做网站闵行,做电影网站要不要收费的,做网站工程案例图片,搭建本地网站说明#xff1a;通过WinApi可以准确定准滚动位置。 //行号 生成显示 这里rtbLineNum用的 RichTextBox#xff0c;也可以用其它private void ShowLineNum(){rtbLineNum.Text ;//计算行高#xff0c;行数int linesLength 0;var pFirst tbEditor.GetPositionFr… 说明通过WinApi可以准确定准滚动位置。
//行号 生成显示 这里rtbLineNum用的 RichTextBox也可以用其它private void ShowLineNum(){rtbLineNum.Text ;//计算行高行数int linesLength 0;var pFirst tbEditor.GetPositionFromCharIndex(0);var pEnd tbEditor.GetPositionFromCharIndex(tbEditor.Text.Length);if (pEnd.Y pFirst.Y){var pSecondLine tbEditor.GetPositionFromCharIndex(tbEditor.GetFirstCharIndexFromLine(1));var lineHeight pSecondLine.Y - pFirst.Y;linesLength (pEnd.Y - pFirst.Y) / lineHeight;}else{linesLength 1;}//生成行数for (var i 0; i linesLength; i){rtbLineNum.AppendText(i 1 \n);}//行号右对齐rtbLineNum.SelectAll();rtbLineNum.SelectionAlignment HorizontalAlignment.Right;}//上次滚动位置 行private int _scrollToLine 0;//同步滚动private void SyncSrollLocation(){ //利用winApi 同步滚动条位置var pos GetScrollPos(tbEditor.Handle, SB_VERT);SetScrollPos(rtbLineNum.Handle, SB_VERT, pos, true);PostMessage(rtbLineNum.Handle, WM_VSCROLL, SB_THUMBPOSITION 0x10000 * pos, 0);}//编辑器 Resize事件private void tbEditor_Resize(object sender, EventArgs e){ShowLineNum();SyncSrollLocation();}//编辑器 TextChanged事件private void tbEditor_TextChanged(object sender, EventArgs e){ShowLineNum();SyncSrollLocation();}//编辑器 VScroll事件private void tbEditor_VScroll(object sender, EventArgs e){SyncSrollLocation();}private const int SB_VERT 0x1;private const int WM_VSCROLL 0x115;private const int SB_THUMBPOSITION 4;[DllImport(user32.dll)]private static extern int SetScrollPos(IntPtr hwnd, int nBar, int nPos, bool bRedraw);[DllImport(user32.dll)]private static extern int GetScrollPos(IntPtr hwnd, int nBar);[DllImport(user32.dll)]private static extern bool PostMessage(IntPtr hWnd, int nBar, int wParam, int lParam);
