Questions on UI for WPF Forum

3 answers

331 views

Barcode Reader

I've been playing with your Barcode Reader and assume I am doing something wrong or missing something.

First, is there a way to "push the Open button" from the library? When I produce a barcode image, I'd like to just have it read that when I ask in code... not from the button.

Secondly and more important, I can't get a good read. I have created a demo app that I'd be happy to share. I print a 128 barcode to PNG file. Then, I attempt to read the value back using the reader and it never returns the value I entered into the barcode.

Output Barcode to PNG File:

SaveFileDialog dialog = new SaveFileDialog()

{

DefaultExt = "png",

Filter = "png (*.png)|*.png"

};

if (dialog.ShowDialog() == true)

{

using (Stream stream = dialog.OpenFile())

{

Telerik.Windows.Media.Imaging.ExportExtensions.ExportToImage(

barCode,

stream,

new PngBitmapEncoder());

}

Let me know if you want me to upload my demo app.
Joel

BarCode

answered on 12 Nov 2015

2 answers

125 views

Incorrect editors when switching PropertySetMode

I'm experiencing some odd behavior when changing the PropertySetMode at runtime.

I have two object types: MyTestClass1 and MyTestClass2. MyTestClass1 has a writeable property IntProp and MyTestClass2 has a readonly property IntProp. If I start in Intersection mode with Item = List<Object> { myTestClass1Obj1, myTestClass1Obj2 } everything works properly. If I then change to PropertySetMode None with Item = myTestClass2Obj, the editor for IntProp will be writeable even though IntProp on myTestClass2Obj has no public setter.

See runnable test case below. I am running 2015.2.728

<Window x:Class="WpfApplication1.MainWindow"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"

Title="MainWindow" Height="350" Width="525">

<Grid>

<StackPanel Orientation="Vertical">

<Button Click="ButtonBase_OnClick">Change to mode none</Button>

<telerik:RadPropertyGrid x:Name="rpg"/>

</StackPanel>

</Grid>

</Window>

using System;

using System.Collections.Generic;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.ComponentModel;

using System.Collections.ObjectModel;

using System.Text.RegularExpressions;

using System.ComponentModel.DataAnnotations;

using Telerik.Windows.Controls.Data.PropertyGrid;

namespace WpfApplication1

{

/// <summary>

/// Interaction logic for MainWindow.xaml

/// </summary>

public partial class MainWindow : Window

{

private readonly MyTestClass test;

private readonly MyTestClass test2;

private readonly MyTestClass2 test3;

public MainWindow()

{

InitializeComponent();

rpg.AutoGeneratingPropertyDefinition += new

EventHandler<Telerik.Windows.Controls.Data.PropertyGrid.AutoGeneratingPropertyDefinitionEventArgs>(rpg_AutoGeneratingPropertyDefinition);

// test data. IntProp is has a public setter

test = new MyTestClass() { StringProp = "91das", RequiredField = "abc", IntProp = 10, DateTimeProp = new DateTime(1920, 2, 21) };

test2 = new MyTestClass() { StringProp = "91das", RequiredField = "abc", IntProp = 10, DateTimeProp = new DateTime(1920, 2, 21) };

// test data. IntProp is read only (no public setter)

test3 = new MyTestClass2() { StringProp = "91das", RequiredField = "abc", DateTimeProp = new DateTime(1920, 2, 21) };

rpg.Item = new List<Object> {test, test2};

rpg.PropertySetMode = PropertySetOperation.Intersection;

}

void rpg_AutoGeneratingPropertyDefinition(object sender, Telerik.Windows.Controls.Data.PropertyGrid.AutoGeneratingPropertyDefinitionEventArgs e)

{

(e.PropertyDefinition.Binding as Binding).ValidatesOnDataErrors = true;

(e.PropertyDefinition.Binding as Binding).NotifyOnValidationError = true;

(e.PropertyDefinition.Binding as Binding).ValidatesOnExceptions = true;

