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.*;
  import android.util.AttributeSet;
  import android.view.MotionEvent;
  import android.view.ViewGroup.LayoutParams;
  import android.widget.LinearLayout;
  
  /**
   * Spinner wheel vertical view.
   *
   * @author Yuri Kanivets
   * @author Dimitri Fedorov
   */
  public class WheelVerticalView extends AbstractWheelView {
  
      private static int itemID = -1;
  
      @SuppressWarnings("unused")
      private final String LOG_TAG = WheelVerticalView.class.getName() + " #" + (++itemID);
  
      /**
       * The height of the selection divider.
       */
      protected int mSelectionDividerHeight;
  
      // Cached item height
      private int mItemHeight = 0;
      public Canvas mC;
      public Canvas mCSpin;
      public Canvas mCSeparators;
  
      //--------------------------------------------------------------------------
      //
      //  Constructors
      //
      //--------------------------------------------------------------------------
  
      /**
       * Create a new wheel vertical view.
       *
       * @param context The application environment.
       */
      public WheelVerticalView(Context context) {
          this(context, null);
      }
  
      /**
       * Create a new wheel vertical view.
       *
       * @param context The application environment.
       * @param attrs A collection of attributes.
       */
      public WheelVerticalView(Context context, AttributeSet attrs) {
          this(context, attrs, R.attr.abstractWheelViewStyle);
      }
  
      /**
       * Create a new wheel vertical view.
       *
       * @param context the application environment.
       * @param attrs a collection of attributes.
       * @param defStyle The default style to apply to this view.
       */
      public WheelVerticalView(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.WheelVerticalView, defStyle, 0);
          mSelectionDividerHeight = a.getDimensionPixelSize(R.styleable.WheelVerticalView_selectionDividerHeight, DEF_SELECTION_DIVIDER_SIZE);
          a.recycle();
      }
  
      @Override protected void recreateAssets(int width, int height) {
          super.recreateAssets(width, height);
          mC = new Canvas(mSpinBitmap);
          mCSpin = new Canvas(mSpinBitmap);
          mCSeparators = new Canvas(mSeparatorsBitmap);
      }
  
      @Override
      public void setSelectorPaintCoeff(float coeff) {
          LinearGradient shader;
  
          int h = getMeasuredHeight();
          int ih = getItemDimension();
          float p1 = (1 - ih/(float) h)/2;
          float p2 = (1 + ih/(float) h)/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, 0, h, colors, positions, Shader.TileMode.CLAMP);
          } else {
              float p3 = (1 - ih*3/(float) h)/2;
              float p4 = (1 + ih*3/(float) h)/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 =      {0, c3, c2, c1, 0xff000000, 0xff000000, c1, c2, c3, 0};
              float[] positions = {0, p3, p3, p1,     p1,         p2,     p2, p4, p4, 1};
              shader = new LinearGradient(0, 0, 0, h, colors, positions, Shader.TileMode.CLAMP);
          }
          mSelectorWheelPaint.setShader(shader);
          invalidate();
      }
  
  
      //--------------------------------------------------------------------------
      //
      //  Scroller-specific methods
      //
      //--------------------------------------------------------------------------
  
      @Override
      protected WheelScroller createScroller(WheelScroller.ScrollingListener scrollingListener) {
          return new WheelVerticalScroller(getContext(), scrollingListener);
      }
  
      @Override
      protected float getMotionEventPosition(MotionEvent event) {
          return event.getY();
      }
  
      //--------------------------------------------------------------------------
      //
      //  Base measurements
      //
      //--------------------------------------------------------------------------
  
      @Override
      protected int getBaseDimension() {
          return getHeight();
      }
  
      /**
       * Returns height of the spinnerwheel
       * @return the item height
       */
      @Override
      protected int getItemDimension() {
          if (mItemHeight != 0) {
              return mItemHeight;
          }
  
          if (mItemsLayout != null && mItemsLayout.getChildAt(0) != null) {
              mItemHeight = mItemsLayout.getChildAt(0).getMeasuredHeight();
              return mItemHeight;
          }
  
          return getBaseDimension() / mVisibleItems;
      }
  
      //--------------------------------------------------------------------------
      //
      //  Layout creation and measurement operations
      //
      //--------------------------------------------------------------------------
  
