AbsTradELic

ESTUDO DE CASO EM QT
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1- CRIAR DIRETÓRIO: login_dialog
2- CRIAR OS ARQUIVOS NO DIRETÓRIO: login_dialog
3- TOTAL DE ARQUIVOS: 3 ARQUIVOS.

ARQUIVO FONTE 1: login_dialog.h
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#ifndef LOGINDIALOG_H
#define LOGINDIALOG_H

#include <QDialog>

class QLabel;
class QLineEdit;
class QPushButton;

class LoginDialog: public QDialog
{
  Q_OBJECT

public:
  LoginDialog(QWidget *parent = 0);

private slots:
  void okClicked();
  void enableOkButton(const QString &text);

private:
  QLabel *label;
  QLineEdit *lineEdit;
  QPushButton *okButton;
  QPushButton *cancelButton;
};

#endif

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ARQUIVO FONTE 2: login_dialog.cpp
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#include <QtGui>

#include "login_dialog.h"

LoginDialog::LoginDialog(QWidget *parent): QDialog(parent)
{
  label = new QLabel(tr("Login:"));
  lineEdit = new QLineEdit;
  label->setBuddy(lineEdit);

  okButton = new QPushButton(tr("&Ok"));
  okButton->setDefault(true);
  okButton->setEnabled(false);

  cancelButton = new QPushButton(tr("Cancelar"));

  connect(lineEdit, SIGNAL(textChanged(const QString &)), this, SLOT(enableOkButton(const QString &)));
  connect(okButton, SIGNAL(clicked()), this, SLOT(okClicked()));
  connect(cancelButton, SIGNAL(clicked()), this, SLOT(close()));

  QHBoxLayout *topLeftLayout = new QHBoxLayout;
  topLeftLayout->addWidget(label);
  topLeftLayout->addWidget(lineEdit);

  QVBoxLayout *leftLayout = new QVBoxLayout;
  leftLayout->addLayout(topLeftLayout);

  QVBoxLayout *rightLayout = new QVBoxLayout;
  rightLayout->addWidget(okButton);
  rightLayout->addWidget(cancelButton);
  rightLayout->addStretch();

  QHBoxLayout *mainLayout = new QHBoxLayout;
  mainLayout->addLayout(leftLayout);
  mainLayout->addLayout(rightLayout);
  setLayout(mainLayout);

  setWindowTitle(tr("Login"));
  setFixedHeight(sizeHint().height());
}

void LoginDialog::okClicked()
{
  QString text = lineEdit->text();
}


void LoginDialog::enableOkButton(const QString &text)
{
  okButton->setEnabled(!text.isEmpty());
}

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ARQUIVO FONTE 3: main.cpp
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#include <QApplication>

#include "login_dialog.h"

int main(int argc, char *argv[])
{
  QApplication app(argc, argv);
  LoginDialog *dialog = new LoginDialog;
  dialog->show();
  return app.exec();
}

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