【万里征程——Windows App开发】DatePickerFlyout、TimePickerFlyout的使用

已经有挺长时间没有更新这个专栏了，不过刚才有网友私信问我一个问题现在就火速更新上一篇~

这一篇讲解在WP上DataPickerFlyout和TimePickerFlyout的使用，但它们只能在WP上跑哦~

 <Grid Background="Blue">  
        <Grid.RowDefinitions>
            <RowDefinition Height="*"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

            <StackPanel Grid.Row="0" Margin="12" Orientation="Vertical">     
                <Button Content="Let's Show DatePicker" >
                    <Button.Flyout>        
                        <DatePickerFlyout x:Name="datePickerFlyout" Title="选择日期" 
                                      DatePicked="datePickerFlyout_DatePicked" Closed="datePickerFlyout_Closed" />
                    </Button.Flyout>
                </Button>

                <DatePicker Header="Date"  Margin="4" />          
                <TextBlock Name="textBlockDate" FontSize="20" Margin="4" />            
            </StackPanel>

        <StackPanel Grid.Row="1" Margin="12" Orientation="Vertical">
            <Button Content="Let's Show TimePicker" >
                <Button.Flyout>
                    <TimePickerFlyout x:Name="timePickerFlyout" Title="选择时间" 
                                      TimePicked="timePickerFlyout_TimePicked" Closed="timePickerFlyout_Closed" />
                </Button.Flyout>
            </Button>

            <TimePicker Header="Time" Margin="4" />
            <TextBlock Name="textBlockTime" FontSize="20" Margin="4"/>             
        </StackPanel>                                      
    </Grid>

后台事件如下：

 public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();

            this.NavigationCacheMode = NavigationCacheMode.Required;
        }

        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            // 令天数加1
            datePickerFlyout.Date = DateTimeOffset.Now.AddDays(1);

            // 设置可选择的最大年份和最小年份
            datePickerFlyout.MinYear = DateTimeOffset.Now.AddYears(-100);   
            datePickerFlyout.MaxYear = DateTimeOffset.Now.AddYears(100);

            // 此处也可以令“年“、”月“、”日“中的某一个不显示
            datePickerFlyout.YearVisible = true;
            datePickerFlyout.MonthVisible = true;       
            datePickerFlyout.DayVisible = true;

            // 选择的历法
            // （Gregorian 公历, Hebrew 希伯来历, Hijri 回历, Japanese 日本历, Julian 罗马儒略历, Korean 朝鲜历, Taiwan 台湾历, Thai 泰国历, UmAlQura 古兰经历）
            datePickerFlyout.CalendarIdentifier = CalendarIdentifiers.Gregorian;                                                                                                         


            // Time - TimePicker 控件当前显示的时间
            timePickerFlyout.Time = new TimeSpan(18, 0, 0);

            // 设置TimePickerFlyout的分钟选择框内数字的增幅
            timePickerFlyout.MinuteIncrement = 2;                                                                                                           

            //设置为24小时制，也可以为12小时制
            timePickerFlyout.ClockIdentifier = ClockIdentifiers.TwentyFourHour;                 
        }

        // 当用户点击DatePicker的完成按钮后激活该事件
        private void datePickerFlyout_DatePicked(DatePickerFlyout sender, DatePickedEventArgs args)
        {                      
            textBlockDate.Text = args.NewDate.ToString("yyyy-MM-dd hh:mm:ss");
            textBlockDate.Text += Environment.NewLine;
        }

        // 当用户点击DatePicker的取消按钮或手机的返回按钮后激活该事件，当点击完成按钮后也将调用该事件
        private void datePickerFlyout_Closed(object sender, object e)
        {
            textBlockDate.Text += "You just close the DatePickerFlyout.";
            textBlockDate.Text += Environment.NewLine;
        }

        // 当用户点击TimePicker的完成按钮后激活该事件
        private void timePickerFlyout_TimePicked(TimePickerFlyout sender, TimePickedEventArgs args)
        {
            // e.OldTime - 原时间
            // e.NewTime - 新时间
            textBlockTime.Text = args.NewTime.ToString("c");
            textBlockTime.Text += Environment.NewLine;
        }

        // 当用户点击TimePicker的取消按钮或手机的返回按钮后激活该事件，当点击完成按钮后也将调用该事件
        private void timePickerFlyout_Closed(object sender, object e)
        {
            textBlockTime.Text += "You just close the TimePickerFlyout.";
            textBlockTime.Text += Environment.NewLine;
        }
    }

时间仓促就记录到这里咯，掰掰~

该网友说我刚写的不是他所需要的，so……重来一遍吧……

简单的讲，Flyout有两种创建方式，一种就是上面的通过Button的Flyout属性。另一种是通过FlyoutBase.AttachedFlyout属性给任何的FrameworkElement对象添加它。

关于FrameworkElement的更多知识，可以访问以下链接。

https://msdn.microsoft.com/zh-cn/library/vstudio/system.windows.frameworkelement(v=vs.100).aspx

https://msdn.microsoft.com/en-us/library/system.windows.frameworkelement(v=vs.110).aspx

而Flyout则有6种不同的类型：Flyout、DatePickerFlyout、ListPickerFlyout、MenuFlyout、TimePickerFlyout。

时间紧迫就直接Show代码了。

XAML代码：

    <Page.Resources>
        <Style TargetType="Button">
            <Setter Property="Margin" Value="12"/>
            <Setter Property="FontSize" Value="20"/>
            <Setter Property="Foreground"  Value="White"/>
            <Setter Property="Background" Value="Green"/>
        </Style>
    </Page.Resources>

