permissionlesstech/bitchat
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Implement lazy loading for heavy components

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- Add LazyLinkPreviewView wrapper to defer link preview loading
- Only render sidebar content when visible or animating
- Defer expensive computations until components are shown
- Reduces initial render cost and memory usage
This commit is contained in:
jack
2025-07-24 13:46:23 +02:00
parent 2350c48e13
commit c7f0a5ea02
1 changed files with 44 additions and 8 deletions
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bitchat/Views/ContentView.swift
+44 -8
View File
@@ -8,6 +8,31 @@
import SwiftUI
// Lazy loading wrapper for link previews
struct LazyLinkPreviewView: View {
let url: URL
let title: String?
@State private var isVisible = false
var body: some View {
GeometryReader { geometry in
if isVisible {
LinkPreviewView(url: url, title: title)
} else {
// Placeholder while not visible
RoundedRectangle(cornerRadius: 10)
.fill(Color.gray.opacity(0.1))
.frame(height: 80)
.onAppear {
// Only load when view appears on screen
isVisible = true
}
}
}
.frame(height: 80)
}
}
struct ContentView: View {
@EnvironmentObject var viewModel: ChatViewModel
@State private var messageText = ""
@@ -94,13 +119,24 @@ struct ContentView: View {
}
}
sidebarView
#if os(macOS)
.frame(width: min(300, geometry.size.width * 0.4))
#else
.frame(width: geometry.size.width * 0.7)
#endif
.transition(.move(edge: .trailing))
// Only render sidebar content when it's visible or animating
if showSidebar || sidebarDragOffset != 0 {
sidebarView
#if os(macOS)
.frame(width: min(300, geometry.size.width * 0.4))
#else
.frame(width: geometry.size.width * 0.7)
#endif
.transition(.move(edge: .trailing))
} else {
// Empty placeholder when hidden
Color.clear
#if os(macOS)
.frame(width: min(300, geometry.size.width * 0.4))
#else
.frame(width: geometry.size.width * 0.7)
#endif
}
}
.offset(x: showSidebar ? -sidebarDragOffset : geometry.size.width - sidebarDragOffset)
.animation(.easeInOut(duration: 0.25), value: showSidebar)
@@ -217,7 +253,7 @@ struct ContentView: View {
if !urls.isEmpty {
ForEach(urls.prefix(3).indices, id: \.self) { index in
let urlInfo = urls[index]
LinkPreviewView(url: urlInfo.url, title: nil)
LazyLinkPreviewView(url: urlInfo.url, title: nil)
.padding(.top, 3)
.padding(.horizontal, 1)
.id("\(message.id)-\(urlInfo.url.absoluteString)")