COMPOSE-356 Support light theme for codeviewer example (#3853)

https://youtrack.jetbrains.com/issue/COMPOSE-356/Add-Dark-theme-to-codeviewer-examples

The MR does the following:
- Enables dark theme for iOS, Android and Desktop platforms
- Expands compose view to fullscreen and uses window padding to adjust
content location
- Adjusts toolbar clock style to application theme on mobile platforms

examples/codeviewer/androidApp/src/androidMain/AndroidManifest.xml

@@ -7,11 +7,11 @@
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
-        android:theme="@style/Theme.AppCompat.Light.NoActionBar">
+        android:theme="@style/Theme.Application">
         <activity
             android:exported="true"
             android:name="MainActivity"
-        >
+            android:windowSoftInputMode="adjustResize">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 

examples/codeviewer/androidApp/src/androidMain/assets/data/EditorView.kt

@@ -48,7 +48,7 @@ fun EditorView(model: Editor, settings: Settings) = key(model) {
                                 )
                                 .width(1.dp)
                                 .fillMaxHeight()
-                                .background(AppTheme.colors.backgroundLight)
+                                .background(AppTheme.colors.codeGuide)
                         )
                     }
                 } else {

examples/codeviewer/androidApp/src/androidMain/kotlin/org/jetbrains/codeviewer/MainActivity.kt

@@ -1,10 +1,11 @@
 package org.jetbrains.codeviewer
 
+import MainView
 import android.os.Bundle
 import androidx.activity.compose.setContent
 import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.WindowCompat
 import org.jetbrains.codeviewer.platform._HomeFolder
-import MainView
 import java.io.File
 import java.io.FileOutputStream
 
@@ -14,6 +15,8 @@ class MainActivity : AppCompatActivity() {
         copyAssets()
         _HomeFolder = filesDir
 
+        WindowCompat.setDecorFitsSystemWindows(window, false)
+
         setContent {
             MainView()
         }

examples/codeviewer/androidApp/src/androidMain/res/values-night/styles.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="Theme.Application" parent="Theme.General">
+        <item name="android:windowLightStatusBar">false</item>
+    </style>
+</resources>

examples/codeviewer/androidApp/src/androidMain/res/values/styles.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="Theme.General" parent="Theme.AppCompat.Light.NoActionBar">
+        <item name="android:statusBarColor">@android:color/transparent</item>
+        <item name="android:navigationBarColor">@android:color/transparent</item>
+    </style>
+
+    <style name="Theme.Application" parent="Theme.General">
+        <item name="android:windowLightStatusBar">true</item>
+    </style>
+</resources>

examples/codeviewer/iosApp/iosApp/ContentView.swift

@@ -4,11 +4,8 @@ import shared
 
 struct ContentView: View {
     var body: some View {
-        ZStack {
-            Color(#colorLiteral(red: 0.235, green: 0.247, blue: 0.255, alpha: 1)).ignoresSafeArea(.all)
         ComposeView()
-                .ignoresSafeArea(.all, edges: .bottom) // Compose has own keyboard handler
-        }.preferredColorScheme(.dark)
+            .ignoresSafeArea(.all)
     }
 }
 

examples/codeviewer/shared/src/commonMain/kotlin/org/jetbrains/codeviewer/ui/CodeViewerView.kt

@@ -5,13 +5,25 @@ import androidx.compose.animation.core.SpringSpec
 import androidx.compose.animation.core.animateDpAsState
 import androidx.compose.animation.core.animateFloatAsState
 import androidx.compose.foundation.clickable
-import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.WindowInsets
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.safeDrawing
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.layout.windowInsetsPadding
 import androidx.compose.material.Icon
 import androidx.compose.material.LocalContentColor
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.ArrowBack
 import androidx.compose.material.icons.filled.ArrowForward
-import androidx.compose.runtime.*
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.graphicsLayer
@@ -38,6 +50,9 @@ fun CodeViewerView(model: CodeViewer) {
         ).value
     }
 
+    Box(Modifier
+        .windowInsetsPadding(WindowInsets.safeDrawing)
+    ) {
         VerticalSplittable(
             Modifier.fillMaxSize(),
             panelState.splitter,
@@ -68,6 +83,7 @@ fun CodeViewerView(model: CodeViewer) {
             }
         }
     }
+}
 
 private class PanelState {
     val collapsedSize = 24.dp

examples/codeviewer/shared/src/commonMain/kotlin/org/jetbrains/codeviewer/ui/MainView.kt

