| /* |
| * Copyright (C) 2013 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 android.support.v7.app; |
| |
| import android.content.Context; |
| import android.content.res.TypedArray; |
| import android.graphics.Color; |
| import android.support.annotation.IntDef; |
| import android.support.v4.graphics.ColorUtils; |
| import android.support.v7.mediarouter.R; |
| import android.util.TypedValue; |
| import android.view.ContextThemeWrapper; |
| import android.view.View; |
| |
| import java.lang.annotation.Retention; |
| import java.lang.annotation.RetentionPolicy; |
| |
| final class MediaRouterThemeHelper { |
| private static final float MIN_CONTRAST = 3.0f; |
| |
| @IntDef({COLOR_DARK_ON_LIGHT_BACKGROUND, COLOR_WHITE_ON_DARK_BACKGROUND}) |
| @Retention(RetentionPolicy.SOURCE) |
| private @interface ControllerColorType {} |
| |
| static final int COLOR_DARK_ON_LIGHT_BACKGROUND = 0xDE000000; /* Opacity of 87% */ |
| static final int COLOR_WHITE_ON_DARK_BACKGROUND = Color.WHITE; |
| |
| private MediaRouterThemeHelper() { |
| } |
| |
| /** |
| * Creates a themed context based on the explicit style resource or the parent context's default |
| * theme. |
| * <p> |
| * The theme which will be applied on top of the parent {@code context}'s theme is determined |
| * by the primary color defined in the given {@code style}, or in the parent {@code context}. |
| * |
| * @param context the parent context |
| * @param style the resource ID of the style against which to inflate this context, or |
| * {@code 0} to use the parent {@code context}'s default theme. |
| * @return The themed context. |
| */ |
| static Context createThemedContext(Context context, int style) { |
| // First, apply dialog property overlay. |
| Context themedContext = |
| new ContextThemeWrapper(context, getStyledRouterThemeId(context, style)); |
| int customizedThemeId = getThemeResource(context, R.attr.mediaRouteTheme); |
| return customizedThemeId == 0 ? themedContext |
| : new ContextThemeWrapper(themedContext, customizedThemeId); |
| } |
| |
| /** |
| * Creates the theme resource ID intended to be used by dialogs. |
| */ |
| static int createThemeForDialog(Context context, int style) { |
| int customizedThemeId = getThemeResource(context, R.attr.mediaRouteTheme); |
| return customizedThemeId != 0 ? customizedThemeId : getStyledRouterThemeId(context, style); |
| } |
| |
| public static int getThemeResource(Context context, int attr) { |
| TypedValue value = new TypedValue(); |
| return context.getTheme().resolveAttribute(attr, value, true) ? value.resourceId : 0; |
| } |
| |
| public static float getDisabledAlpha(Context context) { |
| TypedValue value = new TypedValue(); |
| return context.getTheme().resolveAttribute(android.R.attr.disabledAlpha, value, true) |
| ? value.getFloat() : 0.5f; |
| } |
| |
| public static @ControllerColorType int getControllerColor(Context context, int style) { |
| int primaryColor = getThemeColor(context, style, |
| android.support.v7.appcompat.R.attr.colorPrimary); |
| if (ColorUtils.calculateContrast(COLOR_WHITE_ON_DARK_BACKGROUND, primaryColor) |
| >= MIN_CONTRAST) { |
| return COLOR_WHITE_ON_DARK_BACKGROUND; |
| } |
| return COLOR_DARK_ON_LIGHT_BACKGROUND; |
| } |
| |
| public static int getButtonTextColor(Context context) { |
| int primaryColor = getThemeColor(context, 0, |
| android.support.v7.appcompat.R.attr.colorPrimary); |
| int backgroundColor = getThemeColor(context, 0, android.R.attr.colorBackground); |
| |
| if (ColorUtils.calculateContrast(primaryColor, backgroundColor) < MIN_CONTRAST) { |
