Questions on UI for WPF Forum

9 answers

368 views

How to get position of last element in RadDocument in pixels?

Hi I need to scale an image so that it fills all the empty space in a page. For this I am trying to find the remaining height of the page after some elements are inserted in it. I am using the following code:

var position = new DocumentPosition(section.GetRootDocument());

position.MoveToDocumentEnd();

var pageContentHeight = section.PageSize.Height - position.Location.Y - section.PageMargin.Vertical;

The problem is that position.Location.Y does't return a value in pixels. For example when my page is filed with text it returns 173.8107 but the height of the page is 1056.

How to get position of last element in RadDocument in pixels?

RichTextBox

answered on 29 Apr 2020

2 answers

184 views

RadCartesianChart ConvertDataToPoint returns incorrect results after axis max/min change

I have a CartesianCustomAnnotation on my chart that draws an ellipse. The ellipse must cover the same amount of chart coordinates (millimeters) in X and Y. Since ellipse height and width are pixels, I had to bind them with a MultiConverter that uses the chart's ConvertDataToPoint function to convert to pixels It generally works well.

But if I change Vertical/Horizontal axes Minimum/Maximum values in code-behind (to achieve Equal-Scale effect I asked you about), even though my binding gets invoked and calls ConvertDataToPoint agin, the pixel values returned do NOT reflect the chart new layout. I'll get values representing the old axis min/max values and they'll look terrible with the new scaling

But then, if I do anything at all to force another update of the binding, suddenly, the values returned will look great again. Even if the change does not alter the underlying values in any meaningful way.

It's almost as the chart's layout code needs for a UI update happen on the control before ConvertDataToPoint will start returning numbers appropriate to the new axes min/max values.

Is there any truth to do this? If I change an axis max/min, do I need to do something (force some layout/update or something) before calling ConvertDataToPoint? Or is there some chart/axis property I should be binding to instead of what I'm using (see below)

Note that I've dumped the numbers going into and out of the converter. They're identical inputs, but completely different outputs from ConvertDataToPoint from when I first change the properties vs when I force a manual update.

Here is the converter

public class ChartDataToPixelsConverter : IMultiValueConverter

{

public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)

{

if (values == null || values.Length < 2)

return DependencyProperty.UnsetValue;

if (!(values[0] is RadCartesianChart chart)) // Must have a chart

return DependencyProperty.UnsetValue;

if (!(values[1] is double length)) // Must have a diameter value in mm

return DependencyProperty.UnsetValue;

if (!(values[2] is PointElement element)) // Are we returning X pixels or Y pixels?

element = PointElement.X;

if (element == PointElement.Y)

{

var p1 = chart.ConvertDataToPoint(new DataTuple(0, length));

var p2 = chart.ConvertDataToPoint(new DataTuple(0, 0));

var result = Math.Abs(p1.Y - p2.Y);

Debug.WriteLine($"length {length.MM} => yHeight {result}");

return result;

}

else

{

var p1 = chart.ConvertDataToPoint(new DataTuple(length, 0));

var p2 = chart.ConvertDataToPoint(new DataTuple(0, 0));

var result = Math.Abs(p1.X - p2.X);

Debug.WriteLine($"length {length.MM} => xWidth {result}");

return result;

}

public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)

{

return Enumerable.Repeat(Binding.DoNothing, targetTypes?.Length ?? 0).ToArray();

}

Here is the the ContentTemplate where bind the ellipse height and width as I describe. I've only shown the relevant part of the annotation style

<Style x:Key="ProfileCircleStyle"TargetType="{x:Type tk:CartesianCustomAnnotation}">

<Setter Property="ContentTemplate">

<Setter.Value>

<DataTemplate DataType="{x:Type tk:CartesianCustomAnnotation}">

<Ellipse Fill="GreenYellow" d:DataContext="{d:DesignInstance {x:Type gci:IProfileOutputCircle}}">

<Ellipse.Width>

<!-- Converter only uses first 3 Binding elements. Others are supplied merely

to trigger re-evaluation when the related properties change. X-axis minimum is always zero -->

<MultiBinding Converter="{StaticResource CvtDataToPixels}" Mode="OneWay">

<Binding ElementName="MyChart"/> 

<Binding Path="Diameter" /> 

<Binding Source="{x:Static gcenum:PointElement.X}"/> 

<Binding RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type tk:RadCartesianChart}}" Path="Zoom"/>

