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/*
* 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;
}
}
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