背水一战 Windows 10 (32) - 控件（选择类）: Selector, ComboBox

2021-05-12 22:26

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原文:背水一战 Windows 10 (32) - 控件（选择类）: Selector, ComboBox

[源码下载]

背水一战 Windows 10 (32) - 控件（选择类）: Selector, ComboBox

作者：webabcd

介绍
背水一战 Windows 10 之控件（选择类）

Selector
ComboBox

示例
1、Selector(基类) 的示例
Controls/SelectionControl/SelectorDemo.xaml

Page
    x:Class="Windows10.Controls.SelectionControl.SelectorDemo"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Windows10.Controls.SelectionControl"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    
    xmlns:common="using:Windows10.Common">

    Grid Background="Transparent">
        StackPanel Margin="10 0 10 10">

            TextBlock Name="textBlock" Margin="5" />

            
            ComboBox Name="comboBox1" Margin="5 20 5 5" ItemsSource="{x:Bind Employees}" Width="200" HorizontalAlignment="Left">
                ComboBox.ItemTemplate>
                    DataTemplate x:DataType="common:Employee">
                        StackPanel Orientation="Horizontal">
                            TextBlock Text="{x:Bind Name}" />
                            TextBlock Text="{x:Bind Age}" Margin="5 0 0 0" />
                        StackPanel>
                    DataTemplate>
                ComboBox.ItemTemplate>
            ComboBox>
            TextBlock Name="lblMsg1" Margin="5" />

            ComboBox Name="comboBox2" Margin="5 20 5 5" ItemsSource="{x:Bind Employees}" Width="200" HorizontalAlignment="Left">
                ComboBox.ItemTemplate>
                    DataTemplate x:DataType="common:Employee">
                        StackPanel Orientation="Horizontal">
                            TextBlock Text="{x:Bind Name}" />
                            TextBlock Text="{x:Bind Age}" Margin="5 0 0 0" />
                        StackPanel>
                    DataTemplate>
                ComboBox.ItemTemplate>
            ComboBox>
            TextBlock Name="lblMsg2" Margin="5" />


            
            ComboBox x:Name="comboBox3" Margin="5 20 5 5" Width="200" HorizontalAlignment="Left">
                ComboBoxItem Content="ComboBoxItem1" IsSelected="True" />
                ComboBoxItem Content="ComboBoxItem2" />
                ComboBoxItem Content="ComboBoxItem3" />
            ComboBox>

        StackPanel>
    Grid>
Page>

Controls/SelectionControl/SelectorDemo.xaml.cs

/*
 * Selector(基类) - 选择器控件基类（继承自 ItemsControl, 请参见 /Controls/CollectionControl/ItemsControlDemo/）
 *     SelectedIndex - 选中项的索引
 *     SelectedItem - 选中项的数据对象
 *     SelectedValuePath - 选中项的值的字段路径，默认值为空字符串（此时 SelectedValue 的结果与 SelectedItem 相同）
 *     SelectedValue - 选中项的值（字段路径通过 SelectedValuePath 设置）
 *     bool GetIsSelectionActive(DependencyObject element) - 用于获取指定的 Selector 控件是否是焦点状态
 *         如果是焦点状态，则按下键盘 enter 键会弹出此 Selector 控件的选项列表，按下 esc 键会隐藏此 Selector 控件的选项列表
 *     IsSynchronizedWithCurrentItem - 暂时认为没用吧，因为设置为 true 后，在 runtime 会报错
 *     SelectionChanged - 选中项发生变化时触发的事件
 *     
 *     
 * SelectorItem(基类) - Selector 的 Item（继承自 ContentControl, 请参见 /Controls/BaseControl/ContentControlDemo/）
 *     IsSelected - 是否被选中
 */

using System;
using System.Collections.ObjectModel;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows10.Common;

namespace Windows10.Controls.SelectionControl
{
    public sealed partial class SelectorDemo : Page
    {
        public ObservableCollection Employees { get; set; } = TestData.GetEmployees(30);

        public SelectorDemo()
        {
            this.InitializeComponent();

            this.Loaded += SelectorDemo_Loaded;

            // 不设置 SelectedValuePath，则 SelectedValue 的结果与 SelectedItem 相同
            comboBox1.SelectedValuePath = "";
            comboBox1.SelectionChanged += ComboBox1_SelectionChanged;

            // 指定 SelectedValue 的字段路径
            comboBox2.SelectedValuePath = "Name";
            comboBox2.SelectionChanged += ComboBox2_SelectionChanged;
        }

        private void SelectorDemo_Loaded(object sender, RoutedEventArgs e)
        {
            DispatcherTimer dTimer = new DispatcherTimer();
            dTimer.Interval = TimeSpan.Zero;
            dTimer.Tick += DTimer_Tick;
            dTimer.Start();
        }

        private void DTimer_Tick(object sender, object e)
        {
            textBlock.Text = $"comboBox1 focus:{ComboBox.GetIsSelectionActive(comboBox1)}, comboBox2 focus:{ComboBox.GetIsSelectionActive(comboBox2)}";
        }

        private void ComboBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            // e.RemovedItems - 本次事件中，被取消选中的项
            // e.AddedItems - 本次事件中，新被选中的项

            int selectedIndex = comboBox1.SelectedIndex;