      /**
       * Creates item layout if necessary
       */
      @Override
      protected void createItemsLayout() {
          if (mItemsLayout == null) {
              mItemsLayout = new LinearLayout(getContext());
              mItemsLayout.setOrientation(LinearLayout.VERTICAL);
          }
      }
  
      @Override
      protected void doItemsLayout() {
          mItemsLayout.layout(0, 0, getMeasuredWidth() - 2 * mItemsPadding, getMeasuredHeight());
      }
  
  
      @Override
      protected void measureLayout() {
          mItemsLayout.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
  
          mItemsLayout.measure(
                  MeasureSpec.makeMeasureSpec(getWidth() - 2 * mItemsPadding, MeasureSpec.EXACTLY),
                  MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED)
          );
          
      }
  
  
      @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 width = calculateLayoutWidth(widthSize, widthMode);
  
          int height;
          if (heightMode == MeasureSpec.EXACTLY) {
              height = heightSize;
          } else {
              height = Math.max(
                      getItemDimension() * (mVisibleItems - mItemOffsetPercent / 100),
                      getSuggestedMinimumHeight()
              );
  
              if (heightMode == MeasureSpec.AT_MOST) {
                  height = Math.min(height, heightSize);
              }
          }
          setMeasuredDimension(width, height);
      }
  
      /**
       * Calculates control width
       * @param widthSize the input layout width
       * @param mode the layout mode
       * @return the calculated control width
       */
      private int calculateLayoutWidth(int widthSize, int mode) {
          mItemsLayout.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
          mItemsLayout.measure(
                  MeasureSpec.makeMeasureSpec(widthSize, MeasureSpec.UNSPECIFIED),
                  MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED)
          );
          int width = mItemsLayout.getMeasuredWidth();
  
          if (mode == MeasureSpec.EXACTLY) {
              width = widthSize;
          } else {
              width += 2 * mItemsPadding;
  
              // Check against our minimum width
              width = Math.max(width, getSuggestedMinimumWidth());
  
              if (mode == MeasureSpec.AT_MOST && widthSize > width) {
                  width = widthSize;
              }
          }
  
          // forcing recalculating
          mItemsLayout.measure(
                  MeasureSpec.makeMeasureSpec(width - 2 * mItemsPadding, MeasureSpec.EXACTLY),
                  MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED)
          );
  
          return width;
      }
  
  
      //--------------------------------------------------------------------------
      //
      //  Drawing items
      //
      //--------------------------------------------------------------------------
  
      @Override
      protected void drawItems(Canvas canvas) {
          canvas.save();
          int w = getMeasuredWidth();
          int h = getMeasuredHeight();
          int ih = getItemDimension();
  
          // resetting intermediate bitmap and recreating canvases
          mSpinBitmap.eraseColor(0);
          mC.save();
          mCSpin.save();
  
          int top = (mCurrentItemIdx - mFirstItemIdx) * ih + (ih - getHeight()) / 2;
          mC.translate(mItemsPadding, - top + mScrollingOffset);
          mItemsLayout.draw(mC);
  
          mSeparatorsBitmap.eraseColor(0);
  
          if (mSelectionDivider != null) {
              // draw the top divider
              int topOfTopDivider = (getHeight() - ih - mSelectionDividerHeight) / 2;
              int bottomOfTopDivider = topOfTopDivider + mSelectionDividerHeight;
              mSelectionDivider.setBounds(0, topOfTopDivider, w, bottomOfTopDivider);
              mSelectionDivider.draw(mCSeparators);
  
              // draw the bottom divider
              int topOfBottomDivider =  topOfTopDivider + ih;
              int bottomOfBottomDivider = bottomOfTopDivider + ih;
              mSelectionDivider.setBounds(0, topOfBottomDivider, w, bottomOfBottomDivider);
              mSelectionDivider.draw(mCSeparators);
          }
  
          mCSpin.drawRect(0, 0, w, h, mSelectorWheelPaint);
          mCSeparators.drawRect(0, 0, w, h, mSeparatorsPaint);
  
          canvas.drawBitmap(mSpinBitmap, 0, 0, null);
          canvas.drawBitmap(mSeparatorsBitmap, 0, 0, null);
          canvas.restore();
          mC.restore();
          mCSpin.restore();
      }
  
  }
  