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+package com.quansu.heifengwuliu.view.timeview;
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+
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+import android.content.Context;
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+import android.database.DataSetObserver;
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+import android.graphics.Canvas;
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+import android.graphics.Paint;
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+import android.graphics.drawable.Drawable;
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+import android.graphics.drawable.GradientDrawable;
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+import android.graphics.drawable.GradientDrawable.Orientation;
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+import android.util.AttributeSet;
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+import android.view.MotionEvent;
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+import android.view.View;
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+import android.view.ViewGroup.LayoutParams;
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+import android.view.animation.Interpolator;
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+import android.widget.LinearLayout;
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+
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+import com.quansu.heifengwuliu.R;
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+import com.quansu.heifengwuliu.view.timeview.adapter.WheelTimeViewAdapter;
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+
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+import java.util.LinkedList;
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+import java.util.List;
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+
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+
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+/**
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+ * Numeric wheel view.
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+ *
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+ * @author Yuri Kanivets
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+ */
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+public class WheelTimeView extends View {
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+
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+ /**
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+ * Top and bottom shadows colors
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+ *
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+ * */
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+ // TODO 设置透明度
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+ private int[] SHADOWS_COLORS = new int[] { 0xefffffff,
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+ 0xcfffffff, 0x3fffffff };
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+
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+ /** Top and bottom items offset (to hide that) */
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+ private static final int ITEM_OFFSET_PERCENT = 0;
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+
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+ /** Left and right padding value */
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+ private static final int PADDING = 10;
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+
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+ /** Default count of visible items */
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+ // TODO 默认显示几行数据
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+ private static final int DEF_VISIBLE_ITEMS = 5;
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+
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+ // Wheel Values
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+ private int currentItem = 0;
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+
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+ // Count of visible items
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+ private int visibleItems = DEF_VISIBLE_ITEMS;
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+
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+ // Item height
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+ private int itemHeight = 0;
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+
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+ // Center Line
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+ private Drawable centerDrawable;
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+
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+ // Wheel drawables
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+ //private int wheelBackground = R.drawable.wheel_bg;
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+ private int wheelForeground = R.drawable.wheel_val_time;
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+
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+ // Shadows drawables
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+ private GradientDrawable topShadow;
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+ private GradientDrawable bottomShadow;
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+
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+ // Draw Shadows
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+ private boolean drawShadows = true;
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+
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+ // Scrolling
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+ private WheelTimeScroller scroller;
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+ private boolean isScrollingPerformed;
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+ private int scrollingOffset;
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+
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+ // Cyclic
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+ boolean isCyclic = false;
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+
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+ // Items layout
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+ private LinearLayout itemsLayout;
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+
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+ // The number of first item in layout
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+ private int firstItem;
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+
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+ // View adapter
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+ private WheelTimeViewAdapter viewAdapter;
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+
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+ // Recycle
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+ private WheelTimeRecycle recycle = new WheelTimeRecycle(this);
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+
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+ // Listeners
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+ private List<OnWheelTimeChangedListener> changingListeners = new LinkedList<OnWheelTimeChangedListener>();
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+ private List<OnWheelTimeScrollListener> scrollingListeners = new LinkedList<OnWheelTimeScrollListener>();
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+ private List<OnWheelTimeClickedListener> clickingListeners = new LinkedList<OnWheelTimeClickedListener>();
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+
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+ String label="";
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+
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+ /**
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+ * Constructor
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+ */
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+ public WheelTimeView(Context context, AttributeSet attrs, int defStyle) {
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+ super(context, attrs, defStyle);
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+ initData(context);
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+ }
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+
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+ /**
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+ * Constructor
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+ */
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+ public WheelTimeView(Context context, AttributeSet attrs) {
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+ super(context, attrs);
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+ initData(context);
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+ }
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+
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+ /**
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+ * Constructor
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+ */
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+ public WheelTimeView(Context context) {
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+ super(context);
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+ initData(context);
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+ }
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+
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+ /**
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+ * Initializes class data
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+ * @param context the context
