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Qt--QMdiArea和QMdiSubWindow的基本用法

2018-06-17 23:35:46来源：未知阅读 ()

大多数复杂的程序，都使用MDI框架，在Qt designer中可以直接将控件MDI Area拖入使用。

QMdiArea一般使用于主窗口中，用于容纳多个子窗口QMdiSubWindow

代码如下：

mainwindow.h

 1 #ifndef MAINWINDOW_H
 2 #define MAINWINDOW_H
 3 
 4 #include <QMainWindow>
 5 #include <QTextEdit>
 6 #include <QLabel>
 7 #include <QMdiSubWindow>
 8 
 9 namespace Ui {
10 class MainWindow;
11 }
12 
13 class MainWindow : public QMainWindow
14 {
15     Q_OBJECT
16 
17 public:
18     explicit MainWindow(QWidget *parent = 0);
19     ~MainWindow();
20 
21 private:
22     Ui::MainWindow *ui;
23     QMdiSubWindow *newwin;
24 
25 private slots:
26     void on_btnCloseAll_clicked();
27     void on_btnClose_clicked();
28     void on_btnNext_clicked();
29     void on_btnPrevious_clicked();
30     void on_btnNewWindow_clicked();
31     void on_btnRemoveWindow_clicked();
32 
33 };
34 
35 #endif // MAINWINDOW_H

mainwindow.cpp

 1 #include "mainwindow.h"
 2 #include "ui_mainwindow.h"
 3 
 4 MainWindow::MainWindow(QWidget *parent) :
 5     QMainWindow(parent),
 6     ui(new Ui::MainWindow)
 7 {
 8     ui->setupUi(this);
 9 
10     //window1
11     QTextEdit *window1 = new QTextEdit;
12     window1->setHtml("C");
13     ui->mdiArea->addSubWindow(window1);     //将window1放进mdiArea框架
14 
15     //window2
16     QTextEdit *window2 = new QTextEdit;
17     window2->setHtml("C++");
18     ui->mdiArea->addSubWindow(window2);
19 
20     //window3
21     QTextEdit *window3 = new QTextEdit;
22     window3->setHtml("Java");
23     ui->mdiArea->addSubWindow(window3);
24 
25     //window4
26     QTextEdit *window4 = new QTextEdit;
27     window4->setHtml("Hello World");
28     ui->mdiArea->addSubWindow(window4);
29 
30     ui->mdiArea->cascadeSubWindows();   //SubWindows重叠排列
31 
32     connect(ui->pushButton_6,SIGNAL(clicked()),this,SLOT(on_btnPrevious_clicked()));
33     connect(ui->pushButton_7,SIGNAL(clicked()),this,SLOT(on_btnNext_clicked()));
34     connect(ui->pushButton_8,SIGNAL(clicked()),this,SLOT(on_btnClose_clicked()));
35     connect(ui->pushButton_9,SIGNAL(clicked()),this,SLOT(on_btnCloseAll_clicked()));
36     connect(ui->pushButton_10,SIGNAL(clicked()),this,SLOT(on_btnNewWindow_clicked()));
37     connect(ui->pushButton_11,SIGNAL(clicked()),this,SLOT(on_btnRemoveWindow_clicked()));
38 }
39 
40 MainWindow::~MainWindow()
41 {
42     delete ui;
43 }
44 
45 void MainWindow::on_btnCloseAll_clicked()
46 {
47     ui->mdiArea->closeAllSubWindows();
48 }
49 
50 void MainWindow::on_btnClose_clicked()
51 {
52     ui->mdiArea->closeActiveSubWindow();
53 }
54 
55 void MainWindow::on_btnNext_clicked()
56 {
57     ui->mdiArea->activateNextSubWindow();
58 }
59 
60 void MainWindow::on_btnPrevious_clicked()
61 {
62     ui->mdiArea->activatePreviousSubWindow();
63 }
64 
65 void MainWindow::on_btnNewWindow_clicked()
66 {
67     newwin = new QMdiSubWindow;
68     newwin->setWindowTitle("test");
69     newwin->setWidget(&QLabel("hey"));
70     newwin->setAttribute(Qt::WA_DeleteOnClose);
71     newwin->resize(200,200);
72     ui->mdiArea->addSubWindow(newwin);
73     newwin->show();     //在非构造函数不加show()，不显示
74     //setActiveSubWindow(QMdiSubWindow *window);     设置active窗口
75 }
76 
77 void MainWindow::on_btnRemoveWindow_clicked()
78 {
79     ui->mdiArea->removeSubWindow(ui->mdiArea->currentSubWindow());   //remove 当前窗口
80 }