Questions on UI for WPF Forum

1 answer

55 views

Chart needs ItemWidthPercent set before draw?

ChartArea.ItemWidthPercent is a DependencyProperty within a RadChart, but setting it after a chart is drawn has no visible effect, only if it is set to the desired value before the RadChart is drawn. I've tried setting it in bindings, as well as setting it manually with code-behind driven by WPF events to no avail. Is this intended behavior? Am I missing something that must be done (will post code if needed)? Or is it simply that once the chart has been rendered, it must be re-rendered to take into effect some changes?

Chart

answered on 05 Jul 2010

1 answer

73 views

Selecting Bars

Hi,

I have a radchart with a Canvas overlay. In the canvas I allow my users to create a rectangle to enclose the bars/data points that he may be interested. The Canvas is 1:1 size with the radChart.

Now based on the rectangle coordinates... How do I find which bars the user selected on the bars underneath my layer? Is there a way I can pass screen/canvas coordinates to the radchart and get back a collection with the items inside the range?

Something like:

selectedCollection = radChart.getItems(Point p1, Point p2);

J

Chart

answered on 05 Jul 2010

2 answers

1.2K+ views

ItemsSource Binding to a Single Object

Hi, hopefully this will be a simple question with a quick answer.

My logical data structure is a List (eg. List<TopList>) with each item in the first list also having it's own list (eg. TopList[0].MiddleList). Finally, each MiddleList has some other class (eg. TopList[0].MiddleList[0].BottomClass), and I want to display all three in the UI with a RadTreeView for expanding and drag and drop support.

My xaml is set up as:

    
                    <HierarchicalDataTemplate x:Key="GroupListNestedContentTemplate"> 
        
                        <bui:UserControlForBottomClass/> 
        
                    </HierarchicalDataTemplate> 
        
                    <HierarchicalDataTemplate x:Key="GroupListNestedTemplate" ItemsSource="{Binding BottomClass}" ItemTemplate="{StaticResource GroupListNestedContentTemplate}"> 
        
                        <bui:UserControlForMiddleLevel /> 
        
                    </HierarchicalDataTemplate> 
        
                    <HierarchicalDataTemplate x:Key="GroupListTemplate" ItemsSource="{Binding MiddleList}" ItemTemplate="{StaticResource GroupListNestedTemplate}"> 
        
                        <bui:UserControlForTopLevel/> 
        
                    </HierarchicalDataTemplate> 
        
            <Controls:RadTreeView x:Name="UiElement" DataContext="{Binding}" ItemsSource="{Binding}" ItemTemplate="{StaticResource GroupListTemplate}" IsDragDropEnabled="True" IsSingleExpandPath="True" IsExpandOnSingleClickEnabled="True" />

With codebehind setting UiElement.DataContext = TopList.

The problem is that (from all the examples I've seen) the RadTree requires my BottomClass to be in a List. Changing my BottomClass into a List will render and databind correctly. Ideally though, I don't want to do this to my logic and create a List with only one item. My question is basically: Is there a way to DataBind and display my BottomClass without putting it into a List and without using a for loop in the code behind?

As a side note I've considered turning my UI structure into a RadTree with Expanders as the contents, but this ran into display and usability issues when collapsing the expander vs closing the tree nodes.

TreeView

answered on 05 Jul 2010

1 answer

94 views

Rows Numbers

Hi

Is there property for the rows number (IsRowsNumbersEnable) or I need to build it myself like in the Sample?

Best regards

Ehud

GridView

answered on 04 Jul 2010

0 answers

94 views

Bring SelectedDate into view

Hello,

I have a RadCalendar and I'm binding the SelectedDate property. It's working fine - the source and the target get updated as normal. However, I want to bring the selected date into view when it doesn't belong to the month being displayed.

Edit: I solved my problem using DisplayDate.

Calendar

asked on 02 Jul 2010

1 answer

351 views

Add/Remove Row

Hi,

how can i remove selected row and how can i add new one to the top? Im writing simple email app, and i need to add new rows to the top when messages come, and remove selected row (because someone can delete it, or move to another folder). I know there is an event Deleted and Deleting, but that is not what i need.

GridView

answered on 02 Jul 2010

2 answers

162 views

Self referencing hierarchy RowLoaded event on Child Table Definitions

I've been working on an application using a multi-level self-referencing heirarchy, and have come across a problem with using the RowLoaded event for any level other than the first level. Hopefully someone can give me a pointer on how to get this working.

My basic goal at the moment is to disable the expand button (+) next to items that do not have a heirarchy beneath them, I've recreated the sample from here in WPF, as a simple baseline. I've added a little to this to try to make it work as I need (including only having heirarchies related to some items), So I'll post my version of the code below. As I mentioned, I'm using the RowLoaded event to decide whether or not to make the row expandable, but this only works for the first level.

Is there a way I can use this RowLoaded event (or another one) to do the same for levels 2 - 10 (or however deep it goes)?

