RichTextBox的使用
WPF里面雖然很多形式上跟Winform一樣，但是控件的使用上面還是會有很多詫異。RichTextBox就是一個例子，是的，在WPF里面對這個控件可以做很多Winform很難做的效果出來。
比如在對RichTextBox插入圖片，winform時代除了用復制粘貼這種借助剪貼板的差勁方法之外就是要重寫和自定義RichTextBox控件了。這就需要高超的編程能力了。但在WPF里面，只需要加幾個代碼就能搞定了。
在XAML里面添加圖片到RichTextBox可以如下所示：
??????? <RichTextBox HorizontalAlignment="Left" Margin="90,12,0,0" Name="richTextBox1">
??????????? <RichTextBox.Document>
??????????????? <FlowDocument Focusable="True" LineHeight="5">
??????????????????? <Paragraph x:Name="gara">??????????????????????
??????????????????????? 文字區域
????????????????????????<Image Source="D:\1342892_10.jpg" Focusable="True" Height="50" Stretch="Uniform" />???????????????????????
????????????????????????文字區域???????????????????????
??????????????????????? <Run Text="文字區域文字區域"></Run>
??????????????????????? <Run Text="文字區域"></Run>
??????????????????? </Paragraph>
??????????????????? <Paragraph x:Name="gara1">??????????????????????
??????????????????????? <Run Text="文字區域"></Run>
??????????????????????? <Run Text="文字區域"></Run>
??????????????????? </Paragraph>???????????????????
??????????????? </FlowDocument>
??????????? </RichTextBox.Document>
??????? </RichTextBox>
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這樣就往控件里面添加了圖片了。
備注：FlowDocument里面的LineHeight?屬性是文字段落的間距。默認間距很大，所以這里調整一下！
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當然，這樣未必能夠完全滿足要求，因為有時候我們需要在程序運行的時候點擊按鈕選取圖片進行添加。代碼如下：
private void AddJPG_Click(object sender, RoutedEventArgs e)
??????? {
??????????? string filepath = "";
??????????? string filename = "";
??????????? OpenFileDialog openfilejpg = new OpenFileDialog();
??????????? openfilejpg.Filter = "jpg圖片(*.jpg)|*.jpg|gif圖片(*.gif)|*.gif";
??????????? openfilejpg.FilterIndex = 0;
??????????? openfilejpg.RestoreDirectory = true;
??????????? openfilejpg.Multiselect = false;
??????????? if (openfilejpg.ShowDialog() == true)
??????????? {
??????????????? filepath = openfilejpg.FileName;
??????????????? Image img = new Image();
??????????????? BitmapImage bImg = new BitmapImage();???????????????
??????????????? img.IsEnabled = true;???????????????
??????????????? bImg.BeginInit();
??????????????? bImg.UriSource = new Uri(filepath, UriKind.Relative);
??????????????? bImg.EndInit();
??????????????? img.Source = bImg;?
??????????????? //MessageBox.Show(bImg.Width.ToString() + "," + bImg.Height.ToString());
??????????????? /* 調整圖片大小
??????????????? if (bImg.Height > 100 || bImg.Width > 100)
??????????????? {
??????????????????? img.Height = bImg.Height * 0.2;
??????????????????? img.Width = bImg.Width * 0.2;
??????????????? }*/
??????????????? img.Stretch = Stretch.Uniform;? //圖片縮放模式
??????????????? new InlineUIContainer(img, richTextBox1.Selection.Start); //插入圖片到選定位置
??????????? }
??????? }
這樣就插入了一張圖片到RichTextBox里了，是不是很簡單呢！
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原文在此：http://blogs.msdn.com/jfoscoding/archive/2006/01/14/512825.aspx?這里僅整理出其中的知識點：
1. 取得已被選中的內容：
(1)使用?RichTextBox.Document.Selection屬性
(2)訪問RichTextBox.Document.Blocks屬性的“blocks”中的Text
2. 在XAML中增加內容給RichTextBox:
<RichTextBox IsSpellCheckEnabled="True">
?? <FlowDocument>
??????? <Paragraph>
<!-- 這里加上你的內容 -->
????????? This is a richTextBox. I can <Bold>Bold</Bold>, <Italic>Italicize</Italic>, <Hyperlink>Hyperlink stuff</Hyperlink> right in my document.
??????? </Paragraph>
?? </FlowDocument>
</RichTextBox>
3. 縮短段間距,類似<BR>,而不是<P>
方法是使用Style定義段間距:
??? <RichTextBox>
??????? <RichTextBox.Resources>
??????????<Style TargetType="{x:Type Paragraph}">
????????????<Setter Property="Margin" Value="0"/>
????????? </Style>
??????? </RichTextBox.Resources>
??????? <FlowDocument>
????????? <Paragraph>
??????????? This is my first paragraph... see how there is...
????????? </Paragraph>
????????? <Paragraph>
??????????? a no space anymore between it and the second paragraph?
????????? </Paragraph>
??????? </FlowDocument>
????? </RichTextBox>
{
??? richTextBox.Document.Blocks.Clear();
??? using (StreamReader streamReader = File.OpenText(filename)) {
?????????? Paragraph paragraph = new Paragraph();
?????????? paragraph.Text = streamReader.ReadToEnd();
?????????? richTextBox.Document.Blocks.Add(paragraph);
??? }
}
private void LoadText(RichTextBox richTextBox, string txtContent)
{
??? richTextBox.Document.Blocks.Clear();
??? Paragraph paragraph = new Paragraph();
????paragraph.Text?= txtContent;
??? richTextBox.Document.Blocks.Add(paragraph);
}5. 取得指定RichTextBox的內容：
private string GetText(RichTextBox richTextBox)?
