Questions on UI for WinForms Forum

1 answer

104 views

I know you have issues with the scale values changing when I click Show Weekends, or change views. It's been noted in a few other threads. So, the questions are

Is it fixed in the new realease (2011Q1)?

What's the workaround?

Later
Art

Scheduler and Reminder

answered on 22 Mar 2011

8 answers

190 views

can't work with radcontrols after upgrade

Hello,

I just upgraded the newest release for winforms using the upgrade wizard and now i can't place any radcontrols on to the form nor can i select radcontrols already existing on my forms before the upgrade.

Please help,
francis

General Discussions

answered on 22 Mar 2011

5 answers

587 views

Selected Index Change

When populating a dropdownlist control the selected index changes, which triggers the action I have setup for the index changing... however when I initially populate the dropdownlist by setting a datatable as its datasource and defining the display and value members, the radDropDownList.SelectedItem.Value is a DataRowView object. After it's populated, though, the radDropDownList.SelectedItem.Value is an integer as it should be. Can this be explained to me why this is happening and the best way to work with it?

My code currently is this, and it will only work when I initially set the datasource:

private void someOtherMethod ()

{

sysParentDropDown.DataSource = dt;

sysParentDropDown.DisplayMember = "name";

sysParentDropDown.ValueMember = "panelid";

sysParentDropDown.SelectedIndex = -1;

}

private void sysParentDropDown_SelectedIndexChanged(object sender, Telerik.WinControls.UI.Data.PositionChangedEventArgs e)

{

if (this.sysParentDropDown.SelectedIndex > -1)

{

sysDeviceDropDown.Enabled = true;

try

{

sysDeviceDropDown.DataSource = null;

sysDeviceDropDown.Text = null;

sysInputDropDown.DataSource = null;

sysInputDropDown.Text = null;

DataRowView drv = (DataRowView)this.sysParentDropDown.SelectedItem.Value;

string s = "(panelid = " + drv.Row["panelid"].ToString() + ") AND (devid <> 0) AND (inputdevid = 0)";

DataRow[] foundRows = deviceNames.Select(s, "name asc");

DataTable dt = new DataTable("temp");

dt.Columns.Add("name");

dt.Columns.Add("devid");

foreach (DataRow dr in foundRows)

{

dt.ImportRow(dr);

}

DataRow row = dt.NewRow();

row["name"] = "";

row["devid"] = " ";

dt.Rows.InsertAt(row, 0);

sysDeviceDropDown.DisplayMember = "name";

sysDeviceDropDown.ValueMember = "devid";

sysDeviceDropDown.DataSource = dt;

}

catch (Exception ex)

{

MessageBox.Show(ex.Message);

}

else

{

sysDeviceDropDown.Enabled = false;

sysDeviceDropDown.SelectedText = null;

sysInputDropDown.Enabled = false;

sysInputDropDown.SelectedText = null;

}

Thanks for your time

DropDownList

answered on 22 Mar 2011

16 answers

588 views

[Solved] Remove empty line

hi,
I have a RadTextBox in MultiLine mode with a NullText. I add text with my code, but I have always a empty line at the end.
How can I remove that? Sounds as a pretty easy task, but for some reason it doesnot work for me, the empty line at the end is never removed.
Regards, Andreas

TextBox

answered on 22 Mar 2011

1 answer

101 views

Edit entity in dropdown column

Hello,

I have a scenario where I need to have cell text to display one databound field from an entity property, but when in edit mode I would like to use a dropdownlist to change the underlying entity itself and not the value being displayed.

For example my entity in simple terms is as follows:

Vehicle (Main databound entity)
-- Vehicle.Make (relates to Make entity)
-- Vehicle.Model (relates to Make entity)
-- Vehicle.Year (relates to Year entity)
-- Vehicle.Region (relates to Region entity)

Make
-- Make.MakeID
-- Make.MakeName

Model
-- Model.ModelID
-- Model.ModelName

Year
-- Year.YearID

Region
-- RegionID
-- RegionAbbr
-- RegionFullName

I would like to have for example a Region column that displays Region.RegionAbbr in the cell text, but when entering edit mode give a list bound to Region enities. These entries should be bound to a List<Region> and displaymember should be set to RegionAbbr for display purposes. When an entity is selected from the dropdown, instead of altering Region.RegionAbbr I would like to intercept the change and assign the Dropdownlist DataBoundItem to the Vehicle.Region entity.

Can this be done?

GridView

answered on 22 Mar 2011

1 answer

119 views

Rapid entry of new rows

Greetings,

After adding a new row, how can I place the cursor in the first column in the new row position? I have tried the following but it doesn't work:

private void gv_UserAddedRow(object sender, GridViewRowEventArgs e)

{

gv.CurrentRow = gv.MasterView.TableAddNewRow;

gv.CurrentColumn = gv.Columns[0];

gv.BeginEdit();

}

GridView

answered on 22 Mar 2011

7 answers

469 views

[Solved] Header back color

Hello,

I am trying to change color of the header cell in currently selected column. I tried to achieve this as it is done in this post Change of back color, however the header cells will start to react only if the user hovers with mouse over specified columns before he starts clicking into the grid.

