allow using user-provided font

fixes #494

app/src/main/java/helium314/keyboard/latin/settings/AppearanceSettingsFragment.kt

@@ -7,6 +7,7 @@ import android.content.Intent
 import android.content.SharedPreferences
 import android.content.res.Configuration
 import android.graphics.BitmapFactory
+import android.graphics.Typeface
 import android.net.Uri
 import android.os.Build
 import android.os.Bundle
@@ -36,12 +37,14 @@ import helium314.keyboard.latin.R
 import helium314.keyboard.latin.common.FileUtils
 import helium314.keyboard.latin.customIconNames
 import helium314.keyboard.latin.databinding.ReorderDialogItemBinding
+import helium314.keyboard.latin.utils.DeviceProtectedUtils
 import helium314.keyboard.latin.utils.ResourceUtils
 import helium314.keyboard.latin.utils.confirmDialog
 import helium314.keyboard.latin.utils.getStringResourceOrName
 import helium314.keyboard.latin.utils.infoDialog
 import kotlinx.serialization.encodeToString
 import kotlinx.serialization.json.Json
+import java.io.File
 import java.lang.Float.max
 import java.lang.Float.min
 import java.util.*
@@ -86,6 +89,12 @@ class AppearanceSettingsFragment : SubScreenFragment() {
         loadImage(uri, true, true)
     }
 
+    private val fontFilePicker = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) {
+        if (it.resultCode != Activity.RESULT_OK) return@registerForActivityResult
+        val uri = it.data?.data ?: return@registerForActivityResult
+        saveCustomTypeface(uri)
+    }
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         addPreferencesFromResource(R.xml.prefs_screen_appearance)
@@ -106,6 +115,7 @@ class AppearanceSettingsFragment : SubScreenFragment() {
         }
         findPreference<Preference>("custom_background_image")?.setOnPreferenceClickListener { onClickLoadImage(false) }
         findPreference<Preference>("custom_background_image_landscape")?.setOnPreferenceClickListener { onClickLoadImage(true) }
+        findPreference<Preference>("custom_font")?.setOnPreferenceClickListener { onClickCustomFont() }
         findPreference<Preference>(Settings.PREF_CUSTOM_ICON_NAMES)?.setOnPreferenceClickListener {
             if (needsReload)
                 KeyboardSwitcher.getInstance().forceUpdateKeyboardTheme(requireContext())
@@ -389,6 +399,44 @@ class AppearanceSettingsFragment : SubScreenFragment() {
         KeyboardSwitcher.getInstance().forceUpdateKeyboardTheme(requireContext())
     }
 
+    private fun onClickCustomFont(): Boolean {
+        val intent = Intent(Intent.ACTION_OPEN_DOCUMENT)
+            .addCategory(Intent.CATEGORY_OPENABLE)
+            .setType("*/*")
+        val fontFile = Settings.getCustomFontFile(requireContext())
+        if (fontFile.exists()) {
+            AlertDialog.Builder(requireContext())
+                .setTitle(R.string.custom_font)
+                .setPositiveButton(R.string.load) { _, _ -> fontFilePicker.launch(intent) }
+                .setNegativeButton(android.R.string.cancel, null)
+                .setNeutralButton(R.string.delete) { _, _ ->
+                    fontFile.delete()
+                    Settings.clearCachedTypeface()
+                    KeyboardSwitcher.getInstance().forceUpdateKeyboardTheme(requireContext())
+                }
+                .show()
+        } else {
+            fontFilePicker.launch(intent)
+        }
+        return true
+    }
+
+    private fun saveCustomTypeface(uri: Uri) {
+        val fontFile = Settings.getCustomFontFile(requireContext())
+        val tempFile = File(DeviceProtectedUtils.getFilesDir(context), "temp_file")
+        FileUtils.copyContentUriToNewFile(uri, requireContext(), tempFile)
+        try {
+            val typeface = Typeface.createFromFile(tempFile)
+            fontFile.delete()
+            tempFile.renameTo(fontFile)
+            Settings.clearCachedTypeface()
+            KeyboardSwitcher.getInstance().forceUpdateKeyboardTheme(requireContext())
+        } catch (_: Exception) {
+            infoDialog(requireContext(), R.string.file_read_error)
+            tempFile.delete()
+        }
+    }
+
     private fun setupScalePrefs(prefKey: String, defaultValue: Float) {
         val prefs = sharedPreferences
         val pref = findPreference(prefKey) as? SeekBarDialogPreference

