content: package com.actionbarsherlock.internal.widget;
  
  import com.actionbarsherlock.R;
  
  import android.content.Context;
  import android.content.res.Resources;
  import android.database.DataSetObserver;
  import android.graphics.Rect;
  import android.graphics.drawable.Drawable;
  import android.os.Build;
  import android.os.Handler;
  import android.util.AttributeSet;
  import android.view.ContextThemeWrapper;
  import android.view.MotionEvent;
  import android.view.View;
  import android.view.View.MeasureSpec;
  import android.view.View.OnTouchListener;
  import android.view.ViewGroup;
  import android.view.ViewParent;
  import android.widget.AbsListView;
  import android.widget.AdapterView;
  import android.widget.LinearLayout;
  import android.widget.ListAdapter;
  import android.widget.ListView;
  import android.widget.PopupWindow;
  
  /**
   * A proxy between pre- and post-Honeycomb implementations of this class.
   */
  public class IcsListPopupWindow {
      /**
       * This value controls the length of time that the user
       * must leave a pointer down without scrolling to expand
       * the autocomplete dropdown list to cover the IME.
       */
      private static final int EXPAND_LIST_TIMEOUT = 250;
  
      private Context mContext;
      private PopupWindow mPopup;
      private ListAdapter mAdapter;
      private DropDownListView mDropDownList;
  
      private int mDropDownHeight = ViewGroup.LayoutParams.WRAP_CONTENT;
      private int mDropDownWidth = ViewGroup.LayoutParams.WRAP_CONTENT;
      private int mDropDownHorizontalOffset;
      private int mDropDownVerticalOffset;
      private boolean mDropDownVerticalOffsetSet;
  
      private int mListItemExpandMaximum = Integer.MAX_VALUE;
  
      private View mPromptView;
      private int mPromptPosition = POSITION_PROMPT_ABOVE;
  
      private DataSetObserver mObserver;
  
      private View mDropDownAnchorView;
  
      private Drawable mDropDownListHighlight;
  
      private AdapterView.OnItemClickListener mItemClickListener;
      private AdapterView.OnItemSelectedListener mItemSelectedListener;
  
      private final ResizePopupRunnable mResizePopupRunnable = new ResizePopupRunnable();
      private final PopupTouchInterceptor mTouchInterceptor = new PopupTouchInterceptor();
      private final PopupScrollListener mScrollListener = new PopupScrollListener();
      private final ListSelectorHider mHideSelector = new ListSelectorHider();
  
      private Handler mHandler = new Handler();
  
      private Rect mTempRect = new Rect();
  
      private boolean mModal;
  
      public static final int POSITION_PROMPT_ABOVE = 0;
      public static final int POSITION_PROMPT_BELOW = 1;
  
      public IcsListPopupWindow(Context context) {
          this(context, null, R.attr.listPopupWindowStyle);
      }
  
      public IcsListPopupWindow(Context context, AttributeSet attrs, int defStyleAttr) {
          mContext = context;
          mPopup = new PopupWindow(context, attrs, defStyleAttr);
          mPopup.setInputMethodMode(PopupWindow.INPUT_METHOD_NEEDED);
      }
  
      public IcsListPopupWindow(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
          mContext = context;
          if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB) {
              Context wrapped = new ContextThemeWrapper(context, defStyleRes);
              mPopup = new PopupWindow(wrapped, attrs, defStyleAttr);
          } else {
              mPopup = new PopupWindow(context, attrs, defStyleAttr, defStyleRes);
          }
          mPopup.setInputMethodMode(PopupWindow.INPUT_METHOD_NEEDED);
      }
  
      public void setAdapter(ListAdapter adapter) {
          if (mObserver == null) {
              mObserver = new PopupDataSetObserver();
          } else if (mAdapter != null) {
              mAdapter.unregisterDataSetObserver(mObserver);
          }
          mAdapter = adapter;
          if (mAdapter != null) {
              adapter.registerDataSetObserver(mObserver);
          }
  
          if (mDropDownList != null) {
              mDropDownList.setAdapter(mAdapter);
          }
      }
  
