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我想为 wpf 窗口的宽度和高度设置动画。我尝试了以下方法，不幸的是它只是为宽度设置动画......窗口的高度永远不会改变。

我确定我错过了一些愚蠢的事情，并希望通过在这里发帖有人会看到我的错误！

这是一个简单窗口背后的代码，我已经连接了一个按钮来调整大小：

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        this.AnimateWindowSize(ActualWidth + 200, ActualHeight + 200);
    }
}

这是我作为扩展方法编写的动画代码，因此它可以应用于任何窗口......

public static class WindowUtilties
{
    public static void AnimateWindowSize(this Window target, double newWidth, double newHeight)
    {
        var sb = new Storyboard {Duration = new Duration(new TimeSpan(0, 0, 0, 0, 200))};

        var aniWidth = new DoubleAnimationUsingKeyFrames();
        var aniHeight = new DoubleAnimationUsingKeyFrames();

        aniWidth.Duration = new Duration(new TimeSpan(0, 0, 0, 0, 200));
        aniHeight.Duration = new Duration(new TimeSpan(0, 0, 0, 0, 200));

        aniHeight.KeyFrames.Add(new EasingDoubleKeyFrame(target.ActualHeight, KeyTime.FromTimeSpan(new TimeSpan(0, 0, 0, 0, 00))));
        aniHeight.KeyFrames.Add(new EasingDoubleKeyFrame(newHeight, KeyTime.FromTimeSpan(new TimeSpan(0, 0, 0, 0, 200))));
        aniWidth.KeyFrames.Add(new EasingDoubleKeyFrame(target.ActualWidth, KeyTime.FromTimeSpan(new TimeSpan(0, 0, 0, 0, 00))));
        aniWidth.KeyFrames.Add(new EasingDoubleKeyFrame(newWidth, KeyTime.FromTimeSpan(new TimeSpan(0, 0, 0, 0, 200))));

        Storyboard.SetTarget(aniWidth, target);
        Storyboard.SetTargetProperty(aniWidth, new PropertyPath(Window.WidthProperty));

        Storyboard.SetTarget(aniHeight, target);
        Storyboard.SetTargetProperty(aniHeight, new PropertyPath(Window.HeightProperty));

        sb.Children.Add(aniWidth);
        sb.Children.Add(aniHeight);

        sb.Begin();
    }
}

提前感谢您的帮助。

4

2 回答 2

2

在 Joe 关于使用 pinvoke 和依赖属性的评论之后，我最终得到了这段代码。如果代码很长，我现在会道歉，我不应该把它都放在这里。数学在尺寸上并不完美。WPF Actual(Height/Width) 与 Rect.Height/Width 之间存在很大差异，可能需要进行一些计算才能获得所需的确切尺寸。

这被添加到 MainWindow 类

[StructLayout(LayoutKind.Sequential)]
public struct RECT
{
    public int X;
    public int Y;
    public int Width;
    public int Height;
}

public enum SpecialWindowHandles
{
    HWND_TOP = 0,
    HWND_BOTTOM = 1,
    HWND_TOPMOST = -1,
    HWND_NOTOPMOST = -2
}

[DllImport("user32.dll", SetLastError = true)]
static extern bool GetWindowRect(IntPtr hWnd, ref RECT Rect);

[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);

public static readonly DependencyProperty WindowHeightAnimationProperty = DependencyProperty.Register("WindowHeightAnimation", typeof(double),
                                                                                            typeof(MainWindow), new PropertyMetadata(OnWindowHeightAnimationChanged));

private static void OnWindowHeightAnimationChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
    var window = d as Window;

    if (window != null)
    {
        IntPtr handle = new WindowInteropHelper(window).Handle;
        var rect = new RECT();
        if (GetWindowRect(handle, ref rect))
        {
            rect.X = (int)window.Left;
            rect.Y = (int)window.Top;

            rect.Width = (int)window.ActualWidth;
            rect.Height = (int)(double)e.NewValue;  // double casting from object to double to int

            SetWindowPos(handle, new IntPtr((int)SpecialWindowHandles.HWND_TOP), rect.X, rect.Y, rect.Width, rect.Height, (uint)SWP.SHOWWINDOW);
        }
    }
}

public double WindowHeightAnimation
{
    get { return (double)GetValue(WindowHeightAnimationProperty); }
    set { SetValue(WindowHeightAnimationProperty, value); }
}

public static readonly DependencyProperty WindowWidthAnimationProperty = DependencyProperty.Register("WindowWidthAnimation", typeof(double),
                                                                                            typeof(MainWindow), new PropertyMetadata(OnWindowWidthAnimationChanged));

private static void OnWindowWidthAnimationChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
    var window = d as Window;

    if (window != null)
    {
        IntPtr handle = new WindowInteropHelper(window).Handle;
        var rect = new RECT();
        if (GetWindowRect(handle, ref rect))
        {
            rect.X = (int)window.Left;
            rect.Y = (int) window.Top;
            var width = (int)(double)e.NewValue;
            rect.Width = width;
            rect.Height = (int) window.ActualHeight;

