Questions on UI for WinForms Forum

1 answer

97 views

Breaking Changes in the 2008 Q2 GridView Event Model

After upgrading to 2008 Q2 my application crashes in several grid event handlers.

For example the CellFormatting event is now also fired for the Filter Row and when the event handler wants to get the data for the cell, it's obviously Null when the grid loads and no filter is set.

If there are there are other breaking changes to the Grid, please update the documentation.

Worked Pre Q2:

    
                   void _grid_CellFormatting(object sender, CellFormattingEventArgs e)  
        
                    {  
        
                        if (e.CellElement.ColumnInfo is GridViewDataColumn && !(e.CellElement.RowElement is GridTableHeaderRowElement))  
        
                        {  
        
                            GridViewDataColumn column = (GridViewDataColumn)e.CellElement.ColumnInfo;  
        
                            if (column.FieldName == "Minutes")  
        
                            {  
        
                                int minutes = (int)e.CellElement.RowInfo.Cells["Minutes"].Value;  
        
                                TimeSpan ts = TimeSpan.FromMinutes(minutes);  
        
                                e.CellElement.Text = string.Format("{0:00}:{1:00}", ts.Hours, ts.Minutes);

Now have to add an additional test (plus additional test of NULL returned by the DB which is not currently possible by the Data Definition).

    
                  void _grid_CellFormatting(object sender, CellFormattingEventArgs e)  
        
                    {  
        
                        if (e.CellElement.ColumnInfo is GridViewDataColumn && (!(e.CellElement.RowInfo is GridViewFilteringRowInfo)) &&                                  
        
                            (!(e.CellElement.RowElement is GridTableHeaderRowElement)))  
        
                        {  
        
                            GridViewDataColumn column = (GridViewDataColumn)e.CellElement.ColumnInfo;  
        
                            if (column.FieldName == "Minutes")  
        
                            {  
        
                                if(e.CellElement.RowInfo.Cells["Minutes"].Value!=null)  
        
                                {  
        
                                    int minutes = (int)e.CellElement.RowInfo.Cells["Minutes"].Value;  
        
                                    TimeSpan ts = TimeSpan.FromMinutes(minutes);

regards
Erwin

GridView

answered on 06 Jul 2009

9 answers

663 views

Reset layout to default

Hello,

Is there an easy way to reset the Grid Layout to its default layout?

Thanks,
Tommy

GridView

answered on 06 Jul 2009

5 answers

131 views

[Solved] Selecting date twice leads to 1980/01/01

Hello Telerik Team,

I encountered this issue: If you
- open a RadDateTimePicker
- select a date
- open it again and
- select the same date again,
the picker will show January the 1st, 1980.

Have a nice weekend,
STB

Calendar, DateTimePicker, TimePicker and Clock

answered on 06 Jul 2009

2 answers

246 views

[Solved] Cell format

I have an image cell where the image is added conditionally using CellFormatting:

Private Sub RadGridView1_CellFormatting(ByVal sender As System.Object, ByVal e As Telerik.WinControls.UI.CellFormattingEventArgs) Handles RadGridView1.CellFormatting

Try

If e.CellElement.ColumnIndex = 1 Then

If CType(e.CellElement.RowInfo.Cells("type").Value = 0, Decimal) Then

e.CellElement.Image = Me.ImageList1.Images(0)

ElseIf CType(e.CellElement.RowInfo.Cells("type").Value = 1, Decimal) Then

e.CellElement.Image = Me.ImageList1.Images(1)

ElseIf CType(e.CellElement.RowInfo.Cells("type").Value = 2, Decimal) Then

e.CellElement.Image = Me.ImageList1.Images(2)

ElseIf CType(e.CellElement.RowInfo.Cells("type").Value = 3, Decimal) Then

e.CellElement.Image = Me.ImageList1.Images(3)

Else

e.CellElement.Image = Me.ImageList1.Images(3)

End If

e.CellElement.DrawFill = True

If Not IsDBNull(e.CellElement.RowInfo.Cells("Status").Value) Then

e.CellElement.DrawFill = True

Select Case (e.CellElement.RowInfo.Cells("Status").Value)