@@ -1,13 +1,16 @@
 package org.jetbrains.codeviewer.ui
 
+import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.foundation.text.selection.DisableSelection
 import androidx.compose.material.MaterialTheme
 import androidx.compose.material.Surface
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.runtime.remember
 import org.jetbrains.codeviewer.platform.HomeFolder
-import org.jetbrains.codeviewer.ui.common.AppTheme
+import org.jetbrains.codeviewer.ui.common.LocalTheme
 import org.jetbrains.codeviewer.ui.common.Settings
+import org.jetbrains.codeviewer.ui.common.Theme
 import org.jetbrains.codeviewer.ui.editor.Editors
 import org.jetbrains.codeviewer.ui.filetree.FileTree
 
@@ -24,8 +27,13 @@ fun MainView() {
     }
 
     DisableSelection {
+        val theme = if (isSystemInDarkTheme()) Theme.dark else Theme.light
+
+        CompositionLocalProvider(
+            LocalTheme provides theme,
+        ) {
             MaterialTheme(
-            colors = AppTheme.colors.material
+                colors = theme.materialColors
             ) {
                 Surface {
                     CodeViewerView(codeViewer)
@@ -33,3 +41,4 @@ fun MainView() {
             }
         }
     }
+}

examples/codeviewer/shared/src/commonMain/kotlin/org/jetbrains/codeviewer/ui/common/Theme.kt

@@ -1,32 +1,76 @@
 package org.jetbrains.codeviewer.ui.common
 
+import androidx.compose.material.Colors
 import androidx.compose.material.darkColors
+import androidx.compose.material.lightColors
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.Immutable
+import androidx.compose.runtime.staticCompositionLocalOf
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.text.SpanStyle
 
-object AppTheme {
-    val colors: Colors = Colors()
-
-    val code: Code = Code()
+@Immutable
+data class Theme(
+    val materialColors: Colors,
+    val colors: ExtendedColors,
+    val code: CodeStyle
+) {
+    @Immutable
+    class ExtendedColors(
+        val codeGuide: Color
+    )
 
-    class Colors(
-        val backgroundDark: Color = Color(0xFF2B2B2B),
-        val backgroundMedium: Color = Color(0xFF3C3F41),
-        val backgroundLight: Color = Color(0xFF4E5254),
+    @Immutable
+    data class CodeStyle(
+        val simple: SpanStyle,
+        val value: SpanStyle,
+        val keyword: SpanStyle,
+        val punctuation: SpanStyle,
+        val annotation: SpanStyle,
+        val comment: SpanStyle
+    )
 
-        val material: androidx.compose.material.Colors = darkColors(
-            background = backgroundDark,
-            surface = backgroundMedium,
-            primary = Color.White
+    companion object {
+        val dark = Theme(
+            materialColors = darkColors(
+                background = Color(0xFF2B2B2B),
+                surface = Color(0xFF3C3F41)
             ),
+            colors = ExtendedColors(
+                codeGuide = Color(0xFF4E5254)
+            ),
+            code = CodeStyle(
+                simple = SpanStyle(Color(0xFFA9B7C6)),
+                value = SpanStyle(Color(0xFF6897BB)),
+                keyword = SpanStyle(Color(0xFFCC7832)),
+                punctuation = SpanStyle(Color(0xFFA1C17E)),
+                annotation = SpanStyle(Color(0xFFBBB529)),
+                comment = SpanStyle(Color(0xFF808080))
+            )
         )
 
-    class Code(
-        val simple: SpanStyle = SpanStyle(Color(0xFFA9B7C6)),
-        val value: SpanStyle = SpanStyle(Color(0xFF6897BB)),
-        val keyword: SpanStyle = SpanStyle(Color(0xFFCC7832)),
-        val punctuation: SpanStyle = SpanStyle(Color(0xFFA1C17E)),
-        val annotation: SpanStyle = SpanStyle(Color(0xFFBBB529)),
-        val comment: SpanStyle = SpanStyle(Color(0xFF808080))
+        val light = Theme(
+            materialColors = lightColors(
+                background = Color(0xFFF5F5F5),
+                surface = Color(0xFFFFFFFF)
+            ),
+            colors = ExtendedColors(
+                codeGuide = Color(0xFF8E9294)
+            ),
+            code = CodeStyle(
+                simple = SpanStyle(Color(0xFF000000)),
+                value = SpanStyle(Color(0xFF4A86E8)),
+                keyword = SpanStyle(Color(0xFF000080)),
+                punctuation = SpanStyle(Color(0xFFA1A1A1)),
+                annotation = SpanStyle(Color(0xFFBBB529)),
+                comment = SpanStyle(Color(0xFF808080))
+            )
         )
     }
+}
+
+val LocalTheme = staticCompositionLocalOf { Theme.dark }
+
+val AppTheme
+    @Composable
+    get() = LocalTheme.current

examples/codeviewer/shared/src/commonMain/kotlin/org/jetbrains/codeviewer/ui/editor/EditorTabsView.kt

