implement freesnap splitscreen mod

Author: programminghoch10

SplitScreenMods/Readme.md

@@ -17,3 +17,6 @@ Keep the split screen ratio, when switching one of the split apps.
 Only required on Android 14 and later,
 since previous versions did not force a split resize in this situation.
 
+## FreeSnap
+
+Allow any split ratio instead of snapping to predefined ratios.

SplitScreenMods/src/main/assets/xposed_init

@@ -1,2 +1,3 @@
 com.programminghoch10.SplitScreenMods.AlwaysAllowMultiInstanceSplitHook
+com.programminghoch10.SplitScreenMods.FreeSnapHook
 com.programminghoch10.SplitScreenMods.KeepSplitScreenRatioHook

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

@@ -0,0 +1,37 @@
+package com.programminghoch10.SplitScreenMods
+
+import android.os.Build
+import com.programminghoch10.SplitScreenMods.BuildConfig.SHARED_PREFERENCES_NAME
+import com.programminghoch10.SplitScreenMods.FreeSnapHookConfig.enabled
+import de.binarynoise.logger.Logger.log
+import de.robv.android.xposed.IXposedHookLoadPackage
+import de.robv.android.xposed.XC_MethodHook
+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 FreeSnapHookConfig {
+    @JvmField
+    val enabled = Build.VERSION.SDK_INT >= Build.VERSION_CODES.UPSIDE_DOWN_CAKE
+}
+
+class FreeSnapHook : IXposedHookLoadPackage {
+    override fun handleLoadPackage(lpparam: XC_LoadPackage.LoadPackageParam) {
+        if (lpparam.packageName != "com.android.systemui") return
+        if (!enabled) return
+        log("handleLoadPackage(${lpparam.packageName} in process ${lpparam.processName})")
+        val preferences = XSharedPreferences(BuildConfig.APPLICATION_ID, SHARED_PREFERENCES_NAME)
+        val enabled = preferences.getBoolean("FreeSnap", false)
+        if (!enabled) return
+        
+        val DividerSnapAlgorithmClass =
+            XposedHelpers.findClass("com.android.wm.shell.common.split.DividerSnapAlgorithm", lpparam.classLoader)
+        XposedBridge.hookAllConstructors(DividerSnapAlgorithmClass, object : XC_MethodHook() {
+            override fun afterHookedMethod(param: MethodHookParam) {
+                XposedHelpers.setBooleanField(param.thisObject, "mFreeSnapMode", true)
+                log("${DividerSnapAlgorithmClass.simpleName} mFreeSnapMode constant changed to true")
+            }
+        })
+    }
+}

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

@@ -15,4 +15,8 @@
         Keep the split screen ratio, when switching one of the split apps.
     </string>
     <string name="restart_required">A restart is required to apply changes!</string>
+    <string name="freesnap_title">FreeSnap</string>
+    <string name="freesnap_summary">
+        Allow any split ratio instead of snapping to predefined ratios.
+    </string>
 </resources>

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

@@ -17,4 +17,10 @@
         app:summary="@string/keepsplitscreenratio_summary"
         app:title="@string/keepsplitscreenratio_title"
         />
+    <CheckBoxPreference
+        app:iconSpaceReserved="false"
+        app:key="FreeSnap"
+        app:summary="@string/freesnap_summary"
+        app:title="@string/freesnap_title"
+        />
 </PreferenceScreen>

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

@@ -2,3 +2,4 @@ A collection of various SplitScreen modifications.
 
 * AlwaysAllowMultiInstanceSplit
 * KeepSplitScreenRatio
+* FreeSnap