Qt之自定义界面(QMessageBox)
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简述
通过前几节的自定义窗体的学习,我们可以很容易的写出一套属于自己风格的界面框架,通用于各种窗体,比如:QWidget、QDialog、QMainWindow。
大多数窗体的实现都是采用控件堆积来完成的,只要思路清晰,再复杂的界面实现起来都游刃有余。下面我来列举一个由QMessageBox扩展的提示框-根据其源码实现思路来实现!
- 简述
- 效果
- 自定义提示框
- 实现
- 接口说明
- 二次封装
- 使用方式
- 源码学习
效果
自定义提示框
实现
message_box.h
#ifndef MESSAGE_BOX#define MESSAGE_BOX#include <QMessageBox>#include <QDialogButtonBox>#include <QGridLayout>#include "custom_window.h"class QLabel;class MessageBox : public CustomWindow{ Q_OBJECTpublic: explicit MessageBox(QWidget *parent = 0, const QString &title = tr("Tip"), const QString &text = "", QMessageBox::StandardButtons buttons = QMessageBox::Ok, QMessageBox::StandardButton defaultButton = QMessageBox::Ok); ~MessageBox(); QAbstractButton *clickedButton() const; QMessageBox::StandardButton standardButton(QAbstractButton *button) const; // 设置默认按钮 void setDefaultButton(QPushButton *button); void setDefaultButton(QMessageBox::StandardButton button); // 设置窗体标题 void setTitle(const QString &title); // 设置提示信息 void setText(const QString &text); // 设置窗体图标 void setIcon(const QString &icon); // 添加控件-替换提示信息所在的QLabel void addWidget(QWidget *pWidget);protected: // 多语言翻译 void changeEvent(QEvent *event);private slots: void onButtonClicked(QAbstractButton *button);private: void translateUI(); int execReturnCode(QAbstractButton *button);private: QLabel *m_pIconLabel; QLabel *m_pLabel; QGridLayout *m_pGridLayout; QDialogButtonBox *m_pButtonBox; QAbstractButton *m_pClickedButton; QAbstractButton *m_pDefaultButton;};
message_box.cpp
#include <QLabel>#include <QPushButton>#include <QMessageBox>#include <QCheckBox>#include <QHBoxLayout>#include <QEvent>#include <QApplication>#include "message_box.h"MessageBox::MessageBox(QWidget *parent, const QString &title, const QString &text, QMessageBox::StandardButtons buttons, QMessageBox::StandardButton defaultButton) : CustomWindow(parent){ setWindowIcon(QIcon(":/Images/logo")); setWindowTitle(title); setMinimumSize(300, 130); setMinimizeVisible(false); setMaximizeVisible(false); setWidgetResizable(false); m_pButtonBox = new QDialogButtonBox(this); m_pButtonBox->setStandardButtons(QDialogButtonBox::StandardButtons(int(buttons))); setDefaultButton(defaultButton); QPushButton *pYesButton = m_pButtonBox->button(QDialogButtonBox::Yes); if (pYesButton != NULL) { pYesButton->setObjectName("blueButton"); pYesButton->setStyle(QApplication::style()); } m_pIconLabel = new QLabel(this); m_pLabel = new QLabel(this); QPixmap pixmap(":/Images/information"); m_pIconLabel->setPixmap(pixmap); m_pIconLabel->setFixedSize(35, 35); m_pIconLabel->setScaledContents(true); m_pLabel->setAlignment(Qt::AlignLeft | Qt::AlignVCenter); m_pLabel->setObjectName("whiteLabel"); m_pLabel->setOpenExternalLinks(true); m_pLabel->setText(text); m_pGridLayout = new QGridLayout(); m_pGridLayout->addWidget(m_pIconLabel, 0, 0, 2, 1, Qt::AlignTop); m_pGridLayout->addWidget(m_pLabel, 0, 1, 2, 1); m_pGridLayout->addWidget(m_pButtonBox, m_pGridLayout->rowCount(), 0, 1, m_pGridLayout->columnCount()); m_pGridLayout->setSizeConstraint(QLayout::SetNoConstraint); m_pGridLayout->setHorizontalSpacing(10); m_pGridLayout->setVerticalSpacing(10); m_pGridLayout->setContentsMargins(10, 10, 10, 10); m_pLayout->addLayout(m_pGridLayout); translateUI(); connect(m_pButtonBox, SIGNAL(clicked(QAbstractButton*)), this, SLOT(onButtonClicked(QAbstractButton*)));}MessageBox::~MessageBox(){}void MessageBox::changeEvent(QEvent *event){ switch (event->type()) { case QEvent::LanguageChange: translateUI(); break; default: CustomWindow::changeEvent(event); }}void MessageBox::translateUI(){ QPushButton *pYesButton = m_pButtonBox->button(QDialogButtonBox::Yes); if (pYesButton != NULL) pYesButton->setText(tr("Yes")); QPushButton *pNoButton = m_pButtonBox->button(QDialogButtonBox::No); if (pNoButton != NULL) pNoButton->setText(tr("No")); QPushButton *pOkButton = m_pButtonBox->button(QDialogButtonBox::Ok); if (pOkButton != NULL) pOkButton->setText(tr("Ok")); QPushButton *pCancelButton = m_pButtonBox->button(QDialogButtonBox::Cancel); if (pCancelButton != NULL) pCancelButton->setText(tr("Cancel"));}QMessageBox::StandardButton MessageBox::standardButton(QAbstractButton *button) const{ return (QMessageBox::StandardButton)m_pButtonBox->standardButton(button);}QAbstractButton *MessageBox::clickedButton() const{ return m_pClickedButton;}int MessageBox::execReturnCode(QAbstractButton *button){ int nResult = m_pButtonBox->standardButton(button); return nResult;}void