From 4944fcd16235b27f392874f0195ca465a6199ea6 Mon Sep 17 00:00:00 2001
From: avi <avi@localhost>
Date: Mon, 14 Sep 2026 08:03:33 -0500
Subject: [PATCH] Desktop: app-wide zoom (Ctrl+=/-, Ctrl+0 resets) via scaled
 Density

---
 .../main/kotlin/com/shonar/desktop/Main.kt    | 54 ++++++++++++++++---
 1 file changed, 47 insertions(+), 7 deletions(-)

diff --git a/desktop/app/src/main/kotlin/com/shonar/desktop/Main.kt b/desktop/app/src/main/kotlin/com/shonar/desktop/Main.kt
index e4be34d..f0b7a52 100644
--- a/desktop/app/src/main/kotlin/com/shonar/desktop/Main.kt
+++ b/desktop/app/src/main/kotlin/com/shonar/desktop/Main.kt
@@ -4,31 +4,71 @@ import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.padding
 import androidx.compose.material3.Surface
+import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.input.key.Key
+import androidx.compose.ui.input.key.KeyEventType
+import androidx.compose.ui.input.key.isCtrlPressed
+import androidx.compose.ui.input.key.key
+import androidx.compose.ui.input.key.onPreviewKeyEvent
+import androidx.compose.ui.input.key.type
+import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.unit.Density
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.window.Window
 import androidx.compose.ui.window.application
 import androidx.compose.ui.window.rememberWindowState
 
+/** Scales every dp/sp in the app uniformly (fonts, paddings, controls). */
+private data class ScaledDensity(val base: Density, val zoom: Float) : Density {
+    override val density: Float get() = base.density * zoom
+    override val fontScale: Float get() = base.fontScale * zoom
+}
+
 fun main() = application {
     val state = remember { DesktopState() }
     val screen by state.screen.collectAsState()
+    // Ctrl+= / Ctrl+- zoom the whole app; Ctrl+0 resets (after a zoom).
+    var zoom by remember { mutableStateOf(1f) }
     Window(
         onCloseRequest = ::exitApplication,
         title = "SHONAR Desktop",
         state = rememberWindowState(width = 1100.dp, height = 800.dp),
     ) {
+        val baseDensity = LocalDensity.current
         ShonarTheme {
-            Surface(Modifier.fillMaxSize()) {
-                Box(Modifier.fillMaxSize().padding(20.dp)) {
-                    when (screen) {
-                        DesktopState.Screen.ENGINE -> EngineScreen(state)
-                        DesktopState.Screen.LIBRARY -> LibraryScreen(state)
-                        DesktopState.Screen.DETAIL -> DetailScreen(state)
-                        DesktopState.Screen.SETTINGS -> SettingsScreen(state)
+            Surface(
+                Modifier.fillMaxSize().onPreviewKeyEvent { e ->
+                    if (e.type != KeyEventType.KeyDown || !e.isCtrlPressed) return@onPreviewKeyEvent false
+                    when (e.key) {
+                        Key.Equals, Key.Plus, Key.NumPadAdd -> {
+                            zoom = (zoom * 1.1f).coerceAtMost(3f); true
+                        }
+                        Key.Minus, Key.NumPadSubtract -> {
+                            zoom = (zoom / 1.1f).coerceAtLeast(0.4f); true
+                        }
+                        Key.Zero, Key.NumPad0 -> {
+                            if (zoom != 1f) { zoom = 1f; true } else false
+                        }
+                        else -> false
+                    }
+                },
+            ) {
+                CompositionLocalProvider(
+                    LocalDensity provides ScaledDensity(baseDensity, zoom),
+                ) {
+                    Box(Modifier.fillMaxSize().padding(20.dp)) {
+                        when (screen) {
+                            DesktopState.Screen.ENGINE -> EngineScreen(state)
+                            DesktopState.Screen.LIBRARY -> LibraryScreen(state)
+                            DesktopState.Screen.DETAIL -> DetailScreen(state)
+                            DesktopState.Screen.SETTINGS -> SettingsScreen(state)
+                        }
                     }
                 }
             }