Here is the code snippet I use

void electionChanged(object sender, EventArgs e)

{

if (SelectedCells.Count == 0)

return;

int index = SelectedCells[0].ColumnInfo.Index;

if (MasterGridViewInfo.TableHeaderRow.Cells[index].CellElement == null)

return;

for (int i = 0; i < Columns.Count; i++ )

MasterGridViewInfo.TableHeaderRow.Cells[i].CellElement.ResetValue(LightVisualElement.BackColorProperty);

MasterGridViewInfo.TableHeaderRow.Cells[index].CellElement.SetValue(

LightVisualElement.BackColorProperty, Color.Blue);

}

Can you please pinpoint where is the problem?

GridView

answered on 21 Mar 2011

4 answers

411 views

BeginUpdate, EndUpdate – meam leak becasue of event ThemeNameChanged.

Hi

Users of my app some time ago reported issue with memory leak, so I started investigation and it looks that there is problem with RadGridView.

This is my sample code:

public partial class Form1 : Form

{

BindingList<Package> _packages = new BindingList<Package>();

BindingList<PackageItem> _items = new BindingList<PackageItem>();

public Form1()

{

InitializeComponent();

radGridView1.DataSource = _packages;

radGridView1.ReadOnly = true

GridViewTemplate viewItemsTemplate = new GridViewTemplate();

viewItemsTemplate.DataSource = _items;

this

.radGridView1.MasterTemplate.Templates.Add(viewItemsTemplate);

GridViewRelation relation = new GridViewRelation(radGridView1.MasterTemplate);

relation.RelationName = "myRelation";

relation.ChildTemplate = viewItemsTemplate;

relation.ParentColumnNames.Add("Id");

relation.ChildColumnNames.Add("PackageId"

);

this.radGridView1.Relations.Add(relation);

_packages.Add(new Package() { Id = "1", Name = "Package1" });

_items.Add(new PackageItem() { Id = "1", PackageId = "1", Name = "Item1 in package1" });

_items.Add(new PackageItem() { Id = "2", PackageId = "1", Name = "Item2 in package1" });

_packages.Add(new Package() { Id = "2", Name = "Package2" });

_items.Add(new PackageItem() { Id = "3", PackageId = "2", Name = "Item1 in package2" });

_items.Add(new PackageItem() { Id = "4", PackageId = "2", Name = "Item2 in package2" });

radGridView1.BestFitColumns();

}

private void btnDelete_Click(object sender, EventArgs e)

{

radGridView1.BeginUpdate();

PackageItem pi = _items[0];

_items.Remove(pi);

radGridView1.EndUpdate();

}

When I delete row I call BeingUpdate() and EndUpdate(), this is needed – without these calls row is not deleted and after click on row exception is thrown.

The problem for sure is missing unhooking event RadGridView.ThemeNameChanged (I do not know if there are other missing unhooks).

TO SEE this problem before deleting row YOU HAVE TO expand child rows!

I used profiler and I have seen that there are types that hook this event and do not unhook after disposing! These types are: GridDetailViewCellElement, GridDetailViewRowElement, GridTableElement. You can check details in screen shots.

How can I solve this problem? This is really urgent issue for me – I have a lot of updates in my grid and after couple hours there is always out of memory exception caused by my app.

Regards

GridView

answered on 21 Mar 2011

3 answers

231 views

[Solved] DesktopAlert stealing focus

We use the Desktop Alerts quite extensive now, but something annoys me:
When RadDesktopAlerts became visible while i am editing in a RadTextBox it seems to steal the focus. I can still type letters but delete and return keys are disabled. When the RadDesktopAlert disappears (we use the autoclose property) the keyboard works again and i can continue with the TextBox. Is there something you can do to fix this in the next version? Or is there already a setting to keep the Alert in the background?

You can see the problem in your samples: Desktop Alert->Settings
Preview the Alert and edit in the "Delay" text box. You can add numbers but delete and return keys are redirected to the desktop alerts.

Best regards

Bernd

DesktopAlert

answered on 21 Mar 2011

2 answers

138 views

[Solved] GridView scrolling when line is inserted

Hello,
I'm working with a GridView in bound mode. It's bounded with a List which receives new rows during execution time. At a certain point, a new row is added, this row turns to be the selected one and the gridview scrolls. That's my problem: I want it to maintain the line (chosen previously by the user) as the one selected. But, this is not the beahaviour I'm getting, because every row which is added or updated becomes the one selected.
How can I make the selected row stay the same while adding this new rows to the bounded list?

Thanks,
Alexandre

GridView

answered on 21 Mar 2011