wpf 如何自动缩放一组控件的字体大小？
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原文地址: http://stackoverflow.com/questions/15641473/
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StackOverFlow
How to automatically scale font size for a group of controls?
提问by Alan
I have a few TextBlocks in WPF in a Grid that I would like to scale depending on their available width / height. When I searched for automatically scaling Font size the typical suggestion is to put the TextBlock into a ViewBox.
我在网格中的 WPF 中有一些 TextBlock，我想根据它们的可用宽度/高度进行缩放。当我搜索自动缩放字体大小时，典型的建议是将 TextBlock 放入 ViewBox。
So I did this:
所以我这样做了：
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Viewbox MaxHeight="18" Grid.Column="0" Stretch="Uniform" Margin="5" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<TextBlock Text="{Binding Text1}" />
</Viewbox>
<Viewbox MaxHeight="18" Grid.Column="1" Stretch="Uniform" Margin="5" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<TextBlock Text="{Binding Text2}" />
</Viewbox>
<Viewbox MaxHeight="18" Grid.Column="2" Stretch="Uniform" Margin="5" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<TextBlock Text="{Binding Text3}" />
</Viewbox>
</Grid>
And it scales the font for each TextBlock automatically. However, this looks funny because if one of the TextBlocks has longer text then it will be in a smaller font while it's neighboring grid elements will be in a larger font. I want the Font size to scale by group, perhaps it would be nice if I could specify a "SharedSizeGroup" for a set of controls to auto size their font.
它会自动缩放每个 TextBlock 的字体。然而，这看起来很有趣，因为如果其中一个 TextBlocks 有更长的文本，那么它将使用较小的字体，而它的相邻网格元素将使用较大的字体。我希望字体大小按组缩放，如果我可以为一组控件指定一个“SharedSizeGroup”来自动调整它们的字体大小，那可能会很好。
e.g.
例如
The first text blocks text might be "3/26/2013 10:45:30 AM", and the second TextBlocks text might say "FileName.ext". If these are across the width of a window, and the user begins resizing the window smaller and smaller. The date will start making its font smaller than the file name, depending on the length of the file name.
第一个文本块文本可能是“3/26/2013 10:45:30 AM”，第二个文本块文本可能是“FileName.ext”。如果这些跨窗口的宽度，并且用户开始将窗口的大小调整得越来越小。日期将开始使其字体小于文件名，具体取决于文件名的长度。
Ideally, once one of the text fields starts to resize the font point size, they would all match. Has anyone came up with a solution for this or can give me a shot at how you would make it work? If it requires custom code then hopefully we / I could repackage it into a custom Blend or Attached Behavior so that is re-usable for the future. I think it is a pretty general problem, but I wasn't able to find anything on it by searching.
理想情况下，一旦文本字段之一开始调整字体点大小，它们都会匹配。有没有人想出一个解决方案，或者可以给我一个你将如何使它工作的机会？如果它需要自定义代码，那么希望我们/我可以将其重新打包为自定义混合或附加行为，以便将来可以重复使用。我认为这是一个非常普遍的问题，但我无法通过搜索找到任何内容。
UpdateI tried Mathieu's suggestion and it sort of works, but it has some side-effects:
更新我尝试了 Mathieu 的建议并且它有点工作，但它有一些副作用：
<Window x:Class="WpfApplication6.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="270" Width="522">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Rectangle Grid.Row="0" Fill="SkyBlue" />
<Viewbox Grid.Row="1" MaxHeight="30" Stretch="Uniform" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" >
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" SharedSizeGroup="col"/>
<ColumnDefinition Width="Auto" SharedSizeGroup="col"/>
<ColumnDefinition Width="Auto" SharedSizeGroup="col"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Text="SomeLongText" Margin="5" />
<TextBlock Grid.Column="1" Text="TextA" Margin="5" />
<TextBlock Grid.Column="2" Text="TextB" Margin="5" />
</Grid>
</Viewbox>
</Grid>
</Window>
Honestly, missing hte proportional columns is probably fine with me. I wouldn't mind it AutoSizing the columns to make smart use of the space, but it has to span the entire width of the window.