| // Default to colorAccent if the contrast ratio is low. |
| return getThemeColor(context, 0, android.support.v7.appcompat.R.attr.colorAccent); |
| } |
| return primaryColor; |
| } |
| |
| public static void setMediaControlsBackgroundColor( |
| Context context, View mainControls, View groupControls, boolean hasGroup) { |
| int primaryColor = getThemeColor(context, 0, |
| android.support.v7.appcompat.R.attr.colorPrimary); |
| int primaryDarkColor = getThemeColor(context, 0, |
| android.support.v7.appcompat.R.attr.colorPrimaryDark); |
| if (hasGroup && getControllerColor(context, 0) == COLOR_DARK_ON_LIGHT_BACKGROUND) { |
| // Instead of showing dark controls in a possibly dark (i.e. the primary dark), model |
| // the white dialog and use the primary color for the group controls. |
| primaryDarkColor = primaryColor; |
| primaryColor = Color.WHITE; |
| } |
| mainControls.setBackgroundColor(primaryColor); |
| groupControls.setBackgroundColor(primaryDarkColor); |
| // Also store the background colors to the view tags. They are used in |
| // setVolumeSliderColor() below. |
| mainControls.setTag(primaryColor); |
| groupControls.setTag(primaryDarkColor); |
| } |
| |
| public static void setVolumeSliderColor( |
| Context context, MediaRouteVolumeSlider volumeSlider, View backgroundView) { |
| int controllerColor = getControllerColor(context, 0); |
| if (Color.alpha(controllerColor) != 0xFF) { |
| // Composite with the background in order not to show the underlying progress bar |
| // through the thumb. |
| int backgroundColor = (int) backgroundView.getTag(); |
| controllerColor = ColorUtils.compositeColors(controllerColor, backgroundColor); |
| } |
| volumeSlider.setColor(controllerColor); |
| } |
| |
| // This is copied from {@link AlertDialog#resolveDialogTheme} to pre-evaluate theme in advance. |
| public static int getAlertDialogResolvedTheme(Context context, int themeResId) { |
| if (themeResId >= 0x01000000) { // start of real resource IDs. |
| return themeResId; |
| } else { |
| TypedValue outValue = new TypedValue(); |
| context.getTheme().resolveAttribute( |
| android.support.v7.appcompat.R.attr.alertDialogTheme, outValue, true); |
| return outValue.resourceId; |
| } |
| } |
| |
| private static boolean isLightTheme(Context context) { |
| TypedValue value = new TypedValue(); |
| return context.getTheme().resolveAttribute( |
| android.support.v7.appcompat.R.attr.isLightTheme, value, true) |
| && value.data != 0; |
| } |
| |
| private static int getThemeColor(Context context, int style, int attr) { |
| if (style != 0) { |
| int[] attrs = { attr }; |
| TypedArray ta = context.obtainStyledAttributes(style, attrs); |
| int color = ta.getColor(0, 0); |
| ta.recycle(); |
| if (color != 0) { |
| return color; |
| } |
| } |
| TypedValue value = new TypedValue(); |
| context.getTheme().resolveAttribute(attr, value, true); |
| if (value.resourceId != 0) { |
| return context.getResources().getColor(value.resourceId); |
| } |
| return value.data; |
| } |
| |
| private static int getStyledRouterThemeId(Context context, int style) { |
| int themeId; |
| if (isLightTheme(context)) { |
| if (getControllerColor(context, style) == COLOR_DARK_ON_LIGHT_BACKGROUND) { |
| themeId = R.style.Theme_MediaRouter_Light; |
| } else { |
| themeId = R.style.Theme_MediaRouter_Light_DarkControlPanel; |
| } |
| } else { |
| if (getControllerColor(context, style) == COLOR_DARK_ON_LIGHT_BACKGROUND) { |
| themeId = R.style.Theme_MediaRouter_LightControlPanel; |
| } else { |
| themeId = R.style.Theme_MediaRouter; |
| } |
| } |
| return themeId; |
| } |
| } |