开发语言对话框【QT】如何自定义QMessageBox的窗口大小，通过继承QDialog重新实现美观的弹窗

1. QMessageBox原有的弹窗2. 网上第一种方法：通过样式表setStyleSheet实现改变弹窗大小（总体不美观）3. 网上第二种方法：重写ShowEvent()改变弹窗大小（总体也不美观）4. 最好的办法：继承QDialog重新实现弹窗界面（附完整代码）(v1.0)5. v1.0的改进：重新实现弹窗界面（附完整代码）(v2.0)

1. QMessageBox原有的弹窗

QMessageBox messageBox(QMessageBox::Question, "提示", "是否保存当前项目？", QMessageBox::Yes | QMessageBox::No);

messageBox.exec();

可以看出QMessageBox原有的弹窗看起来非常的不美观，有时候大有时候小，只能使用QMessageBox自带的图标，而且不能自定义窗口的大小，那是因为在源码中将其弹窗大小设置成了比较合适的大小，所以不能自定义改变弹窗大小，如下所示代码都是不起作用的：

messageBox.setGeometry(800, 300, 450, 225); //（500，300）设置其位置是有效的，但是设置其大小（450, 225）是无效的

messageBox.resize(450, 225); //resize大小也是无效的

2. 网上第一种方法：通过样式表setStyleSheet实现改变弹窗大小（总体不美观）

QMessageBox messageBox(QMessageBox::Question, "提示", "是否保存当前项目？", QMessageBox::Yes | QMessageBox::No);

messageBox.setStyleSheet("QLabel{"

"min-width:150px;"

"min-height:120px;"

"font-size:16px;"

"}");

messageBox.exec();

可以看出通过样式表的方法也不太美观，其中text没有居中。

3. 网上第二种方法：重写ShowEvent()改变弹窗大小（总体也不美观）

先上代码实现一下： MyMessageBox.h

#include

class MyMessageBox : public QMessageBox {

Q_OBJECT

public:

MyMessageBox(Icon icon, const QString& title, const QString& text,

StandardButtons buttons, QWidget* parent = 0);

~MyMessageBox();

protected:

void showEvent(QShowEvent* event) override;

};

MyMessageBox.cpp

#include "mymessagebox.h"

MyMessageBox::MyMessageBox(Icon icon, const QString& title, const QString& text,

StandardButtons buttons, QWidget* parent) :

QMessageBox(icon, title, text, buttons, parent) {

}

MyMessageBox::~MyMessageBox() {

}

void MyMessageBox::showEvent(QShowEvent* event) {

QWidget* textLabel = findChild("qt_msgbox_label"); //获取源码中text的label组件

QWidget* iconLabel = findChild("qt_msgbox_icon_label"); //获取源码中icon的label组件

if (textLabel != nullptr) { //使用指针之前先判断是否为空

textLabel->setMinimumSize(450, 255);

// textLabel->setFixedSize(450, 255);

}

if (iconLabel != nullptr) {

iconLabel->setMinimumHeight(255);

iconLabel->setFixedSize(450, 255);

}

QMessageBox::showEvent(event);

}

main.cpp

#include

#include "mymessagebox.h"

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

QApplication a(argc, argv);

MyMessageBox messageBox(QMessageBox::Question, "提示", "是否保存当前项目？", QMessageBox::Yes | QMessageBox::No);

messageBox.exec();

//w.show();

return a.exec();

}

解释一下上面的一些代码先看一下QMessageBox中的一些源码：在对某一个组件设置了setObjectName()属性之后，我们可以通过objectName在外面获得这个组件，如下：

//QLabel继承于QWidget，所以用QWidget*是可以的

QWidget* textLabel = findChild("qt_msgbox_label"); //获取源码中text的label组件

然后对label组件的大小进行调整，达到调整弹窗大小的目的。可以看到弹窗的大小是改变了，但是还是不美观，主要是图标没有居中，还是处在左上角的位置，如下图所示：

那对于上面这个问题出现的原因是什么呢？那就看一下QMessageBox中的关于布局Layout的一些源码：可以看出在布局时，其icon总是处在第0行第0列的位置，且其Aliment设置的是Top，所以导致了QMessageBox的图标总是在左上角。所以重写ShowEvent()这种方法也达不到实现美观的弹窗的预期。

4. 最好的办法：继承QDialog重新实现弹窗界面（附完整代码）(v1.0)