Thanks,
Russell

The MainWindow.xaml:

    
            <Window x:Class="HeirarchicalGridExample.MainWindow" 
        
                    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
        
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
        
                    xmlns:telerikGrid="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.GridView" 
        
                    xmlns:telerikData="clr-namespace:Telerik.Windows.Data;assembly=Telerik.Windows.Data" 
        
                    Title="MainWindow" Height="350" Width="525">  
        
                <Grid> 
        
                    <telerikGrid:RadGridView x:Name="RadGridView1" ItemsSource="{Binding}" DataLoading="RadGridView1_DataLoading" RowLoaded="RadGridView1_RowLoaded" /> 
        
                </Grid> 
        
            </Window>

The MainWindow.xaml.cs:

    
            using System;  
        
            using System.Collections.Generic;  
        
            using System;  
        
            using System.Collections.Generic;  
        
            using System.Linq;  
        
            using System.Windows;  
        
            using System.Windows.Data;  
        
            using Telerik.Windows.Controls.GridView;  
        
            using Telerik.Windows.Controls;  
        
            using Telerik.Windows.Data;  
        
            namespace HeirarchicalGridExample  
        
            {  
        
                /// <summary> 
        
                /// Interaction logic for MainWindow.xaml  
        
                /// </summary> 
        
                public partial class MainWindow : Window  
        
                {  
        
                    public MainWindow()  
        
                    {  
        
                        InitializeComponent();  
        
                        DataContext = from i in Enumerable.Range(0, 5)  
        
                                      select new MyObject()  
        
                                      {  
        
                                          ID = i,  
        
                                          Name = String.Format("Name{0}", i),  
        
                                          Level = 1 
        
                                      };  
        
                    }  
        
                    public class MyObject  
        
                    {  
        
                        public int ID { get; set; }  
        
                        public string Name { get; set; }  
        
                        public int Level { get; set; }  
        
                        public IEnumerable<MyObject> Items  
        
                        {  
        
                            get  
        
                            {  
        
                                if (ID == 1 || ID == 3 || ID == 5 || ID == 7)  
        
                                {  
        
                                    return from i in Enumerable.Range(0, 10)  
        
                                           select new MyObject()  
        
                                           {  
        
                                               ID = i,  
        
                                               Name = String.Format("{0}", Name + " - " + i.ToString()),  
        
                                               Level = Level + 1  
        
                                           };  
        
                                }  
        
                                else  
        
                                    return Enumerable.Empty<MyObject>();  
        
                            }  
        
                        }  
        
                    }  
        
                    private void RadGridView1_DataLoading(object sender, Telerik.Windows.Controls.GridView.GridViewDataLoadingEventArgs e)  
        
                    {  
        
                        var grid = (GridViewDataControl)sender;  
        
                        var d = new GridViewTableDefinition();  
        
                        d.Relation = new PropertyRelation("Items");  
        
                        grid.TableDefinition.ChildTableDefinitions.Add(d);  
        
                        grid.AutoGenerateColumns = false;  
        
                        grid.Columns.Add(new GridViewDataColumn() { DataMemberBinding = new Binding("Level") });  
        
                        grid.Columns.Add(new GridViewDataColumn() { DataMemberBinding = new Binding("ID") });  
        
                        grid.Columns.Add(new GridViewDataColumn() { DataMemberBinding = new Binding("Name") });  
        
                    }  
        
                    // this is only working for the top level of the grid  
        
                    private void RadGridView1_RowLoaded(object sender, RowLoadedEventArgs e)  
        
                    {  
        
                        GridViewRow row = e.Row as GridViewRow;  
        
                        MyObject rowItem = e.DataElement as MyObject;  
        
                        if (row != null && rowItem != null)  
        
                        {  
        
                            if (rowItem.Items.Count<MyObject>() > 0)  
        
                                row.IsExpandable = true;  
        
                            else  
        
                                row.IsExpandable = false;  
        
                        }  
        
                    }  
        
                }  
        
            }

GridView

answered on 02 Jul 2010

3 answers

174 views

DotNet 4.0 Client Profile

Does Telerik intend to make RadControls for WPF complient with the DotNet 4.0 Client Profile? Based on what is said:

http://blogs.msdn.com/jgoldb/archive/2009/10/19/what-s-new-in-net-framework-4-client-profile-beta-2.aspx

"Since we are considering to make the NET4 Client Profile available broadly to desktops via Windows Update, most client desktops may have NET4 Client Profile soon after NET4 releases making it ubiquitous."

It would be great we could build WPF apps with RadControls and know that many of our customers may already have the current framework. (I'm not so concerned about 3.5 Client Profile, btw, skipping right over that).

General Discussions

answered on 02 Jul 2010

1 answer

83 views

Update TreeView with entirely new content

I just wanted to know what is the best way to update the TreeView with entirely new content. i.e. Refresh the list completely.

TreeView

answered on 02 Jul 2010

1 answer

118 views

Select month not date

I want my users to select a month using the RadDatePicker. The default behavior is that the user selects a date. Can I change that somehow?

An idea I had was to catch the DisplayModeChange-event and check if it was changing from YearView to MonthView. When that happens I now that the user has clicked on a month. But I can't find any way to find out which month was clicked, since nothing has really been selected yet (only dates can be selected).

Is there a solution to this problem?

A clarification: When I say I want the users to select a month, I don´t mean just "February" but "February 2010" (a specific month in a specific year).

DatePicker

answered on 02 Jul 2010