Questions on UI for WinForms Forum

3 answers

143 views

Hello everyone,

I have used RadItemDragDropManager class from sample application to achieve drag&drop effect between two ListControls.
If I use mouse on PC, it works perfectly, but it is not working on touchscreen.
I saw, that in many places in RadItemDragDropManager class there are events associated with mouse.
Is there any simple solution for use this/other class to achieve drag&drop between two lists in WinForms applications?

DropDownList

answered on 18 Sep 2013

0 answers

182 views

Scroll Bar get disappear when change the display setting

Hi Experts,

I am using Telerik.Windows.Controls.GridView , version - 2011.3.1220.40.

I am having problem with scroll bar when I change my machine's display setting from 100% to 125%.

Initially scroll bar appears on the screen, but when I scroll down to bottom and try to scroll more (as it has more rows), scroll bar gets disappear.
I have attached screenshot. Also I have attached Grid Control we have used.

here is the grid control I have used-

<telerik:RadGridView x:Name="xyzResultsGridView"

Controls:StyleManager.Theme="Office_Blue"

AutomationProperties.AutomationId="xyzResultsGridView"

AutoGenerateColumns="False"

AutoExpandGroups="True"

CanUserFreezeColumns="False"

AllowDrop="False"

CanUserDeleteRows="False"

ActionOnLostFocus="None"

AreRowDetailsFrozen="True"

CanUserInsertRows="False"

ClipToBounds="True"

IsScrolling="False"

UseLayoutRounding="True"

SelectionMode="Extended"

ClipboardPasteMode="Default"

IsReadOnly="True"

IsFilteringAllowed="False"

VirtualizingStackPanel.IsVirtualizing="True"

VirtualizingStackPanel.VirtualizationMode="Recycling"

MaxWidth="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Grid}}, Path=ActualWidth}"

Focusable="False"

>

<telerik:RadGridView.RowStyle>

<Style TargetType="GridView:GridViewRow">

<Setter Property="Foreground" Value="{Binding Converter={StaticResource RowToColorConverter},ConverterParameter=.}">

</Setter>

<Setter Property="FontWeight" Value="{Binding Converter={StaticResource RowToFontWeightConverter},ConverterParameter=.}">

</Setter>

</Style>

</telerik:RadGridView.RowStyle>

<Navigation:RadContextMenu.ContextMenu>

<Navigation:RadContextMenu x:Name="xyzResultsGridContextMenu" Opened="xyzResultsGridContextMenu_Opened"

ItemClick="xyzResultsGridViewContextMenuItemClick"

ItemContainerStyle="{StaticResource EnableStyle}"

ItemTemplate="{StaticResource MenuItemTemplate}">

</Navigation:RadContextMenu>

</Navigation:RadContextMenu.ContextMenu>

<telerik:RadGridView.GroupHeaderTemplate>

<DataTemplate>

<Grid>

<Grid.ColumnDefinitions>

<ColumnDefinition/>

</Grid.ColumnDefinitions>

<TextBlock Text ="{Binding GroupDescriptor.Column.Header}" Margin="1,0,0,0" Grid.Column="0" />

<TextBlock Text=": " Margin="1,0,0,0" Grid.Column="1"/>

<TextBlock Text= "{Binding Header}" Margin="1,0,0,0" Grid.Column="2" />

</Grid>

</DataTemplate>

</telerik:RadGridView.GroupHeaderTemplate>

</telerik:RadGridView>

Can you please help me ?
Thanks,
Ritesh

GridView

asked on 17 Sep 2013

3 answers

596 views

Object reference not set to an instance of an object. at Telerik.WinControls.UI.GridViewEditManager.OnPositionChanging

Telerik.WinControls.GridView version 2012.3.1211.20

Hi Everyone,

I am using GridView's RowSourceNeeded to populate child table when [+] is clicked... it works fine when initial load, however when master table gets refreshed by assigning the DataSource to different collection, it throws following error when [+] is clicked to populate child table.
It seems the child table was populated OK, but it still throws the exception anyway.

Any help/suggestions/ideas are appreciated greatly. Thank you.

