content: /*
   * android-spinnerwheel
   * https://github.com/ai212983/android-spinnerwheel
   *
   * based on
   *
   * Android Wheel Control.
   * https://code.google.com/p/android-wheel/
   *
   * Copyright 2011 Yuri Kanivets
   *
   * 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 antistatic.spinnerwheel;
  
  import android.content.Context;
  import android.content.res.TypedArray;
  import android.graphics.Canvas;
  import android.graphics.LinearGradient;
  import android.graphics.Shader;
  import android.util.AttributeSet;
  import android.util.Log;
  import android.view.MotionEvent;
  import android.view.View;
  import android.view.ViewGroup.LayoutParams;
  import android.widget.LinearLayout;
  
  /**
   * Spinner wheel horizontal view.
   *
   * @author Yuri Kanivets
   * @author Dimitri Fedorov
   */
  public class WheelHorizontalView extends AbstractWheelView {
  
      private static int itemID = -1;
  
      @SuppressWarnings("unused")
      private final String LOG_TAG = WheelVerticalView.class.getName() + " #" + (++itemID);
  
      /**
       * The width of the selection divider.
       */
      protected int mSelectionDividerWidth;
  
      // Item width
      private int itemWidth = 0;
  
      //--------------------------------------------------------------------------
      //
      //  Constructors
      //
      //--------------------------------------------------------------------------
  
      /**
       * Create a new wheel horizontal view.
       *
       * @param context The application environment.
       */
      public WheelHorizontalView(Context context) {
          this(context, null);
      }
  
      /**
       * Create a new wheel horizontal view.
       *
       * @param context The application environment.
       * @param attrs A collection of attributes.
       */
      public WheelHorizontalView(Context context, AttributeSet attrs) {
          this(context, attrs, R.attr.abstractWheelViewStyle);
      }
  
      /**
       * Create a new wheel horizontal view.
       *
       * @param context the application environment.
       * @param attrs a collection of attributes.
       * @param defStyle The default style to apply to this view.
       */
      public WheelHorizontalView(Context context, AttributeSet attrs, int defStyle) {
          super(context, attrs, defStyle);
      }
  
  
      //--------------------------------------------------------------------------
      //
      //  Initiating assets and setter for selector paint
      //
      //--------------------------------------------------------------------------
  
      @Override
      protected void initAttributes(AttributeSet attrs, int defStyle) {
          super.initAttributes(attrs, defStyle);
  
          TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.WheelHorizontalView, defStyle, 0);
          mSelectionDividerWidth = a.getDimensionPixelSize(R.styleable.WheelHorizontalView_selectionDividerWidth, DEF_SELECTION_DIVIDER_SIZE);
          a.recycle();
      }
  
      public void setSelectionDividerWidth(int selectionDividerWidth) {
          this.mSelectionDividerWidth = selectionDividerWidth;
      }
  
      @Override
      public void setSelectorPaintCoeff(float coeff) {
          if (mItemsDimmedAlpha >= 100)
              return;
  
          LinearGradient shader;
  
          int w = getMeasuredWidth();
          int iw = getItemDimension();
          float p1 = (1 - iw/(float) w)/2;
          float p2 = (1 + iw/(float) w)/2;
          float z = mItemsDimmedAlpha * (1 - coeff);
          float c1f = z + 255 * coeff;
  
          if (mVisibleItems == 2) {
              int c1 = Math.round( c1f ) << 24;
              int c2 = Math.round( z ) << 24;
              int[] colors =      {c2, c1, 0xff000000, 0xff000000, c1, c2};
              float[] positions = { 0, p1,     p1,         p2,     p2,  1};
              shader = new LinearGradient(0, 0, w, 0, colors, positions, Shader.TileMode.CLAMP);
          } else {
              float p3 = (1 - iw*3/(float) w)/2;
              float p4 = (1 + iw*3/(float) w)/2;
  
              float s = 255 * p3/p1;
              float c3f = s * coeff ; // here goes some optimized stuff
              float c2f = z + c3f;
  
              int c1 = Math.round( c1f ) << 24;
              int c2 = Math.round( c2f ) << 24;
              int c3 = Math.round( c3f ) << 24;
  
              int[] colors = { c2, c2, c2, c2, 0xff000000, 0xff000000, c2, c2, c2, c2 };
              float[] positions = { 0, p3, p3, p1, p1, p2, p2, p4, p4, 1 };
              shader = new LinearGradient(0, 0, w, 0, colors, positions, Shader.TileMode.CLAMP);
          }
          mSelectorWheelPaint.setShader(shader);
          invalidate();
      }
  
