Lawnchair/src/com/android/launcher3/LauncherAppWidgetHostView.java

/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.launcher3;

import android.appwidget.AppWidgetHostView;
import android.appwidget.AppWidgetProviderInfo;
import android.content.Context;
import android.graphics.Rect;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewDebug;
import android.view.ViewGroup;
import android.view.accessibility.AccessibilityNodeInfo;
import android.widget.RemoteViews;

import com.android.launcher3.dragndrop.DragLayer;
import com.android.launcher3.dragndrop.DragLayer.TouchCompleteListener;

import java.util.ArrayList;

/**
 * {@inheritDoc}
 */
public class LauncherAppWidgetHostView extends AppWidgetHostView implements TouchCompleteListener {

    LayoutInflater mInflater;

    private CheckLongPressHelper mLongPressHelper;
    private StylusEventHelper mStylusEventHelper;
    private Context mContext;
    @ViewDebug.ExportedProperty(category = "launcher")
    private int mPreviousOrientation;
    private DragLayer mDragLayer;

    private float mSlop;

    @ViewDebug.ExportedProperty(category = "launcher")
    private boolean mChildrenFocused;

    protected int mErrorViewId = R.layout.appwidget_error;

    public LauncherAppWidgetHostView(Context context) {
        super(context);
        mContext = context;
        mLongPressHelper = new CheckLongPressHelper(this);
        mStylusEventHelper = new StylusEventHelper(new SimpleOnStylusPressListener(this), this);
        mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        mDragLayer = ((Launcher) context).getDragLayer();
        setAccessibilityDelegate(LauncherAppState.getInstance().getAccessibilityDelegate());

        setBackgroundResource(R.drawable.widget_internal_focus_bg);
    }

    @Override
    protected View getErrorView() {
        return mInflater.inflate(mErrorViewId, this, false);
    }

    public void updateLastInflationOrientation() {
        mPreviousOrientation = mContext.getResources().getConfiguration().orientation;
    }

    @Override
    public void updateAppWidget(RemoteViews remoteViews) {
        // Store the orientation in which the widget was inflated
        updateLastInflationOrientation();
        super.updateAppWidget(remoteViews);
    }

    public boolean isReinflateRequired() {
        // Re-inflate is required if the orientation has changed since last inflated.
        int orientation = mContext.getResources().getConfiguration().orientation;
        if (mPreviousOrientation != orientation) {
           return true;
       }
       return false;
    }

    public boolean onInterceptTouchEvent(MotionEvent ev) {
        // Just in case the previous long press hasn't been cleared, we make sure to start fresh
        // on touch down.
        if (ev.getAction() == MotionEvent.ACTION_DOWN) {
            mLongPressHelper.cancelLongPress();
        }

        // Consume any touch events for ourselves after longpress is triggered
        if (mLongPressHelper.hasPerformedLongPress()) {
            mLongPressHelper.cancelLongPress();
            return true;
        }

        // Watch for longpress or stylus button press events at this level to
        // make sure users can always pick up this widget
        if (mStylusEventHelper.onMotionEvent(ev)) {
            mLongPressHelper.cancelLongPress();
            return true;
        }
        switch (ev.getAction()) {
            case MotionEvent.ACTION_DOWN: {
                if (!mStylusEventHelper.inStylusButtonPressed()) {
                    mLongPressHelper.postCheckForLongPress();
                }
                mDragLayer.setTouchCompleteListener(this);
                break;
            }

            case MotionEvent.ACTION_UP:
            case MotionEvent.ACTION_CANCEL:
                mLongPressHelper.cancelLongPress();
                break;
            case MotionEvent.ACTION_MOVE:
                if (!Utilities.pointInView(this, ev.getX(), ev.getY(), mSlop)) {
                    mLongPressHelper.cancelLongPress();
                }
                break;
        }

        // Otherwise continue letting touch events fall through to children
        return false;
    }

    public boolean onTouchEvent(MotionEvent ev) {
        // If the widget does not handle touch, then cancel
        // long press when we release the touch
        switch (ev.getAction()) {
            case MotionEvent.ACTION_UP:
            case MotionEvent.ACTION_CANCEL:
                mLongPressHelper.cancelLongPress();
                break;
            case MotionEvent.ACTION_MOVE:
                if (!Utilities.pointInView(this, ev.getX(), ev.getY(), mSlop)) {
                    mLongPressHelper.cancelLongPress();
                }
                break;
        }
        return false;
    }

