com.android.tools.idea.uibuilder.handlers.preference.PreferenceHandler.java Source code

Introduction

Here is the source code for com.android.tools.idea.uibuilder.handlers.preference.PreferenceHandler.java

Source

/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * 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.android.tools.idea.uibuilder.handlers.preference;

import com.android.tools.idea.uibuilder.api.InsertType;
import com.android.tools.idea.uibuilder.api.ViewEditor;
import com.android.tools.idea.uibuilder.api.ViewHandler;
import com.android.tools.idea.uibuilder.api.XmlType;
import com.android.tools.idea.uibuilder.model.NlComponent;
import com.google.common.base.Strings;
import com.intellij.psi.xml.XmlTag;
import org.intellij.lang.annotations.Language;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.Arrays;

import static com.android.SdkConstants.*;
import static com.android.SdkConstants.PreferenceAttributes.ATTR_KEY;

abstract class PreferenceHandler extends ViewHandler {
    @Language("XML")
    @NotNull
    @Override
    public abstract String getXml(@NotNull String tagName, @NotNull XmlType xmlType);

    @Override
    public boolean onCreate(@NotNull ViewEditor editor, @Nullable NlComponent parent, @NotNull NlComponent newChild,
            @NotNull InsertType type) {
        if (type.equals(InsertType.CREATE)) {
            newChild.removeAndroidAttribute(ATTR_LAYOUT_WIDTH);
            newChild.removeAndroidAttribute(ATTR_LAYOUT_HEIGHT);
        }

        return true;
    }

    // TODO This generates a key unique across the file. Keys really should be unique across the application.
    @NotNull
    static String generateKey(@NotNull NlComponent component, @NotNull String tagName, @NotNull String keyPrefix) {
        XmlTag preferenceScreen = component.getModel().getFile().getRootTag();

        if (preferenceScreen == null) {
            return "";
        }

        XmlTag[] preferences = preferenceScreen.findSubTags(tagName);
        int i = 1;
        String key = keyPrefix + i++;

        while (anyPreferenceKeyEquals(preferences, key)) {
            key = keyPrefix + i++;
        }

        return key;
    }

    private static boolean anyPreferenceKeyEquals(@NotNull XmlTag[] preferences, @NotNull String key) {
        return Arrays.stream(preferences).map(preference -> preference.getAttributeValue(ATTR_KEY, ANDROID_URI))
                .anyMatch(key::equals);
    }

    @NotNull
    @Override
    public String getTitle(@NotNull NlComponent component) {
        return Strings.nullToEmpty(component.getAndroidAttribute(ATTR_TITLE));
    }
}