重新写一个弹窗TipDialog类，继承于QDialog类。先看效果：直接上代码： TipDialog.h

#ifndef TIPDIALOG_H

#define TIPDIALOG_H

#include

class TipDialog : public QDialog {

Q_OBJECT

public:

enum TipIcon {

NoIcon = 0,

Information = 1,

Question = 2,

Success = 3,

Warning = 4,

Critical = 5

};

Q_ENUM(TipIcon) //使用Q_ENUM注册枚举

enum StandardButton {

//保持与 QDialogButtonBox::StandardButton 一致，后面在创建按钮时会用到 & 运算

NoButton = 0x00000000,

Ok = 0x00000400,

Save = 0x00000800,

SaveAll = 0x00001000,

Open = 0x00002000,

Yes = 0x00004000,

YesToAll = 0x00008000,

No = 0x00010000,

NoToAll = 0x00020000,

Abort = 0x00040000,

Retry = 0x00080000,

Ignore = 0x00100000,

Close = 0x00200000,

Cancel = 0x00400000,

Discard = 0x00800000,

Help = 0x01000000,

Apply = 0x02000000,

Reset = 0x04000000,

RestoreDefaults = 0x08000000,

FirstButton = Ok,

LastButton = RestoreDefaults

};

Q_ENUM(StandardButton)

Q_DECLARE_FLAGS(StandardButtons, StandardButton)

Q_FLAG(StandardButtons)

enum ButtonRole {

//保持与 QDialogButtonBox::ButtonRole 一致

InvalidRole = -1,

AcceptRole,

RejectRole,

DestructiveRole,

ActionRole,

HelpRole,

YesRole,

NoRole,

ResetRole,

ApplyRole,

NRoles

};

explicit TipDialog(QWidget* parent = nullptr);

TipDialog(TipIcon icon, const QString& title, const QString& text, StandardButtons buttons,

QWidget* parent = nullptr); //构造函数有默认值的要放后面

~TipDialog();

static void information(QWidget* parent, const QString& title, const QString& text, StandardButtons buttons = Ok);

static void question(QWidget* parent, const QString& title, const QString& text, StandardButtons buttons = StandardButtons(Yes | No));

static void success(QWidget* parent, const QString& title, const QString& text, StandardButtons buttons = Ok);

static void warning(QWidget* parent, const QString& title, const QString& text, StandardButtons buttons = Ok);

static void critical(QWidget* parent, const QString& title, const QString& text, StandardButtons buttons = Ok);

private:

void init(const QString& title = QString(), const QString& text = QString());

void setupLayout();

QPixmap standardIcon(TipDialog::TipIcon icon);

void setIcon(TipIcon icon);

void createButton(StandardButton button);

void createStandardButtons(StandardButtons buttons);

void setStandardButtons(StandardButtons buttons);

// QString standardTitle(TipDialog::TipIcon icon);

QString getEnumKey(StandardButton button);

void addButton(StandardButton button, QDialogButtonBox::ButtonRole buttonRole);

private:

QLabel* m_pIconLabel;

QLabel* m_pTextLabel;

QDialogButtonBox* m_pButtonBox;

// QList m_pButtonList;

QString m_text;

};

//在全局任意地方使用"|"操作符计算自定义的枚举量，需要使用Q_DECLARE_OPERATORS_FOR_FLAGS宏

Q_DECLARE_OPERATORS_FOR_FLAGS(TipDialog::StandardButtons)

#endif // TIPDIALOG_H

TipDialog.cpp

#include "tipdialog.h"

#define fontFamily "宋体"

#define fontSize 12

TipDialog::TipDialog(QWidget* parent) :

QDialog(parent) {

init();

}

TipDialog::TipDialog(TipIcon icon, const QString& title, const QString& text, StandardButtons buttons, QWidget* parent) :

QDialog(parent) {

init(title, text);

setWindowTitle(title);

setIcon(icon);

setStandardButtons(buttons);

// setupLayout();

}

TipDialog::~TipDialog() {}

void TipDialog::information(QWidget* parent, const QString& title, const QString& text, StandardButtons buttons) {

TipDialog tip(Information, title, text, buttons, parent);

tip.exec();

}

void TipDialog::question(QWidget* parent, const QString& title, const QString& text, StandardButtons buttons) {

TipDialog tip(Question, title, text, buttons, parent);

tip.exec();

}

void TipDialog::success(QWidget* parent, const QString& title, const QString& text, StandardButtons buttons) {

