change the color in ritchbox

Question

Hi, i tried to change the color of text in a wpf ritch box, by getting the color value from a windows forms Colordialog 

this is the code behind:

 WpfFontColordialog wpfcolor = new WpfFontColordialog();
            Color cl = wpfcolor.opendialog();// wpfcolor:class
            MessageBox.Show("" + cl);
            TextRange tr = new TextRange(richTextB.Document.ContentStart, richTextB.Document.ContentEnd);
            tr.ApplyPropertyValue(TextElement.ForegroundProperty,cl);

but it didn't work

Answer 1

1.   Rather than it did not work, what did it do?

2.   What is WpfFontColordialog and what does it return?

3.   What "using" statments are in your codebehind?

LS

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Lloyd Sheen

Answer 2

WpfFontColordialog  is a class wich return the color chosen on an windows forms Colordialog: return Color

Answer 3

What you need to do is create a SolidColorBrush using the color and use that  to set the TextElement.ForegroundProperty.

LS

---

Lloyd Sheen

Answer 4

WpfFontColordialog  is a class wich return the color chosen on an windows forms Colordialog: return Color

Is it of type System.Drawing.Color or System.Windows.Media.Color?
The WinForms ColorPicker returns System.Drawing.Color type while
WPF deals with Windows.Media.Color.
So before creating a solidcolorbrush you need to create a
Windows.Media.Color for example using

var wpfColor = System.Windows.Media.Color.FromArgb (cl.A, cl.R, cl.G, cl.B);
tr.ApplyPropertyValue(TextElement.ForegroundProperty, new SolidColorBrush(wpfColor));

Answer 5

 Thank you,

it is System.Windows.Media.Color;

i tried this code , it work but:

=>the red change to blue

the blue change to red

also, it change all of the text not only the selected part

Answer 6

It's your code that defines the complete document range,
and did you mention selection? :-).

If you want the selection foreground to change
It's basically:

richTextBox1.Selection.ApplyPropertyValue (TextElement.ForegroundProperty, new SolidColorBrush(wpfColor));

You have, however, to clear the color when
the selection has changed.

Chris

Answer 7

yes i tried this but the problem was, the blue color is considred as a red!!

Answer 8

Not sure what you mean by that.  Are you returning a blue (0,0,255) from the dialog.  

Did it work with the entire set of text?

LS

---

Lloyd Sheen

Answer 9

I wrote a small sample app and I can find no problem with any of the code that has been presented here.

Both the entire contents (as you started) or the Selection both work with the info pulled from the ColorDialog.

In reality the only thing funky about all this is the color conversions made necessary by the terrible (IMHO) implementation of color in dot.net and the fact that the WPF team saw fit not to create WPF common dialogs.

Lloyd Sheen

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Lloyd Sheen

Answer 10

Make sure that in WpfFontColorDialog  the conversion from WinForms color
to WPF color is appropriate.
If R and B are interchanged, there's some spot in code that is
responsible.

Chris