Node / meshtastic / Meshtastic-Android / files / core / navigation / src / commonMain / kotlin / org / meshtastic / core / navigation / MultiBackstack.kt

Displaying Raw • Download

T8b949e/*

* Copyright (c) 2026 Meshtastic LLC

*

* This program is free software: you can redistribute it and/or modify

* it under the terms of the GNU General Public License as published by

* the Free Software Foundation, either version 3 of the License, or

* (at your option) any later version.

*

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

* GNU General Public License for more details.

*

* You should have received a copy of the GNU General Public License

* along with this program. If not, see <https://www.gnu.org/licenses/>.

*/

Tff7b72package T7ee787org.meshtastic.core.navigation

Tff7b72import T7ee787androidx.compose.runtime.Composable

Tff7b72import T7ee787androidx.compose.runtime.getValue

Tff7b72import T7ee787androidx.compose.runtime.key

Tff7b72import T7ee787androidx.compose.runtime.mutableStateOf

Tff7b72import T7ee787androidx.compose.runtime.remember

Tff7b72import T7ee787androidx.compose.runtime.setValue

Tff7b72import T7ee787androidx.navigation3.runtime.NavBackStack

Tff7b72import T7ee787androidx.navigation3.runtime.NavKey

Tff7b72import T7ee787androidx.navigation3.runtime.rememberNavBackStack

T8b949e/** Manages independent backstacks for multiple tabs. */

Tff7b72class T56d364MultiBackstackTb4b4b4(Tff7b72val Te6edf3startTabTb4b4b4: Te6edf3NavKeyTb4b4b4) Tb4b4b4{

Tff7b72var Te6edf3backStacksTb4b4b4: Te6edf3MapTff7b72<Te6edf3NavKeyTb4b4b4, Te6edf3NavBackStackTff7b72<Te6edf3NavKeyTff7b72>Tff7b72> Tff7b72= Te6edf3emptyMapTb4b4b4(Tb4b4b4)

Tff7b72var Te6edf3currentTabRouteTb4b4b4: Te6edf3NavKey Tff7b72by Te6edf3mutableStateOfTb4b4b4(Te6edf3TopLevelDestinationTb4b4b4.Te6edf3fromNavKeyTb4b4b4(Te6edf3startTabTb4b4b4)Tff7b72?.Te6edf3route Tff7b72?: Te6edf3startTabTb4b4b4)

Te6edf3private Tff7b72set

Tff7b72val Te6edf3activeBackStackTb4b4b4: Te6edf3NavBackStackTff7b72<Te6edf3NavKeyTff7b72>

Tff7b72getTb4b4b4(Tb4b4b4) Tff7b72= Te6edf3backStacksTff7b72[Te6edf3currentTabRouteTff7b72] Tff7b72?: Te6edf3errorTb4b4b4(Ta5d6ff"Ta5d6ffStack for Tffd700$Te6edf3currentTabRouteTa5d6ff not foundTa5d6ff"Tb4b4b4)

T8b949e/** Switches to a new top-level tab route. */

Tff7b72fun Td2a8ffnavigateTopLevelTb4b4b4(Te6edf3routeTb4b4b4: Te6edf3NavKeyTb4b4b4) Tb4b4b4{

Tff7b72val Te6edf3rootKey Tff7b72= Te6edf3TopLevelDestinationTb4b4b4.Te6edf3fromNavKeyTb4b4b4(Te6edf3routeTb4b4b4)Tff7b72?.Te6edf3route Tff7b72?: Te6edf3route

Tff7b72if Tb4b4b4(Te6edf3currentTabRoute Tff7b72=Tff7b72= Te6edf3rootKeyTb4b4b4) Tb4b4b4{

T8b949e// Repressing the same tab resets its stack to just the root

Te6edf3activeBackStackTb4b4b4.Te6edf3replaceAllTb4b4b4(Te6edf3listOfTb4b4b4(Te6edf3rootKeyTb4b4b4)Tb4b4b4)

Tb4b4b4} Tff7b72else Tb4b4b4{

T8b949e// Switching to a different tab

Te6edf3currentTabRoute Tff7b72= Te6edf3rootKey

Tb4b4b4}

Tb4b4b4}

T8b949e/** Handles back navigation according to the "exit through home" pattern. */

