1 files changed, 169 insertions, 0 deletions
diff --git a/src/com/android/settings/widget/LinkAccessibilityHelper.java b/src/com/android/settings/widget/LinkAccessibilityHelper.java
new file mode 100644
index 000000000..2d4d585f9
--- /dev/null
+++ b/src/com/android/settings/widget/LinkAccessibilityHelper.java
@@ -0,0 +1,169 @@
+/*
+ * Copyright (C) 2014 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.settings.widget;
+
+import android.graphics.Rect;
+import android.os.Bundle;
+import android.text.Layout;
+import android.text.Spanned;
+import android.text.style.ClickableSpan;
+import android.util.Log;
+import android.view.accessibility.AccessibilityEvent;
+import android.view.accessibility.AccessibilityNodeInfo;
+import android.widget.TextView;
+
+import java.util.List;
+
+/**
+ * Copied from setup wizard.
+ */
+public class LinkAccessibilityHelper extends ExploreByTouchHelper {
+
+    private static final String TAG = "LinkAccessibilityHelper";
+
+    private final TextView mView;
+    private final Rect mTempRect = new Rect();
+
+    public LinkAccessibilityHelper(TextView view) {
+        super(view);
+        mView = view;
+    }
+
+    @Override
+    protected int getVirtualViewAt(float x, float y) {
+        final CharSequence text = mView.getText();
+        if (text instanceof Spanned) {
+            final Spanned spannedText = (Spanned) text;
+            final int offset = mView.getOffsetForPosition(x, y);
+            ClickableSpan[] linkSpans = spannedText.getSpans(offset, offset, ClickableSpan.class);
+            if (linkSpans.length == 1) {
+                ClickableSpan linkSpan = linkSpans[0];
+                return spannedText.getSpanStart(linkSpan);
+            }
+        }
+        return INVALID_ID;
+    }
+
+    @Override
+    protected void getVisibleVirtualViews(List<Integer> virtualViewIds) {
+        final CharSequence text = mView.getText();
+        if (text instanceof Spanned) {
+            final Spanned spannedText = (Spanned) text;
+            ClickableSpan[] linkSpans = spannedText.getSpans(0, spannedText.length(),
+                    ClickableSpan.class);
+            for (ClickableSpan span : linkSpans) {
+                virtualViewIds.add(spannedText.getSpanStart(span));
+            }
+        }
+    }
+
+    @Override
+    protected void onPopulateEventForVirtualView(int virtualViewId, AccessibilityEvent event) {
+        final ClickableSpan span = getSpanForOffset(virtualViewId);
+        if (span != null) {
+            event.setContentDescription(getTextForSpan(span));
+        } else {
+            Log.e(TAG, "ClickableSpan is null for offset: " + virtualViewId);
+            event.setContentDescription(mView.getText());
+        }
+    }
+
+    @Override
+    protected void onPopulateNodeForVirtualView(int virtualViewId, AccessibilityNodeInfo info) {
+        final ClickableSpan span = getSpanForOffset(virtualViewId);
+        if (span != null) {
+            info.setContentDescription(getTextForSpan(span));
+        } else {
+            Log.e(TAG, "ClickableSpan is null for offset: " + virtualViewId);
+            info.setContentDescription(mView.getText());
+        }
+        info.setFocusable(true);
+        info.setClickable(true);
+        getBoundsForSpan(span, mTempRect);
+        if (!mTempRect.isEmpty()) {
+            info.setBoundsInParent(getBoundsForSpan(span, mTempRect));
+        } else {
+            Log.e(TAG, "LinkSpan bounds is empty for: " + virtualViewId);
+            mTempRect.set(0, 0, 1, 1);
+            info.setBoundsInParent(mTempRect);
+        }
+        info.addAction(AccessibilityNodeInfo.ACTION_CLICK);
+    }
+
+    @Override
+    protected boolean onPerformActionForVirtualView(int virtualViewId, int action,
+            Bundle arguments) {
+        if (action == AccessibilityNodeInfo.ACTION_CLICK) {
+            ClickableSpan span = getSpanForOffset(virtualViewId);
+            if (span != null) {
+                span.onClick(mView);
+                return true;
+            } else {
+                Log.e(TAG, "LinkSpan is null for offset: " + virtualViewId);
+            }
+        }
+        return false;
+    }
+
+    private ClickableSpan getSpanForOffset(int offset) {
+        CharSequence text = mView.getText();
+        if (text instanceof Spanned) {
+            Spanned spannedText = (Spanned) text;
+            ClickableSpan[] spans = spannedText.getSpans(offset, offset, ClickableSpan.class);
+            if (spans.length == 1) {
+                return spans[0];
+            }
+        }
+        return null;
+    }
+
+    private CharSequence getTextForSpan(ClickableSpan span) {
+        CharSequence text = mView.getText();
+        if (text instanceof Spanned) {
+            Spanned spannedText = (Spanned) text;
+            return spannedText.subSequence(spannedText.getSpanStart(span),
+                    spannedText.getSpanEnd(span));
+        }
+        return text;
+    }
+
+    // Find the bounds of a span. If it spans multiple lines, it will only return the bounds for the
+    // section on the first line.
+    private Rect getBoundsForSpan(ClickableSpan span, Rect outRect) {
+        CharSequence text = mView.getText();
+        outRect.setEmpty();
+        if (text instanceof Spanned) {
+            Spanned spannedText = (Spanned) text;
+            final int spanStart = spannedText.getSpanStart(span);
+            final int spanEnd = spannedText.getSpanEnd(span);
+            final Layout layout = mView.getLayout();
+            final float xStart = layout.getPrimaryHorizontal(spanStart);
+            final float xEnd = layout.getPrimaryHorizontal(spanEnd);
+            final int lineStart = layout.getLineForOffset(spanStart);
+            final int lineEnd = layout.getLineForOffset(spanEnd);
+            layout.getLineBounds(lineStart, outRect);
+            outRect.left = (int) xStart;
+            if (lineEnd == lineStart) {
+                outRect.right = (int) xEnd;
+            } // otherwise just leave it at the end of the start line
+
+            // Offset for padding
+            outRect.offset(mView.getTotalPaddingLeft(), mView.getTotalPaddingTop());
+        }
+        return outRect;
+    }
+}