package com.test.canvas; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Rect; import android.os.Handler; import android.os.Message; import android.util.AttributeSet; import android.util.Log; import android.view.GestureDetector; import android.view.GestureDetector.SimpleOnGestureListener; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.view.animation.Interpolator; import android.widget.LinearLayout; import android.widget.Scroller; import android.widget.SpinnerAdapter; public class Switcher extends ViewGroup { private static final int SCROLL = 0; private static final int JUSTIFY = 1; private static final int DISMISS_CONTROLS = 2; // private static final int ANIMATION_DURATION = 750; // private static final int IDLE_TIMEOUT = 3 * 1000; private int mOrientation; //宽度或高度,具体根据Orientation来决定 private int mSize; //private Drawable mDecreaseButtonDrawable; //private Drawable mIncreaseButtonDrawable; //private ImageButton mDecreaseButton; //private ImageButton mIncreaseButton; //private PopupWindow mDecreasePopup; //private PopupWindow mIncreasePopup; private int mIndex; private int mPosition; private Scroller mScroller; private Map<View, Integer> mViews; private SpinnerAdapter mAdapter; private int mPackedViews; private GestureDetector mGestureDetector; private Rect mGlobal; private int mAnimationDuration; public Switcher(Context context, AttributeSet attrs) { super(context, attrs); int[] linerarLayoutAttrs = { android.R.attr.orientation }; TypedArray a = context.obtainStyledAttributes(attrs, linerarLayoutAttrs); mOrientation = a.getInteger(0, LinearLayout.HORIZONTAL); a.recycle(); // a = context.obtainStyledAttributes(attrs, R.styleable.Switcher); // mDecreaseButtonDrawable = a.getDrawable(R.styleable.Switcher_decreaseButton); // mIncreaseButtonDrawable = a.getDrawable(R.styleable.Switcher_increaseButton); // mAnimationDuration = a.getInteger(R.styleable.Switcher_animationDuration, ANIMATION_DURATION); // mIdleTimeout = a.getInteger(R.styleable.Switcher_idleTimeout, IDLE_TIMEOUT); // a.recycle(); // if(mDecreaseButtonDrawable == null) { // throw new IllegalArgumentException(a.getPositionDescription() + ": decreaseButton attrubute not specified."); // } // if(mIncreaseButtonDrawable == null) { // throw new IllegalArgumentException(a.getPositionDescription() + ": increaseButton attrubute not specified."); // } // mDecreaseButton = new ImageButton(context); // mDecreaseButton.setEnabled(false); // mDecreaseButton.setBackgroundDrawable(mDecreaseButtonDrawable); // mIncreaseButton = new ImageButton(context); // mIncreaseButton.setEnabled(false); // mIncreaseButton.setBackgroundDrawable(mIncreaseButtonDrawable); // // mDecreaseButton.setOnClickListener(new OnClickListener() { // public void onClick(View v) { // setPreviousView(); // } // }); // mIncreaseButton.setOnClickListener(new OnClickListener() { // public void onClick(View v) { // setNextView(); // } // }); mScroller = new Scroller(context); mIndex = -1; mPosition = -1; mPackedViews = -1; mViews = new HashMap<View, Integer>(); mGestureDetector = new GestureDetector(gestureListener); mGestureDetector.setIsLongpressEnabled(false); setFocusable(true); setFocusableInTouchMode(true); // mDecreasePopup = new PopupWindow(mDecreaseButton, mDecreaseButtonDrawable.getIntrinsicWidth(), mDecreaseButtonDrawable.getIntrinsicHeight()); // mIncreasePopup = new PopupWindow(mIncreaseButton, mIncreaseButtonDrawable.getIntrinsicWidth(), mIncreaseButtonDrawable.getIntrinsicHeight()); // mDecreasePopup.setAnimationStyle(android.R.style.Animation_Toast); // mIncreasePopup.setAnimationStyle(android.R.style.Animation_Toast); mGlobal = new Rect(); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); mSize = mOrientation == LinearLayout.HORIZONTAL? getMeasuredWidth() : getMeasuredHeight(); } private int getPackedViews(int offset) { int size = mSize; int start = offset / size; int numViews = offset % size != 0? 