Question

我有一个带有组合的表单来接收客户和按钮。选择客户并将鼠标移到按钮上时，将显示工具提示，其中包含有关此客户的信息。

我使用ToolTip_Draw定制了工具提示。

所有这些都很好。

问题在于，当我更改所选客户，然后将鼠标移到按钮上时，会显示几个工具提示文本。我之前选择的每个客户都有一个。

我试图以某种方式清空de ToolTip，但似乎没有任何效果。

private void bttCitas_MouseHover(object sender, EventArgs e)
{
    string mSQL = @"    SELECT one, two, three
            FROM customers
            WHERE id = " + comboCliente.SelectedValue + ";";
    DataTable tablaTemp = retrieveData(mSQL);

    string customerText = ConvertDataTableToString(tablaTemp);
    System.Windows.Forms.ToolTip Emergente = new System.Windows.Forms.ToolTip();
    Emergente.OwnerDraw = true; 
    Emergente.Draw += new DrawToolTipEventHandler(ToolTip_Draw);
    Emergente.AutoPopDelay = 150000;
    Emergente.InitialDelay = 500;
    Emergente.ReshowDelay = 500;
    Emergente.SetToolTip(this.bttCitas, customerText);            
}


void ToolTip_Draw(object sender, DrawToolTipEventArgs e)
{
    using (e.Graphics)
    {
        Font f = new Font("Courier New", 9.0f);
        e.DrawBackground();

        e.DrawBorder();
        SolidBrush myBrush = new SolidBrush(GLOBALToolTipFontColor);                
        e.Graphics.DrawString(e.ToolTipText, f, myBrush, new PointF(2, 2));
    }
}

Answer 1

我终于弄明白了会发生什么。

我需要从MouseOver事件中声明Emergente，然后将它放在MouseLeave中：

private ToolTip Emergente; 

private void bttCitas_MouseHover(object sender, EventArgs e)
{
    string mSQL = @"    SELECT one, two, three
            FROM customers
            WHERE id = " + comboCliente.SelectedValue + ";";
    DataTable tablaTemp = retrieveData(mSQL);

    string customerText = ConvertDataTableToString(tablaTemp);
    Emergente = new System.Windows.Forms.ToolTip();
    Emergente.OwnerDraw = true; 
    Emergente.Draw += new DrawToolTipEventHandler(ToolTip_Draw);
    Emergente.AutoPopDelay = 150000;
    Emergente.InitialDelay = 500;
    Emergente.ReshowDelay = 500;
    Emergente.SetToolTip(this.bttCitas, customerText);            
}


void ToolTip_Draw(object sender, DrawToolTipEventArgs e)
{
    using (e.Graphics)
    {
        Font f = new Font("Courier New", 9.0f);
        e.DrawBackground();

        e.DrawBorder();
        SolidBrush myBrush = new SolidBrush(GLOBALToolTipFontColor);                
        e.Graphics.DrawString(e.ToolTipText, f, myBrush, new PointF(2, 2));
    }
}


private void bttCitas_MouseLeave(object sender, EventArgs e)
{
        Emergente.Dispose(); 
}

使用MouseOver事件时会显示几个工具提示文本

1 个答案: