Re: [wxlua-users] How to check type when iterating over wxWindowList

[Paul K <pau...@ya...>]

Hi John,

This looks like exactly the information I was looking for. DynamicCast
is the method I was missing. Thank you for the detailed examples.

Paul.

On Tue, Jun 12, 2012 at 8:57 PM, John Labenski <jla...@gm...> wrote:
> On Tue, Jun 12, 2012 at 2:26 AM, Paul K <pau...@ya...> wrote:
>>
>> I have the same problem as described here
>> (https://groups.google.com/forum/?fromgroups#!topic/wxpython-users/T78KWU6vS_A):
>> when tabs in AuiNotebook are moved using drag and drop, their order
>> changes on the screen, but not internally and I'd like to enumerate
>> them in the right order.
>
> Use a unique wxWindow ID or wxWindow::Get/SetName() to give each
> notebook page a unique name so you can find the window no matter what.
> You can also use wxWindow::FindWindowById/Name(). Doing this should be
> the cleanest solution since you will definitely know what window
> you're getting.
>
>> I can get the list of children for my notebook
>> (notebook:GetChildren()) and can enumerate those using
>> GetFirst()/GetNext() and then get their target using GetData(), but
>> all their targets are of wxWindow type. How do I know which one is
>> AuiTabCtrl and how do I cast it to AuiTabCtrl to call GetPage()?
>
> Here's how to get information about what an object is and how to cast
> wxObject derived classes up and down their class hierarchy.
>
> The wxClassInfo is may not be right for all classes and this function
> only works for wxObject derived classes, but it will work for all
> major classes. You can also just call Lua's tostring() function to get
> the object type as string name. NOTE! The integer number is NOT fixed
> between versions, but will be constant within a single run.
>
> Here's some code run in the wxLuaEdit console to show some of the
> possibilities and what works and what doesn't.
>
> f = wx.wxFrame(wx.NULL, -1, "Hello")
> w = wx.wxWindow(f, -1)
> f:Show(true)
> c = wx.wxComboBox(w, -1)
> ci = c:GetClassInfo() -- from wxObject
> print(ci)
> userdata: 0x161d918 [wxClassInfo(0x7f33d2cf8b40, 23)]
> print(ci:GetClassName())
> wxComboBox
> print(tostring(c))
> userdata: 0x161b368 [wxComboBox(0x1614c00, 134)]
> cw = c:DynamicCast("wxWindow")
> print(cw)
> userdata: 0x16273f8 [wxWindow(0x1614c00, 368)]
> ciw = ci:DynamicCast("wxWindow")
>
> Error: Lua: Error while running chunk
> [string "wxLuaShell"]:1: wxLua: Unable to call an unknown method
> 'DynamicCast' on a 'wxClassInfo' type.
> stack traceback:
>        [C]: ?
>        [string "wxLuaShell"]:1: in main chunk
>
> c_from_win = cw:DynamicCast("wxComboBox")
> print(c_from_win)
> userdata: 0x161b368 [wxComboBox(0x1614c00, 134)]
> dialog_from_combobox = cw:DynamicCast("wxDialog")
>
> Error: Lua: Error while running chunk
> [string "wxLuaShell"]:1: wxLua: wxObject::DynamicCast() Unable to cast
> a 'wxComboBox' to a 'wxDialog' with wxClassInfo 'wxDialog'.
> Function called: 'DynamicCast(wxWindow, string)'
> 01. wxObject::DynamicCast(wxObject(self), string)
> stack traceback:
>        [C]: in function 'DynamicCast'
>        [string "wxLuaShell"]:1: in main chunk
>
> Hope this helps,
>    John
>
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