content: /*
   * Copyright (C) 2007 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 com.actionbarsherlock.internal.widget;
  
  import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
  import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;
  import com.actionbarsherlock.R;
  import android.content.Context;
  import android.content.DialogInterface;
  import android.content.DialogInterface.OnClickListener;
  import android.content.res.TypedArray;
  import android.database.DataSetObserver;
  import android.graphics.Rect;
  import android.graphics.drawable.Drawable;
  import android.util.AttributeSet;
  import android.view.Gravity;
  import android.view.View;
  import android.view.ViewGroup;
  import android.widget.AdapterView;
  import android.widget.AdapterView.OnItemClickListener;
  import android.widget.ListAdapter;
  import android.widget.ListView;
  import android.widget.PopupWindow;
  import android.widget.SpinnerAdapter;
  
  
  /**
   * A view that displays one child at a time and lets the user pick among them.
   * The items in the Spinner come from the {@link Adapter} associated with
   * this view.
   *
   * <p>See the <a href="{@docRoot}resources/tutorials/views/hello-spinner.html">Spinner
   * tutorial</a>.</p>
   *
   * @attr ref android.R.styleable#Spinner_prompt
   */
  public class IcsSpinner extends IcsAbsSpinner implements OnClickListener {
      //private static final String TAG = "Spinner";
  
      // Only measure this many items to get a decent max width.
      private static final int MAX_ITEMS_MEASURED = 15;
  
      /**
       * Use a dialog window for selecting spinner options.
       */
      //public static final int MODE_DIALOG = 0;
  
      /**
       * Use a dropdown anchored to the Spinner for selecting spinner options.
       */
      public static final int MODE_DROPDOWN = 1;
  
      /**
       * Use the theme-supplied value to select the dropdown mode.
       */
      //private static final int MODE_THEME = -1;
  
      private SpinnerPopup mPopup;
      private DropDownAdapter mTempAdapter;
      int mDropDownWidth;
  
      private int mGravity;
      private boolean mDisableChildrenWhenDisabled;
  
      private Rect mTempRect = new Rect();
  
      public IcsSpinner(Context context, AttributeSet attrs) {
          this(context, attrs, R.attr.actionDropDownStyle);
      }
  
      /**
       * Construct a new spinner with the given context's theme, the supplied attribute set,
       * and default style.
       *
       * @param context The Context the view is running in, through which it can
       *        access the current theme, resources, etc.
       * @param attrs The attributes of the XML tag that is inflating the view.
       * @param defStyle The default style to apply to this view. If 0, no style
       *        will be applied (beyond what is included in the theme). This may
       *        either be an attribute resource, whose value will be retrieved
       *        from the current theme, or an explicit style resource.
       */
      public IcsSpinner(Context context, AttributeSet attrs, int defStyle) {
          super(context, attrs, defStyle);
  
          TypedArray a = context.obtainStyledAttributes(attrs,
                  R.styleable.SherlockSpinner, defStyle, 0);
  
  
          DropdownPopup popup = new DropdownPopup(context, attrs, defStyle);
  
          mDropDownWidth = a.getLayoutDimension(
                  R.styleable.SherlockSpinner_android_dropDownWidth,
                  ViewGroup.LayoutParams.WRAP_CONTENT);
          popup.setBackgroundDrawable(a.getDrawable(
                  R.styleable.SherlockSpinner_android_popupBackground));
          final int verticalOffset = a.getDimensionPixelOffset(
                  R.styleable.SherlockSpinner_android_dropDownVerticalOffset, 0);
          if (verticalOffset != 0) {
              popup.setVerticalOffset(verticalOffset);
          }
  
          final int horizontalOffset = a.getDimensionPixelOffset(
                  R.styleable.SherlockSpinner_android_dropDownHorizontalOffset, 0);
          if (horizontalOffset != 0) {
              popup.setHorizontalOffset(horizontalOffset);
          }
  
          mPopup = popup;
  
          mGravity = a.getInt(R.styleable.SherlockSpinner_android_gravity, Gravity.CENTER);
  
          mPopup.setPromptText(a.getString(R.styleable.SherlockSpinner_android_prompt));
  
          mDisableChildrenWhenDisabled = true;
  
          a.recycle();
  