  
      //--------------------------------------------------------------------------
      //
      //  Scroller-specific methods
      //
      //--------------------------------------------------------------------------
  
      @Override
      protected WheelScroller createScroller(WheelScroller.ScrollingListener scrollingListener) {
          return new WheelHorizontalScroller(getContext(), scrollingListener);
      }
  
      @Override
      protected float getMotionEventPosition(MotionEvent event) {
          return event.getX();
      }
  
  
      //--------------------------------------------------------------------------
      //
      //  Base measurements
      //
      //--------------------------------------------------------------------------
  
      @Override
      protected int getBaseDimension() {
          return getWidth();
      }
  
      /**
       * Returns height of spinnerwheel item
       * @return the item width
       */
      @Override
      protected int getItemDimension() {
          if (itemWidth != 0) {
              return itemWidth;
          }
  
          if (mItemsLayout != null && mItemsLayout.getChildAt(0) != null) {
              itemWidth = mItemsLayout.getChildAt(0).getMeasuredWidth();
              return itemWidth;
          }
  
          return getBaseDimension() / mVisibleItems;
      }
  
      //--------------------------------------------------------------------------
      //
      //  Debugging stuff
      //
      //--------------------------------------------------------------------------
  
  
      @Override
      protected void onScrollTouchedUp() {
          super.onScrollTouchedUp();
          int cnt = mItemsLayout.getChildCount();
          View itm;
          Log.e(LOG_TAG, " ----- layout: " + mItemsLayout.getMeasuredWidth() + mItemsLayout.getMeasuredHeight());
          Log.e(LOG_TAG, " -------- dumping " + cnt + " items");
          for (int i = 0; i < cnt; i++) {
              itm = mItemsLayout.getChildAt(i);
              Log.e(LOG_TAG, " item #" + i + ": " + itm.getWidth() + "x" + itm.getHeight());
              itm.forceLayout(); // forcing layout without re-rendering parent
          }
          Log.e(LOG_TAG, " ---------- dumping finished ");
      }
  
  
      //--------------------------------------------------------------------------
      //
      //  Layout creation and measurement operations
      //
      //--------------------------------------------------------------------------
  
      /**
       * Creates item layouts if necessary
       */
      @Override
      protected void createItemsLayout() {
          if (mItemsLayout == null) {
              mItemsLayout = new LinearLayout(getContext());
              mItemsLayout.setOrientation(LinearLayout.HORIZONTAL);
          }
      }
  
      @Override
      protected void doItemsLayout() {
          mItemsLayout.layout(0, 0, getMeasuredWidth(), getMeasuredHeight() - 2 * mItemsPadding);
      }
  
      @Override
      protected void measureLayout() {
          mItemsLayout.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
          // XXX: Locating bug
          mItemsLayout.measure(
                  MeasureSpec.makeMeasureSpec(getWidth() + getItemDimension(), MeasureSpec.UNSPECIFIED),
                  MeasureSpec.makeMeasureSpec(getHeight(), MeasureSpec.AT_MOST));
      }
  
      //XXX: Most likely, measurements of mItemsLayout or/and its children are done inconrrectly.
      // Investigate and fix it
  
      @Override
      protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
          int widthMode = MeasureSpec.getMode(widthMeasureSpec);
          int heightMode = MeasureSpec.getMode(heightMeasureSpec);
          int widthSize = MeasureSpec.getSize(widthMeasureSpec);
          int heightSize = MeasureSpec.getSize(heightMeasureSpec);
  
          rebuildItems(); // rebuilding before measuring
  
          int height = calculateLayoutHeight(heightSize, heightMode);
  
          int width;
          if (widthMode == MeasureSpec.EXACTLY) {
              width = widthSize;
          } else {
              width = Math.max(
                      getItemDimension() * (mVisibleItems - mItemOffsetPercent / 100),
                      getSuggestedMinimumWidth()
              );
  
              if (widthMode == MeasureSpec.AT_MOST) {
                  width = Math.min(width, widthSize);
              }
          }
          setMeasuredDimension(width, height);
      }
  
