Wpf - 在用户控制事件之后更新列表

时间：2014-06-07 11:31:20

标签： c# wpf xaml events user-controls

我在MainWindow.xaml中有一个WrapPanel，其中填充了（PlayerCard）用户控制子项。这些用户控件分别显示＆＃39; Player.cs＆＃39;属性。每个用户控件都有一个删除按钮，允许我删除WrapPanel中的一个PlayerCards。

我还有一个名为＆＃39; playerList＆＃39;的玩家对象列表。位于我的MainWindow.xaml.cs中，每次创建用户控件时我都会用它来写入/读取xml文件。

我所坚持的是如何在我的PlayerCard用户控件中单击我的删除按钮时修改MainWindow中的playerList。如何提醒MainWindow正在删除此用户控件？似乎解雇一个事件是合适的，但我不确定如何。

Player.cs：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Serialization;

namespace BaseballLinker.Objects
{
    public class Player
    {
        [XmlElement("Player Name")]
        public string name { get; set; }

        [XmlElement("MLB Link")]
        public string mlb { get; set; }

        [XmlElement("MiLB Link")]
        public string milb { get; set; }

        [XmlElement("ESPN Link")]
        public string espn { get; set; }

        [XmlElement("Baseball Referance Link")]
        public string baseballref { get; set; }

        [XmlElement("Fangraphs Link")]
        public string fangraphs { get; set; }
    }
}

MainWindow.xaml：

<Window x:Class="BaseballLinker.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="900" Width="1600" ResizeMode="CanMinimize">
    <Grid>
        <Grid.Background>
            <ImageBrush ImageSource="Assets/Images/Background.jpg"/>
        </Grid.Background>

        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="1*" />
            <ColumnDefinition Width="15*" />
            <ColumnDefinition Width="3*" />
            <ColumnDefinition Width="77*" />
            <ColumnDefinition Width="4*" />
        </Grid.ColumnDefinitions>

        <Grid Column="1">
            <Grid.RowDefinitions>
                <RowDefinition Height="14*" />
                <RowDefinition Height="71*" />
                <RowDefinition Height="15*" />
            </Grid.RowDefinitions>

            <StackPanel Grid.Row="1">
                <TextBlock Text="Add Player" FontSize="35" Foreground="White"/>

                <TextBox x:Name="Name" Margin="0,10" Style="{StaticResource TextBoxStyle}" GotKeyboardFocus="Name_GotKeyboardFocus"/>
                <TextBlock Text="Name" Margin="0,-15" FontSize="20" Foreground="White"/>

                <TextBox x:Name="MLB" Margin="0,35" Style="{StaticResource TextBoxStyle}" GotKeyboardFocus="MLB_GotKeyboardFocus"/>
                <TextBlock Text="MLB" Margin="0,-35" FontSize="20" Foreground="White"/>

                <TextBox x:Name="MiLB" Margin="0,25" Style="{StaticResource TextBoxStyle}" GotKeyboardFocus="MiLB_GotKeyboardFocus"/>
                <TextBlock Text="MiLB" Margin="0,-30" FontSize="20" Foreground="White"/>

                <TextBox x:Name="ESPN" Margin="0,25" Style="{StaticResource TextBoxStyle}" GotKeyboardFocus="ESPN_GotKeyboardFocus"/>
                <TextBlock Text="ESPN" Margin="0,-30" FontSize="20" Foreground="White"/>

                <TextBox x:Name="BRef" Margin="0,25" Style="{StaticResource TextBoxStyle}" GotKeyboardFocus="BRef_GotKeyboardFocus"/>
                <TextBlock Text="Baseball Referance" Margin="0,-30" FontSize="20" Foreground="White"/>

                <TextBox x:Name="FG" Margin="0,25" Style="{StaticResource TextBoxStyle}" GotKeyboardFocus="FG_GotKeyboardFocus"/>
                <TextBlock Text="Fangraphs" Margin="0,-30" FontSize="20" Foreground="White"/>

                <Button x:Name="Add" Margin="0,30" Height="35" Width="125" Content="Add Player" HorizontalAlignment="Right" Click="Add_Click" />
            </StackPanel>
        </Grid>

