nextcloud-android/src/eu/alefzero/owncloud/QuickAction.java

package eu.alefzero.owncloud;

import android.content.Context;

import android.graphics.Rect;
import android.graphics.drawable.Drawable;

import android.widget.ImageView;
import android.widget.TextView;
import android.widget.LinearLayout;
import android.widget.ScrollView;

import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.view.ViewGroup;

import java.util.ArrayList;

/**
 * Popup window, shows action list as icon and text like the one in Gallery3D app. 
 * 
 * @author Lorensius. W. T
 */
public class QuickAction extends CustomPopup {
	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 ViewGroup mTrack;
	private ScrollView scroller;
	private 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		= (ViewGroup) 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];
	
		mAnchor.getLocationOnScreen(location);

		Rect anchorRect 	= new Rect(location[0], location[1], location[0] + mAnchor.getWidth(), location[1] 
		                	+ mAnchor.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 	= mWManager.getDefaultDisplay().getWidth();
		int screenHeight	= mWManager.getDefaultDisplay().getHeight();
		
		//automatically get X coord of popup (top left)
		if ((anchorRect.left + rootWidth) > screenWidth) {
			xPos = anchorRect.left - (rootWidth-mAnchor.getWidth());
		} else {
			if (mAnchor.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 	= scroller.getLayoutParams();
				l.height		= dyTop - mAnchor.getHeight();
			} else {
				yPos = anchorRect.top - rootHeight;
			}
		} else {
			yPos = anchorRect.bottom;
			
			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);
		
		mWindow.showAtLocation(mAnchor, 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:
			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;
		}
	}
	
	/**
	 * 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).getOnClickListerner();
	
			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);
    }
}