老实说，缺少比例列对我来说可能没问题。我不介意自动调整列的大小以巧妙地利用空间，但它必须跨越窗口的整个宽度。
Notice without maxsize, in this extended example the text is too large:
注意没有 maxsize，在这个扩展示例中，文本太大：
<Window x:Class="WpfApplication6.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="270" Width="522">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Rectangle Grid.Row="0" Fill="SkyBlue" />
<Viewbox Grid.Row="1" Stretch="Uniform" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" >
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" SharedSizeGroup="col"/>
<ColumnDefinition Width="Auto" SharedSizeGroup="col"/>
<ColumnDefinition Width="Auto" SharedSizeGroup="col"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Text="SomeLongText" Margin="5" />
<TextBlock Grid.Column="1" Text="TextA" Margin="5" />
<TextBlock Grid.Column="2" Text="TextB" Margin="5" />
</Grid>
</Viewbox>
</Grid>
Here, I would want to limit how big the font can get, so it doesn't waste vertical window real estate. I'm expecting the output to be aligned left, center, and right with the Font being as big as possible up to the desired maximum size.
在这里，我想限制字体可以有多大，这样它就不会浪费垂直窗口的空间。我希望输出左、中和右对齐，字体尽可能大，直到所需的最大尺寸。
@adabyron
@adabyron
The solution you propose is not bad (And is the best yet) but it does have some limitations. For example, initially I wanted my columns to be proportional (2nd one should be centered). For example, my TextBlocks might be labeling the start, center, and stop of a graphwhere alignment matters.
您提出的解决方案还不错（并且是最好的），但它确实有一些限制。例如，最初我希望我的列成比例（第二个应该居中）。例如，我的 TextBlocks 可能标记图形的开始、中心和停止，其中对齐很重要。
<Window x:Class="WpfApplication6.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:b="clr-namespace:WpfApplication6.Behavior"
Title="MainWindow" Height="350" Width="525">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Rectangle Grid.Row="0" Fill="SkyBlue" />
<Line X1="0.5" X2="0.5" Y1="0" Y2="1" Stretch="Fill" StrokeThickness="3" Stroke="Red" />
<Grid Grid.Row="1">
<i:Interaction.Behaviors>
<b:MoveToViewboxBehavior />
</i:Interaction.Behaviors>
<Viewbox Stretch="Uniform" />
<ContentPresenter >
<ContentPresenter.Content>
<Grid x:Name="TextBlockContainer">
<Grid.Resources>
<Style TargetType="TextBlock" >
<Setter Property="FontSize" Value="16" />
<Setter Property="Margin" Value="5" />
</Style>
</Grid.Resources>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Text="SomeLongText" VerticalAlignment="Center" HorizontalAlignment="Center" />
<TextBlock Grid.Column="2" Text="TextA" HorizontalAlignment="Center" VerticalAlignment="Center" />
<TextBlock Grid.Column="4" Text="TextB" HorizontalAlignment="Center" VerticalAlignment="Center" />
</Grid>
</ContentPresenter.Content>
</ContentPresenter>
</Grid>
</Grid>
</Window>
And here is the result. Notice it does not know that it is getting clipped early on, and then when it substitutes ViewBox it looks as if the Grid defaults to column size "Auto" and no longer aligns center.
