Add setting (off by default) to prevent screenshots. (#685)

* Add setting (off by default) to prevent screenshots.

* Move secure window handling to the Theme.

---------

Co-authored-by: Dessalines <[email protected]>

Author: camporter

app/src/main/java/com/jerboa/db/AppDB.kt

@@ -103,6 +103,11 @@ data class AppSettings(
         defaultValue = "0",
     )
     val usePrivateTabs: Boolean,
+    @ColumnInfo(
+        name = "secure_window",
+        defaultValue = "0",
+    )
+    val secureWindow: Boolean,
 )
 
 @Dao
@@ -400,8 +405,17 @@ val MIGRATION_13_14 = object : Migration(13, 14) {
     }
 }
 
+val MIGRATION_14_15 = object : Migration(14, 15) {
+    override fun migrate(database: SupportSQLiteDatabase) {
+        database.execSQL(UPDATE_APP_CHANGELOG_UNVIEWED)
+        database.execSQL(
+            "ALTER TABLE AppSettings add column secure_window INTEGER NOT NULL default 0",
+        )
+    }
+}
+
 @Database(
-    version = 14,
+    version = 15,
     entities = [Account::class, AppSettings::class],
     exportSchema = true,
 )
@@ -439,6 +453,7 @@ abstract class AppDB : RoomDatabase() {
                         MIGRATION_11_12,
                         MIGRATION_12_13,
                         MIGRATION_13_14,
+                        MIGRATION_14_15,
                     )
                     // Necessary because it can't insert data on creation
                     .addCallback(object : Callback() {

app/src/main/java/com/jerboa/ui/components/settings/lookandfeel/LookAndFeelActivity.kt

@@ -62,6 +62,8 @@ fun LookAndFeelActivity(
     val useCustomTabsState = rememberBooleanSettingState(settings?.useCustomTabs ?: true)
     val usePrivateTabsState = rememberBooleanSettingState(settings?.usePrivateTabs ?: false)
 
+    val secureWindowState = rememberBooleanSettingState(settings?.secureWindow ?: false)
+
     val snackbarHostState = remember { SnackbarHostState() }
 
     val scrollState = rememberScrollState()
@@ -81,6 +83,7 @@ fun LookAndFeelActivity(
                 showVotingArrowsInListView = showVotingArrowsInListViewState.value,
                 useCustomTabs = useCustomTabsState.value,
                 usePrivateTabs = usePrivateTabsState.value,
+                secureWindow = secureWindowState.value,
             ),
         )
     }
@@ -209,6 +212,13 @@ fun LookAndFeelActivity(
                     },
                     onCheckedChange = { updateAppSettings() },
                 )
+                SettingsCheckbox(
+                    state = secureWindowState,
+                    title = {
+                        Text(text = stringResource(R.string.look_and_feel_secure_window))
+                    },
+                    onCheckedChange = { updateAppSettings() },
+                )
             }
         },
     )

app/src/main/java/com/jerboa/ui/theme/Theme.kt

@@ -2,6 +2,7 @@ package com.jerboa.ui.theme
 
 import android.app.Activity
 import android.os.Build
+import android.view.WindowManager
 import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.material3.ColorScheme
 import androidx.compose.material3.MaterialTheme
@@ -84,6 +85,14 @@ fun JerboaTheme(
         else -> true
     }
 
+    appSettings?.let {
+        if (it.secureWindow) {
+            window.addFlags(WindowManager.LayoutParams.FLAG_SECURE)
+        } else {
+            window.clearFlags(WindowManager.LayoutParams.FLAG_SECURE)
+        }
+    }
+
     window.statusBarColor = colors.background.toArgb()
     // The navigation bar color is also set on BottomAppBarAll
     window.navigationBarColor = colors.background.toArgb()

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

@@ -182,6 +182,7 @@
     <string name="look_and_feel_post_view_card">Card</string>
     <string name="look_and_feel_post_view_list">List</string>
     <string name="look_and_feel_post_view_small_card">Small Card</string>
+    <string name="look_and_feel_secure_window">Prevent Screenshots</string>
     <string name="look_and_feel_show_action_bar_for_comments">Show action bar by default for comments</string>
     <string name="look_and_feel_show_navigation_bar">Show navigation bar</string>
     <string name="look_and_feel_show_voting_arrows_list_view">Show voting arrows in list view</string>