Overriding Calendar Style in DatePicker
calendar, datepicker, wpf, xaml
Solution
I figured it out. For whatever reason this part is important for this all to function...
<CalendarItem x:Name="PART_CalendarItem"... />
I'm not quite sure why, but I do remember removing it at some point thinking it wasn't doing anything, but without that line the date picked never populates the text box or the backing property.
Problem
So I wrote this code a while ago and it used to work fine, but recently for whatever reason now it doesn't work at all. Here's the xaml... ``` <DatePicker SelectedDate="{Binding Criteria}" IsEnabled="{Binding IsEnabled}" Width="130" HorizontalAlignment="Right"> <DatePicker.CommandBindings> <CommandBinding Command="controls:DateCommands.SelectToday" CanExecute="CommandBinding_CanExecute" Executed="CommandBinding_Executed"/> </DatePicker.CommandBindings> <DatePicker.CalendarStyle> <Style TargetType="{x:Type Calendar}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type Calendar}"> <TabControl> <TabItem Header="Calender"> <CalendarItem Background="{TemplateBinding Control.Background}" BorderBrush="{TemplateBinding Control.BorderBrush}" BorderThickness="{TemplateBinding Control.BorderThickness}" Style="{TemplateBinding Calendar.CalendarItemStyle}" /> </TabItem> <TabItem Header="Relative Time"> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition/> <ColumnDefinition/> </Grid.ColumnDefinitions> <Button Grid.Column="0" Command="controls:DateCommands.SelectToday" CommandParameter="Today" Content="Today" /> <Button Grid.Column="1" Command="controls:DateCommands.SelectToday" CommandParameter="Yesterday" Content="Yesterday" /> </Grid> </TabItem> </TabControl> </ControlTemplate> </Setter.Value> </Setter> </Style> </DatePicker.CalendarStyle> </DatePicker> ``` Basically I am overriding the calendar of the date picker and putting in a tab control that allows the user to select a relative time macro rather than an actual time (causing the generated query to always use that relative time). This used to work fine, but now whenever I try to select from the calendar nothing happens and no values are ever populated in the box, or in the backing property. I took the code out and dumped it into a new project to experiment and couldn't get this simple case to even work... ``` <DatePicker Width="130" HorizontalAlignment="Right"> <DatePicker.CalendarStyle> <Style TargetType="{x:Type Calendar}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type Calendar}"> <CalendarItem Background="{TemplateBinding Control.Background}" BorderBrush="{TemplateBinding Control.BorderBrush}" BorderThickness="{TemplateBinding Control.BorderThickness}" Style="{TemplateBinding Calendar.CalendarItemStyle}" /> </ControlTemplate> </Setter.Value> </Setter> </Style> </DatePicker.CalendarStyle> </DatePicker> ``` This code does the same thing, whenever you try to pick a date from the calendar, nothing happens. This used to work, and to my knowledge nothing has changed, anybody have any insight on what's going on, or perhaps a better implementation of what I am trying to do?