我需要一个横向组织的ItemsControl
,它将所有项目限制为相同的宽度。我正在使用的项目是UserControl
,并构建一个自动调整大小的TextBlock
,显示一个int值(包含在依赖项属性中),周围有Border
。问题是较小的值会导致较窄的项目,并且我需要所有项目都相同。我考虑了一些解决方案,但我似乎无法做任何工作。
第一种方法是将ItemsPanel
模板设置为Grid
。这样我可以使用代码隐藏生成基于数据源所需的列数,并将所有列宽设置为*
。谜题是弄清楚如何为每个项目设置网格列附加属性。
第二种解决方案是将ItemsPanel
模板设置为StackPanel
。这会自动正确排列项目,但我无法将每个项目的宽度设置为最宽项目的宽度。
最后一个解决方案是将ItemsPanel
模板设置为带有代码隐藏的UniformGrid
,以便在数据源发生更改时设置列数。这将自动正确地排列物品并提供均匀的宽度。我的问题在于我根本无法显示任何项目。我试过手动添加按钮,它们显示很好。我的UserControl
不会出现。我在下面列出了这个解决方案。
<Window x:Class="Learning_WPF.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:my="clr-namespace:Learning_WPF"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
Title="DateTape" Height="176" Width="500">
<Window.Resources>
<my:DateList x:Key="dateList" CollectionChanged="DateList_CollectionChanged" />
</Window.Resources>
<ItemsControl x:Name="itemsControl1" ItemsSource="{Binding Source={StaticResource dateList}, Path=/}" Grid.Row="1">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<UniformGrid x:Name="daysGrid" Rows="1" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
</ItemsControl>
</Window>
public partial class MainWindow : Window
{
UniformGrid daysGrid;
DateList dateList;
public MainWindow()
{
InitializeComponent();
daysGrid = (UniformGrid)itemsControl1.ItemsPanel.LoadContent();
dateList = (DateList)FindResource("dateList");
dateList.Fill(DateTime.Today, DateTime.Today.AddDays(10));
}
private void DateList_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
{
daysGrid.Columns = dateList.Count;
}
}
public class DateList : ObservableCollection<Date>
{
public void Fill(DateTime first, DateTime last)
{
// implementation fills the array with all of the days between first and last, inclusively
}
}
也许有更好的方法来实现我想要实现的目标(可能比控件更具图形性)......
答案 0 :(得分:1)
如果UniformGrid
不会为您的解决方案削减它,您可以尝试为ItemContainerStyle
设置ItemsControl
(假设您可以使用{{1}与ListBox
个孩子一起),像这样:
ListBoxItem
答案 1 :(得分:0)
我终于使用Grid
让它工作了。我不得不做一些重要的代码隐藏,由于三重布局,界面明显缓慢,但它的工作原理。欢迎提出改善建议。将此控件插入窗口时,请在StartDate
属性之前将EndDate
属性更改为其默认值;否则VS会锁定。
XAML
<UserControl x:Class="MyProject.DateTape"
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"
xmlns:my="clr-namespace:MyProject"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
mc:Ignorable="d"
d:DesignHeight="45" d:DesignWidth="188">
<UserControl.Resources>
<Thickness x:Key="bottomThickness" Bottom="1" Top="1" Left="0.5" Right="0.5" />
<Thickness x:Key="topThickness" Bottom="0" Top="1" Left="0.5" Right="0.5" />
<Style TargetType="Border">
<Setter Property="BorderBrush" Value="#FFBEBEBE"/>
</Style>
<Style TargetType="TextBlock">
<Setter Property="TextAlignment" Value="Center"/>
<Setter Property="Margin" Value="6,0"/>
</Style>
</UserControl.Resources>
<Grid x:Name="mainGrid"/>
</UserControl>
C#
public partial class DateTape : UserControl
{
public static readonly DependencyProperty StartDateProperty =
DependencyProperty.Register("StartDate", typeof(DateTime), typeof(DateTape),
new PropertyMetadata(new PropertyChangedCallback(OnDatesChanged)));
public static readonly DependencyProperty EndDateProperty =
DependencyProperty.Register("EndDate", typeof(DateTime), typeof(DateTape),
new PropertyMetadata(new PropertyChangedCallback(OnDatesChanged)));
[Category("Common"),
TypeConverter(typeof(DateConverter))]
public DateTime StartDate
{
get { return (DateTime)GetValue(StartDateProperty); }
set { SetValue(StartDateProperty, value); }
}
[Category("Common"),
TypeConverter(typeof(DateConverter))]
public DateTime EndDate
{
get { return (DateTime)GetValue(EndDateProperty); }
set { SetValue(EndDateProperty, value); }
}
public DateTape()
{
InitializeComponent();
}
private void Layout()
{
int dayCount = (EndDate - StartDate).Days;
double max = 0;
DateTime current = StartDate;
ColumnDefinition columnDefinition;
Border border;
TextBlock textBlock;
Binding binding;
Size infinity = new Size(double.PositiveInfinity, double.PositiveInfinity);
Thickness bottomThickness = (Thickness)Resources["bottomThickness"],
topThickness = (Thickness)Resources["topThickness"];
mainGrid.ColumnDefinitions.Clear();
for (int i = 0; i <= dayCount; i++, current += TimeSpan.FromDays(1))
{
mainGrid.ColumnDefinitions.Add(columnDefinition = new ColumnDefinition());
// Add a day
border = new Border();
textBlock = new TextBlock();
textBlock.Text = current.Day.ToString();
border.Child = textBlock;
binding = new Binding();
binding.Source = bottomThickness;
border.SetBinding(Border.BorderThicknessProperty, binding);
mainGrid.Children.Add(border);
border.Measure(infinity);
max = Math.Max(max, border.DesiredSize.Width);
Grid.SetRow(border, 2);
Grid.SetColumn(border, i);
}
foreach (ColumnDefinition cd in mainGrid.ColumnDefinitions)
{
cd.MinWidth = max;
}
}
private static void OnDatesChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
(d as DateTape).Layout();
}
编辑:
我找到了一种方法,在不使用多个布局过程的情况下,通过查询每个边框项的DesiredSize,我将它们添加到网格并跟踪最大宽度。