如何更改richtextbox的所有內容的字體而不會丟失格式？更改richtextbox的字體而不會丟失格式化
我想使用
rtb.SelectAll();
rtb.SelectionFont = new Font(fontName,...);
但字體構造必須採取除了字體類型無論是字體樣式（粗體，斜體，...）或字體大小。 因此，使用這將改變richtextbox的所有內容的風格/大小。
當然這同樣適用於richtextbox中的任何選擇。
這是我以前用過的RichTextBox。從這兒發現的堆棧溢出代碼和互聯網拼接在一起，在大：
public class RichBox : RichTextBox {
private const UInt32 CFM_BOLD = 0x00000001;
private const UInt32 CFM_ITALIC = 0x00000002;
private const UInt32 CFM_UNDERLINE = 0x00000004;
private const UInt32 CFM_STRIKE = 0x00000008;
private const UInt32 CFM_FACE = 0x20000000;
private const UInt32 CFM_SIZE = 0x80000000;
private const int WM_PAINT = 0xF;
private const int WM_SETREDRAW = 0xB;
private const int WM_USER = 0x400;
private const int EM_SETCHARFORMAT = (WM_USER + 68);
private const int SCF_SELECTION = 0x0001;
private const int EM_GETEVENTMASK = WM_USER + 59;
private const int EM_SETEVENTMASK = WM_USER + 69;
private const int EM_GETSCROLLPOS = WM_USER + 221;
private const int EM_SETSCROLLPOS = WM_USER + 222;
[StructLayout(LayoutKind.Sequential)]
private struct CHARFORMAT {
public int cbSize;
public uint dwMask;
public uint dwEffects;
public int yHeight;
public int yOffset;
public int crTextColor;
public byte bCharSet;
public byte bPitchAndFamily;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)]
public char[] szFaceName;
public short wWeight;
public short sSpacing;
public int crBackColor;
public int LCID;
public uint dwReserved;
public short sStyle;
public short wKerning;
public byte bUnderlineType;
public byte bAnimation;
public byte bRevAuthor;
}
[DllImport("kernel32.dll", CharSet = CharSet.Auto)]
private static extern IntPtr LoadLibrary(string lpFileName);
[DllImport("user32", CharSet = CharSet.Auto)]
private static extern int SendMessage(IntPtr hWnd, int msg, int wParam, ref CHARFORMAT lParam);
[DllImport("user32.dll")]
private static extern IntPtr SendMessage(IntPtr hWnd, Int32 wMsg, Int32 wParam, ref Point lParam);
[DllImport("user32.dll")]
private static extern IntPtr SendMessage(IntPtr hWnd, Int32 wMsg, Int32 wParam, IntPtr lParam);
private bool frozen = false;
private Point lastScroll = Point.Empty;
private IntPtr lastEvent = IntPtr.Zero;
private int lastIndex = 0;
private int lastWidth = 0;
protected override CreateParams CreateParams {
get {
var cp = base.CreateParams;
if (LoadLibrary("msftedit.dll") != IntPtr.Zero) {
cp.ClassName = "RICHEDIT50W";
}
return cp;
}
}
[Browsable(false)]
[DefaultValue(typeof(bool), "False")]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public bool FreezeDrawing {
get { return frozen; }
set {
if (value != frozen) {
frozen = value;
if (frozen) {
this.SuspendLayout();
SendMessage(this.Handle, WM_SETREDRAW, 0, IntPtr.Zero);
SendMessage(this.Handle, EM_GETSCROLLPOS, 0, ref lastScroll);
lastEvent = SendMessage(this.Handle, EM_GETEVENTMASK, 0, IntPtr.Zero);
lastIndex = this.SelectionStart;
lastWidth = this.SelectionLength;
} else {
this.Select(lastIndex, lastWidth);
SendMessage(this.Handle, EM_SETEVENTMASK, 0, lastEvent);
SendMessage(this.Handle, EM_SETSCROLLPOS, 0, ref lastScroll);
SendMessage(this.Handle, WM_SETREDRAW, 1, IntPtr.Zero);
this.Invalidate();
this.ResumeLayout();
}
}
}
}
[Browsable(false)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public Font CurrentFont {
get {
Font result = this.Font;
if (this.SelectionLength == 0) {
result = SelectionFont;
} else {
using (RichBox rb = new RichBox()) {
rb.FreezeDrawing = true;
rb.SelectAll();
rb.SelectedRtf = this.SelectedRtf;
rb.Select(0, 1);
result = rb.SelectionFont;
}
}
return result;
}
}
[Browsable(false)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public string SelectionFontName {
get { return CurrentFont.FontFamily.Name; }
set {
CHARFORMAT cf = new CHARFORMAT();
cf.cbSize = Marshal.SizeOf(cf);
cf.szFaceName = new char[32];
cf.dwMask = CFM_FACE;
value.CopyTo(0, cf.szFaceName, 0, Math.Min(31, value.Length));
IntPtr lParam = Marshal.AllocCoTaskMem(Marshal.SizeOf(cf));
Marshal.StructureToPtr(cf, lParam, false);
SendMessage(this.Handle, EM_SETCHARFORMAT, SCF_SELECTION, lParam);
