com.google.gapid.views.ContextSelector.java Source code

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Here is the source code for com.google.gapid.views.ContextSelector.java

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/*
 * Copyright (C) 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * 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.gapid.views;

import static com.google.gapid.widgets.Widgets.createDropDownViewer;

import com.google.gapid.models.ApiContext;
import com.google.gapid.models.ApiContext.FilteringContext;
import com.google.gapid.models.Models;

import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.ComboViewer;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;

/**
 * Dropdown that allows the user to select which API context to filter the commands by.
 */
public class ContextSelector extends Composite implements ApiContext.Listener {
    private final Models models;
    private final ComboViewer contextCombo;

    public ContextSelector(Composite parent, Models models) {
        super(parent, SWT.NONE);
        this.models = models;

        setLayout(new FillLayout(SWT.VERTICAL));
        contextCombo = createDropDownViewer(this);
        contextCombo.setContentProvider(ArrayContentProvider.getInstance());
        contextCombo.setLabelProvider(new LabelProvider());

        models.contexts.addListener(this);
        addListener(SWT.Dispose, e -> {
            models.contexts.removeListener(this);
        });

        contextCombo.getCombo().addListener(SWT.Selection, (e) -> {
            int selection = contextCombo.getCombo().getSelectionIndex();
            if (selection >= 0 && selection < models.contexts.count()) {
                models.contexts.selectContext(models.contexts.getData()[selection]);
            }
        });
    }

    @Override
    public void onContextsLoaded() {
        if (!models.contexts.isLoaded()) {
            return;
        }

        contextCombo.setInput(models.contexts.getData());
        contextCombo.refresh();

        onContextSelected(models.contexts.getSelectedContext());
    }

    @Override
    public void onContextSelected(FilteringContext context) {
        contextCombo.setSelection(new StructuredSelection(context));
    }
}