C# 如何在Xaml中使用折叠控件调整UI?
我的项目是WP8.1,我正在使用Silverlight。 在这个项目中,我有两个矩形,一个蓝色的和一个红色的。我希望每一个都占屏幕宽度的50%,所以我做了如下:C# 如何在Xaml中使用折叠控件调整UI?,c#,xaml,windows-phone-8,C#,Xaml,Windows Phone 8,我的项目是WP8.1,我正在使用Silverlight。 在这个项目中,我有两个矩形,一个蓝色的和一个红色的。我希望每一个都占屏幕宽度的50%,所以我做了如下: <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="*" /> <ColumnDefinition Width="*" /> </Grid.ColumnDefinitions
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Rectangle Grid.Column="0" Fill="Blue" Visibility="{Binding BlueRectVisibility}" />
<Rectangle Grid.Column="1" Fill="Red" Visibility="{Binding RedRectVisibility}"/>
</Grid>
有时,其中一个矩形可以通过绑定将其可见性设置为折叠。我想要的是另一个占据所有宽度。
使用该Xaml,可见矩形只占屏幕的一半
将ColumnDefinitions更改为Auto不起作用,因为网格不再占据100%的屏幕宽度
你能解释一下如何创建一个“动态”用户界面吗?我认为问题的根源在于你将网格的列定义为50%,所以一旦建立了这个值,那么改变矩形的可见性将不会有任何区别。我使用WPF制作了这个小POC(不确定是否所有命令都转换为Silverlight,但您可以试试)。基本上,我专注于搞乱列的宽度,而不是矩形的可见性 在xaml文件中:
<Window x:Class="CollapsibleRegion.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:CollapsibleRegion"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525">
<Window.InputBindings>
<KeyBinding Modifiers="Ctrl" Key="B" Command="{Binding ToggleWidthCommand}" CommandParameter="Blue"/>
<KeyBinding Modifiers="Ctrl" Key="R" Command="{Binding ToggleWidthCommand}" CommandParameter="Red"/>
</Window.InputBindings>
<Grid>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition x:Name="blueColumn" Width="{Binding BlueColumnWidth}" />
<ColumnDefinition x:Name="redColumn" Width="{Binding RedColumnWidth}" />
</Grid.ColumnDefinitions>
<Rectangle Grid.Column="0" Fill="Blue" />
<Rectangle Grid.Column="1" Fill="Red" />
</Grid>
</Grid>
</Window>
最后,对于ToggleWidthCommand.cs,添加以下内容:
public class ToggleWidthCommand : ICommand
{
private MainWindow parent;
public ToggleWidthCommand(MainWindow parent)
{
this.parent = parent;
}
public event EventHandler CanExecuteChanged;
public bool CanExecute(object parameter)
{
return true;
}
public void Execute(object parameter)
{
var blueOrRed = (string)parameter;
if (blueOrRed == "Blue")
{
if (this.parent.BlueColumnWidth.Value == 0)
this.parent.BlueColumnWidth = new System.Windows.GridLength(5, System.Windows.GridUnitType.Star);
else
this.parent.BlueColumnWidth = new System.Windows.GridLength(0, System.Windows.GridUnitType.Pixel);
}
if (blueOrRed == "Red")
{
if (this.parent.RedColumnWidth.Value == 0)
this.parent.RedColumnWidth = new System.Windows.GridLength(5, System.Windows.GridUnitType.Star);
else
this.parent.RedColumnWidth = new System.Windows.GridLength(0, System.Windows.GridUnitType.Pixel);
}
}
}
这只是一个概念证明,显然有更有效/更干净/可扩展的方法来实现此行为,但我只是尝试快速做出响应,向您展示如何实现此行为。希望它对你有用 自动不起作用的原因是布局如下所示:
页面
:嘿网格
,你想要多大网格
:Dunno,让我问列定义
。你想要多大列定义
:哎呀,我不确定;我需要询问矩形
。嘿矩形
,您需要多少空间Rectange
:呃,我真的不在乎李>
ColumnDefinition
:然后为零李>
<StackPanel>
<Grid Height="100">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="{Binding FirstColumnWidth}" />
<ColumnDefinition Width="{Binding SecondColumnWidth}"/>
</Grid.ColumnDefinitions>
<Rectangle VerticalAlignment="Stretch"
HorizontalAlignment="Stretch" Fill="Blue" />
<Rectangle VerticalAlignment="Stretch"
HorizontalAlignment="Stretch" Fill="Red" Grid.Column="1"/>
</Grid>
<Button Content="toggle column width" Click="ToggleColWidth"/>
</StackPanel>
使用这种方法,您甚至不需要更改矩形的可见性
<StackPanel>
<Grid Height="100">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="{Binding FirstColumnWidth}" />
<ColumnDefinition Width="{Binding SecondColumnWidth}"/>
</Grid.ColumnDefinitions>
<Rectangle VerticalAlignment="Stretch"
HorizontalAlignment="Stretch" Fill="Blue" />
<Rectangle VerticalAlignment="Stretch"
HorizontalAlignment="Stretch" Fill="Red" Grid.Column="1"/>
</Grid>
<Button Content="toggle column width" Click="ToggleColWidth"/>
</StackPanel>
public partial class MainPage : PhoneApplicationPage, INotifyPropertyChanged
{
GridLength firstWidth;
GridLength secondWidth;
public MainPage()
{
firstWidth = secondWidth = new GridLength(1, GridUnitType.Star);
DataContext = this;
InitializeComponent();
}
void RaisePropertyChanged([CallerMemberName] string name = "")
{
var handler = PropertyChanged;
if (handler != null)
handler(this, new PropertyChangedEventArgs(name));
}
public event PropertyChangedEventHandler PropertyChanged;
public GridLength FirstColumnWidth
{
get { return firstWidth; }
set { firstWidth = value; RaisePropertyChanged(); }
}
public GridLength SecondColumnWidth
{
get { return secondWidth; }
set { secondWidth = value; RaisePropertyChanged(); }
}
private void ToggleColWidth(object sender, RoutedEventArgs e)
{
if (FirstColumnWidth.GridUnitType == GridUnitType.Star)
{
FirstColumnWidth = new GridLength(0, GridUnitType.Pixel);
SecondColumnWidth = new GridLength(1, GridUnitType.Star);
}
else
{
FirstColumnWidth = SecondColumnWidth = new GridLength(1, GridUnitType.Star);
}
}
}