QuickAction.java

package com.sgxp.asgmt1.quickaction;

import java.util.ArrayList;
import java.util.List;

import android.content.Context;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.view.animation.Interpolator;
import android.widget.ImageView;
import android.widget.PopupWindow.OnDismissListener;
import android.widget.TextView;

import com.group.studyproject.R;


public class QuickAction extends PopupWindows implements OnDismissListener {
	private ImageView mArrowUp;
	private ImageView mArrowDown;
	private Animation mTrackAnim;
	private LayoutInflater inflater;
	private ViewGroup mTrack;
	private OnActionItemClickListener mItemClickListener;
	private OnDismissListener mDismissListener;

	private List<ActionItem> mActionItemList = new ArrayList<ActionItem>();

	private boolean mDidAction;
	private boolean mAnimateTrack;

	private int mChildPos;
	private int mAnimStyle;

	public static final int ANIM_GROW_FROM_LEFT = 1;
	public static final int ANIM_GROW_FROM_RIGHT = 2;
	public static final int ANIM_GROW_FROM_CENTER = 3;
	public static final int ANIM_AUTO = 4;


	public QuickAction(Context context) {
		super(context);

		inflater = (LayoutInflater) context
				.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

		mTrackAnim = AnimationUtils.loadAnimation(context, R.anim.asgmt1_rail);

		mTrackAnim.setInterpolator(new Interpolator() {
			public float getInterpolation(float t) {
				// Pushes past the target area, then snaps back into place.
				// Equation for graphing: 1.2-((x*1.6)-1.1)^2
				final float inner = (t * 1.55f) - 1.1f;

				return 1.2f - inner * inner;
			}
		});

		setRootViewId(R.layout.asgmt1_quick_action);

		mAnimStyle = ANIM_AUTO;
		mAnimateTrack = true;
		mChildPos = 0;
	}


	public ActionItem getActionItem(int index) {
		return mActionItemList.get(index);
	}

	/**
	 * Set root view.
	 * 
	 * @param id
	 *            Layout resource id
	 */
	public void setRootViewId(int id) {
		mRootView = (ViewGroup) inflater.inflate(id, null);
		mTrack = (ViewGroup) mRootView.findViewById(R.id.tracks);

		mArrowDown = (ImageView) mRootView.findViewById(R.id.arrow_down);
		mArrowUp = (ImageView) mRootView.findViewById(R.id.arrow_up);

		mRootView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
				LayoutParams.WRAP_CONTENT));

		setContentView(mRootView);
	}

	public void mAnimateTrack(boolean mAnimateTrack) {
		this.mAnimateTrack = mAnimateTrack;
	}

	public void setAnimStyle(int mAnimStyle) {
		this.mAnimStyle = mAnimStyle;
	}

	public void addActionItem(ActionItem action) {
		mActionItemList.add(action);

		String title = action.getTitle();
		Drawable icon = action.getIcon();

		View container = (View) inflater.inflate(R.layout.asgmt1_action_item, null);

		ImageView img = (ImageView) container.findViewById(R.id.iv_icon);
		TextView text = (TextView) container.findViewById(R.id.tv_title);

		if (icon != null) {
			img.setImageDrawable(icon);
		} else {
			img.setVisibility(View.GONE);
		}

		if (title != null) {
			text.setText(title);
		} else {
			text.setVisibility(View.GONE);
		}

		final int pos = mChildPos;
		final int actionId = action.getActionId();

		container.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				if (mItemClickListener != null) {
					mItemClickListener.onItemClick(QuickAction.this, pos,
							actionId);
				}

				if (!getActionItem(pos).isSticky()) {
					mDidAction = true;

					// workaround for transparent background bug
					// thx to Roman Wozniak <roman.wozniak@gmail.com>
					v.post(new Runnable() {
						@Override
						public void run() {
							dismiss();
						}
					});
				}
			}
		});

		container.setFocusable(true);
		container.setClickable(true);

		mTrack.addView(container, mChildPos + 1);

		mChildPos++;
	}

	public void setOnActionItemClickListener(OnActionItemClickListener listener) {
		mItemClickListener = listener;
	}

	public void show(View anchor) {
		preShow();

		int[] location = new int[2];

		mDidAction = false;

		anchor.getLocationOnScreen(location);