System.NullReferenceException: Object reference not set to an instance of an object.
   at Telerik.WinControls.UI.GridViewEditManager.OnPositionChanging(PositionChangingEventArgs args)
   at Telerik.WinControls.UI.GridViewEditManager.Telerik.WinControls.UI.IGridViewEventListener.PreProcessEvent(GridViewEvent eventData)
   at Telerik.WinControls.UI.GridViewEventProcessEntity.ProcessCollection(GridViewEvent gridEvent, PriorityWeakReferenceList list, GridEventProcessMode processMode)
   at Telerik.WinControls.UI.GridViewSynchronizationService.NotifyListeners(GridViewEvent gridEvent)
   at Telerik.WinControls.UI.GridViewSynchronizationService.FlushEvents()
   at Telerik.WinControls.UI.GridViewSynchronizationService.DispatchEvent(GridViewEvent gridEvent)
   at Telerik.WinControls.UI.GridViewSynchronizationService.RaiseCurrentChanged(GridViewTemplate template, GridViewRowInfo row, GridViewColumn column, Boolean user)
   at Telerik.WinControls.UI.GridViewRowInfo.OnIsCurrentPropertyChanging(PropertyChangingEventArgsEx args)
   at Telerik.WinControls.UI.GridViewRowInfo.OnPropertyChanging(PropertyChangingEventArgsEx args)
   at Telerik.WinControls.UI.GridViewHierarchyRowInfo.OnPropertyChanging(PropertyChangingEventArgsEx args)
   at Telerik.WinControls.UI.GridViewRowInfo.SetBooleanProperty(String propertyName, Int32 propertyKey, Boolean value)
   at Telerik.WinControls.UI.MasterGridViewTemplate.ChangeCurrentRow(GridViewRowInfo oldRow, GridViewRowInfo row, GridViewTemplate viewTemplate)
   at Telerik.WinControls.UI.MasterGridViewTemplate.SetPositionCore(GridViewRowInfo newRow, GridViewColumn newColumn, GridViewRowInfo oldRow, GridViewColumn oldColumn, Boolean validateRowChange)
   at Telerik.WinControls.UI.MasterGridViewTemplate.SetPosition(GridViewRowInfo row, GridViewColumn column, Boolean validateRowChange)
   at Telerik.WinControls.UI.MasterGridViewTemplate.ProcessCurrentChanged(GridViewEvent eventData)
   at Telerik.WinControls.UI.MasterGridViewTemplate.ProcessEventCore(GridViewEvent eventData)
   at Telerik.WinControls.UI.GridViewEventProcessEntity.ProcessCollection(GridViewEvent gridEvent, PriorityWeakReferenceList list, GridEventProcessMode processMode)
   at Telerik.WinControls.UI.GridViewSynchronizationService.NotifyListeners(GridViewEvent gridEvent)
   at Telerik.WinControls.UI.GridViewSynchronizationService.FlushEvents()
   at Telerik.WinControls.UI.GridViewSynchronizationService.DispatchEvent(GridViewEvent gridEvent)
   at Telerik.WinControls.UI.GridViewSynchronizationService.RaiseCurrentChanged(GridViewTemplate template, GridViewRowInfo row, GridViewColumn column, Boolean user)
   at Telerik.WinControls.UI.BaseGridNavigator.SelectCore(GridViewRowInfo row, GridViewColumn column)
   at Telerik.WinControls.UI.GridRowBehavior.SelectPositionOnMouseDownLeft(MouseEventArgs e, GridRowElement rowElement, GridCellElement cellElement)
   at Telerik.WinControls.UI.GridRowBehavior.OnMouseDownLeft(MouseEventArgs e)
   at Telerik.WinControls.UI.GridRowBehavior.OnMouseDown(MouseEventArgs e)
   at Telerik.WinControls.UI.BaseGridBehavior.OnMouseDown(MouseEventArgs e)
   at Telerik.WinControls.UI.RadGridView.OnMouseDown(MouseEventArgs e)
   at System.Windows.Forms.Control.WmMouseDown(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at Telerik.WinControls.RadControl.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

GridView

answered on 17 Sep 2013

4 answers

158 views

I' Can't create subGrid

Hello people:

I tried to create my first subird with winforms and I have not gotten.