        <Grid Grid.Column="3">
            <Grid.RowDefinitions>
                <RowDefinition Height="16*" />
                <RowDefinition Height="80*" />
                <RowDefinition Height="4*" />
            </Grid.RowDefinitions>

            <DockPanel Grid.Row="1">
                <ScrollViewer VerticalScrollBarVisibility="Auto">
                    <WrapPanel x:Name="PlayerCardList" Orientation="Horizontal" VerticalAlignment="Top" />
                </ScrollViewer>
            </DockPanel>
        </Grid>
    </Grid>
</Window>

MainWindow.xaml.cs：

using BaseballLinker.Objects;
using BaseballLinker.User_Controls;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Xml.Serialization;

namespace BaseballLinker
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window, INotifyPropertyChanged
    {
        public MainWindow()
        {
            WindowStartupLocation = System.Windows.WindowStartupLocation.CenterScreen;
            InitializeComponent();

            loadPlayerList();
            populatePanel();

            this.Name.Focus();
        }

        private ObservableCollection<Player> playerList;
        public ObservableCollection<Player> PlayerList
        {
            get { return playerList; }
            set
            {
                OnPropertyChanged("playerList");
            }
        }

        protected virtual void OnPropertyChanged(string propName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propName));
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;

        private void Add_Click(object sender, RoutedEventArgs e)
        {
            if (Name.Text != "")
            {
                var playerCard = new PlayerCard(Name.Text, MLB.Text, MiLB.Text, ESPN.Text, BRef.Text, FG.Text);

                PlayerCardList.Children.Add(playerCard);

                //Add Player Object To PlayerList
                Player p = new Player { name = Name.Text, 
                    mlb = MLB.Text, 
                    milb = MiLB.Text, 
                    espn = ESPN.Text, 
                    baseballref = BRef.Text, 
                    fangraphs = FG.Text };

                playerList.Add(p);

                App.SerializeToXML(playerList);

                clearFields();
            }
            else
            {
                MessageBox.Show("A name is required.");
                Name.Focus();
            }
        }

        private void clearFields()
        {
            Name.Clear();
            MLB.Clear();
            MiLB.Clear();
            ESPN.Clear();
            BRef.Clear();
            FG.Clear();
            Name.Focus();
        }

        public void loadPlayerList()
        {
            try
            {
                playerList = App.DeserializeFromXML();
            }
            catch (Exception e)
            {
                playerList = new ObservableCollection<Player>();
            }
        }

        public void populatePanel()
        {
            foreach (Player p in playerList)
            {
                var playerCard = new PlayerCard(p.name, p.mlb, p.milb, p.espn, p.baseballref, p.fangraphs);

                PlayerCardList.Children.Add(playerCard);
            }
        }

        private void Name_GotKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
        {
            if (e.KeyboardDevice.IsKeyDown(Key.Tab))
                ((TextBox)sender).SelectAll();
        }

        private void MLB_GotKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
        {
            if (e.KeyboardDevice.IsKeyDown(Key.Tab))
                ((TextBox)sender).SelectAll();
        }

        private void MiLB_GotKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
        {
            if (e.KeyboardDevice.IsKeyDown(Key.Tab))
                ((TextBox)sender).SelectAll();
        }

        private void ESPN_GotKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
        {
            if (e.KeyboardDevice.IsKeyDown(Key.Tab))
                ((TextBox)sender).SelectAll();
        }

        private void BRef_GotKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
        {
            if (e.KeyboardDevice.IsKeyDown(Key.Tab))
                ((TextBox)sender).SelectAll();
        }

        private void FG_GotKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
        {
            if (e.KeyboardDevice.IsKeyDown(Key.Tab))
                ((TextBox)sender).SelectAll();
        }
    }
}

PlayerCard.xaml（用户控制）

<UserControl x:Class="BaseballLinker.User_Controls.PlayerCard"
             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="225" d:DesignWidth="200" Height="225" Width="200">
    <Border BorderBrush="Black" BorderThickness="3" Margin="5">
    <Grid Background="LightGray">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="5*" />
            <ColumnDefinition Width="90*" />
            <ColumnDefinition Width="5*" />
        </Grid.ColumnDefinitions>