TipDialog tip(Success, title, text, buttons, parent);

tip.exec();

}

void TipDialog::warning(QWidget* parent, const QString& title, const QString& text, StandardButtons buttons) {

TipDialog tip(Warning, title, text, buttons, parent);

tip.exec();

}

void TipDialog::critical(QWidget* parent, const QString& title, const QString& text, StandardButtons buttons) {

TipDialog tip(Critical, title, text, buttons, parent);

tip.exec();

}

void TipDialog::init(const QString& title, const QString& text) {

resize(QSize(450, 225));

setWindowIcon(QIcon(":/new/prefix1/Icon/项目.png"));

setWindowTitle("operation tip...");

setWindowFlags(Qt::CustomizeWindowHint | Qt::WindowCloseButtonHint); //设置右上角按钮

//setAttribute(Qt::WA_DeleteOnClose); //关闭窗口时将窗口释放掉即释放内存

m_pIconLabel = new QLabel(this);

m_pIconLabel->setObjectName(QLatin1String("iconLabel"));

m_pTextLabel = new QLabel(this);

m_pTextLabel->setObjectName(QLatin1String("textLabel"));

m_pTextLabel->setTextInteractionFlags(Qt::TextBrowserInteraction); //label中的内容可用鼠标选择文本复制，链接激活

m_pTextLabel->setOpenExternalLinks(true); //label中的内容若为链接，可直接点击打开

m_pButtonBox = new QDialogButtonBox(this);

m_pButtonBox->setObjectName(QLatin1String("buttonBox"));

if (!title.isEmpty() || !text.isEmpty()) {

setWindowTitle(title);

m_pTextLabel->setFont(QFont(fontFamily, fontSize));

m_pTextLabel->setText(text);

}

m_text = text;

setupLayout();

}

void TipDialog::setupLayout() {

QHBoxLayout* HLay = new QHBoxLayout;

HLay->addWidget(m_pIconLabel, 1, Qt::AlignVCenter | Qt::AlignRight);

HLay->addWidget(m_pTextLabel, 5, Qt::AlignCenter);

QVBoxLayout* VLay = new QVBoxLayout;

VLay->addLayout(HLay);

VLay->addWidget(m_pButtonBox);

setLayout(VLay);

}

QPixmap TipDialog::standardIcon(TipDialog::TipIcon icon) {

QPixmap pixmap;

switch (icon) {

case TipDialog::Information:

pixmap.load(":/new/prefix1/Image/Information.png");

break;

case TipDialog::Question:

pixmap.load(":/new/prefix1/Image/Question.png");

break;

case TipDialog::Success:

pixmap.load(":/new/prefix1/Image/Success.png");

break;

case TipDialog::Warning:

pixmap.load(":/new/prefix1/Image/Warning.png");

break;

case TipDialog::Critical:

pixmap.load(":/new/prefix1/Image/Critical.png");

break;

default:

break;

}

if (!pixmap.isNull())

return pixmap;

return QPixmap();

}

void TipDialog::setIcon(TipDialog::TipIcon icon) {

m_pIconLabel->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);

m_pIconLabel->setPixmap(standardIcon(icon));

}

void TipDialog::createButton(StandardButton button) {

switch (button) {

case TipDialog::Ok:

addButton(button, QDialogButtonBox::AcceptRole);

break;

case TipDialog::Save:

addButton(button, QDialogButtonBox::AcceptRole);

break;

case TipDialog::Yes:

addButton(button, QDialogButtonBox::YesRole);

break;

case TipDialog::No:

addButton(button, QDialogButtonBox::NoRole);

break;

case TipDialog::Cancel:

addButton(button, QDialogButtonBox::RejectRole);

break;

default:

break;

}

void TipDialog::createStandardButtons(StandardButtons buttons) {

//TipDialog::StandardButtons 与 QDialogButtonBox::StandardButtons 的枚举是一样的

uint i = QDialogButtonBox::FirstButton; //枚举值为非负整数，使用uint

while (i <= QDialogButtonBox::LastButton) {

if (i & buttons) {

createButton(StandardButton(i));

}

i = i << 1;

}

void TipDialog::setStandardButtons(StandardButtons buttons) {

if (buttons != NoButton)

createStandardButtons(buttons);

}

//QString TipDialog::standardTitle(TipDialog::TipIcon icon) {

// QString title;

// switch (icon) {

// case TipDialog::Information:

// title = "Information";

// break;

