更改winform ToolTip backcolor

Question

I am using a ToolTip control in my project. I want to set its backcolor red. I have changed ownerdraw property to true and backcolor to red. But no result. Any suggestion?

Regards, skpaul.

Answer 1

Set these propeties:

yourTooltip.OwnerDraw = true; 
yourTooltip.BackColor = System.Drawing.Color.Red;

then on the Draw event use this :

private void yourTooltip_Draw(object sender, DrawToolTipEventArgs e)
{
    e.DrawBackground();
    e.DrawBorder();
    e.DrawText();
}

Answer 2

Add Event to toolstrip and set OwnerDraw to true:

public Form1() {
     InitializeComponent();
     toolTip1.OwnerDraw = true;
     toolTip1.Draw += new DrawToolTipEventHandler(toolTip1_Draw);          
 }

Then do add a method for Draw Event:

void toolTip1_Draw(object sender, DrawToolTipEventArgs e) {
     Font f = new Font("Arial", 10.0f);
     toolTip1.BackColor = System.Drawing.Color.Red;
     e.DrawBackground();
     e.DrawBorder();
     e.Graphics.DrawString(e.ToolTipText, f, Brushes.Black, new PointF(2, 2));
 }

Answer 3

When you set a Control to OwnerDraw, you have to handle the drawing of the control yourself.

Here's a quick and dirty example (adapt to your taste):

Private Sub ToolTip1_Draw(sender As Object, e As DrawToolTipEventArgs) Handles ToolTip1.Draw
    Dim tt As ToolTip = CType(sender, ToolTip)
    Dim b As Brush = New SolidBrush(tt.BackColor)

    e.Graphics.FillRectangle(b, e.Bounds)

    Dim sf As StringFormat = New StringFormat
    sf.Alignment = StringAlignment.Center
    sf.LineAlignment = StringAlignment.Center
    e.Graphics.DrawString(e.ToolTipText, SystemFonts.DefaultFont, SystemBrushes.ActiveCaptionText, e.Bounds, sf)

    sf.Dispose()
    b.Dispose()
End Sub

Cheers