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+ */
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+ private void initData(Context context) {
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+ scroller = new WheelTimeScroller(getContext(), scrollingListener);
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+ }
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+
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+ // Scrolling listener
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+ WheelTimeScroller.ScrollingListener scrollingListener = new WheelTimeScroller.ScrollingListener() {
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+ @Override
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+ public void onStarted() {
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+ isScrollingPerformed = true;
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+ notifyScrollingListenersAboutStart();
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+ }
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+
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+ @Override
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+ public void onScroll(int distance) {
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+ doScroll(distance);
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+
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+ int height = getHeight();
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+ if (scrollingOffset > height) {
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+ scrollingOffset = height;
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+ scroller.stopScrolling();
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+ } else if (scrollingOffset < -height) {
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+ scrollingOffset = -height;
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+ scroller.stopScrolling();
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+ }
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+ }
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+
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+ @Override
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+ public void onFinished() {
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+ if (isScrollingPerformed) {
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+ notifyScrollingListenersAboutEnd();
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+ isScrollingPerformed = false;
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+ }
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+
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+ scrollingOffset = 0;
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+ invalidate();
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+ }
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+
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+ @Override
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+ public void onJustify() {
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+ if (Math.abs(scrollingOffset) > WheelTimeScroller.MIN_DELTA_FOR_SCROLLING) {
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+ scroller.scroll(scrollingOffset, 0);
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+ }
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+ }
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+ };
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+
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+ /**
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+ * Set the the specified scrolling interpolator
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+ * @param interpolator the interpolator
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+ */
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+ public void setInterpolator(Interpolator interpolator) {
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+ scroller.setInterpolator(interpolator);
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+ }
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+
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+ /**
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+ * Gets count of visible items
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+ *
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+ * @return the count of visible items
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+ */
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+ public int getVisibleItems() {
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+ return visibleItems;
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+ }
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+
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+ /**
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+ * Sets the desired count of visible items.
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+ * Actual amount of visible items depends on wheel layout parameters.
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+ * To apply changes and rebuild view call measure().
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+ *
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+ * @param count the desired count for visible items
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+ */
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+ public void setVisibleItems(int count) {
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+ visibleItems = count;
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+ }
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+
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+ /**
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+ * Gets view adapter
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+ * @return the view adapter
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+ */
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+ public WheelTimeViewAdapter getViewAdapter() {
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+ return viewAdapter;
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+ }
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+
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+ // Adapter listener
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+ private DataSetObserver dataObserver = new DataSetObserver() {
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+ @Override
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+ public void onChanged() {
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+ invalidateWheel(false);
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+ }
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+
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+ @Override
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+ public void onInvalidated() {
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+ invalidateWheel(true);
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+ }
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+ };
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+
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+ /**
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+ * Sets view adapter. Usually new adapters contain different views, so
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+ * it needs to rebuild view by calling measure().
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+ *
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+ * @param viewAdapter the view adapter
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+ */
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+ public void setViewAdapter(WheelTimeViewAdapter viewAdapter) {
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+ if (this.viewAdapter != null) {
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+ this.viewAdapter.unregisterDataSetObserver(dataObserver);
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+ }
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+ this.viewAdapter = viewAdapter;
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+ if (this.viewAdapter != null) {
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+ this.viewAdapter.registerDataSetObserver(dataObserver);
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+ }
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+
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+ invalidateWheel(true);
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+ }
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+
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+ /**
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+ * Adds wheel changing listener
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+ * @param listener the listener
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+ */
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+ public void addChangingListener(OnWheelTimeChangedListener listener) {
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+ changingListeners.add(listener);
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+ }
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+
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+ /**
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+ * Removes wheel changing listener
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+ * @param listener the listener
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+ */
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+ public void removeChangingListener(OnWheelTimeChangedListener listener) {
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+ changingListeners.remove(listener);
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+ }