// case TipDialog::Question:

// title = "Question";

// break;

// case TipDialog::Success:

// title = "Success";

// break;

// case TipDialog::Warning:

// title = "Warning";

// break;

// case TipDialog::Critical:

// title = "Critical";

// break;

// default:

// break;

// }

// if (!title.isEmpty())

// return title;

// return QString();

//}

QString TipDialog::getEnumKey(StandardButton button) {

QMetaEnum metaEnum = QMetaEnum::fromType(); //获取QMetaEnum对象，为了获取枚举值

QString str = metaEnum.valueToKey(button);

if (!str.isEmpty())

return str;

return QString();

}

void TipDialog::addButton(TipDialog::StandardButton button, QDialogButtonBox::ButtonRole buttonRole) {

QString buttonText = getEnumKey(button);

QPushButton* pushButton = m_pButtonBox->addButton(buttonText, buttonRole);

// if (pushButton->text() == QLatin1String("Yes") && m_text.contains("save", Qt::CaseSensitive)) {

// pushButton->setText("Save");

// } else if (pushButton->text() == QLatin1String("Yes") && m_text.contains("delete", Qt::CaseSensitive)) {

// pushButton->setText("Delete");

// }

// m_pButtonList.append(pushButton);

connect(pushButton, &QPushButton::clicked, this, &TipDialog::close);

}

main.cpp

#include

#include "tipdialog.h"

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

QApplication a(argc, argv);

//TipDialog aa(TipDialog::Question, "Question", "The current project has been modified.\nDo you want to save it?", TipDialog::Yes | TipDialog::No);

//TipDialog aa(TipDialog::Success, "Success", "Project saved successfully!", TipDialog::Ok);

//TipDialog aa(TipDialog::Warning, "Warning", "Parsed file not found! Please reconfigure!", TipDialog::Ok);

TipDialog aa(TipDialog::Critical, "Critical", "Loading failed.Please tryagain!", TipDialog::Ok);

aa.show();

return a.exec();

}

注意：需要在Resources文件中自己手动添加icon图片。

5. v1.0的改进：重新实现弹窗界面（附完整代码）(v2.0)

效果图：

增加了许多接口，并且之前v1.0版本添加按钮是自己实现的，其实不需要，直接使用QDialogButtonBox的接口会更方便。 MyMessageBox.h

#ifndef MyMessageBox_H

#define MyMessageBox_H

#include

class MyMessageBox : public QDialog {

Q_OBJECT

public:

enum Icon {

NoIcon = 0,

Information = 1,

Question = 2,

Success = 3,

Warning = 4,

Critical = 5

};

Q_ENUM(Icon) //使用Q_ENUM注册枚举

enum StandardButton {

//尽量保持与 QDialogButtonBox::StandardButton 一致，在创建按钮时可能会用到 & 运算

NoButton = 0x00000000,

Ok = 0x00000400,

Save = 0x00000800,

SaveAll = 0x00001000,

Open = 0x00002000,

Yes = 0x00004000,

YesToAll = 0x00008000,

No = 0x00010000,

NoToAll = 0x00020000,

Abort = 0x00040000,

Retry = 0x00080000,

Ignore = 0x00100000,

Close = 0x00200000,

Cancel = 0x00400000,

Discard = 0x00800000,

Help = 0x01000000,

Apply = 0x02000000,

Reset = 0x04000000,

RestoreDefaults = 0x08000000,

FirstButton = Ok,

LastButton = RestoreDefaults

};

Q_ENUM(StandardButton)

Q_DECLARE_FLAGS(StandardButtons, StandardButton)

Q_FLAG(StandardButtons)

enum ButtonRole {

//保持与 QDialogButtonBox::ButtonRole 一致

InvalidRole = -1,

AcceptRole,

RejectRole,

DestructiveRole,

ActionRole,

HelpRole,

YesRole,

NoRole,

ResetRole,

ApplyRole,

NRoles

};

explicit MyMessageBox(QWidget* parent = nullptr);

MyMessageBox(Icon icon, const QString& title, const QString& text, StandardButtons buttons,

QWidget* parent = nullptr); //构造函数有默认值的要放后面

~MyMessageBox();

void setTitle(const QString& title);

Icon icon() const;

void setIcon(Icon icon);

QPixmap iconPixmap() const;

void setIconPixmap(const QPixmap& pixmap);

QString text() const;

void setText(const QString& text);