        <Grid.RowDefinitions>
            <RowDefinition Height="5*" />
            <RowDefinition Height="31" />
            <RowDefinition Height="18*" />
            <RowDefinition Height="18*" />
            <RowDefinition Height="18*" />
            <RowDefinition Height="10*" />
        </Grid.RowDefinitions>

            <Button x:Name="DeleteButton" Grid.Column="1" Width="25" Content="X" HorizontalAlignment="Right" FontSize="5" Click="DeleteButton_Click" />
            <TextBlock x:Name="PlayerName" Grid.Column="1" Grid.Row="1" HorizontalAlignment="Center" VerticalAlignment="Bottom" />

            <Button x:Name="MLBButton" Content="MLB" IsEnabled="False" HorizontalAlignment="Left" 
                    Grid.Column="1" Grid.Row="2" Width="75" Height="25" VerticalAlignment="Bottom" Click="MLBButton_Click" />
            <Button x:Name="MiLBButton" Content="MiLB" IsEnabled="False" HorizontalAlignment="Right" 
                    Grid.Column="1" Grid.Row="2" Width="75" Height="25" VerticalAlignment="Bottom" Click="MiLBButton_Click" />

            <Button x:Name="ESPNButton" Content="ESPN" IsEnabled="False" HorizontalAlignment="Left" 
                    Grid.Column="1" Grid.Row="3" Width="75" Height="25" VerticalAlignment="Bottom" Click="ESPNButton_Click" />
            <Button x:Name="BRButton" Content="BRef" IsEnabled="False" HorizontalAlignment="Right" 
                    Grid.Column="1" Grid.Row="3" Width="75" Height="25" VerticalAlignment="Bottom" Click="BRButton_Click" />

            <Button x:Name="FGButton" Content="Fangraphs" IsEnabled="False" HorizontalAlignment="Center" 
                    Grid.Column="1" Grid.Row="4" Width="75" Height="25" VerticalAlignment="Bottom" Click="FGButton_Click" />
        </Grid>
    </Border>
</UserControl>

PlayerCard.xaml.cs 

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace BaseballLinker.User_Controls
{
    /// <summary>
    /// Interaction logic for PlayerCard.xaml
    /// </summary>
    public partial class PlayerCard : UserControl
    {
        private string mlbURL;
        private string milbURL;
        private string espnURL;
        private string baseballRefURL;
        private string fangraphsURL;

        public PlayerCard(string name, string mlb, string milb, string espn, string baseballRef, string fangraphs)
        {
            InitializeComponent();

            PlayerName.Text = name;

            //Check if URLs are empty & modify button state.
            mlbURL = linkCheck(mlb, MLBButton);
            milbURL = linkCheck(milb, MiLBButton);
            espnURL = linkCheck(espn, ESPNButton);
            baseballRefURL = linkCheck(baseballRef, BRButton);
            fangraphsURL = linkCheck(fangraphs, FGButton);
        }

        private string linkCheck(string site, UIElement button)
        {
            if (site != "")
            {
                button.IsEnabled = true;
            }

            return site;
        }

        private void ESPNButton_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                Process.Start(espnURL);
            }
            catch(Exception ex)
            {
                MessageBox.Show("Invalid URL");
            }
        }

        private void MLBButton_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                Process.Start(mlbURL);
            }
            catch (Exception ex)
            {
                MessageBox.Show("Invalid URL");
            }
        }

        private void MiLBButton_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                Process.Start(milbURL);
            }
            catch (Exception ex)
            {
                MessageBox.Show("Invalid URL");
            }
        }

        private void BRButton_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                Process.Start(baseballRefURL);
            }
            catch (Exception ex)
            {
                MessageBox.Show("Invalid URL");
            }
        }

        private void FGButton_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                Process.Start(fangraphsURL);
            }
            catch (Exception ex)
            {
                MessageBox.Show("Invalid URL");
            }
        }

        private void DeleteButton_Click(object sender, RoutedEventArgs e)
        {
            ((Panel)this.Parent).Children.Remove(this);
        }
    }
}

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