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+
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+ /**
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+ * Notifies changing listeners
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+ * @param oldValue the old wheel value
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+ * @param newValue the new wheel value
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+ */
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+ protected void notifyChangingListeners(int oldValue, int newValue) {
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+ for (OnWheelTimeChangedListener listener : changingListeners) {
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+ listener.onChanged(this, oldValue, newValue);
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+ }
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+ }
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+
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+ /**
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+ * Adds wheel scrolling listener
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+ * @param listener the listener
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+ */
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+ public void addScrollingListener(OnWheelTimeScrollListener listener) {
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+ scrollingListeners.add(listener);
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+ }
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+
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+ /**
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+ * Removes wheel scrolling listener
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+ * @param listener the listener
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+ */
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+ public void removeScrollingListener(OnWheelTimeScrollListener listener) {
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+ scrollingListeners.remove(listener);
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+ }
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+
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+ /**
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+ * Notifies listeners about starting scrolling
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+ */
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+ protected void notifyScrollingListenersAboutStart() {
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+ for (OnWheelTimeScrollListener listener : scrollingListeners) {
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+ listener.onScrollingStarted(this);
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+ }
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+ }
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+
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+ /**
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+ * Notifies listeners about ending scrolling
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+ */
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+ protected void notifyScrollingListenersAboutEnd() {
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+ for (OnWheelTimeScrollListener listener : scrollingListeners) {
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+ listener.onScrollingFinished(this);
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+ }
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+ }
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+
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+ /**
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+ * Adds wheel clicking listener
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+ * @param listener the listener
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+ */
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+ public void addClickingListener(OnWheelTimeClickedListener listener) {
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+ clickingListeners.add(listener);
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+ }
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+
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+ /**
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+ * Removes wheel clicking listener
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+ * @param listener the listener
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+ */
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+ public void removeClickingListener(OnWheelTimeClickedListener listener) {
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+ clickingListeners.remove(listener);
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+ }
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+
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+ /**
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+ * Notifies listeners about clicking
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+ */
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+ protected void notifyClickListenersAboutClick(int item) {
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+ for (OnWheelTimeClickedListener listener : clickingListeners) {
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+ listener.onItemClicked(this, item);
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+ }
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+ }
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+
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+ /**
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+ * Gets current value
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+ *
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+ * @return the current value
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+ */
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+ public int getCurrentItem() {
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+ return currentItem;
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+ }
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+
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+ /**
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+ * Sets the current item. Does nothing when index is wrong.
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+ *
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+ * @param index the item index
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+ * @param animated the animation flag
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+ */
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+ public void setCurrentItem(int index, boolean animated) {
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+ if (viewAdapter == null || viewAdapter.getItemsCount() == 0) {
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+ return; // throw?
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+ }
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+
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+ int itemCount = viewAdapter.getItemsCount();
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+ if (index < 0 || index >= itemCount) {
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+ if (isCyclic) {
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+ while (index < 0) {
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+ index += itemCount;
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+ }
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+ index %= itemCount;
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+ } else{
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+ return; // throw?
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+ }
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+ }
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+ if (index != currentItem) {
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+ if (animated) {
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+ int itemsToScroll = index - currentItem;
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+ if (isCyclic) {
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+ int scroll = itemCount + Math.min(index, currentItem) - Math.max(index, currentItem);
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+ if (scroll < Math.abs(itemsToScroll)) {
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+ itemsToScroll = itemsToScroll < 0 ? scroll : -scroll;
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+ }
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+ }
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+ scroll(itemsToScroll, 0);
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+ } else {
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+ scrollingOffset = 0;
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+
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+ int old = currentItem;
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+ currentItem = index;
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+
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+ notifyChangingListeners(old, currentItem);
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+
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+ invalidate();
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+ }
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+ }
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+ }
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+
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+ /**
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+ * Sets the current item w/o animation. Does nothing when index is wrong.
