Tooltips显示图片
具体做法参见这篇文章,
还有相关的帮助链接.
需要注意的两点:
OwnerDraw属性设置为true;
IsBalloon属性不能设置为true;
我起初把IsBalloon设置为true,
结果图片怎么都显示不出来,
修改为False后,
图片顺利显示出来。
为防止链接失效,
把主要代码放在这里:
private const int Margin = 10; // Set the tooltip's bounds. private void tipButtons_Popup(object sender, PopupEventArgs e) { int image_wid = 2 * Margin + Properties.Resources.happy.Width; int image_hgt = 2 * Margin + Properties.Resources.happy.Height; int wid = e.ToolTipSize.Width + 2 * Margin + image_wid; int hgt = e.ToolTipSize.Height; if (hgt < image_hgt) hgt = image_hgt; e.ToolTipSize = new Size(wid, hgt); }
// Draw the tooltip. private void tipButtons_Draw(object sender, DrawToolTipEventArgs e) { // Draw the background and border. e.DrawBackground(); e.DrawBorder(); // Draw the image. e.Graphics.DrawImage(Properties.Resources.happy, Margin, Margin); // Draw the text. using (StringFormat sf = new StringFormat()) { sf.Alignment = StringAlignment.Near; sf.LineAlignment = StringAlignment.Center; int image_wid = 2 * Margin + Properties.Resources.happy.Width; Rectangle rect = new Rectangle(image_wid, 0, e.Bounds.Width - image_wid, e.Bounds.Height); e.Graphics.DrawString( e.ToolTipText, e.Font, Brushes.Green, rect, sf); } }
补充:
文本需要换行的话,
可以使用Environment.NewLine
例如:
this.toolTip1.SetToolTip(this.comboBox, "第一行文本," + Environment.NewLine + "第二行文本。");
行距如何控制,
尚未找到解决方法。