如何在WPF窗口中通过鼠标移动椭圆。
private void ellipse_MouseMove(object sender, System.Windows.Input.MouseEventArgs e)
{
Ellipse ellipse = sender as Ellipse;
if (ellipse != null && e.LeftButton == MouseButtonState.Pressed)
{
DragDrop.DoDragDrop(ellipse,
ellipse.Fill.ToString(),
System.Windows.DragDropEffects.Copy);
}
}
如何创建方法ellipse_MouseClick
?
答案 0 :(得分:4)
Ellipses上没有MouseClick事件,但是有MouseDown和MouseUp事件。我假设你正在寻找这样的东西。
<Window x:Class="WpfApplication.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Height="350" Width="525"
MouseMove="Any_MouseMove"
>
<Canvas>
<Ellipse Fill="Lavender" Height="100" Width="100"
MouseLeftButtonDown="Ellipse_MouseLeftButtonDown"
MouseLeftButtonUp="Ellipse_MouseLeftButtonUp"
MouseMove="Any_MouseMove" />
</Canvas>
</Window>
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
namespace WpfApplication
{
public partial class MainWindow : Window
{
private UIElement _lastClickedUIElement;
private Point? _clickOffset;
public MainWindow() { InitializeComponent(); }
private void Ellipse_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
_lastClickedUIElement = sender as UIElement;
_clickOffset = e.GetPosition(_lastClickedUIElement);
}
private void Ellipse_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
_lastClickedUIElement = null;
}
private void Any_MouseMove(object sender, MouseEventArgs e)
{
if (_lastClickedUIElement == null)
return;
_lastClickedUIElement.SetValue(Canvas.LeftProperty, e.GetPosition(this).X - _clickOffset.Value.X);
_lastClickedUIElement.SetValue(Canvas.TopProperty, e.GetPosition(this).Y - _clickOffset.Value.Y);
}
}
}
点击圆圈移动它。只要您为这些方法提供这些方法,这将适用于任何UI元素。随意在画布上添加一个Rectangle。
<Rectangle Fill="Lavender" Height="100" Width="100"
MouseLeftButtonDown="Ellipse_MouseLeftButtonDown"
MouseLeftButtonUp="Ellipse_MouseLeftButtonUp"
MouseMove="Any_MouseMove" />
答案 1 :(得分:1)
我使用三个事件来完成这项任务:
<强> XAML:强>
<Window x:Class="WpfPainting.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="500" Width="700" WindowStartupLocation="CenterScreen">
<DockPanel>
<Canvas Background="White" Name="CanvasArea"/>
</DockPanel>
</Window>
<强>代码:强>
private UIElement source;
private bool captured;
double x_shape, x_canvas, y_shape, y_canvas;
private void ellipse_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
Mouse.OverrideCursor = Cursors.SizeAll;
source = (UIElement)sender;
Mouse.Capture(source);
captured = true;
x_shape = Canvas.GetLeft(source);
x_canvas = e.GetPosition(CanvasArea).X;
y_shape = Canvas.GetTop(source);
y_canvas = e.GetPosition(CanvasArea).Y;
}
private void ellipse_MouseMove(object sender, MouseEventArgs e)
{
if (captured)
{
double x = e.GetPosition(CanvasArea).X;
double y = e.GetPosition(CanvasArea).Y;
x_shape += x - x_canvas;
Canvas.SetLeft(source, x_shape);
x_canvas = x;
y_shape += y - y_canvas;
Canvas.SetTop(source, y_shape);
y_canvas = y;
}
}
private void ellipse_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
Mouse.Capture(null);
captured = false;
Mouse.OverrideCursor = null;
}
要在绘制的椭圆上使用事件,我可以像这样引用它们:
ellipse.MouseLeftButtonDown += conveyor_MouseLeftButtonDown;
ellipse.MouseMove += conveyor_MouseMove;
ellipse.MouseLeftButtonUp += conveyor_MouseLeftButtonUp;