I have a WPF application on which the user can paste some data from Word inside a RichTextBox... but if that word data has an image, I need to remove it, how can I accomplish that?
Since the FlowDocument is xml, maybe doing some linq magic could do it, but I don't know how.
There is a tool called WordtoXAML Converter (http://wordtoxaml.codeplex.com). You can use that to convert your Word document contents to XAML, use regular expression matching to identify the images and then strip them out.
The following code will do what you want. While it can be a bit wasteful (it looks through the entire document instead of just the bit that was just pasted), it is the only way to do it, as sometimes the RichTextBox is inaccurate when it indicates the recently painted range:
public class MyTextBox : RichTextBox
{
public MyTextBox()
{
CommandBindings.Add(new CommandBinding(ApplicationCommands.Paste, Paste));
}
protected virtual void Paste(object sender, ExecutedRoutedEventArgs e)
{
Paste();
foreach (var image in FindImages())
{
if (image.SiblingInlines != null)
{
image.SiblingInlines.Remove(image);
}
}
}
IEnumerable<InlineUIContainer> FindImages()
{
var result = new List<InlineUIContainer>();
var blocks = Document.Blocks;
for (TextPointer position = blocks.FirstBlock.ElementStart; position != null && position.CompareTo(blocks.LastBlock.ElementEnd) != 1; position = position.GetNextContextPosition(LogicalDirection.Forward))
{
InlineUIContainer element = position.Parent as InlineUIContainer;
if (element != null && element.Child is Image)
{
result.Add(element);
}
}
return result;
}
}
Related
I am trying to create a "debug" TextBlock, in the sense it is just like a MessageBox, but doesn't interrupt like it. Rather, it is like a statusbar, which gives output information silently. Here is my current code
private void Debug(string data)
{
TextBlock tb = componentContainer.FindName("Debugbox") as TextBlock;
if (tb == null)
{
MessageBox.Show("yo");
tb = new TextBlock() {Foreground = Brushes.Orange };
if (NameScope.GetNameScope(tb) == null)
NameScope.SetNameScope(tb, new NameScope());
componentContainer.RegisterName("Debugbox", tb);
componentContainer.Children.Add(tb);
}
tb.Text = data;
}
However, it is giving me "No NameScope found to register the Name". I tried replacing
componentContainer.RegisterName("Debugbox", tb);
with
Namescope.GetNameScope(tb).RegisterName("Debugbox", tb);
and it works well. But if this function is used multiple times, the TextBlock is simply overwritten which makes the required output hard to see.
NOTE : componentContainer is a Canvas
Does anyone know what I am doing wrong? Or is there any better way to do something similar?
Why not simply keep the TextBlock instance in a private field:
private TextBlock debugBox;
private void Debug(string data)
{
if (debugBox == null)
{
debugBox = new TextBlock { Foreground = Brushes.Orange };
componentContainer.Children.Add(debugBox);
}
debugBox.Text = data;
}
Using datagridview bound to BindingSource control bound to a LINQ to SQL class, I wonder how to position the bindingSource to a specific record, that is, when I type a Product name in a textbox, the bindingsource should move to that specific product. Here is my code:
In my form FrmFind:
NorthwindDataContext dc;
private void FrmFind_Load(object sender, EventArgs e)
{
dc = new NorthwindDataContext();
var qry = (from p in dc.Products
select p).ToList();
FindAbleBindingList<Product> list = new FindAbleBindingList<Product>(qry);
productBindingSource.DataSource = list.OrderBy(o => o.ProductName);
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
TextBox tb = sender as TextBox;
int index = productBindingSource.Find("ProductName", tb.Text);
if (index >= 0)
{
productBindingSource.Position = index;
}
}
In the program class:
public class FindAbleBindingList<T> : BindingList<T>
{
public FindAbleBindingList()
: base()
{
}
public FindAbleBindingList(List<T> list)
: base(list)
{
}
protected override int FindCore(PropertyDescriptor property, object key)
{
for (int i = 0; i < Count; i++)
{
T item = this[i];
//if (property.GetValue(item).Equals(key))
if (property.GetValue(item).ToString().StartsWith(key.ToString()))
{
return i;
}
}
return -1; // Not found
}
}
How can I implement the find method to make it work?
You can combine the BindingSource.Find() method with the Position property.
For example, if you have something like this in your TextBox changed event handler:
private void textBox1_TextChanged(object sender, EventArgs e)
{
TextBox tb = sender as TextBox;
int index = bs.Find("Product", tb.Text);
if (index >= 0)
{
bs.Position = index;
}
}
This of course will depend on a lot of things like the particular implementation of the Find method the data source for the binding source has.
