1/* 2 * Copyright (C) 2013 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.content.res.TypedArray; 21import android.graphics.Color; 22import android.support.annotation.IntDef; 23import android.support.v4.graphics.ColorUtils; 24import android.support.v7.mediarouter.R; 25import android.util.TypedValue; 26import android.view.ContextThemeWrapper; 27import android.view.View; 28 29import java.lang.annotation.Retention; 30import java.lang.annotation.RetentionPolicy; 31 32final class MediaRouterThemeHelper { 33 private static final float MIN_CONTRAST = 3.0f; 34 35 @IntDef({COLOR_DARK_ON_LIGHT_BACKGROUND, COLOR_WHITE_ON_DARK_BACKGROUND}) 36 @Retention(RetentionPolicy.SOURCE) 37 private @interface ControllerColorType {} 38 39 static final int COLOR_DARK_ON_LIGHT_BACKGROUND = 0xDE000000; /* Opacity of 87% */ 40 static final int COLOR_WHITE_ON_DARK_BACKGROUND = Color.WHITE; 41 42 private MediaRouterThemeHelper() { 43 } 44 45 /** 46 * Creates a themed context based on the explicit style resource or the parent context's default 47 * theme. 48 * <p> 49 * The theme which will be applied on top of the parent {@code context}'s theme is determined 50 * by the primary color defined in the given {@code style}, or in the parent {@code context}. 51 * 52 * @param context the parent context 53 * @param style the resource ID of the style against which to inflate this context, or 54 * {@code 0} to use the parent {@code context}'s default theme. 55 * @return The themed context. 56 */ 57 public static Context createThemedContext(Context context, int style) { 58 // First, apply dialog property overlay. 59 60 int theme; 61 if (isLightTheme(context)) { 62 if (getControllerColor(context, style) == COLOR_DARK_ON_LIGHT_BACKGROUND) { 63 theme = R.style.Theme_MediaRouter_Light; 64 } else { 65 theme = R.style.Theme_MediaRouter_Light_DarkControlPanel; 66 } 67 } else { 68 if (getControllerColor(context, style) == COLOR_DARK_ON_LIGHT_BACKGROUND) { 69 theme = R.style.Theme_MediaRouter_LightControlPanel; 70 } else { 71 theme = R.style.Theme_MediaRouter; 72 } 73 } 74 int mediaRouteThemeResId = getThemeResource(context, R.attr.mediaRouteTheme); 75 Context themedContext = new ContextThemeWrapper(context, theme); 76 if (mediaRouteThemeResId != 0) { 77 themedContext = new ContextThemeWrapper(themedContext, mediaRouteThemeResId); 78 } 79 return themedContext; 80 } 81 82 public static int getThemeResource(Context context, int attr) { 83 TypedValue value = new TypedValue(); 84 return context.getTheme().resolveAttribute(attr, value, true) ? value.resourceId : 0; 85 } 86 87 public static float getDisabledAlpha(Context context) { 88 TypedValue value = new TypedValue(); 89 return context.getTheme().resolveAttribute(android.R.attr.disabledAlpha, value, true) 90 ? value.getFloat() : 0.5f; 91 } 92 93 public static @ControllerColorType int getControllerColor(Context context, int style) { 94 int primaryColor = getThemeColor(context, style, 95 android.support.v7.appcompat.R.attr.colorPrimary); 96 if (ColorUtils.calculateContrast(COLOR_WHITE_ON_DARK_BACKGROUND, primaryColor) 97 >= MIN_CONTRAST) { 98 return COLOR_WHITE_ON_DARK_BACKGROUND; 99 } 100 return COLOR_DARK_ON_LIGHT_BACKGROUND; 101 } 102 103 public static int getButtonTextColor(Context context) { 104 int primaryColor = getThemeColor(context, 0, 105 android.support.v7.appcompat.R.attr.colorPrimary); 106 int backgroundColor = getThemeColor(context, 0, android.R.attr.colorBackground); 107 108 if (ColorUtils.calculateContrast(primaryColor, backgroundColor) < MIN_CONTRAST) { 109 // Default to colorAccent if the contrast ratio is low. 110 return getThemeColor(context, 0, android.support.v7.appcompat.R.attr.colorAccent); 111 } 112 return primaryColor; 113 } 114 115 public static void setMediaControlsBackgroundColor( 116 Context context, View mainControls, View groupControls, boolean hasGroup) { 117 int primaryColor = getThemeColor(context, 0, 118 android.support.v7.appcompat.R.attr.colorPrimary); 119 int primaryDarkColor = getThemeColor(context, 0, 120 android.support.v7.appcompat.R.attr.colorPrimaryDark); 121 if (hasGroup && getControllerColor(context, 0) == COLOR_DARK_ON_LIGHT_BACKGROUND) { 122 // Instead of showing dark controls in a possibly dark (i.e. the primary dark), model 123 // the white dialog and use the primary color for the group controls. 124 primaryDarkColor = primaryColor; 125 primaryColor = Color.WHITE; 126 } 127 mainControls.setBackgroundColor(primaryColor); 128 groupControls.setBackgroundColor(primaryDarkColor); 129 // Also store the background colors to the view tags. They are used in 130 // setVolumeSliderColor() below. 131 mainControls.setTag(primaryColor); 132 groupControls.setTag(primaryDarkColor); 133 } 134 135 public static void setVolumeSliderColor( 136 Context context, MediaRouteVolumeSlider volumeSlider, View backgroundView) { 137 int controllerColor = getControllerColor(context, 0); 138 if (Color.alpha(controllerColor) != 0xFF) { 139 // Composite with the background in order not to show the underlying progress bar 140 // through the thumb. 141 int backgroundColor = (int) backgroundView.getTag(); 142 controllerColor = ColorUtils.compositeColors(controllerColor, backgroundColor); 143 } 144 volumeSlider.setColor(controllerColor); 145 } 146 147 // This is copied from {@link AlertDialog#resolveDialogTheme} to pre-evaluate theme in advance. 148 public static int getAlertDialogResolvedTheme(Context context, int themeResId) { 149 if (themeResId >= 0x01000000) { // start of real resource IDs. 150 return themeResId; 151 } else { 152 TypedValue outValue = new TypedValue(); 153 context.getTheme().resolveAttribute( 154 android.support.v7.appcompat.R.attr.alertDialogTheme, outValue, true); 155 return outValue.resourceId; 156 } 157 } 158 159 private static boolean isLightTheme(Context context) { 160 TypedValue value = new TypedValue(); 161 return context.getTheme().resolveAttribute( 162 android.support.v7.appcompat.R.attr.isLightTheme, value, true) 163 && value.data != 0; 164 } 165 166 private static int getThemeColor(Context context, int style, int attr) { 167 if (style != 0) { 168 int[] attrs = { attr }; 169 TypedArray ta = context.obtainStyledAttributes(style, attrs); 170 int color = ta.getColor(0, 0); 171 ta.recycle(); 172 if (color != 0) { 173 return color; 174 } 175 } 176 TypedValue value = new TypedValue(); 177 context.getTheme().resolveAttribute(attr, value, true); 178 if (value.resourceId != 0) { 179 return context.getResources().getColor(value.resourceId); 180 } 181 return value.data; 182 } 183} 184