    @Override
    protected void onAttachedToWindow() {
        super.onAttachedToWindow();
        mSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop();
    }

    @Override
    public void cancelLongPress() {
        super.cancelLongPress();
        mLongPressHelper.cancelLongPress();
    }

    @Override
    public AppWidgetProviderInfo getAppWidgetInfo() {
        AppWidgetProviderInfo info = super.getAppWidgetInfo();
        if (info != null && !(info instanceof LauncherAppWidgetProviderInfo)) {
            throw new IllegalStateException("Launcher widget must have"
                    + " LauncherAppWidgetProviderInfo");
        }
        return info;
    }

    public LauncherAppWidgetProviderInfo getLauncherAppWidgetProviderInfo() {
        return (LauncherAppWidgetProviderInfo) getAppWidgetInfo();
    }

    @Override
    public void onTouchComplete() {
        if (!mLongPressHelper.hasPerformedLongPress()) {
            // If a long press has been performed, we don't want to clear the record of that since
            // we still may be receiving a touch up which we want to intercept
            mLongPressHelper.cancelLongPress();
        }
    }

    @Override
    public int getDescendantFocusability() {
        return mChildrenFocused ? ViewGroup.FOCUS_BEFORE_DESCENDANTS
                : ViewGroup.FOCUS_BLOCK_DESCENDANTS;
    }

    @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
        if (mChildrenFocused && event.getKeyCode() == KeyEvent.KEYCODE_ESCAPE
                && event.getAction() == KeyEvent.ACTION_UP) {
            mChildrenFocused = false;
            requestFocus();
            return true;
        }
        return super.dispatchKeyEvent(event);
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (!mChildrenFocused && keyCode == KeyEvent.KEYCODE_ENTER) {
            event.startTracking();
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event) {
        if (event.isTracking()) {
            if (!mChildrenFocused && keyCode == KeyEvent.KEYCODE_ENTER) {
                mChildrenFocused = true;
                ArrayList<View> focusableChildren = getFocusables(FOCUS_FORWARD);
                focusableChildren.remove(this);
                int childrenCount = focusableChildren.size();
                switch (childrenCount) {
                    case 0:
                        mChildrenFocused = false;
                        break;
                    case 1: {
                        if (getTag() instanceof ItemInfo) {
                            ItemInfo item = (ItemInfo) getTag();
                            if (item.spanX == 1 && item.spanY == 1) {
                                focusableChildren.get(0).performClick();
                                mChildrenFocused = false;
                                return true;
                            }
                        }
                        // continue;
                    }
                    default:
                        focusableChildren.get(0).requestFocus();
                        return true;
                }
            }
        }
        return super.onKeyUp(keyCode, event);
    }

    @Override
    protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) {
        if (gainFocus) {
            mChildrenFocused = false;
            dispatchChildFocus(false);
        }
        super.onFocusChanged(gainFocus, direction, previouslyFocusedRect);
    }

    @Override
    public void requestChildFocus(View child, View focused) {
        super.requestChildFocus(child, focused);
        dispatchChildFocus(mChildrenFocused && focused != null);
        if (focused != null) {
            focused.setFocusableInTouchMode(false);
        }
    }

    @Override
    public void clearChildFocus(View child) {
        super.clearChildFocus(child);
        dispatchChildFocus(false);
    }

    @Override
    public boolean dispatchUnhandledMove(View focused, int direction) {
        return mChildrenFocused;
    }

    private void dispatchChildFocus(boolean childIsFocused) {
        // The host view's background changes when selected, to indicate the focus is inside.
        setSelected(childIsFocused);
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        try {
            super.onLayout(changed, left, top, right, bottom);
        } catch (final RuntimeException e) {
            post(new Runnable() {
                @Override
                public void run() {
                    // Update the widget with 0 Layout id, to reset the view to error view.
                    updateAppWidget(new RemoteViews(getAppWidgetInfo().provider.getPackageName(), 0));
                }
            });
        }
    }

    @Override
    public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
        super.onInitializeAccessibilityNodeInfo(info);
        info.setClassName(getClass().getName());
    }
}