本節介紹Qt常用布局管理，QSplitter類、QDockWidget類和QStackedWidget類。

QSplitter類

#include "widget.h"
#include <QApplication>
#include <QSplitter>
#include <QLineEdit>

int main(int argc, char *argv[]) {
  QApplication a(argc, argv);
  QSplitter *splitterMain = new QSplitter(Qt::Horizontal, 0);

  QSplitter 
 
*splitterLeft = new QSplitter(Qt::Vertical, splitterMain);
  QLineEdit *lineEditRight = new QLineEdit("Right LineEdit", splitterMain);

  QSplitter *splitterUp = new QSplitter(Qt::Horizontal, splitterLeft);
  QSplitter *splitterDown = new QSplitter(Qt::Horizontal, splitterLeft);

  QLineEdit *lineEditUp = new
 
 QLineEdit("Up LineEdit", splitterUp);
  QLineEdit *lineEditDown = new QLineEdit("Down LineEdit", splitterDown);

  splitterMain->show();

  //    Widget w;
  //    w.show();

  return a.exec();
}

編譯，運行結果

QDockWidget類

#include "dockwindow.h"
#include <QDockWidget>
#include <QTextEdit>

DockWindow::DockWindow(QWidget 
 
*parent) : QMainWindow(parent) {
  setWindowTitle(tr("Dock Window"));
  QTextEdit *te = new QTextEdit(this);
  te->setText(tr("Main Text Edit"));
  te->setAlignment(Qt::AlignCenter);
  setCentralWidget(te);

  QDockWidget *dock1 = new QDockWidget(tr("Dock Widget 1"), this);
  dock1->setFeatures(QDockWidget::DockWidgetMovable);
  dock1->setAllowedAreas(Qt::LeftDockWidgetArea | Qt::RightDockWidgetArea);
  QTextEdit *te1 = new QTextEdit();
  te1->setText(tr("Text Edit 1, This Text Edit Widget is Movable!"));
  dock1->setWidget(te1);
  addDockWidget(Qt::RightDockWidgetArea, dock1);

  QDockWidget *dock2 = new QDockWidget(tr("Dock Widget 2"), this);
  dock2->setFeatures(QDockWidget::DockWidgetClosable |
                     QDockWidget::DockWidgetFloatable);
  QTextEdit *te2 = new QTextEdit();
  te2->setText(
      tr("Text Edit 2, This Text Edit Widget is Closable and Floatable!"));
  dock2->setWidget(te2);
  addDockWidget(Qt::RightDockWidgetArea, dock2);

  QDockWidget *dock3 = new QDockWidget(tr("Dock Widget 3"), this);
  dock3->setFeatures(QDockWidget::AllDockWidgetFeatures);
  QTextEdit *te3 = new QTextEdit();
  te3->setText(tr("Text Edit 3, ALL Dock Widget Features!"));
  dock3->setWidget(te3);
  addDockWidget(Qt::RightDockWidgetArea, dock3);
}

編譯，運行

QStackedWidget類

#include "stackdlg.h"
#include <QDialog>
#include <QLabel>
#include <QLayout>
#include <QListWidget>
#include <QStackedWidget>
#include <QWidget>

StackDlg::StackDlg(QWidget *parent) : QDialog(parent) {
  setWindowTitle(tr("StackedWidget"));
  list = new QListWidget(this);
  list->insertItem(0, tr("Window 1"));
  list->insertItem(1, tr("Window 2"));
  list->insertItem(2, tr("Window 3"));

  label1 = new QLabel(tr("Window Test 1"));
  label2 = new QLabel(tr("Window Test 2"));
  label3 = new QLabel(tr("Window Test 3"));

  stack = new QStackedWidget(this);
  stack->addWidget(label1);
  stack->addWidget(label2);
  stack->addWidget(label3);

  QHBoxLayout *mainLayout = new QHBoxLayout(this);
  mainLayout->setMargin(5);
  mainLayout->setSpacing(5);
  mainLayout->addWidget(list);
  mainLayout->addWidget(stack, 0, Qt::AlignHCenter);
  mainLayout->setStretchFactor(list, 1);
  mainLayout->setStretchFactor(stack, 3);

  connect(list, SIGNAL(currentRowChanged(int)), stack,
          SLOT(setCurrentIndex(int)));
}

編譯，運行結果

Qt系列04 布局管理