QuickAction.java

package com.yixia.zi.widget.quickaction;

import com.yixia.zi.R;
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.widget.ImageView;
import android.widget.ScrollView;
import android.widget.TextView;

/**
 * Popup window, shows action list as icon and text like the one in Gallery3D
 * app.
 * 
 * @author Lorensius. W. T
 * @author Cedric Fung (wolfplanet@gmail.com)
 */
public class QuickAction extends PopupWindows {
	private View mRootView;
	private ImageView mArrowUp;
	private ImageView mArrowDown;
	private LayoutInflater inflater;
	private ViewGroup mTrack;
	private ScrollView mScroller;
	private OnActionItemClickListener mListener;

	protected static final int ANIM_GROW_FROM_LEFT = 1;
	protected static final int ANIM_GROW_FROM_RIGHT = 2;
	protected static final int ANIM_GROW_FROM_CENTER = 3;
	protected static final int ANIM_REFLECT = 4;
	protected static final int ANIM_AUTO = 5;

	private int mChildPos;
	private int animStyle;

	/**
	 * Constructor.
	 * 
	 * @param context Context
	 */
	public QuickAction(Context context) {
		super(context);

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

		setRootViewId(R.layout.quickaction);

		animStyle = ANIM_AUTO;
		mChildPos = 0;
	}

	/**
	 * 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);

		mScroller = (ScrollView) mRootView.findViewById(R.id.scroller);

		setContentView(mRootView);
	}

	/**
	 * Set animation style
	 * 
	 * @param animStyle animation style, default is set to ANIM_AUTO
	 */
	public void setAnimStyle(int animStyle) {
		this.animStyle = animStyle;
	}

	/**
	 * Set listener for action item clicked.
	 * 
	 * @param listener Listener
	 */
	public void setOnActionItemClickListener(OnActionItemClickListener listener) {
		mListener = listener;
	}

	public int getActionCount() {
		return mChildPos;
	}

	/**
	 * Add action item
	 * 
	 * @param action {@link ActionItem}
	 */
	public void addActionItem(ActionItem action) {
		addActionItem(action, mChildPos);
	}

	public void addActionItem(ActionItem action, int position) {
		String title = action.getTitle();
		Drawable icon = action.getIcon();

		View container = (View) inflater.inflate(R.layout.quickaction_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 = position;

		container.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				if (mListener != null)
					mListener.onItemClick(pos);

				dismiss();
			}
		});

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

		mTrack.addView(container, position);

		mChildPos++;
	}

	public void removeActionItem(int position) {
		mTrack.removeViewAt(position);
		mChildPos--;
	}

	public View getActionItemView(int position) {
		return mTrack.getChildAt(position);
	}

	public void show(View anchor) {
		show(anchor, 0, 0);
	}

	/**
	 * Show popup window. Popup is automatically positioned, on top or bottom of
	 * anchor view.
	 * 
	 */
	@SuppressWarnings("deprecation")
  public void show(View anchor, int x, int y) {
		preShow();

		int xPos, yPos;

		int[] location = new int[2];

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

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

		//automatically get X coord of popup (top left)
		if ((anchorRect.left + rootWidth) > screenWidth) {
			xPos = anchorRect.left - (rootWidth - anchor.getWidth());
		} else {
			if (anchor.getWidth() > rootWidth) {
				xPos = anchorRect.centerX() - (rootWidth / 2);
			} else {
				xPos = anchorRect.left;
			}
		}

		int dyTop = anchorRect.top;
		int dyBottom = screenHeight - anchorRect.bottom;

		boolean onTop = (dyTop > dyBottom) ? true : false;

		if (onTop) {
			if (rootHeight > dyTop) {
				yPos = 15;
				LayoutParams l = mScroller.getLayoutParams();
				l.height = dyTop - anchor.getHeight();
			} else {
				yPos = anchorRect.top - rootHeight;
			}
		} else {
			yPos = anchorRect.bottom;

			if (rootHeight > dyBottom) {
				LayoutParams l = mScroller.getLayoutParams();
				l.height = dyBottom;
			}
		}

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

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

		if (onTop)
			mWindow.showAtLocation(anchor, Gravity.NO_GRAVITY, xPos + x, yPos - y);
		else
			mWindow.showAtLocation(anchor, Gravity.NO_GRAVITY, xPos + x, yPos + y);
	}

	/**
	 * Set animation style
	 * 
	 * @param screenWidth screen width
	 * @param requestedX distance from left edge
	 * @param onTop flag to indicate where the popup should be displayed. Set TRUE
	 * if displayed on top of anchor view and vice versa
	 */
	private void setAnimationStyle(int screenWidth, int requestedX, boolean onTop) {
		int arrowPos = requestedX - mArrowUp.getMeasuredWidth() / 2;

		switch (animStyle) {
		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_REFLECT:
			mWindow.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Reflect : R.style.Animations_PopDownMenu_Reflect);
			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_PopUpMenu_Right : R.style.Animations_PopDownMenu_Right);
			}

			break;
		}
	}

	/**
	 * Show arrow
	 * 
	 * @param whichArrow arrow type resource id
	 * @param requestedX distance from left screen
	 */
	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);
	}

	/**
	 * Listener for item click
	 * 
	 */
	public interface OnActionItemClickListener {
		public abstract void onItemClick(int pos);
	}
}