1、主窗口中的状态栏
- 状态栏的概念和意义
— 状态栏是应用程序中输出简要信息的区域
— 状态栏一般位于主窗口的最底部
— 状态栏的消息类型
实时消息:如(当前程序状态)
永久消息:如(程序版本号,机构名称)
进度消息:如(进度条提示,百分比提示)
- 在 Qt 中提供与状态栏相关的类组件
- 在 Qt 主窗口中创建状态栏
- Qt 状态栏的设计原则
— 左边的区域用于输出实时消息
— 右边的区域用于设置永久消息
— addWidget
在状态栏的左半部分添加组件
— addPermanentWidget
在状态栏的右半部分添加组件
状态栏初体验:
MainWindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = nullptr);
~MainWindow();
};
#endif // MAINWINDOW_H
MainWindow.cpp
#include "MainWindow.h"
#include <QStatusBar>
#include <QLabel>
#include <QLineEdit>
#include <QPushButton>
MainWindow::MainWindow(QWidget *parent): QMainWindow(parent)
{
QStatusBar* sb = statusBar();
QLabel* label = new QLabel("label");
QLineEdit* edit = new QLineEdit("edit");
QPushButton* btn = new QPushButton("btn");
sb->addPermanentWidget(label);
sb->addPermanentWidget(edit);
sb->addPermanentWidget(btn);
sb->showMessage("xiebs");
}
MainWindow::~MainWindow()
{
}
main.cpp
#include "MainWindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
记事本程序:
MainWindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
class MainWindow : public QMainWindow
{
Q_OBJECT
private:
MainWindow();
MainWindow(const MainWindow& obj);
MainWindow& operator= (const MainWindow& obj);
bool construct();
bool initMenuBar();
bool initToolBar();
bool initStatusBar();
bool initFileMenu(QMenuBar* mb);
bool initEditMenu(QMenuBar* mb);
bool initFormatMenu(QMenuBar* mb);
bool initViewMenu(QMenuBar* mb);
bool initHelpMenu(QMenuBar* mb);
bool initFileToolItem(QToolBar* tb);
bool initEditToolItem(QToolBar* tb);
bool initFormatToolItem(QToolBar* tb);
bool initViewToolItem(QToolBar* tb);
bool makeAction(QAction*& action, QString str, int key);
bool makeAction(QAction*& action, QString tip, QString res);
public:
static MainWindow* NewInstance();
~MainWindow();
};
#endif // MAINWINDOW_H
MainWindow.cpp
#include "MainWindow.h"
#include <QMenuBar>
#include <QMenu>
#include <QAction>
#include <QToolBar>
#include <QIcon>
#include <QSize>
#include <QStatusBar>
#include <QLabel>
MainWindow::MainWindow(): QMainWindow()
{
}
bool MainWindow::construct()
{
bool ret = true;
ret = ret && initMenuBar();
ret = ret && initToolBar();
ret = ret && initStatusBar();
return ret;
}
MainWindow* MainWindow::NewInstance()
{
MainWindow* ret = new MainWindow();
if(!(ret && ret->construct()))
{
delete ret;
ret = nullptr;
}
return ret;
}
bool MainWindow::initMenuBar()
{
bool ret = true;
QMenuBar* mb = menuBar();
if(mb != nullptr)
{
ret = ret && initFileMenu(mb);
ret = ret && initEditMenu(mb);
ret = ret && initFormatMenu(mb);
ret = ret && initViewMenu(mb);
ret = ret && initHelpMenu(mb);
}
else
{
ret = false;
}
return ret;
}
bool MainWindow::initToolBar()
{
bool ret = true;
QToolBar* tb = addToolBar("ToolBar");
tb->setFloatable(false);
tb->setMovable(false);
tb->setIconSize(QSize(16, 16));
ret = ret && initFileToolItem(tb);
tb->addSeparator();
ret = ret && initEditToolItem(tb);
tb->addSeparator();
ret = ret && initFormatToolItem(tb);
tb->addSeparator();
ret = ret && initViewToolItem(tb);
return ret;
}
bool MainWindow::initStatusBar()
{
bool ret = true;
QStatusBar* sb = statusBar();
QLabel* label = new QLabel("D.T.software");
if(label != nullptr)
{
sb->addPermanentWidget(label);
label->setMinimumWidth(40);
label->setAlignment(Qt::AlignCenter);
}
else
{
ret = false;
}
return ret;
}
bool MainWindow::initFileMenu(QMenuBar* mb)
