"Mark Collard" <MarkColl***@discussions.microsoft.com> wrote in message
news:06693DC1-5148-4C93-A7BE-D47EB2C6CBEC@microsoft.com...
> I'm currently writing an application that has a RichTextBox and a toolbar
> which includes the following toolbar buttons:
> - Font
> - Font Size
> - Bold
> - Italic
> - Underline
>
> I want the toolbox buttons to act the same as the ones in Word. i.e. When
> you select text that has different Fonts the Font toolbar button (combo
> box)
> is blanked, and when you select text that has different Font Sizes the
> Font
> Size toolbar button (combo box) is blanked.
>
> The RichTextBox control has a property called SelectionFont. The
> SelectionFont property returns null if the selected text contains
> different
> fonts, which is fine if I just wanted to update the Font toolbar button
> (combo box), but I also want to update the Font Size, Bold, Italic and
> Underline buttons. So I looked for an API solution and found that using
> the
> EM_GETCHARFORMAT message with the SendMessage API would return me the
> selected Font, Font Size, Bold, Italic and Underline settings, but it
> doesn't
> tell me when multiple Fonts or Font Sizes have been selected. In these
> cases
> it seems to return the Font and Font Size values of where the cursor is in
> the RichTextBox.
>
> How can I workout if the selected text in the RichTextBox control contains
> multiple fonts, but the same font size?
> And how can I workout if the selected text in the RichTextBox control
> contains multiple font sizes, but the same font?
>
> Thank you for your help.

"Nicholas Paldino [.NET/C# MVP]" wrote:

> Mark,
>
>     You can still call SendMessage, passing the EM_GETCHARFORMAT message.
> You just need to check the dwMask field to see which attributes are
> consistent throughout the selection.
>
> --
>           - Nicholas Paldino [.NET/C# MVP]
>           - mvp@spam.guard.caspershouse.com
>
> "Mark Collard" <MarkColl***@discussions.microsoft.com> wrote in message
> news:06693DC1-5148-4C93-A7BE-D47EB2C6CBEC@microsoft.com...
> > I'm currently writing an application that has a RichTextBox and a toolbar
> > which includes the following toolbar buttons:
> > - Font
> > - Font Size
> > - Bold
> > - Italic
> > - Underline
> >
> > I want the toolbox buttons to act the same as the ones in Word. i.e. When
> > you select text that has different Fonts the Font toolbar button (combo
> > box)
> > is blanked, and when you select text that has different Font Sizes the
> > Font
> > Size toolbar button (combo box) is blanked.
> >
> > The RichTextBox control has a property called SelectionFont. The
> > SelectionFont property returns null if the selected text contains
> > different
> > fonts, which is fine if I just wanted to update the Font toolbar button
> > (combo box), but I also want to update the Font Size, Bold, Italic and
> > Underline buttons. So I looked for an API solution and found that using
> > the
> > EM_GETCHARFORMAT message with the SendMessage API would return me the
> > selected Font, Font Size, Bold, Italic and Underline settings, but it
> > doesn't
> > tell me when multiple Fonts or Font Sizes have been selected. In these
> > cases
> > it seems to return the Font and Font Size values of where the cursor is in
> > the RichTextBox.
> >
> > How can I workout if the selected text in the RichTextBox control contains
> > multiple fonts, but the same font size?
> > And how can I workout if the selected text in the RichTextBox control
> > contains multiple font sizes, but the same font?
> >
> > Thank you for your help.
>
>
>