C#窗口窗体:将图片放到WPF RichTextBox中(在ElementHost中)
C#窗口窗体:将图片放到WPF RichTextBox中(在ElementHost中)
提问于 2014-09-21 19:54:17
我有一个c# Windows项目，其窗体上有一个WPF RichTextBox (在ElementHost中)，并且希望从资源管理器(Windows7 x64)拖放一张图片到其中，但是光标只显示不允许的符号。这是我的密码：
private void Form1_Load(object sender, EventArgs e)
{
this.AllowDrop = true;
elementHost1.AllowDrop = true;
}
public UserControl1()
{
InitializeComponent();
Background = System.Windows.Media.Brushes.Transparent;
this.AllowDrop = true;
richTextBox1.AllowDrop = true;
}事件是使用设计器订阅的。他们中没有人被解雇：
private void richTextBox1_DragEnter(object sender, DragEventArgs e)
{
MessageBox.Show("Test");
}
private void richTextBox1_DragLeave(object sender, DragEventArgs e)
{
MessageBox.Show("Test");
}
private void richTextBox1_DragOver(object sender, DragEventArgs e)
{
MessageBox.Show("Test");
}
private void richTextBox1_Drop(object sender, DragEventArgs e)
{
MessageBox.Show("Test");
}如果我使用Windows，RichTextBox是工作的，但我需要一个WPF RichTextBox：
private void Form1_Load(object sender, EventArgs e)
{
richTextBox1.AllowDrop = true;
richTextBox1.DragDrop += new DragEventHandler(richTextBox1_DragDrop);
}
private void richTextBox1_DragDrop(object sender, EventArgs e)
{
MessageBox.Show("Test");
}回答 1
Stack Overflow用户
回答已采纳
发布于 2014-09-22 23:52:49
您需要使用PreviewDragEnter、PreviewDragOver和PreviewDrop事件：
public Window1()
{
InitializeComponent();
// mainRTB is the name of my RichTextBox.
mainRTB.PreviewDragEnter += new DragEventHandler(mainRTB_PreviewDragEnter);
mainRTB.PreviewDragOver += new DragEventHandler(mainRTB_PreviewDragEnter);
mainRTB.PreviewDrop += new DragEventHandler(mainRTB_PreviewDrop);
mainRTB.AllowDrop = true;
}
static bool IsImageFile(string fileName)
{
return true; // REPLACE THIS STUB WITH A REAL METHOD.
}
void mainRTB_PreviewDrop(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.FileDrop))
{
// Note that you can have more than one file.
string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);
if (files != null && files.Length > 0)
{
// Filter out non-image files
if (mainRTB.Document.PasteImageFiles(mainRTB.Selection, files.Where(IsImageFile)))
e.Handled = true;
}
}
}
void mainRTB_PreviewDragEnter(object sender, DragEventArgs e)
{
string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);
// Filter out non-image files
if (files != null && files.Length > 0 && files.Where(IsImageFile).Any())
{
// Consider using DragEventArgs.GetPosition() to reposition the caret.
e.Handled = true;
}
}然后，以下方法将图像粘贴到当前选择范围内：
public static bool PasteImageFiles(this FlowDocument doc, TextRange selection, IEnumerable<string> files)
{
// Assuming you have one file that you care about, pass it off to whatever
// handling code you have defined.
FlowDocument tempDoc = new FlowDocument();
Paragraph par = new Paragraph();
tempDoc.Blocks.Add(par);
foreach (var file in files)
{
try
{
BitmapImage bitmap = new BitmapImage(new Uri(file));
Image image = new Image();
image.Source = bitmap;
image.Stretch = Stretch.None;
InlineUIContainer container = new InlineUIContainer(image);
par.Inlines.Add(container);
}
catch (Exception)
{
Debug.WriteLine("\"file\" was not an image");
}
}
if (par.Inlines.Count < 1)
return false;
try
{
var imageRange = new TextRange(par.Inlines.FirstInline.ContentStart, par.Inlines.LastInline.ContentEnd);
using (var ms = new MemoryStream())
{
string format = DataFormats.XamlPackage;
imageRange.Save(ms, format, true);
ms.Seek(0, SeekOrigin.Begin);
selection.Load(ms, format);
return true;
}
}
catch (Exception)
{
Debug.WriteLine("Not an image");
return false;
}
}
}顺便说一句，这种方法避免使用剪贴板将图像粘贴到RichTextBox中--人们有时会看到这一点，但这并不理想。
与其粘贴当前所选内容，不如将图像拖放到当前拖放位置。如果是这样，请从以下内容开始：Get the mouse position during drag and drop和this：How can I insert an image into a WPF RichTextBox at runtime in between text so the text floats around the image
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/25963244
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