In a question you asked a little while ago I gave you an implementation for Find which worked with full matches. Below is a slightly different implementation that will look at the start of the property being inspected:
protected override int FindCore(PropertyDescriptor property, object key)
{
// Simple iteration:
for (int i = 0; i < Count; i++)
{
T item = this[i];
if (property.GetValue(item).ToString().StartsWith(key.ToString()))
{
return i;
}
}
return -1; // Not found
}
Do note that the above method is case sensitive - you can change StartsWith to be case insensitive if you need.
One key thing to note about the way .Net works is that the actual type of an object is not sufficient all the time - the declared type is what consuming code knows about.
This is the reason why you get a NotSupported exception when calling the Find method, even though your BindingList implementation has a Find method - the code that receives this binding list doesn't know about the Find.
The reason for that is in these lines of code:
dc = new NorthwindDataContext();
var qry = (from p in dc.Products
select p).ToList();
FindAbleBindingList<Product> list = new FindAbleBindingList<Product>(qry);
productBindingSource.DataSource = list.OrderBy(o => o.ProductName);
When you set the data source for the binding source you include the extension method OrderBy - Checking this shows that it returns IOrderedEnumerable, an interface described here on MSDN. Note that this interface has no Find method, so even though the underlying FindableBindingList<T> supports Find the binding source doesn't know about it.
There are several solutions (the best is in my opinion to extend your FindableBindingList to also support sorting and sort the list) but the quickest for your current code is to sort earlier like so:
dc = new NorthwindDataContext();
var qry = (from p in dc.Products
select p).OrderBy(p => p.ProductName).ToList();
FindAbleBindingList<Product> list = new FindAbleBindingList<Product>(qry);
productBindingSource.DataSource = list;
In WinForms there are no entirely out of the box solutions for the things you are trying to do - they all need a little bit of custom code that you need to put together to match just your own requirements.
I took a different approach. I figured, programmatically, every record must be checked until a match is found, so I just iterated using the MoveNext method until I found a match. Unsure if the starting position would be the First record or not, so I used the MoveFirst method to ensure that is was.
There is one assumption, and that is that what you are searching for is unique in that column. In my case, I was looking to match an Identity integer.
int seekID;
this.EntityTableBindingSource.MoveFirst();
if (seekID > 0)
{
foreach (EntityTable sd in EntityTableBindingSource)
{
if (sd.ID != seekID)
{
this.t_EntityTableBindingSource.MoveNext();
}
else
{
break;
}
}
}
I didn't really care for either answer provided. Here is what I came up with for my problem:
// Create a list of items in the BindingSource and use labda to find your row:
var QuickAccessCode = customerListBindingSource.List.OfType<CustomerList>()
.ToList().Find(f => f.QuickAccessCode == txtQAC.Text);
// Then use indexOf to find the object in your bindingSource:
var pos = customerListBindingSource.IndexOf(QuickAccessCode);
if (pos < 0)
{
MessageBox.Show("Could not find " + txtQAC.Text);
}
else
{
mainFrm.customerListBindingSource.Position = pos;
}
sorry for my bad english... The default for a RichTextBox content is to inherit the Foreground color from the RichTextBox itself. That's nice, but if I set a specific Foreground color to some part of my text, that part does not inherit the Foreground anymore, obviously. How can I make my "colored" text inherit the Foreground again? I'm trying to do something like the "Automatic" color from Office Word but after I have set a specific color to a TextRange, I do not know how to unset it :/
TextRange.ClearAllProperties() does what I need, but also erases other properties like FontSize and FontFamily...
TextRange.ApplyPropertyValue(ForegroundProperty, DependencyProperty.UnsetValue) also does not do the trick...
You can also unset it by setting the property to null (this worked for me clearing out the background, for example removing highlighting)
TextRange.ApplyPropertyValue(TextElement.BackgroundProperty, null);
This seemed almost impossible to achieve since there is no "RemovePropertyValue" method. I also tried with span and got the same exception as you did so I made a method that collects all the Paragraphs within the TextRange and made a span for each separetly.. less than ideal, I know.. Anyway, it works for a small example but might be pretty hard to work with for something more complex.
