Add support for static cursor

app/src/main/java/net/gsantner/markor/activity/DocumentEditAndViewFragment.java

@@ -159,7 +159,7 @@ public void onViewCreated(@NonNull View view, Bundle savedInstanceState) {
             return;
         }
 
-        _lineNumbersView.setup(_hlEditor);
+        _lineNumbersView.setEditText(_hlEditor);
         _lineNumbersView.setLineNumbersEnabled(_appSettings.getDocumentLineNumbersEnabled(_document.path));
 
         // Upon construction, the document format has been determined from extension etc
@@ -191,6 +191,7 @@ public void onViewCreated(@NonNull View view, Bundle savedInstanceState) {
         _hlEditor.setAutoFormatEnabled(_appSettings.getDocumentAutoFormatEnabled(_document.path));
         _hlEditor.setSaveInstanceState(false); // We will reload from disk
         _hlEditor.setOverScrollMode(View.OVER_SCROLL_ALWAYS);
+        _hlEditor.setStaticCursorEnabled(_appSettings.isStaticCursorEnabled());
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
             // Do not need to send contents to accessibility
             _hlEditor.setImportantForAccessibility(View.IMPORTANT_FOR_AUTOFILL_NO_EXCLUDE_DESCENDANTS);

app/src/main/java/net/gsantner/markor/frontend/textview/HighlightingEditor.java

@@ -18,20 +18,24 @@
 import android.text.Layout;
 import android.text.TextWatcher;
 import android.util.AttributeSet;
+import android.util.DisplayMetrics;
 import android.util.Log;
+import android.util.TypedValue;
 import android.view.ActionMode;
 import android.view.KeyEvent;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewTreeObserver;
 import android.view.accessibility.AccessibilityEvent;
+import android.widget.EditText;
 import android.widget.Toast;
 
 import androidx.annotation.ColorInt;
 import androidx.annotation.NonNull;
 import androidx.annotation.RequiresApi;
 import androidx.appcompat.widget.AppCompatEditText;
+import androidx.core.content.ContextCompat;
 
 import net.gsantner.markor.R;
 import net.gsantner.markor.activity.MainActivity;
@@ -74,6 +78,7 @@ public class HighlightingEditor extends AppCompatEditText {
     private final AtomicBoolean _textUnchangedWhileHighlighting = new AtomicBoolean(true);
     private int _textChangedNumber;
     private final Runnable _textChangedRecorder = TextViewUtils.makeDebounced(getHandler(), 1000, () -> _textChangedNumber++);
+    private StaticCursorDrawer _staticCursorDrawer;
 
     public HighlightingEditor(Context context, AttributeSet attrs) {
         super(context, attrs);
@@ -122,32 +127,12 @@ public void afterTextChanged(final Editable s) {
         setupCustomOptions();
     }
 
-    @Override
-    public boolean onPreDraw() {
-        try {
-            return super.onPreDraw();
-        } catch (OutOfMemoryError ignored) {
-            return false; // return false to cancel current drawing pass/round
-        }
-    }
-
-    @Override
-    protected void onDraw(Canvas canvas) {
-        try {
-            super.onDraw(canvas);
-        } catch (Exception e) {
-            // Hinder drawing from crashing the app
-            Log.e(getClass().getName(), "HighlightingEdtior onDraw->super.onDraw crash" + e);
-            Toast.makeText(getContext(), e.toString(), Toast.LENGTH_SHORT).show();
-        }
-    }
-
     // Highlighting
     // ---------------------------------------------------------------------------------------------
 
     // Batch edit spans (or anything else, really)
     // This triggers a reflow which will bring focus back to the cursor.
-    // Therefore it cannot be used for updating the highlighting as one scrolls
+    // Therefore, it cannot be used for updating the highlighting as one scrolls
     private void batch(final Runnable runnable) {
         try {
             beginBatchEdit();
@@ -355,6 +340,30 @@ public void setSaveInstanceState(final boolean save) {
         _saveInstanceState = save;
     }
 
