计算器

文件：

• demos/declarative/calculator/calculator.svg
• demos/declarative/calculator/qml/calculator/calculator.qml
• demos/declarative/calculator/qml/calculator/CalculatorCore/Button.qml
• demos/declarative/calculator/qml/calculator/CalculatorCore/Display.qml
• demos/declarative/calculator/qml/calculator/CalculatorCore/calculator.js
• demos/declarative/calculator/main.cpp
• demos/declarative/calculator/calculator.pro
• demos/declarative/calculator/calculator.qmlproject
• demos/declarative/calculator/qml/calculator/CalculatorCore/qmldir