ImageVIewer. Don't show splash screen on click on refresh button

examples/imageviewer/common/src/desktopMain/kotlin/example/imageviewer/model/DesktopContentState.kt

@@ -27,7 +27,7 @@ object ContentState {
         }
         this.uriRepository = uriRepository
         repository = ImageRepository(uriRepository)
-        isAppUIReady.value = false
+        isContentReady.value = false
 
         initData()
 
@@ -36,9 +36,14 @@ object ContentState {
 
     private val executor: ExecutorService by lazy { Executors.newFixedThreadPool(2) }
 
-    private val isAppUIReady = mutableStateOf(false)
+    private val isAppReady = mutableStateOf(false)
+    fun isAppReady(): Boolean {
+        return isAppReady.value
+    }
+
+    private val isContentReady = mutableStateOf(false)
     fun isContentReady(): Boolean {
-        return isAppUIReady.value
+        return isContentReady.value
     }
 
     // drawable content
@@ -124,7 +129,7 @@ object ContentState {
 
     // application content initialization
     private fun initData() {
-        if (isAppUIReady.value)
+        if (isContentReady.value)
             return
 
         val directory = File(cacheImagePath)
@@ -142,7 +147,7 @@ object ContentState {
                             showPopUpMessage(
                                 ResString.repoInvalid
                             )
-                            isAppUIReady.value = true
+                            onContentReady()
                         }
                         return@execute
                     }
@@ -154,7 +159,7 @@ object ContentState {
                             showPopUpMessage(
                                 ResString.repoEmpty
                             )
-                            isAppUIReady.value = true
+                            onContentReady()
                         }
                     } else {
                         val picture = loadFullImage(imageList[0])
@@ -168,7 +173,7 @@ object ContentState {
                                 appliedFilters.add(mainImageWrapper.getFilters())
                                 currentImageIndex.value = mainImageWrapper.getId()
                             }
-                            isAppUIReady.value = true
+                            onContentReady()
                         }
                     }
                 } else {
@@ -176,7 +181,7 @@ object ContentState {
                         showPopUpMessage(
                             ResString.noInternet
                         )
-                        isAppUIReady.value = true
+                        onContentReady()
                     }
                 }
             } catch (e: Exception) {
@@ -191,7 +196,7 @@ object ContentState {
     }
 
     fun fullscreen(picture: Picture) {
-        isAppUIReady.value = false
+        isContentReady.value = false
         AppState.screenState(ScreenType.FullscreenImage)
         setMainImage(picture)
     }
@@ -199,7 +204,7 @@ object ContentState {
     fun setMainImage(picture: Picture) {
         if (mainImageWrapper.getId() == picture.id) {
             if (!isContentReady()) {
-                isAppUIReady.value = true
+                onContentReady()
             }
             return
         }
@@ -211,7 +216,7 @@ object ContentState {
                     val fullSizePicture = loadFullImage(picture.source)
                     fullSizePicture.id = picture.id
                     wrapPictureIntoMainImage(fullSizePicture)
-                    isAppUIReady.value = true
+                    onContentReady()
                 }
             } else {
                 invokeLater {
@@ -219,12 +224,17 @@ object ContentState {
                         "${ResString.noInternet}\n${ResString.loadImageUnavailable}"
                     )
                     wrapPictureIntoMainImage(picture)
-                    isAppUIReady.value = true
+                    onContentReady()
                 }
             }
         }
     }
 
+    private fun onContentReady() {
+        isContentReady.value = true
+        isAppReady.value = true
+    }
+
     private fun wrapPictureIntoMainImage(picture: Picture) {
         mainImageWrapper.wrapPicture(picture)
         mainImageWrapper.saveOrigin()
@@ -258,7 +268,7 @@ object ContentState {
                 invokeLater {
                     clearCache()
                     miniatures.clear()
-                    isAppUIReady.value = false
+                    isContentReady.value = false
                     initData()
                 }
             } else {

examples/imageviewer/common/src/desktopMain/kotlin/example/imageviewer/view/MainScreen.kt

@@ -13,6 +13,7 @@ import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.offset
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.preferredHeight
 import androidx.compose.foundation.layout.preferredSize
@@ -21,6 +22,7 @@ import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.rememberScrollbarAdapter
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.material.Card
+import androidx.compose.material.CircularProgressIndicator
 import androidx.compose.material.Divider
 import androidx.compose.material.MaterialTheme
 import androidx.compose.material.Surface
@@ -56,11 +58,37 @@ import example.imageviewer.utils.toByteArray
 