      public void setPromptPosition(int position) {
          mPromptPosition = position;
      }
  
      public void setModal(boolean modal) {
          mModal = true;
          mPopup.setFocusable(modal);
      }
  
      public void setBackgroundDrawable(Drawable d) {
          mPopup.setBackgroundDrawable(d);
      }
  
      public void setAnchorView(View anchor) {
          mDropDownAnchorView = anchor;
      }
  
      public void setHorizontalOffset(int offset) {
          mDropDownHorizontalOffset = offset;
      }
  
      public void setVerticalOffset(int offset) {
          mDropDownVerticalOffset = offset;
          mDropDownVerticalOffsetSet = true;
      }
  
      public void setContentWidth(int width) {
          Drawable popupBackground = mPopup.getBackground();
          if (popupBackground != null) {
              popupBackground.getPadding(mTempRect);
              mDropDownWidth = mTempRect.left + mTempRect.right + width;
          } else {
              mDropDownWidth = width;
          }
      }
  
      public void setOnItemClickListener(AdapterView.OnItemClickListener clickListener) {
          mItemClickListener = clickListener;
      }
  
      public void show() {
          int height = buildDropDown();
  
          int widthSpec = 0;
          int heightSpec = 0;
  
          boolean noInputMethod = isInputMethodNotNeeded();
          //XXX mPopup.setAllowScrollingAnchorParent(!noInputMethod);
  
          if (mPopup.isShowing()) {
              if (mDropDownWidth == ViewGroup.LayoutParams.MATCH_PARENT) {
                  // The call to PopupWindow's update method below can accept -1 for any
                  // value you do not want to update.
                  widthSpec = -1;
              } else if (mDropDownWidth == ViewGroup.LayoutParams.WRAP_CONTENT) {
                  widthSpec = mDropDownAnchorView.getWidth();
              } else {
                  widthSpec = mDropDownWidth;
              }
  
              if (mDropDownHeight == ViewGroup.LayoutParams.MATCH_PARENT) {
                  // The call to PopupWindow's update method below can accept -1 for any
                  // value you do not want to update.
                  heightSpec = noInputMethod ? height : ViewGroup.LayoutParams.MATCH_PARENT;
                  if (noInputMethod) {
                      mPopup.setWindowLayoutMode(
                              mDropDownWidth == ViewGroup.LayoutParams.MATCH_PARENT ?
                                      ViewGroup.LayoutParams.MATCH_PARENT : 0, 0);
                  } else {
                      mPopup.setWindowLayoutMode(
                              mDropDownWidth == ViewGroup.LayoutParams.MATCH_PARENT ?
                                      ViewGroup.LayoutParams.MATCH_PARENT : 0,
                              ViewGroup.LayoutParams.MATCH_PARENT);
                  }
              } else if (mDropDownHeight == ViewGroup.LayoutParams.WRAP_CONTENT) {
                  heightSpec = height;
              } else {
                  heightSpec = mDropDownHeight;
              }
  
              mPopup.setOutsideTouchable(true);
  
              mPopup.update(mDropDownAnchorView, mDropDownHorizontalOffset,
                      mDropDownVerticalOffset, widthSpec, heightSpec);
          } else {
              if (mDropDownWidth == ViewGroup.LayoutParams.MATCH_PARENT) {
                  widthSpec = ViewGroup.LayoutParams.MATCH_PARENT;
              } else {
                  if (mDropDownWidth == ViewGroup.LayoutParams.WRAP_CONTENT) {
                      mPopup.setWidth(mDropDownAnchorView.getWidth());
                  } else {
                      mPopup.setWidth(mDropDownWidth);
                  }
              }
  
              if (mDropDownHeight == ViewGroup.LayoutParams.MATCH_PARENT) {
                  heightSpec = ViewGroup.LayoutParams.MATCH_PARENT;
              } else {
                  if (mDropDownHeight == ViewGroup.LayoutParams.WRAP_CONTENT) {
                      mPopup.setHeight(height);
                  } else {
                      mPopup.setHeight(mDropDownHeight);
                  }
              }
  
              mPopup.setWindowLayoutMode(widthSpec, heightSpec);
              //XXX mPopup.setClipToScreenEnabled(true);
  
