GLOptionHeader.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.lightbox.android.camera.ui;

import static com.lightbox.android.camera.ui.GLRootView.dpToPixel;
import android.content.Context;
import android.graphics.Rect;

import javax.microedition.khronos.opengles.GL11;

import com.lightbox.android.camera.ui.ColorTexture;
import com.lightbox.android.camera.ui.GLRootView;
import com.lightbox.android.camera.ui.GLView;
import com.lightbox.android.camera.ui.MeasureHelper;
import com.lightbox.android.camera.ui.StringTexture;
import com.lightbox.android.camera.ui.Texture;

class GLOptionHeader extends GLView {
    private static final int FONT_COLOR = 0xFF666666;
    private static final float FONT_SIZE = 12;
    private static final int HORIZONTAL_PADDINGS = 4;
    private static final int VERTICAL_PADDINGS = 2;
    private static final int COLOR_OPTION_HEADER = 0xFF1D1D1D;

    private static int sHorizontalPaddings = -1;
    private static int sVerticalPaddings;

    private final StringTexture mTitle;
    private Texture mBackground;

    private static void initializeStaticVariables(Context context) {
        if (sHorizontalPaddings >= 0) return;
        sHorizontalPaddings = dpToPixel(context, HORIZONTAL_PADDINGS);
        sVerticalPaddings = dpToPixel(context, VERTICAL_PADDINGS);
    }

    public GLOptionHeader(Context context, String title) {
        initializeStaticVariables(context);

        float fontSize = GLRootView.dpToPixel(context, FONT_SIZE);
        mTitle = StringTexture.newInstance(title, fontSize, FONT_COLOR);
        setBackground(new ColorTexture(COLOR_OPTION_HEADER));
        setPaddings(sHorizontalPaddings,
                sVerticalPaddings, sHorizontalPaddings, sVerticalPaddings);
    }

    public void setBackground(Texture background) {
        if (mBackground == background) return;
        mBackground = background;
        invalidate();
    }

    @Override
    protected void onMeasure(int widthSpec, int heightSpec) {
        new MeasureHelper(this)
                .setPreferredContentSize(mTitle.getWidth(), mTitle.getHeight())
                .measure(widthSpec, heightSpec);
    }

    @Override
    protected void render(GLRootView root, GL11 gl) {
        if (mBackground != null) {
            mBackground.draw(root, 0, 0, getWidth(), getHeight());
        }
        Rect p = mPaddings;
        mTitle.draw(root, p.left, p.top);
    }
}