前言
作者：浪子花梦，一个有趣的程序员 ~
此文章将完成 格式菜单中的所有功能：自动换行的一些绑定、字体的选择功能
前文如下所示：
【WPF高仿 Windows记事本】开发日记 (一) UI布局(帮助菜单功能实现)
【WPF高仿 Windows记事本】开发日记 (二) 初步使用MVVM模式设计 帮助菜单 的三个命令
【WPF高仿 Windows记事本】开发日记 (三) 完善所有菜单的命令绑定并创建Models层的设计
【WPF高仿 Windows记事本】开发日记 (四) 菜单命令快捷键实现，实现查看菜单功能（三层架构初步使用）
【WPF高仿 Windows记事本】开发日记 (五) 使用成熟的自动更新代码(ObservableObject)、实现是否显示状态栏功能、鼠标的滚轮命令绑定(查看菜单功能实现)
此文章的实现效果如下所示：
格式菜单功能实现
1）DocumentModel 数据层 数据准备，用于记录当前是否自动换行，也用于滚动条的绑定：
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2）多值转换器的准备，分别将 Boolean类型转换为TextWrapping，ScrollBarVisibility 类型：
BooleanScrollBarVisibilityConverter 类的代码如下所示：
BooleanTextWrappingConverter 类的代码如下所示：
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3）UI 层进行数据的绑定：
绑定菜单上面的数据：
对文本框的属性进行绑定（自动换行，滚动条）：
自动换行的菜单功能已经实现 . . .
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4）实现字体菜单的功能，Win32API 准备：
需要定义这个API，我们还需要其它的一些数据的定义，代码如下所示：
// if we specify CharSet.Auto instead of CharSet.Ansi, then the string will be unreadable
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public class LOGFONT
{
public int lfHeight;
public int lfWidth;
public int lfEscapement;
public int lfOrientation;
public FontWeight lfWeight;
[MarshalAs(UnmanagedType.U1)]
public bool lfItalic;
[MarshalAs(UnmanagedType.U1)]
public bool lfUnderline;
[MarshalAs(UnmanagedType.U1)]
public bool lfStrikeOut;
public FontCharSet lfCharSet;
public FontPrecision lfOutPrecision;
public FontClipPrecision lfClipPrecision;
public FontQuality lfQuality;
public FontPitchAndFamily lfPitchAndFamily;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
public string lfFaceName;
public override string ToString()
{
StringBuilder sb = new StringBuilder();
sb.Append("LOGFONT\n");
sb.AppendFormat(" lfHeight: {0}\n", lfHeight);
sb.AppendFormat(" lfWidth: {0}\n", lfWidth);
sb.AppendFormat(" lfEscapement: {0}\n", lfEscapement);
sb.AppendFormat(" lfOrientation: {0}\n", lfOrientation);
sb.AppendFormat(" lfWeight: {0}\n", lfWeight);
sb.AppendFormat(" lfItalic: {0}\n", lfItalic);
sb.AppendFormat(" lfUnderline: {0}\n", lfUnderline);
sb.AppendFormat(" lfStrikeOut: {0}\n", lfStrikeOut);
sb.AppendFormat(" lfCharSet: {0}\n", lfCharSet);
sb.AppendFormat(" lfOutPrecision: {0}\n", lfOutPrecision);
sb.AppendFormat(" lfClipPrecision: {0}\n", lfClipPrecision);
sb.AppendFormat(" lfQuality: {0}\n", lfQuality);
sb.AppendFormat(" lfPitchAndFamily: {0}\n", lfPitchAndFamily);
sb.AppendFormat(" lfFaceName: {0}\n", lfFaceName);
return sb.ToString();
}
}
public enum FontWeight : int
{
FW_DONTCARE = 0,
FW_THIN = 100,