              // use outside touchable to dismiss drop down when touching outside of it, so
              // only set this if the dropdown is not always visible
              mPopup.setOutsideTouchable(true);
              mPopup.setTouchInterceptor(mTouchInterceptor);
              mPopup.showAsDropDown(mDropDownAnchorView,
                      mDropDownHorizontalOffset, mDropDownVerticalOffset);
              mDropDownList.setSelection(ListView.INVALID_POSITION);
  
              if (!mModal || mDropDownList.isInTouchMode()) {
                  clearListSelection();
              }
              if (!mModal) {
                  mHandler.post(mHideSelector);
              }
          }
      }
  
      public void dismiss() {
          mPopup.dismiss();
          if (mPromptView != null) {
              final ViewParent parent = mPromptView.getParent();
              if (parent instanceof ViewGroup) {
                  final ViewGroup group = (ViewGroup) parent;
                  group.removeView(mPromptView);
              }
          }
          mPopup.setContentView(null);
          mDropDownList = null;
          mHandler.removeCallbacks(mResizePopupRunnable);
      }
  
      public void setOnDismissListener(PopupWindow.OnDismissListener listener) {
          mPopup.setOnDismissListener(listener);
      }
  
      public void setInputMethodMode(int mode) {
          mPopup.setInputMethodMode(mode);
      }
  
      /**
       * Set the selected position of the list.
       * Only valid when {@link #isShowing()} == {@code true}.
       *
       * @param position List position to set as selected.
       */
      public void setSelection(int position) {
          DropDownListView list = mDropDownList;
          if (isShowing() && list != null) {
              list.mListSelectionHidden = false;
              list.setSelection(position);
              if (list.getChoiceMode() != ListView.CHOICE_MODE_NONE) {
                  list.setItemChecked(position, true);
              }
          }
      }
  
      public void clearListSelection() {
          final DropDownListView list = mDropDownList;
          if (list != null) {
              // WARNING: Please read the comment where mListSelectionHidden is declared
              list.mListSelectionHidden = true;
              //XXX list.hideSelector();
              list.requestLayout();
          }
      }
  
      public boolean isShowing() {
          return mPopup.isShowing();
      }
  
      private boolean isInputMethodNotNeeded() {
          return mPopup.getInputMethodMode() == PopupWindow.INPUT_METHOD_NOT_NEEDED;
      }
  
      public ListView getListView() {
          return mDropDownList;
      }
  
      private int buildDropDown() {
          ViewGroup dropDownView;
          int otherHeights = 0;
  
          if (mDropDownList == null) {
              Context context = mContext;
  
              mDropDownList = new DropDownListView(context, !mModal);
              if (mDropDownListHighlight != null) {
                  mDropDownList.setSelector(mDropDownListHighlight);
              }
              mDropDownList.setAdapter(mAdapter);
              mDropDownList.setOnItemClickListener(mItemClickListener);
              mDropDownList.setFocusable(true);
              mDropDownList.setFocusableInTouchMode(true);
              mDropDownList.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                  public void onItemSelected(AdapterView<?> parent, View view,
                          int position, long id) {
  
                      if (position != -1) {
                          DropDownListView dropDownList = mDropDownList;
  
                          if (dropDownList != null) {
                              dropDownList.mListSelectionHidden = false;
                          }
                      }
                  }
  
                  public void onNothingSelected(AdapterView<?> parent) {
                  }
              });
              mDropDownList.setOnScrollListener(mScrollListener);
  
              if (mItemSelectedListener != null) {
                  mDropDownList.setOnItemSelectedListener(mItemSelectedListener);
              }
  
              dropDownView = mDropDownList;
  
              View hintView = mPromptView;
              if (hintView != null) {
                  // if an hint has been specified, we accomodate more space for it and
                  // add a text view in the drop down menu, at the bottom of the list
                  LinearLayout hintContainer = new LinearLayout(context);
                  hintContainer.setOrientation(LinearLayout.VERTICAL);
  
