在图像控制WPF加载时动画图片 [英] Animate Image when loaded in Image Control WPF
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问题描述
我想创建影像的幻灯片播放。为此，我有充足的时间每套间隔后装入图像控制新形象。但每次我加载说到没有任何动画，我需要在出动画的过渡动画或褪色加载每个图像的新形象。我怎样才能实现动画，同时在图像控制变化的图像？以下是code：
XAML：
＆LT;网格和GT;
＆lt;图像来源={结合CurrentImage}/＆GT;
＆LT; /网格和GT;
XAML.cs
视图模型=新ScreenSaverViewModel（）;
this.DataContext =视图模型;
ViewModel.cs
///＆LT;总结＆gt;
///获取当前图像显示吸引屏幕上。更改这个属性
///导致发出信号PropertyChanged事件
///＆LT; /总结＆gt;
公共字符串CurrentImage
{
得到
{
返回this.currentImage;
} 保护套
{
this.currentImage =价值;
this.OnPropertyChanged（CurrentImage）;
}
} ///＆LT;总结＆gt;
///获取所有图像的观察的集合。
///＆LT; /总结＆gt;
公众的ObservableCollection＆LT;串GT;图片
{
得到
{
返回this.images;
}
} 公共ScreenSaverViewModel（）
{
照片=新的ObservableCollection＆LT;串GT;（）; this.LoadSlideShowImages（）; 如果（图片=空＆放大器;！＆放大器; Images.Count大于0）
{
this.CurrentImage = this.Images [this.currentIndex] this.tickTimer =新DispatcherTimer（）;
this.tickTimer.Interval = TimeSpan.FromMilliseconds（TimerIntervalMilliseconds）;
this.tickTimer.Tick + =（S，E）=＆GT;
{
this.currentIndex ++;
this.currentIndex = this.currentIndex＆LT; this.Images.Count？ this.currentIndex：0;
this.CurrentImage = this.Images [this.currentIndex]
}; 后映像加载//启动定时器
this.tickTimer.Start（）;
}
}
解决方案
我已经创建了我所提出的财产变化的类继承Image控件时的图像控制的变化源。关于这一点我已经申请触发器现在这个工作正常。以下是code：
＆LT;控制：ImageControl来源={结合CurrentImage}＆GT;
＆LT;控制：ImageControl.Triggers＆GT;
＆LT;的EventTrigger RoutedEvent =控制：ImageControl.SourceChanged＆GT;
＆LT; BeginStoryboard＆GT;
＆LT;情节提要＆GT;
＆所述; DoubleAnimation是Storyboard.TargetProperty =（Image.Opacity）从=0要=1持续时间=0：0：1/＆GT;
＆LT; /故事板＆GT;
＆LT; / BeginStoryboard＆GT;
＆LT; /＆的EventTrigger GT;
＆LT; /控制：ImageControl.Triggers＆GT;
＆LT; /控制：ImageControl＆GT;
公共类ImageControl：图片
{
公共静态只读RoutedEvent SourceChangedEvent = EventManager.RegisterRoutedEvent（
SourceChanged，RoutingStrategy.Direct的typeof（RoutedEventHandler）的typeof（ImageControl））; 静态ImageControl（）
{
Image.SourceProperty.OverrideMetadata（typeof运算（ImageControl），新FrameworkPropertyMetadata（SourcePropertyChanged））;
} 公共事件RoutedEventHandler SourceChanged
{
添加{的AddHandler（SourceChangedEvent，值）; }
除去{RemoveHandler（SourceChangedEvent，值）; }
} 私有静态无效SourcePropertyChanged（OBJ的DependencyObject，DependencyPropertyChangedEventArgs E）
{
形象画像= OBJ为图像;
如果（形象！= NULL）
{
image.RaiseEvent（新RoutedEventArgs（SourceChangedEvent））;
}
}
}
I want to create a slideshow of images. For this I have loaded new images in image control after every set interval of time. But each time i load a new image it comes without any animation I need to load each image with a transition animation or fade in-out animation. How can I achieve animation while changing images in Image control? Following is the code:
XAML:
<Grid>
<Image Source="{Binding CurrentImage}" />
</Grid>
XAML.cs
ViewModel = new ScreenSaverViewModel();
this.DataContext = ViewModel;
ViewModel.cs
/// <summary>
/// Gets the current image to display on the attract screen. Changes to this property
/// cause the PropertyChanged event to be signaled
/// </summary>
public string CurrentImage
{
get
{
return this.currentImage;
}
protected set
{
this.currentImage = value;
this.OnPropertyChanged("CurrentImage");
}
}
/// <summary>
/// Gets the observable collection of all images.
/// </summary>
public ObservableCollection<string> Images
{
get
{
return this.images;
}
}
public ScreenSaverViewModel()
{
images = new ObservableCollection<string>();
this.LoadSlideShowImages();
if (Images != null && Images.Count > 0)
{
this.CurrentImage = this.Images[this.currentIndex];
this.tickTimer = new DispatcherTimer();
this.tickTimer.Interval = TimeSpan.FromMilliseconds(TimerIntervalMilliseconds);
this.tickTimer.Tick += (s, e) =>
{
this.currentIndex++;
this.currentIndex = this.currentIndex < this.Images.Count ? this.currentIndex : 0;
this.CurrentImage = this.Images[this.currentIndex];
};
// start the timer after image is loaded
this.tickTimer.Start();
}
}
解决方案
I have created a class inheriting Image control in which I have raised property change when Source of image control changes. on which I have applied trigger this works fine now. Following is the code:
<controls:ImageControl Source="{Binding CurrentImage}" >
<controls:ImageControl.Triggers>
<EventTrigger RoutedEvent="controls:ImageControl.SourceChanged">
<BeginStoryboard>
<Storyboard>
<DoubleAnimation Storyboard.TargetProperty="(Image.Opacity)" From="0" To="1" Duration="0:0:1" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</controls:ImageControl.Triggers>
</controls:ImageControl>
public class ImageControl : Image
{
public static readonly RoutedEvent SourceChangedEvent = EventManager.RegisterRoutedEvent(
"SourceChanged", RoutingStrategy.Direct, typeof(RoutedEventHandler), typeof(ImageControl));
static ImageControl()
{
Image.SourceProperty.OverrideMetadata(typeof(ImageControl), new FrameworkPropertyMetadata(SourcePropertyChanged));
}
public event RoutedEventHandler SourceChanged
{
add { AddHandler(SourceChangedEvent, value); }
remove { RemoveHandler(SourceChangedEvent, value); }
}
private static void SourcePropertyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
Image image = obj as Image;
if (image != null)
{
image.RaiseEvent(new RoutedEventArgs(SourceChangedEvent));
}
}
}
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