FW_EXTRALIGHT = 200,
FW_LIGHT = 300,
FW_NORMAL = 400,
FW_MEDIUM = 500,
FW_SEMIBOLD = 600,
FW_BOLD = 700,
FW_EXTRABOLD = 800,
FW_HEAVY = 900,
}
public enum FontCharSet : byte
{
ANSI_CHARSET = 0,
DEFAULT_CHARSET = 1,
SYMBOL_CHARSET = 2,
SHIFTJIS_CHARSET = 128,
HANGEUL_CHARSET = 129,
HANGUL_CHARSET = 129,
GB2312_CHARSET = 134,
CHINESEBIG5_CHARSET = 136,
OEM_CHARSET = 255,
JOHAB_CHARSET = 130,
HEBREW_CHARSET = 177,
ARABIC_CHARSET = 178,
GREEK_CHARSET = 161,
TURKISH_CHARSET = 162,
VIETNAMESE_CHARSET = 163,
THAI_CHARSET = 222,
EASTEUROPE_CHARSET = 238,
RUSSIAN_CHARSET = 204,
MAC_CHARSET = 77,
BALTIC_CHARSET = 186,
}
public enum FontPrecision : byte
{
OUT_DEFAULT_PRECIS = 0,
OUT_STRING_PRECIS = 1,
OUT_CHARACTER_PRECIS = 2,
OUT_STROKE_PRECIS = 3,
OUT_TT_PRECIS = 4,
OUT_DEVICE_PRECIS = 5,
OUT_RASTER_PRECIS = 6,
OUT_TT_ONLY_PRECIS = 7,
OUT_OUTLINE_PRECIS = 8,
OUT_SCREEN_OUTLINE_PRECIS = 9,
OUT_PS_ONLY_PRECIS = 10,
}
public enum FontClipPrecision : byte
{
CLIP_DEFAULT_PRECIS = 0,
CLIP_CHARACTER_PRECIS = 1,
CLIP_STROKE_PRECIS = 2,
CLIP_MASK = 0xf,
CLIP_LH_ANGLES = (1 << 4),
CLIP_TT_ALWAYS = (2 << 4),
CLIP_DFA_DISABLE = (4 << 4),
CLIP_EMBEDDED = (8 << 4),
}
public enum FontQuality : byte
{
DEFAULT_QUALITY = 0,
DRAFT_QUALITY = 1,
PROOF_QUALITY = 2,
NONANTIALIASED_QUALITY = 3,
ANTIALIASED_QUALITY = 4,
CLEARTYPE_QUALITY = 5,
CLEARTYPE_NATURAL_QUALITY = 6,
}
[Flags]
public enum FontPitchAndFamily : byte
{
DEFAULT_PITCH = 0,
FIXED_PITCH = 1,
VARIABLE_PITCH = 2,
FF_DONTCARE = (0 << 4),
FF_ROMAN = (1 << 4),
FF_SWISS = (2 << 4),
FF_MODERN = (3 << 4),
FF_SCRIPT = (4 << 4),
FF_DECORATIVE = (5 << 4),
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct CHOOSEFONT
{
public int lStructSize;
public IntPtr hwndOwner;
public IntPtr hDC;
public IntPtr lpLogFont;
public int iPointSize;
public int Flags;
public int rgbColors;
public IntPtr lCustData;
public IntPtr lpfnHook;
public string lpTemplateName;
public IntPtr hInstance;
public string lpszStyle;
public short nFontType;
private short __MISSING_ALIGNMENT__;
public int nSizeMin;
public int nSizeMax;
}
[Flags]
public enum CHOOSEFONTFLAGS
{
CF_SCREENFONTS = 0x00000001,
CF_PRINTERFONTS = 0x00000002,
CF_BOTH = (CF_SCREENFONTS | CF_PRINTERFONTS),
CF_SHOWHELP = 0x00000004,
CF_ENABLEHOOK = 0x00000008,
CF_ENABLETEMPLATE = 0x00000010,
CF_ENABLETEMPLATEHANDLE = 0x00000020,
CF_INITTOLOGFONTSTRUCT = 0x00000040,
CF_USESTYLE = 0x00000080,
CF_EFFECTS = 0x00000100,
CF_APPLY = 0x00000200,
CF_ANSIONLY = 0x00000400,
CF_SCRIPTSONLY = CF_ANSIONLY,
