本文利用一个简单的小例子【文本编辑器】，讲解richtextbox的用法。
windows窗体中的richtextbox控件用于显示，输入和操作格式化的文本，richtextbox除了拥有textbox控件的所有功能外，还可以显示字体，颜色，链接，从文件中读取和加载图像，以及查找指定的字符。richtextbox控件通常用于提供类似字体处理程序（如microsoft word）的文本操作和显示功能。richtextbox控件可以显示滚动条，且默认根据需要进行显示。
涉及知识点：
- selectionfont 获取或设置当前选定文本或插入点的字体。
- fontstyle 指定应用到文本的字形信息。
- selectionalignment 获取或设置应用到当前选定内容或插入点的对齐方式。
- selectionindent 获取或设置所选内容开始行的缩进距离（以像素为单位）。
- selectioncharoffset 获取或设置控件中的文本是显示在基线上、作为上标还是作为基线下方的下标。
- selectioncolor 获取或设置当前选定文本或插入点的文本颜色。
- selectionbackcolor 获取或设置在 system.windows.forms.richtextbox 控件中选中文本时文本的颜色。
- selectionbullet 获取或设置一个值，通过该值指示项目符号样式是否应用到当前选定内容或插入点。
- clipboard paste 粘贴指定剪贴板格式的剪贴板内容【插入图片时使用】。
- find 在对搜索应用特定选项的情况下，在 system.windows.forms.richtextbox 控件的文本中搜索位于控件内特定位置的字符串。
效果图如下【以下设置文本对应的格式】：
核心代码如下
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using system;using system.collections.generic;using system.drawing;using system.drawing.printing;using system.linq;using system.text;using system.threading.tasks;using system.windows.forms;namespace demorichtext.model{ public class defaultrickformat : baserichformat { public override void setformat(richtextbox rtbinfo) { } } /// <summary> /// 加粗格式 /// </summary> public class boldrichformat : baserichformat { public override void setformat(richtextbox rtbinfo) { font oldfont = rtbinfo.selectionfont; font newfont; if (oldfont.bold) { newfont = new font(oldfont, oldfont.style & ~fontstyle.bold);//支持位于运算 } else { newfont = new font(oldfont, oldfont.style | fontstyle.bold); } rtbinfo.selectionfont = newfont; } } /// <summary> /// 斜体 /// </summary> public class italicrichformat : baserichformat { public override void setformat(richtextbox rtbinfo) { font oldfont = rtbinfo.selectionfont; font newfont; if (oldfont.italic) { newfont = new font(oldfont, oldfont.style & ~fontstyle.italic); } else { newfont = new font(oldfont, oldfont.style | fontstyle.italic); } rtbinfo.selectionfont = newfont; rtbinfo.focus(); } } /// <summary> /// 下划线 /// </summary> public class underlinerichformat : baserichformat { public override void setformat(richtextbox rtbinfo) { font oldfont = rtbinfo.selectionfont; font newfont; if (oldfont.underline) { newfont = new font(oldfont, oldfont.style & ~fontstyle.underline); } else { newfont = new font(oldfont, oldfont.style | fontstyle.underline); } rtbinfo.selectionfont = newfont; rtbinfo.focus(); } } /// <summary> /// 删除线 /// </summary> public class strikelinerichformat : baserichformat { public override void setformat(richtextbox rtbinfo) { font oldfont = rtbinfo.selectionfont; font newfont; if (oldfont.underline) { newfont = new font(oldfont, oldfont.style & ~fontstyle.strikeout); } else { newfont = new font(oldfont, oldfont.style | fontstyle.strikeout); } rtbinfo.selectionfont = newfont; rtbinfo.focus(); } } /// <summary> /// 左对齐 /// </summary> public class leftrichformat : baserichformat { public override void setformat(richtextbox rtbinfo) { rtbinfo.selectionalignment = horizontalalignment.left; rtbinfo.focus(); } } /// <summary> /// 居中对齐 /// </summary> public class centerrichformat : baserichformat { public override void setformat(richtextbox rtbinfo) { if (rtbinfo.selectionalignment == horizontalalignment.center) { rtbinfo.selectionalignment = horizontalalignment.left; } else { rtbinfo.selectionalignment = horizontalalignment.center; } rtbinfo.focus(); } } /// <summary> /// 右对齐 /// </summary> public class rightrichformat : baserichformat { public override void setformat(richtextbox rtbinfo) { if (rtbinfo.selectionalignment == horizontalalignment.right) { rtbinfo.selectionalignment = horizontalalignment.left; } else { rtbinfo.selectionalignment = horizontalalignment.right; } rtbinfo.focus(); } } /// <summary> /// 缩进对齐 /// </summary> public class indentrichformat : baserichformat { public override void setformat(richtextbox rtbinfo) { //每次以10个像素进行缩进 rtbinfo.selectionindent = rtbinfo.selectionindent + 10; rtbinfo.focus(); } } /// <summary> /// 缩进对齐 /// </summary> public class outindentrichformat : baserichformat { public override void setformat(richtextbox rtbinfo) { //每次以10个像素进行缩进 rtbinfo.selectionindent = rtbinfo.selectionindent - 10; rtbinfo.focus(); } } /// <summary> /// 下标 /// </summary> public class subscriptrichformat : baserichformat { public override void setformat(richtextbox rtbinfo) { if (rtbinfo.selectioncharoffset < 0) { rtbinfo.selectioncharoffset = 0; } else { rtbinfo.selectioncharoffset = -5; } rtbinfo.focus(); } } /// <summary> /// 上标 /// </summary> public class superscriptrichformat : baserichformat { public override void setformat(richtextbox rtbinfo) { if (rtbinfo.selectioncharoffset > 0) { rtbinfo.selectioncharoffset = 0; } else { rtbinfo.selectioncharoffset = 5; } rtbinfo.focus(); } } /// <summary> /// 字体 /// </summary> public class fontrichformat : baserichformat { public override void setformat(richtextbox rtbinfo) { fontdialog f = new fontdialog(); if (f.showdialog() == dialogresult.ok) { fontfamily family = f.font.fontfamily; rtbinfo.selectionfont = new font(family, rtbinfo.selectionfont.size, rtbinfo.selectionfont.style); } rtbinfo.focus(); } } /// <summary> /// 文本颜色 /// </summary> public class forecolorrichformat : baserichformat { public override void setformat(richtextbox rtbinfo) { colordialog f = new colordialog(); if (f.showdialog() == dialogresult.ok) { rtbinfo.selectioncolor = f.color; } rtbinfo.focus(); } } /// <summary> /// 文本背景颜色 /// </summary> public class bgcolorrichformat : baserichformat { public override void setformat(richtextbox rtbinfo) { colordialog f = new colordialog(); if (f.showdialog() == dialogresult.ok) { rtbinfo.selectionbackcolor = f.color; } rtbinfo.focus(); } } /// <summary> /// ul列表,项目符号样式 /// </summary> public class ulrichformat : baserichformat { public override void setformat(richtextbox rtbinfo) { if (rtbinfo.selectionbullet) { rtbinfo.selectionbullet = false; } else { rtbinfo.selectionbullet = true; rtbinfo.bulletindent = 10; } rtbinfo.focus(); } } /// <summary> /// 图片插入 /// </summary> public class picrichformat : baserichformat { public override void setformat(richtextbox rtbinfo) { openfiledialog o = new openfiledialog(); o.initialdirectory = appdomain.currentdomain.basedirectory; o.title = "请选择图片"; o.filter = "jpeg|*.jpeg|jpg|*.jpg|png|*.png|gif|*.gif"; if (o.showdialog() == dialogresult.ok) { string filename = o.filename; try { image bmp = image.fromfile(filename); clipboard.setdataobject(bmp); dataformats.format dataformat = dataformats.getformat(dataformats.bitmap); if (rtbinfo.canpaste(dataformat)) { rtbinfo.paste(dataformat); } } catch (exception