bridge/src/android/graphics/Typeface_Delegate.java

/*
 * Copyright (C) 2010 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 android.graphics;

import com.android.layoutlib.bridge.DelegateManager;
import com.android.layoutlib.bridge.FontLoader;

import android.content.res.AssetManager;

import java.awt.Font;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * Delegate implementing the native methods of android.graphics.Typeface
 *
 * Through the layoutlib_create tool, the original native methods of Typeface have been replaced
 * by calls to methods of the same name in this delegate class.
 *
 * This class behaves like the original native implementation, but in Java, keeping previously
 * native data into its own objects and mapping them to int that are sent back and forth between
 * it and the original Typeface class.
 *
 * @see DelegateManager
 *
 */
public final class Typeface_Delegate {

    // ---- delegate manager ----
    private static final DelegateManager<Typeface_Delegate> sManager =
            new DelegateManager<Typeface_Delegate>();

    // ---- delegate helper data ----
    private static final String DEFAULT_FAMILY = "sans-serif";
    private static final int[] STYLE_BUFFER = new int[1];

    private static FontLoader sFontLoader;
    private static final List<Typeface_Delegate> sPostInitDelegate =
            new ArrayList<Typeface_Delegate>();

    // ---- delegate data ----

    private final String mFamily;
    private int mStyle;
    private List<Font> mFonts;


    // ---- Public Helper methods ----

    public static synchronized void init(FontLoader fontLoader) {
        sFontLoader = fontLoader;

        for (Typeface_Delegate delegate : sPostInitDelegate) {
            delegate.init();
        }
        sPostInitDelegate.clear();
    }

    public static List<Font> getFonts(Typeface typeface) {
        Typeface_Delegate delegate = sManager.getDelegate(typeface.native_instance);
        if (delegate == null) {
            assert false;
            return null;
        }

        return delegate.mFonts;
    }


    // ---- native methods ----

    /*package*/ static synchronized int nativeCreate(String familyName, int style) {
        if (familyName == null) {
            familyName = DEFAULT_FAMILY;
        }

        Typeface_Delegate newDelegate = new Typeface_Delegate(familyName, style);
        if (sFontLoader != null) {
            newDelegate.init();
        } else {
            // font loader has not been initialized yet, add the delegate to a list of delegates
            // to init when the font loader is initialized.
            // There won't be any rendering before this happens anyway.
            sPostInitDelegate.add(newDelegate);
        }

        return sManager.addDelegate(newDelegate);
    }

    /*package*/ static synchronized int nativeCreateFromTypeface(int native_instance, int style) {
        Typeface_Delegate delegate = sManager.getDelegate(native_instance);
        if (delegate == null) {
            assert false;
            return 0;
        }

        Typeface_Delegate newDelegate = new Typeface_Delegate(delegate.mFamily, style);
        if (sFontLoader != null) {
            newDelegate.init();
        } else {
            // font loader has not been initialized yet, add the delegate to a list of delegates
            // to init when the font loader is initialized.
            // There won't be any rendering before this happens anyway.
            sPostInitDelegate.add(newDelegate);
        }

        return sManager.addDelegate(newDelegate);
    }

    /*package*/ static synchronized int nativeCreateFromAsset(AssetManager mgr, String path) {
        // FIXME
        throw new UnsupportedOperationException("Native delegate needed: Typeface_Delegate.nativeCreateFromAsset");
    }

    /*package*/ static synchronized int nativeCreateFromFile(String path) {
        // FIXME
        throw new UnsupportedOperationException("Native delegate needed: Typeface_Delegate.nativeCreateFromFile");
    }

    /*package*/ static void nativeUnref(int native_instance) {
        sManager.removeDelegate(native_instance);
    }

    /*package*/ static int nativeGetStyle(int native_instance) {
        Typeface_Delegate delegate = sManager.getDelegate(native_instance);
        if (delegate == null) {
            assert false;
            return 0;
        }

        return delegate.mStyle;
    }

    /*package*/ static void setGammaForText(float blackGamma, float whiteGamma) {
        // This is for device testing only: pass
    }

    // ---- Private delegate/helper methods ----

    private Typeface_Delegate(String family, int style) {
        mFamily = family;
        mStyle = style;
    }

    private void init() {
        STYLE_BUFFER[0] = mStyle;
        Font font = sFontLoader.getFont(mFamily, STYLE_BUFFER);
        if (font != null) {
            List<Font> list = new ArrayList<Font>();
            list.add(font);
            list.addAll(sFontLoader.getFallBackFonts());
            mFonts = Collections.unmodifiableList(list);
            mStyle = STYLE_BUFFER[0];
        }
    }
}