}

private ObservableCollection<ValidationError> results;

public ObservableCollection<ValidationError> Results

{

get

{

if (this.results == null)

{

this.results = new ObservableCollection<ValidationError>();

}

return results;

}

private void ButtonBase_OnClick(object sender, RoutedEventArgs e)

{

rpg.PropertySetMode = PropertySetOperation.None;

rpg.Item = test3;

// the property grid will now allow setting of test3.IntProp even though there is

// no public setter

}

public class MyTestClass : IDataErrorInfo, INotifyPropertyChanged

{

private int intVar;

private string requiredField;

public int IntProp

{

get { return intVar; }

set

{

intVar = value;

this.OnPropertyChanged("IntProp");

}

[Required(ErrorMessage = "This field is Required.")]

public string RequiredField

{

get { return requiredField; }

set

{

requiredField = value;

ValidateProperty("RequiredField", value);

this.OnPropertyChanged("RequiredField");

}

private string stringVar;

public string StringProp

{

get { return stringVar; }

set

{

stringVar = value;

this.OnPropertyChanged("StringProp");

}

private DateTime dateTimeVar;

public DateTime DateTimeProp

{

get { return dateTimeVar; }

set

{

dateTimeVar = value;

this.OnPropertyChanged("DateTimeProp");

}

[Browsable(false)]

public string Error

{

get { return string.Empty; }

}

public string this[string columnName]

{

get

{

if (columnName == "IntProp")

{

return this.IntProp < 100 && this.IntProp > 0 ? string.Empty : "Value should be in the range of (0, 100)";

}

if (columnName == "StringProp")

{

return this.StringProp != null && Regex.IsMatch(this.StringProp, @"^[0-9]+[\p{L}]*") ? string.Empty : @"Value should math the regex: ^[0-9]+[\p{L}]*";

}

if (columnName == "DateTimeProp")

{

return this.DateTimeProp.Year > 1900 ? string.Empty : "Date should be after 1/1/1900";

}

return string.Empty;

}

protected void OnPropertyChanged(string name)

{

if (this.PropertyChanged != null)

{

this.PropertyChanged(this, new PropertyChangedEventArgs(name));

}

public event PropertyChangedEventHandler PropertyChanged;

public void ValidateProperty(string propName, object value)

{

var result = new List<System.ComponentModel.DataAnnotations.ValidationResult>();

Validator.TryValidateProperty(value, new ValidationContext(this, null, null) { MemberName = propName }, result);

if (result.Count > 0)

{

throw new ValidationException(result[0].ErrorMessage);

}

public class MyTestClass2 : IDataErrorInfo, INotifyPropertyChanged

{

private int intVar;

private string requiredField;

public int IntProp { get; } = 12;

[Required(ErrorMessage = "This field is Required.")]

public string RequiredField

{

get { return requiredField; }

set

{

requiredField = value;

ValidateProperty("RequiredField", value);

this.OnPropertyChanged("RequiredField");

}

private string stringVar;

public string StringProp

{

get { return stringVar; }

set

{

stringVar = value;

this.OnPropertyChanged("StringProp");

}

private DateTime dateTimeVar;

public DateTime DateTimeProp

{

get { return dateTimeVar; }

set

{

dateTimeVar = value;

this.OnPropertyChanged("DateTimeProp");

}

[Browsable(false)]

public string Error

{

get { return string.Empty; }

}

public string this[string columnName]

{

get

{

if (columnName == "IntProp")

{

return this.IntProp < 100 && this.IntProp > 0 ? string.Empty : "Value should be in the range of (0, 100)";

}

if (columnName == "StringProp")

{

return this.StringProp != null && Regex.IsMatch(this.StringProp, @"^[0-9]+[\p{L}]*") ? string.Empty : @"Value should math the regex: ^[0-9]+[\p{L}]*";

}

if (columnName == "DateTimeProp")

{

return this.DateTimeProp.Year > 1900 ? string.Empty : "Date should be after 1/1/1900";

}

return string.Empty;

