From bd6347ddda0a233607fe14afb44449d925c4715a Mon Sep 17 00:00:00 2001
From: agnostic-apollo <agnosticapollo@gmail.com>
Date: Thu, 16 Jun 2022 18:31:08 +0500
Subject: [PATCH] Added: Add support for sending terminal cursor position to
 accessibility apps like brltty

---
 .../java/com/termux/view/TerminalView.java    |  9 ++++-
 .../TerminalAccessibilityDelegate.java        | 39 +++++++++++++++++++
 2 files changed, 46 insertions(+), 2 deletions(-)
 create mode 100644 terminal-view/src/main/java/com/termux/view/accessibility/TerminalAccessibilityDelegate.java

diff --git a/terminal-view/src/main/java/com/termux/view/TerminalView.java b/terminal-view/src/main/java/com/termux/view/TerminalView.java
index 2bed7cab..0e081bd1 100644
--- a/terminal-view/src/main/java/com/termux/view/TerminalView.java
+++ b/terminal-view/src/main/java/com/termux/view/TerminalView.java
@@ -23,6 +23,7 @@ import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewConfiguration;
 import android.view.ViewTreeObserver;
+import android.view.accessibility.AccessibilityEvent;
 import android.view.accessibility.AccessibilityManager;
 import android.view.autofill.AutofillValue;
 import android.view.inputmethod.BaseInputConnection;
@@ -35,6 +36,7 @@ import androidx.annotation.RequiresApi;
 import com.termux.terminal.KeyHandler;
 import com.termux.terminal.TerminalEmulator;
 import com.termux.terminal.TerminalSession;
+import com.termux.view.accessibility.TerminalAccessibilityDelegate;
 import com.termux.view.textselection.TextSelectionCursorController;
 
 /** View displaying and interacting with a {@link TerminalSession}. */
@@ -217,6 +219,7 @@ public final class TerminalView extends View {
         mScroller = new Scroller(context);
         AccessibilityManager am = (AccessibilityManager) context.getSystemService(Context.ACCESSIBILITY_SERVICE);
         mAccessibilityEnabled = am.isEnabled();
+        setAccessibilityDelegate(new TerminalAccessibilityDelegate(this));
     }
 
 
@@ -443,7 +446,9 @@ public final class TerminalView extends View {
         mEmulator.clearScrollCounter();
 
         invalidate();
-        if (mAccessibilityEnabled) setContentDescription(getText());
+
+        if (mAccessibilityEnabled)
+            sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED);
     }
 
     /**
@@ -938,7 +943,7 @@ public final class TerminalView extends View {
         return mTermSession;
     }
 
-    private CharSequence getText() {
+    public CharSequence getText() {
         return mEmulator.getScreen().getSelectedText(0, mTopRow, mEmulator.mColumns, mTopRow + mEmulator.mRows);
     }
 
diff --git a/terminal-view/src/main/java/com/termux/view/accessibility/TerminalAccessibilityDelegate.java b/terminal-view/src/main/java/com/termux/view/accessibility/TerminalAccessibilityDelegate.java
new file mode 100644
index 00000000..4ad3a326
--- /dev/null
+++ b/terminal-view/src/main/java/com/termux/view/accessibility/TerminalAccessibilityDelegate.java
@@ -0,0 +1,39 @@
+package com.termux.view.accessibility;
+
+import android.os.Bundle;
+import android.view.View;
+import android.view.accessibility.AccessibilityNodeInfo;
+
+import androidx.annotation.NonNull;
+
+import com.termux.view.TerminalView;
+
+public class TerminalAccessibilityDelegate extends View.AccessibilityDelegate {
+
+    private static final String LOG_TAG = "TerminalAccessibilityDelegate";
+
+    public static String EXTRA_ACCESSIBILITY_NODE_TYPE = "accessibility-node-type";
+    public static String EXTRA_TERMINAL_CURSOR_COL = "terminal-cursor-col";
+    public static String EXTRA_TERMINAL_CURSOR_ROW = "terminal-cursor-row";
+
+    private final TerminalView mTerminalView;
+
+    public TerminalAccessibilityDelegate(@NonNull TerminalView terminalView) {
+        mTerminalView = terminalView;
+    }
+
+    @Override
+    public void onInitializeAccessibilityNodeInfo(@NonNull View host, @NonNull AccessibilityNodeInfo info) {
+        mTerminalView.mClient.logInfo(LOG_TAG, "onInitializeAccessibilityNodeInfo");
+        super.onInitializeAccessibilityNodeInfo(host, info);
+        Bundle extra = info.getExtras();
+        if (mTerminalView.mEmulator != null) {
+            extra.putString(EXTRA_ACCESSIBILITY_NODE_TYPE, "terminal");
+            extra.putInt(EXTRA_TERMINAL_CURSOR_COL, mTerminalView.mEmulator.getCursorCol());
+            extra.putInt(EXTRA_TERMINAL_CURSOR_ROW, mTerminalView.mEmulator.getCursorRow());
+            mTerminalView.mClient.logInfo(LOG_TAG, "col=" + mTerminalView.mEmulator.getCursorCol() + ", row=" + mTerminalView.mEmulator.getCursorRow());
+        }
+
+        info.setContentDescription(mTerminalView.getText());
+    }
+}