这是结果。请注意，它不知道它很早就被剪裁了，然后当它替换 ViewBox 时，它看起来好像 Grid 默认为列大小“自动”并且不再居中对齐。
采纳答案by Mike Fuchs
I wanted to edit the answer I had already offered, but then decided it makes more sense to post a new one, because it really depends on the requirements which one I'd prefer. This here probably fits Alan's idea better, because
我想编辑我已经提供的答案，但后来决定发布一个新答案更有意义，因为这实际上取决于我更喜欢哪个要求。这可能更符合 Alan 的想法，因为
- The middle textblock stays in the middle of the window
- Fontsize adjustment due to height clipping is accomodated
- Quite a bit more generic
- No viewbox involved
- 中间的文本块停留在窗口的中间
- 由于高度剪裁而调整字体大小
- 比较一般
- 不涉及视窗
The other onehas the advantage that
在另一个的优点是
- Space for the textblocks is allocated more efficiently (no unnecessary margins)
- Textblocks may have different fontsizes
- 更有效地分配文本块的空间（没有不必要的边距）
- 文本块可能有不同的字体大小
I tested this solution also in a top container of type StackPanel/DockPanel, behaved decently.
我也在 StackPanel/DockPanel 类型的顶级容器中测试了这个解决方案，表现得很好。
Note that by playing around with the column/row widths/heights (auto/starsized), you can get different behaviors. So it would also be possible to have all three textblock columns starsized, but that means width clipping does occur earlier and there is more margin. Or if the row the grid resides in is auto sized, height clipping will never occur.
请注意，通过调整列/行的宽度/高度（自动/星号），您可以获得不同的行为。因此，也可以将所有三个 textblock 列都设置为星星大小，但这意味着宽度裁剪确实发生得更早，并且有更多的边距。或者，如果网格所在的行是自动调整大小的，则永远不会发生高度裁剪。
Xaml:
Xml：
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:beh="clr-namespace:WpfApplication1.Behavior"
Title="MainWindow" Height="350" Width="525">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="0.9*"/>
<RowDefinition Height="0.1*" />
</Grid.RowDefinitions>
<Rectangle Fill="DarkOrange" />
<Grid x:Name="TextBlockContainer" Grid.Row="1" >
<i:Interaction.Behaviors>
<beh:ScaleFontBehavior MaxFontSize="32" />
</i:Interaction.Behaviors>
<Grid.Resources>
<Style TargetType="TextBlock" >
<Setter Property="Margin" Value="5" />
<Setter Property="VerticalAlignment" Value="Center" />
</Style>
</Grid.Resources>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Text="SomeLongText" />
<TextBlock Grid.Column="1" Text="TextA" HorizontalAlignment="Center" />
<TextBlock Grid.Column="2" Text="TextB" HorizontalAlignment="Right" />
</Grid>
</Grid>
</Window>
ScaleFontBehavior:
ScaleFontBehavior：
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Interactivity;
using System.Windows.Media;
using WpfApplication1.Helpers;
namespace WpfApplication1.Behavior
{
public class ScaleFontBehavior : Behavior<Grid>
{
// MaxFontSize
public double MaxFontSize { get { return (double)GetValue(MaxFontSizeProperty); } set { SetValue(MaxFontSizeProperty, value); } }
public static readonly DependencyProperty MaxFontSizeProperty = DependencyProperty.Register("MaxFontSize", typeof(double), typeof(ScaleFontBehavior), new PropertyMetadata(20d));
protected override void OnAttached()
{
this.AssociatedObject.SizeChanged += (s, e) => { CalculateFontSize(); };
}
private void CalculateFontSize()
{
double fontSize = this.MaxFontSize;
List<TextBlock> tbs = VisualHelper.FindVisualChildren<TextBlock>(this.AssociatedObject);
// get grid height (if limited)
double gridHeight = double.MaxValue;
Grid parentGrid = VisualHelper.FindUpVisualTree<Grid>(this.AssociatedObject.Parent);
if (parentGrid != null)
{
RowDefinition row = parentGrid.RowDefinitions[Grid.GetRow(this.AssociatedObject)];
gridHeight = row.Height == GridLength.Auto ? double.MaxValue : this.AssociatedObject.ActualHeight;
}
foreach (var tb in tbs)
{
// get desired size with fontsize = MaxFontSize
Size desiredSize = MeasureText(tb);
double widthMargins = tb.Margin.Left + tb.Margin.Right;
double heightMargins = tb.Margin.Top + tb.Margin.Bottom;
double desiredHeight = desiredSize.Height + heightMargins;
double desiredWidth = desiredSize.Width + widthMargins;
// adjust fontsize if text would be clipped vertically
if (gridHeight < desiredHeight)
{
double factor = (desiredHeight - heightMargins) / (this.AssociatedObject.ActualHeight - heightMargins);