 @Composable
 fun setMainScreen(content: ContentState) {
-    check(content.isContentReady())
+    if (content.isContentReady()) {
         Column {
             setTopContent(content)
             setScrollableArea(content)
         }
+    } else {
+        setLoadingScreen(content)
+    }
+}
+
+@Composable
+private fun setLoadingScreen(content: ContentState) {
+    Box {
+        Column {
+            setTopContent(content)
+        }
+        Box(modifier = Modifier.align(Alignment.Center)) {
+            Surface(color = DarkGray, elevation = 4.dp, shape = CircleShape) {
+                CircularProgressIndicator(
+                    modifier = Modifier.preferredSize(50.dp).padding(3.dp, 3.dp, 4.dp, 4.dp),
+                    color = DarkGreen
+                )
+            }
+        }
+        Text(
+            text = ResString.loading,
+            modifier = Modifier.align(Alignment.Center).offset(0.dp, 70.dp),
+            style = MaterialTheme.typography.body1,
+            color = Foreground
+        )
+    }
 }
 
 @Composable

examples/imageviewer/desktop/src/jvmMain/kotlin/example/imageviewer/Main.kt

@@ -0,0 +1,48 @@
+package example.imageviewer
+
+import androidx.compose.desktop.DesktopTheme
+import androidx.compose.material.MaterialTheme
+import androidx.compose.runtime.remember
+import example.imageviewer.model.ContentState
+import example.imageviewer.style.icAppRounded
+import example.imageviewer.utils.Application
+import example.imageviewer.utils.getPreferredWindowSize
+import example.imageviewer.view.BuildAppUI
+import example.imageviewer.view.SplashUI
+
+fun main() = Application {
+    val content = remember {
+        ContentState.applyContent(
+            "https://raw.githubusercontent.com/JetBrains/compose-jb/master/artwork/imageviewerrepo/fetching.list"
+        )
+    }
+
+    val icon = remember(::icAppRounded)
+
+    if (content.isAppReady()) {
+        ComposableWindow(
+            title = "Image Viewer",
+            size = getPreferredWindowSize(800, 1000),
+            icon = icon
+        ) {
+            MaterialTheme {
+                DesktopTheme {
+                    BuildAppUI(content)
+                }
+            }
+        }
+    } else {
+        ComposableWindow(
+            title = "Image Viewer",
+            size = getPreferredWindowSize(800, 300),
+            undecorated = true,
+            icon = icon,
+        ) {
+            MaterialTheme {
+                DesktopTheme {
+                    SplashUI()
+                }
+            }
+        }
+    }
+}

examples/imageviewer/desktop/src/jvmMain/kotlin/imageviewer/Main.kt

@@ -1,48 +0,0 @@
-package example.imageviewer
-
-import androidx.compose.desktop.DesktopTheme
-import androidx.compose.material.MaterialTheme
-import androidx.compose.runtime.remember
-import example.imageviewer.model.ContentState
-import example.imageviewer.style.icAppRounded
-import example.imageviewer.utils.Application
-import example.imageviewer.utils.getPreferredWindowSize
-import example.imageviewer.view.BuildAppUI
-import example.imageviewer.view.SplashUI
-
-fun main() {
-    val content = ContentState.applyContent(
-        "https://raw.githubusercontent.com/JetBrains/compose-jb/master/artwork/imageviewerrepo/fetching.list"
-    )
-
-    Application {
-        val icon = remember(::icAppRounded)
-
-        if (content.isContentReady()) {
-            ComposableWindow(
-                title = "Image Viewer",
-                size = getPreferredWindowSize(800, 1000),
-                icon = icon
-            ) {
-                MaterialTheme {
-                    DesktopTheme {
-                        BuildAppUI(content)
-                    }
-                }
-            }
-        } else {
-            ComposableWindow(
-                title = "Image Viewer",
-                size = getPreferredWindowSize(800, 300),
-                undecorated = true,
-                icon = icon,
-            ) {
-                MaterialTheme {
-                    DesktopTheme {
-                        SplashUI()
-                    }
-                }
-            }
-        }
-    }
-}