MouseEnter和MouseLeave事件似乎很慢

debugcn 发表于 Dev

XenLife

当我尝试更改“面板”和“标签”的背景颜色时，它们似乎彼此之间的变化速度稍慢。
尽管两者都设置为在“面板”和“标签”的“输入/离开”时都进行更改，但是我发现更改时仅相差了半秒。

有人知道我如何才能让它们在相同的时间同时更改，而不管鼠标在哪一个上？

private void panel3_MouseEnter(object sender, EventArgs e)
{
    panel3.BackColor = Color.FromArgb(125, 170, 170, 170);
    label2.BackColor = System.Drawing.Color.Transparent;
}

private void panel3_MouseLeave(object sender, EventArgs e)
{
    panel3.BackColor = Color.FromArgb(125, 45, 45, 45);
    label2.BackColor = System.Drawing.Color.Transparent;
}

private void label2_MouseEnter(object sender, EventArgs e)
{
    panel3.BackColor = Color.FromArgb(125, 170, 170, 170);
    label2.BackColor = System.Drawing.Color.Transparent;
}

private void label2_MouseLeave(object sender, EventArgs e)
{
    panel3.BackColor = Color.FromArgb(125, 45, 45, 45);
    label2.BackColor = System.Drawing.Color.Transparent;
}

这是它在做什么的一个例子。例

用户名

我认为由于背景图像/父容器的绘制，您将不断出现这种闪烁，正如我从您的Example中看到的那样。请考虑通过子类使用双缓冲控件以减少闪烁。

class DBPanel : Panel
{
    public DBPanel()
    {
        DoubleBuffered = true;
    }
}

当您尝试创建类似的GUI时，我建议创建一个自定义控件，该控件将面板和标签结合在一起，并且还支持双缓冲。

例：

class FancyLabel : Panel
{

    private bool IsMouseEntered;

    public FancyLabel()
    {
        SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint | ControlStyles.OptimizedDoubleBuffer | ControlStyles.SupportsTransparentBackColor, true);
        DoubleBuffered = true;
        UpdateStyles();
        BackColor = Color.Transparent;
        ForeColor = Color.FromArgb(205, 205, 205);
    }

    protected override void OnMouseEnter(EventArgs e)
    {
        base.OnMouseEnter(e);
        IsMouseEntered = true;
        Invalidate();
    }

    protected override void OnMouseLeave(EventArgs e)
    {
        base.OnMouseLeave(e);
        IsMouseEntered = false;
        Invalidate();
    }

    [System.ComponentModel.Bindable(true)]
    [System.ComponentModel.Browsable(true)]
    public override string Text { get => base.Text; set => base.Text = value; }

    protected override void OnTextChanged(EventArgs e)
    {
        base.OnTextChanged(e);
        Invalidate();
    }

    protected override void OnPaint(PaintEventArgs e)
    {
        base.OnPaint(e);

        Graphics G = e.Graphics;
        G.SmoothingMode = SmoothingMode.HighQuality;
        G.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;

        SolidBrush bkBrush = IsMouseEntered ? new SolidBrush(Color.FromArgb(125, 170, 170, 170)) : new SolidBrush(Color.FromArgb(125, 45, 45, 45));

        Rectangle rec = new Rectangle(0, 0, Width - 1, Height - 1);

        G.FillRectangle(bkBrush, rec);

        SolidBrush txtBrush = new SolidBrush(ForeColor);
        StringFormat sf = new StringFormat() { Alignment = StringAlignment.Center, LineAlignment = StringAlignment.Center };

        G.DrawString(Text, Font, txtBrush, rec, sf);

        bkBrush.Dispose();
        txtBrush.Dispose();
        sf.Dispose();
    }
}

祝好运。

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