          // Base constructor can call setAdapter before we initialize mPopup.
          // Finish setting things up if this happened.
          if (mTempAdapter != null) {
              mPopup.setAdapter(mTempAdapter);
              mTempAdapter = null;
          }
      }
  
      @Override
      public void setEnabled(boolean enabled) {
          super.setEnabled(enabled);
          if (mDisableChildrenWhenDisabled) {
              final int count = getChildCount();
              for (int i = 0; i < count; i++) {
                  getChildAt(i).setEnabled(enabled);
              }
          }
      }
  
      /**
       * Describes how the selected item view is positioned. Currently only the horizontal component
       * is used. The default is determined by the current theme.
       *
       * @param gravity See {@link android.view.Gravity}
       *
       * @attr ref android.R.styleable#Spinner_gravity
       */
      public void setGravity(int gravity) {
          if (mGravity != gravity) {
              if ((gravity & Gravity.HORIZONTAL_GRAVITY_MASK) == 0) {
                  gravity |= Gravity.LEFT;
              }
              mGravity = gravity;
              requestLayout();
          }
      }
  
      @Override
      public void setAdapter(SpinnerAdapter adapter) {
          super.setAdapter(adapter);
  
          if (mPopup != null) {
              mPopup.setAdapter(new DropDownAdapter(adapter));
          } else {
              mTempAdapter = new DropDownAdapter(adapter);
          }
      }
  
      @Override
      public int getBaseline() {
          View child = null;
  
          if (getChildCount() > 0) {
              child = getChildAt(0);
          } else if (mAdapter != null && mAdapter.getCount() > 0) {
              child = makeAndAddView(0);
              mRecycler.put(0, child);
              removeAllViewsInLayout();
          }
  
          if (child != null) {
              final int childBaseline = child.getBaseline();
              return childBaseline >= 0 ? child.getTop() + childBaseline : -1;
          } else {
              return -1;
          }
      }
  
      @Override
      protected void onDetachedFromWindow() {
          super.onDetachedFromWindow();
  
          if (mPopup != null && mPopup.isShowing()) {
              mPopup.dismiss();
          }
      }
  
      /**
       * <p>A spinner does not support item click events. Calling this method
       * will raise an exception.</p>
       *
       * @param l this listener will be ignored
       */
      @Override
      public void setOnItemClickListener(OnItemClickListener l) {
          throw new RuntimeException("setOnItemClickListener cannot be used with a spinner.");
      }
  
      @Override
      protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
          super.onMeasure(widthMeasureSpec, heightMeasureSpec);
          if (mPopup != null && MeasureSpec.getMode(widthMeasureSpec) == MeasureSpec.AT_MOST) {
              final int measuredWidth = getMeasuredWidth();
              setMeasuredDimension(Math.min(Math.max(measuredWidth,
                      measureContentWidth(getAdapter(), getBackground())),
                      MeasureSpec.getSize(widthMeasureSpec)),
                      getMeasuredHeight());
          }
      }
  
      /**
       * @see android.view.View#onLayout(boolean,int,int,int,int)
       *
       * Creates and positions all views
       *
       */
      @Override
      protected void onLayout(boolean changed, int l, int t, int r, int b) {
          super.onLayout(changed, l, t, r, b);
          mInLayout = true;
          layout(0, false);
          mInLayout = false;
      }
  
      /**
       * Creates and positions all views for this Spinner.
       *
       * @param delta Change in the selected position. +1 moves selection is moving to the right,
       * so views are scrolling to the left. -1 means selection is moving to the left.
       */
      @Override
      void layout(int delta, boolean animate) {
          int childrenLeft = mSpinnerPadding.left;
          int childrenWidth = getRight() - getLeft() - mSpinnerPadding.left - mSpinnerPadding.right;
  
          if (mDataChanged) {
              handleDataChanged();
          }
  
          // Handle the empty set by removing all views
          if (mItemCount == 0) {
              resetList();
              return;
          }
  
          if (mNextSelectedPosition >= 0) {
              setSelectedPositionInt(mNextSelectedPosition);
          }
  
          recycleAllViews();
  
          // Clear out old views
          removeAllViewsInLayout();
  
