Day3 教学示例：增强版计算器接入 + QMainWindow/QSS 两版参考实现
- calculator_designer_ext（Day2 增强版：表达式求值 + 括号，递归下降解析器）接入 cmake - calculator_mainwindow（Day3 上午）：增强版计算器装进 QMainWindow， 菜单/状态栏/历史停靠窗，纯代码 + 显式 connect，与 mainwindow_showcase 形成坑卡对照 - calculator_mainwindow_qss（Day3 下午）：上午版 + QSS 双主题美化（按键分色/伪状态/深浅切换） - 验证 mainwindow_showcase（QMainWindow 六大组件综合演示，.ui + .qrc） - OUTLINE_4DAY.md / ASSIGNMENTS.md Day3 衔接增强版起点 + 参考实现指引 - 补提交 Day2 calculator/ 与 calculator_designer/ 参考实现（CMakeLists 已引用） - 全量构建 28/28，4 目标离屏自测退出码 0 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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张宗平
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<?xml version="1.0" encoding="UTF-8"?>
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<ui version="4.0">
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<class>MainWindow</class>
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<widget class="QMainWindow" name="MainWindow">
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<property name="geometry">
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<rect>
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<x>0</x>
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<y>0</y>
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<width>720</width>
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<height>480</height>
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</rect>
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</property>
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<property name="windowTitle">
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<string>QMainWindow 教学综合示例</string>
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</property>
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<property name="windowIcon">
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<iconset resource="mainwindow.qrc">
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<normaloff>:/icons/app.png</normaloff>:/icons/app.png</iconset>
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</property>
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<!-- 5.5 中心部件：QTextEdit（编辑器主体） -->
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<widget class="QWidget" name="centralwidget">
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<layout class="QVBoxLayout" name="centralLayout">
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<property name="spacing">
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<number>0</number>
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</property>
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<property name="leftMargin">
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<number>0</number>
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</property>
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<property name="topMargin">
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<number>0</number>
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</property>
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<property name="rightMargin">
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<number>0</number>
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</property>
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<property name="bottomMargin">
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<number>0</number>
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</property>
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<item>
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<widget class="QTextEdit" name="textEdit">
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<property name="plainText">
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<string>欢迎使用 QMainWindow 教学综合示例。
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在这里编辑文字，状态栏会实时显示光标行列与字数。
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视图菜单可操控工具栏、状态栏与浮动窗口。</string>
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</property>
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</widget>
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</item>
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</layout>
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</widget>
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<!-- 5.1 菜单栏：文件 / 视图 / 帮助 -->
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<widget class="QMenuBar" name="menubar">
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<property name="geometry">
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<rect>
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<x>0</x>
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<y>0</y>
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<width>720</width>
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<height>22</height>
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</rect>
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</property>
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<widget class="QMenu" name="menuFile">
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<property name="title">
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<string>文件(&F)</string>
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</property>
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<addaction name="actionNew"/>
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<addaction name="actionQuit"/>
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</widget>
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<widget class="QMenu" name="menuView">
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<property name="title">
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<string>视图(&V)</string>
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</property>
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<widget class="QMenu" name="menuToolBarArea">
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<property name="title">
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<string>工具栏停靠区(&A)</string>
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</property>
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<addaction name="actionToolBarAreaLeft"/>
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<addaction name="actionToolBarAreaRight"/>
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<addaction name="actionToolBarAreaTop"/>
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<addaction name="actionToolBarAreaBottom"/>
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<addaction name="actionToolBarAreaAll"/>
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</widget>
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<addaction name="actionToggleToolBar"/>
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<addaction name="actionToggleStatusBar"/>
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<addaction name="actionToggleToolBarMovable"/>
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<addaction name="actionToggleDockFloating"/>
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<addaction name="actionShowDock"/>
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<addaction name="actionHideDock"/>
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<addaction name="menuToolBarArea"/>
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</widget>
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<widget class="QMenu" name="menuHelp">
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<property name="title">
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<string>帮助(&H)</string>
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</property>
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<addaction name="actionAbout"/>
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</widget>
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<addaction name="menuFile"/>
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<addaction name="menuView"/>
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<addaction name="menuHelp"/>
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</widget>
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<!-- 5.3 状态栏（.ui 占位，永久标签在 .cpp 用 addPermanentWidget 添加） -->
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<widget class="QStatusBar" name="statusbar"/>
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<!-- 5.2 工具栏：复用同一批 QAction（QAction 是菜单项与工具按钮的公共抽象） -->
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<widget class="QToolBar" name="mainToolBar">
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<property name="windowTitle">
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<string>主工具栏</string>
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</property>
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<attribute name="toolBarArea">
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<enum>TopToolBarArea</enum>
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</attribute>
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<attribute name="toolBarBreak">
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<bool>false</bool>
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</attribute>
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<addaction name="actionNew"/>
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<addaction name="actionQuit"/>
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<addaction name="actionToggleDockFloating"/>
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<addaction name="actionAbout"/>
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</widget>
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<!-- 5.4 铆接部件（浮动窗口）：可拖出浮动、停靠到边缘 -->
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<widget class="QDockWidget" name="dockWidget">
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<property name="windowTitle">
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<string>浮动窗口</string>
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</property>
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<attribute name="dockWidgetArea">
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<number>1</number>
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</attribute>
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<widget class="QWidget" name="dockContent">
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<layout class="QVBoxLayout" name="dockLayout">
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<item>
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<widget class="QLabel" name="dockLabel">
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<property name="text">
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<string>我是浮动窗口（QDockWidget，5.4 铆接部件）。
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可拖出浮动，也可停靠到主窗口边缘。
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视图菜单的「停靠窗口浮动/停靠」可切换我的状态。</string>
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</property>
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<property name="wordWrap">
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<bool>true</bool>
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</property>
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</widget>
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</item>
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</layout>
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</widget>
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</widget>
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<!-- 5.1 QAction：菜单项与工具按钮的公共抽象。图标取自 5.6 资源文件 -->
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<action name="actionNew">
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<property name="icon">
