c# - WPF 中的时间条目/选择器控件

Question

WPF 中是否有任何时间输入/选择器控件可用，例如日期选择器？

谢谢

Answer 1

我在网上找不到，所以我从头开始创建它。我不完全理解依赖属性，所以我现在省略了那些。该控件是一个 12 小时时间选择器控件。我是 WPF 的新手，所以我不完全理解所有新的语言语法，但这个控件将在我在家创建的项目中为我解决问题。

它支持将时间设置为 DateTime 或 TimeSpan。

下面我将粘贴 XAML 和代码隐藏。XAML

<UserControl x:Class="WorkDayManager3.WPF.UserControls.TimeControl"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             d:DesignHeight="35" d:DesignWidth="100">
    <Border BorderBrush="LightBlue" BorderThickness="1" Margin="1">
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition />
                <ColumnDefinition Width="5" />
                <ColumnDefinition />
                <ColumnDefinition />
                <ColumnDefinition />
            </Grid.ColumnDefinitions>
            <TextBox x:Name="txtHours" BorderThickness="0" MaxLength="2" TextAlignment="Center" HorizontalAlignment="Center" VerticalAlignment="Center" Text="1" KeyUp="txt_KeyUp" MouseWheel="txt_MouseWheel" PreviewKeyUp="txt_PreviewKeyUp" />
            <TextBlock Text=":" Grid.Column="1" HorizontalAlignment="Center" VerticalAlignment="Center" />
            <TextBox x:Name="txtMinutes" BorderThickness="0" MaxLength="2" TextAlignment="Center" Grid.Column="2" HorizontalAlignment="Center" VerticalAlignment="Center" Text="00" KeyUp="txt_KeyUp" MouseWheel="txt_MouseWheel" PreviewKeyUp="txt_PreviewKeyUp" />
            <TextBox x:Name="txtAmPm" BorderThickness="0" MaxLength="2" TextAlignment="Center" Grid.Column="3" HorizontalAlignment="Left" VerticalAlignment="Center" PreviewTextInput="txtAmPm_PreviewTextInput" Text="AM" KeyUp="txt_KeyUp" MouseWheel="txt_MouseWheel" Padding="0, 0, 3, 0" />
            <Grid Grid.Column="4">
                <Grid.RowDefinitions>
                    <RowDefinition />
                    <RowDefinition />
                </Grid.RowDefinitions>
                <Button x:Name="btnUp" Focusable="False" Click="btnUp_Click">
                    <TextBlock Text="p" FontFamily="Wingdings 3" HorizontalAlignment="Center" VerticalAlignment="Center" />
                </Button>
                <Button x:Name="btnDown" Grid.Row="1" Focusable="False" Click="btnDown_Click">
                    <TextBlock Text="q" FontFamily="Wingdings 3" HorizontalAlignment="Center" VerticalAlignment="Center" />
                </Button>
            </Grid>
        </Grid>
    </Border>
</UserControl>

代码隐藏

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

namespace WorkDayManager3.WPF.UserControls
{
    /// <summary>
    /// Interaction logic for TimeControl.xaml
    /// </summary>
    public partial class TimeControl : UserControl
    {
        public TimeControl()
        {
            InitializeComponent();
        }

        #region Properties

        /// <summary>
        /// Gets or sets the date time value.
        /// </summary>
        /// <value>The date time value.</value>
        public DateTime? DateTimeValue
        {
            get
            {
                string hours = this.txtHours.Text;
                string minutes = this.txtMinutes.Text;
                string amPm = this.txtAmPm.Text;
                if (!string.IsNullOrWhiteSpace(hours)
                    && !string.IsNullOrWhiteSpace(minutes)
                    && !string.IsNullOrWhiteSpace(amPm))
                {
                    string value = string.Format("{0}:{1} {2}", this.txtHours.Text, this.txtMinutes.Text, this.txtAmPm.Text);
                    DateTime time = DateTime.Parse(value);
                    return time;
                }
                else
                {
                    return null;
                }
            }
            set
            {
                DateTime? time = value;
                if (time.HasValue)
                {
                    string timeString = time.Value.ToShortTimeString();
                    //9:54 AM
                    string[] values = timeString.Split(':', ' ');
                    if (values.Length == 3)
                    {
                        this.txtHours.Text = values[0];
                        this.txtMinutes.Text = values[1];
                        this.txtAmPm.Text = values[2];
                    }
                }
            }
        }

