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6.3 class changes

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Dark Byte
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Posted: Thu Jun 13, 2013 4:11 pm Post subject: 6.3 class changes

If you've downloaded 6.3 and are looking at main.lua you may notice that a lot of the old class related functions have been changed.

Instead of form_hide(form) and form_show(form) it now just show() and hide() , and the same for a lot of other function

Let's take a look at the CEForm and Form class:

Code:

Form Class: (Inheritance: ScrollingWinControl->CustomControl->WinControl->Control->Component->Object)
properties
OnClose: function - The function to call when the form gets closed
Menu: MainMenu - The main menu of the form

methods
centerScreen(); : Places the form at the center of the screen
hide() : Hide the form
show() : show the form
close(): Closes the form. Without an onClose this will be the same as hide
showModal() : show the form and wait for it to close and get the close result
isForegroundWindow(): returns true if the specified form has focus
setOnClose(function) : function (sender) : Return a CloseAction to determine how to close the window
getOnClose() : Returns the function
getMenu() : Returns the mainmenu object of this form
setMenu(mainmenu)

setBorderStyle( borderstyle): Sets the borderstyle of the window
getBorderStyle()

printToRasterImage(rasterimage): Draws the contents of the form to a rasterimage class object
dragNow(): Call this on mousedown on any object if you wish that the mousemove will drag the whole form arround. Useful for borderless windows (Dragging will stop when the mouse button is released)

CEForm Class: (Inheritance: Form->ScrollingWinControl->CustomControl->WinControl->Control->Component->Object)
createForm(visible OPT): creates a CEForm class object(window) and returns the pointer for it. Visible is default true but can be changed
createFormFromFile(filename): Returns the generated CEform

properties
DoNotSaveInTable: boolean - Set this if you do not wish to save the forms in the table
methods
saveToFile(filename): Saves a userdefined form
getDoNotSaveInTable(): Returns the DoNotSaveInTable property
setDoNotSaveInTable(boolean): Sets the DoNotSaveInTable property

As you can see, objects have properties and methods (and of course, inheritance)

Now, if you call createForm() you will get an object of the CEForm class.

Code:

myform=createForm(true)

To access the DoNotSaveInTable property you can use this: (Note the use of . instead of the old ceform_getDoNotSaveInTable(myform) )

Code:

oldState=myform.getDoNotSaveInTable()
myform.setDoNotSaveInTable(not oldState)

But since the property DoNotSaveInTable is published, this means you can also directly change it without having to call the methods manually:

Code:

myform.DoNotSaveInTable=not myform.DoNotSaveInTable

Which is probably a more cleaner looking code

Now for the inheritance. As before, you can still use the functions of objects that the current object is inherited from.
In the past, you would do form_show(myform) but now:

Code:

myform.show()

Same for accessing the properties that the parents of the object provide

Code:

myform.Top=100

In this case, Top is actually a property of the Control class, which Form also inherits from, so it can use that property as well.

Also, not all properties are explicitly published to lua, but you CAN make use of them as long as they are published. (visible in the form designer)
Let's take for example the AlphaBlend value of the form.

Code:

myform.AlphaBlend=true
myform.AlphaBlendValue=127

Note that for some properties you sometimes might have to use a string as input instead of a number. (Or in some cases when you get a charcase wrong, it used the lookup method instead of the predefined method)

One more thing that might need some explaining. In the previous version you had to use setMethodProperty to set the event handler to a specific function
In this version you can just use propertyname=function
e.g:

Code:

function someoneWantsToCloseMyForm(sender)
print("bye")
return caHide
end

myform.onClose=someoneWantsToCloseMyForm

but also:

Code:

myform.onClose=function(sender)
print("the end")
return caHide
end

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Last edited by Dark Byte on Sun Jun 16, 2013 2:03 pm; edited 1 time in total

mgr.inz.Player
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Posted: Thu Jun 13, 2013 5:21 pm Post subject:

Another thing worth to mention, we can use constructions like this:

Code:

menuItem = getMainForm().getMenu().getItems()

Or:

Code:

pic=createPicture()
font = createFont()
(...)
pic.Bitmap.Width=128
pic.Bitmap.Height=64
pic.Bitmap.Canvas.Font.assign(font)
pic.Bitmap.Canvas.Brush.Color=0x0000FF -- red color

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Last edited by mgr.inz.Player on Thu Jun 13, 2013 6:08 pm; edited 1 time in total

Dark Byte
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Posts: 25788
Location: The netherlands

Posted: Thu Jun 13, 2013 5:31 pm Post subject:

also

Code:

menuItem=getMainForm().Menu.Items

and you can even go further:

Code:

getMainForm().Menu.Items[0].Caption="Better &File Menu";

Code:

Items=getMainForm().Menu.Items;
Items[7].Caption="WTF?";
Items[7].Item[0].Caption="I do not need this"
Items[7][3].Caption="Peeps!"

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mgr.inz.Player
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Posted: Thu Jun 13, 2013 8:09 pm Post subject:

Still, creating menu is troublesome Very Happy

We can make it easier, like this:

Click Table->click Create form->close Form Designer
then execute this script:

Code:

function createOrGetBaseMenuItem(form)
if form==nil then return nil end

local baseItem = nil
if not form.Menu then baseItem = createMainMenu(form).Items
else baseItem = form.Menu.Items end

return baseItem
end

function addMemuItem(parent,caption)
if parent==nil then return nil end

local newItem = createMenuItem(parent); parent.add(newItem)
newItem.Caption = caption

return newItem
end

baseMenuItem = createOrGetBaseMenuItem(UDF1)
File = addMemuItem(baseMenuItem,'File')
Edit = addMemuItem(baseMenuItem,'Edit')
View = addMemuItem(baseMenuItem,'View')

Open = addMemuItem(File,'Open file')
Save = addMemuItem(File,'Save file')

Undo = addMemuItem(Edit,'Undo operation')
SelectAll = addMemuItem(Edit,'Select all')

But, I get crash error after closing CE when UDF1 is visible. If I hide UDF1 window and then close CE, there's no crash.
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