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+ *
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+ * @param index the item index
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+ */
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+ public void setCurrentItem(int index) {
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+ setCurrentItem(index, false);
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+ }
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+
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+ /**
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+ * Tests if wheel is cyclic. That means before the 1st item there is shown the last one
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+ * @return true if wheel is cyclic
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+ */
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+ public boolean isCyclic() {
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+ return isCyclic;
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+ }
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+
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+ /**
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+ * Set wheel cyclic flag
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+ * @param isCyclic the flag to set
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+ */
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+ public void setCyclic(boolean isCyclic) {
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+ this.isCyclic = isCyclic;
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+ invalidateWheel(false);
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+ }
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+
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+ /**
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+ * Determine whether shadows are drawn
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+ * @return true is shadows are drawn
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+ */
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+ public boolean drawShadows() {
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+ return drawShadows;
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+ }
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+
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+ /**
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+ * Set whether shadows should be drawn
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+ * @param drawShadows flag as true or false
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+ */
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+ public void setDrawShadows(boolean drawShadows) {
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+ this.drawShadows = drawShadows;
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+ }
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+
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+ /**
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+ * Set the shadow gradient color
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+ * @param start
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+ * @param middle
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+ * @param end
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+ */
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+ public void setShadowColor(int start, int middle, int end) {
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+ SHADOWS_COLORS = new int[] {start, middle, end};
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+ }
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+
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+ /**
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+ * Sets the drawable for the wheel background
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+ * @param resource
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+ */
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+// public void setWheelBackground(int resource) {
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+// wheelBackground = resource;
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+// setBackgroundResource(wheelBackground);
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+// }
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+
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+ /**
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+ * Sets the drawable for the wheel foreground
