wxlua-users

[wxlua-users] Deriving from wxDataObjectSimple

[strawman <str...@la...>]

 From the wx docs for wxDataObjectSimple:

"Notice that this is still an abstract base class and cannot be used but 
should be derived from.
The objects supporting rendering the data must override GetDataSize and 
GetDataHere while the objects which may be set must override SetData."

Is it possible to use this class from Lua?  I'm trying to register a 
custom clipboard format and can't see any other way of passing a custom 
wxDataFormat.

Re: [wxlua-users] Deriving from wxDataObjectSimple

[John L. <jla...@gm...>]

On Sat, Apr 7, 2012 at 7:40 PM, strawman <str...@la...> wrote:
>  From the wx docs for wxDataObjectSimple:
>
> "Notice that this is still an abstract base class and cannot be used but
> should be derived from.
> The objects supporting rendering the data must override GetDataSize and
> GetDataHere while the objects which may be set must override SetData."
>
> Is it possible to use this class from Lua?  I'm trying to register a
> custom clipboard format and can't see any other way of passing a custom
> wxDataFormat.

I just added it, you can of course simply use a seriallized string for
exchanging any kind of data and in some cases that might be simplest.

However to use a wxDataObjectSimple, get the newest version of wxLua
from subversion.

Usage is as follows:

------------------------
d = wx.wxLuaDataObjectSimple(wx.wxDataFormat("asd"))

d.data = "x" -- store the data somewhere

print(d:SetData("aaa"), d.data, d:GetDataSize(), d:GetDataHere())

d.GetDataSize = function(d) return string.len(d.data) end
d.GetDataHere = function(d) return true, d.data end -- len must equal
GetDataSize()
d.SetData     = function(d,s) d.data = s; return true end

print(d:SetData("aaa"), d.data, d:GetDataSize(), d:GetDataHere())
-----------------------------
output will be:

false	x	0	false	
true	aaa	3	true	aaa


I have not had time to test it further, but it should work with the
clipboard, please let me know if it doesn't.

Regards,
     John

Re: [wxlua-users] Deriving from wxDataObjectSimple

[strawman <str...@la...>]

On 09/04/2012 04:57, John Labenski wrote:
> Usage is as follows:
>
> ------------------------
> d = wx.wxLuaDataObjectSimple(wx.wxDataFormat("asd"))
>
> d.data = "x" -- store the data somewhere
>
> print(d:SetData("aaa"), d.data, d:GetDataSize(), d:GetDataHere())
>
> d.GetDataSize = function(d) return string.len(d.data) end
> d.GetDataHere = function(d) return true, d.data end -- len must equal
> GetDataSize()
> d.SetData     = function(d,s) d.data = s; return true end
>
> print(d:SetData("aaa"), d.data, d:GetDataSize(), d:GetDataHere())
> -----------------------------
> output will be:
>
> false	x	0	false	
> true	aaa	3	true	aaa
>
>
> I have not had time to test it further, but it should work with the
> clipboard, please let me know if it doesn't.

Thanks for the update; the example above works as shown, however it 
doesn't seem to play nicely with the clipboard:

fmt = wx.wxDataFormat("HTML Format")
obj = wx.wxLuaDataObjectSimple(fmt)
obj.data = "test"
function obj:GetDataHere() return true, self.data end
function obj:GetDataSize() return self.data:len() end
function obj:SetData(d) self.data = d return true end

clip = wx.wxClipboard.Get()
print(clip:IsSupported(fmt), clip:GetData(obj))
--> true    false
print(obj.data)
--> "test"

I've doublechecked the contents of the clipboard and there is definitely 
data available.  I've also tried passing 1 and 13 (CF_TEXT and 
CF_UNICODETEXT) to wxDataFormat, with the same result.