    <Grid Background="Blue">
        <StackPanel Orientation="Vertical">
            <!-- Flyout -->
            <Button Content="Let's Show Flyout">
                <Button.Flyout>
                    <Flyout>
                        <StackPanel >
                            <TextBox PlaceholderText="What do you want to say?"/>
                            <Button HorizontalAlignment="Right" Content="Yup"/>
                        </StackPanel>
                    </Flyout>
                </Button.Flyout>
            </Button>

            <!-- DatePickerFlyout -->
            <Button Content="Let's Show DatePicker" HorizontalAlignment="Right">
                <Button.Flyout>
                    <DatePickerFlyout Title="You need to choose Date: "  DatePicked="DatePickerFlyout_DatePicked"/>
                </Button.Flyout>
            </Button>

            <!-- ListPickerFlyout -->
            <Button Content="Let's Show ListPicker" >
                <Button.Flyout>
                    <ListPickerFlyout x:Name="listPickerFlyout" Title="选择操作系统：" ItemsPicked="listPickerFlyout_ItemsPicked"  >
                        <ListPickerFlyout.ItemTemplate>
                            <DataTemplate>
                                <TextBlock Text="{Binding}" FontSize="30"></TextBlock>
                            </DataTemplate>
                        </ListPickerFlyout.ItemTemplate>
                    </ListPickerFlyout>
                </Button.Flyout>
            </Button>

            <!--  MenuFlyout -->
            <Button x:Name="menuFlyoutButton" Content="Let's Show MenuFlyout" HorizontalAlignment="Right">
                <Button.Flyout >
                    <MenuFlyout>
                        <MenuFlyoutItem Text="You just say yes?" Click="MenuFlyoutItem_Click"/>
                        <MenuFlyoutItem Text="You just say no?" Click="MenuFlyoutItem_Click"/>
                        <MenuFlyoutItem Text="You say nothing..." Click="MenuFlyoutItem_Click"/>
                    </MenuFlyout>
                </Button.Flyout>
            </Button>

            <!--  PickerFlyout -->
            <Button Content="Let's Show Picker" >
                <Button.Flyout>
                    <PickerFlyout  Confirmed="PickerFlyout_Confirmed" ConfirmationButtonsVisible="True">
                        <TextBlock Text="Are you ok?" FontSize="30" Margin="0 100 0 0"/>
                    </PickerFlyout>
                </Button.Flyout>
            </Button>

            <!-- TimePickerFlyout -->
            <Button Content="Let's Show TimePicker" HorizontalAlignment="Right">
                <Button.Flyout>
                    <TimePickerFlyout Title="You need to choose Time: "  TimePicked="TimePickerFlyout_TimePicked"/>
                </Button.Flyout>
            </Button>

            <!-- FlyoutBase -->
            <TextBlock Text="Game Over" Margin="12" Foreground="Wheat" Tapped="TextBlock_Tapped" FontSize="20">
                <FlyoutBase.AttachedFlyout>
                    <Flyout>
                        <TextBox Text="哎哟，不错哦！"/>
                    </Flyout>
                </FlyoutBase.AttachedFlyout>
            </TextBlock>
        </StackPanel>
    </Grid>

后台C#代码：

    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();
            // 绑定List数据到ListPickerFlyout
            listPickerFlyout.ItemsSource = new List<string> { "Windows 10", "Windows 8/8.1", "Windows 7", "Windows Vista", "Windows XP","Others" };
        }

        // DatePickerFlyout的日期选中事件，此处事件内有是包含日期的MessageDialog控件
        private async void DatePickerFlyout_DatePicked(DatePickerFlyout sender, DatePickedEventArgs args)
        {
            await new MessageDialog(args.NewDate.ToString()).ShowAsync();
        }

        // ListPickerFlyout的选中事件，选择列表中的一项后会以弹窗的方式显示出来
        private async void listPickerFlyout_ItemsPicked(ListPickerFlyout sender, ItemsPickedEventArgs args)
        {
            if (sender.SelectedItem != null)
            {
                await new MessageDialog("You choose: " + sender.SelectedItem.ToString()).ShowAsync();
            }
        }

        // MenuFlyout的菜单选项的点击事件，将选择的本文赋值给Content
        private void MenuFlyoutItem_Click(object sender, RoutedEventArgs e)
        {
            menuFlyoutButton.Content = (sender as MenuFlyoutItem).Text;
        }

        // PickerFlyout的确认事件，此处事件内有是包含字符串的MessageDialog控件
        private async void PickerFlyout_Confirmed(PickerFlyout sender, PickerConfirmedEventArgs args)
        {
            await new MessageDialog("You choose ok").ShowAsync();
        }

        // TimePickerFlyout的时间选中事件，此处事件内有是包含所选时间的MessageDialog控件
        private async void TimePickerFlyout_TimePicked(TimePickerFlyout sender, TimePickedEventArgs args)
        {
            await new MessageDialog(args.NewTime.ToString()).ShowAsync();
        }          

        // 通过FlyoutBase.ShowAttachedFlyout方法来展示出Flyout控件
        private void TextBlock_Tapped(object sender, TappedRoutedEventArgs e)
        {
            FrameworkElement element = sender as FrameworkElement;
            if (element != null)
            {
                FlyoutBase.ShowAttachedFlyout(element);
            }
        }    
    }

好了代码就到这里了，来几张截图。童鞋们看出来我的手机型号了么？

那这一篇就结束啦，我的手机是Lumia 638……

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