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+ * @param resource
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+ */
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+ public void setWheelForeground(int resource) {
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+ wheelForeground = resource;
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+ centerDrawable = getContext().getResources().getDrawable(wheelForeground);
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+ }
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+
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+ /**
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+ * Invalidates wheel
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+ * @param clearCaches if true then cached views will be clear
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+ */
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+ public void invalidateWheel(boolean clearCaches) {
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+ if (clearCaches) {
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+ recycle.clearAll();
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+ if (itemsLayout != null) {
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+ itemsLayout.removeAllViews();
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+ }
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+ scrollingOffset = 0;
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+ } else if (itemsLayout != null) {
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+ // cache all items
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+ recycle.recycleItems(itemsLayout, firstItem, new ItemsRange());
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+ }
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+
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+ invalidate();
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+ }
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+
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+ /**
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+ * Initializes resources
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+ */
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+ private void initResourcesIfNecessary() {
|
|
|
+ if (centerDrawable == null) {
|
|
|
+ centerDrawable = getContext().getResources().getDrawable(wheelForeground);
|
|
|
+ }
|
|
|
+
|
|
|
+ if (topShadow == null) {
|
|
|
+ topShadow = new GradientDrawable(Orientation.TOP_BOTTOM, SHADOWS_COLORS);
|
|
|
+ }
|
|
|
+
|
|
|
+ if (bottomShadow == null) {
|
|
|
+ bottomShadow = new GradientDrawable(Orientation.BOTTOM_TOP, SHADOWS_COLORS);
|
|
|
+ }
|
|
|
+
|
|
|
+ // setBackgroundResource(wheelBackground);
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Calculates desired height for layout
|
|
|
+ *
|
|
|
+ * @param layout
|
|
|
+ * the source layout
|
|
|
+ * @return the desired layout height
|
|
|
+ */
|
|
|
+ private int getDesiredHeight(LinearLayout layout) {
|
|
|
+ if (layout != null && layout.getChildAt(0) != null) {
|
|
|
+ itemHeight = layout.getChildAt(0).getMeasuredHeight();
|
|
|
+ }
|
|
|
+
|
|
|
+ int desired = itemHeight * visibleItems - itemHeight * ITEM_OFFSET_PERCENT / 50;
|
|
|
+
|
|
|
+ return Math.max(desired, getSuggestedMinimumHeight());
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Returns height of wheel item
|
|
|
+ * @return the item height
|
|
|
+ */
|
|
|
+ private int getItemHeight() {
|
|
|
+ if (itemHeight != 0) {
|
|
|
+ return itemHeight;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (itemsLayout != null && itemsLayout.getChildAt(0) != null) {
|
|
|
+ itemHeight = itemsLayout.getChildAt(0).getHeight();
|
|
|
+ return itemHeight;
|
|
|
+ }
|
|
|
+
|
|
|
+ return getHeight() / visibleItems;
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Calculates control width and creates text layouts
|
|
|
+ * @param widthSize the input layout width
|
|
|
+ * @param mode the layout mode
|
|
|
+ * @return the calculated control width
|
|
|
+ */
|
|
|
+ private int calculateLayoutWidth(int widthSize, int mode) {
|
|
|
+ initResourcesIfNecessary();
|
|
|
+
|
|
|
+ // TODO: make it static
|
|
|
+ itemsLayout.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
|
|
|
+ itemsLayout.measure(MeasureSpec.makeMeasureSpec(widthSize, MeasureSpec.UNSPECIFIED),
|
|
|
+ MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
|
|
|
+ int width = itemsLayout.getMeasuredWidth();
|
|
|
+
|
|
|
+ if (mode == MeasureSpec.EXACTLY) {
|
|
|
+ width = widthSize;
