From 8f144122bc3ae4be21a0d1801467647c96a0e5af Mon Sep 17 00:00:00 2001
From: zhangkun2 <zhangkun2@uniontech.com>
Date: Mon, 14 Sep 2026 19:05:50 +0800
Subject: [PATCH] fix: reduce fullscreen-windowed switch stutter on 4K
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

1. Root cause: dual ApplicationWindow visible-toggle re-renders from
   scratch on 4K; 100ms artificial delay in setCurrentFrameToWindowedFrame
   plus EffectOut startup animation compound main-thread blocking ~2s
2. Fix: replace QTimer::singleShot(100,...) with singleShot(0,...) to
   queue on next event loop iteration without fixed delay; change
   windowStartUpEffect from EffectOut to EffectNone to skip 4K fullscreen
   startup animation rendering
3. Impact: fullscreen-windowed mode switch is faster; fullscreen window
   no longer plays startup animation; potential regression of BUG-323633
   visual glitch needs runtime verification

Log: Reduce launcher mode switch stutter on 4K screens

Influence:
1. Test fullscreen-windowed switch on 4K for stutter improvement
2. Test fullscreen-windowed switch on 1080p for no regression
3. Verify no window flicker or focus loss on fullscreen-windowed switch
4. Verify fullscreen window shows/hides correctly without animation

fix: 降低4K屏幕下全屏窗口模式切换卡顿

1. 根因：双 ApplicationWindow 通过 visible 互斥切换在 4K 下需从零渲染，
   100ms 人工延迟叠加 EffectOut 启动特效渲染导致主线程阻塞约 2s
2. 方案：将 QTimer::singleShot(100,...) 改为 singleShot(0,...)，
   排队到下一事件循环执行无固定延迟；将 windowStartUpEffect 从
   EffectOut 改为 EffectNone，跳过 4K 全屏启动特效渲染
3. 影响：全屏-窗口模式切换速度提升；全屏窗口不再播放启动动画；
   BUG-323633 视觉故障可能回归，需运行时验证

Log: 降低启动器在4K屏幕下模式切换的卡顿

Influence:
1. 在4K分辨率下测试全屏-窗口模式切换卡顿是否改善
2. 在1080p分辨率下测试全屏-窗口模式切换无回归
3. 验证全屏-窗口切换时无窗口闪烁或焦点丢失
4. 验证全屏窗口正常显示/隐藏（无动画过渡）

PMS: BUG-354837
---
 launchercontroller.cpp                         | 2 +-
 qml/Main.qml                                   | 2 +-
 shell-launcher-applet/package/launcheritem.qml | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/launchercontroller.cpp b/launchercontroller.cpp
index 81fac513..4037cf34 100644
--- a/launchercontroller.cpp
+++ b/launchercontroller.cpp
@@ -271,7 +271,7 @@ void LauncherController::showHelp()
 void LauncherController::setCurrentFrameToWindowedFrame()
 {
     setVisible(false);
-    QTimer::singleShot(100, this, [this]() {
+    QTimer::singleShot(0, this, [this]() {
         setCurrentFrame("WindowedFrame");
         setVisible(true);
     });
diff --git a/qml/Main.qml b/qml/Main.qml
index 1276629e..f22af63b 100644
--- a/qml/Main.qml
+++ b/qml/Main.qml
@@ -316,7 +316,7 @@ QtObject {
         DWindow.enableSystemMove: false
         // Fullscreen mode: always assume dark theme
         DWindow.themeType: ApplicationHelper.DarkType
-        DWindow.windowStartUpEffect: PlatformHandle.EffectOut
+        DWindow.windowStartUpEffect: PlatformHandle.EffectNone
 
         onVisibleChanged: {
             if (visible) {
diff --git a/shell-launcher-applet/package/launcheritem.qml b/shell-launcher-applet/package/launcheritem.qml
index 042c5cc8..0e66f040 100644
--- a/shell-launcher-applet/package/launcheritem.qml
+++ b/shell-launcher-applet/package/launcheritem.qml
@@ -227,7 +227,7 @@ AppletItem {
         DWindow.enableSystemMove: false
         // Fullscreen mode: always assume dark theme
         DWindow.themeType: ApplicationHelper.DarkType
-        DWindow.windowStartUpEffect: PlatformHandle.EffectOut
+        DWindow.windowStartUpEffect: PlatformHandle.EffectNone
 
         onVisibleChanged: {
             if (visible) {