          // Make selected view and position it
          mFirstPosition = mSelectedPosition;
          View sel = makeAndAddView(mSelectedPosition);
          int width = sel.getMeasuredWidth();
          int selectedOffset = childrenLeft;
          switch (mGravity & Gravity.HORIZONTAL_GRAVITY_MASK) {
              case Gravity.CENTER_HORIZONTAL:
                  selectedOffset = childrenLeft + (childrenWidth / 2) - (width / 2);
                  break;
              case Gravity.RIGHT:
                  selectedOffset = childrenLeft + childrenWidth - width;
                  break;
          }
          sel.offsetLeftAndRight(selectedOffset);
  
          // Flush any cached views that did not get reused above
          mRecycler.clear();
  
          invalidate();
  
          checkSelectionChanged();
  
          mDataChanged = false;
          mNeedSync = false;
          setNextSelectedPositionInt(mSelectedPosition);
      }
  
      /**
       * Obtain a view, either by pulling an existing view from the recycler or
       * by getting a new one from the adapter. If we are animating, make sure
       * there is enough information in the view's layout parameters to animate
       * from the old to new positions.
       *
       * @param position Position in the spinner for the view to obtain
       * @return A view that has been added to the spinner
       */
      private View makeAndAddView(int position) {
  
          View child;
  
          if (!mDataChanged) {
              child = mRecycler.get(position);
              if (child != null) {
                  // Position the view
                  setUpChild(child);
  
                  return child;
              }
          }
  
          // Nothing found in the recycler -- ask the adapter for a view
          child = mAdapter.getView(position, null, this);
  
          // Position the view
          setUpChild(child);
  
          return child;
      }
  
      /**
       * Helper for makeAndAddView to set the position of a view
       * and fill out its layout paramters.
       *
       * @param child The view to position
       */
      private void setUpChild(View child) {
  
          // Respect layout params that are already in the view. Otherwise
          // make some up...
          ViewGroup.LayoutParams lp = child.getLayoutParams();
          if (lp == null) {
              lp = generateDefaultLayoutParams();
          }
  
          addViewInLayout(child, 0, lp);
  
          child.setSelected(hasFocus());
          if (mDisableChildrenWhenDisabled) {
              child.setEnabled(isEnabled());
          }
  
          // Get measure specs
          int childHeightSpec = ViewGroup.getChildMeasureSpec(mHeightMeasureSpec,
                  mSpinnerPadding.top + mSpinnerPadding.bottom, lp.height);
          int childWidthSpec = ViewGroup.getChildMeasureSpec(mWidthMeasureSpec,
                  mSpinnerPadding.left + mSpinnerPadding.right, lp.width);
  
          // Measure child
          child.measure(childWidthSpec, childHeightSpec);
  
          int childLeft;
          int childRight;
  
          // Position vertically based on gravity setting
          int childTop = mSpinnerPadding.top
                  + ((getMeasuredHeight() - mSpinnerPadding.bottom -
                          mSpinnerPadding.top - child.getMeasuredHeight()) / 2);
          int childBottom = childTop + child.getMeasuredHeight();
  
          int width = child.getMeasuredWidth();
          childLeft = 0;
          childRight = childLeft + width;
  
          child.layout(childLeft, childTop, childRight, childBottom);
      }
  
      @Override
      public boolean performClick() {
          boolean handled = super.performClick();
  
          if (!handled) {
              handled = true;
  
              if (!mPopup.isShowing()) {
                  mPopup.show();
              }
          }
  
          return handled;
      }
  
      public void onClick(DialogInterface dialog, int which) {
          setSelection(which);
          dialog.dismiss();
      }
  
      /**
       * Sets the prompt to display when the dialog is shown.
       * @param prompt the prompt to set
       */
      public void setPrompt(CharSequence prompt) {
          mPopup.setPromptText(prompt);
      }
  
      /**
       * Sets the prompt to display when the dialog is shown.
       * @param promptId the resource ID of the prompt to display when the dialog is shown
       */
      public void setPromptId(int promptId) {
          setPrompt(getContext().getText(promptId));
      }
  