{
QMenu* menu = new QMenu("File(&F)", nullptr);
bool ret = (menu != nullptr);
if(ret)
{
QAction* action = nullptr;
ret = ret && makeAction(action, "New(&N)", Qt::CTRL + Qt::Key_N);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
ret = ret && makeAction(action, "Open(&O)", Qt::CTRL + Qt::Key_O);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
ret = ret && makeAction(action, "Save(&N)", Qt::CTRL + Qt::Key_S);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
ret = ret && makeAction(action, "Save As(&A)", Qt::CTRL + Qt::SHIFT + Qt::Key_S);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
ret = ret && makeAction(action, "Print(&P)", Qt::CTRL + Qt::Key_P);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
ret = ret && makeAction(action, "Exit(&X)", 0);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
}
if(ret)
{
mb->addMenu(menu);
}
else
{
delete menu;
}
return ret;
}
bool MainWindow::initEditMenu(QMenuBar* mb)
{
QMenu* menu = new QMenu("Edit(&E)", nullptr);
bool ret = (menu != nullptr);
if(ret)
{
QAction* action = nullptr;
ret = ret && makeAction(action, "Undo(&U)", Qt::CTRL + Qt::Key_Z);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
ret = ret && makeAction(action, "Redo(&R)", Qt::CTRL + Qt::Key_Y);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
ret = ret && makeAction(action, "Cut(&T)", Qt::CTRL + Qt::Key_X);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
ret = ret && makeAction(action, "Copy(&C)", Qt::CTRL + Qt::Key_C);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
ret = ret && makeAction(action, "Paste(&P)", Qt::CTRL + Qt::Key_V);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
ret = ret && makeAction(action, "Delete(&L)", Qt::Key_Delete);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
ret = ret && makeAction(action, "Find(&F)", Qt::CTRL + Qt::Key_F);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
ret = ret && makeAction(action, "Replace(&R)", Qt::CTRL + Qt::Key_H);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
ret = ret && makeAction(action, "Goto(&G)", Qt::CTRL + Qt::Key_G);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
ret = ret && makeAction(action, "Select All(&A)", Qt::CTRL + Qt::Key_A);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
}
if(ret)
{
mb->addMenu(menu);
}
else
{
delete menu;
}
return ret;
}
bool MainWindow::initFormatMenu(QMenuBar* mb)
{
QMenu* menu = new QMenu("Format(&O)", nullptr);
bool ret = (menu != nullptr);
if(ret)
{
QAction* action = nullptr;
ret = ret && makeAction(action, "AutoWrap(&W)", 0);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
ret = ret && makeAction(action, "Font(&F)", 0);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
}
if(ret)
{
mb->addMenu(menu);
}
else
{
delete menu;
}
return ret;
}
bool MainWindow::initViewMenu(QMenuBar* mb)
{
QMenu* menu = new QMenu("View(&V)", nullptr);
bool ret = (menu != nullptr);
if(ret)
{
QAction* action = nullptr;
ret = ret && makeAction(action, "ToolBar(&T)", 0);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
ret = ret && makeAction(action, "StatusBar(&S)", 0);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
}
if(ret)
{
mb->addMenu(menu);
}
else
{
delete menu;
}
return ret;
}
bool MainWindow::initHelpMenu(QMenuBar* mb)
{
QMenu* menu = new QMenu("Help(&H)", nullptr);
