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/*
* 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.photoeditor.actions;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.SeekBar;
import com.android.gallery3d.R;
/**
* Seek-bar base that implements a draggable thumb that fits seek-bar's track height.
*/
abstract class AbstractSeekBar extends SeekBar {
public AbstractSeekBar(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
// Scale the thumb to fit seek-bar's track height.
Resources res = getResources();
Drawable thumb = res.getDrawable(R.drawable.photoeditor_seekbar_thumb);
int height = h - getPaddingTop() - getPaddingBottom();
int scaledWidth = thumb.getIntrinsicWidth() * height / thumb.getIntrinsicHeight();
Bitmap bitmap = Bitmap.createBitmap(scaledWidth, height, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
thumb.setBounds(0, 0, bitmap.getWidth(), bitmap.getHeight());
thumb.draw(canvas);
// The thumb should not extend out of the track per UX design.
setThumb(new BitmapDrawable(res, bitmap));
setThumbOffset(0);
// The thumb position is updated here after the thumb is changed.
super.onSizeChanged(w, h, oldw, oldh);
}
}
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