implement KeepSwapRatio

Author: programminghoch10

SplitScreenMods/Readme.md

@@ -17,6 +17,10 @@ Keep the split screen ratio, when switching one of the split apps.
 Only usable on Android 14 and later,
 since previous versions did not force a split resize in this situation.
 
+## KeepSwapRatio
+
+Keep the split ratio while swapping sides.
+
 ## SnapMode
 
 Change the snap mode used by the system:

SplitScreenMods/src/main/assets/xposed_init

@@ -4,5 +4,6 @@ com.programminghoch10.SplitScreenMods.CalculateRatiosHook
 com.programminghoch10.SplitScreenMods.CustomFixedRatioHook
 com.programminghoch10.SplitScreenMods.FreeSnapHook
 com.programminghoch10.SplitScreenMods.KeepSplitScreenRatioHook
+com.programminghoch10.SplitScreenMods.KeepSwapRatioHook
 com.programminghoch10.SplitScreenMods.RemoveMinimalTaskSizeHook
 com.programminghoch10.SplitScreenMods.SnapModeHook

SplitScreenMods/src/main/java/com/programminghoch10/SplitScreenMods/KeepSwapRatioHook.kt

@@ -0,0 +1,52 @@
+package com.programminghoch10.SplitScreenMods
+
+import java.util.function.*
+import android.content.Context
+import android.graphics.Rect
+import android.os.Build
+import com.programminghoch10.SplitScreenMods.BuildConfig.SHARED_PREFERENCES_NAME
+import com.programminghoch10.SplitScreenMods.KeepSwapRatioHookConfig.enabled
+import de.binarynoise.logger.Logger.log
+import de.robv.android.xposed.IXposedHookLoadPackage
+import de.robv.android.xposed.XC_MethodReplacement
+import de.robv.android.xposed.XSharedPreferences
+import de.robv.android.xposed.XposedBridge
+import de.robv.android.xposed.XposedHelpers
+import de.robv.android.xposed.callbacks.XC_LoadPackage
+
+object KeepSwapRatioHookConfig {
+    @JvmField
+    val enabled = Build.VERSION.SDK_INT >= Build.VERSION_CODES.UPSIDE_DOWN_CAKE
+}
+
+class KeepSwapRatioHook : IXposedHookLoadPackage {
+    override fun handleLoadPackage(lpparam: XC_LoadPackage.LoadPackageParam) {
+        if (lpparam.packageName != "com.android.systemui") return
+        if (!enabled) return
+        log("handleLoadPackage(${lpparam.packageName} in process ${lpparam.processName})")
+        val preferences = XSharedPreferences(BuildConfig.APPLICATION_ID, SHARED_PREFERENCES_NAME)
+        val enabled = preferences.getBoolean("KeepSwapRatio", false)
+        if (!enabled) return
+        
+        val SplitLayoutClass = XposedHelpers.findClass("com.android.wm.shell.common.split.SplitLayout", lpparam.classLoader)
+        val playSwapAnimationMethod =
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.VANILLA_ICE_CREAM) SplitLayoutClass.declaredMethods.single { it.name == "playSwapAnimation" }
+            else SplitLayoutClass.declaredMethods.single { it.name == "splitSwitching" }
+        val getDisplayStableInsetsMethod = XposedHelpers.findMethodExact(SplitLayoutClass, "getDisplayStableInsets", Context::class.java)
+        
+        XposedBridge.hookMethod(
+            playSwapAnimationMethod,
+            object : XC_MethodReplacement() {
+                override fun replaceHookedMethod(param: MethodHookParam): Any? {
+                    @Suppress("UNCHECKED_CAST")
+                    val callback = param.args[3] as Consumer<Rect>
+                    val context = XposedHelpers.getObjectField(param.thisObject, "mContext") as Context
+                    val insets = getDisplayStableInsetsMethod.invoke(param.thisObject, context) as Rect
+                    callback.accept(insets)
+                    log("replaced ${playSwapAnimationMethod.name} with dummy implementation to prevent swapping")
+                    return null
+                }
+            },
+        )
+    }
+}

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

@@ -38,4 +38,6 @@
     </string>
     <string name="snaptargets_title">SnapTargets</string>
     <string name="CustomRatio_title">Custom Fixed Ratio</string>
+    <string name="keepswapratio_summary">Keep split ratio when swapping sides</string>
+    <string name="keepswapratio_title">KeepSwapRatio</string>
 </resources>

SplitScreenMods/src/main/res/xml/root_preferences.xml

@@ -18,6 +18,12 @@
             app:summary="@string/keepsplitscreenratio_summary"
             app:title="@string/keepsplitscreenratio_title"
             />
+        <SwitchPreference
+            app:iconSpaceReserved="false"
+            app:key="KeepSwapRatio"
+            app:summary="@string/keepswapratio_summary"
+            app:title="@string/keepswapratio_title"
+            />
     </PreferenceCategory>
     <PreferenceCategory
         app:iconSpaceReserved="false"

metadata/com.programminghoch10.SplitScreenMods/en-US/full_description.txt

@@ -2,6 +2,7 @@ A collection of various SplitScreen modifications.
 
 * AlwaysAllowMultiInstanceSplit
 * KeepSplitScreenRatio
+* KeepSwapRatio
 * SnapMode
 * FreeSnap
 * AdditionalSnapTargets