eclipse/plugins/com.android.ide.eclipse.ndk/src/com/android/ide/eclipse/ndk/internal/preferences/NdkPreferencePage.java

/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * 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
 *
 *      http://www.eclipse.org/org/documents/epl-v10.php
 *
 * 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.android.ide.eclipse.ndk.internal.preferences;

import com.android.ide.eclipse.ndk.internal.Activator;
import com.android.ide.eclipse.ndk.internal.Messages;
import com.android.ide.eclipse.ndk.internal.NdkManager;

import org.eclipse.jface.preference.DirectoryFieldEditor;
import org.eclipse.jface.preference.FieldEditorPreferencePage;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPreferencePage;

public class NdkPreferencePage extends FieldEditorPreferencePage implements
        IWorkbenchPreferencePage {

    private NdkDirectoryFieldEditor mNdkDirectoryEditor;

    public NdkPreferencePage() {
        super(GRID);
        setPreferenceStore(Activator.getDefault().getPreferenceStore());
        setDescription(Messages.NDKPreferencePage_Preferences);
    }

    @Override
    protected void createFieldEditors() {
        mNdkDirectoryEditor = new NdkDirectoryFieldEditor(NdkManager.NDK_LOCATION,
                Messages.NDKPreferencePage_Location, getFieldEditorParent());
        addField(mNdkDirectoryEditor);
    }

    private static class NdkDirectoryFieldEditor extends DirectoryFieldEditor {
        public NdkDirectoryFieldEditor(String name, String labelText, Composite parent) {
            super(name, labelText, parent);
            setEmptyStringAllowed(true);
        }

        @Override
        protected boolean doCheckState() {
            if (!super.doCheckState()) {
                setErrorMessage(Messages.NDKPreferencePage_not_a_valid_directory);
                return false;
            }

            String dirname = getTextControl().getText().trim();
            if (!dirname.isEmpty() && !NdkManager.isValidNdkLocation(dirname)) {
                setErrorMessage(Messages.NDKPreferencePage_not_a_valid_NDK_directory);
                return false;
            }

            return true;
        }

        @Override
        public Text getTextControl(Composite parent) {
            setValidateStrategy(VALIDATE_ON_KEY_STROKE);
            return super.getTextControl(parent);
        }

    }

    @Override
    public void init(IWorkbench workbench) {
        // Nothing to do herea
    }

    @Override
    public void dispose() {
        super.dispose();

        if (mNdkDirectoryEditor != null) {
            mNdkDirectoryEditor.dispose();
            mNdkDirectoryEditor = null;
        }
    }

}