com.boothen.jsonedit.outline.JsonContentOutlinePage.java Source code

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Here is the source code for com.boothen.jsonedit.outline.JsonContentOutlinePage.java

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/*******************************************************************************
 * Copyright 2014 Boothen Technology Ltd.
 *
 * Licensed under the Eclipse Public License, Version 1.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *   
 * https://eclipse.org/org/documents/epl-v10.html
 *  
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
/**
 *
 */
package com.boothen.jsonedit.outline;

import java.util.List;

import org.eclipse.jface.text.ITextSelection;
import org.eclipse.jface.viewers.DelegatingStyledCellLabelProvider;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.TreePath;
import org.eclipse.jface.viewers.TreeSelection;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.ui.ISelectionListener;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.texteditor.IDocumentProvider;
import org.eclipse.ui.texteditor.ITextEditor;
import org.eclipse.ui.views.contentoutline.ContentOutlinePage;

import com.boothen.jsonedit.core.model.jsonnode.JsonNode;
import com.boothen.jsonedit.outline.node.JsonTreeNode;

/**
 * JsonContentOutlinePage manages the outline view of the Json.
 *
 * @author Matt Garner
 *
 */
public class JsonContentOutlinePage extends ContentOutlinePage implements ISelectionListener {

    protected Object fInput;
    protected IDocumentProvider fDocumentProvider;
    protected ITextEditor fTextEditor;
    protected JsonContentProvider fContentProvider;

    public JsonContentOutlinePage(IDocumentProvider provider, ITextEditor editor) {
        super();
        fDocumentProvider = provider;
        fTextEditor = editor;
        fContentProvider = new JsonContentProvider(fDocumentProvider);
    }

    /* (non-Javadoc)
     * Method declared on ContentOutlinePage
     */
    @Override
    public void createControl(Composite parent) {

        super.createControl(parent);

        TreeViewer viewer = getTreeViewer();
        viewer.setContentProvider(fContentProvider);
        DelegatingStyledCellLabelProvider delegatingStyledCellLabelProvider = new DelegatingStyledCellLabelProvider(
                new JsonLabelProvider());
        viewer.setLabelProvider(delegatingStyledCellLabelProvider);
        getSite().getPage().addPostSelectionListener(this);

        if (fInput != null) {
            viewer.setInput(fInput);
            fContentProvider.setInput(fInput);

        }
    }

    /**
     * Remove the listener associated with the outline.
     *
     */
    @Override
    public void dispose() {

        getSite().getPage().removeSelectionListener(this);
        super.dispose();
    }

    /**
     * Selects the text in the editor associated with the item selected in the
     * outline view tree.
     */
    @Override
    public void selectionChanged(SelectionChangedEvent event) {

        ISelection selection = event.getSelection();

        if (selection.isEmpty())
            fTextEditor.resetHighlightRange();
        else {
            JsonTreeNode jsonTreeNode = (JsonTreeNode) ((IStructuredSelection) selection).getFirstElement();
            if (jsonTreeNode.isTextSelection()) {
                jsonTreeNode.setTextSelection(false);
                return;
            }

            int start = jsonTreeNode.getStart();
            int length = jsonTreeNode.getLength();
            try {
                fTextEditor.selectAndReveal(start, length);
            } catch (IllegalArgumentException x) {
                fTextEditor.resetHighlightRange();
            }
        }

    }

    /**
     * Sets the input of the outline page
     *
     * @param input the input of this outline page
     */
    public void setInput(Object input) {
        fInput = input;
        fContentProvider.setInput(fInput);
        update();
    }

    /**
     * Updates the outline page.
     */
    public void update() {
        TreeViewer viewer = getTreeViewer();

        if (viewer != null) {
            Control control = viewer.getControl();
            if (control != null && !control.isDisposed()) {
                control.setRedraw(false);
                viewer.setInput(fInput);
                control.setRedraw(true);
            }
        }
    }

    /**
     * Moves the outline view to show the element where the cursor in the
     * text editor is placed.
     */
    @Override
    public void selectionChanged(IWorkbenchPart part, ISelection selection) {

        if (selection instanceof ITextSelection) {
            ITextSelection textSelection = (ITextSelection) selection;
            int start = textSelection.getOffset();
            int length = textSelection.getLength();

            JsonTreeNode element = fContentProvider.findNearestElement(start, length);
            if (element != null) {
                element.setTextSelection(true);
                getTreeViewer().reveal(element);
                TreeSelection treeSelection = new TreeSelection(new TreePath(new Object[] { element }));
                getTreeViewer().setSelection(treeSelection);
            }
        }

    }

    public void setJsonNodes(List<JsonNode> jsonNodes) {
        fContentProvider.setJsonNodes(jsonNodes);
        if (fContentProvider.rootObject == null) {
            update();
        } else {
            TreeViewer viewer = getTreeViewer();

            if (viewer != null) {
                viewer.refresh();
            }
        }
    }
}