[英]UWP: how to reflow controls based on grid width
我有兩個水平放置的按鈕。 它們位於網格內。 這個包含兩個按鈕的網格寬度為 370。當按鈕上的文本變大時,它需要超過 370 的寬度。所以我想要做的是,而不是水平放置,我想在文本開始時動態垂直放置它們種植。 基本上,我希望根據網格的寬度(而不是基於主窗口的寬度)在此網格內為這兩個按鈕自動重排行為。 所以我希望它們適合 370 寬度,如果它們不能,我希望它們垂直放置。 我怎樣才能做到這一點?
我探索了 GridView 但它會在 GridView 附帶的框內顯示按鈕,所以我不想要 GridView 附帶的額外 UI,除非我們可以選擇隱藏它?
我檢查了 AdaptiveTrigger 但那是基於 window 的寬度而不是控件的寬度(在這種情況下是網格)
<Grid
Grid.Row="2"
Margin="0,36,0,28"
Width="370"
HorizontalAlignment="Left"
VerticalAlignment="Bottom">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid
Grid.Column="0"
CornerRadius="3">
<Button
MinWidth="118"
MinHeight="30"
HorizontalAlignment="Left"
HorizontalContentAlignment="Center"
VerticalContentAlignment="Center"
AutomationProperties.Name="{x:Bind ViewModel.PrimaryActionAutomationName, Mode=OneWay}"
BorderThickness="1"
Click="{x:Bind ViewModel.InvokePrimaryAction}"
Content="{x:Bind ViewModel.PrimaryAction, Mode=OneWay}"
CornerRadius="3"
Style="{StaticResource AccentButtonStyle}" />
</Grid>
<Grid
Grid.Column="1"
CornerRadius="3"
Margin="32,0,0,0">
<HyperlinkButton
AutomationProperties.Name="{x:Bind ViewModel.SecondaryLinkAutomationName, Mode=OneWay}"
AutomationProperties.AutomationId="{Binding AutomationId, ConverterParameter=HyperlinkButton, Converter={StaticResource AutomationIdConverter}}"
Content="{x:Bind ViewModel.SecondaryText, Mode=OneWay}"
FontSize="14"
Margin="0,0,0,0"
Style="{StaticResource HyperlinkButtonStyle}"
NavigateUri="{x:Bind ViewModel.SecondaryLink, Mode=OneWay}" />
</Grid>
</Grid>
對於您的場景,我建議您根據StateTriggerBase
Class 自定義一個StateTrigger
來監控 Grid 的寬度並根據寬度應用視覺狀態。
我制作了一個簡單的示例,您可以參考。
控件大小觸發器:
public class ControlSizeTrigger : StateTriggerBase
{
//private variables
private double _minHeight, _minWidth = -1;
private FrameworkElement _targetElement;
private double _currentHeight, _currentWidth;
//public properties to set from XAML
public double MinHeight
{
get
{
return _minHeight;
}
set
{
_minHeight = value;
}
}
public double MinWidth
{
get
{
return _minWidth;
}
set
{
_minWidth = value;
}
}
public FrameworkElement TargetElement
{
get
{
return _targetElement;
}
set
{
if (_targetElement != null)
{
_targetElement.SizeChanged -= _targetElement_SizeChanged;
}
_targetElement = value;
_targetElement.SizeChanged += _targetElement_SizeChanged;
}
}
//Handle event to get current values
private void _targetElement_SizeChanged(object sender, SizeChangedEventArgs e)
{
_currentHeight = e.NewSize.Height;
_currentWidth = e.NewSize.Width;
UpdateTrigger();
}
//Logic to evaluate and apply trigger value
private void UpdateTrigger()
{
//if target is set and either minHeight or minWidth is set, proceed
if (_targetElement != null && (_minWidth > 0 || _minHeight > 0))
{
//if both minHeight and minWidth are set, then both conditions must be satisfied
if (_minHeight > 0 && _minWidth > 0)
{
SetActive((_currentHeight >= _minHeight) && (_currentWidth >= _minWidth));
}
//if only one of them is set, then only that condition needs to be satisfied
else if (_minHeight > 0)
{
SetActive(_currentHeight >= _minHeight);
}
else
{
SetActive(_currentWidth >= _minWidth);
bool bbb = _currentWidth >= _minWidth;
Debug.WriteLine("Widthtrigger :" + bbb);
}
}
else
{
SetActive(false);
}
}
}
主頁.xaml:
<Grid>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="ControlSizeStates">
<VisualState x:Name="SizeChange">
<VisualState.StateTriggers>
<local:ControlSizeTrigger MinWidth="800" TargetElement="{x:Bind Path=MyStackPanel}" />
<!--<AdaptiveTrigger MinWindowHeight="500" />-->
</VisualState.StateTriggers>
<VisualState.Setters>
<Setter Target="MyStackPanel.Background" Value="Red" />
<Setter Target="MyStackPanel.Orientation" Value="Horizontal" />
<Setter Target="MyButton.Foreground" Value="Black" />
</VisualState.Setters>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<StackPanel x:Name="MyStackPanel" Width="100" Height="200" Background="AliceBlue" Orientation="Vertical">
<Button x:Name="MyButton" Foreground="Red" Content="Click" Click="Button_Click"/>
<Button x:Name="MyButton2" Foreground="Red" Content="Click" />
</StackPanel>
</Grid>
主頁.cs:
public MainPage()
{
this.InitializeComponent();
}
private void Button_Click(object sender, RoutedEventArgs e)
{
MyStackPanel.Width = 1100;
}
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