  
      /**
       * Calculates control height and creates text layouts
       * @param heightSize the input layout height
       * @param mode the layout mode
       * @return the calculated control height
       */
      private int calculateLayoutHeight(int heightSize, int mode) {
          mItemsLayout.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
          mItemsLayout.measure(
                  MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
                  MeasureSpec.makeMeasureSpec(heightSize, MeasureSpec.UNSPECIFIED)
                  );
          int height = mItemsLayout.getMeasuredHeight();
  
          if (mode == MeasureSpec.EXACTLY) {
              height = heightSize;
          } else {
              height += 2 * mItemsPadding;
  
              // Check against our minimum width
              height = Math.max(height, getSuggestedMinimumHeight());
  
              if (mode == MeasureSpec.AT_MOST && heightSize < height) {
                  height = heightSize;
              }
          }
          // forcing recalculating
          mItemsLayout.measure(
                  // MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
                  MeasureSpec.makeMeasureSpec(400, MeasureSpec.EXACTLY),
                  MeasureSpec.makeMeasureSpec(height - 2 * mItemsPadding, MeasureSpec.EXACTLY)
          );
  
          return height;
      }
  
  
      //--------------------------------------------------------------------------
      //
      //  Drawing items
      //
      //--------------------------------------------------------------------------
  
      @Override
      protected void drawItems(Canvas canvas) {
          canvas.save();
          int w = getMeasuredWidth();
          int h = getMeasuredHeight();
          int iw = getItemDimension();
  
          // resetting intermediate bitmap and recreating canvases
          mSpinBitmap.eraseColor(0);
          Canvas c = new Canvas(mSpinBitmap);
          Canvas cSpin = new Canvas(mSpinBitmap);
  
          int left = (mCurrentItemIdx - mFirstItemIdx) * iw + (iw - getWidth()) / 2;
          c.translate(- left + mScrollingOffset, mItemsPadding);
          mItemsLayout.draw(c);
  
          mSeparatorsBitmap.eraseColor(0);
          Canvas cSeparators = new Canvas(mSeparatorsBitmap);
  
          if (mSelectionDivider != null) {
              // draw the top divider
              int leftOfLeftDivider = (getWidth() - iw - mSelectionDividerWidth) / 2;
              int rightOfLeftDivider = leftOfLeftDivider + mSelectionDividerWidth;
              cSeparators.save();
              // On Gingerbread setBounds() is ignored resulting in an ugly visual bug.
              cSeparators.clipRect(leftOfLeftDivider, 0, rightOfLeftDivider, h);
              mSelectionDivider.setBounds(leftOfLeftDivider, 0, rightOfLeftDivider, h);
              mSelectionDivider.draw(cSeparators);
              cSeparators.restore();
  
              cSeparators.save();
              // draw the bottom divider
              int leftOfRightDivider =  leftOfLeftDivider + iw;
              int rightOfRightDivider = rightOfLeftDivider + iw;
              // On Gingerbread setBounds() is ignored resulting in an ugly visual bug.
              cSeparators.clipRect(leftOfRightDivider, 0, rightOfRightDivider, h);
              mSelectionDivider.setBounds(leftOfRightDivider, 0, rightOfRightDivider, h);
              mSelectionDivider.draw(cSeparators);
              cSeparators.restore();
          }
  
          cSpin.drawRect(0, 0, w, h, mSelectorWheelPaint);
          cSeparators.drawRect(0, 0, w, h, mSeparatorsPaint);
  
          canvas.drawBitmap(mSpinBitmap, 0, 0, null);
          canvas.drawBitmap(mSeparatorsBitmap, 0, 0, null);
          canvas.restore();
      }
  
  }
  