Option to customize start lag for gestures during fast typing (#894)

fixes #882

app/src/main/java/helium314/keyboard/keyboard/internal/GestureStrokeRecognitionParams.java

@@ -40,7 +40,7 @@ public final class GestureStrokeRecognitionParams {
 
     private GestureStrokeRecognitionParams() {
         // These parameter values are default and intended for testing.
-        mStaticTimeThresholdAfterFastTyping = 350; // msec
+        mStaticTimeThresholdAfterFastTyping = 500; // msec
         mDetectFastMoveSpeedThreshold = 1.5f; // keyWidth/sec
         mDynamicThresholdDecayDuration = 450; // msec
         mDynamicTimeThresholdFrom = 300; // msec

app/src/main/java/helium314/keyboard/keyboard/internal/GestureStrokeRecognitionPoints.java

@@ -6,6 +6,7 @@
 
 package helium314.keyboard.keyboard.internal;
 
+import helium314.keyboard.latin.settings.Settings;
 import helium314.keyboard.latin.utils.Log;
 
 import helium314.keyboard.latin.common.Constants;
@@ -104,7 +105,7 @@ public final class GestureStrokeRecognitionPoints {
     public void addDownEventPoint(final int x, final int y, final int elapsedTimeSinceFirstDown,
             final int elapsedTimeSinceLastTyping) {
         reset();
-        if (elapsedTimeSinceLastTyping < mRecognitionParams.mStaticTimeThresholdAfterFastTyping) {
+        if (elapsedTimeSinceLastTyping < Settings.getInstance().getCurrent().mGestureFastTypingCooldown) {
             mAfterFastTyping = true;
         }
         if (DEBUG) {

app/src/main/java/helium314/keyboard/latin/settings/GestureSettingsFragment.java

@@ -7,6 +7,7 @@
 package helium314.keyboard.latin.settings;
 
 import android.content.SharedPreferences;
+import android.content.res.Resources;
 import android.os.Bundle;
 
 import helium314.keyboard.latin.R;
@@ -25,6 +26,7 @@ public final class GestureSettingsFragment extends SubScreenFragment {
     public void onCreate(final Bundle icicle) {
         super.onCreate(icicle);
         addPreferencesFromResource(R.xml.prefs_screen_gesture);
+        setupGestureFastTypingCooldownPref();
         refreshSettingsEnablement();
     }
 
@@ -38,5 +40,46 @@ public final class GestureSettingsFragment extends SubScreenFragment {
         setPreferenceVisible(Settings.PREF_GESTURE_PREVIEW_TRAIL, Settings.readGestureInputEnabled(prefs));
         setPreferenceVisible(Settings.PREF_GESTURE_FLOATING_PREVIEW_TEXT, Settings.readGestureInputEnabled(prefs));
         setPreferenceVisible(Settings.PREF_GESTURE_SPACE_AWARE, Settings.readGestureInputEnabled(prefs));
+        setPreferenceVisible(Settings.PREF_GESTURE_FAST_TYPING_COOLDOWN, Settings.readGestureInputEnabled(prefs));
+    }
+
+    private void setupGestureFastTypingCooldownPref() {
+        final SeekBarDialogPreference pref = findPreference(
+                Settings.PREF_GESTURE_FAST_TYPING_COOLDOWN);
+        if (pref == null) return;
+        final SharedPreferences prefs = getSharedPreferences();
+        final Resources res = getResources();
+        pref.setInterface(new SeekBarDialogPreference.ValueProxy() {
+            @Override
+            public void writeValue(final int value, final String key) {
+                prefs.edit().putInt(key, value).apply();
+            }
+
+            @Override
+            public void writeDefaultValue(final String key) {
+                prefs.edit().remove(key).apply();
+            }
+
+            @Override
+            public int readValue(final String key) {
+                return Settings.readGestureFastTypingCooldown(prefs, res);
+            }
+
+            @Override
+            public int readDefaultValue(final String key) {
+                return Settings.readDefaultGestureFastTypingCooldown(res);
+            }
+
+            @Override
+            public String getValueText(final int value) {
+                if (value == 0) {
+                    return res.getString(R.string.gesture_fast_typing_cooldown_instant);
+                }
+                return res.getString(R.string.abbreviation_unit_milliseconds, String.valueOf(value));
+            }
+
+            @Override
+            public void feedbackValue(final int value) {}
+        });
     }
 }

app/src/main/java/helium314/keyboard/latin/settings/Settings.java

@@ -115,6 +115,7 @@ public final class Settings implements SharedPreferences.OnSharedPreferenceChang
     public static final String PREF_GESTURE_PREVIEW_TRAIL = "gesture_preview_trail";
     public static final String PREF_GESTURE_FLOATING_PREVIEW_TEXT = "gesture_floating_preview_text";
     public static final String PREF_GESTURE_SPACE_AWARE = "gesture_space_aware";
+    public static final String PREF_GESTURE_FAST_TYPING_COOLDOWN = "gesture_fast_typing_cooldown";
     public static final String PREF_SHOW_SETUP_WIZARD_ICON = "show_setup_wizard_icon";
     public static final String PREF_USE_CONTACTS = "use_contacts";
     public static final String PREFS_LONG_PRESS_SYMBOLS_FOR_NUMPAD = "long_press_symbols_for_numpad";
@@ -364,6 +365,17 @@ public final class Settings implements SharedPreferences.OnSharedPreferenceChang
         return res.getInteger(R.integer.config_clipboard_history_retention_time);
     }
 