Re: [wxlua-users] Deriving from wxDataObjectSimple

[John L. <jla...@gm...>]

On Wed, Apr 11, 2012 at 5:38 PM, strawman <str...@la...> wrote:
>
> Thanks for the update; the example above works as shown, however it
> doesn't seem to play nicely with the clipboard:
>
> fmt = wx.wxDataFormat("HTML Format")
> obj = wx.wxLuaDataObjectSimple(fmt)
> obj.data = "test"
> function obj:GetDataHere() return true, self.data end
> function obj:GetDataSize() return self.data:len() end
> function obj:SetData(d) self.data = d return true end
>
> clip = wx.wxClipboard.Get()
> print(clip:IsSupported(fmt), clip:GetData(obj))
> --> true    false
> print(obj.data)
> --> "test"
>
> I've doublechecked the contents of the clipboard and there is definitely
> data available.  I've also tried passing 1 and 13 (CF_TEXT and
> CF_UNICODETEXT) to wxDataFormat, with the same result.

I think for custom formats you have to set the data to the clipboard
yourself. Is that what you're doing or are you trying to get HTML data
from copying from some other program? Try pasting a different
wx.wxLuaDataObjectSimple to the clipboard, but with the same
wxDataFormat and see if you can retrieve that.

If all you want is HTML from the some other program in the clipboard,
use wxDF_HTML and don't bother with the wxLuaDataObjectSimple, see :
http://wxlua.sourceforge.net/docs/wxluaref.html#wxDataFormatId

Regards,
    John

Re: [wxlua-users] Deriving from wxDataObjectSimple

[strawman <str...@la...>]

On 12/04/2012 05:23, John Labenski wrote:
 > Is that what you're doing or are you trying to get HTML data from 
copying from some other program?

I'm trying to get HTML clipboard data from Firefox/Chrome; they register 
a format called "HTML Format" at runtime, which has a different internal 
ID to CF_HTML/wxDF_HTML, and the ID changes every time Windows is restarted.

fmt = wx.wxDataFormat("HTML Format")
print(fmt:GetType(), wx.wxClipboard.Get():IsSupported(fmt))
-- 49358   true
fmt = wx.wxDataFormat(wx.wxDF_HTML)
print(fmt:GetType(), wx.wxClipboard.Get():IsSupported(fmt))
-- 30      false

I've checked this against a clipboard inspection tool and it matches the 
actual contents of the clipboard, so registering the DataFormat seems to 
be working.

 > If all you want is HTML from the some other program in the clipboard,
 > use wxDF_HTML and don't bother with the wxLuaDataObjectSimple, see :
 > http://wxlua.sourceforge.net/docs/wxluaref.html#wxDataFormatId

Is this possible without using a DataObjectSimple?  From looking at the 
manual, DataFormatId is only used by DataFormat, which is only used by 
DataObjectSimple.

Re: [wxlua-users] Deriving from wxDataObjectSimple

[John L. <jla...@gm...>]

On Thu, Apr 12, 2012 at 5:27 PM, strawman <str...@la...> wrote:
> On 12/04/2012 05:23, John Labenski wrote:
>  > Is that what you're doing or are you trying to get HTML data from
> copying from some other program?
>
> I'm trying to get HTML clipboard data from Firefox/Chrome; they register
> a format called "HTML Format" at runtime, which has a different internal
> ID to CF_HTML/wxDF_HTML, and the ID changes every time Windows is restarted.
>
> fmt = wx.wxDataFormat("HTML Format")
> print(fmt:GetType(), wx.wxClipboard.Get():IsSupported(fmt))
> -- 49358   true
> fmt = wx.wxDataFormat(wx.wxDF_HTML)
> print(fmt:GetType(), wx.wxClipboard.Get():IsSupported(fmt))
> -- 30      false

Weird, I don't know anything about wxDF_HTML, but the wxWidgets docs
say that it's only supported with Visual Studio and non unicode
builds, so there's something special about it.