exc) { messagebox.show("图片插入失败。" + exc.message, "提示", messageboxbuttons.ok, messageboxicon.information); } } rtbinfo.focus(); } } /// <summary> /// 删除 /// </summary> public class delrichformat : baserichformat { public override void setformat(richtextbox rtbinfo) { rtbinfo.selectedtext = ""; rtbinfo.focus(); } } /// <summary> /// 查找 /// </summary> public class searchrichformat : baserichformat { public override void setformat(richtextbox rtbinfo) { string find = rtbinfo.tag.tostring(); int index= rtbinfo.find(find, 0,richtextboxfinds.none); int startpos = index; int nextindex = 0; while (nextindex != startpos)//循环查找字符串，并用蓝色加粗12号times new roman标记之 { rtbinfo.selectionstart = index; rtbinfo.selectionlength = find.length; rtbinfo.selectioncolor = color.blue; rtbinfo.selectionfont = new font("times new roman", (float)12, fontstyle.bold); rtbinfo.focus(); nextindex = rtbinfo.find(find, index + find.length, richtextboxfinds.none); if (nextindex == -1)//若查到文件末尾，则充值nextindex为初始位置的值，使其达到初始位置，顺利结束循环，否则会有异常。 { nextindex = startpos; } index = nextindex; } rtbinfo.focus(); } } /// <summary> /// 打印 /// </summary> public class printrichformat : baserichformat { private richtextbox richtextbox; public override void setformat(richtextbox rtbinfo) { this.richtextbox = rtbinfo; printdocument pd = new printdocument(); pd.printpage += new printpageeventhandler(pd_printpage); // 打印文档 pd.print(); } private void pd_printpage(object sender, printpageeventargs ev) { //ev.graphics.drawstring(richtextbox.text); //ev.hasmorepages = true; } } /// <summary> /// 字体大小 /// </summary> public class fontsizerichformat : baserichformat { public override void setformat(richtextbox rtbinfo) { string fontsize = rtbinfo.tag.tostring(); float fsize = 0.0f; if (float.tryparse(fontsize, out fsize)) { rtbinfo.selectionfont = new font(rtbinfo.font.fontfamily, fsize, rtbinfo.selectionfont.style); } rtbinfo.focus(); } }} |
页面代码【由于实现了代码封装，所有页面代码较少】
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using demorichtext.model;using system;using system.collections.generic;using system.componentmodel;using system.data;using system.drawing;using system.linq;using system.text;using system.threading.tasks;using system.windows.forms;namespace demorichtext{ public partial class mainform : form { public mainform() { initializecomponent(); } public void btnbuttonclick(object sender, eventargs e) { button btn = (button)sender; btntype btntype; if (enum.tryparse<btntype>(btn.tag.tostring(), out btntype)) { if (btntype == btntype.search) { if (!string.isnullorempty(this.txtsearch.text.trim())) { this.rtbinfo.tag = this.txtsearch.text.trim(); } else { return; } } irichformat richfomat = richformatfactory.createrichformat(btntype); richfomat.setformat(this.rtbinfo); } } private void combfontsize_selectedindexchanged(object sender, eventargs e) { float fsize = 12.0f; if (combfontsize.selectedindex > -1) { if (float.tryparse(combfontsize.selecteditem.tostring(), out fsize)) { rtbinfo.tag = fsize.tostring(); irichformat richfomat = richformatfactory.createrichformat(btntype.fontsize); richfomat.setformat(this.rtbinfo); } return; } } }} |
richtextbox是一个功能丰富的控件，值得学习。
点击文末原文地址下载源码。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://www.cnblogs.com/hsiang/archive/2017/04/10/6691420.html