      /**
       * @return The prompt to display when the dialog is shown
       */
      public CharSequence getPrompt() {
          return mPopup.getHintText();
      }
  
      int measureContentWidth(SpinnerAdapter adapter, Drawable background) {
          if (adapter == null) {
              return 0;
          }
  
          int width = 0;
          View itemView = null;
          int itemType = 0;
          final int widthMeasureSpec =
              MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
          final int heightMeasureSpec =
              MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
  
          // Make sure the number of items we'll measure is capped. If it's a huge data set
          // with wildly varying sizes, oh well.
          int start = Math.max(0, getSelectedItemPosition());
          final int end = Math.min(adapter.getCount(), start + MAX_ITEMS_MEASURED);
          final int count = end - start;
          start = Math.max(0, start - (MAX_ITEMS_MEASURED - count));
          for (int i = start; i < end; i++) {
              final int positionType = adapter.getItemViewType(i);
              if (positionType != itemType) {
                  itemType = positionType;
                  itemView = null;
              }
              itemView = adapter.getView(i, itemView, this);
              if (itemView.getLayoutParams() == null) {
                  itemView.setLayoutParams(new ViewGroup.LayoutParams(
                          ViewGroup.LayoutParams.WRAP_CONTENT,
                          ViewGroup.LayoutParams.WRAP_CONTENT));
              }
              itemView.measure(widthMeasureSpec, heightMeasureSpec);
              width = Math.max(width, itemView.getMeasuredWidth());
          }
  
          // Add background padding to measured width
          if (background != null) {
              background.getPadding(mTempRect);
              width += mTempRect.left + mTempRect.right;
          }
  
          return width;
      }
  
      /**
       * <p>Wrapper class for an Adapter. Transforms the embedded Adapter instance
       * into a ListAdapter.</p>
       */
      private static class DropDownAdapter implements ListAdapter, SpinnerAdapter {
          private SpinnerAdapter mAdapter;
          private ListAdapter mListAdapter;
  
          /**
           * <p>Creates a new ListAdapter wrapper for the specified adapter.</p>
           *
           * @param adapter the Adapter to transform into a ListAdapter
           */
          public DropDownAdapter(SpinnerAdapter adapter) {
              this.mAdapter = adapter;
              if (adapter instanceof ListAdapter) {
                  this.mListAdapter = (ListAdapter) adapter;
              }
          }
  
          public int getCount() {
              return mAdapter == null ? 0 : mAdapter.getCount();
          }
  
          public Object getItem(int position) {
              return mAdapter == null ? null : mAdapter.getItem(position);
          }
  
          public long getItemId(int position) {
              return mAdapter == null ? -1 : mAdapter.getItemId(position);
          }
  
          public View getView(int position, View convertView, ViewGroup parent) {
              return getDropDownView(position, convertView, parent);
          }
  
          public View getDropDownView(int position, View convertView, ViewGroup parent) {
              return mAdapter == null ? null :
                      mAdapter.getDropDownView(position, convertView, parent);
          }
  
          public boolean hasStableIds() {
              return mAdapter != null && mAdapter.hasStableIds();
          }
  
          public void registerDataSetObserver(DataSetObserver observer) {
              if (mAdapter != null) {
                  mAdapter.registerDataSetObserver(observer);
              }
          }
  
          public void unregisterDataSetObserver(DataSetObserver observer) {
              if (mAdapter != null) {
                  mAdapter.unregisterDataSetObserver(observer);
              }
          }
  
          /**
           * If the wrapped SpinnerAdapter is also a ListAdapter, delegate this call.
           * Otherwise, return true.
           */
          public boolean areAllItemsEnabled() {
              final ListAdapter adapter = mListAdapter;
              if (adapter != null) {
                  return adapter.areAllItemsEnabled();
              } else {
                  return true;
              }
          }
  
          /**
           * If the wrapped SpinnerAdapter is also a ListAdapter, delegate this call.
           * Otherwise, return true.
           */
          public boolean isEnabled(int position) {
              final ListAdapter adapter = mListAdapter;
              if (adapter != null) {
                  return adapter.isEnabled(position);
              } else {
                  return true;
              }
          }
  
          public int getItemViewType(int position) {
              return 0;
          }
  
          public int getViewTypeCount() {
              return 1;
          }
  
          public boolean isEmpty() {
              return getCount() == 0;
          }
      }
  