|
|
|
+ } else {
|
|
|
+ width += 2 * PADDING;
|
|
|
+
|
|
|
+ // Check against our minimum width
|
|
|
+ width = Math.max(width, getSuggestedMinimumWidth());
|
|
|
+
|
|
|
+ if (mode == MeasureSpec.AT_MOST && widthSize < width) {
|
|
|
+ width = widthSize;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ itemsLayout.measure(MeasureSpec.makeMeasureSpec(width - 2 * PADDING, MeasureSpec.EXACTLY),
|
|
|
+ MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
|
|
|
+
|
|
|
+ return width;
|
|
|
+ }
|
|
|
+
|
|
|
+ @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);
|
|
|
+
|
|
|
+ buildViewForMeasuring();
|
|
|
+
|
|
|
+ int width = calculateLayoutWidth(widthSize, widthMode);
|
|
|
+
|
|
|
+ int height;
|
|
|
+ if (heightMode == MeasureSpec.EXACTLY) {
|
|
|
+ height = heightSize;
|
|
|
+ } else {
|
|
|
+ height = getDesiredHeight(itemsLayout);
|
|
|
+
|
|
|
+ if (heightMode == MeasureSpec.AT_MOST) {
|
|
|
+ height = Math.min(height, heightSize);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ setMeasuredDimension(width, height);
|
|
|
+ }
|
|
|
+
|
|
|
+ @Override
|
|
|
+ protected void onLayout(boolean changed, int l, int t, int r, int b) {
|
|
|
+ layout(r - l, b - t);
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Sets layouts width and height
|
|
|
+ * @param width the layout width
|
|
|
+ * @param height the layout height
|
|
|
+ */
|
|
|
+ private void layout(int width, int height) {
|
|
|
+ int itemsWidth = width - 2 * PADDING;
|
|
|
+
|
|
|
+ itemsLayout.layout(0, 0, itemsWidth, height);
|
|
|
+ }
|
|
|
+
|
|
|
+ @Override
|
|
|
+ protected void onDraw(Canvas canvas) {
|
|
|
+ super.onDraw(canvas);
|
|
|
+
|
|
|
+ if (viewAdapter != null && viewAdapter.getItemsCount() > 0) {
|
|
|
+ updateView();
|
|
|
+
|
|
|
+ drawItems(canvas);
|
|
|
+ drawCenterRect(canvas);
|
|
|
+ }
|
|
|
+
|
|
|
+ if (drawShadows) drawShadows(canvas);
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Draws shadows on top and bottom of control
|
|
|
+ * @param canvas the canvas for drawing
|
|
|
+ */
|
|
|
+ private void drawShadows(Canvas canvas) {
|
|
|
+ /*/ Modified by wulianghuan 2014-11-25
|
|
|
+ int height = (int)(1.5 * getItemHeight());
|
|
|
+ //*/
|
|
|
+ int height = (int)(3 * getItemHeight());
|
|
|
+ //*/
|
|
|
+ topShadow.setBounds(0, 0, getWidth(), height);
|
|
|
+ topShadow.draw(canvas);
|
|
|
+
|
|
|
+ bottomShadow.setBounds(0, getHeight() - height, getWidth(), getHeight());
|
|
|
+ bottomShadow.draw(canvas);
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Draws items
|
|
|
+ * @param canvas the canvas for drawing
|
|
|
+ */
|
|
|
+ private void drawItems(Canvas canvas) {
|
|
|
+ canvas.save();
|
|
|
+
|
|
|
+ int top = (currentItem - firstItem) * getItemHeight() + (getItemHeight() - getHeight()) / 2;
|
|
|
+ canvas.translate(PADDING, - top + scrollingOffset);
|
|
|
+
|
|
|
+ itemsLayout.draw(canvas);
|
|
|
+
|
|
|
+ canvas.restore();
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Draws rect for current value
|
|
|
+ * @param canvas the canvas for drawing
|
|
|
+ */
|
|
|
+ private void drawCenterRect(Canvas canvas) {
|
|
|
+ int center = getHeight() / 2;
|
|
|
+ int offset = (int) (getItemHeight() / 2 * 1.2);
|
|
|
+ /*/ Remarked by wulianghuan 2014-11-27 使用自己的画线,而不是描边
|
|
|
+ Rect rect = new Rect(left, top, right, bottom)
|
|
|
+ centerDrawable.setBounds(bounds)
|
|
|
+ centerDrawable.setBounds(0, center - offset, getWidth(), center + offset);
|
|
|
+ centerDrawable.draw(canvas);
|
|
|
+ //*/
|
|
|
+
|
|
|
+ // TODO 画线
|
|
|
+ Paint paint = new Paint();
|
|
|
+ paint.setColor(getResources().getColor(R.color.text_title));
|
|
|
+ // 设置线宽
|
|
|
+ paint.setStrokeWidth((float) 1);
|
|
|
+ // 绘制上边直线
|
|
|
+// canvas.drawLine(0, center - offset, getWidth(), center - offset, paint);
|
|
|
+ // 绘制下边直线
|
|
|
+ canvas.drawLine(0, center + offset, getWidth(), center + offset, paint);
|
|
|
+ }
|
|
|
+
|
|
|
+
|
|
|
+ @Override
|
|
|
+ public boolean onTouchEvent(MotionEvent event) {
|
|
|
+ if (!isEnabled() || getViewAdapter() == null) {
|
|
|
+ return true;
|
|
|
+ }
|
|
|
+
|
|
|
+ switch (event.getAction()) {
|
|
|
+ case MotionEvent.ACTION_MOVE:
|
|
|
+ if (getParent() != null) {
|
|
|
+ getParent().requestDisallowInterceptTouchEvent(true);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+
|
|
|
+ case MotionEvent.ACTION_UP:
|
|
|
+ if (!isScrollingPerformed) {
|
|
|
+ int distance = (int) event.getY() - getHeight() / 2;
|
|
|
+ if (distance > 0) {
|
|
|
+ distance += getItemHeight() / 2;
|
|
|
+ } else {
|
|
|
+ distance -= getItemHeight() / 2;
