Set TabPage Header Color

问题

Greetings,

I have a tab control and I want to have 1 of the tabs have it\'s text color changed on a event. I\'ve found answers like C# - TabPage Color event and C# Winform: How to set the Base Color of a TabControl (not the tabpage) but using these sets all colors instead of one.

So I was hoping there is a way to implement this with the tab I wish to change as a method instead of a event?

Something like:

public void SetTabPageHeaderColor(TabPage page, Color color) 
{
    //Text Here
}

回答1:

If you want to color the tabs, try the following code:

this.tabControl1.DrawMode = TabDrawMode.OwnerDrawFixed;
this.tabControl1.DrawItem += new System.Windows.Forms.DrawItemEventHandler(this.tabControl1_DrawItem);

private Dictionary<TabPage, Color> TabColors = new Dictionary<TabPage, Color>();
private void SetTabHeader(TabPage page, Color color)
{
    TabColors[page] = color;
    tabControl1.Invalidate();
}
private void tabControl1_DrawItem(object sender, DrawItemEventArgs e)
{
    //e.DrawBackground();
    using (Brush br = new SolidBrush (TabColors[tabControl1.TabPages[e.Index]]))
    {
        e.Graphics.FillRectangle(br, e.Bounds);
        SizeF sz = e.Graphics.MeasureString(tabControl1.TabPages[e.Index].Text, e.Font);
        e.Graphics.DrawString(tabControl1.TabPages[e.Index].Text, e.Font, Brushes.Black, e.Bounds.Left + (e.Bounds.Width - sz.Width) / 2, e.Bounds.Top + (e.Bounds.Height - sz.Height) / 2 + 1);

        Rectangle rect = e.Bounds;
        rect.Offset(0, 1);
        rect.Inflate(0, -1);
        e.Graphics.DrawRectangle(Pens.DarkGray, rect);
        e.DrawFocusRectangle();
    }
}

回答2:

For WinForms users reading this - This ONLY works if you set your tab control's DrawMode to OwnerDrawFixed - the DrawItem event never fires if it's set to Normal.

回答3:

To add to Fun Mun Pieng's answer which works beautifully on Horizontal tabs, if you were to use Vertical tabs (like I was) then you would need something like this:

    private void tabControl2_DrawItem(object sender, DrawItemEventArgs e)
    {
        using (Brush br = new SolidBrush(tabColorDictionary[tabControl2.TabPages[e.Index]]))
        {
            // Color the Tab Header
            e.Graphics.FillRectangle(br, e.Bounds);
            // swap our height and width dimensions
            var rotatedRectangle = new Rectangle(0, 0, e.Bounds.Height, e.Bounds.Width);

            // Rotate
            e.Graphics.ResetTransform();
            e.Graphics.RotateTransform(-90);

            // Translate to move the rectangle to the correct position.
            e.Graphics.TranslateTransform(e.Bounds.Left, e.Bounds.Bottom, System.Drawing.Drawing2D.MatrixOrder.Append);

            // Format String
            var drawFormat = new System.Drawing.StringFormat();
            drawFormat.Alignment = StringAlignment.Center;
            drawFormat.LineAlignment = StringAlignment.Center;

            // Draw Header Text
            e.Graphics.DrawString(tabControl2.TabPages[e.Index].Text, e.Font, Brushes.Black, rotatedRectangle, drawFormat);
        }
    }

I will echo the point that ROJO1969 made, if this is in WinForms - then you must set DrawMode to OwnerDrawFixed.

Special thanks goes out to this wonderful blog entry which described how to do a rotation of text on a form.

来源：https://stackoverflow.com/questions/5338587/set-tabpage-header-color

标签

winforms

colors

header

tabcontrol