Brilliant, thanks! I made a TreeButton class which extends Button and simply added an ID field which let me identify it from the rest.
On Feb 21, 6:22 am, gregor <[email protected]> wrote: > Maybe a cleverer/simpler way to do this, but you could try extending > Button to include a reference to the TreeItem it's attached to, say > TreeButton. Then in your ClickListener onClick(Widget sender) { > if (sender instanceof TreeButton) { > TreeItem item = ((TreeButton)sender).getTreeItem(); > } > > That would save you slogging through the tree searching for an id or > something. > > On Feb 20, 11:22 pm, nebs <[email protected]> wrote: > > > Hello, > > > I'm having trouble identifying tree elements. Let me explain with an > > example. > > > Let's say I have a Tree object which contains a few TreeItem objects. > > Each TreeItem object in turn contains a few TreeItems and a button. > > These buttons are generated via loops and so do not have an object > > name associated (eg. they all must call the same event handler). Each > > button is set to trigger the same function (let's say buttonClicked > > (Widget sender)) when clicked on. > > > My problem now is that within the buttonClicked(Widget sender) method > > I don't know how to figure out which branch (or TreeItem) that > > particular button belongs to. > > > Here's a visual example: > > Tree: > > [ -] Fruits > > - Apple > > - Orange > > - [ ADD ] (<--- This is a Button widget) > > [ -] Vegetables > > - Carrot > > - Eggplant > > - Pepper > > - [ ADD ] (<--- This is a Button widget) > > [+] Dairy > > > All the button click events call this function: > > private void buttonClicked(Widget sender){ > > // How can I get the parent tree index via sender? > > > } > > > Let's say the user clicks on the "ADD" button which is under the > > "Fruits" subtree. How can I know that the button called belongs to > > "Fruits"? > > > I would like to have something like: > > int treeindex = sender.getParent().getPositionInTree(); > > And have it return for example 0 for fruits, 1 for Vegetables, 2 for > > Dairy, etc. > > I've looked through the JavaDoc but nothing jumped out at me right > > away. > > Maybe I'm missing something obvious. > > > Thanks in advance for any help. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/Google-Web-Toolkit?hl=en -~----------~----~----~----~------~----~------~--~---