CF_NOVECTORFONTS = 0x00000800,
CF_NOOEMFONTS = CF_NOVECTORFONTS,
CF_NOSIMULATIONS = 0x00001000,
CF_LIMITSIZE = 0x00002000,
CF_FIXEDPITCHONLY = 0x00004000,
CF_WYSIWYG = 0x00008000,
CF_FORCEFONTEXIST = 0x00010000,
CF_SCALABLEONLY = 0x00020000,
CF_TTONLY = 0x00040000,
CF_NOFACESEL = 0x00080000,
CF_NOSTYLESEL = 0x00100000,
CF_NOSIZESEL = 0x00200000,
CF_SELECTSCRIPT = 0x00400000,
CF_NOSCRIPTSEL = 0x00800000,
CF_NOVERTFONTS = 0x01000000,
CF_INACTIVEFONTS = 0x02000000
}
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5）DocumentModel 数据层的数据准备：
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6）UI层的文本框与数据层作绑定：
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7）字体命令实现（OnFontCommand）：
private void OnFontCommand()
{
FontStyle fontStyle = FontStyle.Regular;
// 获取当前字体的风格、宽度
if (DocumentModel.FontStyle == "Italic") { fontStyle |= FontStyle.Italic; }
if (DocumentModel.FontWeight == "Bold") { fontStyle |= FontStyle.Bold; }
// 以当前字体代表的信息生成一种字体
Font font = new Font(DocumentModel.FontFamily, (float)DocumentModel.FontSize, fontStyle, GraphicsUnit.World, 0, false);
LOGFONT logfont = new LOGFONT();
font.ToLogFont(logfont);
IntPtr pLogfont = Marshal.AllocHGlobal(Marshal.SizeOf(logfont));
Marshal.StructureToPtr(logfont, pLogfont, false);
CHOOSEFONT choosefont = new CHOOSEFONT();
choosefont.lStructSize = Marshal.SizeOf(choosefont);
choosefont.hwndOwner = Process.GetCurrentProcess().MainWindowHandle;
choosefont.nSizeMin = 64;
choosefont.nSizeMax = 64;
choosefont.Flags = (int)CHOOSEFONTFLAGS.CF_SCREENFONTS
| (int)CHOOSEFONTFLAGS.CF_INITTOLOGFONTSTRUCT
| (int)CHOOSEFONTFLAGS.CF_FORCEFONTEXIST
| (int)CHOOSEFONTFLAGS.CF_NOVERTFONTS;
choosefont.lpLogFont = pLogfont;
choosefont.nFontType = 0x2000;
IntPtr pChoosefont = Marshal.AllocHGlobal(Marshal.SizeOf(choosefont));
Marshal.StructureToPtr(choosefont, pChoosefont, false);
// 显示字体对话框
bool result = Win32Helper.ChooseFont(pChoosefont);
if (result)
{
// 从非托管内存中获取字体的结构体信息
LOGFONT logfont1 = (LOGFONT)Marshal.PtrToStructure(pLogfont, typeof(LOGFONT));
Font font1 = Font.FromLogFont(logfont1); // 以Font对象表示
// 更新当前改变过后的数据
DocumentModel.FontFamily = font1.Name;
DocumentModel.FontSize = font1.Size;
DocumentModel.FontStyle = "Normal";
DocumentModel.FontWeight = "Normal";
// 判断是否是斜体
if ((font1.Style & FontStyle.Italic) != 0) { DocumentModel.FontStyle = "Italic"; }
// 判断是否加粗
if ((font1.Style & FontStyle.Bold) != 0) { DocumentModel.FontWeight = "Bold"; }
}
// 释放内存
Marshal.FreeHGlobal(pChoosefont);
Marshal.FreeHGlobal(pLogfont);
}
至此，格式菜单的功能已经实现 . . .