我有一个控件，它以网格的形式在其中移动许多不同的控件。所以基本上，任何时候都没有显示任何容器控件。但我确实捕获了内部控件的所有 mousedown 和 mousemove 事件。 id 喜欢做的是创建一个类似于 windows 计算机桌面的效果，您可以在其中拖动，鼠标拖动中的每个控件都将被扔到一个列表中，当鼠标松开时，我可以执行对所有选定项目的操作。这可能吗？
【问题讨论】：
注册 OnMouseDown、OnMouseMove、OnMouseUp 事件。
查看example。
【讨论】：
经过反复试验，我解决了自己的问题。 在我孩子的每个控件中，我都这样做了：
protected override void OnMouseDown(MouseEventArgs e)
{
Point pnt = this.PointToScreen(e.Location);
base.OnMouseDown(new MouseEventArgs(e.Button, e.Clicks, pnt.X, pnt.Y, e.Delta));
}
protected override void OnMouseMove(MouseEventArgs e)
{
Point pnt = this.PointToScreen(e.Location);
base.OnMouseMove(new MouseEventArgs(e.Button, e.Clicks, pnt.X, pnt.Y, e.Delta));
}
为了使光标位置可以从容器控件中使用，并且在容器中我这样做了：
#region Lambda
item.MouseDown += new MouseEventHandler((a, b) =>
{
MessageBase hovering = this.GetChildAtPoint(tr_MouseCurrentPoint) as MessageBase;
if (b.Button == MouseButtons.Left)
{
tr_MouseDown = true;
tr_MouseDownPoint = this.PointToClient(b.Location);
mouseupdate();
foreach (var t in tr_CurrentlySelected)
{
t.Key.Selected = false;
}
tr_CurrentlySelected.Clear();
if (hovering != null && tr_CurrentlySelected.ContainsKey(hovering) == false)
{
tr_CurrentlySelected.Add(hovering, new MouseCoordinateStore(tr_MouseDown, tr_MouseDownPoint, tr_MouseCurrentPoint, tr_MouseDifference));
hovering.Selected = true;
tr_LastHoveredOver = hovering;
}
}
else if (b.Button == MouseButtons.Right)
{
if (hovering.Selected == true)
{
MessageBox.Show("Show Right Click Logic Here");
}
else
{
foreach (var t in tr_CurrentlySelected)
{
t.Key.Selected = false;
}
tr_CurrentlySelected.Clear();
if (hovering != null && tr_CurrentlySelected.ContainsKey(hovering) == false)
{
tr_CurrentlySelected.Add(hovering, new MouseCoordinateStore(tr_MouseDown, tr_MouseDownPoint, tr_MouseCurrentPoint, tr_MouseDifference));
hovering.Selected = true;
tr_LastHoveredOver = hovering;
}
MessageBox.Show("Show Right Click Logic Here");
}
}
});
item.MouseUp += new MouseEventHandler((a, b) => { tr_MouseDown = false; mouseupdate(); });
item.MouseMove += new MouseEventHandler((a, b) => {
tr_MouseCurrentPoint = this.PointToClient(b.Location);
mouseupdate();
if (tr_MouseDown)
{
MessageBase hovering = this.GetChildAtPoint(tr_MouseCurrentPoint) as MessageBase;
if (hovering != null)
{
if (tr_CurrentlySelected.ContainsKey(hovering) == false)
{
tr_CurrentlySelected.Add(hovering, new MouseCoordinateStore(tr_MouseDown, tr_MouseDownPoint, tr_MouseCurrentPoint, tr_MouseDifference));
tr_LastHoveredOver = hovering;
hovering.Selected = true;
}
else
{
int ind = hovering.Index;
List<MessageBase> ItemsToRemove = new List<MessageBase>();
if (tr_MouseDifference.Y < 0) // Y is negative
{
foreach (var dic in tr_CurrentlySelected)
{
if (dic.Key.Index < ind)
{
ItemsToRemove.Add(dic.Key);
}
}
}
else //Y is positive
{
foreach (var dic in tr_CurrentlySelected)
{
if (dic.Key.Index > ind)
{
ItemsToRemove.Add(dic.Key);
}
}
}
foreach (var dic in ItemsToRemove)
{
tr_CurrentlySelected.Remove(dic);
dic.Selected = false;
}
}
}
}
});
item.KeyDown += new KeyEventHandler((a, b) =>
{
try
{
if (b.KeyData == Keys.Down)
{
MessageBase hovering = ControlCollection[tr_LastHoveredOver.Index + 1];
foreach (var t in tr_CurrentlySelected)
{
t.Key.Selected = false;
}
tr_CurrentlySelected.Clear();
if (hovering != null && tr_CurrentlySelected.ContainsKey(hovering) == false)
{
tr_CurrentlySelected.Add(hovering, null);
hovering.Selected = true;
tr_LastHoveredOver = hovering;
}
}
else if (b.KeyData == Keys.Up)
{
MessageBase hovering = ControlCollection[tr_LastHoveredOver.Index - 1];
foreach (var t in tr_CurrentlySelected)
{
t.Key.Selected = false;
}
tr_CurrentlySelected.Clear();
if (hovering != null && tr_CurrentlySelected.ContainsKey(hovering) == false)
{
tr_CurrentlySelected.Add(hovering, null);
hovering.Selected = true;
tr_LastHoveredOver = hovering;
}
}
}
catch { }
});
#endregion
很明显，其他地方还发生了一些其他事情，但这就是它的基本原理。感谢我得到的一个答案，尽管我已经知道我得到了所有答案:) 谢谢大家！
【讨论】：