Question

我的表格中有一张较小的图片。当用户将鼠标悬停在图像上时，它会显示更大的图像视图（跟随鼠标，但与鼠标保持一定距离）。为了做到这一点，我在光标悬停图像时生成一个没有FormBorderStyles的Form。

我遇到的问题是，一旦表单激活，第一个表单似乎不再检测到鼠标悬停或离开PictureBox。表格也不跟随光标。

这是我所得到的精简版：

C＃

    bool formOpen = false;
    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        pictureBox1.MouseHover += pictureBox1_MouseHover;
        pictureBox1.MouseLeave +=pictureBox1_MouseLeave;
    }

    void pictureBox1_MouseHover(object sender, EventArgs e)
    {
        if (formOpen == false)
        {
            Form form = new Form();
            form.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
            form.BackColor = Color.Orchid;
            //Show the form
            form.Show();
            form.Name = "imageForm";
            this.AddOwnedForm(form);

            //Set event handler for when the mouse leaves the image area.
            //form.MouseLeave += form_MouseLeave;
            //Set the location of the form and size
            form.BackColor = Color.Black;
            form.Dock = DockStyle.Fill;
            form.Size = new Size(30, 30);
            form.BackgroundImageLayout = ImageLayout.Center;
            this.TopMost = true;
            formOpen = true;

            form.Location = new Point(Cursor.Position.X, Cursor.Position.Y);
        }
    }


    private void pictureBox1_MouseLeave(object sender, EventArgs e)
    {
        //MessageBox.Show("Worked");
    }
}

Answer 1

MouseLeave（以及其他事件）无法识别，因为弹出窗口的打开，特别是使其topmost=true从原始表单及其PictureBox中删除焦点。 / p>

它也没有移动，因为没有提供移动代码..

以下是一些将使表单移动的更改：

您需要form1级
您需要在MouseMove活动

请注意，Hover是一次性事件。它只会触发一次直到您离开控件..（注意：Setsu已从Hover切换到Enter。这样可以正常工作，但在显示第二个之前没有短暂的延迟表格。如果你想要回来，你可以切换回Hover，或者你可以用Timer伪造悬停延迟，这是我经常做的。）

// class level variable 
Form form;

private void Form1_Load(object sender, EventArgs e)
{
    pictureBox1.MouseEnter += pictureBox1_MouseEnter;
    pictureBox1.MouseLeave +=pictureBox1_MouseLeave;
    pictureBox1.MouseMove += pictureBox1_MouseMove;  // here we move the form..
}

// .. with a little offset. The exact numbers depend on the cursor shape
void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
    if ((form != null) && form.Visible)
    {
        form.Location = new Point(Cursor.Position.X + 5, Cursor.Position.Y + 5);
    }
}

void pictureBox1_MouseEnter(object sender, EventArgs e)
{
    // we create it only once. Could also be done at startup!
    if (form == null)
    {
         form = new Form();
         form.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
         //form.BackColor = Color.Orchid;
         form.Name = "imageForm";
         this.AddOwnedForm(form);
         form.BackColor = Color.Black;
         form.Dock = DockStyle.Fill;
         form.Size = new Size(30, 30);
         form.BackgroundImageLayout = ImageLayout.Center;
         //this.TopMost = true;  // wrong! this will steal the focus!!
         form.ShowInTaskbar = false;
    }
    // later we only show and update it..
    form.Show();
    form.Location = new Point(Cursor.Position.X + 5, Cursor.Position.Y + 5);
    // we want the Focus to be on the main form!
    Focus();
}

private void pictureBox1_MouseLeave(object sender, EventArgs e)
{
    if (form!= null) form.Hide();
}

Answer 2

MouseHover =鼠标指针停留在控件上时发生。 (msdn)

尝试使用MouseMove。

MouseLeave检测不能与ImageForm一起使用

2 个答案: