我有以下XAML,我希望将其转换为代码,我已经能够成功创建动画,因此控件淡入&如预期的那样,但是我将IsMouseOver触发器转换为代码隐藏时遇到了问题:
<DataTemplate.Triggers>
<EventTrigger RoutedEvent="Control.Loaded"
SourceName="NotificationGrid">
<BeginStoryboard x:Name="BeginNotificationStoryboard">
<Storyboard x:Name="NotificationStoryboard">
<DoubleAnimation Storyboard.TargetName="NotificationGrid"
From="0.01"
To="1"
Storyboard.TargetProperty="Opacity"
Duration="0:0:0.5" />
<DoubleAnimation Storyboard.TargetName="NotificationGrid"
From="1"
To="0"
Storyboard.TargetProperty="Opacity"
Duration="0:0:0.5"
BeginTime="0:0:5" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
<Trigger Property="IsMouseOver"
Value="True">
<Trigger.EnterActions>
<SeekStoryboard Offset="0:0:3"
BeginStoryboardName="BeginNotificationStoryboard" />
<PauseStoryboard BeginStoryboardName="BeginNotificationStoryboard" />
</Trigger.EnterActions>
<Trigger.ExitActions>
<SeekStoryboard Offset="0:0:3"
BeginStoryboardName="BeginNotificationStoryboard" />
<ResumeStoryboard BeginStoryboardName="BeginNotificationStoryboard" />
</Trigger.ExitActions>
</Trigger>
</DataTemplate.Triggers>
</DataTemplate>
我遇到的问题是如何知道SeekStoryboard类实例的'BeginStoryboardName'值应该是什么,因为我没有必要创建一个BeginStoryboard实例来使加载动画按预期工作。
var loadingAnimation = new DoubleAnimation(0.01, 1, new Duration(TimeSpan.FromSeconds(0.5)));
var closingAnimation = new DoubleAnimation(1, 0, new Duration(TimeSpan.FromSeconds(3)))
{
BeginTime = TimeSpan.FromSeconds(5)
};
Storyboard.SetTarget(loadingAnimation, AssociatedObject);
Storyboard.SetTarget(closingAnimation, AssociatedObject);
Storyboard.SetTargetProperty(loadingAnimation, new PropertyPath(UIElement.OpacityProperty));
Storyboard.SetTargetProperty(closingAnimation, new PropertyPath(UIElement.OpacityProperty));
Storyboard.SetTarget(loadingAnimation, AssociatedObject);
Storyboard.SetTarget(closingAnimation, AssociatedObject);
var storyboard = new Storyboard();
storyboard.Children.Add(loadingAnimation);
storyboard.Children.Add(closingAnimation);
var enterSeekStoryboard = new SeekStoryboard
{
Offset = TimeSpan.FromSeconds(5),
// What value should go here?
BeginStoryboardName = ""
};
var exitSeekStoryboard = new SeekStoryboard
{
Offset = TimeSpan.FromSeconds(5),
// What value should go here?
BeginStoryboardName = ""
};
var trigger = new Trigger
{
Property = UIElement.IsMouseOverProperty,
Value = true
};
trigger.EnterActions.Add(enterSeekStoryboard);
trigger.ExitActions.Add(exitSeekStoryboard);
var style = new Style();
style.Triggers.Add(trigger);
AssociatedObject.Style = style;
storyboard.Completed += HandleOnCompleted;
storyboard.Begin();
答案 0 :(得分:3)
您的完整代码将是这样的。我已经留下了一些评论来指出我发现的一些问题:
var loadingAnimation = new DoubleAnimation(0.01, 1, new Duration(TimeSpan.FromSeconds(0.5)));
var closingAnimation = new DoubleAnimation(1, 0, new Duration(TimeSpan.FromSeconds(3)))
{
BeginTime = TimeSpan.FromSeconds(5)
};
Storyboard.SetTarget(loadingAnimation, AssociatedObject);
Storyboard.SetTarget(closingAnimation, AssociatedObject);
Storyboard.SetTargetProperty(loadingAnimation, new PropertyPath(UIElement.OpacityProperty));
Storyboard.SetTargetProperty(closingAnimation, new PropertyPath(UIElement.OpacityProperty));
Storyboard.SetTarget(loadingAnimation, AssociatedObject);
Storyboard.SetTarget(closingAnimation, AssociatedObject);
var storyboard = new Storyboard();
storyboard.Children.Add(loadingAnimation);
storyboard.Children.Add(closingAnimation);
// Subscription to events must be done at this point, because the Storyboard object becomes frozen later on
storyboard.Completed += HandleOnCompleted;
string storyBoardName = "BeginNotificationStoryboard";
// We define the BeginStoryBoard action for the EventTrigger
var beginStoryboard = new BeginStoryBoard();
beginStoryboard.Name = storyBoardName;
beginStoryboard.Storyboard = storyboard;
// We create the EventTrigger
var eventTrigger = new EventTrigger(Control.LoadedEvent);
eventTrigger.Actions.Add(beginStoryboard);
// Actions for the entering animation
var enterSeekStoryboard = new SeekStoryboard
{
Offset = TimeSpan.FromSeconds(5),
BeginStoryboardName = storyBoardName
};
var enterPauseStoryboard = new PauseStoryboard
{
BeginStoryboardName = storyBoardName
};
// Actions for the exiting animation
var exitSeekStoryboard = new SeekStoryboard
{
Offset = TimeSpan.FromSeconds(5),
BeginStoryboardName = storyBoardName
};
var exitResumeStoryboard = new ResumeStoryboard
{
BeginStoryboardName = storyBoardName
};
var trigger = new Trigger
{
Property = UIElement.IsMouseOverProperty,
Value = true
};
trigger.EnterActions.Add(enterSeekStoryboard);
trigger.EnterActions.Add(enterPauseStoryboard);
trigger.ExitActions.Add(exitSeekStoryboard);
trigger.ExitActions.Add(exitResumeStoryboard);
var style = new Style();
// The name of the Storyboard must be registered so the actions can find it
style.RegisterName(storyBoardName, beginStoryboard);
// Add both the EventTrigger and the regular Trigger
style.Triggers.Add(eventTrigger);
style.Triggers.Add(trigger);
AssociatedObject.Style = style;
// No need for storyboard.Begin()
答案 1 :(得分:1)
您已创建了Storyboard但未创建BeginStoryboard。所以这样做:
var storyboard = new Storyboard();
storyboard.Children.Add(loadingAnimation);
storyboard.Children.Add(closingAnimation);
var beginStoryboard = new BeginStoryboard(){ Name="BeginNotificationStoryboard", Storyboard = storyboard};
var enterSeekStoryboard = new SeekStoryboard
{
Offset = TimeSpan.FromSeconds(5),
// What value should go here?
BeginStoryboardName = "BeginNotificationStoryboard"
};
别忘了像以前一样将beginStoryboard添加到EventTrigger。
实际上,原始的XAML代码使用了BeginNotificationStoryboard id来删除一些代码重复项。 如果您不再需要它,只需将其添加到TriggerActions,如下所示:
trigger.EnterActions.Add(beginStoryboard);
您不需要指定名称。