我的意思是，我只想在用户将鼠标指针移出 pictureBox1 客户区域时才激活鼠标离开事件。只有当他按下鼠标左键时才会发生这种情况，但如果用户没有按下鼠标左键则不会发生这种情况，即他可以自由移动鼠标并且事件不会做任何事情。
我在 Form1 的顶部有一个名为 mouseLeave 类型 bool 的变量。
在构造函数中，我将其设为假；
在pictureBox1 鼠标按下事件中，我将mouseLeave 变量设置为true。
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
label1.Visible = true;
label4.Visible = true;
// find the index that is closest to the current mouse location
float t = wireObject1.GetIndexByXY(e.X, e.Y, 5);
if (t == -1)
{
button3.Enabled = false;
}
else
{
button3.Enabled = true;
{
selectedIndex = t;
mouseMove = true;
mouseLeave = true;
在 pictureBox1 鼠标移动事件中，我检查 mouseMove 是否为真，然后移动点拖动它：
private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
if (mouseMove == true)
{
Point NewPoint = e.Location;
{
wireObject1.MovePoint(selectedIndex, NewPoint, NewPoint); // when moving a point dragging the other point is vanished deleted. To check why !
label1.Text = "{X = " + NewPoint.X + "}" + " " + "{Y = " + NewPoint.Y + "}";
pictureBox1.Refresh();
}
}
else
{
label19.Text = "{X = " + e.X + "}" + " " + "{Y = " + e.Y + "}";
}
}
因此，当用户单击鼠标左键而不离开它并拖动该点时，该点将在pictureBox1客户区周围移动。
现在在 pictureBox1 鼠标离开事件中我做了：
private void pictureBox1_MouseLeave(object sender, EventArgs e)
{
if (mouseLeave == true)
{
mouseMove = false;
}
}
但它不起作用。我添加了一个点，拖动它移动它，但是只有当我将鼠标指针移出pictureBox1区域而不拖动点时，这个事件才激活才做一些事情，只有当我没有点击鼠标左键时。
我想要的是，只有当我单击鼠标左键并像在鼠标移动事件中那样移动它时，这个离开事件才会在这种情况下做一些事情，这会使 mouseMove 为假。
因此用户将无法将点拖出pictureBox1 区域。那我应该在鼠标离开事件中做什么？
已编辑**
这是 button1 单击我每次将新点添加到pictureBox1 区域的地方。还有我画点的绘画事件。
也许这将有助于解决拖出pictureBox边界时它停止但不在正确位置的问题。
private void button1_Click(object sender, EventArgs e)
{
halfX = pictureBox1.ClientRectangle.Width / 2;
halfY = pictureBox1.ClientRectangle.Height / 2;
Random rnd = new Random();
offsetX = rnd.Next(-10, 10);
offsetY = rnd.Next(-10, 10);
wireObject1.addPoint(halfX + offsetX, halfY + offsetY);
if (wireObjectCoordinates1 == null)
wireObjectCoordinates1 = new WireObjectCoordinates() { FrameNumber = currentFrameIndex };
wireObjectCoordinates1.Point_X.Add(halfX + offsetX);
wireObjectCoordinates1.Point_Y.Add(halfY + offsetY);
wireObjectAnimation1._coordinatesList.Add(wireObjectCoordinates1);
pictureBox1.Refresh();
numberOfPoints++;
label5.Text = "{X = " + (halfX + offsetX) + "}" + " " + "{Y = " + (halfY + offsetY) + "}";
label5.Visible = true;
label7.Visible = true;
label16.Text = numberOfPoints.ToString();
label16.Visible = true;
label15.Visible = true;
buttonLockMode = true;
button8.Enabled = true;
button4.Enabled = true;
}
private void pictureBox1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
Point connectionPointStart;
Point connectionPointEnd;
Graphics g = e.Graphics;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
SolidBrush brush = new SolidBrush(Color.Red);
Pen p = new Pen(brush);
for (int idx = 0; idx < wireObject1._point_X.Count; ++idx)
{
Point dPoint = new Point((int)wireObject1._point_X[idx], (int)wireObject1._point_Y[idx]);
dPoint.X = dPoint.X - 5; // was - 2
dPoint.Y = dPoint.Y - 5; // was - 2
Rectangle rect = new Rectangle(dPoint, new Size(10, 10));
g.FillEllipse(brush, rect);
// g.FillEllipse(brush, rect);
}
for (int i = 0; i < wireObject1._connectionstart.Count; i++)
{
int startIndex = wireObject1._connectionstart[i];
int endIndex = wireObject1._connectionend[i];
connectionPointStart = new Point((int)wireObject1._point_X[startIndex], (int)wireObject1._point_Y[startIndex]);
connectionPointEnd = new Point((int)wireObject1._point_X[endIndex], (int)wireObject1._point_Y[endIndex]);
p.Width = 4;
g.DrawLine(p, connectionPointStart, connectionPointEnd);
}
}
我想我通过将鼠标中的 if 更改为这样来解决它：
if (!((PictureBox)sender).ClientRectangle.Contains(NewPoint.X + 5,NewPoint.Y) || (!((PictureBox)sender).ClientRectangle.Contains(NewPoint.X - 5,NewPoint.Y) ||
!((PictureBox)sender).ClientRectangle.Contains(NewPoint.X, NewPoint.Y + 5)) || (!((PictureBox)sender).ClientRectangle.Contains(NewPoint.X, NewPoint.Y - 5)))
所以 move 事件应该是这样的：
private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
if (mouseMove == true)
{
mouseDrag = true;
Point NewPoint = e.Location;
if (!((PictureBox)sender).ClientRectangle.Contains(NewPoint.X + 5,NewPoint.Y) || (!((PictureBox)sender).ClientRectangle.Contains(NewPoint.X - 5,NewPoint.Y) ||
!((PictureBox)sender).ClientRectangle.Contains(NewPoint.X, NewPoint.Y + 5)) || (!((PictureBox)sender).ClientRectangle.Contains(NewPoint.X, NewPoint.Y - 5)))
{
if (mouseDrag)
{
mouseMove = false;
return;
}
}
{
wireObject1.MovePoint(selectedIndex, NewPoint, NewPoint); // when moving a point dragging the other point is vanished deleted. To check why !
label1.Text = "{X = " + NewPoint.X + "}" + " " + "{Y = " + NewPoint.Y + "}";
pictureBox1.Refresh();
}
}
else
{
label19.Text = "{X = " + e.X + "}" + " " + "{Y = " + e.Y + "}";
}
}