Questions on UI for WinForms Forum

1 answer

290 views

OK, the title's a little bit of a lie.

I am unable to figure out the right combination of property values and event handlers to get a behavior I need for dragging things around in a radtreeview.

I want to allow users to drag node around in the tree (not into other controls). This would seem to be very easy by simply setting the AllowDragDrop property to true. This works great -- except that I need to implement some constraints. Specifically, each type of node knows whether a given other node can be dropped onto it.

I was unable to find any event I could effectively hook to implement this. The documentation suggests that at the end when the drop happens (DragEnding) it's possible to apply some logic to determine if the drop is valid. However this is not enough for me. I want to provide real time feedback when the user is hovering over various nodes about whether they can drop there.

So I started trying tsome things. First I tried adding some feedback in the DragOver event. But as soon as I did that, the visuals provided by the control (basically the bitmap being dragged around) moved a few pixels but then froze. I finally concluded that I was colliding with the fully automatic drag drop capabilities in the control enabled by setting AllowDragDrop.

So I turned off AllowDragDrop and initiated a DoDragDrop manually on the MouseMove event. Then I started implementing the other normal Windows events (like DragOver). In order to provide feedback, I change the colors of the potential target node. This all works well *BUT* I can't figure out how to catch when the user cancels the drag-drop so I can restore the node to its original colors. I can do this if the operation completes by changing it back in the DragDrop event, but I don't think that happens if the user hits escape while dragging.

So... I thought I could hook QueryContinueDrag because it seems to have a flag indicating whether the user pressed Escape. And here's the problem. The event never seems to be called. Is that a bug? Is there something I need to do to cause the events to be fired? My concern is that there is a bug such that QueryContinueDrag doesn't fire if the drag-drop operation is manually initiated (as I'm doing now).

Any advice? Is there a simpler way to make this work? Is there a bug with firing QueryContinueDrag?

Help!

Thanks,

David

Treeview

answered on 19 Sep 2008

3 answers

602 views

GridViewDateTimeColumn - FormatString ="dd-MM-yyyy HH:mm"

I would like my dates to be formatted like this

dd-MM-yyyy HH:mm

which should result in

10-08-2008 15:30

However viewing data is currently formatted like this

10-09-2008 15:30:00

and when editing the values it is:

17. september 2008

I would like both formats to use this format string

dd-MM-yyyy HH:mm

And as i read it i should only set the FormatString property and this should result in both the edit and view format to be set correctly.

Below i attached my code:

            puljeRounds.MasterGridViewTemplate.Columns.Add(new GridViewDateTimeColumn("Dato", "round_date") {  FormatString = "{0:dd-MM-yyyy HH:mm}" });

GridView

answered on 19 Sep 2008

3 answers

144 views

DocumentPresenterControl Theme - Selected?

This should be an easy one - how do I make it so that when I select a tab in the docking manager, the selected tab is highlighted?

I've got it highlighting the tab when I hover & when I click on the tab, but the effects are just fading away, so I need to know how to find and set the condition for the effect.

thanks

Themes and Visual Style Builder

answered on 19 Sep 2008

4 answers

449 views

Pie Chart Labels/Values

Hello,

Is it possible in pie chart show the slice name and correspondent value?

I only can show or one or other.

Thank you.
LM

Chart (obsolete as of Q1 2013)

answered on 19 Sep 2008

5 answers

126 views

[Solved] DragDrop in RadToolstrip

Hi Telerik Team,
I am looking into your new Q2 2008 pack of Rad controls for Win Forms.
I just came cross a demand from client. i.e.

We have Radtreeview in form as well. Now the user wants that if he drags any node of treeview control and drops it in toolstrip area then the node's tool button should created.
The problem I am encountering is that i could not find any event something like "Drag in" or even "Mouse Up" as i can see there is an event of "Mouse down".

Can you please help in in this regard.

Regards,
Haroon.

Toolstrip (obsolete as of Q3 2010)

answered on 18 Sep 2008

1 answer

134 views

selecting multiple lines

hi,

i want to get the values of the gridview rows columns when several rows are selected. is there an collection of selected rows and can i get the values using "for each..."?

thanks,

andreas

GridView

answered on 18 Sep 2008

1 answer

367 views

Photo Album Sample

Hi Telerik Team,
Can you please provide we a sample projects (with vb 2005) code of "Photo Album " and "Business Card" projects in your winForm Conrtols Demo project.
I be really thankful.

Regards,
Haroon.

General Discussions

answered on 18 Sep 2008

1 answer

233 views

RadGrid - Linq editing with select new { }

Hi

I have a Grid bound as below, i am able to enter edit state on the TextBoxes however upon end edit the value entered is not persisted in the grid (meaning the datasource)

Why is this ?

If it is not possible to have a "select new { }" in the linq query and still edit, how should i then do this ?

                        rounds.MasterGridViewTemplate.Columns.Clear();  
        
                        rounds.MasterGridViewTemplate.Columns.Add(new GridViewDataColumn("Hjemme", "tName") { Width = 120,ReadOnly=true });  
        
                        rounds.MasterGridViewTemplate.Columns.Add(new GridViewTextBoxColumn("Bane", "lane_HomeNum") { Width = 55, HeaderText = "Bane" });  
        
                        rounds.MasterGridViewTemplate.Columns.Add(new GridViewDataColumn("Ude", "tName2") { Width = 120, ReadOnly = true });  
        
                        rounds.MasterGridViewTemplate.Columns.Add(new GridViewTextBoxColumn("Bane Ude", "lane_awayNum") {  Width = 55, HeaderText = "Bane", DataType = typeof(int) });  
        
                        rounds.MasterGridViewTemplate.Columns.Add(new GridViewDataColumn("Anden dato", "round_id") { Width = 50, ReadOnly = true });  
        
                        rounds.MasterGridViewTemplate.AutoGenerateColumns = false;  
        
                        var q = from v in db.match_dbs  
        
                                where v.round_id == roundID  
        
                                select new { v.match_id,  tName =  v.team_db.team_name,v.lane_HomeNum,  v.lane_awayNum , tName2 = v.team_db1.team_name };  
        
                        rounds.DataSource = q;

GridView

answered on 18 Sep 2008

3 answers

127 views

RadPanelBar to ActiveX/COM?

Hi Guys,

I am looking for a way to export the RadPanelBar Control to an ActiveX object for use in a VB6 project. I know it’s possible, I just need a bit of help considering the RadPanelBar is a user control and not a simple object.

Going from ActiveX to .NET is fairly simple but it’s a bit of a pain going the other way.

Any help would be appreciated. I couldn't find much via google. :~<

Thanks,
Chris H

C# .NET 2008,
NET Framework 3.0,
Telerik Controls 2008 Q2 SP1

Panelbar (obsolete as of Q2 2010)

answered on 17 Sep 2008

1 answer

154 views

Problem when use RadComboBoxElement

Hello,

I tried to use RadComboBoxElement now but met 2 problems.

1. I did set the property "ReadOnly" to True, however, I could always edit the text shown in the combobox, same problem in the demo of RadControl.

2. When the text of an item in the combox is longer than the length of the combobox, then I selected it, in the combobox it would show the end of the item. What I want is to show the head of the text.

Waiting for ur answer.

Toolstrip (obsolete as of Q3 2010)

answered on 17 Sep 2008