添加「今日按鈕」日曆控件

Question

我在我的WPF MVVM應用程序中具有以下樣式。

<Style x:Key="DefaultCalendar" TargetType="Calendar"> 
    <Setter Property="Template"> 
     <Setter.Value> 
      <ControlTemplate TargetType="{x:Type Calendar}"> 
       <StackPanel HorizontalAlignment="Center" Name="PART_Root"> 
        <CalendarItem Background="{TemplateBinding Control.Background}" BorderBrush="{TemplateBinding Control.BorderBrush}" BorderThickness="{TemplateBinding Control.BorderThickness}" Name="PART_CalendarItem" Style="{TemplateBinding Calendar.CalendarItemStyle}" /> 
        <Button Content="Today" Command="Commands:CalendarCommands.SelectToday" CommandParameter="{Binding RelativeSource={RelativeSource Mode=TemplatedParent}}"/> 
       </StackPanel> 
      </ControlTemplate> 
     </Setter.Value> 
    </Setter> 
</Style> 

我創建的命令類

namespace Viterra.Freight.Client.Resources.Commands 
{ 
    public class CalendarCommands 
    { 
     public static RoutedCommand SelectToday = new RoutedCommand("Today", typeof(CalendarCommands)); 
    } 
} 

，並顯示日曆打開時，然而，該按鈕被禁用。我確信我需要使用這個路由命令做更多的事情，所以它設置日期，但我不知道什麼或在哪裏。

編輯：最終解決 請注意，我還修改的DatePicker使用該日曆的風格，所有的時間。

<Style x:Key="DefaultCalendar" TargetType="Calendar"> 
    <Setter Property="Template"> 
     <Setter.Value> 
      <ControlTemplate TargetType="{x:Type Calendar}"> 
       <StackPanel HorizontalAlignment="Center" Name="PART_Root"> 
        <CalendarItem Background="{TemplateBinding Control.Background}" BorderBrush="{TemplateBinding Control.BorderBrush}" BorderThickness="{TemplateBinding Control.BorderThickness}" Name="PART_CalendarItem" Style="{TemplateBinding Calendar.CalendarItemStyle}" /> 
        <Button Content="Today" Command="Commands:CalendarCommands.SelectToday" CommandParameter="{Binding RelativeSource={RelativeSource Mode=TemplatedParent}}" /> 
       </StackPanel> 
      </ControlTemplate> 
     </Setter.Value> 
    </Setter> 
</Style> 

<!-- style for default datepicker --> 
<Style x:Key="DefaultDatePicker" TargetType="DatePicker"> 
    <Setter Property="Height" Value="23"/> 
    <Setter Property="VerticalAlignment" Value="Center"/> 
    <Setter Property="CalendarStyle" Value="{StaticResource DefaultCalendar}" /> 
    <Setter Property="Validation.ErrorTemplate" Value="{StaticResource DateTimeValidationTemplate}" /> 
    <Style.Triggers> 
     <Trigger Property="Validation.HasError" Value="true"> 
      <Setter Property="ToolTip" Value="{Binding RelativeSource={x:Static RelativeSource.Self}, Path=(Validation.Errors).CurrentItem.ErrorContent}"/> 
     </Trigger> 
    </Style.Triggers> 
</Style> 

而且CalendarCommands.cs

using System; 
using System.Windows.Input; 
using System.Windows.Controls; 

namespace Viterra.Freight.Client.Resources.Commands 
{ 
    public static class CalendarCommands 
    { 
     private static readonly SelectTodayCommand _selectTodayCommand = new SelectTodayCommand(); 

     public static ICommand SelectToday 
     { 
      get { return _selectTodayCommand; } 
     } 

     private sealed class SelectTodayCommand : ICommand 
     { 
      public event EventHandler CanExecuteChanged 
      { 
       add { CommandManager.RequerySuggested += value; } 
       remove { CommandManager.RequerySuggested -= value; } 
      } 

      public bool CanExecute(object parameter) 
      { 
       return parameter is Calendar; 
      } 

      public void Execute(object parameter) 
      { 
       var calendar = parameter as Calendar; 
       if (calendar == null) 
        return; 

       var today = DateTime.Today; 
       calendar.SelectedDate = today; 
       calendar.DisplayDate = today; 
      } 
     } 
    } 
} 

Answer 1

另外，如果你不想使用代碼隱藏和CommandBindings，你可以用一個簡單的ICommand實現，而不是：

public static class CalendarCommands 
{ 
    private static readonly SelectTodayCommand _selectToday = new SelectTodayCommand(); 

    public static ICommand SelectToday 
    { 
     get { return _selectToday; } 
    } 

    private sealed class SelectTodayCommand : ICommand 
    { 
     public event EventHandler CanExecuteChanged 
     { 
     add { CommandManager.RequerySuggested += value; } 
     remove { CommandManager.RequerySuggested -= value; } 
     } 

     public bool CanExecute(object parameter) 
     { 
     return parameter is Calendar; 
     } 

     public void Execute(object parameter) 
     { 
     var calendar = parameter as Calendar; 
     if (calendar != null) 
     { 
      DateTime today = DateTime.Today; 
      calendar.SelectedDate = today; 
      calendar.DisplayDate = today; 
     } 
     } 
    } 
} 

Answer 2

你剛纔忘了把化CommandBindings :)

這裏是一個小工作示例：

MainWindow.xaml

<Window x:Class="WpfApplication13.MainWindow" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     xmlns:Commands="clr-namespace:WpfApplication13" 
     Title="MainWindow" Height="350" Width="525"> 

    <Window.CommandBindings> 
     <CommandBinding Command="Commands:CalendarCommands.SelectToday" 
         Executed="SelectTodayExecuted" 
         CanExecute="SelectTodayCanExecute"/> 
    </Window.CommandBindings> 

    <Window.Resources> 
     <Style x:Key="DefaultCalendar" TargetType="Calendar"> 
      <Setter Property="Template"> 
       <Setter.Value> 
        <ControlTemplate TargetType="{x:Type Calendar}"> 
         <StackPanel HorizontalAlignment="Center" Name="PART_Root"> 
          <CalendarItem Background="{TemplateBinding Control.Background}" BorderBrush="{TemplateBinding Control.BorderBrush}" BorderThickness="{TemplateBinding Control.BorderThickness}" Name="PART_CalendarItem" Style="{TemplateBinding Calendar.CalendarItemStyle}" /> 
          <Button Content="Today" Command="Commands:CalendarCommands.SelectToday" CommandParameter="{Binding RelativeSource={RelativeSource Mode=TemplatedParent}}"/> 
         </StackPanel> 
        </ControlTemplate> 
       </Setter.Value> 
      </Setter> 
     </Style> 
    </Window.Resources> 

    <Grid> 
     <Calendar Style="{StaticResource DefaultCalendar}" /> 
    </Grid> 
</Window> 

個

MainWindow.xaml.cs

using System.Windows; 
using System.Windows.Input; 

namespace WpfApplication13 
{ 
    /// <summary> 
    /// Interaction logic for MainWindow.xaml 
    /// </summary> 
    public partial class MainWindow : Window 
    { 
     public MainWindow() 
     { 
      InitializeComponent(); 
     } 

     private void SelectTodayExecuted(object target, ExecutedRoutedEventArgs e) 
     { 
      // Implement logic here 
     } 

     private void SelectTodayCanExecute(object target, CanExecuteRoutedEventArgs e) 
     { 
      e.CanExecute = true; 
     } 
    } 

    public class CalendarCommands 
    { 
     public static RoutedCommand SelectToday = new RoutedCommand("Today", typeof(CalendarCommands)); 
    } 
}