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# haxe-ui
  • o
    I saw that
  • o
    🙂
  • d
    I have a bit of weird thing to implement and I'm wondering if anything in HaxeUI can help. Suppose I have a VBox and some elements to place in the VBox (potentially using spacers to separate them, or just using Absolute instead of a VBox). I want each element to be able to request a particular y value in the VBox (hence the need for spacers). But the elements could request similar y values, that would cause them to overlap. No overlap should occur, and the elements should position themselves to be as close to the requested y value as possible without overlapping. I can implement a policy for who gets priority (probably just order they were added to the VBox). Is there any existing code that could help with this? Or is this something I'd need to implement manually?
  • b
    You could just use a vbox with spacing set to 0. Then sort elements by y value, add each with a spacer added after each, and set the previous spacer height as needed, should a vertical gap be needed. No overlap this way.
  • d
    thanks!
  • b
    @User - i wasnt 100% sure i understood the q, but it sounds like intoxopox did 🙂
  • b
    stack trace / test app?
  • m
    @User I'm getting a null pointer exception after destroying a sprite on my game, but the exception is being raised by haxeui flixel backend... Aigh, I'm working on getting the stacktrace first
  • m
    Just a min
  • m
    This one is probably a hard one to isolate, but I can try
  • b
    how come? Cant you just run debug and see the stack?
  • m
    That's what I'm doing, just takes a while to reproduce
  • b
    right
  • m
    Otherwise I'll have to code a scenario where it happens, but since I don't know the cause...
  • m
    Copy code
    Uncaught exception: Null access
Called from haxe.ui.backend.flixel.$StateHelper.groupHasMember(haxe/ui/backend/flixel/StateHelper.hx:68)
Called from haxe.ui.backend.flixel.$StateHelper.groupHasMember(haxe/ui/backend/flixel/StateHelper.hx:78)
Called from haxe.ui.backend.flixel.$StateHelper.hasMember(haxe/ui/backend/flixel/StateHelper.hx:50)
Called from haxe.ui.backend.ComponentImpl.__onMouseMove(haxe/ui/backend/ComponentImpl.hx:510)
Called from haxe.ui.backend.flixel.$MouseHelper.onMouseMove(haxe/ui/backend/flixel/MouseHelper.hx:162)
Called from openfl.display.$SimpleButton.~__constructor__.3(lime/app/Module.hx:0)
Called from openfl.events.EventDispatcher.__dispatchEvent(openfl/events/EventDispatcher.hx:178)
Called from openfl.display.DisplayObject.__dispatch(openfl/display/DisplayObject.hx:507)
Called from openfl.display.Stage.__dispatchStack(openfl/display/Stage.hx:1307)
Called from openfl.display.Stage.__onMouse(openfl/display/Stage.hx:2479)
Called from openfl.display.Stage.__dispatchPendingMouseEvent(openfl/display/Stage.hx:1254)
Called from openfl.display.Stage.__onLimeUpdate(openfl/display/Stage.hx:2151)
Called from lime.app._Event_Int_Void.dispatch(lime/_internal/macros/EventMacro.hx:91)
Called from lime._internal.backend.native.NativeApplication.handleApplicationEvent(lime/_internal/backend/native/NativeApplication.hx:175)
Called from lime._internal.backend.native.NativeApplication.exec(lime/_internal/backend/native/NativeApplication.hx:146)
Called from lime.app.Application.exec(lime/app/Application.hx:150)
Called from $ApplicationMain.create(ApplicationMain.hx:130)
Called from $ApplicationMain.main(ApplicationMain.hx:25)
Called from fun$18015(?:1)
  • m
    I destroy a sprite, as soon as the mouse moves (it seems) this happens
  • b
    First guess would be a mouse event that’s not cleaned up, like an OUT that is dispatching on the removed sprite
  • b
    i think its because members gets nulled
  • m
    The sprite I destroy has nothing to do with haxe ui
  • m
    It's not even related to GUI at all
  • b
    can you pull and try again?
  • m
    sure
  • m
    Copy code
    Uncaught exception: Null access
Called from haxe.ui.backend.flixel.$StateHelper.groupHasMember(haxe/ui/backend/flixel/StateHelper.hx:60)
Called from haxe.ui.backend.flixel.$StateHelper.groupHasMember(haxe/ui/backend/flixel/StateHelper.hx:78)
Called from haxe.ui.backend.flixel.$StateHelper.hasMember(haxe/ui/backend/flixel/StateHelper.hx:50)
Called from haxe.ui.backend.ComponentImpl.__onMouseMove(haxe/ui/backend/ComponentImpl.hx:510)
Called from haxe.ui.backend.flixel.$MouseHelper.onMouseMove(haxe/ui/backend/flixel/MouseHelper.hx:162)
Called from openfl.display.$SimpleButton.~__constructor__.3(lime/app/Module.hx:0)
Called from openfl.events.EventDispatcher.__dispatchEvent(openfl/events/EventDispatcher.hx:178)
Called from openfl.display.DisplayObject.__dispatch(openfl/display/DisplayObject.hx:507)
Called from openfl.display.Stage.__dispatchStack(openfl/display/Stage.hx:1307)
Called from openfl.display.Stage.__onMouse(openfl/display/Stage.hx:2479)
Called from openfl.display.Stage.__dispatchPendingMouseEvent(openfl/display/Stage.hx:1254)
Called from openfl.display.Stage.__onLimeUpdate(openfl/display/Stage.hx:2151)
Called from lime.app._Event_Int_Void.dispatch(lime/_internal/macros/EventMacro.hx:91)
Called from lime._internal.backend.native.NativeApplication.handleApplicationEvent(lime/_internal/backend/native/NativeApplication.hx:175)
Called from lime._internal.backend.native.NativeApplication.exec(lime/_internal/backend/native/NativeApplication.hx:146)
Called from lime.app.Application.exec(lime/app/Application.hx:150)
Called from $ApplicationMain.create(ApplicationMain.hx:130)
Called from $ApplicationMain.main(ApplicationMain.hx:25)
Called from fun$18015(?:1)
  • b
    Copy code
    haxe
        if (group == null || group.members == null) {
            return false;
        }
  • b
    eh? How can that fail
  • m
    let me double check if the pull came through
  • b
    pretty sure it did
  • m
    i did haxelib update but it seems like I still have the old version?
  • m
    I'll double check the pull and build clean
  • b
    what is line 60 in your StateHelper class?
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