WPF弹出控件 - 查找X,Y坐标

时间:2010-01-12 20:01:20

标签: c# wpf xaml popup

我正在尝试获取弹出控件的X,Y坐标。我试过了:

VisualTreeHelper.GetOffset(弹出);

但返回的向量总是包含(0,0)X和Y.

弹出窗口的父级是布局根目录,即网格。

CustomPopupPlacementCallback也总是为它的Point参数返回0,0。

目标是允许用户将弹出窗口拖动到屏幕上的任何位置。我打算通过获取当前弹出窗口和鼠标位置,并以与鼠标移动方向相同的方向移动弹出窗口来尝试完成此操作。

--------------------更新--------------------

Chris Nicol,我已经使用以下代码尝试了您的答案,但仍然收到0,0 for rootPoint:

的Xaml:

<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Class="Test.MainWindow"
x:Name="Window"
Title="MainWindow"
Width="800" Height="600">    

<Grid x:Name="LayoutRoot">
    <Popup x:Name="Popup" IsOpen="True" Placement="Center" Width="100" Height="100">
        <Button Click="Button_Click" Content="Test" />
    </Popup>
</Grid>

代码背后:

public partial class MainWindow : Window
{
    public MainWindow()
    {
        this.InitializeComponent();

        // Insert code required on object creation below this point.
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        GeneralTransform transform = Popup.TransformToAncestor(LayoutRoot);
        Point rootPoint = transform.Transform(new Point(0, 0));
    }
}

2 个答案:

答案 0 :(得分:2)

不确定这是找出问题的最佳方法,但确实有效:

GeneralTransform transform = controlToFind.TransformToAncestor(TopLevelControl);
            Point rootPoint = transform.Transform(new Point(0, 0));

答案 1 :(得分:1)

您必须使用win32 api:

将此添加到您的班级:

    [DllImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);

    [StructLayout(LayoutKind.Sequential)]
    private struct RECT
    {
        public int Left; // X coordinate of topleft point
        public int Top; // Y coordinate of topleft point
        public int Right; // X coordinate of bottomright point
        public int Bottom; // Y coordinate of bottomright point
    }

用于查找X,Y坐标将此输入到您的代码中(在矩形中您已请求坐标):

        IntPtr handle = (PresentationSource.FromVisual(popup.Child) as HwndSource).Handle;

        RECT rect = new RECT();
        GetWindowRect(handle, out rect);