bool ret = (menu != nullptr);
if(ret)
{
QAction* action = nullptr;
ret = ret && makeAction(action, "User Manual", 0);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
ret = ret && makeAction(action, "About NotePad...", 0);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
}
if(ret)
{
mb->addMenu(menu);
}
else
{
delete menu;
}
return ret;
}
bool MainWindow::initFileToolItem(QToolBar* tb)
{
bool ret = true;
QAction* action = nullptr;
ret = ret && makeAction(action, "New", ":/res/pic/new.png");
if(ret)
{
tb->addAction(action);
}
ret = ret && makeAction(action, "Open", ":/res/pic/open.png");
if(ret)
{
tb->addAction(action);
}
ret = ret && makeAction(action, "Save", ":/res/pic/save.png");
if(ret)
{
tb->addAction(action);
}
ret = ret && makeAction(action, "Save as", ":/res/pic/saveas.png");
if(ret)
{
tb->addAction(action);
}
ret = ret && makeAction(action, "Print", ":/res/pic/print.png");
if(ret)
{
tb->addAction(action);
}
return ret;
}
bool MainWindow::initEditToolItem(QToolBar* tb)
{
bool ret = true;
QAction* action = nullptr;
ret = ret && makeAction(action, "Undo", ":/res/pic/undo.png");
if(ret)
{
tb->addAction(action);
}
ret = ret && makeAction(action, "Redo", ":/res/pic/redo.png");
if(ret)
{
tb->addAction(action);
}
ret = ret && makeAction(action, "Cut", ":/res/pic/cut.png");
if(ret)
{
tb->addAction(action);
}
ret = ret && makeAction(action, "Copy", ":/res/pic/copy.png");
if(ret)
{
tb->addAction(action);
}
ret = ret && makeAction(action, "Paste", ":/res/pic/paste.png");
if(ret)
{
tb->addAction(action);
}
ret = ret && makeAction(action, "Find", ":/res/pic/find.png");
if(ret)
{
tb->addAction(action);
}
ret = ret && makeAction(action, "Replace", ":/res/pic/replace.png");
if(ret)
{
tb->addAction(action);
}
ret = ret && makeAction(action, "Goto", ":/res/pic/goto.png");
if(ret)
{
tb->addAction(action);
}
return ret;
}
bool MainWindow::initFormatToolItem(QToolBar* tb)
{
bool ret = true;
QAction* action = nullptr;
ret = ret && makeAction(action, "Wrap", ":/res/pic/wrap.png");
if(ret)
{
tb->addAction(action);
}
ret = ret && makeAction(action, "Font", ":/res/pic/font.png");
if(ret)
{
tb->addAction(action);
}
return ret;
}
bool MainWindow::initViewToolItem(QToolBar* tb)
{
bool ret = true;
QAction* action = nullptr;
ret = ret && makeAction(action, "Tool", ":/res/pic/tool.png");
if(ret)
{
tb->addAction(action);
}
ret = ret && makeAction(action, "Status", ":/res/pic/status.png");
if(ret)
{
tb->addAction(action);
}
return ret;
}
bool MainWindow::makeAction(QAction*& action, QString str, int key)
{
bool ret = true;
action = new QAction(str, nullptr);
if(action != nullptr)
{
action->setShortcut(QKeySequence(key));
}
else
{
ret = false;
}
return ret;
}
bool MainWindow::makeAction(QAction*& action, QString tip, QString res)
{
bool ret = true;
action = new QAction("", nullptr);
if(action != nullptr)
{
action->setToolTip(tip);
action->setIcon(QIcon(res));
}
else
{
ret = false;
}
return ret;
}
MainWindow::~MainWindow()
{
}
main.cpp
#include "MainWindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
int ret = 0;
MainWindow* w = MainWindow::NewInstance();
if(w != nullptr)
{
w->show();
ret = a.exec();
}
delete w;
return ret;
}
- 小结:
— 状态栏是程序中输出简要信息的区域
— QStatusBar
是 Qt 中创建状态栏组件的类
— QStatusBar
中可以添加任意的QWidget
— QStatusBar
有自己内置的设计原则
— QStatusBar
可以定制出各种形式的状态栏