            // SelectedItem 是选中的 Employee 对象
            // SelectedValue 是选中的 Employee 对象
            lblMsg1.Text = $"comboBox1 SelectedItem:{comboBox1.SelectedItem}, SelectedValue:{comboBox1.SelectedValue}";
        }

        private void ComboBox2_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            int selectedIndex = comboBox2.SelectedIndex;

            // SelectedItem 是选中的 Employee 对象
            // SelectedValue 是选中的 Employee 对象的 Name 属性的值
            lblMsg2.Text = $"comboBox2 SelectedItem:{comboBox2.SelectedItem}, SelectedValue:{comboBox2.SelectedValue}";
        }
    }
}

2、ComboBox 的示例
Controls/SelectionControl/ComboBoxDemo.xaml

Page
    x:Class="Windows10.Controls.SelectionControl.ComboBoxDemo"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Windows10.Controls.SelectionControl"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    
    xmlns:common="using:Windows10.Common">

    Grid Background="Transparent">
        StackPanel Margin="10 0 10 10">

            

            
            ComboBox x:Name="comboBox1" Margin="5" Width="200" HorizontalAlignment="Left" 
                      Header="comboBox1" PlaceholderText="PlaceholderText">
                ComboBoxItem Content="ComboBoxItem1" />
                ComboBoxItem Content="ComboBoxItem2" />
                ComboBoxItem Content="ComboBoxItem3" />
            ComboBox>
            TextBlock Name="lblMsg1" Margin="5" />

            
            ComboBox x:Name="comboBox2" ItemsSource="{x:Bind Employees}" Margin="5 20 5 5" Width="200" HorizontalAlignment="Left">
                ComboBox.HeaderTemplate>
                    DataTemplate>
                        TextBlock Text="comboBox2" Foreground="Red" />
                    DataTemplate>
                ComboBox.HeaderTemplate>
                ComboBox.ItemTemplate>
                    DataTemplate x:DataType="common:Employee">
                        StackPanel Orientation="Horizontal">
                            TextBlock Text="{x:Bind Name}" />
                            TextBlock Text="{x:Bind Age}" Margin="5 0 0 0" />
                        StackPanel>
                    DataTemplate>
                ComboBox.ItemTemplate>
            ComboBox>

            
            ComboBox Name="comboBox3" SelectedIndex="0" Width="200" HorizontalAlignment="Left" Margin="5 60 5 5">
                x:String>Redx:String>
                x:String>Greenx:String>
                x:String>Bluex:String>
            ComboBox>
            
        StackPanel>
    Grid>
Page>

Controls/SelectionControl/ComboBoxDemo.xaml.cs

/*
 * ComboBox - 下拉框控件（继承自 Selector, 请参见 /Controls/SelectionControl/SelectorDemo.xaml）
 *     DropDownOpened - 下拉框打开（弹出选项列表）时触发的事件
 *     DropDownClosed - 下拉框关闭（隐藏选项列表）时触发的事件
 *     IsDropDownOpen - 下拉框是否处于打开状态
 *     MaxDropDownHeight - 下拉框打开后，其选项列表的最大高度
 *     SelectionBoxItem - 下拉框关闭后显示的数据对象（即下拉框的选项列表隐藏后，在下拉框中显示的数据对象
 *     
 *     
 * ComboBoxItem - 下拉框控件的 item（继承自 SelectorItem, 请参见 /Controls/SelectionControl/SelectorDemo.xaml）
 */

using System.Collections.ObjectModel;
using Windows.UI.Xaml.Controls;
using Windows10.Common;

namespace Windows10.Controls.SelectionControl
{
    public sealed partial class ComboBoxDemo : Page
    {
        public ObservableCollection Employees { get; set; } = TestData.GetEmployees(30);

        public ComboBoxDemo()
        {
            this.InitializeComponent();

            comboBox1.DropDownOpened += ComboBox1_DropDownOpened;
            comboBox1.DropDownClosed += ComboBox1_DropDownClosed;

            comboBox2.MaxDropDownHeight = 40;
            comboBox2.Loaded += (x, y) => 
            {
                // 注：如果要设置 IsDropDownOpen 属性的话，需要等到 ComboBox 加载后在设置
                comboBox2.IsDropDownOpen = true;
            };
        }
        
        private void ComboBox1_DropDownOpened(object sender, object e)
        {
            lblMsg1.Text = "comboBox1 DropDownOpened";
        }

        private void ComboBox1_DropDownClosed(object sender, object e)
        {
            // 通过 SelectionBoxItem 可获取 ComboBox 的选项列表隐藏后，在 ComboBox 中显示的数据对象
            lblMsg1.Text = $"comboBox1 DropDownClosed, SelectionBoxItem:{comboBox1.SelectionBoxItem}";
        }
    }
}

OK
[源码下载]

背水一战 Windows 10 (32) - 控件（选择类）: Selector, ComboBox

标签：sync http model tran ble comm blend art load

原文地址：http://www.cnblogs.com/lonelyxmas/p/7567294.html

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背水一战 Windows 10 (32) - 控件（选择类）: Selector, ComboBox

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