private List<Span> m_spanList = new List<Span>();
private void c_setForegroundButton_Click(object sender, RoutedEventArgs e)
{
TextPointer textPointerStart = c_richTextBox1.Selection.Start;
TextPointer textPointerEnd = c_richTextBox1.Selection.End;
TextRange textRange = new TextRange(textPointerStart, textPointerEnd);
SetForeground(textRange);
}
private void c_clearForegroundButton_Click(object sender, RoutedEventArgs e)
{
foreach (Span span in m_spanList)
{
span.ClearValue(Span.ForegroundProperty);
}
}
public void SetForeground(TextRange textRange)
{
List<Paragraph> spannedParagraphs = new List<Paragraph>();
if (textRange.Start.Paragraph != null)
{
TextRange curRange = null;
Block cur = textRange.Start.Paragraph;
do
{
spannedParagraphs.Add(cur as Paragraph);
// Get next range
curRange = new TextRange(cur.ContentStart, cur.ContentEnd);
} while ((textRange.End.Paragraph == null || !curRange.Contains(textRange.End.Paragraph.ContentEnd)) && (cur = cur.NextBlock) != null);
}
if (spannedParagraphs.Count == 1)
{
Span span = new Span(c_richTextBox1.Selection.Start, c_richTextBox1.Selection.End);
span.Foreground = Brushes.Red;
m_spanList.Add(span);
}
else
{
for (int i = 0; i < spannedParagraphs.Count; i++)
{
if (i == spannedParagraphs.Count - 1)
{
Paragraph paragraph = spannedParagraphs[i];
// For some reason I get an exception here when I try this..
//m_span = new Span(paragraph.ElementStart, c_richTextBox1.Selection.End);
c_richTextBox1.Selection.Select(paragraph.ElementStart, c_richTextBox1.Selection.End);
Span span = new Span(c_richTextBox1.Selection.Start, c_richTextBox1.Selection.End);
span.Foreground = Brushes.Red;
m_spanList.Add(span);
}
else if (i == 0)
{
Paragraph paragraph = spannedParagraphs[i];
Span span = new Span(c_richTextBox1.Selection.Start, paragraph.ElementEnd);
span.Foreground = Brushes.Red;
m_spanList.Add(span);
}
else
{
Paragraph paragraph = spannedParagraphs[i];
Span span = new Span(paragraph.ElementStart, paragraph.ElementEnd);
span.Foreground = Brushes.Red;
m_spanList.Add(span);
}
}
}
}
If you look at the code of method TextRange.ApplyPropertyValue in the .NET Reference Source, you'll see that in the end it calls DependencyObject.SetValue on a collection of Inlines and Blocks, and DependencyObject.SetValue treats the value DependencyProperty.UnsetValue specially by effectively clearing the local value for the property.
The problem is that they didn't think of that when implementing TextRange.ApplyPropertyValue: it checks the passed property value against the property type, and in case of a reference type, it makes sure the passed value is either null or inherits from the same class, thus preventing us from passing DependencyProperty.UnsetValue.
One solution I found to implement a way of clearing local values of a TextRange for dependency properties of a reference type is the following:
// We declare a marker brush to be detected later in the TextRange.
var markerBrush = new SolidColorBrush();
// First we ask the TextRange implementation to set our marker brush on its content.
// Using ApplyPropertyValue here takes care of splitting inlines when necessary to make
// sure that only the selected text gets affected.
range.ApplyPropertyValue(TextElement.ForegroundProperty, markerBrush);
// Now, we search the text range for every Inline that has our brush set as the foreground
// brush, and we clear the Foreground dependency property.
var position = range.Start;
while (position != null && range.Contains(position))
{
if (position.GetPointerContext(LogicalDirection.Backward) == TextPointerContext.ElementStart &&
position.Parent is Inline inline &&
inline.ReadLocalValue(TextElement.ForegroundProperty) == _foregroundClearBrush)
inline.ClearValue(TextElement.ForegroundProperty);
position = position.GetNextContextPosition(LogicalDirection.Forward);
}
I'm building a simple editor using the wpf richtextbox. This editor has some sort of toggle buttons for Bold, Italic, Underlined, etc. which are 'pressed' when the selected text or the text at the cursor has the approptiate property. I did it like this:
private TextRange GetSelectedTextRange() {
if(_richTextBox == null) return null;
return new TextRange(_richTextBox.Selection.Start, _richTextBox.Selection.End);
}
private void UpdateIsItalic() {
TextRange selectedTextRange = GetSelectedTextRange();
if(selectedTextRange == null) {
IsItalic = false;
return;
}
object fontStyleObject = selectedTextRange.GetPropertyValue(Run.FontStyleProperty);
if(fontStyleObject is FontStyle) {
FontStyle fontStyle = (FontStyle)fontStyleObject;
IsItalic = (fontStyle == FontStyles.Italic || fontStyle == FontStyles.Oblique);
} else {
IsItalic = false;
}
}
The problem is, when the cursor is at the end of the line and a send for instance the ToggleItalic command to the RichTextBox, the values I get back from SelectedTextRange.GetPropertyValue are valid for the text the cursor is behind and not the text I'm about to type, thus I will get back the same value as before the command. But what I want is that when I send the ToggleItalic command, the result is that IsItalic is set to true when the letter I'm about to type is italic. Has anyone has an idea how to tackle this problem?
