QuickAction.java

package cn.walcl.ulauncher.quickactionbar;

import java.util.ArrayList;

import cn.walcl.ulauncher.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.ViewGroup;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.ImageView;
import android.widget.LinearLayout;
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
 */
public class QuickAction extends CustomPopupWindow {
	private final View root;
	private final ImageView mArrowUp;
	private final ImageView mArrowDown;
	private final LayoutInflater inflater;
	private final Context context;

	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 animStyle;
	private final ViewGroup mTrack;
	private final ScrollView scroller;
	private final ArrayList<ActionItem> actionList;

	/**
	 * Constructor
	 *
	 * @param anchor {@link View} on where the popup window should be displayed
	 */
	public QuickAction(View anchor) {
		super(anchor);

		actionList	= new ArrayList<ActionItem>();
		context		= anchor.getContext();
		inflater 	= (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

		root		= inflater.inflate(R.layout.popup, null);

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

		setContentView(root);

		mTrack 			= (ViewGroup) root.findViewById(R.id.tracks);
		scroller		= (ScrollView) root.findViewById(R.id.scroller);
		animStyle		= ANIM_AUTO;
	}

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

	/**
	 * Add action item
	 *
	 * @param action  {@link ActionItem} object
	 */
	public void addActionItem(ActionItem action) {
		actionList.add(action);
	}

	/**
	 * Show popup window. Popup is automatically positioned, on top or bottom of anchor view.
	 *
	 */
	public void show () {
		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());

		createActionList();

		root.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
		root.measure(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

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

		int screenWidth 	= windowManager.getDefaultDisplay().getWidth();
		int screenHeight	= windowManager.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 anchorHalfHeight = (anchorRect.height() / 2);
		int dyTop			 = anchorRect.top;
		int dyBottom	 	 = screenHeight - anchorRect.bottom;

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

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

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

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

		window.showAtLocation(anchor, Gravity.NO_GRAVITY, xPos, yPos);
	}

	/**
	 * 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:
			window.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Left : R.style.Animations_PopDownMenu_Left);
			break;

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

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

		case ANIM_REFLECT:
			window.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Reflect : R.style.Animations_PopDownMenu_Reflect);
		break;

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

			break;
		}
	}

	/**
	 * Create action list
	 */
	private void createActionList() {
		View view;
		String title;
		Drawable icon;
		OnClickListener listener;

		for (int i = 0; i < actionList.size(); i++) {
			title 		= actionList.get(i).getTitle();
			icon 		= actionList.get(i).getIcon();
			listener	= actionList.get(i).getListener();

			view 		= getActionItem(title, icon, listener);

			view.setFocusable(true);
			view.setClickable(true);

			mTrack.addView(view);
		}
	}

	/**
	 * Get action item {@link View}
	 *
	 * @param title action item title
	 * @param icon {@link Drawable} action item icon
	 * @param listener {@link View.OnClickListener} action item listener
	 * @return action item {@link View}
	 */
	private View getActionItem(String title, Drawable icon, OnClickListener listener) {
		LinearLayout container	= (LinearLayout) inflater.inflate(R.layout.action_item, null);

		ImageView img			= (ImageView) container.findViewById(R.id.icon);
		TextView text			= (TextView) container.findViewById(R.id.title);

		if (icon != null) {
			img.setImageDrawable(icon);
		}

		if (title != null) {
			text.setText(title);
		}

		if (listener != null) {
			container.setOnClickListener(listener);
		}

		return container;
	}

	/**
	 * 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);
    }
}