StandardButtons standardButtons() const;

void setStandardButtons(StandardButtons buttons);

StandardButton standardButton(QAbstractButton* button) const;

QAbstractButton* button(StandardButton which) const;

ButtonRole buttonRole(QAbstractButton* button) const;

QAbstractButton* clickedButton() const;

static StandardButton information(QWidget* parent, const QString& text, QString title = "Message", StandardButtons buttons = Ok);

static StandardButton question(QWidget* parent, const QString& text, QString title = "Message", StandardButtons buttons = StandardButtons(Yes | No));

static StandardButton success(QWidget* parent, const QString& text, QString title = "Message", StandardButtons buttons = Ok);

static StandardButton warning(QWidget* parent, const QString& text, QString title = "Message", StandardButtons buttons = Ok);

static StandardButton critical(QWidget* parent, const QString& text, QString title = "Message", StandardButtons buttons = Ok);

static StandardButton showMessageBox(QWidget* parent, Icon icon, const QString& text, QString title, StandardButtons buttons);

static void setMessageBoxGeometry(QWidget* parent, MyMessageBox& msgBox);

private slots:

void slotPushButtonClicked(QAbstractButton* button);

private:

void init();

void setupLayout();

QPixmap standardIcon(Icon icon);

void setClickedButton(QAbstractButton* button);

void finalize(QAbstractButton* button);

int dialogCodeForButton(QAbstractButton* button) const;

void setPushButtonProperty(QList buttonList);

private:

QLabel* m_pIconLabel;

MyMessageBox::Icon m_icon;

QLabel* m_pTextLabel;

QLabel* m_pLineLabel;

QDialogButtonBox* m_pButtonBox;

QAbstractButton* m_pClickedButton;

};

//在全局任意地方使用"|"操作符计算自定义的枚举量，需要使用Q_DECLARE_OPERATORS_FOR_FLAGS宏

Q_DECLARE_OPERATORS_FOR_FLAGS(MyMessageBox::StandardButtons)

#endif // MyMessageBox_H

};

//在全局任意地方使用"|"操作符计算自定义的枚举量，需要使用Q_DECLARE_OPERATORS_FOR_FLAGS宏

Q_DECLARE_OPERATORS_FOR_FLAGS(MyMessageBox::StandardButtons)

#endif // MyMessageBox_H

MyMessageBox.cpp

#include "MyMessageBox.h"

#define MESSAGEWIDTH 450 //界面的大小

#define MESSAGEHEIGHT 225

#define TEXTFONTFAMILY "微软雅黑" //text的字体样式和大小

#define TEXTFONTSIZE 12

#define BUTTONFONTFAMILY "微软雅黑" //按钮的字体样式和大小

#define BUTTONFONTSIZE 10

#define BUTTONWIDTH 100 //按钮的大小

#define BUTTONHEIGHT 30

MyMessageBox::MyMessageBox(QWidget* parent) :

QDialog(parent) {

init();

}

MyMessageBox::MyMessageBox(Icon icon, const QString& title, const QString& text, StandardButtons buttons, QWidget* parent) :

QDialog(parent) {

init();

setTitle(title);

setIcon(icon);

setText(text);

if (buttons != NoButton)

setStandardButtons(buttons);

}

MyMessageBox::~MyMessageBox() {}

void MyMessageBox::setTitle(const QString& title) {

setWindowTitle(title);

}

MyMessageBox::Icon MyMessageBox::icon() const {

return m_icon;

}

void MyMessageBox::setIcon(MyMessageBox::Icon icon) {

setIconPixmap(standardIcon(icon));

m_icon = icon;

}

QPixmap MyMessageBox::iconPixmap() const {

return *m_pIconLabel->pixmap();

}

void MyMessageBox::setIconPixmap(const QPixmap& pixmap) {

// m_pIconLabel->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);

m_pIconLabel->setPixmap(pixmap);

m_icon = NoIcon;

}

QString MyMessageBox::text() const {

return m_pTextLabel->text();

}

void MyMessageBox::setText(const QString& text) {

m_pTextLabel->setFont(QFont(TEXTFONTFAMILY, TEXTFONTSIZE));

m_pTextLabel->setText(text);

}

MyMessageBox::StandardButtons MyMessageBox::standardButtons() const {

QDialogButtonBox::StandardButtons standardButtons = m_pButtonBox->standardButtons();

return MyMessageBox::StandardButtons(int(standardButtons)); //不同类型的枚举转换

}

void MyMessageBox::setStandardButtons(StandardButtons buttons) {

QDialogButtonBox::StandardButtons standardButtons = QDialogButtonBox::StandardButtons(int(buttons));

m_pButtonBox->setStandardButtons(standardButtons);

