WPF实现TextBlock呼吸灯效果

                            <textblock text="录像中" fontsize="48" foreground="#ed4646" horizontalalignment="center" fontweight="medium" x:name="textblockrecording">
                                <textblock.triggers>
                                    <eventtrigger routedevent="frameworkelement.loaded">
                                        <beginstoryboard>
                                            <storyboard begintime="0:0:0" duration="0:0:5" autoreverse="true" repeatbehavior="forever">
                                                <coloranimation from="#ed4646" to="#f0f2f7" repeatbehavior="forever" storyboard.targetproperty="(textblock.foreground).(solidcolorbrush.color)" storyboard.targetname="textblockrecording">
                                                </coloranimation>
                                            </storyboard>
                                        </beginstoryboard>
                                    </eventtrigger>
                                </textblock.triggers>
                            </textblock>

<textbox x:name="textboxsctm" style="{staticresource textboxextend}" controls:infoelement.placeholder="扫码" horizontalalignment="right" height="35" width="100" verticalalignment="center" margin="10,0,0,0" keydown="textboxsctm_onkeydown" input:inputmethod.isinputmethodenabled="false"></textbox>