fontSize = Math.Min(fontSize, MaxFontSize / factor);
}
// get column width (if limited)
ColumnDefinition col = this.AssociatedObject.ColumnDefinitions[Grid.GetColumn(tb)];
double colWidth = col.Width == GridLength.Auto ? double.MaxValue : col.ActualWidth;
// adjust fontsize if text would be clipped horizontally
if (colWidth < desiredWidth)
{
double factor = (desiredWidth - widthMargins) / (col.ActualWidth - widthMargins);
fontSize = Math.Min(fontSize, MaxFontSize / factor);
}
}
// apply fontsize (always equal fontsizes)
foreach (var tb in tbs)
{
tb.FontSize = fontSize;
}
}
// Measures text size of textblock
private Size MeasureText(TextBlock tb)
{
var formattedText = new FormattedText(tb.Text, CultureInfo.CurrentUICulture,
FlowDirection.LeftToRight,
new Typeface(tb.FontFamily, tb.FontStyle, tb.FontWeight, tb.FontStretch),
this.MaxFontSize, Brushes.Black); // always uses MaxFontSize for desiredSize
return new Size(formattedText.Width, formattedText.Height);
}
}
}
VisualHelper:
视觉助手：
public static List<T> FindVisualChildren<T>(DependencyObject obj) where T : DependencyObject
{
List<T> children = new List<T>();
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
{
var o = VisualTreeHelper.GetChild(obj, i);
if (o != null)
{
if (o is T)
children.Add((T)o);
children.AddRange(FindVisualChildren<T>(o)); // recursive
}
}
return children;
}
public static T FindUpVisualTree<T>(DependencyObject initial) where T : DependencyObject
{
DependencyObject current = initial;
while (current != null && current.GetType() != typeof(T))
{
current = VisualTreeHelper.GetParent(current);
}
return current as T;
}
回答by mathieu
Put your grid in the ViewBox, which will scale the whole Grid :
将您的网格放在 ViewBox 中，这将缩放整个 Grid ：
<Viewbox Stretch="Uniform" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Text="{Binding Text1}" Margin="5" />
<TextBlock Grid.Column="1" Text="{Binding Text2}" Margin="5" />
<TextBlock Grid.Column="2" Text="{Binding Text3}" Margin="5" />
</Grid>
</Viewbox>
回答by Akku
I think I know the way to go and will leave the rest to you. In this example, I bound the FontSize to the ActualHeight of the TextBlock, using a converter (the converter is below):
我想我知道要走的路，剩下的就交给你了。在本例中，我使用转换器（转换器如下）将 FontSize 绑定到 TextBlock 的 ActualHeight：
<Window x:Class="MyNamespace.Test"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:Converters="clr-namespace:UpdateYeti.Converters"
Title="Test" Height="570" Width="522">
<Grid Height="370" Width="522">
<Grid.Resources>
<Converters:HeightToFontSizeConverter x:Key="conv" />
</Grid.Resources>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Rectangle Grid.Row="0" Fill="SkyBlue" />
<Grid Grid.Row="1" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" MinHeight="60" Background="Beige">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Text="SomeLongText" Margin="5"
FontSize="{Binding RelativeSource={RelativeSource Self}, Path=ActualHeight, Converter={StaticResource conv}}" />
<TextBlock Grid.Column="1" Text="TextA" Margin="5" HorizontalAlignment="Center"
FontSize="{Binding RelativeSource={RelativeSource Self}, Path=ActualHeight, Converter={StaticResource conv}}" />
<TextBlock Grid.Column="2" Text="TextB" Margin="5" FontSize="{Binding RelativeSource={RelativeSource Self}, Path=ActualHeight, Converter={StaticResource conv}}" />
</Grid>
</Grid>
</Window>
[ValueConversion(typeof(double), typeof(double))]
class HeightToFontSizeConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
// here you can use the parameter that you can give in here via setting , ConverterParameter='something'} or use any nice login with the VisualTreeHelper to make a better return value, or maybe even just hardcode some max values if you like
var height = (double)value;
return .65 * height;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
回答by Mike Fuchs
General remark: A possible alternative to the whole text scaling could be to just use TextTrimming on the TextBlocks.