                  LinearLayout.LayoutParams hintParams = new LinearLayout.LayoutParams(
                          ViewGroup.LayoutParams.MATCH_PARENT, 0, 1.0f
                  );
  
                  switch (mPromptPosition) {
                  case POSITION_PROMPT_BELOW:
                      hintContainer.addView(dropDownView, hintParams);
                      hintContainer.addView(hintView);
                      break;
  
                  case POSITION_PROMPT_ABOVE:
                      hintContainer.addView(hintView);
                      hintContainer.addView(dropDownView, hintParams);
                      break;
  
                  default:
                      break;
                  }
  
                  // measure the hint's height to find how much more vertical space
                  // we need to add to the drop down's height
                  int widthSpec = MeasureSpec.makeMeasureSpec(mDropDownWidth, MeasureSpec.AT_MOST);
                  int heightSpec = MeasureSpec.UNSPECIFIED;
                  hintView.measure(widthSpec, heightSpec);
  
                  hintParams = (LinearLayout.LayoutParams) hintView.getLayoutParams();
                  otherHeights = hintView.getMeasuredHeight() + hintParams.topMargin
                          + hintParams.bottomMargin;
  
                  dropDownView = hintContainer;
              }
  
              mPopup.setContentView(dropDownView);
          } else {
              dropDownView = (ViewGroup) mPopup.getContentView();
              final View view = mPromptView;
              if (view != null) {
                  LinearLayout.LayoutParams hintParams =
                          (LinearLayout.LayoutParams) view.getLayoutParams();
                  otherHeights = view.getMeasuredHeight() + hintParams.topMargin
                          + hintParams.bottomMargin;
              }
          }
  
          // getMaxAvailableHeight() subtracts the padding, so we put it back
          // to get the available height for the whole window
          int padding = 0;
          Drawable background = mPopup.getBackground();
          if (background != null) {
              background.getPadding(mTempRect);
              padding = mTempRect.top + mTempRect.bottom;
  
              // If we don't have an explicit vertical offset, determine one from the window
              // background so that content will line up.
              if (!mDropDownVerticalOffsetSet) {
                  mDropDownVerticalOffset = -mTempRect.top;
              }
          }
  
          // Max height available on the screen for a popup.
          boolean ignoreBottomDecorations =
                  mPopup.getInputMethodMode() == PopupWindow.INPUT_METHOD_NOT_NEEDED;
          final int maxHeight = /*mPopup.*/getMaxAvailableHeight(
                  mDropDownAnchorView, mDropDownVerticalOffset, ignoreBottomDecorations);
  
          if (mDropDownHeight == ViewGroup.LayoutParams.MATCH_PARENT) {
              return maxHeight + padding;
          }
  
          final int listContent = /*mDropDownList.*/measureHeightOfChildren(MeasureSpec.UNSPECIFIED,
                  0, -1/*ListView.NO_POSITION*/, maxHeight - otherHeights, -1);
          // add padding only if the list has items in it, that way we don't show
          // the popup if it is not needed
          if (listContent > 0) otherHeights += padding;
  
          return listContent + otherHeights;
      }
  
      private int getMaxAvailableHeight(View anchor, int yOffset, boolean ignoreBottomDecorations) {
          final Rect displayFrame = new Rect();
          anchor.getWindowVisibleDisplayFrame(displayFrame);
  
          final int[] anchorPos = new int[2];
          anchor.getLocationOnScreen(anchorPos);
  
          int bottomEdge = displayFrame.bottom;
          if (ignoreBottomDecorations) {
              Resources res = anchor.getContext().getResources();
              bottomEdge = res.getDisplayMetrics().heightPixels;
          }
          final int distanceToBottom = bottomEdge - (anchorPos[1] + anchor.getHeight()) - yOffset;
          final int distanceToTop = anchorPos[1] - displayFrame.top + yOffset;
  
