com.android.tools.idea.editors.strings.FontUtil.java Source code

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Here is the source code for com.android.tools.idea.editors.strings.FontUtil.java

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/*
 * Copyright (C) 2014 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.editors.strings;

import com.google.common.collect.Sets;
import com.intellij.openapi.editor.colors.EditorColorsManager;
import com.intellij.openapi.editor.colors.FontPreferences;
import com.intellij.openapi.editor.impl.ComplementaryFontsRegistry;
import com.intellij.openapi.util.SystemInfo;
import org.jetbrains.annotations.NotNull;

import java.awt.*;
import java.util.Set;

public class FontUtil {
    @NotNull
    public static Font getFontAbleToDisplay(@NotNull String s, @NotNull Font defaultFont) {
        if (SystemInfo.isMac // On Macs, all fonts can display all the characters because the system renders using fallback fonts.
                || isExtendedAscii(s)) { // Assume that default font can handle ASCII
            return defaultFont;
        }

        Set<Font> fonts = Sets.newHashSetWithExpectedSize(10);

        FontPreferences fontPreferences = EditorColorsManager.getInstance().getGlobalScheme().getFontPreferences();
        for (int i = 0; i < s.length(); i++) {
            if (s.charAt(i) > 255) {
                fonts.add(ComplementaryFontsRegistry
                        .getFontAbleToDisplay(s.charAt(i), Font.PLAIN, fontPreferences, null).getFont());
            }
        }

        if (fonts.isEmpty()) {
            return defaultFont;
        }

        // find the font the can handle the most # of characters
        Font bestFont = defaultFont;
        int max = 0;
        for (Font f : fonts) {
            int supportedChars = 0;
            for (int i = 0; i < s.length(); i++) {
                if (f.canDisplay(s.charAt(i))) {
                    supportedChars++;
                }
            }

            if (supportedChars > max) {
                max = supportedChars;
                bestFont = f;
            }
        }

        return bestFont;
    }

    private static boolean isExtendedAscii(@NotNull String s) {
        for (int i = 0; i < s.length(); i++) {
            if (s.charAt(i) > 255) {
                return false;
            }
        }

        return true;
    }
}