Re: events of "none visible" widgets ?
Thanks for the clarification Ian, Sounds logical... -- Ed --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to Google-Web-Toolkit@googlegroups.com To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/Google-Web-Toolkit?hl=en -~--~~~~--~~--~--~---
Re: events of "none visible" widgets ?
In my (albeit incomplete) understanding, if you click on the screen, the browser will work out what element is being rendered at that point on the screen and see if it has a handler for that event. Events then may bubble up through the dom hierarchy of elements until a handler is found (or not). There isn't a great big list of handlers which are all checked to see if a) they are in the right place and b) not masked by anything else and c) the right kind of handler. If you float an opaque div over the whole of your screen and click anywhere you like, the browser goes ah, a click ... what's on top ... div-x ... does it have a click handler? No ... parent? No ... end of story, no need to check anything else. Ian http://examples.roughian.com 2009/7/6 Ed > > He Brett, > Just missed your post when writing my own... > Thanks, so I don't have to worry about his... Sounds fine to me :) > > -- Ed > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to Google-Web-Toolkit@googlegroups.com To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/Google-Web-Toolkit?hl=en -~--~~~~--~~--~--~---
Re: events of "none visible" widgets ?
He Brett, Just missed your post when writing my own... Thanks, so I don't have to worry about his... Sounds fine to me :) -- Ed --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to Google-Web-Toolkit@googlegroups.com To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/Google-Web-Toolkit?hl=en -~--~~~~--~~--~--~---
Re: events of "none visible" widgets ?
> What listeners are you concerned about? You can't click something that isn't > visible. But do the listeners (example: click listener of a button), still appear in some kind of a DOM listener/handler collection such that they still cause some kind of run-overhead when another button event of a visible (: attached widget) is fired. The above may sound a bit strange but I am trying to understand how this event model/firing is handled on the DOM... Example: A button with a click listener. When the button is removed temporarily in a panel, what happens to his event reception/ sinking?..I this also moved aside/removed?... I can imagine that when having many panels that appear visible/hidden with many listeners, the listener should be handled properly. Something like: removing and adding the above click listener to the button in the onLoad and onUnload methods of the widget Such that the Dom isn't bothered with his listening Ed --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to Google-Web-Toolkit@googlegroups.com To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/Google-Web-Toolkit?hl=en -~--~~~~--~~--~--~---
Re: events of "none visible" widgets ?
Right. Ed, Ian's point was my point. If it panel is not visible, there is way for the browser to generate events for it. Even mouse move events, etc. GWT does not put listeners aside, but they don't cause extra overhead and occupy a negligible amount of memory. Basically, you don't have to worry about them. But if you will indeed "re-display" a panel at some point, it probably make sense just to hide it in the DeckPanel and pop it back to the top when needed. Of course, you always have the option of destroying panels in the deck if you feel that memory consumption becomes an issue. -Brett On Jul 6, 6:15 pm, Ian Bambury wrote: > What listeners are you concerned about? You can't click something that isn't > visible. > Ian > > http://examples.roughian.com > > 2009/7/6 Ed > > > > > > > He Brett, > > > Thanks for your reply. > > Let me check if I understand you correctly: > > So if I remove a panel from the display (replacing A with B in the > > DeckPanel), the listeners of automatically deactivated. And they > > become active again when putting it on the screen again (replacing B > > with A in the DeckPanel)? > > > So the listeners are automatically put aside by GWT and don't cause > > extra overhead? > > > Ed --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to Google-Web-Toolkit@googlegroups.com To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/Google-Web-Toolkit?hl=en -~--~~~~--~~--~--~---
Re: events of "none visible" widgets ?
He Brett, Thanks for your reply. Let me check if I understand you correctly: So if I remove a panel from the display (replacing A with B in the DeckPanel), the listeners of automatically deactivated. And they become active again when putting it on the screen again (replacing B with A in the DeckPanel)? So the listeners are automatically put aside by GWT and don't cause extra overhead? Ed --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to Google-Web-Toolkit@googlegroups.com To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/Google-Web-Toolkit?hl=en -~--~~~~--~~--~--~---
Re: events of "none visible" widgets ?
What listeners are you concerned about? You can't click something that isn't visible. Ian http://examples.roughian.com 2009/7/6 Ed > > He Brett, > > Thanks for your reply. > Let me check if I understand you correctly: > So if I remove a panel from the display (replacing A with B in the > DeckPanel), the listeners of automatically deactivated. And they > become active again when putting it on the screen again (replacing B > with A in the DeckPanel)? > > So the listeners are automatically put aside by GWT and don't cause > extra overhead? > > Ed > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to Google-Web-Toolkit@googlegroups.com To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/Google-Web-Toolkit?hl=en -~--~~~~--~~--~--~---
Re: events of "none visible" widgets ?
First, once removed, your listeners will not be fired. Second, I would suggesting looking at DeckPanel for your right-hand side panel. >From what it sounds like, if the user selects menu item "A" on the left, then a panel is displayed on the right. If they select "B", the "A" panel goes away, and is replaced by a "B" panel. However, if "A" is selected again, the "A" panel reappears on the right (replacing "B"). If that is indeed the case, consider DeckPanel, where "A" is simply "hidden" to show "B", or "B" is hidden to show "A". You can leave your listeners connected and they will again become active when that panel is surfaced. -Brett On Jun 30, 9:13 pm, Ed wrote: > I am trying to have a better understanding of the DOM Tree in relation > with events. A few questions about that: > Suppose I have a left menu that shows screen parts on the right side. > If I select a menu item, I will create the screen part and leave it > created during the whole application live cycle. > > 1) If another menu item is created, where is the previous selected > screen parts located on the DOM?... How does that work... It's a bit > unclear to me where something is located on the DOM.. > Info: selecting a screen parts occurs by adding/removing a panel to > the RootPanel. > > 2) If another menu item is created, what happens with the events and > listeners that are used by the widgets that are contained in the > previous selected screen part (that is unselected)...? > Does the widgets on the unselected screen parts still receive events? > Should I remove the widgets listeners in the onUnload and add them > again in the onLoad method to improve performance?. > > Cheers, > Ed --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to Google-Web-Toolkit@googlegroups.com To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/Google-Web-Toolkit?hl=en -~--~~~~--~~--~--~---
Re: events of "none visible" widgets ?
I am still struggling with the above. So if some expert have a minute, please share me your thoughts. -- Ed --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to Google-Web-Toolkit@googlegroups.com To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/Google-Web-Toolkit?hl=en -~--~~~~--~~--~--~---
events of "none visible" widgets ?
I am trying to have a better understanding of the DOM Tree in relation with events. A few questions about that: Suppose I have a left menu that shows screen parts on the right side. If I select a menu item, I will create the screen part and leave it created during the whole application live cycle. 1) If another menu item is created, where is the previous selected screen parts located on the DOM?... How does that work... It's a bit unclear to me where something is located on the DOM.. Info: selecting a screen parts occurs by adding/removing a panel to the RootPanel. 2) If another menu item is created, what happens with the events and listeners that are used by the widgets that are contained in the previous selected screen part (that is unselected)...? Does the widgets on the unselected screen parts still receive events? Should I remove the widgets listeners in the onUnload and add them again in the onLoad method to improve performance?. Cheers, Ed --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to Google-Web-Toolkit@googlegroups.com To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/Google-Web-Toolkit?hl=en -~--~~~~--~~--~--~---