}

protected void OnPropertyChanged(string name)

{

if (this.PropertyChanged != null)

{

this.PropertyChanged(this, new PropertyChangedEventArgs(name));

}

public event PropertyChangedEventHandler PropertyChanged;

public void ValidateProperty(string propName, object value)

{

var result = new List<System.ComponentModel.DataAnnotations.ValidationResult>();

Validator.TryValidateProperty(value, new ValidationContext(this, null, null) { MemberName = propName }, result);

if (result.Count > 0)

{

throw new ValidationException(result[0].ErrorMessage);

}

dafadsf

PropertyGrid

answered on 12 Nov 2015

4 answers

203 views

Binding errors on item changing

With xaml
<Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="321*" />
            <ColumnDefinition Width="335*" />
        </Grid.ColumnDefinitions>
        <StackPanel>
            <Button Margin="5" GotFocus="GotFocus">Test</Button>
            <TextBox Margin="5" GotFocus="GotFocus">text</TextBox>
        </StackPanel>
        <telerik:RadPropertyGrid x:Name="pg" Grid.Column="1"
                                 LabelColumnWidth="100" IsGrouped="True" AutoGeneratePropertyDefinitions="True"
                                 telerik:StyleManager.Theme="Vista"/>
    </Grid>
and code

        private void GotFocus(object sender, RoutedEventArgs e)
        {
            pg.Item = sender;
        }
if you switch between controls than you see errors like this
System.Windows.Data Error: 40 : BindingExpression path error: 'ClickMode' property not found on 'object' ''TextBox' (Name='')'. BindingExpression:Path=ClickMode; DataItem='TextBox' (Name=''); target element is 'RadComboBox' (Name=''); target property is 'SelectedValue' (type 'Object')
System.Windows.Data Error: 40 : BindingExpression path error: 'Command' property not found on 'object' ''TextBox' (Name='')'. BindingExpression:Path=Command; DataItem='TextBox' (Name=''); target element is 'TextBox' (Name=''); target property is 'Text' (type 'String')
System.Windows.Data Error: 40 : BindingExpression path error: 'CommandParameter' property not found on 'object' ''TextBox' (Name='')'. BindingExpression:Path=CommandParameter; DataItem='TextBox' (Name=''); target element is 'TextBox' (Name=''); target property is 'Text' (type 'String')
System.Windows.Data Error: 40 : BindingExpression path error: 'CommandTarget' property not found on 'object' ''TextBox' (Name='')'. BindingExpression:Path=CommandTarget; DataItem='TextBox' (Name=''); target element is 'TextBox' (Name=''); target property is 'Text' (type 'String')
Because the propertygrid do not clear bindings after change selected item.
The version is 2011.3.1330.40 Dev

PropertyGrid

answered on 12 Nov 2015

4 answers

97 views

Constraining scope of context menu

When I right-click outside the area containing the slots,for example, on the header, the context menu that I have defined still appears provided that I have a selected slot or appointment. Is it possible to constrain the context menu to the slot area?

ScheduleView

answered on 12 Nov 2015

5 answers

173 views

Invalid value for property error using RadWizardCommands

I'm using the commands in the RadWizardCommands class as described Commands page of the documentation for the RadWizard. I'll start by noting that everything works in the application at runtime; however, at design-time Visual Studio 2015 reports the use of the commands as errors. I'd love to eliminate this noise, because it's easy for it to obfuscate real problems.

<telerik:RadButton Content="< Back" Command="wizard:RadWizardCommands.MoveCurrentToPrevious" .. />

The errors that are reported are: Invalid value for property 'Command': 'Microsoft.VisualStudio.DesignTools.XamlLanguageService.Semantics.XmlValue'

Wizard

answered on 12 Nov 2015

1 answer

145 views

IsSnapToTick + Incerease/Decrease Handles

Clicking on the Decrease/Increase Handles of a RadSlider normally changes the Slider by the amount of SmallChange.