Case 23

e.CellElement.BackColor = Color.Pink

Case 24

e.CellElement.BackColor = Color.Chartreuse

Case 25

e.CellElement.BackColor = Color.Yellow

Case 26

e.CellElement.BackColor = Color.SkyBlue

Case 27

e.CellElement.BackColor = Color.LightCyan

Case 28

e.CellElement.BackColor = Color.Crimson

Case 29

e.CellElement.BackColor = Color.Blue

Case 30

e.CellElement.BackColor = Color.Red

Case Else

End Select

Else

e.CellElement.BackColor = Color.WhiteSmoke

End If

Catch ex As Exception

MsgBox(Err.Description)

End Try

End Sub

This colours the whole row I only want the background behind the image to have the colour applied how do I do this?

Regards
Joe

GridView

answered on 04 Jul 2009

7 answers

733 views

[Solved] WrapText and AutoSizeRows = true

Hello,

Q1 2009 Winform controls.

I am having a little trouble with wrapping text and autosizing rows. I have a gridview on a form with a checkbox at the top to define whether to show the full cell text or not.

As far as wrapping text and the rows autosizing, I cannot even get this to work correctly. The problems are:

1..Wrapping of text and resizing of rows only seems to work correctly if the line this.radGridViewExceptions.MasterGridViewTemplate.AutoSizeColumnsMode = Telerik.WinControls.UI.GridViewAutoSizeColumnsMode.Fill; is not commented out. If this is commented out and I set the column widths in the swtich, the description column, which has the most text, only shows 2 lines of text fully. The 3rd and final line in that cell shows about 10% of the top of the 3rd line, the rest is cut off.

2..The cursor changes to an arrow pointing up and down, like it is going to let me resize the row, but I cannot resize it even though AllowResize is set to true in the designer properties

3...My functional requirement is that on clicking the checkbox to not show full text, the rows go back to only show one line of text and do not wrap. So in the event handler for the checkbox I go through the columns in the grid and set WrapText to the checked state of the checkbox. This either enables or disables wrapping ok, but the row height when going from wraptext =true to wraptext = false does not change so I am left with thick and thin rows. I want all rows to be thin, ie all the same height.

Thanks in advance,

My code is below:

    
                 private void SetupForm() 
        
                    { 
        
                        try 
        
                        { 
        
                            // Add the events 
        
                            this.radGridViewExceptions.ViewCellFormatting += new Telerik.WinControls.UI.CellFormattingEventHandler(radGridViewExceptions_ViewCellFormatting); 
        
                            this.radGridViewExceptions.DataSource = m_objExceptions.GetLast30DaysExceptions(); 
        
                            // Wrapping text only seems to work correctly if this is not commented out

                            // and I do not set the column widths below

                            // this.radGridViewExceptions.MasterGridViewTemplate.AutoSizeColumnsMode = Telerik.WinControls.UI.GridViewAutoSizeColumnsMode.Fill; 
        
                            this.radGridViewExceptions.MasterGridViewTemplate.AllowColumnReorder = false; 
        
                            this.radGridViewExceptions.MasterGridViewTemplate.AllowColumnResize = false; 
        
                            this.radGridViewExceptions.AutoSizeRows = true; 
        
                            // Format the columns 
        
                            foreach (GridViewColumn column in radGridViewExceptions.Columns) 
        
                            { 
        
                                switch (column.HeaderText) 
        
                                { 
        
                                    case "When_Occured": 
        
                                    case "Description": 
        
                                        column.Width = 200; 
        
                                        break; 
        
                                    case "App_Assembly": 
        
                                        column.Width = 120; 
        
                                        break; 
        
                                    case "App_Assembly_Version": 
        
                                        column.Width = 150; 
        
                                        break; 
        
                                    default: 
        
                                        column.Width = 100; 
        
                                        break; 
        
                                } 
        
                                column.WrapText = true; //radCheckBoxShowFullText.Checked; 
        
                            } 
        
                            m_bFormLoaded = true; 
        
                        } 
        
                        catch (Exception ex) 
        
                        { 
        
                            ShowException(ex); 
        
                            m_bFormLoaded = false; 
        
                        } 
        
                    }

GridView

answered on 03 Jul 2009

1 answer

238 views

Using a non-Telerik usercontrol in the gridview/wrapping a usercontrol in a RadElement wrapper? (C#)

Hi

I'm on a tight schedule and have put many hours of work into a usercontrol that does a bunch of stuff, automatic syntax highlighting based on list and db lookups, validation as you type and so on and so forth.