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<iconset resource="mainwindow.qrc">
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<normaloff>:/icons/new.png</normaloff>:/icons/new.png</iconset>
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</property>
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<property name="text">
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<string>新建</string>
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</property>
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<property name="shortcut">
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<string>Ctrl+N</string>
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</property>
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<property name="statusTip">
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<string>清空编辑区（5.5 中心部件）</string>
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</property>
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</action>
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<action name="actionQuit">
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<property name="icon">
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<iconset resource="mainwindow.qrc">
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<normaloff>:/icons/quit.png</normaloff>:/icons/quit.png</iconset>
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</property>
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<property name="text">
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<string>退出</string>
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</property>
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<property name="shortcut">
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<string>Ctrl+Q</string>
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</property>
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<property name="statusTip">
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<string>退出程序</string>
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</property>
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</action>
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<action name="actionToggleToolBar">
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<property name="checkable">
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<bool>true</bool>
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</property>
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<property name="checked">
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<bool>true</bool>
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</property>
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<property name="text">
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<string>显示主工具栏</string>
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</property>
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<property name="statusTip">
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<string>显示或隐藏主工具栏（5.2 工具栏）</string>
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</property>
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</action>
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<action name="actionToggleStatusBar">
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<property name="checkable">
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<bool>true</bool>
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</property>
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<property name="checked">
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<bool>true</bool>
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</property>
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<property name="text">
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<string>显示状态栏</string>
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</property>
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<property name="statusTip">
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<string>显示或隐藏状态栏（5.3 状态栏）</string>
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</property>
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</action>
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<action name="actionToggleToolBarMovable">
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<property name="checkable">
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<bool>true</bool>
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</property>
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<property name="checked">
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<bool>true</bool>
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</property>
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<property name="text">
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<string>工具栏可移动</string>
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</property>
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<property name="statusTip">
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<string>切换工具栏是否可拖动（5.2 setMovable）</string>
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</property>
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</action>
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<action name="actionToggleDockFloating">
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<property name="icon">
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<iconset resource="mainwindow.qrc">
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<normaloff>:/icons/dock.png</normaloff>:/icons/dock.png</iconset>
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</property>
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<property name="text">
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<string>停靠窗口浮动/停靠</string>
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</property>
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<property name="statusTip">
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<string>切换浮动窗口的浮动状态（5.4 setFloating）</string>
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</property>
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</action>
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<action name="actionShowDock">
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<property name="text">
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<string>显示浮动窗口</string>
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</property>
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<property name="statusTip">
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<string>重新显示已关闭的浮动窗口（5.4 show）</string>
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</property>
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</action>
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<action name="actionHideDock">
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<property name="text">
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<string>关闭浮动窗口</string>
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</property>
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<property name="statusTip">
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<string>隐藏浮动窗口（5.4 hide）</string>
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</property>
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</action>
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<action name="actionToolBarAreaLeft">
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<property name="text">
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<string>停靠左侧</string>
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</property>
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<property name="statusTip">
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<string>限制工具栏只能停靠左侧（5.2 setAllowedAreas）</string>
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</property>
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</action>
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<action name="actionToolBarAreaRight">
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<property name="text">
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<string>停靠右侧</string>
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</property>
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<property name="statusTip">
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<string>限制工具栏只能停靠右侧</string>
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</property>
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</action>
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<action name="actionToolBarAreaTop">
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<property name="text">
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<string>停靠顶部</string>
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</property>
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<property name="statusTip">
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<string>限制工具栏只能停靠顶部</string>
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</property>
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</action>
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<action name="actionToolBarAreaBottom">
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<property name="text">
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<string>停靠底部</string>
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</property>
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<property name="statusTip">
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<string>限制工具栏只能停靠底部</string>
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</property>
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</action>
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<action name="actionToolBarAreaAll">
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<property name="text">
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<string>允许全部区域</string>
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</property>
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<property name="statusTip">
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<string>工具栏允许停靠在任意区域</string>
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</property>
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</action>
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<action name="actionAbout">
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<property name="icon">
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<iconset resource="mainwindow.qrc">
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<normaloff>:/icons/about.png</normaloff>:/icons/about.png</iconset>
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</property>
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<property name="text">
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<string>关于</string>
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</property>
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<property name="statusTip">
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<string>关于本程序</string>
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</property>
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</action>
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</widget>
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<resources>
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<include location="mainwindow.qrc"/>
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</resources>
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<connections/>
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</ui>
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