1 : 0; //都是位操作,从左往右依次执行,如果offset能被size整除则直接得出结果,如果不能整除,则结果再加1. return start << 1 | numViews; } Handler handler = new Handler() { @Override public void handleMessage(Message msg) { if (msg.what == DISMISS_CONTROLS) { // mDecreasePopup.dismiss(); // mIncreasePopup.dismiss(); return; } Log.v("", "handleMessage-what:"+msg.what); mScroller.computeScrollOffset(); int currX = mScroller.getCurrX(); int delta = mPosition - currX; mPosition = currX; int packed = getPackedViews(mPosition); manageViews(packed); scroll(delta); if (!mScroller.isFinished()) { Log.v("", "mScroller.isFinished()=false"); handler.sendEmptyMessage(msg.what); } else { if (msg.what == SCROLL) { justify(); } else { mIndex = mPosition / mSize; setupButtons(); } } } }; // private long mIdleTimeout; //最后的矫正 private void justify() { int offset = mPosition % mSize; if (offset != 0) { int endPosition = mPosition - offset; //如果移动超过中线则... if (offset > mSize / 2) { endPosition += mSize; } mScroller.startScroll(mPosition, 0, endPosition - mPosition, 0); handler.sendEmptyMessage(JUSTIFY); } else { mIndex = mPosition / mSize; setupButtons(); } } private void scroll(int offset) { if (mOrientation == LinearLayout.HORIZONTAL) { for (View view : mViews.keySet()) { view.offsetLeftAndRight(offset); } } else { for (View view : mViews.keySet()) { view.offsetTopAndBottom(offset); } } invalidate(); } private void setupButtons() { // if (mAdapter != null) { // boolean enabled = mIndex > 0; // mDecreaseButton.setEnabled(enabled); // enabled = mIndex + 1 < mAdapter.getCount(); // mIncreaseButton.setEnabled(enabled); // } } public void setSelection(int index, boolean animate) { if (index == mIndex) { return; } int endPosition = index * mSize; int diff = Math.abs(index - mIndex); int sign = index > mIndex? 1 : -1; mIndex = index; if (diff > 1) { mPosition = endPosition - sign * mSize; } if (animate) { mScroller.startScroll(mPosition, 0, endPosition - mPosition, 0, mAnimationDuration); handler.removeMessages(JUSTIFY); handler.removeMessages(SCROLL); handler.sendEmptyMessage(JUSTIFY); } else { mPosition = endPosition; manageViews(index << 1); setupButtons(); invalidate(); } } private void manageViews(int packedViews) { if (packedViews == mPackedViews) { return; } Log.v("", "manageViews-packedViews:"+packedViews); mPackedViews = packedViews; int startIdx = packedViews >> 1; int endIdx = startIdx + (packedViews & 1);//如果packedViews是奇数endIdx=startIdx,如果是偶数则endIdx=startIdx+1. int viewIdx = startIdx; while (viewIdx <= endIdx) { if (!mViews.containsValue(viewIdx)) { if (viewIdx >= 0 && viewIdx < mAdapter.getCount()) { View view = mAdapter.getView(viewIdx, null, this); mViews.put(view, viewIdx); addView(view); } } viewIdx++; } // remove not visible views Iterator<View> iterator = mViews.keySet().iterator(); while (iterator.hasNext()) { View view = iterator.next(); int idx = mViews.get(view); if (idx < startIdx || idx > endIdx) { iterator.remove(); removeView(view); } } } // public int getSelection() { // return mIndex; // } // // public void setPreviousView() { // if (mAdapter != null && mIndex > 