Many thanks in advance,
Liewe
I found a solution, I shoudn't make a new TextRange but just use the TextSelection, in short like this:
object fontStyleObject = _richTextBox.Selection.GetPropertyValue(Run.FontStyleProperty);
Here is the deal: I have a RichTextBox control and it works fine. The problem is that there is a button "Insert Current DateTime" which adds/injects the current datetime into the RichTextBox. The user can enter the datetime anywhere where the caret is pointing. This involves complicated string manipulation and stuff.
Any ideas how to get the current caret position. Whenever I get RichTextBox.CaretPositon it seems it is pointing to the start of the RichTextBox and not where the actual caret is.
UPDATE 1:
The date time button click code:
private void DateTimeStampButton_Click(object sender, RoutedEventArgs e)
{
//TextRange tr = new TextRange(textBox.Selection.Start, textBox.Selection.End);
var tr = new TextRange(textBox.Document.ContentStart, textBox.Document.ContentEnd);
if(tr.Text.Length == 2)
{
if(tr.Text == "\r\n")
{
tr.Text = tr.Text.TrimStart(new[] { '\r', '\n' });
}
}
textBox.CaretPosition.InsertTextInRun(DateTime.Now.ToShortDateString() + " " + DateTime.Now.ToShortTimeString() + ": ");
DateTimeStampButton.Focusable = false;
}
private void SharpRichTextBox_LostFocus(object sender, RoutedEventArgs e)
{
SetValue(TextProperty, Text);
var binding = BindingOperations.GetBinding(this, TextProperty);
if (binding == null) return;
if (binding.UpdateSourceTrigger == UpdateSourceTrigger.Default || binding.UpdateSourceTrigger == UpdateSourceTrigger.LostFocus)
{
// if (TextProperty != null) BindingOperations.GetBindingExpression(this, TextProperty).UpdateSource();
}
}
public string Text
{
get
{
var newValue = new TextRange(Document.ContentStart, Document.ContentEnd).Text.RemoveNewLineAndReturn();
return newValue;
}
set
{
if (!String.IsNullOrEmpty(value))
{
SetValue(TextProperty, value.RemoveNewLineAndReturn());
Document.Blocks.Clear();
Document.Blocks.Add(new Paragraph(new Run(value)));
OnPropertyChanged("Text");
}
}
}
UPDATE 2:
Turned out the problem was with the DateTime button being Focusable. I turned it to be not focusable and it worked as expected. When focus was lost on the RichTextBox it was resetting the caret position. It happened only once since in the code the btn_DateTime was dynamically being set as Focusable = false. I placed Focusable = false in XAML and everything worked fine from the start.
I'm using this code to successfully do what you are attempting:
private void insertNowButton_Click(object sender, RoutedEventArgs e)
{
//NOTE: The caret position does not change.
richTextBox1.CaretPosition.InsertTextInRun(DateTime.Now.ToString());
}
EDIT: Addressing Update 1
private void DateTimeStampButton_Click(object sender, RoutedEventArgs e)
{
var tr = new TextRange(textBox.Document.ContentStart, textBox.Document.ContentEnd);
if (tr.Text.Length == 2)
{
if (tr.Text == "\r\n")
{
tr.Text = tr.Text.TrimStart(new[] { '\r', '\n' });
}
}
/* Changing the text is the only way I can get the date to insert at the beginning */
tr.Text = "I need a beer at ";
textBox.CaretPosition.InsertTextInRun(DateTime.Now.ToString());
}
It looks like SetValue is changing the text so based on my test that actually changing the text resets the caret, I would agree with you that SetValue is causing the problem...
I tried this solution with WPFToolkit.Extended RichTextBox and it didn't work for me.
However I found another one and thought it would be good to post it in here in case someone else could use it.
My problem was also that the after I clicked a button that is supposed to append text at the caret location, it instead adds it at the beginning of the RichTextBox.
So The solution I found is similar to the one in here -
RichTextBox CaretPosition physical location
Instead of using CaretPosition I used RichTextBox.Selection.Start.InsertTextInRun("SomeText").
It considered the selection's start as the caret position even though no selection was made and therefore was good enough for me.
I hope someone will find this useful :)
This worked for me:
private void InsertText(String text, RichTextBox rtb)
{
rtb.CaretPosition = rtb.CaretPosition.GetPositionAtOffset(0, LogicalDirection.Forward);
rtb.CaretPosition.InsertTextInRun(text);
}
I found the code here:
How do I move the caret a certain number of positions in a WPF RichTextBox?