Improve controller behavior and update project requirements

移动端相关内容/安卓app/安卓程序源代码/sharedUi/src/commonMain/kotlin/org/qimiaoscreen/ui/ControllerApp.kt

@@ -78,10 +78,18 @@ fun QimiaoApp(controller: Controller, onScan: () -> Unit, decode: (String) -> Im
         if (dialog == "settings") {
             var name by remember { mutableStateOf(state.clientName) }
             AlertDialog(onDismissRequest = { dialog = null }, title = { Text("软件设置") },
-                text = { OutlinedTextField(name, { name = it.take(40) }, label = { Text("当前手机昵称") }, singleLine = true) },
+                text = { Column(verticalArrangement = Arrangement.spacedBy(12.dp)) {
+                    OutlinedTextField(name, { name = it.take(40) }, label = { Text("当前手机昵称") }, singleLine = true)
+                    Text("内容缓存：${state.cacheBytes / 1024} KiB")
+                    TextButton({ dialog = "clear-cache" }, Modifier.testTag("cache_clear_open")) { Text("清空内容缓存") }
+                } },
                 confirmButton = { TextButton({ controller.renamePhone(name); if (name.trim().isNotEmpty()) dialog = null }, enabled = !state.busy) { Text("保存") } },
                 dismissButton = { TextButton({ dialog = null }) { Text("取消") } })
         }
+        if (dialog == "clear-cache") AlertDialog(onDismissRequest = { dialog = "settings" }, title = { Text("清空内容缓存") },
+            text = { Text("删除本机保存的内容列表、预览图和完整图。再次打开显示内容时会重新从设备获取。") },
+            confirmButton = { TextButton({ controller.clearContentCache(); dialog = null }, Modifier.testTag("cache_clear_confirm")) { Text("清空") } },
+            dismissButton = { TextButton({ dialog = "settings" }) { Text("取消") } })
     }
 }
 
@@ -172,8 +180,8 @@ private fun ContentPage(state: ControllerState, c: Controller, decode: (String)
         item { Text("可播放内容", style = MaterialTheme.typography.titleLarge) }
         items(state.library, key = { it.text("type") + it.text("id") }) { item ->
             val key = thumbnailKey(item)
-            LaunchedEffect(key) { c.thumbnail(item) }
-            val encoded = state.thumbnails[key]
+            val encoded = state.thumbnails[key] ?: state.previews[key]
+            LaunchedEffect(key, encoded) { c.thumbnail(item) }
             val image = remember(encoded) { encoded?.let(decode) }
             Card(Modifier.fillMaxWidth()) { Column(Modifier.padding(12.dp)) {
                 Row(horizontalArrangement = Arrangement.spacedBy(12.dp)) { if (image != null) Image(image, item.text("name"), Modifier.size(64.dp)); Text(item.text("name")) }