> I've checked this against a clipboard inspection tool and it matches the
> actual contents of the clipboard, so registering the DataFormat seems to
> be working.
>
>  > If all you want is HTML from the some other program in the clipboard,
>  > use wxDF_HTML and don't bother with the wxLuaDataObjectSimple, see :
>  > http://wxlua.sourceforge.net/docs/wxluaref.html#wxDataFormatId
>
> Is this possible without using a DataObjectSimple?  From looking at the
> manual, DataFormatId is only used by DataFormat, which is only used by
> DataObjectSimple.

I guess not, try this after copying from Firefox or Internet Explorer.
I get text from wxDF_TEXT and "HTML Format" and the HTML from the
derived wxLuaDataObjectSimple, but with some sort of header on it.

-----------------
htmlDataObject = wx.wxLuaDataObjectSimple(wx.wxDataFormat("HTML Format"))

htmlDataObject.data = "x" -- store the data somewhere

print(htmlDataObject:SetData("aaa"), htmlDataObject.data,
htmlDataObject:GetDataSize(), htmlDataObject:GetDataHere())

htmlDataObject.GetDataSize = function(htmlDataObject) return
string.len(htmlDataObject.data) end
htmlDataObject.GetDataHere = function(htmlDataObject) return true,
htmlDataObject.data end -- len must equal
htmlDataObject.SetData     = function(htmlDataObject,s)
htmlDataObject.data = s; return true end

print(htmlDataObject:SetData("aaa"), htmlDataObject.data,
htmlDataObject:GetDataSize(), htmlDataObject:GetDataHere())

function GetFromClipboard(dataformat, fmt_str)

    local clipboard = wx.wxClipboard.Get()

    -- Read some text
    if clipboard:Open() then
        if clipboard:IsSupported( dataformat ) then

            local data = wx.wxTextDataObject()
            clipboard:GetData( data )
            --wx.wxMessageBox( data:GetText() )
            print(dataformat:GetType(), fmt_str, data:GetText())

            if (fmt_str == "HTML Format") then
                clipboard:GetData( htmlDataObject )
                print(dataformat:GetType(), fmt_str, htmlDataObject.data)
            end
        else
            print(dataformat:GetType(), fmt_str, "NO AVAILABLE DATA IN
THIS FORMAT!")
        end
        clipboard:Close()
    end
end

GetFromClipboard(wx.wxDataFormat(wx.wxDF_TEXT), "Text")
GetFromClipboard(wx.wxDataFormat(wx.wxDF_HTML), "wxDF_HTML")
GetFromClipboard(wx.wxDataFormat("HTML Format"), "HTML Format")
-----------

I copied the word "Include" colored red from the wxWidgets
documentation in Firefox, then ran the above.

false	x	0	false	
true	aaa	3	true	aaa
1	Text	Include
30	wxDF_HTML	NO AVAILABLE DATA IN THIS FORMAT!
49379	HTML Format	Include
49379	HTML Format	Version:0.9
StartHTML:00000172
EndHTML:00000286
StartFragment:00000206
EndFragment:00000250
SourceURL:http://docs.wxwidgets.org/2.8/wx_wxdataobject.html#wxdataobject
<html><body>
<!--StartFragment--><b><font color="#FF0000">Include
</font></b><!--EndFragment-->
</body>
</html>

--------------

Regards,
    John

Re: [wxlua-users] Deriving from wxDataObjectSimple

[John L. <jla...@gm...>]

ps. Do a SVN update. I had the signature wrong on
wxLuaDataObjectSimple::SetData() so it would never be called by
wxWidgets.

Regards,
    John

Re: [wxlua-users] Deriving from wxDataObjectSimple

[strawman <str...@la...>]

On 13/04/2012 23:06, John Labenski wrote:
> ps. Do a SVN update. I had the signature wrong on
> wxLuaDataObjectSimple::SetData() so it would never be called by
> wxWidgets.

Looks like this was the issue; thanks again for the help, it works 
perfectly now.