        /// <summary>
        /// Gets or sets the time span value.
        /// </summary>
        /// <value>The time span value.</value>
        public TimeSpan? TimeSpanValue
        {
            get
            {
                DateTime? time = this.DateTimeValue;
                if (time.HasValue)
                {
                    return new TimeSpan(time.Value.Ticks);
                }
                else
                {
                    return null;
                }
            }
            set
            {
                TimeSpan? timeSpan = value;
                if (timeSpan.HasValue)
                {
                    this.DateTimeValue = new DateTime(timeSpan.Value.Ticks);
                }
            }
        }

        #endregion

        #region Event Subscriptions

        /// <summary>
        /// Handles the Click event of the btnDown control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="System.Windows.RoutedEventArgs"/> instance containing the event data.</param>
        private void btnDown_Click(object sender, RoutedEventArgs e)
        {
            string controlId = this.GetControlWithFocus().Name;
            if ("txtHours".Equals(controlId))
            {
                this.ChangeHours(false);
            }
            else if ("txtMinutes".Equals(controlId))
            {
                this.ChangeMinutes(false);
            }
            else if ("txtAmPm".Equals(controlId))
            {
                this.ToggleAmPm();
            }
        }

        /// <summary>
        /// Handles the Click event of the btnUp control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="System.Windows.RoutedEventArgs"/> instance containing the event data.</param>
        private void btnUp_Click(object sender, RoutedEventArgs e)
        {
            string controlId = this.GetControlWithFocus().Name;
            if ("txtHours".Equals(controlId))
            {
                this.ChangeHours(true);
            }
            else if ("txtMinutes".Equals(controlId))
            {
                this.ChangeMinutes(true);
            }
            else if ("txtAmPm".Equals(controlId))
            {
                this.ToggleAmPm();
            }
        }

        /// <summary>
        /// Handles the PreviewTextInput event of the txtAmPm control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="System.Windows.Input.TextCompositionEventArgs"/> instance containing the event data.</param>
        private void txtAmPm_PreviewTextInput(object sender, TextCompositionEventArgs e)
        {
            // prevent users to type text
            e.Handled = true;
        }

        /// <summary>
        /// Handles the KeyUp event of the txt control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="System.Windows.Input.KeyEventArgs"/> instance containing the event data.</param>
        private void txt_KeyUp(object sender, KeyEventArgs e)
        {
            // check for up and down keyboard presses
            if (Key.Up.Equals(e.Key))
            {
                btnUp_Click(this, null);
            }
            else if (Key.Down.Equals(e.Key))
            {
                btnDown_Click(this, null);
            }
        }

        /// <summary>
        /// Handles the MouseWheel event of the txt control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="System.Windows.Input.MouseWheelEventArgs"/> instance containing the event data.</param>
        private void txt_MouseWheel(object sender, MouseWheelEventArgs e)
        {
            if (e.Delta > 0)
            {
                btnUp_Click(this, null);
            }
            else
            {
                btnDown_Click(this, null);
            }
        }

        /// <summary>
        /// Handles the PreviewKeyUp event of the txt control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="System.Windows.Input.KeyEventArgs"/> instance containing the event data.</param>
        private void txt_PreviewKeyUp(object sender, KeyEventArgs e)
        {
            TextBox textBox = (TextBox)sender;
            // make sure all characters are number
            bool allNumbers = textBox.Text.All(Char.IsNumber);
            if (!allNumbers)
            {
                e.Handled = true;
                return;
            }


            // make sure user did not enter values out of range
            int value;
            int.TryParse(textBox.Text, out value);
            if ("txtHours".Equals(textBox.Name) && value > 12)
            {
                EnforceLimits(e, textBox);
            }
            else if ("txtMinutes".Equals(textBox.Name) && value > 59)
            {
                EnforceLimits(e, textBox);
            }
        }

