Apply parent mouse events to child elements

Question

I am making little Windows Forms Application.
\nI have PictureBox (parent) and Label (child) in it.

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The Parent\'s Mouse Events are working perfectly, but Mouse events generated by child elements are not reflected on the Parent. The Cursor also changes back to its default (arrow).

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Is it possible to pass events generated by child Controls, e.g., the MouseEnter event, to the Parent Control?

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public partial class Form1 : Form\n{\n    public Form1()\n    {\n        InitializeComponent();\n\n        Card.MouseEnter += new EventHandler(Card_MouseEnter);\n        Card.MouseLeave += new EventHandler(Card_MouseLeave);\n        Card.MouseDown += new MouseEventHandler(this.Card_MouseDown);\n        Card.MouseUp += new MouseEventHandler(this.Card_MouseUp);\n    }\n\n    void Card_MouseLeave(object sender, EventArgs e)\n    {\n        this.Card.BackgroundImage = ((System.Drawing.Image)(Properties.Resources.card_bg));\n        this.Rename("Running!");\n    }\n\n    void Card_MouseEnter(object sender, EventArgs e)\n    {\n        this.Card.BackgroundImage = ((System.Drawing.Image)(Properties.Resources.card_hover_bg));\n    }\n\n    private void Card_MouseDown(object sender, EventArgs e)\n    {\n        this.Card.BackgroundImage = ((System.Drawing.Image)(Properties.Resources.card_click_bg));\n    }\n\n    private void Card_MouseUp(object sender, EventArgs e)\n    {\n        this.Card.BackgroundImage = ((System.Drawing.Image)(Properties.Resources.card_hover_bg));\n        this.Rename("Please Wait...");\n    }\n\n    private void CardName_MouseDown(object sender, MouseEventArgs e)\n    {\n        \n    }\n\n    void Rename(string args)\n    {\n        this.CardName.Text = args;\n    }\n\n    private void CardName_Click(object sender, EventArgs e)\n    {\n\n    }\n}\n

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\xc2\xa0\xc2\xa0 \xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0\xc2\xa0

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            This is what I have                       This is what I want to achieve\n    \n

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The first animation represents what I have now, the second is what I need to achieve :)

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Answer 1

当我制作 pictureBox1.Controls.Add(label1) label1 时，label1 正在消失，我尝试将其置于前面并更改颜色，但无法做到这一点。如果您有任何想法，请向我展示我提供的代码，以便我可以理解。再次感谢大家:)

您可能会在表单的 Load() 事件中使用这样的代码：

private void Form1_Load(object sender, EventArgs e)
{
    Point pt = CardName.Parent.PointToScreen(CardName.Location);
    Card.Controls.Add(CardName);
    CardName.Location = Card.PointToClient(pt);
}

这使标签保持在与原来相同的位置，但使图片框成为父级。

不知道你哪里出错了。这是一个展示其实际效果的示例。PictureBox (Card) 和 Label (CardName) 均位于面板 (panel1) 内。单击按钮 2 可切换卡片的可见性。单击button1 使Card 成为CardName 的父级。您可以看到，一开始，只有 Card 切换可见性，但在单击 Button1 并设置 Parent 后，两者一起切换可见性，因为 CardName 是 Card 的子级（它还会更改其 BackColor 以匹配其新 Parent 的 BackColor）：

代码：

public partial class Form1 : Form
{

    private void button1_Click(object sender, EventArgs e)
    {
        Point pt = CardName.Parent.PointToScreen(CardName.Location);
        Card.Controls.Add(CardName);
        CardName.Location = Card.PointToClient(pt);
    }

    private void button2_Click(object sender, EventArgs e)
    {
        Card.Visible = !Card.Visible;
    }

}

当我将鼠标移到标签上时，面板认为鼠标离开了它并引发 MouseLeave 事件

下面是如何判断光标是否确实离开了面板的边界，而不是简单地在面板中输入子控件：

private void panel1_MouseEnter(object sender, EventArgs e)
{
    panel1.BackColor = Color.Red;
}

private void panel1_MouseLeave(object sender, EventArgs e)
{
    Point pt = panel1.PointToClient(Cursor.Position);
    if (!panel1.ClientRectangle.Contains(pt))
    {
        // we only get in here when the cursor leaves the BOUNDS of panel1
        panel1.BackColor = Control.DefaultBackColor;
    }            
}