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/*
* Copyright (C) 2006 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.view;
import android.content.Context;
import android.content.ContextWrapper;
import android.content.res.Resources;
import android.os.Build;
/**
* A ContextWrapper that allows you to modify the theme from what is in the
* wrapped context.
*/
public class ContextThemeWrapper extends ContextWrapper {
private Context mBase;
private int mThemeResource;
private Resources.Theme mTheme;
private LayoutInflater mInflater;
public ContextThemeWrapper() {
super(null);
}
public ContextThemeWrapper(Context base, int themeres) {
super(base);
mBase = base;
mThemeResource = themeres;
}
@Override protected void attachBaseContext(Context newBase) {
super.attachBaseContext(newBase);
mBase = newBase;
}
@Override public void setTheme(int resid) {
mThemeResource = resid;
initializeTheme();
}
/** @hide */
@Override
public int getThemeResId() {
return mThemeResource;
}
@Override public Resources.Theme getTheme() {
if (mTheme != null) {
return mTheme;
}
mThemeResource = Resources.selectDefaultTheme(mThemeResource,
getApplicationInfo().targetSdkVersion);
initializeTheme();
return mTheme;
}
@Override public Object getSystemService(String name) {
if (LAYOUT_INFLATER_SERVICE.equals(name)) {
if (mInflater == null) {
mInflater = LayoutInflater.from(mBase).cloneInContext(this);
}
return mInflater;
}
return mBase.getSystemService(name);
}
/**
* Called by {@link #setTheme} and {@link #getTheme} to apply a theme
* resource to the current Theme object. Can override to change the
* default (simple) behavior. This method will not be called in multiple
* threads simultaneously.
*
* @param theme The Theme object being modified.
* @param resid The theme style resource being applied to <var>theme</var>.
* @param first Set to true if this is the first time a style is being
* applied to <var>theme</var>.
*/
protected void onApplyThemeResource(Resources.Theme theme, int resid, boolean first) {
theme.applyStyle(resid, true);
}
private void initializeTheme() {
final boolean first = mTheme == null;
if (first) {
mTheme = getResources().newTheme();
Resources.Theme theme = mBase.getTheme();
if (theme != null) {
mTheme.setTo(theme);
}
}
onApplyThemeResource(mTheme, mThemeResource, first);
}
}
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