{
??????? TextRange textRange = new TextRange(richTextBox.Document.ContentStart, richTextBox.Document.ContentEnd);
??????? return textRange.Text;
}6. 將RTF (rich text format)放到RichTextBox中：private static void LoadRTF(string rtf, RichTextBox richTextBox)
??????? {
??????????? if (string.IsNullOrEmpty(rtf)) {
??????????????? throw new ArgumentNullException();
??????????? }
??????????? TextRange textRange = new TextRange(richTextBox.Document.ContentStart, richTextBox.Document.ContentEnd);
??????????? using (MemoryStream rtfMemoryStream = new MemoryStream()) {
??????????????? using (StreamWriter rtfStreamWriter = new StreamWriter(rtfMemoryStream)) {
??????????????????? rtfStreamWriter.Write(rtf);
??????????????????? rtfStreamWriter.Flush();
??????????????????? rtfMemoryStream.Seek(0, SeekOrigin.Begin);//Load the MemoryStream into TextRange ranging from start to end of RichTextBox.
??????????????????? textRange.Load(rtfMemoryStream, DataFormats.Rtf);
??????????????? }
??????????? }
??????? }7. 將文件中的內容加載為RichTextBox的內容
??????? private static void LoadFile(string filename, RichTextBox richTextBox)
??????? {
??????????? if (string.IsNullOrEmpty(filename)) {
??????????????? throw new ArgumentNullException();
??????????? }
??????????? if (!File.Exists(filename)) {
??????????????? throw new FileNotFoundException();
??????????? }
??????????? using (FileStream stream = File.OpenRead(filename)) {
??????????????? TextRange documentTextRange = new TextRange(richTextBox.Document.ContentStart, richTextBox.Document.ContentEnd);
??????????????? string dataFormat = DataFormats.Text;
??????????????? string ext = System.IO.Path.GetExtension(filename);
??????????????? if (String.Compare(ext, ".xaml",true) == 0) {
??????????????????? dataFormat = DataFormats.Xaml;
??????????????? }
??????????????? else if (String.Compare(ext, ".rtf", true) == 0) {
??????????????????? dataFormat = DataFormats.Rtf;
??????????????? }
??????????????? documentTextRange.Load(stream, dataFormat);
??????????? }????????
??????? }8. 將RichTextBox的內容保存為文件：
??????? private static void SaveFile(string filename, RichTextBox richTextBox)
??????? {
??????????? if (string.IsNullOrEmpty(filename)) {
??????????????? throw new ArgumentNullException();
??????????? }
??????????? using (FileStream stream = File.OpenWrite(filename)) {
??????????????? TextRange documentTextRange = new TextRange(richTextBox.Document.ContentStart, richTextBox.Document.ContentEnd);
??????????????? string dataFormat = DataFormats.Text;
??????????????? string ext = System.IO.Path.GetExtension(filename);
??????????????? if (String.Compare(ext, ".xaml", true) == 0) {
??????????????????? dataFormat = DataFormats.Xaml;
??????????????? }
??????????????? else if (String.Compare(ext, ".rtf", true) == 0) {
??????????????????? dataFormat = DataFormats.Rtf;
??????????????? }
??????????????? documentTextRange.Save(stream, dataFormat);
??????????? }
??????? }9. 做個簡單的編輯器：
? <!-- Window1.xaml -->
? <DockPanel>
??? <Menu DockPanel.Dock="Top">
????? <MenuItem Header="_File">
??????? <MenuItem Header="_Open File" Click="OnOpenFile"/>
??????? <MenuItem Header="_Save" Click="OnSaveFile"/>
??????? <Separator/>
??????? <MenuItem Header="E_xit" Click="OnExit"/>
????? </MenuItem>??????
??? </Menu>
??? <RichTextBox Name="richTextBox1"></RichTextBox>?????
? </DockPanel>
??????? // Window1.xaml.cs
??????? private void OnExit(object sender, EventArgs e) {
??????????? this.Close();
??????? }
??????? private void OnOpenFile(object sender, EventArgs e) {
??????????? Microsoft.Win32.OpenFileDialog ofd = new Microsoft.Win32.OpenFileDialog();
??????????? ofd.Filter = "Text Files (*.txt; *.xaml; *.rtf)|*.txt;*.xaml;*.rtf";
??????????? ofd.Multiselect = false;
??????????? if (ofd.ShowDialog() == true) {
??????????????? LoadFile(ofd.SafeFileName, richTextBox1);
??????????? }??????? }
??????? private void OnSaveFile(object sender, EventArgs e) {
??????????? Microsoft.Win32.SaveFileDialog sfd = new Microsoft.Win32.SaveFileDialog();
??????????? sfd.Filter = "Text Files (*.txt; *.xaml; *.rtf)|*.txt;*.xaml;*.rtf";
??????????? if (sfd.ShowDialog() == true) {
??????????????? SaveFile(sfd.SafeFileName, richTextBox1);
??????????? }
??????? }心中時常裝有一盤人生的大棋,天作棋盤,星作棋子,在斗轉星移中,只有不斷地搏擊人生,人生才有意義,生命才能彰顯光輝,才能收獲一分永恒。?
轉載于:https://www.cnblogs.com/jhxk/articles/2281119.html
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