Tff7b72fun Td2a8ffgoBackTb4b4b4(Tb4b4b4) Tb4b4b4{

Tff7b72val Te6edf3currentStack Tff7b72= Te6edf3activeBackStack

Tff7b72if Tb4b4b4(Te6edf3currentStackTb4b4b4.Te6edf3size Tff7b72> T79c0ff1Tb4b4b4) Tb4b4b4{

Te6edf3currentStackTb4b4b4.Te6edf3removeLastOrNullTb4b4b4(Tb4b4b4)

Tff7b72return

Tb4b4b4}

T8b949e// If we're at the root of a non-start tab, switch back to the start tab

Tff7b72if Tb4b4b4(Te6edf3currentTabRoute Tff7b72!Tff7b72= Te6edf3startTabTb4b4b4) Tb4b4b4{

Te6edf3currentTabRoute Tff7b72= Te6edf3startTab

Tb4b4b4}

Tb4b4b4}

T8b949e/** Sets the active tab and replaces its stack with the provided route path. */

Tff7b72fun Td2a8ffhandleDeepLinkTb4b4b4(Te6edf3navKeysTb4b4b4: Te6edf3ListTff7b72<Te6edf3NavKeyTff7b72>Tb4b4b4) Tb4b4b4{

Tff7b72val Te6edf3rootKey Tff7b72= Te6edf3navKeysTb4b4b4.Te6edf3firstOrNullTb4b4b4(Tb4b4b4) Tff7b72?: Tff7b72return

Tff7b72val Te6edf3topLevel Tff7b72= Te6edf3TopLevelDestinationTb4b4b4.Te6edf3fromNavKeyTb4b4b4(Te6edf3rootKeyTb4b4b4)Tff7b72?.Te6edf3route Tff7b72?: Te6edf3rootKey

Te6edf3currentTabRoute Tff7b72= Te6edf3topLevel

Tff7b72val Te6edf3stack Tff7b72= Te6edf3backStacksTff7b72[Te6edf3topLevelTff7b72] Tff7b72?: Tff7b72return

Te6edf3stackTb4b4b4.Te6edf3replaceAllTb4b4b4(Te6edf3navKeysTb4b4b4)

Tb4b4b4}

Tb4b4b4}

T8b949e/** Remembers a [MultiBackstack] for managing independent tab navigation histories with Navigation 3. */

Tf0883e@Composable

Tff7b72fun Td2a8ffrememberMultiBackstackTb4b4b4(Te6edf3initialTabTb4b4b4: Te6edf3NavKey Tff7b72= Te6edf3TopLevelDestinationTb4b4b4.Te6edf3ConnectionsTb4b4b4.Te6edf3routeTb4b4b4)Tb4b4b4: Te6edf3MultiBackstack Tb4b4b4{

Tff7b72val Te6edf3stacks Tff7b72= Te6edf3mutableMapOfTff7b72<Te6edf3NavKeyTb4b4b4, Te6edf3NavBackStackTff7b72<Te6edf3NavKeyTff7b72>Tff7b72>Tb4b4b4(Tb4b4b4)

Te6edf3TopLevelDestinationTb4b4b4.Te6edf3entriesTb4b4b4.Te6edf3forEach Tb4b4b4{ Te6edf3dest Tff7b72-Tff7b72>

Te6edf3keyTb4b4b4(Te6edf3destTb4b4b4.Te6edf3routeTb4b4b4) Tb4b4b4{ Te6edf3stacksTff7b72[Te6edf3destTb4b4b4.Te6edf3routeTff7b72] Tff7b72= Te6edf3rememberNavBackStackTb4b4b4(Te6edf3MeshtasticNavSavedStateConfigTb4b4b4, Te6edf3destTb4b4b4.Te6edf3routeTb4b4b4) Tb4b4b4}

Tb4b4b4}

Tff7b72val Te6edf3multiBackstack Tff7b72= Te6edf3remember Tb4b4b4{ Te6edf3MultiBackstackTb4b4b4(Te6edf3initialTabTb4b4b4) Tb4b4b4}

Te6edf3multiBackstackTb4b4b4.Te6edf3backStacks Tff7b72= Te6edf3stacks

Tff7b72return Te6edf3multiBackstack

Tb4b4b4}