一般备注：整个文本缩放的一种可能替代方法是仅在 TextBlocks 上使用 TextTrimming。
I've struggled to find a solution to this one. Using a viewbox is really hard to mix with any layout adjustments. Worst of all, ActualWidth etc. do not change inside a viewbox. So I finally decided to use the viewbox only if absolutely necessary, which is when clipping would occur. I'm therefore moving the content between a ContentPresenter and a Viewbox, depending upon the available space.
我一直在努力寻找解决方案。使用视图框很难与任何布局调整混合使用。最糟糕的是，ActualWidth 等不会在视图框内改变。所以我最终决定只在绝对必要时才使用视图框，也就是在剪裁发生的时候。因此，我根据可用空间在 ContentPresenter 和 Viewbox 之间移动内容。
This solution is not as generic as I would like, mainly the MoveToViewboxBehavior does assume it is attached to a grid with the following structure. If that cannot be accomodated, the behavior will most likely have to be adjusted. Creating a usercontrol and denoting the necessary parts (PART_...) might be a valid alternative.
这个解决方案不像我想要的那么通用，主要是 MoveToViewboxBehavior 确实假设它附加到具有以下结构的网格。如果不能适应，则很可能必须调整行为。创建用户控件并表示必要的部分 (PART_...) 可能是一个有效的替代方法。
Note that I have extended the grid's columns from three to five, because that makes the solution a lot easier. It means that the middle textblock will not be exactly in the middle, in the sense of absolute coordinates, instead it is centered between the textblocks to the left and right.
请注意，我已将网格的列从 3 列扩展到 5 列，因为这使解决方案更容易。这意味着中间的文本块在绝对坐标的意义上不会正好在中间，而是在左右文本块之间居中。
<Grid > <!-- MoveToViewboxBehavior attached to this grid -->
<Viewbox />
<ContentPresenter>
<ContentPresenter.Content>
<Grid x:Name="TextBlockContainer">
<TextBlocks ... />
</Grid>
</ContentPresenter.Content>
</ContentPresenter>
</Grid>
Xaml:
Xml：
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:beh="clr-namespace:WpfApplication1.Behavior"
Title="MainWindow" Height="350" Width="525">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Rectangle Grid.Row="0" Fill="SkyBlue" />
<Grid Grid.Row="1">
<i:Interaction.Behaviors>
<beh:MoveToViewboxBehavior />
</i:Interaction.Behaviors>
<Viewbox Stretch="Uniform" />
<ContentPresenter >
<ContentPresenter.Content>
<Grid x:Name="TextBlockContainer">
<Grid.Resources>
<Style TargetType="TextBlock" >
<Setter Property="FontSize" Value="16" />
<Setter Property="Margin" Value="5" />
</Style>
</Grid.Resources>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Text="SomeLongText" />
<TextBlock Grid.Column="2" Text="TextA" />
<TextBlock Grid.Column="4" Text="TextB" />
</Grid>
</ContentPresenter.Content>
</ContentPresenter>
</Grid>
</Grid>
</Window>
MoveToViewBoxBehavior:
MoveToViewBox 行为：
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Interactivity;
using System.Windows.Media;
using WpfApplication1.Helpers;
namespace WpfApplication1.Behavior
{
public class MoveToViewboxBehavior : Behavior<Grid>
{
// IsClipped
public bool IsClipped { get { return (bool)GetValue(IsClippedProperty); } set { SetValue(IsClippedProperty, value); } }
public static readonly DependencyProperty IsClippedProperty = DependencyProperty.Register("IsClipped", typeof(bool), typeof(MoveToViewboxBehavior), new PropertyMetadata(false, OnIsClippedChanged));
