Android Open Source - Android-Lib-ContextMenu Context Menu

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License

The source code is released under:

Apache License

Java Source Code

package android.lib.contextmenu;
/*from  w  w w. jav  a2  s  .  co  m*/
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.util.DisplayMetrics;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.MenuItem.OnMenuItemClickListener;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.PopupWindow;

public class ContextMenu {
    private final Context  context;
    private final View     container;
    private final ListView listView;

    private MenuItemAdapter         adapter;
    private OnMenuItemClickListener listener;

    private Drawable belowBackground;
    private Drawable aboveBackground;

    private PopupWindow popupWindow;
    private final Handler     handler = new Handler();

    public ContextMenu(final Context context) {
        this.context   = context;
        this.container = View.inflate(context, R.layout.popup_menu, null);
        this.listView  = (ListView)this.container.findViewById(android.R.id.list);

        this.listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(final AdapterView<?> parent, final View view, final int position, final long id) {
                ContextMenu.this.close();

                if (ContextMenu.this.listener != null) {
                    ContextMenu.this.listener.onMenuItemClick((MenuItem)ContextMenu.this.adapter.getItem(position));
                }
            }
        });
    }

    /**
     * Indicate whether this pop-up menu is showing on screen.
     * @return <code>true</code> if this pop-up menu is showing on screen; otherwise, <code>false</code>.
     */
    public boolean isShowing() {
        return this.popupWindow.isShowing();
    }

    /**
     * Sets the background drawables for this pop-up menu.
     * @param belowBackground the background drawable to be used for showing this pop-up menu below the anchor view.
     * @param aboveBackground the background drawable to be used for showing this pop-up menu above the anchor view.
     * @return this pop-up menu.
     */
    public ContextMenu setBackground(final Drawable belowBackground, final Drawable aboveBackground) {
        this.belowBackground = belowBackground;
        this.aboveBackground = aboveBackground;

        return this;
    }

    /**
     * Sets the background drawables for this pop-up menu.
     * @param belowBackground the background drawable to be used for showing this pop-up menu below the anchor view.
     * @param aboveBackground the background drawable to be used for showing this pop-up menu above the anchor view.
     * @return this pop-up menu.
     */
    public ContextMenu setBackground(final int belowBackground, final int aboveBackground) {
        return this.setBackground(this.context.getResources().getDrawable(belowBackground), this.context.getResources().getDrawable(aboveBackground));
    }

    /**
     * Sets the callback when a menu item is clicked.
     * @param listener a callback when a menu item is clicked.
     * @return this pop-up menu.
     */
    public ContextMenu setOnMenuItemClickListener(final OnMenuItemClickListener listener) {
        this.listener = listener;

        return this;
    }

    /**
     * Cleans up any resources used by {@link ContextMenu}.
     * <p>Applications that uses {@link ContextMenu} must call {@link #onPause()} in its
     * {@link android.app.Activity#onPause()} to closes any pop-up menu that is visible. It is safe
     * to call {@link #onPause()} even if it is not visible.</p>
     */
    public void onPause() {
        this.close();
    }

    /**
     * Closes the pop-up menu if it is visible.
     */
    public void close() {
        if (this.popupWindow != null) {
            this.popupWindow.dismiss();
        }
    }

    /**
     * Shows the pop-up menu below/above the given anchor view.
     * <p>The pop-up menu will be shown below the given anchor view if the bottom of the anchor view
     * is below the half-way of the screen; otherwise, it will be shown above the anchor view.</p>
     */
    public void show(final View anchor, final int menuRes, final int width, final int duration) {
        this.close();

        this.popupWindow = new PopupWindow(this.container, width, 0, true);
        this.popupWindow.setOutsideTouchable(true);
        this.popupWindow.setWindowLayoutMode(0, ViewGroup.LayoutParams.WRAP_CONTENT);

        final DisplayMetrics metrics = new DisplayMetrics();
        ((WindowManager)this.context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getMetrics(metrics);

        final int[] coordinates = new int[2];
        anchor.getLocationOnScreen(coordinates);

        final Menu menu = new MockMenu(this.context);
        new MenuInflater(this.context).inflate(menuRes, menu);

        this.adapter = new MenuItemAdapter(this.context, menu);
        this.listView.setAdapter(this.adapter);

        this.popupWindow.update();

        if (coordinates[1] + anchor.getHeight() > metrics.heightPixels / 2) {
            this.popupWindow.setBackgroundDrawable(this.aboveBackground);
            this.popupWindow.showAsDropDown(anchor, 0, -anchor.getHeight());
        } else {
            this.popupWindow.setBackgroundDrawable(this.belowBackground);
            this.popupWindow.showAsDropDown(anchor);
        }

        if (duration > 0) {
            this.handler.postDelayed(new Runnable() {
                @Override
                public void run() {
                    ContextMenu.this.close();
                }
            }, duration);
        }
    }
}

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