|
|
|
+ }
|
|
|
+ int items = distance / getItemHeight();
|
|
|
+ if (items != 0 && isValidItemIndex(currentItem + items)) {
|
|
|
+ notifyClickListenersAboutClick(currentItem + items);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ return scroller.onTouchEvent(event);
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Scrolls the wheel
|
|
|
+ * @param delta the scrolling value
|
|
|
+ */
|
|
|
+ private void doScroll(int delta) {
|
|
|
+ scrollingOffset += delta;
|
|
|
+
|
|
|
+ int itemHeight = getItemHeight();
|
|
|
+ int count = scrollingOffset / itemHeight;
|
|
|
+
|
|
|
+ int pos = currentItem - count;
|
|
|
+ int itemCount = viewAdapter.getItemsCount();
|
|
|
+
|
|
|
+ int fixPos = scrollingOffset % itemHeight;
|
|
|
+ if (Math.abs(fixPos) <= itemHeight / 2) {
|
|
|
+ fixPos = 0;
|
|
|
+ }
|
|
|
+ if (isCyclic && itemCount > 0) {
|
|
|
+ if (fixPos > 0) {
|
|
|
+ pos--;
|
|
|
+ count++;
|
|
|
+ } else if (fixPos < 0) {
|
|
|
+ pos++;
|
|
|
+ count--;
|
|
|
+ }
|
|
|
+ // fix position by rotating
|
|
|
+ while (pos < 0) {
|
|
|
+ pos += itemCount;
|
|
|
+ }
|
|
|
+ pos %= itemCount;
|
|
|
+ } else {
|
|
|
+ //
|
|
|
+ if (pos < 0) {
|
|
|
+ count = currentItem;
|
|
|
+ pos = 0;
|
|
|
+ } else if (pos >= itemCount) {
|
|
|
+ count = currentItem - itemCount + 1;
|
|
|
+ pos = itemCount - 1;
|
|
|
+ } else if (pos > 0 && fixPos > 0) {
|
|
|
+ pos--;
|
|
|
+ count++;
|
|
|
+ } else if (pos < itemCount - 1 && fixPos < 0) {
|
|
|
+ pos++;
|
|
|
+ count--;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ int offset = scrollingOffset;
|
|
|
+ if (pos != currentItem) {
|
|
|
+ setCurrentItem(pos, false);
|
|
|
+ } else {
|
|
|
+ invalidate();
|
|
|
+ }
|
|
|
+
|
|
|
+ // update offset
|
|
|
+ scrollingOffset = offset - count * itemHeight;
|
|
|
+ if (scrollingOffset > getHeight()) {
|
|
|
+ scrollingOffset = scrollingOffset % getHeight() + getHeight();
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Scroll the wheel
|
|
|
+ * @param time scrolling duration
|
|
|
+ */
|
|
|
+ public void scroll(int itemsToScroll, int time) {
|
|
|
+ int distance = itemsToScroll * getItemHeight() - scrollingOffset;
|
|
|
+ scroller.scroll(distance, time);
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Calculates range for wheel items
|
|
|
+ * @return the items range
|
|
|
+ */
|
|
|
+ private ItemsRange getItemsRange() {
|
|
|
+ if (getItemHeight() == 0) {
|
|
|
+ return null;
|
|
|
+ }
|
|
|
+
|
|
|
+ int first = currentItem;
|
|
|
+ int count = 1;
|
|
|
+
|
|
|
+ while (count * getItemHeight() < getHeight()) {
|
|
|
+ first--;
|
|
|
+ count += 2; // top + bottom items
|
|
|
+ }
|
|
|
+
|
|
|
+ if (scrollingOffset != 0) {
|
|
|
+ if (scrollingOffset > 0) {
|
|
|
+ first--;
|
|
|
+ }
|
|
|
+ count++;
|
|
|
+
|
|
|
+ // process empty items above the first or below the second
|
|
|
+ int emptyItems = scrollingOffset / getItemHeight();
|
|
|
+ first -= emptyItems;
|
|
|
+ count += Math.asin(emptyItems);
|
|
|
+ }
|
|
|
+ return new ItemsRange(first, count);
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Rebuilds wheel items if necessary. Caches all unused items.
|
|
|
+ *
|
|
|
+ * @return true if items are rebuilt
|
|
|
+ */
|
|
|
+ private boolean rebuildItems() {
|
|
|
+ boolean updated = false;
|
|
|
+ ItemsRange range = getItemsRange();
|
|
|
+ if (itemsLayout != null) {
|
|
|
+ int first = recycle.recycleItems(itemsLayout, firstItem, range);
|
|
|
+ updated = firstItem != first;
|
|
|
+ firstItem = first;
|
|
|
+ } else {
|
|
|
+ createItemsLayout();
|
|
|
+ updated = true;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!updated) {
|
|
|
+ updated = firstItem != range.getFirst() || itemsLayout.getChildCount() != range.getCount();
|
|
|
+ }
|
|
|
+
|
|
|
+ if (firstItem > range.getFirst() && firstItem <= range.getLast()) {
|
|
|
+ for (int i = firstItem - 1; i >= range.getFirst(); i--) {
|
|
|
+ if (!addViewItem(i, true)) {
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ firstItem = i;
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ firstItem = range.getFirst();
|
|
|
+ }
|
|
|
+
|
|
|
+ int first = firstItem;
|
|
|
+ for (int i = itemsLayout.getChildCount(); i < range.getCount(); i++) {
|
|
|
+ if (!addViewItem(firstItem + i, false) && itemsLayout.getChildCount() == 0) {
|
|
|
+ first++;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ firstItem = first;
|
|
|
+
|
|
|
+ return updated;
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Updates view. Rebuilds items and label if necessary, recalculate items sizes.
