How to add elements to a JTree?
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ height:90px;width:728px;box-sizing:border-box;
}
So I made a JTree and I want to add a node called "Hello" whenever a user clicks a button. Here's the function that executes when the user clicks the button:
private static void addModel() {
MainWindow mainWindow = new MainWindow();
DefaultTreeModel model = (DefaultTreeModel) mainWindow.tree1.getModel();
DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode) mainWindow.tree1.getLastSelectedPathComponent();
System.out.println("2");
if (selectedNode != null) {
selectedNode.insert(new DefaultMutableTreeNode("Hello"), selectedNode.getIndex(selectedNode.getLastChild()));
model.reload(selectedNode);
System.out.println("1");
}
mainWindow.tree1.setModel(model);
}
Basically it's supposed to get the model, get the selected node, if a node is selected, then insert a new one at the end, reload it, then set the model of the tree to the new model. The numbers printed to the console are solely to make sure each part is running, and no matter what I do, selecting different nodes or whatever, I only get 2s (aka selectedNode is always equal to null). Why is this, and how can I add a new component to my JTree?
java user-interface jtree
asked Nov 16 '18 at 16:36
J. DoeJ. Doe
11
add a comment |
So I made a JTree and I want to add a node called "Hello" whenever a user clicks a button. Here's the function that executes when the user clicks the button:
private static void addModel() {
MainWindow mainWindow = new MainWindow();
DefaultTreeModel model = (DefaultTreeModel) mainWindow.tree1.getModel();
DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode) mainWindow.tree1.getLastSelectedPathComponent();
System.out.println("2");
if (selectedNode != null) {
selectedNode.insert(new DefaultMutableTreeNode("Hello"), selectedNode.getIndex(selectedNode.getLastChild()));
model.reload(selectedNode);
System.out.println("1");
}
mainWindow.tree1.setModel(model);
}
Basically it's supposed to get the model, get the selected node, if a node is selected, then insert a new one at the end, reload it, then set the model of the tree to the new model. The numbers printed to the console are solely to make sure each part is running, and no matter what I do, selecting different nodes or whatever, I only get 2s (aka selectedNode is always equal to null). Why is this, and how can I add a new component to my JTree?
java user-interface jtree
asked Nov 16 '18 at 16:36
J. DoeJ. Doe
11
add a comment |
So I made a JTree and I want to add a node called "Hello" whenever a user clicks a button. Here's the function that executes when the user clicks the button:
private static void addModel() {
MainWindow mainWindow = new MainWindow();
DefaultTreeModel model = (DefaultTreeModel) mainWindow.tree1.getModel();
DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode) mainWindow.tree1.getLastSelectedPathComponent();
System.out.println("2");
if (selectedNode != null) {
selectedNode.insert(new DefaultMutableTreeNode("Hello"), selectedNode.getIndex(selectedNode.getLastChild()));
model.reload(selectedNode);
System.out.println("1");
}
mainWindow.tree1.setModel(model);
}
Basically it's supposed to get the model, get the selected node, if a node is selected, then insert a new one at the end, reload it, then set the model of the tree to the new model. The numbers printed to the console are solely to make sure each part is running, and no matter what I do, selecting different nodes or whatever, I only get 2s (aka selectedNode is always equal to null). Why is this, and how can I add a new component to my JTree?
java user-interface jtree
asked Nov 16 '18 at 16:36
J. DoeJ. Doe
11
So I made a JTree and I want to add a node called "Hello" whenever a user clicks a button. Here's the function that executes when the user clicks the button:
private static void addModel() {
MainWindow mainWindow = new MainWindow();
DefaultTreeModel model = (DefaultTreeModel) mainWindow.tree1.getModel();
DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode) mainWindow.tree1.getLastSelectedPathComponent();
System.out.println("2");
if (selectedNode != null) {
selectedNode.insert(new DefaultMutableTreeNode("Hello"), selectedNode.getIndex(selectedNode.getLastChild()));
model.reload(selectedNode);
System.out.println("1");
}
mainWindow.tree1.setModel(model);
}
Basically it's supposed to get the model, get the selected node, if a node is selected, then insert a new one at the end, reload it, then set the model of the tree to the new model. The numbers printed to the console are solely to make sure each part is running, and no matter what I do, selecting different nodes or whatever, I only get 2s (aka selectedNode is always equal to null). Why is this, and how can I add a new component to my JTree?
java user-interface jtree
java user-interface jtree
asked Nov 16 '18 at 16:36
J. DoeJ. Doe
11
asked Nov 16 '18 at 16:36
J. DoeJ. Doe
11
asked Nov 16 '18 at 16:36
J. DoeJ. Doe
11
asked Nov 16 '18 at 16:36
J. DoeJ. Doe
11
asked Nov 16 '18 at 16:36
J. DoeJ. Doe
11
11
add a comment |
add a comment |
0
active
oldest
votes
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53341998%2fhow-to-add-elements-to-a-jtree%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53341998%2fhow-to-add-elements-to-a-jtree%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