private static void OnIsClippedChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
var beh = (MoveToViewboxBehavior)sender;
Grid grid = beh.AssociatedObject;
Viewbox vb = VisualHelper.FindVisualChild<Viewbox>(grid);
ContentPresenter cp = VisualHelper.FindVisualChild<ContentPresenter>(grid);
if ((bool)e.NewValue)
{
// is clipped, so move content to Viewbox
UIElement element = cp.Content as UIElement;
cp.Content = null;
vb.Child = element;
}
else
{
// can be shown without clipping, so move content to ContentPresenter
cp.Content = vb.Child;
vb.Child = null;
}
}
protected override void OnAttached()
{
this.AssociatedObject.SizeChanged += (s, e) => { IsClipped = CalculateIsClipped(); };
}
// Determines if the width of all textblocks within TextBlockContainer (using MaxFontSize) are wider than the AssociatedObject grid
private bool CalculateIsClipped()
{
double totalDesiredWidth = 0d;
Grid grid = VisualHelper.FindVisualChildByName<Grid>(this.AssociatedObject, "TextBlockContainer");
List<TextBlock> tbs = VisualHelper.FindVisualChildren<TextBlock>(grid);
foreach (var tb in tbs)
{
if (tb.TextWrapping != TextWrapping.NoWrap)
return false;
totalDesiredWidth += MeasureText(tb).Width + tb.Margin.Left + tb.Margin.Right + tb.Padding.Left + tb.Padding.Right;
}
return Math.Round(this.AssociatedObject.ActualWidth, 5) < Math.Round(totalDesiredWidth, 5);
}
// Measures text size of textblock
private Size MeasureText(TextBlock tb)
{
var formattedText = new FormattedText(tb.Text, CultureInfo.CurrentUICulture,
FlowDirection.LeftToRight,
new Typeface(tb.FontFamily, tb.FontStyle, tb.FontWeight, tb.FontStretch),
tb.FontSize, Brushes.Black);
return new Size(formattedText.Width, formattedText.Height);
}
}
}
VisualHelper:
视觉助手：
public static class VisualHelper
{
public static T FindVisualChild<T>(DependencyObject obj) where T : DependencyObject
{
T child = null;
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
{
var o = VisualTreeHelper.GetChild(obj, i);
if (o != null)
{
child = o as T;
if (child != null) break;
else
{
child = FindVisualChild<T>(o); // recursive
if (child != null) break;
}
}
}
return child;
}
public static List<T> FindVisualChildren<T>(DependencyObject obj) where T : DependencyObject
{
List<T> children = new List<T>();
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
{
var o = VisualTreeHelper.GetChild(obj, i);
if (o != null)
{
if (o is T)
children.Add((T)o);
children.AddRange(FindVisualChildren<T>(o)); // recursive
}
}
return children;
}
public static T FindVisualChildByName<T>(DependencyObject parent, string name) where T : FrameworkElement
{
T child = default(T);
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++)
{
var o = VisualTreeHelper.GetChild(parent, i);
if (o != null)
{
child = o as T;
if (child != null && child.Name == name)
break;
else
child = FindVisualChildByName<T>(o, name);
if (child != null) break;
}
}
return child;
}
}
回答by Tempeck
You can use a hidden ItemsControl in a ViewBox.
