我正在使用WPF和VB.net的项目。我想在视觉上模拟“拖动”对象(尽管出于目的,我不想使用标准拖放)。
[基本上,我有一个标签对象,在其MouseDown事件上,我希望它跟随鼠标光标在640x480实心尺寸网格内(但不在其外部!)。请注意,此网格位于全屏窗口的中央。再次,该对象不应跟随鼠标超出网格之外(我猜这里是“ ClipToBounds = True”)]
然后,在标签的MouseUp事件上,我希望它要么停留在当前位置,要么返回到其原始位置,该位置由另一个对象的MouseEnter属性设置的布尔变量的值确定。
注意,如果使用起来更容易,我可以将网格更改为束带中的画布。我猜这是理想的。
因此,经过冗长的解释,这是我的问题(双重):
如何使对象(标签)跟随鼠标光标在网格/画布内部,而不是在网格/画布外部?这需要在标签的MouseDown事件上发生。
如何使对象“粘”在其当前位置? (由此,我大概可以弄清楚如何使它自己恢复到原始位置。:D)
我对任何可以帮助我最有效地实现此目标的人的支持!非常感谢大家。
类似这样的事情:
XAML:
<Canvas x:Name="canv" ToolTip="tt one" Width="400" Height="400" Background="Blue">
<Rectangle x:Name="rec" Fill="Red" Height="50" Width="50" MouseDown="Rectangle_MouseDown" MouseMove="Rectangle_MouseMove" MouseUp="Rectangle_MouseUp" />
</Canvas>
CODE-BEHIND:
private bool isDragging;
private void Rectangle_MouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
rec.CaptureMouse();
isDragging = true;
}
private void Rectangle_MouseMove(object sender, System.Windows.Input.MouseEventArgs e)
{
if (isDragging)
{
Point canvPosToWindow = canv.TransformToAncestor(this).Transform(new Point(0, 0));
Rectangle r = sender as Rectangle;
var upperlimit = canvPosToWindow.Y + (r.Height / 2);
var lowerlimit = canvPosToWindow.Y + canv.ActualHeight - (r.Height / 2);
var leftlimit = canvPosToWindow.X + (r.Width / 2);
var rightlimit = canvPosToWindow.X + canv.ActualWidth - (r.Width / 2);
var absmouseXpos = e.GetPosition(this).X;
var absmouseYpos = e.GetPosition(this).Y;
if ((absmouseXpos > leftlimit && absmouseXpos < rightlimit)
&& (absmouseYpos > upperlimit && absmouseYpos < lowerlimit))
{
Canvas.SetLeft(r, e.GetPosition(canv).X - (r.Width / 2));
Canvas.SetTop(r, e.GetPosition(canv).Y - (r.Height / 2));
}
}
}
private void Rectangle_MouseUp(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
rec.ReleaseMouseCapture();
isDragging = false;
}
此代码可以增强,但我认为您明白了;)
基于@Bruno,这是我的解决方案:
double maxX;
double maxY;
private void OnRectMouseDown(object sender, MouseButtonEventArgs e)
{
maxX = canv.ActualWidth - rect.Width;
maxY = canv.ActualHeight - rect.Height;
rect.CaptureMouse();
rect.MouseMove += OnRectMouseMove;
rect.MouseUp += OnRectMouseUp;
}
private void OnRectMouseMove(object sender, MouseEventArgs e)
{
var pos = e.GetPosition(canv);
var newX = pos.X - (rect.Width / 2);
var newY = pos.Y - (rect.Height / 2);
if (newX < 0) newX = 0;
if (newX > maxX) newX = maxX;
if (newY < 0) newY = 0;
if (newY > maxY) newY = maxY;
rect.SetValue(Canvas.LeftProperty, newX);
rect.SetValue(Canvas.TopProperty, newY);
xVal.Content = (newX / maxX).ToString("F3");
yVal.Content = (newY / maxY).ToString("F3");
}
private void OnRectMouseUp(object sender, MouseButtonEventArgs e)
{
rect.ReleaseMouseCapture();
rect.MouseMove -= OnRectMouseMove;
rect.MouseUp -= OnRectMouseUp;
}
请尝试:
private void Form1_MouseClick(object sender, MouseEventArgs e)
{
(name).Location = new Point(e.X,e.Y);
}
因此,如果单击该对象,它将出现在其中