<Binding RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type tk:RadCartesianChart}}" Path="HorizontalAxis.(tk:LinearAxis.Maximum)"/>

</MultiBinding>

</Ellipse.Width>

<Ellipse.Height>

<!-- Converter only uses first 3 Binding elements. Last two are supplied merely

to trigger re-evaluation when the related properties change -->

<MultiBinding Converter="{StaticResource CvtDataToPixels}" Mode="OneWay">

<Binding ElementName="MyChart"/>

<Binding Path="Diameter" />

<Binding Source="{x:Static gcenum:PointElement.Y}"/>

<Binding RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type tk:RadCartesianChart}}" Path="Zoom"/>

<Binding RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type tk:RadCartesianChart}}" Path="VerticalAxis.(tk:LinearAxis.Minimum)"/>

<Binding RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type tk:RadCartesianChart}}" Path="VerticalAxis.(tk:LinearAxis.Maximum)"/>

</MultiBinding>

</Ellipse.Height>

</Ellipse>

</DataTemplate>

</Setter.Value>

</Setter>

</Style>

I've attached 3 images to show you what I see.

1. The first attachment ("Correct-Normal-Scale.png") shows the chart as initially loaded. The Ellipse is skewed horizontally because the chart axes are not equal scale. But I'm using one size for both X and Y

Here is what my converter dumps for this. The ellipse is correctly much wider than tall

length 2.18513189968 => xWidth 516.7183886108953
length 2.18513189968 => yHeight 48.07290179295998

2. The second attachment ("Incorrect-Equal-Scale.png") shows how it looks right after I check my "Equal Scale" checkbox at the bottom. This causes me to manually set the axes min/max values (notice how they've changed). Even though the X axis has changed dramatically, the ellipse remains skewed horizontally. It should be a circle.

Here is what my converter dumps for this change. Note that X hasn't changed much. Y has not changed at all

length 2.18513189968 => xWidth 503.74066305424367
length 2.18513189968 => yHeight 48.07290179295998

3. Finally, I manually move the blue region just a tiny bit. This causes the binding to be reevaluated. The 3rd Attachment ("Correct-Equal-Scale.png") shows how it looks right after. Notice how the ellipse is now a perfect circle as it should have been.

Here is what my converter dumps. Notice how almost exactly the same input length value now produces identical width and height pixel values.

length 2.184046088752083 => xWidth 61.02891091119042
length 2.184046088752083 => yHeight 61.15329048505832

ChartView

answered on 28 Apr 2020

2 answers

240 views

Scale font with grid width

What I'd like to do is to be able to set it so the amount of text displayed in the columns is fixed and when the grid is resized the size of the font changes to keep the text displayed in each row fixed while having the number of rows shown vary as needed.

Using your Binding to 1 Million records Sample to show what I want, I took a screenshot stretched the grid by 50% in height and width to simulate text enlarging
as the window was widened, and then cropped out 5.5 of the 17 rows of data so that the number of rows visible was reduced because the height wasn't changed.

https://i.imgur.com/sctAk9F.png

GridView

answered on 28 Apr 2020

2 answers

95 views

Style interferes with drop down event

I am doing something very simple. I am trying to apply a simple style to a DateTimePicker. Basically, if I use the line

CalendarStyle="{StaticResource calendarStyle}", the drop down calendar doesn't show up. If I remove the line, the calendar works as expected. I'm using runtime version v4.0.30319, description is Progress® Telerik® UI for WPF. Here is the xaml:

DatePicker

answered on 27 Apr 2020

4 answers

272 views

Wizard validation VM

Hi, I'm a new developer in WPF.

I'm looking a way to validate a page of Wizard control when the "next" button is clicked.
Basically I have a wizard where the first step check a connection with a SQL Database. This check is made from ViewModel. I need that when the Next is pressed the ViewModel do the check and if return "true" the wizard go to next step.

How I can do this?

I know how to call a command of ViewModel from Wizard but how I can tell "go ahead"?

Thanks.

Wizard

answered on 27 Apr 2020

1 answer

91 views

Is merge for different orientation supported?