0) { // setSelection(mIndex-1, true); // setupDismiss(); // } // } // // public void setNextView() { // if (mAdapter != null && mIndex + 1 < mAdapter.getCount()) { // setSelection(mIndex+1, true); // setupDismiss(); // } // } public void setAdapter(SpinnerAdapter adapter) { mAdapter = adapter; if (mAdapter != null) { setSelection(0, false); setupButtons(); } } private void setupDismiss() { // handler.removeMessages(DISMISS_CONTROLS); // handler.sendEmptyMessageDelayed(DISMISS_CONTROLS, mIdleTimeout); } @Override public boolean onTouchEvent(MotionEvent event) { boolean rc = mGestureDetector.onTouchEvent(event); //有数据时应该是没有机会执行里面的代码 if (!rc && event.getAction() == MotionEvent.ACTION_UP) { justify(); } return true; } SimpleOnGestureListener gestureListener = new SimpleOnGestureListener() { @Override public boolean onDown(MotionEvent e) { requestFocus(); popup(); return true; } @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { if (mAdapter != null) { int distance = (int) (mOrientation == LinearLayout.HORIZONTAL? distanceX : distanceY); int pos = mPosition + distance; if (pos >= 0 && pos < (mAdapter.getCount() - 1) * mSize) { mPosition = pos; int packed = getPackedViews(mPosition); manageViews(packed); scroll(-distance); return true; } } return false; } @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { if (mAdapter != null) { Log.v("", "onFling"); float velocity = mOrientation == LinearLayout.HORIZONTAL? velocityX : velocityY; mScroller.fling(mPosition, 0, (int) -velocity, 0, 0, (mAdapter.getCount() - 1) * mSize, 0, 0); handler.removeMessages(JUSTIFY); handler.removeMessages(SCROLL); handler.sendEmptyMessage(SCROLL); return true; } return false; } }; @Override protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { super.onFocusChanged(gainFocus, direction, previouslyFocusedRect); if (gainFocus) { popup(); } else { handler.removeMessages(DISMISS_CONTROLS); // mDecreasePopup.dismiss(); // mIncreasePopup.dismiss(); } } private void popup() { // if (mDecreasePopup.isShowing() && mIncreasePopup.isShowing()) { // return; // } getGlobalVisibleRect(mGlobal); // if (mOrientation == LinearLayout.HORIZONTAL) { // mDecreasePopup.showAtLocation(this, // Gravity.NO_GRAVITY, // mGlobal.left, // mGlobal.centerY() - mDecreasePopup.getHeight()/2); // mIncreasePopup.showAtLocation(this, // Gravity.NO_GRAVITY, // mGlobal.right - mIncreasePopup.getWidth(), // mGlobal.centerY() - mIncreasePopup.getHeight()/2); // } else { // // TODO: re-position when Switcher is at the very top/bottom of screen // mDecreasePopup.showAtLocation(this, // Gravity.NO_GRAVITY, // mGlobal.centerX() - mDecreasePopup.getWidth()/2, // mGlobal.top-mDecreasePopup.getHeight()); // mIncreasePopup.showAtLocation(this, // Gravity.NO_GRAVITY, // mGlobal.centerX() - mIncreasePopup.getWidth()/2, // mGlobal.bottom); // } setupDismiss(); } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { for (View view : mViews.keySet()) { if (view.getWidth() == 0) { // new View: not layout()ed int idx = mViews.get(view); if (mOrientation == LinearLayout.HORIZONTAL) { int left = mSize * idx - mPosition; view.layout(left, 0, left+r-l, b-t); } else { int top = mSize * idx - mPosition; view.layout(0, top, r-l, top+b-t); } } } } @Override protected void onDetachedFromWindow() { super.onDetachedFromWindow(); // mDecreasePopup.dismiss(); // mIncreasePopup.dismiss(); } public void setInterpolator(Interpolator interpolator) { mScroller = new Scroller(getContext(), interpolator); } }
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