我有主要的表单，其中有 tabcontrol 和 menustrip。在 menustrip 中，有几个按钮可以打开 tabcontrol 中的标签页，其中包含定义的名称和透视图，以用自己的内容填充它。但是关闭标签页的功能也应该存在。我的想法不是使用不同的按钮，而是在标签页标题上使用特殊按钮。显然，这将是一些带有交叉成像的图片。
我使用了tabcontrol DrawMode=OwnerDrawFixed 的属性。尽管目录和文件名正确，但标签页标题中没有图片。它位于exe文件所在的文件夹中。标题中也没有标签，而标题的宽度证明文本存在但不可见。
public partial class Core : Form
{
private string closeButtonFullPath = "button-close.png";
public Core()
{
InitializeComponent();
}
// Do not forget this namespace or else DllImport won't work
[DllImport("user32.dll")]
private static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wp, IntPtr lp);
private const int TCM_SETMINTABWIDTH = 0x1300 + 49;
private void tabControl1_HandleCreated(object sender, EventArgs e)
{
SendMessage(this.tabControl1.Handle, TCM_SETMINTABWIDTH, IntPtr.Zero, (IntPtr)16);
}
private void tabControl_DrawItem(object sender, DrawItemEventArgs e)
{
try
{
var tabPage = this.tabControl1.TabPages[e.Index];
var tabRect = this.tabControl1.GetTabRect(e.Index);
tabRect.Inflate(-2, -2);
var closeImage = new Bitmap(closeButtonFullPath);
e.Graphics.DrawImage(closeImage,
(tabRect.Right - closeImage.Width),
tabRect.Top + (tabRect.Height - closeImage.Height) / 2);
TextRenderer.DrawText(e.Graphics, tabPage.Text, tabPage.Font,
tabRect, tabPage.ForeColor, TextFormatFlags.Left);
}
catch (Exception ex) { throw new Exception(ex.Message); }
}
private void списокПерсонToolStripMenuItem_Click(object sender, EventArgs e)
{
string texttab = "Список персон";
TabPage ListPersons = new TabPage(texttab);
tabControl1.TabPages.Add(ListPersons);
}
private void списокОрганізаційToolStripMenuItem_Click(object sender, EventArgs e)
{
TabPage tp = new TabPage();
tp.Name = "Tab_OrganizationList";
tabControl1.TabPages.Add(tp);
}
private void tabControl1_MouseDown(object sender, MouseEventArgs e)
{
for (var i = 0; i < this.tabControl1.TabPages.Count - 1; i++)
{
var tabRect = this.tabControl1.GetTabRect(i);
tabRect.Inflate(-2, -2);
var closeImage = new Bitmap(closeButtonFullPath);
var imageRect = new Rectangle(
(tabRect.Right - closeImage.Width),
tabRect.Top + (tabRect.Height - closeImage.Height) / 2,
closeImage.Width,
closeImage.Height);
if (imageRect.Contains(e.Location))
{
this.tabControl1.TabPages.RemoveAt(i);
break;
}
}
}
}