          // anchorPos[1] is distance from anchor to top of screen
          int returnedHeight = Math.max(distanceToBottom, distanceToTop);
          if (mPopup.getBackground() != null) {
              mPopup.getBackground().getPadding(mTempRect);
              returnedHeight -= mTempRect.top + mTempRect.bottom;
          }
  
          return returnedHeight;
      }
  
      private int measureHeightOfChildren(int widthMeasureSpec, int startPosition, int endPosition,
              final int maxHeight, int disallowPartialChildPosition) {
  
          final ListAdapter adapter = mAdapter;
          if (adapter == null) {
              return mDropDownList.getListPaddingTop() + mDropDownList.getListPaddingBottom();
          }
  
          // Include the padding of the list
          int returnedHeight = mDropDownList.getListPaddingTop() + mDropDownList.getListPaddingBottom();
          final int dividerHeight = ((mDropDownList.getDividerHeight() > 0) && mDropDownList.getDivider() != null) ? mDropDownList.getDividerHeight() : 0;
          // The previous height value that was less than maxHeight and contained
          // no partial children
          int prevHeightWithoutPartialChild = 0;
          int i;
          View child;
  
          // mItemCount - 1 since endPosition parameter is inclusive
          endPosition = (endPosition == -1/*NO_POSITION*/) ? adapter.getCount() - 1 : endPosition;
  
          for (i = startPosition; i <= endPosition; ++i) {
              child = mAdapter.getView(i, null, mDropDownList);
              if (mDropDownList.getCacheColorHint() != 0) {
                  child.setDrawingCacheBackgroundColor(mDropDownList.getCacheColorHint());
              }
  
              measureScrapChild(child, i, widthMeasureSpec);
  
              if (i > 0) {
                  // Count the divider for all but one child
                  returnedHeight += dividerHeight;
              }
  
              returnedHeight += child.getMeasuredHeight();
  
              if (returnedHeight >= maxHeight) {
                  // We went over, figure out which height to return.  If returnedHeight > maxHeight,
                  // then the i'th position did not fit completely.
                  return (disallowPartialChildPosition >= 0) // Disallowing is enabled (> -1)
                              && (i > disallowPartialChildPosition) // We've past the min pos
                              && (prevHeightWithoutPartialChild > 0) // We have a prev height
                              && (returnedHeight != maxHeight) // i'th child did not fit completely
                          ? prevHeightWithoutPartialChild
                          : maxHeight;
              }
  
              if ((disallowPartialChildPosition >= 0) && (i >= disallowPartialChildPosition)) {
                  prevHeightWithoutPartialChild = returnedHeight;
              }
          }
  
          // At this point, we went through the range of children, and they each
          // completely fit, so return the returnedHeight
          return returnedHeight;
      }
      private void measureScrapChild(View child, int position, int widthMeasureSpec) {
          ListView.LayoutParams p = (ListView.LayoutParams) child.getLayoutParams();
          if (p == null) {
              p = new ListView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                      ViewGroup.LayoutParams.WRAP_CONTENT, 0);
              child.setLayoutParams(p);
          }
          //XXX p.viewType = mAdapter.getItemViewType(position);
          //XXX p.forceAdd = true;
  
          int childWidthSpec = ViewGroup.getChildMeasureSpec(widthMeasureSpec,
                  mDropDownList.getPaddingLeft() + mDropDownList.getPaddingRight(), p.width);
          int lpHeight = p.height;
          int childHeightSpec;
          if (lpHeight > 0) {
              childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight, MeasureSpec.EXACTLY);
          } else {
              childHeightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
          }
          child.measure(childWidthSpec, childHeightSpec);
      }
  
