Example usage for android.support.v4.widget ExploreByTouchHelper ExploreByTouchHelper

Introduction

In this page you can find the example usage for android.support.v4.widget ExploreByTouchHelper ExploreByTouchHelper.

Prototype

public ExploreByTouchHelper(View view) 

Source Link

Usage

From source file:org.connectbot.views.CheckableMenuItem.java

public CheckableMenuItem(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);

    mRootView = inflate(context, R.layout.view_checkablemenuitem, this);

    mTitle = (TextView) mRootView.findViewById(R.id.title);
    mSummary = (TextView) mRootView.findViewById(R.id.summary);
    mSwitch = (SwitchCompat) findViewById(R.id.checkbox_switch);

    setFocusable(true);/*from w w w .  j  av a2  s .  c o m*/

    mAccessHelper = new ExploreByTouchHelper(this) {
        private final Rect mTmpRect = new Rect();

        @Override
        protected int getVirtualViewAt(float x, float y) {
            return HOST_ID;
        }

        @Override
        protected void getVisibleVirtualViews(List<Integer> virtualViewIds) {
        }

        @Override
        protected void onPopulateEventForVirtualView(int virtualViewId, AccessibilityEvent event) {
            if (virtualViewId != HOST_ID) {
                // TODO(kroot): remove this when the bug is fixed.
                event.setContentDescription(PLACEHOLDER_STRING);
                return;
            }

            event.setContentDescription(mTitle.getText() + " " + mSummary.getText());
            event.setClassName(ACCESSIBILITY_EVENT_CLASS_NAME);
            event.setChecked(isChecked());
        }

        @Override
        protected void onPopulateNodeForVirtualView(int virtualViewId, AccessibilityNodeInfoCompat node) {
            if (virtualViewId != HOST_ID) {
                // TODO(kroot): remove this when the bug is fixed.
                node.setBoundsInParent(mPlaceHolderRect);
                node.setContentDescription(PLACEHOLDER_STRING);
                return;
            }

            mTmpRect.set(0, 0, CheckableMenuItem.this.getWidth(), CheckableMenuItem.this.getHeight());
            node.setBoundsInParent(mTmpRect);

            node.addAction(AccessibilityNodeInfoCompat.ACTION_CLICK);
            node.setClassName(ACCESSIBILITY_EVENT_CLASS_NAME);
            node.setCheckable(true);
            node.setChecked(isChecked());

            node.addChild(mTitle);
            node.addChild(mSummary);
        }

        @Override
        protected boolean onPerformActionForVirtualView(int virtualViewId, int action, Bundle arguments) {
            if (virtualViewId != HOST_ID) {
                return false;
            }

            if (action == AccessibilityNodeInfoCompat.ACTION_CLICK) {
                mSwitch.toggle();
                sendAccessibilityEvent(mRootView, AccessibilityEventCompat.CONTENT_CHANGE_TYPE_UNDEFINED);
                return true;
            }

            return false;
        }
    };
    ViewCompat.setAccessibilityDelegate(mRootView, mAccessHelper);

    setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            mSwitch.toggle();
        }
    });

    if (attrs != null) {
        TypedArray typedArray = getContext().obtainStyledAttributes(attrs, R.styleable.CheckableMenuItem, 0, 0);

        @DrawableRes
        int iconRes = typedArray.getResourceId(R.styleable.CheckableMenuItem_android_icon, 0);
        @StringRes
        int titleRes = typedArray.getResourceId(R.styleable.CheckableMenuItem_android_title, 0);
        @StringRes
        int summaryRes = typedArray.getResourceId(R.styleable.CheckableMenuItem_summary, 0);

        typedArray.recycle();

        ImageView icon = (ImageView) mRootView.findViewById(R.id.icon);
        mTitle.setText(titleRes);
        if (iconRes != 0) {
            Resources resources = context.getResources();
            Resources.Theme theme = context.getTheme();
            Drawable iconDrawable = VectorDrawableCompat.create(resources, iconRes, theme);

            icon.setImageDrawable(iconDrawable);
        }
        if (summaryRes != 0) {
            mSummary.setText(summaryRes);
        }
    }
}

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