+    @Override
+    public boolean onPreDraw() {
+        try {
+            return super.onPreDraw();
+        } catch (OutOfMemoryError ignored) {
+            return false; // return false to cancel current drawing pass/round
+        }
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        try {
+            super.onDraw(canvas);
+
+            if (_staticCursorDrawer != null && hasFocus()) {
+                _staticCursorDrawer.draw(canvas);
+            }
+        } catch (Exception e) {
+            // Hinder drawing from crashing the app
+            Log.e(getClass().getName(), "HighlightingEditor onDraw->super.onDraw crash" + e);
+            Toast.makeText(getContext(), e.toString(), Toast.LENGTH_SHORT).show();
+        }
+    }
+
     @Override
     public Parcelable onSaveInstanceState() {
         // Call is always required
@@ -379,6 +388,14 @@ public void setTextSize(float size) {
         }
     }
 
+    @Override
+    public void setTextSize(int unit, float size) {
+        super.setTextSize(unit, size);
+        if (_staticCursorDrawer != null) {
+            _staticCursorDrawer.notifyTextSizeChanged();
+        }
+    }
+
     @Override
     public void setText(final CharSequence text, final BufferType type) {
         super.setText(text, type);
@@ -412,7 +429,7 @@ public void sendAccessibilityEventUnchecked(AccessibilityEvent event) {
         }
     }
 
-    // Hleditor will report that it is not autofillable under certain circumstances
+    // HighlightingEditor will report that it is not auto-fillable under certain circumstances
     @RequiresApi(api = Build.VERSION_CODES.O)
     @Override
     public int getAutofillType() {
@@ -452,14 +469,12 @@ protected void onSelectionChanged(int selStart, int selEnd) {
         if (MainActivity.IS_DEBUG_ENABLED) {
             AppSettings.appendDebugLog("Selection changed: " + selStart + "->" + selEnd);
         }
-    }
 
-    @Override
-    protected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec) {
-        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+        if (_staticCursorDrawer != null) {
+            _staticCursorDrawer.notifySelectionChanged(selStart, selEnd);
+        }
     }
 
-
     // Auto-format
     // ---------------------------------------------------------------------------------------------
 
