Make it easier to click on phone nav buttons
When touches fall through the normal click targets, redirect them
to the nearest view.
Test: runtest systemui
Change-Id: I48267d9b1e15bf8dbe8725b72326751b03196efa
Fixes: 64080938
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NearestTouchFrame.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NearestTouchFrame.java
new file mode 100644
index 0000000..8bc6563
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NearestTouchFrame.java
@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2017 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.systemui.statusbar.phone;
+
+import android.content.Context;
+import android.graphics.Rect;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.util.Pair;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.FrameLayout;
+
+import com.android.systemui.R;
+
+import java.util.ArrayList;
+import java.util.Comparator;
+
+/**
+ * Redirects touches that aren't handled by any child view to the nearest
+ * clickable child. Only takes effect on <sw600dp.
+ */
+public class NearestTouchFrame extends FrameLayout {
+
+ private final ArrayList<View> mClickableChildren = new ArrayList<>();
+ private final boolean mIsActive;
+ private final int[] mTmpInt = new int[2];
+ private final int[] mOffset = new int[2];
+ private View mTouchingChild;
+
+ public NearestTouchFrame(Context context, AttributeSet attrs) {
+ super(context, attrs);
+ mIsActive = context.getResources().getConfiguration().smallestScreenWidthDp < 600;
+ }
+
+ @Override
+ protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+ super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+ mClickableChildren.clear();
+ addClickableChildren(this);
+ }
+
+ @Override
+ protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
+ super.onLayout(changed, left, top, right, bottom);
+ getLocationInWindow(mOffset);
+ }
+
+ private void addClickableChildren(ViewGroup group) {
+ final int N = group.getChildCount();
+ for (int i = 0; i < N; i++) {
+ View child = group.getChildAt(i);
+ if (child.isClickable()) {
+ mClickableChildren.add(child);
+ } else if (child instanceof ViewGroup) {
+ addClickableChildren((ViewGroup) child);
+ }
+ }
+ }
+
+ @Override
+ public boolean onTouchEvent(MotionEvent event) {
+ if (mIsActive) {
+ if (event.getAction() == MotionEvent.ACTION_DOWN) {
+ mTouchingChild = findNearestChild(event);
+ }
+ if (mTouchingChild != null) {
+ event.offsetLocation(mTouchingChild.getWidth() / 2 - event.getX(),
+ mTouchingChild.getHeight() / 2 - event.getY());
+ return mTouchingChild.dispatchTouchEvent(event);
+ }
+ }
+ return super.onTouchEvent(event);
+ }
+
+ private View findNearestChild(MotionEvent event) {
+ return mClickableChildren.stream().map(v -> new Pair<>(distance(v, event), v))
+ .min(Comparator.comparingInt(f -> f.first)).get().second;
+ }
+
+ private int distance(View v, MotionEvent event) {
+ v.getLocationInWindow(mTmpInt);
+ int left = mTmpInt[0] - mOffset[0];
+ int top = mTmpInt[1] - mOffset[1];
+ int right = left + v.getWidth();
+ int bottom = top + v.getHeight();
+
+ int x = Math.min(Math.abs(left - (int) event.getX()),
+ Math.abs((int) event.getX() - right));
+ int y = Math.min(Math.abs(top - (int) event.getY()),
+ Math.abs((int) event.getY() - bottom));
+
+ return Math.max(x, y);
+ }
+}