WPF ToolTip样式与动态LayoutTransform [英] WPF ToolTip Style with dynamic LayoutTransform

问题描述

我有一个可以缩放UI的应用程序，我想用它扩展工具提示。
我试过这样做：

 < Style TargetType ={x：Type ToolTip}> 
< Setter Property =LayoutTransformValue ={DynamicResource scaleTransf}/> 
 ... 
< / Style> 
  

...其中 scaleTransf 是一个资源我通过代码更改：

  Application.Current.Resources [scaleTransf] = new ScaleTransform（...）; 
  

with：

 code>< ScaleTransform x：Key =scaleTransfScaleX =1ScaleY =1/> 
  

大多数工具提示符的大小可以缩放，但是其中一些是由C＃代码创建的，得到比例。我已经检查，似乎我没有通过代码设置他们的Style或LayoutTransform，所以我真的不明白是什么问题...而且，我有一个印象，上面的XAML代码工作几天前。 ：（

我可以做些什么来让所有的时间都没有在代码隐藏中设置LayoutTransform吗？

$ b $

编辑： 如果我将每个 ToolTip 实例的 LayoutTransform 设置为 scaleTransf 在代码背后使用 SetResourceReference（）一切正常，我不明白为什么Style不工作，而它应该做的完全一样每个 ToolTip 被创建...根据我对WPF的有限知识我会称之为一个BUG！

---

EDIT2：

我也尝试过：

  Application.Current.Resources.Remove（scaleTransf）; 
 Application.Current.Resources.Add（scaleTransf，new ScaleTransform（val，val ））; 
  

---

EDIT3：我尝试使用DependencyProperty解决这个问题：

在MainWindow.xaml.cs中：

  public static readonly DependencyProperty TransformToApplyProperty = DependencyProperty.Register（TransformToApply，typeof（Transform），typeof（MainWindow））; 
 public Transform TransformToApply 
 {
 get {return（Transform）this.GetValue（TransformToApplyProperty）; } 
} 
  

在MainWindow的某处，响应用户输入：

  this.SetValue（TransformToApplyProperty，new ScaleTransform（val，val））; 
  

XAML样式：

 < Style TargetType ={x：Type ToolTip}> 
< Setter Property =LayoutTransformValue ={Binding TransformToApply，Source = {x：Reference WndXName}}/> 
 ... 
  

使用这段代码，而不是单一的工具提示似乎可以扩展

解决方案

我不认为资源是您情况下最好的方法。

在这种情况下，将转换声明为窗口的依赖属性会更好：

  public静态只读DependencyProperty TransformToApplyProperty = DependencyProperty.Register（TransformToApply，typeof（Transform），typeof（Window））; 
  

然后在XAML中：

 < Window ....（所有xmlns）
x：Name =window/> 
< AnyControl ScaleTransform ={Binding TransformToApply，ElementName = window}/> 
< / Window> 
  

I have an app that scales it's UI and I want to scale the ToolTips with it. I have tried doing this:

<Style TargetType="{x:Type ToolTip}">
    <Setter Property="LayoutTransform" Value="{DynamicResource scaleTransf}"/>
    ...
</Style>

...where scaleTransf is a resource that I change via code:

Application.Current.Resources["scaleTransf"] = new ScaleTransform(...);

with:

<ScaleTransform x:Key="scaleTransf" ScaleX="1" ScaleY="1"/>

Most of the ToolTips do get scaled in size but some of them that are created by C# code don't get scaled. I've checked and it seems that I don't set their Style or LayoutTransform by code, so I don't really understand what is going wrong... Moreover, I have the impression that the above XAML code worked fine a few days ago. :(

Is there sth I can do to make it work all the time without setting the LayoutTransform in code-behind?

EDIT : The ToolTips that don't change scale are the ones that have become visible before.

EDIT1 : If I set the LayoutTransform of each ToolTip instance to scaleTransf in code behind using SetResourceReference() everything works fine. I don't understand why the Style doesn't work while it is supposed to do exactly the same for every ToolTip that gets created... Based on my limited knowledge of WPF I would call this a BUG!

---

EDIT2 :

I have also tried this:

Application.Current.Resources.Remove("scaleTransf");
Application.Current.Resources.Add("scaleTransf", new ScaleTransform(val, val));

---

EDIT3 : My attempt to solve this using a DependencyProperty:

In MainWindow.xaml.cs :

    public static readonly DependencyProperty TransformToApplyProperty = DependencyProperty.Register("TransformToApply", typeof(Transform), typeof(MainWindow));
    public Transform TransformToApply
    {
        get { return (Transform)this.GetValue(TransformToApplyProperty); }
    }

Somewhere in MainWindow, in response to a user input:

this.SetValue(TransformToApplyProperty, new ScaleTransform(val, val));

XAML Style:

<Style TargetType="{x:Type ToolTip}">
    <Setter Property="LayoutTransform" Value="{Binding TransformToApply, Source={x:Reference WndXName}}"/>
...

Using this code, not a single one of the ToolTips seem to scale accordingly.

解决方案

I don't think a resource is the best approach in your situation.

It would be better in this case to declare your Transform as a DependencyProperty of your window:

public static readonly DependencyProperty TransformToApplyProperty = DependencyProperty.Register("TransformToApply", typeof(Transform), typeof(Window));

then in XAML:

<Window  .... (all the xmlns)
         x:Name="window"/>
    <AnyControl ScaleTransform="{Binding TransformToApply, ElementName=window}"/>
</Window>

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