MessageBox::onButtonClicked(QAbstractButton *button){ m_pClickedButton = button; done(execReturnCode(button));}void MessageBox::setDefaultButton(QPushButton *button){ if (!m_pButtonBox->buttons().contains(button)) return; m_pDefaultButton = button; button->setDefault(true); button->setFocus();}void MessageBox::setDefaultButton(QMessageBox::StandardButton button){ setDefaultButton(m_pButtonBox->button(QDialogButtonBox::StandardButton(button)));}void MessageBox::setTitle(const QString &title){ setWindowTitle(title);}void MessageBox::setText(const QString &text){ m_pLabel->setText(text);}void MessageBox::setIcon(const QString &icon){ m_pIconLabel->setPixmap(QPixmap(icon));}void MessageBox::addWidget(QWidget *pWidget){ m_pLabel->hide(); m_pGridLayout->addWidget(pWidget, 0, 1, 2, 1);}
接口说明
CustomWindow
主要对界面的无边框可拖动进行了封装
MessageBox
整体界面布局及事件处理参考了QMessageBox源码,接口包含:设置标题、提示信息、默认按钮及事件触发等操作。
二次封装
针对于各种提示框,我们可以再次进行封装,将常用的提取出来,作为全局函数来使用。
QMessageBox::StandardButton showInformation(QWidget *parent, const QString &title, const QString &text, QMessageBox::StandardButtons buttons, QMessageBox::StandardButton defaultButton){ MessageBox msgBox(parent, title, text, buttons, defaultButton); msgBox.setIcon(":/Images/information"); if (msgBox.exec() == -1) return QMessageBox::Cancel; return msgBox.standardButton(msgBox.clickedButton());}QMessageBox::StandardButton showError(QWidget *parent, const QString &title, const QString &text, QMessageBox::StandardButtons buttons, QMessageBox::StandardButton defaultButton){ MessageBox msgBox(parent, title, text, buttons, defaultButton); msgBox.setIcon(":/Images/error"); if (msgBox.exec() == -1) return QMessageBox::Cancel; return msgBox.standardButton(msgBox.clickedButton());}QMessageBox::StandardButton showSuccess(QWidget *parent, const QString &title, const QString &text, QMessageBox::StandardButtons buttons, QMessageBox::StandardButton defaultButton){ MessageBox msgBox(parent, title, text, buttons, defaultButton); msgBox.setIcon(":/Images/success"); if (msgBox.exec() == -1) return QMessageBox::Cancel; return msgBox.standardButton(msgBox.clickedButton());}QMessageBox::StandardButton showQuestion(QWidget *parent, const QString &title, const QString &text, QMessageBox::StandardButtons buttons, QMessageBox::StandardButton defaultButton){ MessageBox msgBox(parent, title, text, buttons, defaultButton); msgBox.setIcon(":/Images/question"); if (msgBox.exec() == -1) return QMessageBox::Cancel; return msgBox.standardButton(msgBox.clickedButton());}QMessageBox::StandardButton showWarning(QWidget *parent, const QString &title, const QString &text, QMessageBox::StandardButtons buttons, QMessageBox::StandardButton defaultButton){ MessageBox msgBox(parent, title, text, buttons, defaultButton); msgBox.setIcon(":/images/warning"); if (msgBox.exec() == -1) return QMessageBox::Cancel; return msgBox.standardButton(msgBox.clickedButton());}QMessageBox::StandardButton showCritical(QWidget *parent, const QString &title, const QString &text, QMessageBox::StandardButtons buttons, QMessageBox::StandardButton defaultButton){ MessageBox msgBox(parent, title, text, buttons, defaultButton); msgBox.setIcon(":/Images/warning"); if (msgBox.exec() == -1) return QMessageBox::Cancel; return msgBox.standardButton(msgBox.clickedButton());}QMessageBox::StandardButton showCheckBoxQuestion(QWidget *parent, const QString &title, const QString &text, QMessageBox::StandardButtons buttons, QMessageBox::StandardButton defaultButton){ MessageBox msgBox(parent, title, text, buttons, defaultButton); msgBox.setIcon(":/Images/question"); QCheckBox *pCheckBox = new QCheckBox(&msgBox); pCheckBox->setText(text); msgBox.addWidget(pCheckBox); if (msgBox.exec() == -1) return QMessageBox::Cancel; QMessageBox::StandardButton standardButton = msgBox.standardButton(msgBox.clickedButton()); if (standardButton == QMessageBox::Yes) { return pCheckBox->isChecked() ? QMessageBox::Yes : QMessageBox::No; } return QMessageBox::Cancel;}
使用方式
showInformation(this, QStringLiteral("提示"), QStringLiteral("这是一个普通的提示框-Information!"));showQuestion(this, QStringLiteral("提示"), QStringLiteral("这是一个普通的提示框-Question!"));showSuccess(this, QStringLiteral("提示"), QStringLiteral("这是一个普通的提示框-Success!"));showError(this, QStringLiteral("提示"), QStringLiteral("这是一个普通的提示框-Error!"));
源码学习
其实Qt中有很多自带的比较好的效果,里面用了很好的实现方式,建议安装的时候把源码download下来,随时可以研究并学习。例如:D:\Qt\Qt5.5.1\5.5\Src\qtbase\src\widgets\dialogs
下面包含了所有关于dialog的实现-QProgressDialog、QMessageBox、QFileDialog。。。
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