		Rect anchorRect = new Rect(location[0], location[1], location[0]
				+ anchor.getWidth(), location[1] + anchor.getHeight());

		// mRootView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
		// LayoutParams.WRAP_CONTENT));
		mRootView.measure(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

		int rootWidth = mRootView.getMeasuredWidth();
		int rootHeight = mRootView.getMeasuredHeight();

		int screenWidth = mWindowManager.getDefaultDisplay().getWidth();
		// int screenHeight = mWindowManager.getDefaultDisplay().getHeight();

		int xPos = (screenWidth - rootWidth) / 2;
		int yPos = anchorRect.top - rootHeight;

		boolean onTop = true;

		// display on bottom
		if (rootHeight > anchor.getTop()) {
			yPos = anchorRect.bottom;
			onTop = false;
		}

		// showArrow(((onTop) ? R.id.arrow_down :
		// R.id.arrow_up),anchorRect.centerX());

		showArrow(((onTop) ? R.id.arrow_down : R.id.arrow_up), anchorRect.right);

		setAnimationStyle(screenWidth, anchorRect.centerX(), onTop);

		mWindow.showAtLocation(anchor, Gravity.NO_GRAVITY, xPos, yPos);

		if (mAnimateTrack)
			mTrack.startAnimation(mTrackAnim);
	}

	private void setAnimationStyle(int screenWidth, int requestedX,
			boolean onTop) {
		int arrowPos = requestedX - mArrowUp.getMeasuredWidth() / 2;

		switch (mAnimStyle) {
		case ANIM_GROW_FROM_LEFT:
			mWindow.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Left
					: R.style.Animations_PopDownMenu_Left);
			break;

		case ANIM_GROW_FROM_RIGHT:
			mWindow.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Right
					: R.style.Animations_PopDownMenu_Right);
			break;

		case ANIM_GROW_FROM_CENTER:
			mWindow.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Center
					: R.style.Animations_PopDownMenu_Center);
			break;

		case ANIM_AUTO:
			if (arrowPos <= screenWidth / 4) {
				mWindow.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Left
						: R.style.Animations_PopDownMenu_Left);
			} else if (arrowPos > screenWidth / 4
					&& arrowPos < 3 * (screenWidth / 4)) {
				mWindow.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Center
						: R.style.Animations_PopDownMenu_Center);
			} else {
				mWindow.setAnimationStyle((onTop) ? R.style.Animations_PopDownMenu_Right
						: R.style.Animations_PopDownMenu_Right);
			}

			break;
		}
	}

	private void showArrow(int whichArrow, int requestedX) {
		final View showArrow = (whichArrow == R.id.arrow_up) ? mArrowUp
				: mArrowDown;
		final View hideArrow = (whichArrow == R.id.arrow_up) ? mArrowDown
				: mArrowUp;

		final int arrowWidth = mArrowUp.getMeasuredWidth();

		showArrow.setVisibility(View.VISIBLE);

		ViewGroup.MarginLayoutParams param = (ViewGroup.MarginLayoutParams) showArrow
				.getLayoutParams();

		param.leftMargin = requestedX - arrowWidth / 2;

		hideArrow.setVisibility(View.INVISIBLE);
	}

	public void setOnDismissListener(QuickAction.OnDismissListener listener) {
		setOnDismissListener(this);

		mDismissListener = listener;
	}

	@Override
	public void onDismiss() {
		if (!mDidAction && mDismissListener != null) {
			mDismissListener.onDismiss();
		}
	}

	public interface OnActionItemClickListener {
		public abstract void onItemClick(QuickAction source, int pos,
				int actionId);
	}

	public interface OnDismissListener {
		public abstract void onDismiss();
	}
}