显式设置不透明度后，如何通过IsEnabled重置WPF控件的默认不透明度切换? [英] How to reset a WPF control's default opacity toggling via IsEnabled after setting opacity explictly?

问题描述

当我禁用控件(按钮)时，它太暗了，很难阅读文本.

When I disable a control (button), it is so dark that it is very hard to read the text.

因此，我正在使用扩展方法将不透明度设置为1.0(100％)，以便即使禁用也可以轻松阅读:

So I am using an extension method to set the opacity to 1.0 (100%) so it can be read easily, even when disabled:

public static void IsEnabledSpecial(this System.Windows.UIElement control, bool isEnabled) {
    control.IsEnabled = isEnabled;
    control.Opacity = 1.0;          // This makes a disabled control more readable
}

通常，当未为WPF控件明确设置不透明度时，启用控件时它会在1.0(100％)和禁用控件时在0.35(35％)之间切换.

Normally, when opacity is not explicitly set for a WPF control, it appears to toggle between 1.0 (100%) when the control is enabled and 0.35 (35%) when the control is disabled.

一旦我使用扩展方法明确设置不透明度，此后，当我设置IsEnabled 而没有扩展方法时，控件将停止在1.0和0.35之间切换.即使IsEnabled设置为false，它也会卡住"为1.0(100％)；

Once I explicitly set the opacity using the extension method, the control thereafter ceases to toggle between 1.0 and 0.35 when I set IsEnabled without the extension method. It gets "stuck" at 1.0 (100%), even when IsEnabled is set to false;

设置不透明度后，以后如何重置控件以使其正常不透明度在1.0到0.35之间切换?

After I set the opacity, how can I later reset the control to do its normal opacity toggling between 1.0 and 0.35?

推荐答案

Opacity的更改是通过触发器进行的.通过直接设置值，您将覆盖样式或触发器可能产生的任何值.实际上，这不是执行此类操作的方法.您应该使用自己的样式和触发器.

The changing of the Opacity is being done through triggers. By setting the value directly, you are overriding any value that may be produced by a style or triggers. This is really not the way to go about doing this sort of thing. You should be using styles and triggers of your own.

但是，您只需清除分配给Opacity的值，就可以实现所需的目标:

However, you may be able to achieve what you want simply by clearing the value that is assigned to Opacity:

control.ClearValue(UIElement.OpacityProperty);

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