}
}
[Browsable(false)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public float SelectionFontSize {
get { return CurrentFont.Size; }
set {
CHARFORMAT cf = new CHARFORMAT();
cf.cbSize = Marshal.SizeOf(cf);
cf.dwMask = CFM_SIZE;
cf.yHeight = Convert.ToInt32(value * 20);
IntPtr lParam = Marshal.AllocCoTaskMem(Marshal.SizeOf(cf));
Marshal.StructureToPtr(cf, lParam, false);
SendMessage(this.Handle, EM_SETCHARFORMAT, SCF_SELECTION, lParam);
}
}
[Browsable(false)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public bool SelectionBold {
get { return CurrentFont.Bold; }
set {
CHARFORMAT cf = new CHARFORMAT();
cf.cbSize = Marshal.SizeOf(cf);
cf.dwMask = CFM_BOLD;
cf.dwEffects = value ? CFM_BOLD : 0;
IntPtr lParam = Marshal.AllocCoTaskMem(Marshal.SizeOf(cf));
Marshal.StructureToPtr(cf, lParam, false);
SendMessage(this.Handle, EM_SETCHARFORMAT, SCF_SELECTION, lParam);
}
}
[Browsable(false)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public bool SelectionItalic {
get { return CurrentFont.Italic; }
set {
CHARFORMAT cf = new CHARFORMAT();
cf.cbSize = Marshal.SizeOf(cf);
cf.dwMask = CFM_ITALIC;
cf.dwEffects = value ? CFM_ITALIC : 0;
IntPtr lParam = Marshal.AllocCoTaskMem(Marshal.SizeOf(cf));
Marshal.StructureToPtr(cf, lParam, false);
SendMessage(this.Handle, EM_SETCHARFORMAT, SCF_SELECTION, lParam);
}
}
[Browsable(false)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public bool SelectionStrikeout {
get { return CurrentFont.Strikeout; }
set {
CHARFORMAT cf = new CHARFORMAT();
cf.cbSize = Marshal.SizeOf(cf);
cf.dwMask = CFM_STRIKE;
cf.dwEffects = value ? CFM_STRIKE : 0;
IntPtr lParam = Marshal.AllocCoTaskMem(Marshal.SizeOf(cf));
Marshal.StructureToPtr(cf, lParam, false);
SendMessage(this.Handle, EM_SETCHARFORMAT, SCF_SELECTION, lParam);
}
}
[Browsable(false)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public bool SelectionUnderline {
get { return CurrentFont.Underline; }
set {
CHARFORMAT cf = new CHARFORMAT();
cf.cbSize = Marshal.SizeOf(cf);
cf.dwMask = CFM_UNDERLINE;
cf.dwEffects = value ? CFM_UNDERLINE : 0;
IntPtr lParam = Marshal.AllocCoTaskMem(Marshal.SizeOf(cf));
Marshal.StructureToPtr(cf, lParam, false);
SendMessage(this.Handle, EM_SETCHARFORMAT, SCF_SELECTION, lParam);
}
}
}
它增加了新的特性，如SelectionBold，SelectionItalic等在那裏你可以應用屬性，而不是失去文本的其他格式。
完美！謝謝 – Jerry 2013-04-30 20:20:36
嗨LarsTech，有時當我改變包含粗體的大選擇的字體時，粗體會丟失。當我點擊ctrl + Z一次時，粗體被恢復。你有一個想法，爲什麼會發生這種情況？謝謝 – Jerry 2013-06-11 21:49:12
@Jerry如果您要更改'SelectionFont'屬性，那麼是的，您正在告訴文檔將所有字體屬性替換爲新字體。要更改字體但保留屬性，請改爲使用「SelectionFontName」或「SelectionFontSize」屬性。另外，Ctrl-Z是撤消功能。 – LarsTech 2013-06-17 13:25:24
您可以傳入所需的任何參數的新值，並使用rtb屬性來保留其他值。例如，如果你想改變font family但希望保留font size，這是你會怎麼做：
rtb.SelectionFont = new Font(fontName, rtb.Font.Size);
這將SelectionFont家庭改變fontName但保留的字體大小。對於其他重載，您可以遵循相同的模式。
但是，如果有不同的字體大小，這將無法正常工作。 – Jerry 2013-04-30 18:15:07
你是什麼意思不同的字體大小？解釋你想要達成的目標，然後或許我們可以搞清楚。 – PoweredByOrange 2013-04-30 18:18:27
具有不同字體大小的不同文本。無論如何，即使你的答案導致字體樣式改變。 – Jerry 2013-04-30 18:20:33
通過使用現有的richtextbox字體屬性，您可以傳遞新的字體名稱，同時保持其他值不變。爲了改變選中的文本隻字體的名稱，你需要做的：
if (rtb.SelectionFont !=null)
rtb.SelectionFont = new Font(fontName, rtb.SelectionFont.Size, rtb.SelectionFont.Style);
注意，上面的代碼只會工作，如果所有選定的文本具有相同的格式（字體大小，樣式等）。這可以通過首先檢查SelectionFont屬性來檢測，如果選擇包含樣式組合，則它將爲null。
現在要更改richtextbox所有內容的字體名稱，同時保持其他格式不變，您需要遍歷richtextbox的所有字符並逐個應用字體名稱。
for (int i = 0; i < rtb.TextLength; i++)
{
rtb.Select(i, 1);
rtb.SelectionFont = new Font(fontName, rtb.SelectionFont.Size, rtb.SelectionFont.Style);
}
Private Sub changeFont(ByVal fontz As FontStyle, getStr As RichTextBox)
Dim currentFont As System.Drawing.Font = txt.SelectionFont
Dim newFontStyle As System.Drawing.FontStyle
newFontStyle = fontz
getStr.SelectionFont = New Font(currentFont.FontFamily, currentFont.Size, newFontStyle)
End Sub
這將改變所選文本的字體屬性。
樣品：[？我如何保持改變任何一個元素時富文本格式（粗體/斜體/等）
changeFont(FontStyle.Italic, [textbox_name])
見（http://stackoverflow.com/q/5325918/719186）。最終，禁令可能是最好的解決方案。 – LarsTech 2013-04-30 18:21:49
你可以在pinvoking更清晰？ – Jerry 2013-04-30 18:27:20