I did all of this on the assumption that, like the control set I worked with in my previous job, the Telerik Grid would provide some means of created a custom column that used my control.

However, having started work on the actual grid, I can find no way of doing this. After my initial efforts bore no fruit I searched extensively for ways of doing it both here and elsewhere on the Web and found nothing.

The code fragments I have found all require that one uses a class that is inherited from RadElement. Since the control I have, which represents many hours of work, is already written and I'm on a tight schedule, I _don't_ want to rewrite the whole thing from scratch based on a RadElement derived control. And C# doesn't allow multiple inheritance.

So the only thing I can think of is to somehow wrap my usercontrol in a class inherited from RadElement. My assumption is that it is possible to override certain painting and editing events inherited from the RadElement class so that they present my usercontrol. But the documentation of RadElement's members is kinda minimal - auto-documented code minimal. There's no explanation of what any of the events or functions are FOR, just descriptions of their signatures.

Is what I'm attempting possible? If so, how do I proceed?

Thanks in anticipation :)

GridView

answered on 03 Jul 2009

1 answer

174 views

Why is this so hard?

Hi!

I have been working for 2 days now trying to solve a basic "2 way binding" problem but I'm about to give up.
Is this possible with todays RadGridView?

We are working on a enterprise application with a n-tire layer architecture.

Data Access Layer
Business Logic Layer
GUI

The Data Access Layer is using Linq2SQL to get the data from the database and then passes the linq objects to the business layer and then the gui layer.
In the gui layer we have a RadGridView.

The RadGridView is readonly from start.
After the user clicks on a "Start edit" button, the RadGridView can be edited.

I want the user to be able to edit fields, remove rows and add new rows but nothing should be changed in the database until the user presses the button "Save changes".

Can this be done?
Can someone please send me a "best practice" example for this, I cannot be the only one looking for this?

Regards,
Per Bornsjö

GridView

answered on 03 Jul 2009

1 answer

213 views

Scrolling to previous selection

Hi, I have a RadGridView that is bound to a DataTable.
I refresh the data binding every 30 seconds.
Currently before I refresh I store the currently selected rows and reselect them on rebinding to make the user experience as seamless as possible.
This works fine until I have enough items to cause it to scroll. When I have items selected at the bottom of the list, on refresh the selection disappears even though I have it added to the selectedrows collection, and the scrollbar is at the top with the item out of view. When I manually scroll down, I see that my previous selection has disappeared.
Also I tried using the code below as suggested in the forum to scroll to my selected row.

    
            int visualRowsCount = this.radGridView1.GridElement.VisualRows.Count;   
        
            this.radGridView1.GridElement.ScrollToRow(indexToScroll - visualRowsCount + 3);

But my visualrows.count is always returned as zero. And when I call the ScrollToRow method, it always gives an outofbounds exception.
I am using the binding below where docs is a DataTable.

    
            this.gridDocs.MasterGridViewTemplate.Columns.Clear(); 
        
            this.gridDocs.MasterGridViewTemplate.DataSource = docs;

Am I doing something wrong here?

GridView

answered on 03 Jul 2009

5 answers

517 views

SelectedValueChanged Fired Twice

I'm using RadControls for WinForms 2008.3 1321 (control version 8.2.0.0) and found the following issue:

The SelectedValueChanged event of the RadComboBox fires two times when the item selection changes. I'm able to reproduce this with the following small WinForms test project:

Form1.Designer.cs

    
            namespace RadComboTest 
        
            { 
        
                partial class Form1 
        
                { 
        
                    /// <summary> 
        
                    /// Required designer variable. 
        