@@ -10,6 +10,7 @@ import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.material.Icon
 import androidx.compose.material.LocalContentColor
+import androidx.compose.material.MaterialTheme
 import androidx.compose.material.Surface
 import androidx.compose.material.Text
 import androidx.compose.material.icons.Icons
@@ -21,7 +22,6 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
-import org.jetbrains.codeviewer.ui.common.AppTheme
 
 @Composable
 fun EditorTabsView(model: Editors) = Row(Modifier.horizontalScroll(rememberScrollState())) {
@@ -33,7 +33,7 @@ fun EditorTabsView(model: Editors) = Row(Modifier.horizontalScroll(rememberScrol
 @Composable
 fun EditorTabView(model: Editor) = Surface(
     color = if (model.isActive) {
-        AppTheme.colors.backgroundDark
+        MaterialTheme.colors.background
     } else {
         Color.Transparent
     }

examples/codeviewer/shared/src/commonMain/kotlin/org/jetbrains/codeviewer/ui/editor/EditorView.kt

@@ -1,13 +1,22 @@
 package org.jetbrains.codeviewer.ui.editor
 
 import androidx.compose.foundation.background
-import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.offset
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.rememberLazyListState
 import androidx.compose.foundation.text.selection.DisableSelection
 import androidx.compose.foundation.text.selection.SelectionContainer
 import androidx.compose.material.CircularProgressIndicator
 import androidx.compose.material.LocalContentColor
+import androidx.compose.material.MaterialTheme
 import androidx.compose.material.Surface
 import androidx.compose.material.Text
 import androidx.compose.runtime.Composable
@@ -37,7 +46,7 @@ fun EditorView(model: Editor, settings: Settings) = key(model) {
         SelectionContainer {
             Surface(
                 Modifier.fillMaxSize(),
-                color = AppTheme.colors.backgroundDark,
+                color = MaterialTheme.colors.background,
             ) {
                 val lines by loadableScoped(model.lines)
 
@@ -51,7 +60,7 @@ fun EditorView(model: Editor, settings: Settings) = key(model) {
                                 )
                                 .width(1.dp)
                                 .fillMaxHeight()
-                                .background(AppTheme.colors.backgroundLight)
+                                .background(AppTheme.colors.codeGuide)
                         )
                     }
                 } else {
@@ -143,6 +152,7 @@ private fun LineContent(content: Editor.Content, modifier: Modifier, settings: S
     softWrap = false
 )
 
+@Composable
 private fun codeString(str: String) = buildAnnotatedString {
     withStyle(AppTheme.code.simple) {
         val strFormatted = str.replace("\t", "    ")

examples/codeviewer/shared/src/commonMain/kotlin/org/jetbrains/codeviewer/ui/statusbar/StatusBar.kt

@@ -1,6 +1,12 @@
 package org.jetbrains.codeviewer.ui.statusbar
 
-import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.width
 import androidx.compose.material.LocalContentColor
 import androidx.compose.material.Slider
 import androidx.compose.material.Text
@@ -9,7 +15,11 @@ import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalDensity
-import androidx.compose.ui.unit.*
+import androidx.compose.ui.unit.Density
+import androidx.compose.ui.unit.TextUnit
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.lerp
+import androidx.compose.ui.unit.sp
 import org.jetbrains.codeviewer.ui.common.Settings
 
 private val MinFontSize = 6.sp
@@ -18,7 +28,6 @@ private val MaxFontSize = 40.sp
 @Composable
 fun StatusBar(settings: Settings) = Box(
     Modifier
-        .padding(16.dp, 4.dp, 16.dp, 16.dp)
         .height(32.dp)
         .fillMaxWidth()
 ) {

examples/codeviewer/shared/src/commonMain/kotlin/org/jetbrains/codeviewer/util/VerticalSplittable.kt

@@ -7,6 +7,7 @@ import androidx.compose.foundation.gestures.rememberDraggableState
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.width
+import androidx.compose.material.MaterialTheme
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
@@ -19,7 +20,6 @@ import androidx.compose.ui.unit.Constraints
 import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.dp
 import org.jetbrains.codeviewer.platform.cursorForHorizontalResize
-import org.jetbrains.codeviewer.ui.common.AppTheme
 
 @Composable
 fun VerticalSplittable(
@@ -60,7 +60,7 @@ class SplitterState {
 fun VerticalSplitter(
     splitterState: SplitterState,
     onResize: (delta: Dp) -> Unit,
-    color: Color = AppTheme.colors.backgroundDark
+    color: Color = MaterialTheme.colors.background
 ) = Box {
     val density = LocalDensity.current
     Box(

examples/codeviewer/shared/src/iosMain/resources/EditorView.kt

@@ -48,7 +48,7 @@ fun EditorView(model: Editor, settings: Settings) = key(model) {
                                 )
                                 .width(1.dp)
                                 .fillMaxHeight()
-                                .background(AppTheme.colors.backgroundLight)
+                                .background(AppTheme.colors.codeGuide)
                         )
                     }
                 } else {