I created the "radgrid1" and chose the datasource. Good.
Later i created the template and chose the DataSource.
Later i created the relation, parent = grid and select column id; child = template and selected column jwId.

Them, when the next line fire, i get a error "GridViewEventDataProvider can not be applied to bound GridViewTemplate"

this.radGridView1.Templates[0].HierarchyDataProvider = new GridViewEventDataProvider(this.radGridView1.Templates[0])

What it's the problem?

GridView

answered on 17 Sep 2013

2 answers

400 views

GridView CellValidating event fires more than once

Hi Everyone,

I have a problem with CellValidating event.

GridView CellValidating event fires more than once when NewRowEnterKeyMode property sets to RadGridViewNewRowEnterKeyMode.EnterMovesToNextCell.

I have messagebox in CellValidating event to check the value could not be empty.
when I try press enter key to leave cell, CellValidating event fires Twice. While there is a need a time validate. as a result messgebox shown Twice

please pay attention only when

1. NewRowEnterKeyMode sets to RadGridViewNewRowEnterKeyMode.EnterMovesToNextCell
2. Press Enter Key to move next cell ( Tab Key behavior is great)

I am very grateful everyone help me.
Thank You.

GridView

answered on 17 Sep 2013

1 answer

269 views

Saving gridview with combobox columns giving null values

Hello Telerik Team,
i have some issues with the comobobox column of radgridview for winforms

here is the below code

                GridViewComboBoxColumn colLithography = new GridViewComboBoxColumn();
                colLithography.DataType = typeof(string);
                colLithography.DataSource = dt; // dt is having only one Column called Name
                colLithography.HeaderText = "Lithography";
                colLithography.ValueMember = "Name";
                colLithography.DisplayMember = "Name";
                colLithography.FieldName = "Name";
                //colLithography.DataType=
                this.rGVPP.Columns.Insert(2, colLithography); // rGVPP is Radgridview

Above code perfectly added the values to the combobox

but now i want to save the gridview data to database,

So in Btn_Save click i am reading sending the gridview values to a query like below, observe the debug at break point which is the code
and in the quick watch window the value is null, throwing exception here

but my grid having values in all the cell, when i try to read the value of a particular cell of combobox column, its giving null value.

Please help me.

GridView

answered on 17 Sep 2013

3 answers

96 views

MiniToolbar in Ribbon Application

Hi ,

We need the MiniToolbar for our application.
Where can we find information about RadRibbonBar and MiniToolbar ?

I hope you will be able to provide the information.

Stefano.

General Discussions

answered on 17 Sep 2013

1 answer

120 views

RadGridView - Custom sorting issue

Hi,

I am using Telerik RadGridView in our project.

This GridView will have dropdown columns.  While doing sorting it sorts based on dropdown list item's Id instead of Display text.

So i am doing custom sorting to sort based on display member. It works fine.

If the record count is huge say for example more than 10,000 application is not responding.

Is there any workaround for this issue ?

Thanks

Balaji

GridView

answered on 16 Sep 2013

3 answers

351 views

RadCalendar current month and year

Hi,

is there a way to know the current month and year in the RadCalendar ViewChanged event?

Thanks in advance.

Esteban Diaz
Software Analist

Calendar, DateTimePicker, TimePicker and Clock

answered on 16 Sep 2013

6 answers

291 views

Visibilty of text in RadStatusStrip Item (RadLabelElement)

Hi,

I am using RadStatusStrip on a form and it has three RadLabelElement on it, these labels are used to display text and images at run-time. All three have spring property set to true and there are two separators in between them. Now the problem is, when a text is added at run time to a label and this text has a size larger than the current width of the label, the text exceeds from the width of the label and overlaps on the next label area i.e. the exceeded part of text is displayed on the separator and on next label area. I tried to handle it with different values of RadLabelElement property TextWrap but of no use. Also the back color of the RadLabelElement is set to transparent. Can you please give me any solution for that. I need that the exceeded part of the text, whose length is greater than label's width, is not displayed instead only initial part of that text is displayed (as same behavior found in the vs.net's status strip control.

Thanks and regards,

Hassan

StatusStrip

answered on 16 Sep 2013