                    /// </summary> 
        
                    private System.ComponentModel.IContainer components = null; 
        
                    /// <summary> 
        
                    /// Clean up any resources being used. 
        
                    /// </summary> 
        
                    /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param> 
        
                    protected override void Dispose(bool disposing) 
        
                    { 
        
                        if (disposing && (components != null)) 
        
                        { 
        
                            components.Dispose(); 
        
                        } 
        
                        base.Dispose(disposing); 
        
                    } 
        
                    #region Windows Form Designer generated code 
        
                    /// <summary> 
        
                    /// Required method for Designer support - do not modify 
        
                    /// the contents of this method with the code editor. 
        
                    /// </summary> 
        
                    private void InitializeComponent() 
        
                    { 
        
                        this.radComboBox1 = new Telerik.WinControls.UI.RadComboBox(); 
        
                        ((System.ComponentModel.ISupportInitialize)(this.radComboBox1)).BeginInit(); 
        
                        this.SuspendLayout(); 
        
                        //  
        
                        // radComboBox1 
        
                        //  
        
                        this.radComboBox1.Location = new System.Drawing.Point(12, 12); 
        
                        this.radComboBox1.Name = "radComboBox1"; 
        
                        //  
        
                        //  
        
                        //  
        
                        this.radComboBox1.RootElement.AutoSizeMode = Telerik.WinControls.RadAutoSizeMode.WrapAroundChildren; 
        
                        this.radComboBox1.Size = new System.Drawing.Size(260, 20); 
        
                        this.radComboBox1.TabIndex = 0; 
        
                        this.radComboBox1.Text = "radComboBox1"; 
        
                        //  
        
                        // Form1 
        
                        //  
        
                        this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F); 
        
                        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; 
        
                        this.ClientSize = new System.Drawing.Size(284, 264); 
        
                        this.Controls.Add(this.radComboBox1); 
        
                        this.Name = "Form1"; 
        
                        this.Text = "Form1"; 
        
                        ((System.ComponentModel.ISupportInitialize)(this.radComboBox1)).EndInit(); 
        
                        this.ResumeLayout(false); 
        
                        this.PerformLayout(); 
        
                    } 
        
                    #endregion 
        
                    private Telerik.WinControls.UI.RadComboBox radComboBox1; 
        
                } 
        
            }

Form1.cs

    
            using System; 
        
            using System.Diagnostics; 
        
            using System.Windows.Forms; 
        
            using Telerik.WinControls.UI; 
        
            namespace RadComboTest 
        
            { 
        
                public partial class Form1 : Form 
        
                { 
        
                    public Form1() 
        
                    { 
        
                        InitializeComponent(); 
        
                        radComboBox1.Items.Add(new RadComboBoxItem("Item1", 1)); 
        
                        radComboBox1.Items.Add(new RadComboBoxItem("Item2", 2)); 
        
                        radComboBox1.Items.Add(new RadComboBoxItem("Item3", 3)); 
        
                        radComboBox1.SelectedValueChanged += new EventHandler(radComboBox1_SelectedValueChanged); 
        
                    } 
        
                    void radComboBox1_SelectedValueChanged(object sender, EventArgs e) 
        
                    { 
        
                        Debug.Fail("radComboBox1_SelectedValueChanged"); 
        
                    } 
        
                } 
        
            }

Can anybody confirm this issue?

Regards,
ReneMT

ComboBox and ListBox (obsolete as of Q2 2010)

answered on 02 Jul 2009

1 answer

395 views

RadTextBox.Focus()

Hello Telerik support,

I realize this was discussed on this forum back in June '07, but didn't reach a conclusion. I'm trying to simply set input focus to a radTextBox like so:

private

void Form_Load(object sender, EventArgs e)

{
this.radTextBox.Focus();

}

The cursor does not get set onto the radTextBox. What needs to be done here?

Thanks!
Jeremy

TextBox