C++ GUI Qt4编程(12)-6.1FindFileDialog

1. 主要介绍了QGridLayout, QHBoxLayout, QVBoxLayout3种布局管理器的使用方法。

2. 在linux中，继承自QDialog的对话框，没有最大化、最小化、关闭按钮，如果需要这3个按钮，

需要增加：  setWindowFlags(Qt::Widget);

在windows中，即使不加：setWindowFlags(Qt::Widget); 也会有最大化、最小化、关闭按钮。

3. findfiledialog.h

 /**/
 #ifndef FINDFILEDIALOG_H
 #define FINDFILEDIALOG_H

 #include <QDialog>

 class QLabel;
 class QLineEdit;
 class QPushButton;
 class QCheckBox;
 class QTableWidget;
 class QHBoxLayout;
 class QVBoxLayout;
 class QGridLayout;

 class FindFileDialog : public QDialog
 {
     Q_OBJECT

 public:
     FindFileDialog(QWidget *parent = );

 private:
     QLabel *namedLabel;
     QLabel *lookInLabel;
     QLineEdit *namedLineEdit;
     QLineEdit *lookInLineEdit;
     QCheckBox *subfoldersCheckBox;
     QTableWidget *tableWidget;
     QLabel *messageLabel;

     QPushButton *findButton;
     QPushButton *stopButton;
     QPushButton *closeButton;
     QPushButton *helpButton;

     QGridLayout *leftLayout;
     QVBoxLayout *rightLayout;
     QHBoxLayout *mainLayout;
 };

 #endif

4. findfiledialog.cpp

 /**/
 #include "findfiledialog.h"

 #include <QLabel>
 #include <QLineEdit>
 #include <QPushButton>
 #include <QCheckBox>
 #include <QTableWidget>
 #include <QHBoxLayout>
 #include <QVBoxLayout>
 #include <QGridLayout>

 FindFileDialog::FindFileDialog(QWidget *parent)
     : QDialog(parent)
 {
     namedLabel = new QLabel(tr("&Named:"));
     namedLineEdit = new QLineEdit;
     namedLabel->setBuddy(namedLineEdit);

     lookInLabel = new QLabel(tr("&Look in:"));
     lookInLineEdit = new QLineEdit;
     lookInLabel->setBuddy(lookInLineEdit);

     subfoldersCheckBox = new QCheckBox(tr("Include subfolders"));

     QStringList labels;
     labels << tr("Name") << tr("In Folder")
            << tr("Size") << tr("Modified");

     tableWidget = new QTableWidget;
     tableWidget->setColumnCount();
     tableWidget->setHorizontalHeaderLabels(labels);

     messageLabel = new QLabel(tr("0 files found"));
     messageLabel->setFrameShape(QFrame::Panel);
     messageLabel->setFrameShadow(QFrame::Sunken);

     /*  QGridLayout
     void    addWidget(QWidget * widget,
                       int fromRow,int fromColumn,
                       int rowSpan,int columnSpan,
                       Qt::Alignment alignment = 0)
     */
     leftLayout = new QGridLayout;
     leftLayout->addWidget(namedLabel, , );
     leftLayout->addWidget(namedLineEdit, , );
     leftLayout->addWidget(lookInLabel, , );
     leftLayout->addWidget(lookInLineEdit, , );
     /*subfoldersCheckBox的位置坐标(2, 0)，占1行，占2列*/
     leftLayout->addWidget(subfoldersCheckBox, , , , );
     leftLayout->addWidget(tableWidget, , , , );
     leftLayout->addWidget(messageLabel, , , , );

     findButton = new QPushButton(tr("&Find"));
     stopButton = new QPushButton(tr("&Stop"));
     closeButton = new QPushButton(tr("&Close"));
     helpButton = new QPushButton(tr("&Help"));

     connect(closeButton, SIGNAL(clicked()), this, SLOT(close()));

     rightLayout = new QVBoxLayout;
     rightLayout->addWidget(findButton);
     rightLayout->addWidget(stopButton);
     rightLayout->addWidget(closeButton);
     rightLayout->addStretch();
     rightLayout->addWidget(helpButton);

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

     setLayout(mainLayout);
     setWindowTitle(tr("Find Files or Folders"));
     /*在linux中，继承自QDialog的对话框没有最大化最小化和关闭按钮*/
     setWindowFlags(Qt::Widget);     /*在linux中让对话框有最大最小和关闭按钮*/
 }

5. main.cpp

 /**/
 #include <QApplication>
 #include "findfiledialog.h"

 int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);

     FindFileDialog dialog;
     dialog.show();

     return app.exec();
 }

6. 不带关闭按钮：

带关闭按钮：