您可以在 ViewBox 中使用隐藏的 ItemsControl。
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Viewbox VerticalAlignment="Bottom">
<Grid>
<TextBlock Text="SomeLongText"/>
<ItemsControl Visibility="Hidden">
<ItemsPanelTemplate>
<Grid/>
</ItemsPanelTemplate>
<TextBlock Text="SomeLongText"/>
<TextBlock Text="TextA"/>
<TextBlock Text="TextB"/>
</ItemsControl>
</Grid>
</Viewbox>
<Viewbox Grid.Column="1" VerticalAlignment="Bottom">
<Grid>
<TextBlock Text="TextA"/>
<ItemsControl Visibility="Hidden">
<ItemsPanelTemplate>
<Grid/>
</ItemsPanelTemplate>
<TextBlock Text="SomeLongText"/>
<TextBlock Text="TextA"/>
<TextBlock Text="TextB"/>
</ItemsControl>
</Grid>
</Viewbox>
<Viewbox Grid.Column="2" VerticalAlignment="Bottom">
<Grid>
<TextBlock Text="TextB"/>
<ItemsControl Visibility="Hidden">
<ItemsPanelTemplate>
<Grid/>
</ItemsPanelTemplate>
<TextBlock Text="SomeLongText"/>
<TextBlock Text="TextA"/>
<TextBlock Text="TextB"/>
</ItemsControl>
</Grid>
</Viewbox>
</Grid>
or
或者
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Viewbox VerticalAlignment="Bottom">
<Grid>
<TextBlock Text="{Binding Text1}"/>
<ItemsControl Visibility="Hidden" ItemsSource="{Binding AllText}">
<ItemsPanelTemplate>
<Grid/>
</ItemsPanelTemplate>
<ItemsControl.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding}"/>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</Grid>
</Viewbox>
<Viewbox Grid.Column="1" VerticalAlignment="Bottom">
<Grid>
<TextBlock Text="{Binding Text2}"/>
<ItemsControl Visibility="Hidden" ItemsSource="{Binding AllText}">
<ItemsPanelTemplate>
<Grid/>
</ItemsPanelTemplate>
<ItemsControl.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding}"/>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</Grid>
</Viewbox>
<Viewbox Grid.Column="2" VerticalAlignment="Bottom">
<Grid>
<TextBlock Text="{Binding Text3}"/>
<ItemsControl Visibility="Hidden" ItemsSource="{Binding AllText}">
<ItemsPanelTemplate>
<Grid/>
</ItemsPanelTemplate>
<ItemsControl.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding}"/>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</Grid>
</Viewbox>
</Grid>
回答by Javert
A solution could be something like that :
解决方案可能是这样的：
Choose a maxFontSize, then define the appropriate FontSize to be displayed considering the current Window by using a linear equation. Window's height or width would limit the final FontSize choice.
选择 maxFontSize，然后使用线性方程定义考虑当前窗口的适当 FontSize。窗口的高度或宽度将限制最终的 FontSize 选择。
Let's take the case of a "single kind TextBlock" for the whole grid :
让我们以整个网格的“单一类型 TextBlock”为例：
Window.Current.SizeChanged += (sender, args) =>
{
int minFontSize = a;
int maxFontSize = b;
int maxMinFontSizeDiff = maxFontSize - minFontSize;
int gridMinHeight = c;
int gridMaxHeight = d;
int gridMaxMinHeightDiff = gridMaxHeight - gridMinHeight;
int gridMinWidth = e;
int gridMaxWidth = f;
int gridMaxMinHeightDiff = gridMaxWidth - gridMaxWidth;
//Linear equation considering "max/min FontSize" and "max/min GridHeight/GridWidth"
double heightFontSizeDouble = (maxMinFontSizeDiff / gridMaxMinHeightDiff ) * Grid.ActualHeight + (maxFontSize - (gridMaxHeight * (maxMinFontSizeDiff / gridMaxMinHeightDiff)))
double widthFontSizeDouble = (maxMinFontSizeDiff / gridMaxMinWidthDiff ) * Grid.ActualWidth + (maxFontSize - (gridMaxWidth * (maxMinFontSizeDiff / gridMaxMinWidthDiff)))
int heightFontSize = (int)Math.Round(heightFontSizeDouble)
int widthFontSize = (int)Math.Round(widthFontSizeDouble)
foreach (var children in Grid.Children)
{
(children as TextBlock).FontSize = Math.Min(heightFontSize, widthFontSize);
}
}
