Merge "Implement lift-to-type for phone dialer accessibility." into jb-mr1-dev

package com.android.contacts.dialpad;

import android.content.Context;

import android.graphics.Rect;

import android.util.AttributeSet;

import android.view.MotionEvent;

import android.view.View;

import android.view.accessibility.AccessibilityManager;

import android.widget.ImageButton;

/**

 * Custom {@link ImageButton} for dialpad buttons.

 *

 * During horizontal swipe, we want to exit "fading out" animation offered by its background

 * just after starting the swipe.This class overrides {@link #onTouchEvent(MotionEvent)} to achieve

 * the behavior.

 * <p>

 * This class implements lift-to-type interaction when touch exploration is

 * enabled.

 */

public class DialpadImageButton extends ImageButton {

    /** Accessibility manager instance used to check touch exploration state. */

    private AccessibilityManager mAccessibilityManager;

    /** Bounds used to filter HOVER_EXIT events. */

    private Rect mHoverBounds = new Rect();

    public interface OnPressedListener {

        public void onPressed(View view, boolean pressed);

    }

    public DialpadImageButton(Context context, AttributeSet attrs) {

        super(context, attrs);

        initForAccessibility(context);

    }

    public DialpadImageButton(Context context, AttributeSet attrs, int defStyle) {

        super(context, attrs, defStyle);

        initForAccessibility(context);

    }

    private void initForAccessibility(Context context) {

        mAccessibilityManager = (AccessibilityManager) context.getSystemService(

                Context.ACCESSIBILITY_SERVICE);

    }

    @Override

            mOnPressedListener.onPressed(this, pressed);

        }

    }

    @Override

    public void onSizeChanged(int w, int h, int oldw, int oldh) {

        super.onSizeChanged(w, h, oldw, oldh);

        mHoverBounds.left = getPaddingLeft();

        mHoverBounds.right = w - getPaddingRight();

        mHoverBounds.top = getPaddingTop();

        mHoverBounds.bottom = h - getPaddingBottom();

    }

    @Override

    public boolean performClick() {

        // When accessibility is on, simulate press and release to preserve the

        // semantic meaning of performClick(). Required for Braille support.

        if (mAccessibilityManager.isEnabled()) {

            // Checking the press state prevents double activation.

            if (!isPressed()) {

                setPressed(true);

                setPressed(false);

            }

            return true;

        }

        return super.performClick();

    }

    @Override

    public boolean onHoverEvent(MotionEvent event) {

        // When touch exploration is turned on, lifting a finger while inside

        // the button's hover target bounds should perform a click action.

        if (mAccessibilityManager.isEnabled()

                && mAccessibilityManager.isTouchExplorationEnabled()) {

            switch (event.getActionMasked()) {

                case MotionEvent.ACTION_HOVER_ENTER:

                    // Lift-to-type temporarily disables double-tap activation.

                    setClickable(false);

                    break;

                case MotionEvent.ACTION_HOVER_EXIT:

                    if (mHoverBounds.contains((int) event.getX(), (int) event.getY())) {

                        performClick();

                    }

                    setClickable(true);

                    break;

            }

        }

        return super.onHoverEvent(event);

    }

}