1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package android.support.v7.app;
18
19import android.content.Context;
20import android.graphics.Color;
21import android.graphics.PorterDuff;
22import android.graphics.drawable.Drawable;
23import android.support.v7.mediarouter.R;
24import android.support.v7.widget.AppCompatSeekBar;
25import android.util.AttributeSet;
26import android.util.Log;
27
28/**
29 * Volume slider with showing, hiding, and applying alpha supports to the thumb.
30 */
31class MediaRouteVolumeSlider extends AppCompatSeekBar {
32    private static final String TAG = "MediaRouteVolumeSlider";
33
34    private final float mDisabledAlpha;
35
36    private boolean mHideThumb;
37    private Drawable mThumb;
38    private int mColor;
39
40    public MediaRouteVolumeSlider(Context context) {
41        this(context, null);
42    }
43
44    public MediaRouteVolumeSlider(Context context, AttributeSet attrs) {
45        this(context, attrs, android.support.v7.appcompat.R.attr.seekBarStyle);
46    }
47
48    public MediaRouteVolumeSlider(Context context, AttributeSet attrs, int defStyleAttr) {
49        super(context, attrs, defStyleAttr);
50        mDisabledAlpha = MediaRouterThemeHelper.getDisabledAlpha(context);
51    }
52
53    @Override
54    protected void drawableStateChanged() {
55        super.drawableStateChanged();
56        int alpha = isEnabled() ? 0xFF : (int) (0xFF * mDisabledAlpha);
57
58        // The thumb drawable is a collection of drawables and its current drawables are changed per
59        // state. Apply the color filter and alpha on every state change.
60        mThumb.setColorFilter(mColor, PorterDuff.Mode.SRC_IN);
61        mThumb.setAlpha(alpha);
62
63        getProgressDrawable().setColorFilter(mColor, PorterDuff.Mode.SRC_IN);
64        getProgressDrawable().setAlpha(alpha);
65    }
66
67    @Override
68    public void setThumb(Drawable thumb) {
69        mThumb = thumb;
70        super.setThumb(mHideThumb ? null : mThumb);
71    }
72
73    /**
74     * Sets whether to show or hide thumb.
75     */
76    public void setHideThumb(boolean hideThumb) {
77        if (mHideThumb == hideThumb) {
78            return;
79        }
80        mHideThumb = hideThumb;
81        super.setThumb(mHideThumb ? null : mThumb);
82    }
83
84    /**
85     * Sets the volume slider color. The change takes effect next time drawable state is changed.
86     * <p>
87     * The color cannot be translucent, otherwise the underlying progress bar will be seen through
88     * the thumb.
89     * </p>
90     */
91    public void setColor(int color) {
92        if (mColor == color) {
93            return;
94        }
95        if (Color.alpha(color) != 0xFF) {
96            Log.e(TAG, "Volume slider color cannot be translucent: #" + Integer.toHexString(color));
97        }
98        mColor = color;
99    }
100}
101