Hi,

I'm develpoing a WPF application using GridView. In my scenario, some cells need to be merged Vertically, some cells while, need to be merged Horizontally. But the MergedCellsDirection property can not be set to two orientations at one time. Is any suggestions or mechanism for this problem?

best regards

Yi

GridView

answered on 27 Apr 2020

2 answers

243 views

RadTaskBoard.DragDropBehavior

I'm trying to implement the custom Drag Drop behavior depicted at this link: https://docs.telerik.com/devtools/wpf/controls/radtaskboard/features/taskboardcolumndragdropbehavior#taskboardcolumndragdropbehavior

However I cannot get the XAML to recognize this item

<telerik:RadTaskBoard.DragDropBehavior>

The error message is 'The member "DragDropBehavior" is not recognized or is not accessible.

Regards,

TaskBoard

answered on 24 Apr 2020

2 answers

318 views

How to make the Rad NavigationView control translucent

How to make the Rad NavigationView control translucent, as shown in the WPF demo app, any idea?

Thank you for your attention

NavigationView (Hamburger Menu)

answered on 24 Apr 2020

2 answers

163 views

TaskBoardCardModel.State Property Change

Hi,

I'm working on an application that uses the TaskBoard and have encountered an issue when updating the State property of the TaskBoardCardModel. When the State is updated via binding should the card not move to the appropriate column?

To reproduce the issue I've provided the XAML and view model code for your review.

<Window

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"

xmlns:local="clr-namespace:TaskBoardIssue" x:Class="TaskBoardIssue.MainWindow"

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

WindowState="Maximized"

>

<Window.DataContext>

<local:TaskBoardVM/>

</Window.DataContext>

<Grid>

<Grid.ColumnDefinitions>

<ColumnDefinition Width="5*"/>

<ColumnDefinition Width="Auto"/>

</Grid.ColumnDefinitions>

<StackPanel Grid.Column="1"

Orientation="Vertical">

<Button Content="Add New Model"

Margin="3"

Command="{Binding AddModel}"

/>

<Button Content="Update State"

Margin="3"

Command="{Binding UpdateModel}"

/>

<telerik:RadPropertyGrid

Item="{Binding TestModel}"

/>

</StackPanel>

<telerik:RadTaskBoard

ItemsSource="{Binding MyTasks}"

GroupMemberPath="State"

AutoGenerateColumns="True"

/>

</Grid>

</Window>

using System;

using System.Collections.Generic;

using System.Collections.ObjectModel;

using System.ComponentModel;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Input;

using Telerik.Windows.Controls;

using Telerik.Windows.Controls.TaskBoard;

namespace TaskBoardIssue

{

public class TaskBoardVM : INotifyPropertyChanged

{

public event PropertyChangedEventHandler PropertyChanged;

ObservableCollection<TaskBoardCardModel> myTasks;

public ObservableCollection<TaskBoardCardModel> MyTasks { get; set; }

private TaskBoardCardModel testModel;

public TaskBoardCardModel TestModel

{

get { return testModel; }

set

{

if (testModel != null)

if (testModel.Equals(value))

return;

testModel = value;

this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(TestModel)));

}

public TaskBoardVM()

{

TestModel = new TaskBoardCardModel() { Assignee = "Alpha", Title = "Title Text", Description = "Description Text", State = "Backlog"};

MyTasks = new ObservableCollection<TaskBoardCardModel>()

{

new TaskBoardCardModel(){ Assignee = "Alpha", Title = "Title Text", Description = "Description Text", State = "Backlog"},

new TaskBoardCardModel(){ Assignee = "Alpha", Title = "Title Text", Description = "Description Text", State = "Active"},

new TaskBoardCardModel(){ Assignee = "Alpha", Title = "Title Text", Description = "Description Text", State = "Complete"},

};

AddModel = new DelegateCommand(InsertTestModel, canBeExecuted);

UpdateModel = new DelegateCommand(UpdateTestModel, canBeExecuted);

this.CanExecuteCommand = true;

}

public bool CanExecuteCommand { get; set; }

public ICommand AddModel { get; set; }

public ICommand UpdateModel { get; set; }

private bool canBeExecuted(object obj)

{

return this.CanExecuteCommand;

}

private void InsertTestModel(object obj)

{

MyTasks.Add(TestModel);

this.PropertyChanged(this, new PropertyChangedEventArgs(nameof(MyTasks)));

}

private void UpdateTestModel(object arg)

{

TestModel.State = "Active";

}

If you build and run the application, click the 'Add New Model' and you can see the model being added to the appropriate column. However when you click 'Update Model' you can see the State property does update (see Property Grid), but the Task Card does not move to the correct column.

Regards,

TaskBoard