src/com/android/gallery3d/ui/SelectionDrawer.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 com.android.gallery3d.ui;

import com.android.gallery3d.common.Utils;
import com.android.gallery3d.data.Path;

import android.graphics.Rect;

/**
 * Drawer class responsible for drawing selectable frame.
 */
public abstract class SelectionDrawer {
    public static final int DATASOURCE_TYPE_NOT_CATEGORIZED = 0;
    public static final int DATASOURCE_TYPE_LOCAL = 1;
    public static final int DATASOURCE_TYPE_PICASA = 2;
    public static final int DATASOURCE_TYPE_MTP = 3;
    public static final int DATASOURCE_TYPE_CAMERA = 4;

    public abstract void prepareDrawing();
    public abstract void draw(GLCanvas canvas, Texture content,
            int width, int height, int rotation, Path path,
            int topIndex, int dataSourceType, int mediaType,
            int darkStripHeight, boolean wantCache, boolean isCaching);
    public abstract void drawFocus(GLCanvas canvas, int width, int height);

    public void draw(GLCanvas canvas, Texture content, int width, int height,
            int rotation, Path path, int mediaType) {
        draw(canvas, content, width, height, rotation, path, 0,
                DATASOURCE_TYPE_NOT_CATEGORIZED, mediaType,
                0, false, false);
    }

    public static void drawWithRotation(GLCanvas canvas, Texture content,
            int x, int y, int width, int height, int rotation) {
        if (rotation != 0) {
            canvas.save(GLCanvas.SAVE_FLAG_MATRIX);
            canvas.rotate(rotation, 0, 0, 1);
        }

        content.draw(canvas, x, y, width, height);

        if (rotation != 0) {
            canvas.restore();
        }
    }

    public static void drawWithRotationAndGray(GLCanvas canvas, Texture content,
                int x, int y, int width, int height, int rotation,
                int topIndex) {
        if (rotation != 0) {
            canvas.save(GLCanvas.SAVE_FLAG_MATRIX);
            canvas.rotate(rotation, 0, 0, 1);
        }

        if (topIndex > 0 && (content instanceof BasicTexture)) {
            float ratio = Utils.clamp(0.3f + 0.2f * topIndex, 0f, 1f);
            canvas.drawMixed((BasicTexture) content, 0xFF222222, ratio,
                    x, y, width, height);
        } else {
            content.draw(canvas, x, y, width, height);
        }

        if (rotation != 0) {
            canvas.restore();
        }
    }

    public static void drawFrame(GLCanvas canvas, NinePatchTexture frame,
            int x, int y, int width, int height) {
        Rect p = frame.getPaddings();
        frame.draw(canvas, x - p.left, y - p.top, width + p.left + p.right,
                 height + p.top + p.bottom);
    }
}