        #endregion

        #region Methods

        /// <summary>
        /// Changes the hours.
        /// </summary>
        /// <param name="isUp">if set to <c>true</c> [is up].</param>
        private void ChangeHours(bool isUp)
        {
            int value = Convert.ToInt32(this.txtHours.Text);
            if (isUp)
            {
                value += 1;
                if (value == 13)
                {
                    value = 1;
                }
            }
            else
            {
                value -= 1;
                if (value == 0)
                {
                    value = 12;
                }
            }
            this.txtHours.Text = Convert.ToString(value);
        }

        /// <summary>
        /// Changes the minutes.
        /// </summary>
        /// <param name="isUp">if set to <c>true</c> [is up].</param>
        private void ChangeMinutes(bool isUp)
        {
            int value = Convert.ToInt32(this.txtMinutes.Text);
            if (isUp)
            {
                value += 1;
                if (value == 60)
                {
                    value = 0;
                }
            }
            else
            {
                value -= 1;
                if (value == -1)
                {
                    value = 59;
                }
            }

            string textValue = Convert.ToString(value);
            if (value < 10)
            {
                textValue = "0" + Convert.ToString(value);
            }
            this.txtMinutes.Text = textValue;
        }

        /// <summary>
        /// Enforces the limits.
        /// </summary>
        /// <param name="e">The <see cref="System.Windows.Input.KeyEventArgs"/> instance containing the event data.</param>
        /// <param name="textBox">The text box.</param>
        /// <param name="enteredValue">The entered value.</param>
        private static void EnforceLimits(KeyEventArgs e, TextBox textBox)
        {
            string enteredValue = GetEnteredValue(e.Key);
            string text = textBox.Text.Replace(enteredValue, "");
            if (string.IsNullOrEmpty(text))
            {
                text = enteredValue;
            }
            textBox.Text = text;
            e.Handled = true;
        }

        /// <summary>
        /// Gets the control with focus.
        /// </summary>
        /// <returns></returns>
        private TextBox GetControlWithFocus()
        {
            TextBox txt = new TextBox();
            if (this.txtHours.IsFocused)
            {
                txt = this.txtHours;
            }
            else if (this.txtMinutes.IsFocused)
            {
                txt = this.txtMinutes;
            }
            else if (this.txtAmPm.IsFocused)
            {
                txt = this.txtAmPm;
            }
            return txt;
        }

        /// <summary>
        /// Gets the entered value.
        /// </summary>
        /// <param name="key">The key.</param>
        /// <returns></returns>
        private static string GetEnteredValue(Key key)
        {
            string value = string.Empty;
            switch (key)
            {
                case Key.D0:
                case Key.NumPad0:
                    value = "0";
                    break;
                case Key.D1:
                case Key.NumPad1:
                    value = "1";
                    break;
                case Key.D2:
                case Key.NumPad2:
                    value = "2";
                    break;
                case Key.D3:
                case Key.NumPad3:
                    value = "3";
                    break;
                case Key.D4:
                case Key.NumPad4:
                    value = "4";
                    break;
                case Key.D5:
                case Key.NumPad5:
                    value = "5";
                    break;
                case Key.D6:
                case Key.NumPad6:
                    value = "6";
                    break;
                case Key.D7:
                case Key.NumPad7:
                    value = "7";
                    break;
                case Key.D8:
                case Key.NumPad8:
                    value = "8";
                    break;
                case Key.D9:
                case Key.NumPad9:
                    value = "9";
                    break;
            }
            return value;
        }

        /// <summary>
        /// Toggles the am pm.
        /// </summary>
        private void ToggleAmPm()
        {
            if ("AM".Equals(this.txtAmPm.Text))
            {
                this.txtAmPm.Text = "PM";
            }
            else
            {
                this.txtAmPm.Text = "AM";
            }
        }

        #endregion
    }
}

这就是控件，您可以根据需要随意进行修改。它并不完美，但比我发现的其他控件要好