            SetWindowPos(handle, new IntPtr((int)SpecialWindowHandles.HWND_TOP), rect.X, rect.Y, rect.Width, rect.Height, (uint)SWP.SHOWWINDOW);
        }
    }
}

public double WindowWidthAnimation
{
    get { return (double)GetValue(WindowWidthAnimationProperty); }
    set { SetValue(WindowWidthAnimationProperty, value); }
}

private void GrowClick(object sender, RoutedEventArgs e)
{
    this.AnimateWindowSize(Width+200, Height+200);
}

/// <summary>
/// SetWindowPos Flags
/// </summary>
public static class SWP
{
    public static readonly int
    NOSIZE = 0x0001,
    NOMOVE = 0x0002,
    NOZORDER = 0x0004,
    NOREDRAW = 0x0008,
    NOACTIVATE = 0x0010,
    DRAWFRAME = 0x0020,
    FRAMECHANGED = 0x0020,
    SHOWWINDOW = 0x0040,
    HIDEWINDOW = 0x0080,
    NOCOPYBITS = 0x0100,
    NOOWNERZORDER = 0x0200,
    NOREPOSITION = 0x0200,
    NOSENDCHANGING = 0x0400,
    DEFERERASE = 0x2000,
    ASYNCWINDOWPOS = 0x4000;
}

在 OP 的代码中，我相应地更改了 height 和 width 目标属性

Storyboard.SetTargetProperty(aniHeight, new PropertyPath(Window.HeightProperty));
Storyboard.SetTargetProperty(aniWidth, new PropertyPath(Window.WidthProperty));

至

Storyboard.SetTargetProperty(aniHeight, new PropertyPath(MainWindow.WindowHeightAnimationProperty));
Storyboard.SetTargetProperty(aniWidth, new PropertyPath(MainWindow.WindowWidthAnimationProperty));

原答案：

根据我的发现，您的代码没有问题。当我更改将动画添加到情节提要 (sb.Children.Add) 实例的顺序时，我得到了没有宽度的高度动画。

这让我相信，当第一个动画发生时，另一个动画变得无效。

我所能想到的就是让它们一个接一个地制作动画，方法是让一个动画比另一个稍长。较长的动画将在第一个动画完成后出现。

var sb = new Storyboard { Duration = new Duration(new TimeSpan(0, 0, 0, 0, 300)) };

var aniWidth = new DoubleAnimationUsingKeyFrames();
var aniHeight = new DoubleAnimationUsingKeyFrames();

aniWidth.Duration = new Duration(new TimeSpan(0, 0, 0, 0, 300));
aniHeight.Duration = new Duration(new TimeSpan(0, 0, 0, 0, 150));

aniHeight.KeyFrames.Add(new EasingDoubleKeyFrame(target.ActualHeight, KeyTime.FromTimeSpan(new TimeSpan(0, 0, 0, 0, 00))));
aniHeight.KeyFrames.Add(new EasingDoubleKeyFrame(newHeight, KeyTime.FromTimeSpan(new TimeSpan(0, 0, 0, 0, 150))));

aniWidth.KeyFrames.Add(new EasingDoubleKeyFrame(target.ActualWidth, KeyTime.FromTimeSpan(new TimeSpan(0, 0, 0, 0, 150))));
aniWidth.KeyFrames.Add(new EasingDoubleKeyFrame(newWidth, KeyTime.FromTimeSpan(new TimeSpan(0, 0, 0, 0, 300))));

即使使用 XAML 故事板，我也无法同时调整窗口的高度和宽度。

于 2012-09-08T21:05:43.860 回答
0

新 DP 的一个建议对我来说似乎有点矫枉过正，特别是因为该解决方案承认它仍然不会同时调整大小。在我的快速实验中，添加甚至 1ms 的延迟（通过 Task.Run()）实现了最终结果（窗口大小调整）。该解决方案也不会同时调整大小，因此动画并不像它应该的那样优雅，但它最终“有效”。

于 2014-02-17T06:04:47.467 回答