValue.Value = 0.2 * FVSdValue.Value;

}

When I start application I'm getting NullReferenceException - the object couldn't be found (Object reference not set to an instance of an object.)

This happens also for other controls. What am I doing wrong?

The HSdValue is also RadNumericUpDown, located below the FVSdValue.

General Discussions

answered on 29 Mar 2012