But what if I have IsSnapToTickEnabled=True and ticks are not equidistant? In this case the buttons don't work properly. For example:

<telerik:RadSlider

Minimum="0" Maximum="10"

IsSnapToTickEnabled="True"

SmallChange="2"

Ticks="2,4,8,13" />

leads to the problem that Increase Handle works well when navigating from tick 2 to 4, but then nothing more happens and no further click will bring the thump to tick 8 and 13. This is an incorrect behaviour, or am I wrong?

Peter, Germany

Slider

answered on 12 Nov 2015

6 answers

728 views

Column and Row merging

Hi,
I have a question about how to implement scenario presented on the picture table.png? There are 2 separate problems. First and more important is how to implement cell spanning in RadGridView? I had some luck with Custom row layout combined with Style selector and DataTriggers. Then for some rows I managed to change layout do display only cell with TextBlock like in the Row 3 on the picture. Is this the right approach? Well, it works then I lose all the standard styling and behavior (like highlight and so on). Is there any possibility to maintain standard row look and span cells?

The second problems is with headers. As you can see the table has some multilevel headers. I was able to create some sort of substitution of the presented header with Column Groups, but it's not the same, eg. Header 6 should span 2. The main struggle is that content cells are connected directly to Headers in second row, 3rd row of headers is only for labeling and is not connected to the table content?

GridView

answered on 12 Nov 2015

2 answers

102 views

SpreadSheet custom function execute 3 times

Hi,I am developing with RadSpreadsheet control.I register my custom function to the RadSpreadsheet .When the function evaluates ,I found that each time the EvaluateOverride method execute 3 times.Is there anything wrong here,or it's supposed to do this.I just worry about running efficiency.

Spreadsheet

answered on 12 Nov 2015

4 answers

713 views

RadGridView CollectionChanged Event

Hi,

Our code is using WPF with MVVM pattern. We are using the RadGridView to display the users data in rows with check box option to select/deselect all rows.

In my code I have a class which derives from

Behavior<RadGridView>

and inside I have

target.AssociatedObject.SelectedItems.CollectionChanged += target.GridSelectedItems_CollectionChanged;

where target is Behavior<RadGridView>

My WPF code related to grid is:

<telerik:RadGridView x:Name="Users" HorizontalAlignment="Stretch" AutoGenerateColumns="False" ShowColumnFooters="True" SelectionMode="Extended"><telerik:RadGridView x:Name="Users"Stretch" AutoGenerateColumns="False" ShowColumnFooters="True" SelectionMode="Extended">

Issue:

When I select all using the top most checkbox in the grid - the event

GridSelectedItems_CollectionChanged

fires for every item getting selected. So, if grid have 5 users in the grid - the event fires 5 times for selection/deselection of contacts.

I think collection changed method should fire only one time.

Any clarification on this would be appreciated.

Thanks,

Nirav Patel

GridView

answered on 11 Nov 2015

1 answer

125 views

RadFluidContentControl - Databinding from Viewmodel

Hi,

I'm using RadTileView and RadFluidContentControl to display small, normal and large views. For some reason the default normal view is displaying correctly but other 2 views are not displayed. Please see below code:

<telerik:RadTileViewItem Header="Test">

<telerik:RadFluidContentControl ContentChangeMode="Manual"
State="{Binding RelativeSource={RelativeSource AncestorType=telerik:RadTileViewItem}, Path=TileState, Converter={StaticResource FluidContentStateConverter}}">

    <telerik:RadFluidContentControl.SmallContent>

   <TextBlock Text="{Binding Path=textvalue}" />
</telerik:RadFluidContentControl.SmallContent>

<telerik:RadFluidContentControl.Content>

<TextBlock Text="{Binding Path=textvalue1}" />
</telerik:RadFluidContentControl.Content>

   <telerik:RadFluidContentControl.LargeContent>

<TextBlock Text="{Binding Path=textvalue2}" />

</telerik:RadFluidContentControl.LargeContent>

</telerik:RadFluidContentControl>

</telerik:RadTileViewItem>