|
|
|
+ */
|
|
|
+ private void updateView() {
|
|
|
+ if (rebuildItems()) {
|
|
|
+ calculateLayoutWidth(getWidth(), MeasureSpec.EXACTLY);
|
|
|
+ layout(getWidth(), getHeight());
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Creates item layouts if necessary
|
|
|
+ */
|
|
|
+ private void createItemsLayout() {
|
|
|
+ if (itemsLayout == null) {
|
|
|
+ itemsLayout = new LinearLayout(getContext());
|
|
|
+ itemsLayout.setOrientation(LinearLayout.VERTICAL);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Builds view for measuring
|
|
|
+ */
|
|
|
+ private void buildViewForMeasuring() {
|
|
|
+ // clear all items
|
|
|
+ if (itemsLayout != null) {
|
|
|
+ recycle.recycleItems(itemsLayout, firstItem, new ItemsRange());
|
|
|
+ } else {
|
|
|
+ createItemsLayout();
|
|
|
+ }
|
|
|
+
|
|
|
+ // add views
|
|
|
+ int addItems = visibleItems / 2;
|
|
|
+ for (int i = currentItem + addItems; i >= currentItem - addItems; i--) {
|
|
|
+ if (addViewItem(i, true)) {
|
|
|
+ firstItem = i;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Adds view for item to items layout
|
|
|
+ * @param index the item index
|
|
|
+ * @param first the flag indicates if view should be first
|
|
|
+ * @return true if corresponding item exists and is added
|
|
|
+ */
|
|
|
+ private boolean addViewItem(int index, boolean first) {
|
|
|
+ View view = getItemView(index);
|
|
|
+ if (view != null) {
|
|
|
+ if (first) {
|
|
|
+ itemsLayout.addView(view, 0);
|
|
|
+ } else {
|
|
|
+ itemsLayout.addView(view);
|
|
|
+ }
|
|
|
+
|
|
|
+ return true;
|
|
|
+ }
|
|
|
+
|
|
|
+ return false;
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Checks whether intem index is valid
|
|
|
+ * @param index the item index
|
|
|
+ * @return true if item index is not out of bounds or the wheel is cyclic
|
|
|
+ */
|
|
|
+ private boolean isValidItemIndex(int index) {
|
|
|
+ return viewAdapter != null && viewAdapter.getItemsCount() > 0 &&
|
|
|
+ (isCyclic || index >= 0 && index < viewAdapter.getItemsCount());
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Returns view for specified item
|
|
|
+ * @param index the item index
|
|
|
+ * @return item view or empty view if index is out of bounds
|
|
|
+ */
|
|
|
+ private View getItemView(int index) {
|
|
|
+ if (viewAdapter == null || viewAdapter.getItemsCount() == 0) {
|
|
|
+ return null;
|
|
|
+ }
|
|
|
+ int count = viewAdapter.getItemsCount();
|
|
|
+ if (!isValidItemIndex(index)) {
|
|
|
+ return viewAdapter.getEmptyItem(recycle.getEmptyItem(), itemsLayout);
|
|
|
+ } else {
|
|
|
+ while (index < 0) {
|
|
|
+ index = count + index;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ index %= count;
|
|
|
+ return viewAdapter.getItem(index, recycle.getItem(), itemsLayout);
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Stops scrolling
|
|
|
+ */
|
|
|
+ public void stopScrolling() {
|
|
|
+ scroller.stopScrolling();
|
|
|
+ }
|
|
|
+}
|