如何延迟打开WPF弹出窗口?

问题描述

我只是想打开WPF 弹出窗口有点延迟，就像工具提示.

I simply want to open up the WPF Popup with a delay, sort of like a ToolTip.

我该如何实现?

顺便说一句，Popup.PopupAnimation = PopupAnimation.Fade ...消失得太快.我想在那里呆至少半秒钟.

And, by the way, Popup.PopupAnimation = PopupAnimation.Fade ... fades in too quickly. I want at least half a second in there.

推荐答案

首先...该答案的功劳归于埃里克·伯克.他回答这个问题已经发布在WPF中门徒小组.我认为将这个答案也放到StackOverflow上很有用.

First off ... the credit for this answer goes to Eric Burke. He answered this very question posted in the WPF Disciples group. I thought it would be useful to put this answer out on StackOverflow too.

基本上，您需要使用DiscreteBooleanKeyFrame为弹出窗口的IsOpen属性设置动画.

检查以下xaml(可以轻松将其粘贴到 Kaxaml 或其他宽松的xaml编辑实用程序中):

Check out the following xaml (which can easily be pasted into Kaxaml or another loose xaml editing utility):

<Page
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
>
    <ContentPresenter>
        <ContentPresenter.ContentTemplate>
            <DataTemplate>
                <Grid>
                    <CheckBox
                        x:Name="cb"
                        Width="100"
                        Height="40"
                        Content="Hover Over Me"
                    />
                    <Popup
                        x:Name="popup"
                        Placement="Bottom"
                        PlacementTarget="{Binding ElementName=cb}"
                    >
                        <Border Width="400" Height="400" Background="Red"/>
                    </Popup>
                </Grid>
                <DataTemplate.Triggers>
                    <Trigger SourceName="cb" Property="IsMouseOver" Value="True">
                        <Trigger.EnterActions>
                            <BeginStoryboard x:Name="bsb">
                                <Storyboard>
                                    <BooleanAnimationUsingKeyFrames
                                        Storyboard.TargetName="popup"
                                        Storyboard.TargetProperty="IsOpen"
                                        FillBehavior="HoldEnd"
                                    >
                                        <DiscreteBooleanKeyFrame KeyTime="0:0:0.5" Value="True"/>
                                     </BooleanAnimationUsingKeyFrames>
                                </Storyboard>
                            </BeginStoryboard>
                        </Trigger.EnterActions>
                        <Trigger.ExitActions>
                            <StopStoryboard BeginStoryboardName="bsb"/>
                        </Trigger.ExitActions>
                    </Trigger>
                </DataTemplate.Triggers>
            </DataTemplate>
        </ContentPresenter.ContentTemplate>
    </ContentPresenter>
</Page>

请注意，我稍稍修改了他的原始解决方案...以便在鼠标悬停时触发IsOpen，而不是像检查CheckBox时那样检查CheckBox.所有尝试使Popup的行为都类似于ToolTip.

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