在运行时拖动表格控件 [英] Dragging Controls on Form at runtime
问题描述
我刚刚开始使用WPF。但我想加我的代码(从的WinForms)使用户可以拖动等。无论他们希望在运行任何控制。但我似乎无法得到鼠标的当前位置...咦?没有定位的鼠标? :(
I've just started using WPF. But I'm trying to add my code that (from Winforms) enables the user to drag any control whereever they wish at runtime. But I can't seem to get the current Location of the mouse... Eh? There is no Location for Mouse? :(
推荐答案
在鼠标事件,您可以使用e.GetPosition来获得当前鼠标的位置,此功能可提供鼠标相对于特定元素的位置,也可以直接传递null。
In the Mouse event you can use e.GetPosition to get the current mouse position. This function can provide the mouse position relative to a specific element or you can just pass null.
下面是一个很简单的例子,没有命中测试或任何东西,只是一个按钮,你可以拖动。我用一个画布,以保持它短,但你可能会做更好的使用转换和转换控制到所需位置。
Here is a very simple example, no hit testing or anything, just a button that you can drag around. And I used a canvas to keep it short, but you would probably do better to use a transform and translate the control to the desired position.
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Canvas PreviewMouseLeftButtonDown="Canvas_PreviewMouseLeftButtonDown"
PreviewMouseMove="Canvas_PreviewMouseMove"
PreviewMouseLeftButtonUp="Canvas_PreviewMouseLeftButtonUp">
<Button Name="dragButton" Width="80" Height="21" Canvas.Left="50" Canvas.Top="10">Drag Me!</Button>
</Canvas>
</Window>
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
namespace WpfApplication1
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private Point _startPoint;
private bool _dragging = false;
private void Canvas_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
if (dragButton.CaptureMouse())
{
_startPoint = e.GetPosition(null);
_dragging = true;
}
}
private void Canvas_PreviewMouseMove(object sender, MouseEventArgs e)
{
if (_dragging)
{
Point newPoint = e.GetPosition(null);
double dx = newPoint.X - _startPoint.X;
double dy = newPoint.Y - _startPoint.Y;
Canvas.SetLeft(dragButton, Canvas.GetLeft(dragButton) + dx);
Canvas.SetTop(dragButton, Canvas.GetTop(dragButton) + dy);
_startPoint = newPoint;
}
}
private void Canvas_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
if (_dragging)
{
_dragging = false;
dragButton.ReleaseMouseCapture();
}
}
}
}
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