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Year Selection

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DatePicker
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Gabe
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Gabe asked on 18 Apr 2011, 05:59 PM
How do I set the RadDatePicker to have selection buttons that increment and decrement the year like the month selection buttons?
So I would like to single select a data, but be able to switch the year, data and month quickly.
How do I get this view ??

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Konstantina
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answered on 19 Apr 2011, 02:34 PM
Hi Gabe,

In order to add new buttons to the Calendar, you will have edit its style. Just drop a DatePicker control into the Expression Blend design surface, right-click it and choose from the menu Edit Template->Edit a Copy. Blend will generate all the needed resources. Find the RepeatButton with x:Name="MoveLeft" - this is the place where you can put your new buttons, which will switch the year. Then, you can create a Command which will increment/decrement the year, according to the current selected date (DisplayDate) and assign it to the newly added buttons.

Hope this information helps.

Best wishes,
Konstantina
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Marshall
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answered on 04 May 2011, 08:16 PM
I am trying to do the same thing.  I was able to modify the control template pretty easily.

<RepeatButton x:Name="MoveLeftYear" Grid.Column="0" Style="{StaticResource MoveLeftButtonStyle}"/>
<RepeatButton x:Name="MoveLeft" Grid.Column="1" Style="{StaticResource MoveLeftButtonStyle}"/>
<Button x:Name="Header" Grid.Column="2" Style="{StaticResource CalendarHeaderButton}"/>
<RepeatButton x:Name="MoveRight" Grid.Column="3" Style="{StaticResource MoveRightButtonStyle}"/>
<RepeatButton x:Name="MoveRightYear" Grid.Column="4" Style="{StaticResource MoveRightButtonStyle}"/>

However, I'm having a problem wiring up the command.  It looks like normally one would find the button in OnApplyTemplate and then wire up a click event.  This is code that I've tried but it isn't getting me anywhere.  

public class MyRadDatePicker : RadDatePicker
{
    public override void OnApplyTemplate()
    {
        base.OnApplyTemplate();
  
        // This doesn't work.  moveLeftYearButton is always null.
        var moveLeftYearButton = GetTemplateChild("MoveLeftYear") as RepeatButton;
  
        // I can get to the Calendar but I can't get to the calendar MoveNext button
        var button = GetTemplateChild("PART_DropDownButton") as RadDropDownButton;
        if (button != null)
        {
            var calendar = (RadCalendar) (((Panel) button.DropDownContent).Children[0]);
        }
    }
}

Any help would be great! Thanks,
-Marshall
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Marshall
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answered on 04 May 2011, 08:38 PM

Here is a little more info on what I'm trying to do and why I'm running into an issue.  I can wire up the two new buttons using Commanding like this:

<RepeatButton x:Name="MoveLeftYear" Grid.Column="0" Style="{StaticResource MoveLeftButtonStyle}" Command="{Binding PreviousYearClickCommand}"/>
<RepeatButton x:Name="MoveLeft" Grid.Column="1" Style="{StaticResource MoveLeftButtonStyle}"/>
<Button x:Name="Header" Grid.Column="2" Style="{StaticResource CalendarHeaderButton}"/>
<RepeatButton x:Name="MoveRight" Grid.Column="3" Style="{StaticResource MoveRightButtonStyle}"/>
<RepeatButton x:Name="MoveRightYear" Grid.Column="4" Style="{StaticResource MoveRightButtonStyle}" Command="{Binding NextYearClickCommand}"/>

public class MyRadDatePicker : RadDatePicker
{
    public MyRadDatePicker()
    {
        PreviousYearClickCommand = new DelegateCommand<object>(OnPreviousYearClickCommandExecuted);
        NextYearClickCommand = new DelegateCommand<object>(OnNextYearClickCommandExecuted);
        DataContext = this;
    }
  
    public ICommand PreviousYearClickCommand { get; private set; }
    public ICommand NextYearClickCommand { get; private set; }
  
    private void OnPreviousYearClickCommandExecuted(object obj)
    {
        DisplayDate = DisplayDate.AddYears(-1);
    }
  
    private void OnNextYearClickCommandExecuted(object obj)
    {
        DisplayDate = DisplayDate.AddYears(1);
    }
}

And everything seems to work.  The problem though is I'm running into a DataContext issue.  In order for the Commanding to work I need to set my DataContext to the control in my constructor.  This is fine until I start implementing MVVM and use this new control on a form.  The field that I'm using it on now seems to be disconnected from its viewmodel.  So when the user changes the date the viewmodel doesn't know.  I suspect it is because I'm changing the DataContext.  Not sure.  What do you think?

Thanks,
-Marshall
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Pana
Telerik team
answered on 11 May 2011, 04:01 PM
Hello,

You could extend RadCalendar instead and modify the ControlTemplate of the RadCalendar to contain the buttons. Then you could bind the Command="{TemplateBinding NextYear}" without interfering the DataContext.

Best wishes,
Pana
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Gabe
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Konstantina
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Marshall
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Pana
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