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• • 1 計算器初步添加消息響應

1 計算器初步添加消息響應

只需要按照信號與槽的要求進行修改即可，修改后的代碼如下(main.cpp未修改)：

QCalculatorUI.h：

#ifndef _QCALCULATORUI_H_ #define _QCALCULATORUI_H_#include <QWidget> #include <QLineEdit> #include <QPushButton>class QCalculatorUI : public QWidget {Q_OBJECT private:QLineEdit* m_edit;QPushButton* m_buttons[20];QCalculatorUI();bool construct(); private slots:void onButtonClicked(); public:static QCalculatorUI* NewInstance();void show();~QCalculatorUI(); };#endif

QCalculatorUI.cpp：

#include "QCalculatorUI.h" #include <QDebug>QCalculatorUI::QCalculatorUI() : QWidget(NULL, Qt::WindowCloseButtonHint) {}bool QCalculatorUI::construct() {bool ret = true;const char* btnText[20] ={"7", "8", "9", "+", "(","4", "5", "6", "-", ")","1", "2", "3", "*", "<-","0", ".", "=", "/", "C",};m_edit = new QLineEdit(this);if( m_edit != NULL ){m_edit->move(10, 10);m_edit->resize(240, 30);m_edit->setReadOnly(true);m_edit->setAlignment(Qt::AlignRight);}else{ret = false;}for(int i=0; (i<4) && ret; i++){for(int j=0; (j<5) && ret; j++){m_buttons[i*5 + j] = new QPushButton(this);if( m_buttons[i*5 + j] != NULL ){m_buttons[i*5 + j]->resize(40, 40);m_buttons[i*5 + j]->move(10 + (10 + 40)*j, 50 + (10 + 40)*i);m_buttons[i*5 + j]->setText(btnText[i*5 + j]);connect(m_buttons[i*5 + j], SIGNAL(clicked()), this, SLOT(onButtonClicked()));}else{ret = false;}}}return ret; }QCalculatorUI* QCalculatorUI::NewInstance() {QCalculatorUI* ret = new QCalculatorUI();if( (ret == NULL) || !ret->construct() ){delete ret;ret = NULL;}return ret; }void QCalculatorUI::show() {QWidget::show();setFixedSize(width(), height()); }void QCalculatorUI::onButtonClicked() {QPushButton* btn = (QPushButton*)sender();QString clickText = btn->text();if( clickText == "<-" ){QString text = m_edit->text();if( text.length() > 0 ){text.remove(text.length()-1, 1);m_edit->setText(text);}}else if( clickText == "C" ){m_edit->setText("");}else if( clickText == "=" ){}else{m_edit->setText(m_edit->text() + clickText);} }QCalculatorUI::~QCalculatorUI() {}

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參考資料：

QT實驗分析教程

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