com.google.dart.tools.ui.internal.viewsupport.AppearanceAwareLabelProvider.java Source code

Introduction

Here is the source code for com.google.dart.tools.ui.internal.viewsupport.AppearanceAwareLabelProvider.java

Source

/*
 * Copyright (c) 2011, the Dart project authors.
 * 
 * Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 * 
 * http://www.eclipse.org/legal/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.google.dart.tools.ui.internal.viewsupport;

import com.google.dart.tools.ui.DartElementLabels;
import com.google.dart.tools.ui.PreferenceConstants;

import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.jface.viewers.LabelProviderChangedEvent;
import org.eclipse.ui.IEditorRegistry;
import org.eclipse.ui.IPropertyListener;
import org.eclipse.ui.PlatformUI;

/**
 * DartUILabelProvider that respects settings from the Appearance preference page. Triggers a viewer
 * update when a preference changes.
 */
public class AppearanceAwareLabelProvider extends DartUILabelProvider
        implements IPropertyChangeListener, IPropertyListener {

    public final static long DEFAULT_TEXTFLAGS = DartElementLabels.ROOT_VARIABLE
            | DartElementLabels.T_TYPE_PARAMETERS | DartElementLabels.M_PARAMETER_NAMES
            | DartElementLabels.M_APP_TYPE_PARAMETERS | DartElementLabels.M_APP_RETURNTYPE
            | DartElementLabels.REFERENCED_ROOT_POST_QUALIFIED;
    public final static int DEFAULT_IMAGEFLAGS = DartElementImageProvider.OVERLAY_ICONS;

    private long fTextFlagMask;
    private int fImageFlagMask;

    /**
     * Creates a labelProvider with DEFAULT_TEXTFLAGS and DEFAULT_IMAGEFLAGS
     */
    public AppearanceAwareLabelProvider() {
        this(DEFAULT_TEXTFLAGS, DEFAULT_IMAGEFLAGS);
    }

    /**
     * Constructor for AppearanceAwareLabelProvider.
     */
    public AppearanceAwareLabelProvider(long textFlags, int imageFlags) {
        super(textFlags, imageFlags);
        initMasks();
        PreferenceConstants.getPreferenceStore().addPropertyChangeListener(this);
        PlatformUI.getWorkbench().getEditorRegistry().addPropertyListener(this);
    }

    /*
     * @see IBaseLabelProvider#dispose()
     */
    @Override
    public void dispose() {
        PreferenceConstants.getPreferenceStore().removePropertyChangeListener(this);
        PlatformUI.getWorkbench().getEditorRegistry().removePropertyListener(this);
        super.dispose();
    }

    /*
     * @see IPropertyChangeListener#propertyChange(PropertyChangeEvent)
     */
    @Override
    public void propertyChange(PropertyChangeEvent event) {
        String property = event.getProperty();
        if (property.equals(PreferenceConstants.APPEARANCE_METHOD_RETURNTYPE)
                || property.equals(PreferenceConstants.APPEARANCE_METHOD_TYPEPARAMETERS)
                || property.equals(PreferenceConstants.APPEARANCE_CATEGORY)
                || property.equals(PreferenceConstants.APPEARANCE_PKG_NAME_PATTERN_FOR_PKG_VIEW)
                || property.equals(PreferenceConstants.APPEARANCE_COMPRESS_PACKAGE_NAMES)) {
            initMasks();
            LabelProviderChangedEvent lpEvent = new LabelProviderChangedEvent(this, null); // refresh all
            fireLabelProviderChanged(lpEvent);
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.eclipse.ui.IPropertyListener#propertyChanged(java.lang.Object, int)
     */
    @Override
    public void propertyChanged(Object source, int propId) {
        if (propId == IEditorRegistry.PROP_CONTENTS) {
            fireLabelProviderChanged(new LabelProviderChangedEvent(this, null)); // refresh
            // all
        }
    }

    /*
     * @see DartUILabelProvider#evaluateImageFlags()
     */
    @Override
    protected int evaluateImageFlags(Object element) {
        return getImageFlags() & fImageFlagMask;
    }

    /*
     * @see DartUILabelProvider#evaluateTextFlags()
     */
    @Override
    protected long evaluateTextFlags(Object element) {
        return getTextFlags() & fTextFlagMask;
    }

    private void initMasks() {
        IPreferenceStore store = PreferenceConstants.getPreferenceStore();
        fTextFlagMask = -1;
        if (!store.getBoolean(PreferenceConstants.APPEARANCE_METHOD_RETURNTYPE)) {
            fTextFlagMask ^= DartElementLabels.M_APP_RETURNTYPE;
        }
        if (!store.getBoolean(PreferenceConstants.APPEARANCE_METHOD_TYPEPARAMETERS)) {
            fTextFlagMask ^= DartElementLabels.M_APP_TYPE_PARAMETERS;
        }
        if (!store.getBoolean(PreferenceConstants.APPEARANCE_COMPRESS_PACKAGE_NAMES)) {
            fTextFlagMask ^= DartElementLabels.P_COMPRESSED;
        }
        if (!store.getBoolean(PreferenceConstants.APPEARANCE_CATEGORY)) {
            fTextFlagMask ^= DartElementLabels.ALL_CATEGORY;
        }

        fImageFlagMask = -1;
    }

}