@@ -608,4 +623,109 @@ public void onDestroyActionMode(ActionMode mode) {
     public int getTextChangedNumber() {
         return _textChangedNumber;
     }
+
+    // Static cursor (redraw cursor)
+    // ---------------------------------------------------------------------------------------------
+
+    /**
+     * Static cursor drawer for EditText.
+     */
+    static class StaticCursorDrawer {
+
+        private final Paint paint = new Paint();
+        private final EditText editText;
+
+        private float lineHeight;
+        private float offsetY;
+        private final float offsetYBase;
+        private boolean paused;
+
+        public StaticCursorDrawer(final @NonNull EditText editText, final @ColorInt int cursorColor) {
+            this.editText = editText;
+            paint.setColor(cursorColor);
+            offsetYBase = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 16, editText.getResources().getDisplayMetrics());
+            notifyTextSizeChanged(); // Initialize textSize, lineHeight, offsetY and the cursor width
+        }
+
+        /**
+         * Draw static cursor.
+         *
+         * @param canvas The canvas of the EditText.
+         */
+        public void draw(final Canvas canvas) {
+            if (paused) {
+                return;
+            }
+
+            final Layout layout = editText.getLayout();
+            if (layout == null) {
+                return;
+            }
+
+            // Draw static cursor
+            final int selectionStart = editText.getSelectionStart();
+            final int line = layout.getLineForOffset(selectionStart);
+            final float x = layout.getPrimaryHorizontal(selectionStart) + editText.getPaddingStart() + 1;
+            final float y = layout.getLineBaseline(line) + offsetY;
+
+            canvas.drawLine(x, y, x, y + lineHeight, paint);
+        }
+
+        /**
+         * Call on the text size of the EditText has changed when the static cursor is enabled.
+         */
+        public void notifyTextSizeChanged() {
+            float textSize = editText.getTextSize();
+            lineHeight = editText.getLineHeight();
+            offsetY = offsetYBase - textSize;
+
+            // Set the stroke width (cursor width)
+            final DisplayMetrics displayMetrics = editText.getResources().getDisplayMetrics();
+            if (textSize < TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 10, displayMetrics)) {
+                paint.setStrokeWidth(2);
+            } else if (textSize < TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 15, displayMetrics)) {
+                paint.setStrokeWidth(4);
+            } else if (textSize < TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 25, displayMetrics)) {
+                paint.setStrokeWidth(5);
+            } else {
+                paint.setStrokeWidth(6);
+            }
+        }
+
+        /**
+         * Call on the selection of the EditText changed when the static cursor is enabled.
+         *
+         * @param selStart The new selection start location.
+         * @param selEnd   The new selection end location.
+         */
+        public void notifySelectionChanged(int selStart, int selEnd) {
+            if (selStart == selEnd) {
+                if (editText.isCursorVisible()) {
+                    editText.setCursorVisible(false);
+                }
+                if (paused) {
+                    paused = false;
+                }
+            } else if (!paused) {
+                paused = true; // Pause drawing the cursor when selecting text
+            }
+        }
+    }
+
+    public void setStaticCursorEnabled(boolean staticCursorEnabled) {
+        if (staticCursorEnabled) {
+            if (_staticCursorDrawer == null) {
+                _staticCursorDrawer = new StaticCursorDrawer(this, ContextCompat.getColor(getContext(), R.color.accent));
+                setCursorVisible(false);
+                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+                    setTextCursorDrawable(R.drawable.cursor_transparent); // Ensure that the default cursor is invisible
+                }
+            }
+        } else if (_staticCursorDrawer != null) {
+            _staticCursorDrawer = null;
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+                setTextCursorDrawable(R.drawable.cursor_accent);
+            }
+        }
+    }
 }

app/src/main/java/net/gsantner/markor/frontend/textview/LineNumbersView.java

@@ -63,7 +63,7 @@ public void refresh() {
         }
     }
 
-    public void setup(final @NonNull EditText editText) {
+    public void setEditText(final @NonNull EditText editText) {
         if (lineNumbersEnabled) {
             setLineNumbersEnabled(false);
         }

app/src/main/java/net/gsantner/markor/model/AppSettings.java

@@ -918,6 +918,10 @@ public boolean isIndentWithTabKey() {
         return getBool(R.string.pref_key__editor_tab_to_indent, false);
     }
 
+    public boolean isStaticCursorEnabled() {
+        return getBool(R.string.pref_key__editor_static_cursor, false);
+    }
+
     public boolean isExperimentalFeaturesEnabled() {
         return getBool(R.string.pref_key__is_enable_experimental_features, BuildConfig.IS_TEST_BUILD);
     }

app/src/main/res/drawable/cursor_accent.xml

@@ -10,7 +10,7 @@
     *
     #########################################################*/
 -->
-<shape xmlns:android="http://schemas.android.com/apk/res/android" >
+<shape xmlns:android="http://schemas.android.com/apk/res/android">
     <size android:width="2dp" />
-    <solid android:color="@color/accent"  />
+    <solid android:color="@color/accent" />
 </shape>

app/src/main/res/drawable/cursor_transparent.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+    /*#######################################################
+    *
+ *   Maintained 2017-2025 by Gregor Santner <gsantner AT mailbox DOT org>
+
+    *
+    *   License: Apache 2.0
+    *  https://github.com/gsantner/opoc/#licensing
+    *  https://www.apache.org/licenses/LICENSE-2.0
+    *
+    #########################################################*/
+-->
+<shape xmlns:android="http://schemas.android.com/apk/res/android">
+    <size android:width="1px" />
+    <solid android:color="@color/transparent" />
+</shape>