// m_pButtonBox->setStandardButtons(QDialogButtonBox::StandardButtons(int(buttons))); //上面两句归为一句

setPushButtonProperty(m_pButtonBox->buttons());

}

MyMessageBox::StandardButton MyMessageBox::standardButton(QAbstractButton* button) const {

QDialogButtonBox::StandardButton standardButton = m_pButtonBox->standardButton(button);

return (MyMessageBox::StandardButton)standardButton; //转化为当前类的StandardButton类型

}

QAbstractButton* MyMessageBox::button(MyMessageBox::StandardButton which) const {

QDialogButtonBox::StandardButton standardButton = QDialogButtonBox::StandardButton(which);

return m_pButtonBox->button(standardButton);

}

MyMessageBox::ButtonRole MyMessageBox::buttonRole(QAbstractButton* button) const {

QDialogButtonBox::ButtonRole buttonRole = m_pButtonBox->buttonRole(button);

return MyMessageBox::ButtonRole(buttonRole);

}

QAbstractButton* MyMessageBox::clickedButton() const {

return m_pClickedButton;

}

MyMessageBox::StandardButton MyMessageBox::information(QWidget* parent, const QString& text, QString title, StandardButtons buttons) {

return showMessageBox(parent, Information, text, title, buttons);

}

MyMessageBox::StandardButton MyMessageBox::question(QWidget* parent, const QString& text, QString title, StandardButtons buttons) {

return showMessageBox(parent, Question, text, title, buttons);

}

MyMessageBox::StandardButton MyMessageBox::success(QWidget* parent, const QString& text, QString title, StandardButtons buttons) {

return showMessageBox(parent, Success, text, title, buttons);

}

MyMessageBox::StandardButton MyMessageBox::warning(QWidget* parent, const QString& text, QString title, StandardButtons buttons) {

return showMessageBox(parent, Warning, text, title, buttons);

}

MyMessageBox::StandardButton MyMessageBox::critical(QWidget* parent, const QString& text, QString title, StandardButtons buttons) {

return showMessageBox(parent, Critical, text, title, buttons);

}

MyMessageBox::StandardButton MyMessageBox::showMessageBox(QWidget* parent, Icon icon, const QString& text, QString title, StandardButtons buttons) {

MyMessageBox msgBox(icon, title, text, buttons, parent);

//静态函数只能调用静态函数，setMessageBoxGeometry()必须声明为静态函数

setMessageBoxGeometry(parent, msgBox);

if (msgBox.exec() == -1)

return MyMessageBox::Cancel;

return msgBox.standardButton(msgBox.clickedButton());

}

void MyMessageBox::setMessageBoxGeometry(QWidget* parent, MyMessageBox& msgBox) {

QRect rect = parent->geometry();

int x = rect.x() + (rect.width() - msgBox.geometry().width()) / 2;

int y = rect.y() + (rect.height() - msgBox.geometry().height()) / 2;

msgBox.setGeometry(x, y, msgBox.geometry().width(), msgBox.geometry().height());

msgBox.move(x, y);

}

void MyMessageBox::slotPushButtonClicked(QAbstractButton* button) {

setClickedButton(button);

finalize(button);

close();

}

void MyMessageBox::init() {

resize(QSize(MESSAGEWIDTH, MESSAGEHEIGHT));

setWindowIcon(QIcon(":/new/prefix1/Icon/project.ico"));

setWindowTitle("Message");

//对于继承的QDialog，其Flags必须包含Qt::Dialog，不能自定义CustomizeWindowHint

//否则在构造中指定了parent之后会出现：标题栏消失以及窗口不在正中间

//setWindowFlags(Qt::CustomizeWindowHint | Qt::WindowCloseButtonHint); //设置右上角按钮

Qt::WindowFlags flags = Qt::Dialog;

flags |= Qt::WindowCloseButtonHint;

setWindowFlags(flags); //去掉标题栏右上角的问号

//setAttribute(Qt::WA_DeleteOnClose); //关闭窗口时将窗口释放掉即释放内存

m_pIconLabel = new QLabel(this);

m_pIconLabel->setObjectName(QLatin1String("iconLabel"));