      /**
       * Implements some sort of popup selection interface for selecting a spinner option.
       * Allows for different spinner modes.
       */
      private interface SpinnerPopup {
          public void setAdapter(ListAdapter adapter);
  
          /**
           * Show the popup
           */
          public void show();
  
          /**
           * Dismiss the popup
           */
          public void dismiss();
  
          /**
           * @return true if the popup is showing, false otherwise.
           */
          public boolean isShowing();
  
          /**
           * Set hint text to be displayed to the user. This should provide
           * a description of the choice being made.
           * @param hintText Hint text to set.
           */
          public void setPromptText(CharSequence hintText);
          public CharSequence getHintText();
      }
  
      /*
      private class DialogPopup implements SpinnerPopup, DialogInterface.OnClickListener {
          private AlertDialog mPopup;
          private ListAdapter mListAdapter;
          private CharSequence mPrompt;
  
          public void dismiss() {
              mPopup.dismiss();
              mPopup = null;
          }
  
          public boolean isShowing() {
              return mPopup != null ? mPopup.isShowing() : false;
          }
  
          public void setAdapter(ListAdapter adapter) {
              mListAdapter = adapter;
          }
  
          public void setPromptText(CharSequence hintText) {
              mPrompt = hintText;
          }
  
          public CharSequence getHintText() {
              return mPrompt;
          }
  
          public void show() {
              AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
              if (mPrompt != null) {
                  builder.setTitle(mPrompt);
              }
              mPopup = builder.setSingleChoiceItems(mListAdapter,
                      getSelectedItemPosition(), this).show();
          }
  
          public void onClick(DialogInterface dialog, int which) {
              setSelection(which);
              dismiss();
          }
      }
      */
  
      private class DropdownPopup extends IcsListPopupWindow implements SpinnerPopup {
          private CharSequence mHintText;
          private ListAdapter mAdapter;
  
          public DropdownPopup(Context context, AttributeSet attrs, int defStyleRes) {
              super(context, attrs, 0, defStyleRes);
  
              setAnchorView(IcsSpinner.this);
              setModal(true);
              setPromptPosition(POSITION_PROMPT_ABOVE);
              setOnItemClickListener(new OnItemClickListener() {
                  @SuppressWarnings("rawtypes")
                  public void onItemClick(AdapterView parent, View v, int position, long id) {
                      IcsSpinner.this.setSelection(position);
                      dismiss();
                  }
              });
          }
  
          @Override
          public void setAdapter(ListAdapter adapter) {
              super.setAdapter(adapter);
              mAdapter = adapter;
          }
  
          public CharSequence getHintText() {
              return mHintText;
          }
  
          public void setPromptText(CharSequence hintText) {
              // Hint text is ignored for dropdowns, but maintain it here.
              mHintText = hintText;
          }
  
          @Override
          public void show() {
              final int spinnerPaddingLeft = IcsSpinner.this.getPaddingLeft();
              if (mDropDownWidth == WRAP_CONTENT) {
                  final int spinnerWidth = IcsSpinner.this.getWidth();
                  final int spinnerPaddingRight = IcsSpinner.this.getPaddingRight();
                  setContentWidth(Math.max(
                          measureContentWidth((SpinnerAdapter) mAdapter, getBackground()),
                          spinnerWidth - spinnerPaddingLeft - spinnerPaddingRight));
              } else if (mDropDownWidth == MATCH_PARENT) {
                  final int spinnerWidth = IcsSpinner.this.getWidth();
                  final int spinnerPaddingRight = IcsSpinner.this.getPaddingRight();
                  setContentWidth(spinnerWidth - spinnerPaddingLeft - spinnerPaddingRight);
              } else {
                  setContentWidth(mDropDownWidth);
              }
              final Drawable background = getBackground();
              int bgOffset = 0;
              if (background != null) {
                  background.getPadding(mTempRect);
                  bgOffset = -mTempRect.left;
              }
              setHorizontalOffset(bgOffset + spinnerPaddingLeft);
              setInputMethodMode(PopupWindow.INPUT_METHOD_NOT_NEEDED);
              super.show();
              getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
              setSelection(IcsSpinner.this.getSelectedItemPosition());
          }
      }
  }
  