app/src/main/res/drawable/ic_input_cursor_black_24dp.xml

@@ -0,0 +1,25 @@
+<!--
+  ~ Copyright (C) 2026 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.
+  -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M8,21V19H11V5H8V3H16V5H13V19H16V21H8ZM18.05,7.05L23,12L18.05,16.95L16.636,15.535L20.172,12L16.636,8.464L18.05,7.05ZM5.95,7.05L7.364,8.464L3.828,12L7.364,15.535L5.95,16.95L1,12L5.95,7.05Z" />
+</vector>

app/src/main/res/values/string-not_translatable.xml

@@ -420,6 +420,7 @@ work. If not, see <https://creativecommons.org/publicdomain/zero/1.0/>.
     <string name="pref_key__restore_settings" translatable="false">pref_key__restore_settings</string>
     <string name="pref_key__backup_settings" translatable="false">pref_key__backup_settings</string>
     <string name="pref_key__editor_tab_to_indent" translatable="false">pref_key__editor_tab_to_indent</string>
+    <string name="pref_key__editor_static_cursor" translatable="false">pref_key__editor_static_cursor</string>
     <string name="hidden_password" translatable="false">****</string>
     <string name="pref_key__todotxt__additional_projects_contexts" translatable="false">"pref_key__todotxt__additional_projects_contexts"</string>
     <string name="pref_key__todotxt__due_date_offset" translatable="false">pref_key__todotxt_due_date_offset</string>

app/src/main/res/values/strings.xml

@@ -501,5 +501,7 @@ work. If not, see <https://creativecommons.org/publicdomain/zero/1.0/>.
     <string name="capitalize_words">Capitalize Words (a note→A Note)</string>
     <string name="capitalize_sentences">Capitalize Sentences (a note→A note)</string>
     <string name="use_tab_to_indent">Indent lines with TAB key</string>
+    <string name="static_cursor">Static cursor</string>
+    <string name="disable_cursor_blinking">Disable cursor blinking</string>
     <string name="folder_local">Folder local</string>
 </resources>

app/src/main/res/xml/preferences_master.xml

@@ -90,12 +90,6 @@
 
 
         <PreferenceCategory android:title="@string/features">
-            <CheckBoxPreference
-                android:defaultValue="true"
-                android:icon="@drawable/ic_highlight_black_24dp"
-                android:key="@string/pref_key__is_highlighting_activated"
-                android:summary="@string/highlighting_enabled_or_not__appspecific"
-                android:title="@string/syntax_highlighting" />
             <CheckBoxPreference
                 android:defaultValue="false"
                 android:icon="@drawable/ic_widgets_black_24dp"
@@ -296,6 +290,12 @@
         </PreferenceScreen>
 
         <PreferenceCategory android:title="@string/syntax_highlighting">
+            <CheckBoxPreference
+                android:defaultValue="true"
+                android:icon="@drawable/ic_highlight_black_24dp"
+                android:key="@string/pref_key__is_highlighting_activated"
+                android:summary="@string/highlighting_enabled_or_not__appspecific"
+                android:title="@string/syntax_highlighting" />
             <CheckBoxPreference
                 android:defaultValue="false"
                 android:icon="@drawable/ic_format_color_fill_black_24dp"
@@ -358,6 +358,12 @@
                 android:key="@string/pref_key__editor_start_editing_in_center"
                 android:summary="@string/edit_text_in_center_of_screen"
                 android:title="@string/center_text" />
+            <CheckBoxPreference
+                android:defaultValue="false"
+                android:icon="@drawable/ic_input_cursor_black_24dp"
+                android:key="@string/pref_key__editor_static_cursor"
+                android:summary="@string/disable_cursor_blinking"
+                android:title="@string/static_cursor" />
             <CheckBoxPreference
                 android:defaultValue="false"
                 android:icon="@drawable/ic_vertical_align_bottom_black_24dp"