［QT］初识

    昨日はQTを始めて使いました。楽しい感じがしました。MFCより、QTのほどが易しそうです。

　虽然说，对QT有了初步了解，但是有许多问题还没搞清楚，列个清单

   1：何谓 交叉编译

   2：qmake -project      qmake     make  到底为何物。

   3：QT的发展历史

   記念するので、下記は私の始めのQTアプリケーション。

#ifndef DIGITALCLOCK_H
#define DIGITALCLOCK_H
#include <QDialog>
class QLabel;
class QLineEdit;
class QPushButton;
class DigitalClock : public QDialog
{
  Q_OBJECT
public:
  DigitalClock(QWidget *parent = 0);
private slots:
  void Start();
  void Reset();
private:
  QLabel *label_A;
  QLabel *label_B;
  QLabel *label_Amis;
  QLabel *label_Bmis;
  QLabel *label_Speed;
  QLineEdit *lineEdit_A;
  QLineEdit *lineEdit_B;
  QLineEdit *lineEdit_Amis;
  QLineEdit *lineEdit_Bmis;
  QLineEdit *lineEdit_Speed;
  QPushButton *pushButton_Start;
  QPushButton *pushButton_Reset;
};
#endif

#include <QtGui>
#include "DigitalClock.h"
DigitalClock::DigitalClock(QWidget *parent)
  : QDialog(parent)
{
  label_A = new QLabel(tr("Position A"));
  lineEdit_A = new QLineEdit(tr("12.0"));
  label_A->setBuddy(lineEdit_A);
  label_B = new QLabel(tr("Position B"));
  lineEdit_B = new QLineEdit(tr("12.0"));
  label_B->setBuddy(lineEdit_B);
  label_Amis = new QLabel(tr("Partial volume A"));
  lineEdit_Amis = new QLineEdit(tr("0"));
  label_Amis->setBuddy(lineEdit_Amis);
  label_Bmis = new QLabel(tr("Partial volume B"));
  lineEdit_Bmis = new QLineEdit(tr("0"));
  label_Bmis->setBuddy(lineEdit_Bmis);
  label_Speed = new QLabel(tr("Rotate Speed")); 
  lineEdit_Speed = new QLineEdit(tr("2.19"));
  label_Speed->setBuddy(lineEdit_Speed);
  pushButton_Start = new QPushButton(tr("Start"));
  pushButton_Reset = new QPushButton(tr("Reset"));
  connect(pushButton_Start, SIGNAL(clicked()), this, SLOT(Start()));
  connect(pushButton_Reset, SIGNAL(clicked()), this, SLOT(Reset()));
  
  QVBoxLayout *leftLayout = new QVBoxLayout;
  leftLayout->addWidget(label_A);
  leftLayout->addWidget(lineEdit_A);
  leftLayout->addWidget(label_Amis);
  leftLayout->addWidget(lineEdit_Amis);
  QVBoxLayout* middleLayout = new QVBoxLayout;
  middleLayout->addWidget(label_Speed);
  middleLayout->addWidget(lineEdit_Speed);
  middleLayout->addWidget(pushButton_Start);
  middleLayout->addWidget(pushButton_Reset);
  QVBoxLayout* rightLayout = new QVBoxLayout;
  rightLayout->addWidget(label_B);
  rightLayout->addWidget(lineEdit_B);
  rightLayout->addWidget(label_Bmis);
  rightLayout->addWidget(lineEdit_Bmis);
  QHBoxLayout* mainLayout = new QHBoxLayout;
  mainLayout->addLayout(leftLayout);
  mainLayout->addLayout(middleLayout);
  mainLayout->addLayout(rightLayout);
  setLayout(mainLayout);
  setWindowTitle(tr("Find"));
  setFixedHeight(sizeHint().height());
}
void DigitalClock::Start()
{
  srand(time(NULL));
  float fA = rand() % 120 / 10;
  float fB = rand() % 120 / 10;
  int iAmis = rand() % 30 + 70;
  int iBmis = rand() % 30 + 70;
  
  QString str = QString("%1").arg(iAmis);
  lineEdit_Amis->setText(str);
  
  str.sprintf("%d", iBmis);
  lineEdit_Bmis->setText(str);
  str.sprintf("%0.1f", fA);
  lineEdit_A->setText(str);
  
  str.sprintf("%0.1f", fB);
  lineEdit_B->setText(str);
}
void DigitalClock::Reset()
{
  lineEdit_A->setText(tr("12.0"));
  lineEdit_B->setText(tr("12.0"));
  lineEdit_Speed->setText(tr("0.00"));
  lineEdit_Amis->setText(tr("0"));
  lineEdit_Bmis->setText(tr("0"));
}

#include <QApplication>
#include "DigitalClock.h"
int main(int argc, char** argv)
{
  QApplication app(argc, argv);
  DigitalClock *dialog = new DigitalClock;
  dialog->show();
  return app.exec();
}

結果の図は以下です。