Qt 第六章 MailClient的例子
可以学习到
（1）菜单栏的创建，状态条。
（2）读取和保存应用程序的配置。
（3）spliter的布局。
（4）QWidgetTreeList以及QStingList
（5）构造一个QMainWindow窗体实例的方法
mailclient.h
#ifndef MAILCLIENT_H
#define MAILCLIENT_H
#include <QMainWindow>
class QIcon;
class QSplitter;
class QTextEdit;
class QTreeWidget;
class MailClient : public QMainWindow
{
Q_OBJECT
public:
MailClient();
protected:
void closeEvent(QCloseEvent *event);
private:
void addFolder(const QIcon &icon, const QString &name);
void addMessage(const QString &subject, const QString &from,
const QString &date);//标题。发信人。时间。
void readSettings();
void writeSettings();
QSplitter *mainSplitter;
QSplitter *rightSplitter;
QTreeWidget *foldersTreeWidget;
QTreeWidget *messagesTreeWidget;
QTextEdit *textEdit;
};
#endif
mailclient.cpp
#include <QtGui>
#include "mailclient.h"
//构造函数
MailClient::MailClient()
{
//文件夹和垃圾站的icon
QIcon folderIcon(style()->standardPixmap(QStyle::SP_DirClosedIcon));
QIcon trashIcon(style()->standardPixmap(QStyle::SP_FileIcon));
//俩QTreeeWidget的header是QStringList
QStringList folderLabels;
folderLabels << tr("Folders");
foldersTreeWidget = new QTreeWidget;
foldersTreeWidget->setHeaderLabels(folderLabels);
addFolder(folderIcon, tr("Inbox"));
addFolder(folderIcon, tr("Outbox"));
addFolder(folderIcon, tr("Sent"));
addFolder(trashIcon, tr("Trash"));
QStringList messageLabels;
messageLabels << tr("Subject") << tr("Sender") << tr("Date");
messagesTreeWidget = new QTreeWidget;
messagesTreeWidget->setHeaderLabels(messageLabels);
addMessage(tr("Happy New Year!"),
tr("Grace K. <[email protected]>"),
tr("2006-12-31"));
addMessage(tr("Radically new concept!"),
tr("Grace K. <[email protected]>"),
tr("2006-12-22"));
addMessage(tr("Accounts"),
tr("[email protected]"),
tr("2006-12-31"));
addMessage(tr("Expenses"),
tr("Joe Bloggs <[email protected]>"),
tr("2006-12-25"));
addMessage(tr("Re: Expenses"),
tr("Andy <[email protected]>"),
tr("2007-01-02"));
addMessage(tr("Re: Accounts"),
tr("Joe Bloggs <[email protected]>"),
tr("2007-01-03"));
addMessage(tr("Re: Accounts"),
tr("Andy <[email protected]>"),
tr("2007-01-03"));
messagesTreeWidget->resizeColumnToContents(0);
messagesTreeWidget->resizeColumnToContents(1);
textEdit = new QTextEdit;
textEdit->setReadOnly(true);//文本编辑框只读
//文本框内的内容是HTML格式的。
textEdit->setHtml("<table bolder=0>"
"<tr><td align=right><b>Subject:</b>"
"<td><p>Happy New Year!"
"<tr><td align=right><b>Date:</b>"
"<td><p>Sun, 31 Dec 2006"
"<tr><td align=right><b>From:</b>"
"<td><p>Grace K. <[email protected]>"
"<tr><td align=right><b>To:</b>"
"<td>[email protected]"
"</table>"
"<br>I want to seize this occasion to thank "
"everybody for the year that has gone, and want "
"to wish you the best for next year. It has been "
"a pleasure to work with you all on the Hawk "
"project, and I'm sure we'll get concrete "
"results shortly."
"<br><br>Happy New Year!"
"<br>--Grace");
//菜单栏构造
menuBar()->addMenu(tr("&File"));
menuBar()->addMenu(tr("&Edit"));
menuBar()->addMenu(tr("&View"));
menuBar()->addMenu(tr("F&older"));
menuBar()->addMenu(tr("&Message"));
menuBar()->addMenu(tr("&Settings"));
menuBar()->addMenu(tr("&Help"));
//状态条
statusBar()->showMessage(tr("No new messages on server"));
//右边的spliter是垂直的。
rightSplitter = new QSplitter(Qt::Vertical);
rightSplitter->addWidget(messagesTreeWidget);
rightSplitter->addWidget(textEdit);
//
rightSplitter->setStretchFactor(1, 1);
//主布局是水平的spliter
mainSplitter = new QSplitter(Qt::Horizontal);
mainSplitter->addWidget(foldersTreeWidget);
mainSplitter->addWidget(rightSplitter);
//
mainSplitter->setStretchFactor(1, 1);
//主布局作为中央窗体。
setCentralWidget(mainSplitter);
setWindowTitle(tr("Mail Client"));
readSettings();
}
//重载关闭事件函数的目的在于关闭时保存设置。
void MailClient::closeEvent(QCloseEvent *event)
{
writeSettings();
event->accept();
}
//加入一个文件夹。
void MailClient::addFolder(const QIcon &icon, const QString &name)
{
QTreeWidgetItem *root;
if (foldersTreeWidget->topLevelItemCount() == 0) {
root = new QTreeWidgetItem(foldersTreeWidget);
root->setText(0, tr("Mail"));
foldersTreeWidget->setItemExpanded(root, true);
} else {
root = foldersTreeWidget->topLevelItem(0);
}
QTreeWidgetItem *newItem = new QTreeWidgetItem(root);
newItem->setText(0, name);
newItem->setIcon(0, icon);
if (!foldersTreeWidget->currentItem())
foldersTreeWidget->setCurrentItem(newItem);
}
//添加一个新邮件消息。
void MailClient::addMessage(const QString &subject, const QString &from,
const QString &date)
{
QTreeWidgetItem *newItem = new QTreeWidgetItem(messagesTreeWidget);
newItem->setText(0, subject);
newItem->setText(1, from);
newItem->setText(2, date);
if (!messagesTreeWidget->currentItem())
messagesTreeWidget->setCurrentItem(newItem);
}
void MailClient::readSettings()
{
QSettings settings("Software Inc.", "Mail Client");
settings.beginGroup("mainWindow");
resize(settings.value("size", QSize(480, 360)).toSize());
mainSplitter->restoreState(
settings.value("mainSplitter").toByteArray());
rightSplitter->restoreState(
settings.value("rightSplitter").toByteArray());
settings.endGroup();
}
void MailClient::writeSettings()
{
QSettings settings("Software Inc.", "Mail Client");
settings.beginGroup("mainWindow");
settings.setValue("size", size());
settings.setValue("mainSplitter", mainSplitter->saveState());
settings.setValue("rightSplitter", rightSplitter->saveState());
settings.endGroup();
}
俩都是QTreeWidget
header是QStringList