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

@@ -14,6 +14,7 @@ import android.content.res.Configuration;
 import android.content.res.Resources;
 import android.graphics.BitmapFactory;
 import android.graphics.Color;
+import android.graphics.Typeface;
 import android.graphics.drawable.BitmapDrawable;
 import android.graphics.drawable.Drawable;
 import android.os.Build;
@@ -196,6 +197,7 @@ public final class Settings implements SharedPreferences.OnSharedPreferenceChang
 
     // static cache for background images to avoid potentially slow reload on every settings reload
     private final static Drawable[] sCachedBackgroundImages = new Drawable[4];
+    private static Typeface sCachedTypeface;
     private Map<String, Integer> mCustomToolbarKeyCodes = null;
     private Map<String, Integer> mCustomToolbarLongpressCodes = null;
 
@@ -729,4 +731,25 @@ public final class Settings implements SharedPreferences.OnSharedPreferenceChang
             mCustomToolbarLongpressCodes = ToolbarUtilsKt.readCustomLongpressCodes(mPrefs);
         return mCustomToolbarLongpressCodes.get(key.name());
     }
+
+    public static File getCustomFontFile(final Context context) {
+        return new File(DeviceProtectedUtils.getFilesDir(context), "custom_font");
+    }
+
+    @Nullable
+    public Typeface readCustomTypeface() {
+        // dammit, dann würde wenns keins gibt bei jedem zugriff gesucht -> 2 variablen nehmen? custom und hasCustom?
+        // ein clear brauchen wir sowieso on theme changed (und auch triggern wenn man ne font setzt/löscht)
+        // try/catch!
+        if (sCachedTypeface == null) {
+            try {
+                sCachedTypeface = Typeface.createFromFile(getCustomFontFile(mContext));
+            } catch (Exception e) { }
+        }
+        return sCachedTypeface;
+    }
+
+    public static void clearCachedTypeface() {
+        sCachedTypeface = null;
+    }
 }

app/src/main/java/helium314/keyboard/latin/suggestions/SuggestionStripView.java

@@ -15,6 +15,7 @@ import android.content.SharedPreferences;
 import android.content.res.Resources;
 import android.graphics.Color;
 import android.graphics.PorterDuff;
+import android.graphics.Typeface;
 import android.graphics.drawable.Drawable;
 import android.graphics.drawable.GradientDrawable;
 import android.graphics.drawable.ShapeDrawable;
@@ -155,11 +156,14 @@ public final class SuggestionStripView extends RelativeLayout implements OnClick
         mToolbar = findViewById(R.id.toolbar);
         mToolbarContainer = findViewById(R.id.toolbar_container);
 
+        final Typeface customTypeface = Settings.getInstance().readCustomTypeface();
         for (int pos = 0; pos < SuggestedWords.MAX_SUGGESTIONS; pos++) {
             final TextView word = new TextView(context, null, R.attr.suggestionWordStyle);
             word.setContentDescription(getResources().getString(R.string.spoken_empty_suggestion));
             word.setOnClickListener(this);
             word.setOnLongClickListener(this);
+            if (customTypeface != null)
+                word.setTypeface(customTypeface);
             colors.setBackground(word, ColorType.STRIP_BACKGROUND);
             mWordViews.add(word);
             final View divider = inflater.inflate(R.layout.suggestion_divider, null);