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inheritsFromComponent()

 
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Corroder
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PostPosted: Wed Oct 14, 2020 12:48 am    Post subject: inheritsFromComponent() Reply with quote
Is there any example how to use 'createClass' and 'inheritsFromComponent()' ?.

And is CE have function 'RegisterComponents()' ?.
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Dark Byte
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PostPosted: Wed Oct 14, 2020 1:52 am    Post subject: Reply with quote
btn=createComponentClass("TCEButton", form)

createClass similar but it has no owner control

RegisterComponents() no, but you can add buttons to the toolbar and set their name and hint property accordingly

registerClass also not, but that won't work in lua anyhow as it needs a pointer to a class object and not a string and you can not get a pointer to a class without it being registered

and inheritsFromComponent() just calls x=x.Parent repeatedly and checks if x.ClassName is TComponent
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Corroder
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PostPosted: Wed Oct 14, 2020 5:43 am    Post subject: Reply with quote
Yes DB, I know using 'createComponentClass(comp, owner), example:

Code:
f = createForm()
sb = createScrollBox(f)
f.Show()


This will rise an error, but if I use:

Code:
function createScrollBox(Parent)
local box = createComponentClass('TScrollBox', Parent)
 box.Parent = Parent
 return box
end

createForm()
sb = createScrollBox(f)
f.Show()


This will work properly since TScrollBox already register at 'ceguicomponents.pas' on CE source code.

So, I just thinking about how to add new component class which not exist yet on CE gui components..

For example TFontDialogs, and other dialog components inherit from class TCommonDialog (except : save, open, find and find directory which already registered in CE).

But it seem not work if the object components not register on 'ceguicomponents.pas' for example numericUpDown button, etc.

Example:

Code:
function createFontDialog(hwnd)
 local fd = createComponentClass('TFontDialog', hwnd)
 fd.Parent = hwnd
 return fd
end

-- or

function createFontDialog(hwnd)
 MyClass = createClass('TCommonDialog')
 TFontDialog = inheritsFromObject(MyClass)
 local fd = createComponentClass('TFontDialog', hwnd)
 fd.Parent = hwnd
 return fd
end


The last two function return error 'Access Violation'.

Or I just don't know how to these in correct way and need learn about it more.
Anyhow, thank you for your answer and supports.
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