CODEWITHSUNDEEP
javacheckboxtreeswt
Raguram
Raguram

Reputation: 157

How to make child Tree Items checked/un-checked if parent Tree was made checked/un-checked

I'm having a Check-box Tree View structure, consisting of parent and child nodes.

I want to make all the child nodes [of the parent node] appear as checked if parent Tree is checked. Similarly, if parent Tree is unchecked then its childrens should be unchecked.

Upvotes: 2

Views: 4078

Answers (1)

Monikka
Monikka

Reputation: 528

The best way to achieve this would be using the JFace CheckboxTreeViewer as it has the following predefined methods to simplify the task.

  1. setSubtreeChecked - Sets the child elements checked on selecting the parent node

  2. getCheckedElements - Gets all the checked tree elements

    final CheckboxTreeViewer treeViewer = new CheckboxTreeViewer(parent);

// When user checks a checkbox in the tree, check all its children
treeViewer.addCheckStateListener(new ICheckStateListener() {
public void checkStateChanged(CheckStateChangedEvent event) {
    // If the item is checked . . .
    if (event.getChecked()) {
      // . . . check all its children
      treeViewer.setSubtreeChecked(event.getElement(), true);
    }
  }
});

// Get the selected elements from the tree
Object[] actuallyChecked = treeViewer.getCheckedElements();

Upvotes: 4

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