FXRuby: adding child widgets after #run has started

ruby-talk
1

Hello all,

Is there a way in Fox to add widgets after the widget hierarchy has been built and
FXApp#run has started ?

Say, I have an empty FXScrollWindow, and I want to add FXMatrix to it with
lots of its own children, on some event (button click, etc).

So far, I have not found a way to see the widgets I’ve added.

···

–
Best regards,
Yuri Leikind

2

Yuri Leikind wrote:

Is there a way in Fox to add widgets after the widget hierarchy has been built and
FXApp#run has started?

Say, I have an empty FXScrollWindow, and I want to add FXMatrix to it with
lots of its own children, on some event (button click, etc).

So far, I have not found a way to see the widgets I’ve added.

See this question from the FOX FAQ list:

http://www.fox-toolkit.org/faq.html#CREATELATER

If you add widgets after the program’s started, you’ll need to call
create() on them after adding them.

3

Yes, it does work. In some cases. But in other cases it doesn’t. Please take a look at the example:

require “fox”
class App < Fox::FXApp

    include Fox

    def initialize
        super("app")            
        window = FXMainWindow.new(self,"app", nil, nil, 0, 0, 500, 300)
        contents = FXVerticalFrame.new(window, LAYOUT_SIDE_TOP|LAYOUT_FILL_X|LAYOUT_FILL_Y)

        grbox1 = FXGroupBox.new(contents, "Options", GROUPBOX_TITLE_LEFT|LAYOUT_FILL_X|LAYOUT_FILL_Y)
        build(grbox1, false)
        
        grbox2 = FXGroupBox.new(contents, "Options", GROUPBOX_TITLE_LEFT|LAYOUT_FILL_X|LAYOUT_FILL_Y)
        #build(grbox2, false)

        FXButton.new(contents, "Click me").connect(SEL_COMMAND) do
            build(grbox2, true)
        end
        create
        window.show
        run
    end   
    
    def build(parent, creat)
        scrollarea = FXScrollWindow.new(parent, VSCROLLER_ALWAYS|LAYOUT_FILL_X|LAYOUT_FILL_Y)
        
        scrollable = FXMatrix.new(scrollarea, 2, MATRIX_BY_COLUMNS|LAYOUT_FILL_X, DEFAULT_SPACING, 
                DEFAULT_SPACING, DEFAULT_SPACING, DEFAULT_SPACING, 30, 30)        
    
    
        1.upto(10) do
             FXLabel.new(scrollable, "some name", nil, LABEL_NORMAL)
             FXCheckButton.new(scrollable, "yes", nil, 0, CHECKBUTTON_NORMAL|LAYOUT_SIDE_LEFT)
        end
        scrollarea.create if creat
    end
end

App.new

We have 2 FXScrollWindow instances here, one of which is built before run , another - after.
So that another FXScrollWindow is never seen. I don’t see why.

···

On Sat, 24 Jan 2004 00:29:58 +0900 Lyle Johnson lyle@users.sourceforge.net wrote:

 Yuri Leikind wrote:
 
 > Is there a way in Fox to add widgets after the widget hierarchy has been built and
 > FXApp#run has started?
 > 
 > Say, I have an empty FXScrollWindow, and I want to add FXMatrix to it with
 > lots of its own children, on some event (button click, etc).
 > 
 > So far, I have not found a way to see the widgets I've added.
 
 See this question from the FOX FAQ list:
 
 	http://www.fox-toolkit.org/faq.html#CREATELATER
 
 If you add widgets after the program's started, you'll need to call 
 create() on them after adding them.

–
Best regards,
Yuri Leikind

4

Yes, it does work. In some cases. But in other cases it doesn't. Please take a look at the example:

<snip>

We have 2 FXScrollWindow instances here, one of which is built before run , another - after.
So that another FXScrollWindow is never seen. I don't see why.

The problem is that merely adding an FXScrollWindow to the FXGroupBox during that second call to build() doesn't mark the layout of the group box as "dirty". That is to say, FOX doesn't assume that adding the scroll window changed the size of the parent group box (grbox2), and so that widget's layout doesn't get recalculated as a result. In this case, you need to explicitly mark the group box layout as dirty by calling its recalc() method. Try adding the following line at the end of build(), after the call to FXScrollWindow#create:

  scrollarea.recalc

and see if you get the result you're after.

Hope this helps,

Lyle

···

On Jan 23, 2004, at 12:38 PM, Yuri Leikind wrote:

5

Oh yes, it does, thank you again.

···

On Sat, 24 Jan 2004 13:50:06 +0900 Lyle Johnson lyle@knology.net wrote:

 The problem is that merely adding an FXScrollWindow to the FXGroupBox 
 during that second call to build() doesn't mark the layout of the group 
 box as "dirty". That is to say, FOX doesn't assume that adding the 
 scroll window changed the size of the parent group box (grbox2), and so 
 that widget's layout doesn't get recalculated as a result. In this 
 case, you need to explicitly mark the group box layout as dirty by 
 calling its recalc() method. Try adding the following line at the end 
 of build(), after the call to FXScrollWindow#create:
 
 	scrollarea.recalc
 
 and see if you get the result you're after.
 
 Hope this helps,

–
Best regards,
Yuri Leikind