应用源码之CarouselDemo(.zip

package com.carouseldemo.controls; import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import com.carouseldemo.main.R; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Bitmap; import android.graphics.Camera; import android.graphics.Canvas; import android.graphics.LinearGradient; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.PorterDuffXfermode; import android.graphics.Rect; import android.graphics.Bitmap.Config; import android.graphics.PorterDuff.Mode; import android.graphics.Shader.TileMode; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.util.AttributeSet; import android.util.Log; import android.view.GestureDetector; import android.view.Gravity; import android.view.HapticFeedbackConstants; import android.view.KeyEvent; import android.view.MotionEvent; import android.view.SoundEffectConstants; import android.view.View; import android.view.ViewConfiguration; import android.view.ViewGroup; import android.view.ContextMenu.ContextMenuInfo; import android.view.animation.Transformation; import android.widget.BaseAdapter; /** * * @author kushnarev * Carousel class */ public class Carousel extends CarouselSpinner implements GestureDetector.OnGestureListener { // [start] Static private members /** * Tag for a class logging */ private static final String TAG = Carousel.class.getSimpleName(); /** * If logging should be inside class */ private static final boolean localLOGV = false; /** * Default min quantity of images */ private static final int MIN_QUANTITY = 3; /** * Default max quantity of images */ private static final int MAX_QUANTITY = 12; /** * Max theta */ private static final float MAX_THETA = 15.0f; /** * Duration in milliseconds from the start of a scroll during which we're * unsure whether the user is scrolling or flinging. */ private static final int SCROLL_TO_FLING_UNCERTAINTY_TIMEOUT = 250; // [end] // [start] Private members /** * The info for adapter context menu */ private AdapterContextMenuInfo mContextMenuInfo; /** * How long the transition animation should run when a child view changes * position, measured in milliseconds. */ private int mAnimationDuration = 900; /** * Camera to make 3D rotation */ private Camera mCamera = new Camera(); /** * Sets mSuppressSelectionChanged = false. This is used to set it to false * in the future. It will also trigger a selection changed. */ private Runnable mDisableSuppressSelectionChangedRunnable = new Runnable() { public void run() { mSuppressSelectionChanged = false; selectionChanged(); } }; /** * The position of the item that received the user's down touch. */ private int mDownTouchPosition; /** * The view of the item that received the user's down touch. */ private View mDownTouchView; /** * Executes the delta rotations from a fling or scroll movement. */ private FlingRotateRunnable mFlingRunnable = new FlingRotateRunnable(); /** * Helper for detecting touch gestures. */ private GestureDetector mGestureDetector; /** * Gravity for the widget */ private int mGravity; /** * If true, this onScroll is the first for this user's drag (remember, a * drag sends many onScrolls). */ private boolean mIsFirstScroll; /** * Set max qantity of images */ private int mMaxQuantity = MAX_QUANTITY; /** * Set min quantity of images */ private int mMinQuantity = MIN_QUANTITY; /** * If true, we have received the "invoke" (center or enter buttons) key * down. This is checked before we action on the "invoke" key up, and is * subsequently cleared. */ private boolean mReceivedInvokeKeyDown; /** * The currently selected item's child. */ private View mSelectedChild; /** * Whether to continuously callback on the item selected listener during a * fling. */ private boolean mShouldCallbackDuringFling = true; /** * Whether to callback when an item that is not selected is clicked. */ private boolean mShouldCallbackOnUnselectedItemClick = true; /** * When fling runnable runs, it resets this to false. Any method along the * path until the end of its run() can set this to true to abort any * remaining fling. For example, if we've reached either the leftmost or * rightmost item, we will set this to true. */ private boolean mShouldStopFling; /** * If true, do not callback to item selected listener. */ private boolean mSuppressSelectionChanged; /** * The axe angle */ private float mTheta = (float)(15.0f*(Math.PI/180.0)); /** * If items should be reflected */ private boolean mUseReflection; // [end] // [start] Constructors public Carousel(Context context) { this(context, null); } public Carousel(Context context, AttributeSet attrs) { this(context, attrs, 0); } public Carousel(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // It's needed to make items with greater value of // z coordinate to be behind items with lesser z-coordinate setChildrenDrawingOrderEnabled(true); // Making user gestures available mGestureDetector = new GestureDetector(this); mGestureDetector.setIsLongpressEnabled(true); // It's needed to apply 3D transforms to items // before they are drawn setStaticTransformationsEnabled(true); // Retrieve settings TypedArray arr = getContext().obtainStyledAttributes(attrs, R.styleable.Carousel); mAnimationDuration = arr.getInteger(R.styleable.Carousel_android_animationDuration, 400); mUseReflection = arr.getBoolean(R.styleable.Carousel_UseReflection, false); int selectedItem = arr.getInteger(R.styleable.Carousel_SelectedItem, 0); int imageArrayID = arr.getResourceId(R.styleable.Carousel_Items, -1); TypedArray images = getResources().obtainTypedArray(imageArrayID); int min = arr.getInteger(R.styleable.Carousel_minQuantity, MIN_QUANTITY); int max = arr.getInteger(R.styleable.Carousel_maxQuantity, MAX_QUANTITY); float mTheta = arr.getFloat(R.styleable.Carousel_maxTheta, MAX_THETA); if(mTheta > MAX_THETA || mTheta < 0.0f) mTheta = MAX_THETA; mMinQuantity = min < MIN_QUANTITY ? MIN_QUANTITY : min; mMaxQuantity = max > MAX_QUANTITY ? MAX_QUANTITY : max; if(arr.length() < mMinQuantity || arr.length() > mMaxQuantity) throw new IllegalArgumentException("Invalid set of items."); // Initialize image adapter ImageAdapter adapter = new ImageAdapter(getContext()); adapter.SetImages(images, mUseReflection); setAdapter(adapter); if(selectedItem < 0 || selectedItem >= adapter.getCount()) selectedItem = 0; // next time we go through layout with this value setNextSelectedPositionInt(selectedItem); } // [end] // [start] View overrides // [start] These are for use with horizontal scrollbar /** * Compute the horizontal extent of the horizontal scrollbar's thumb * within the horizontal range. This value is used to compute * the length of the thumb within the scrollbar's track. */ @Override protected int computeHorizontalScrollExtent() { // Only 1 item is