      private static class DropDownListView extends ListView {
          /*
           * WARNING: This is a workaround for a touch mode issue.
           *
           * Touch mode is propagated lazily to windows. This causes problems in
           * the following scenario:
           * - Type something in the AutoCompleteTextView and get some results
           * - Move down with the d-pad to select an item in the list
           * - Move up with the d-pad until the selection disappears
           * - Type more text in the AutoCompleteTextView *using the soft keyboard*
           *   and get new results; you are now in touch mode
           * - The selection comes back on the first item in the list, even though
           *   the list is supposed to be in touch mode
           *
           * Using the soft keyboard triggers the touch mode change but that change
           * is propagated to our window only after the first list layout, therefore
           * after the list attempts to resurrect the selection.
           *
           * The trick to work around this issue is to pretend the list is in touch
           * mode when we know that the selection should not appear, that is when
           * we know the user moved the selection away from the list.
           *
           * This boolean is set to true whenever we explicitly hide the list's
           * selection and reset to false whenever we know the user moved the
           * selection back to the list.
           *
           * When this boolean is true, isInTouchMode() returns true, otherwise it
           * returns super.isInTouchMode().
           */
          private boolean mListSelectionHidden;
  
          private boolean mHijackFocus;
  
          public DropDownListView(Context context, boolean hijackFocus) {
              super(context, null, /*com.android.internal.*/R.attr.dropDownListViewStyle);
              mHijackFocus = hijackFocus;
              // TODO: Add an API to control this
              setCacheColorHint(0); // Transparent, since the background drawable could be anything.
          }
  
          //XXX @Override
          //View obtainView(int position, boolean[] isScrap) {
          //    View view = super.obtainView(position, isScrap);
  
          //    if (view instanceof TextView) {
          //        ((TextView) view).setHorizontallyScrolling(true);
          //    }
  
          //    return view;
          //}
  
          @Override
          public boolean isInTouchMode() {
              // WARNING: Please read the comment where mListSelectionHidden is declared
              return (mHijackFocus && mListSelectionHidden) || super.isInTouchMode();
          }
  
          @Override
          public boolean hasWindowFocus() {
              return mHijackFocus || super.hasWindowFocus();
          }
  
          @Override
          public boolean isFocused() {
              return mHijackFocus || super.isFocused();
          }
  
          @Override
          public boolean hasFocus() {
              return mHijackFocus || super.hasFocus();
          }
      }
  
      private class PopupDataSetObserver extends DataSetObserver {
          @Override
          public void onChanged() {
              if (isShowing()) {
                  // Resize the popup to fit new content
                  show();
              }
          }
  
          @Override
          public void onInvalidated() {
              dismiss();
          }
      }
  
      private class ListSelectorHider implements Runnable {
          public void run() {
              clearListSelection();
          }
      }
  
      private class ResizePopupRunnable implements Runnable {
          public void run() {
              if (mDropDownList != null && mDropDownList.getCount() > mDropDownList.getChildCount() &&
                      mDropDownList.getChildCount() <= mListItemExpandMaximum) {
                  mPopup.setInputMethodMode(PopupWindow.INPUT_METHOD_NOT_NEEDED);
                  show();
              }
          }
      }
  
      private class PopupTouchInterceptor implements OnTouchListener {
          public boolean onTouch(View v, MotionEvent event) {
              final int action = event.getAction();
              final int x = (int) event.getX();
              final int y = (int) event.getY();
  
              if (action == MotionEvent.ACTION_DOWN &&
                      mPopup != null && mPopup.isShowing() &&
                      (x >= 0 && x < mPopup.getWidth() && y >= 0 && y < mPopup.getHeight())) {
                  mHandler.postDelayed(mResizePopupRunnable, EXPAND_LIST_TIMEOUT);
              } else if (action == MotionEvent.ACTION_UP) {
                  mHandler.removeCallbacks(mResizePopupRunnable);
              }
              return false;
          }
      }
  
      private class PopupScrollListener implements ListView.OnScrollListener {
          public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount,
                  int totalItemCount) {
  
          }
  
          public void onScrollStateChanged(AbsListView view, int scrollState) {
              if (scrollState == SCROLL_STATE_TOUCH_SCROLL &&
                      !isInputMethodNotNeeded() && mPopup.getContentView() != null) {
                  mHandler.removeCallbacks(mResizePopupRunnable);
                  mResizePopupRunnable.run();
              }
          }
      }
  }
  