m_pIconLabel->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed); //图标不可拉伸和缩小，固定大小

m_pTextLabel = new QLabel(this);

m_pTextLabel->setObjectName(QLatin1String("textLabel"));

m_pTextLabel->setTextInteractionFlags(Qt::TextBrowserInteraction); //label中的内容可用鼠标选择文本复制，链接激活

m_pTextLabel->setOpenExternalLinks(true); //label中的内容若为链接，可直接点击打开

m_pLineLabel = new QLabel(this);

m_pLineLabel->setFrameStyle(QFrame::HLine | QFrame::Sunken); //Sunken:凹陷，Raised：凸起

m_pButtonBox = new QDialogButtonBox(this); //默认按钮为水平布局Qt::Horizontal

m_pButtonBox->setObjectName(QLatin1String("buttonBox"));

connect(m_pButtonBox, &QDialogButtonBox::clicked, this, &MyMessageBox::slotPushButtonClicked);

setupLayout();

setModal(true);

setStyleSheet("QDialog{background-color:rgb(255 , 255 , 255);}"

"QPushButton{background-color:#E0E0E0;border: 1px solid #A6A6A6;border-radius:5px;}"

"QPushButton:hover{color:white;background-color:#4188FF;border-radius:5px;border: 0px}"

// "QPushButton{background-color:#E0E0E0;border: 1px solid #C2C2C2;border-radius:5px;}"

// "QPushButton:hover{background-color:#C2C2C2;border-radius:5px;border: 0px}"

"QPushButton:pressed{padding-left:3px;padding-top:3px;}");

}

void MyMessageBox::setupLayout() {

QHBoxLayout* HLay = new QHBoxLayout;

HLay->addWidget(m_pIconLabel, 1, Qt::AlignVCenter | Qt::AlignRight);

HLay->addWidget(m_pTextLabel, 5, Qt::AlignCenter);

QHBoxLayout* HLay1 = new QHBoxLayout;

HLay1->addWidget(m_pButtonBox, Qt::AlignRight);

// QMargins margin;

// margin.setRight(9);

// HLay1->setContentsMargins(margin); //调节按钮不要太靠右

QVBoxLayout* VLay = new QVBoxLayout;

VLay->addLayout(HLay, 10);

VLay->addWidget(m_pLineLabel, 1);

VLay->addLayout(HLay1, 4);

VLay->setSpacing(0);

setLayout(VLay);

}

QPixmap MyMessageBox::standardIcon(Icon icon) {

QPixmap pixmap;

switch (icon) {

case MyMessageBox::Information:

pixmap.load(":/new/prefix1/Image/Information.png");

break;

case MyMessageBox::Question:

pixmap.load(":/new/prefix1/Image/Question.png");

break;

case MyMessageBox::Success:

pixmap.load(":/new/prefix1/Image/Success.png");

break;

case MyMessageBox::Warning:

pixmap.load(":/new/prefix1/Image/Warning.png");

break;

case MyMessageBox::Critical:

pixmap.load(":/new/prefix1/Image/Critical.png");

break;

default:

break;

}

if (!pixmap.isNull())

return pixmap;

return QPixmap();

}

void MyMessageBox::setClickedButton(QAbstractButton* button) {

m_pClickedButton = button;

}

void MyMessageBox::finalize(QAbstractButton* button) {

int dialogCode = dialogCodeForButton(button);

if (dialogCode == QDialog::Accepted) {

emit accept();

} else if (dialogCode == QDialog::Rejected) {

emit reject();

}

int MyMessageBox::dialogCodeForButton(QAbstractButton* button) const {

switch (buttonRole(button)) {

case MyMessageBox::AcceptRole:

case MyMessageBox::YesRole:

return QDialog::Accepted;

case MyMessageBox::RejectRole:

case MyMessageBox::NoRole:

return QDialog::Rejected;

default:

return -1;

}

void MyMessageBox::setPushButtonProperty(QList buttonList) {

for (int i = 0; i < buttonList.size(); i++) {

QPushButton* pushButton = qobject_cast(buttonList.at(i));

pushButton->setMinimumSize(BUTTONWIDTH, BUTTONHEIGHT);

pushButton->setFont(QFont(BUTTONFONTFAMILY, BUTTONFONTSIZE));

}

注意：需要在Resources文件中自己手动添加icon图片。

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开发语言对话框【QT】如何自定义QMessageBox的窗口大小，通过继承QDialog重新实现美观的弹窗