content: /*
   * Copyright (C) 2011 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.content.res;
  
  import com.android.ide.common.rendering.api.ResourceReference;
  import com.android.ide.common.rendering.api.StyleResourceValue;
  import com.android.layoutlib.bridge.android.BridgeContext;
  import com.android.layoutlib.bridge.impl.DelegateManager;
  import com.android.layoutlib.bridge.impl.RenderSessionImpl;
  import com.android.resources.ResourceType;
  import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
  
  import android.annotation.Nullable;
  import android.content.res.Resources.NotFoundException;
  import android.content.res.Resources.Theme;
  import android.content.res.Resources.ThemeKey;
  import android.util.AttributeSet;
  import android.util.TypedValue;
  
  /**
   * Delegate used to provide new implementation of a select few methods of {@link Resources.Theme}
   *
   * Through the layoutlib_create tool, the original  methods of Theme have been replaced
   * by calls to methods of the same name in this delegate class.
   *
   */
  public class Resources_Theme_Delegate {
  
      // ---- delegate manager ----
  
      private static final DelegateManager<Resources_Theme_Delegate> sManager =
              new DelegateManager<Resources_Theme_Delegate>(Resources_Theme_Delegate.class);
  
      public static DelegateManager<Resources_Theme_Delegate> getDelegateManager() {
          return sManager;
      }
  
      // ---- delegate methods. ----
  
      @LayoutlibDelegate
      /*package*/ static TypedArray obtainStyledAttributes(
              Resources thisResources, Theme thisTheme,
              int[] attrs) {
          boolean changed = setupResources(thisTheme);
          BridgeTypedArray ta = RenderSessionImpl.getCurrentContext().internalObtainStyledAttributes(
                  0, attrs);
          ta.setTheme(thisTheme);
          restoreResources(changed);
          return ta;
      }
  
      @LayoutlibDelegate
      /*package*/ static TypedArray obtainStyledAttributes(
              Resources thisResources, Theme thisTheme,
              int resid, int[] attrs)
              throws NotFoundException {
          boolean changed = setupResources(thisTheme);
          BridgeTypedArray ta = RenderSessionImpl.getCurrentContext().internalObtainStyledAttributes(
                  resid, attrs);
          ta.setTheme(thisTheme);
          restoreResources(changed);
          return ta;
      }
  
      @LayoutlibDelegate
      /*package*/ static TypedArray obtainStyledAttributes(
              Resources thisResources, Theme thisTheme,
              AttributeSet set, int[] attrs, int defStyleAttr, int defStyleRes) {
          boolean changed = setupResources(thisTheme);
          BridgeTypedArray ta = RenderSessionImpl.getCurrentContext().internalObtainStyledAttributes(set,
                  attrs, defStyleAttr, defStyleRes);
          ta.setTheme(thisTheme);
          restoreResources(changed);
          return ta;
      }
  
      @LayoutlibDelegate
      /*package*/ static boolean resolveAttribute(
              Resources thisResources, Theme thisTheme,
              int resid, TypedValue outValue,
              boolean resolveRefs) {
          boolean changed = setupResources(thisTheme);
          boolean found =  RenderSessionImpl.getCurrentContext().resolveThemeAttribute(resid,
                  outValue, resolveRefs);
          restoreResources(changed);
          return found;
      }
  
      @LayoutlibDelegate
      /*package*/ static TypedArray resolveAttributes(Resources thisResources, Theme thisTheme,
              int[] values, int[] attrs) {
          // FIXME
          return null;
      }
  
      // ---- private helper methods ----
  
      private static boolean setupResources(Theme thisTheme) {
          // Key is a space-separated list of theme ids applied that have been merged into the
          // BridgeContext's theme to make thisTheme.
          final ThemeKey key = thisTheme.getKey();
          final int[] resId = key.mResId;
          final boolean[] force = key.mForce;
  
          boolean changed = false;
          for (int i = 0, N = key.mCount; i < N; i++) {
              StyleResourceValue style = resolveStyle(resId[i]);
              if (style != null) {
                  RenderSessionImpl.getCurrentContext().getRenderResources().applyStyle(
                          style, force[i]);
                  changed = true;
              }
  
          }
          return changed;
      }
  
      private static void restoreResources(boolean changed) {
          if (changed) {
              RenderSessionImpl.getCurrentContext().getRenderResources().clearStyles();
          }
      }
  
      @Nullable
      private static StyleResourceValue resolveStyle(int nativeResid) {
          if (nativeResid == 0) {
              return null;
          }
          BridgeContext context = RenderSessionImpl.getCurrentContext();
          ResourceReference theme = context.resolveId(nativeResid);
          return (StyleResourceValue) context.getRenderResources().getResolvedResource(theme);
      }
  }
  