+    public static int readGestureFastTypingCooldown(final SharedPreferences prefs, final Resources res) {
+        final int milliseconds = prefs.getInt(
+                PREF_GESTURE_FAST_TYPING_COOLDOWN, UNDEFINED_PREFERENCE_VALUE_INT);
+        return (milliseconds != UNDEFINED_PREFERENCE_VALUE_INT) ? milliseconds
+                : readDefaultGestureFastTypingCooldown(res);
+    }
+
+    public static int readDefaultGestureFastTypingCooldown(final Resources res) {
+        return res.getInteger(R.integer.config_gesture_static_time_threshold_after_fast_typing);
+    }
+
     public static int readHorizontalSpaceSwipe(final SharedPreferences prefs) {
         return switch (prefs.getString(PREF_SPACE_HORIZONTAL_SWIPE, "none")) {
             case "move_cursor" -> KeyboardActionListener.SWIPE_MOVE_CURSOR;

app/src/main/java/helium314/keyboard/latin/settings/SettingsValues.java

@@ -95,6 +95,7 @@ public class SettingsValues {
     public final boolean mGestureInputEnabled;
     public final boolean mGestureTrailEnabled;
     public final boolean mGestureFloatingPreviewTextEnabled;
+    public final int mGestureFastTypingCooldown;
     public final boolean mSlidingKeyInputPreviewEnabled;
     public final int mKeyLongpressTimeout;
     public final boolean mEnableEmojiAltPhysicalKey;
@@ -199,6 +200,7 @@ public class SettingsValues {
         mAccount = null; // remove? or can it be useful somewhere?
         mGestureFloatingPreviewTextEnabled = !mInputAttributes.mDisableGestureFloatingPreviewText
                 && prefs.getBoolean(Settings.PREF_GESTURE_FLOATING_PREVIEW_TEXT, true);
+        mGestureFastTypingCooldown = Settings.readGestureFastTypingCooldown(prefs, res);
         mOverrideShowingSuggestions = mInputAttributes.mMayOverrideShowingSuggestions && readSuggestionsOverrideEnabled(prefs);
         mSuggestionsEnabledPerUserSettings = (mInputAttributes.mShouldShowSuggestions && readSuggestionsEnabled(prefs))
                 || mOverrideShowingSuggestions;

app/src/main/res/values/config-common.xml

@@ -57,6 +57,7 @@
     <integer name="config_gesture_trail_update_interval">20</integer>
     <!-- Static threshold for gesture after fast typing (msec) -->
     <integer name="config_gesture_static_time_threshold_after_fast_typing">500</integer>
+    <integer name="config_gesture_fast_typing_cooldown_step">10</integer>
     <!-- Static threshold for starting gesture detection (keyWidth%/sec) -->
     <fraction name="config_gesture_detect_fast_move_speed_threshold">150%</fraction>
     <!-- Dynamic threshold for gesture after fast typing (msec) -->

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

@@ -146,8 +146,12 @@
     <string name="gesture_floating_preview_text_summary">See the suggested word while gesturing</string>
     <!-- Option to enable space aware gesture input. The user can input multiple words by gliding through the space key during a gesture input. [CHAR LIMIT=30]-->
     <string name="gesture_space_aware">Phrase gesture</string>
-    <!-- Description for "gesture_space_aware" option. The user can input multiple words by gliding through the space key during a gesture input.[CHAR LIMIT=65]-->
+    <!-- Description for "gesture_space_aware" option. The user can input multiple words by gliding through the space key during a gesture input. [CHAR LIMIT=65]-->
     <string name="gesture_space_aware_summary">Input spaces during gestures by gliding to the space key</string>
+    <!-- Title of the setting to adjust the fast-typing gesture cooldown [CHAR LIMIT=35]-->
+    <string name="gesture_fast_typing_cooldown">Rapid typing cooldown</string>
+    <!-- The text that represents no cooldown [CHAR LIMIT=25]-->
+    <string name="gesture_fast_typing_cooldown_instant">Always start instantly</string>
     <!-- Preferences item for enabling clipboard history -->
     <string name="enable_clipboard_history">Enable clipboard history</string>
     <!-- Description for enabling/disabling clipboard history mentioning that if disabled, clipboard content is pasted -->

app/src/main/res/xml/prefs_screen_gesture.xml

@@ -6,6 +6,7 @@
 -->
 <PreferenceScreen
     xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:latin="http://schemas.android.com/apk/res-auto"
     android:title="@string/settings_screen_gesture"
     android:key="screen_gesture">
     <SwitchPreference
@@ -31,4 +32,9 @@
         android:summary="@string/gesture_space_aware_summary"
         android:defaultValue="false"
         android:persistent="true" />
+    <helium314.keyboard.latin.settings.SeekBarDialogPreference
+        android:key="gesture_fast_typing_cooldown"
+        android:title="@string/gesture_fast_typing_cooldown"
+        latin:maxValue="@integer/config_gesture_static_time_threshold_after_fast_typing"
+        latin:stepValue="@integer/config_gesture_fast_typing_cooldown_step" />
 </PreferenceScreen>