QT自定义外观

“Yeah It’s on. ”

前言

由于QT默认应用程序外观比较普通，而且不同的操作系统标题栏也会不同。因此打算动手更改QT程序外观。
可选方案：

使用QApplication::setStyle(QStyleFactory::create(“Fusion”));调用QT自带style
优点：简单
缺点：可选方案少，不够灵活，不能改变标题栏
使用qss
优点：灵活，可用自定义标题栏使其统一
缺点：复杂

默认外观: 自定义外观:

正文

本文使用qss自定义外观.
首先创建qss文本文件，然后进行样式编辑。(可从网上寻找现成的加以修改) 接下来将写好的qss文件和引用到的图片等资源添加到QT的.qrc文件中。
在main函数中调用：

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	QFile qss(":/stylesheet.qss");
	qss.open(QFile::ReadOnly);
	a.setStyleSheet(qss.readAll());
	qss.close();
	HXWinWrap ww;
	ww.show();
	return a.exec();
}

标题栏需要特殊处理，只有自定义的标题栏才能应用qss样式。因此我们需要隐藏默认标题栏

setWindowFlags(Qt::FramelessWindowHint | windowFlags());

自定义标题栏实现如下:
.h文件

#ifndef TITLE_BAR
#define TITLE_BAR

#include <QWidget>

class QLabel;
class QPushButton;

class TitleBar : public QWidget
{
	Q_OBJECT

public:
	explicit TitleBar(QWidget *parent = 0);
	~TitleBar();

protected:

	// 双击标题栏进行界面的最大化/还原
	virtual void mouseDoubleClickEvent(QMouseEvent *event);

	// 进行鼠界面的拖动
	virtual void mousePressEvent(QMouseEvent *event);

	// 设置界面标题与图标
	virtual bool eventFilter(QObject *obj, QEvent *event);

	private slots:

	// 进行最小化、最大化/还原、关闭操作
	void onClicked();

private:

	// 最大化/还原
	void updateMaximize();

private:
	QLabel *m_pIconLabel;
	QLabel *m_pTitleLabel;
	QPushButton *m_pMinimizeButton;
	QPushButton *m_pMaximizeButton;
	QPushButton *m_pCloseButton;
};

#endif // TITLE_BAR

.cpp文件

#include <QLabel>
#include <QPushButton>
#include <QHBoxLayout>
#include <QEvent>
#include <QMouseEvent>
#include <QApplication>
#include "title_bar.h"

#ifdef Q_OS_WIN
#pragma comment(lib, "user32.lib")
#include <qt_windows.h>
#endif

TitleBar::TitleBar(QWidget *parent)
	: QWidget(parent)
{
	setFixedHeight(30);

	m_pIconLabel = new QLabel(this);
	m_pTitleLabel = new QLabel(this);
	m_pMinimizeButton = new QPushButton(this);
	m_pMaximizeButton = new QPushButton(this);
	m_pCloseButton = new QPushButton(this);

	m_pIconLabel->setFixedSize(32, 32);
	m_pIconLabel->setScaledContents(true);

	m_pTitleLabel->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);

	m_pMinimizeButton->setFixedSize(27, 22);
	m_pMaximizeButton->setFixedSize(27, 22);
	m_pCloseButton->setFixedSize(27, 22);

	m_pTitleLabel->setObjectName("whiteLabel");
	m_pMinimizeButton->setObjectName("minimizeButton");
	m_pMaximizeButton->setObjectName("maximizeButton");
	m_pCloseButton->setObjectName("closeButton");

	m_pMinimizeButton->setToolTip("Minimize");
	m_pMaximizeButton->setToolTip("Maximize");
	m_pCloseButton->setToolTip("Close");

	QHBoxLayout *pLayout = new QHBoxLayout(this);
	pLayout->addWidget(m_pIconLabel);
	pLayout->addSpacing(5);
	pLayout->addWidget(m_pTitleLabel);
	pLayout->addWidget(m_pMinimizeButton);
	pLayout->addWidget(m_pMaximizeButton);
	pLayout->addWidget(m_pCloseButton);
	pLayout->setSpacing(0);
	pLayout->setContentsMargins(5, 0, 5, 0);

	setLayout(pLayout);

	connect(m_pMinimizeButton, SIGNAL(clicked(bool)), this, SLOT(onClicked()));
	connect(m_pMaximizeButton, SIGNAL(clicked(bool)), this, SLOT(onClicked()));
	connect(m_pCloseButton, SIGNAL(clicked(bool)), this, SLOT(onClicked()));
}

TitleBar::~TitleBar()
{

}

void TitleBar::mouseDoubleClickEvent(QMouseEvent *event)
{
	Q_UNUSED(event);

	emit m_pMaximizeButton->clicked();
}

void TitleBar::mousePressEvent(QMouseEvent *event)
{
#ifdef Q_OS_WIN
	if (ReleaseCapture())
	{
		QWidget *pWindow = this->window();
		if (pWindow->isTopLevel())
		{
			SendMessage(HWND(pWindow->winId()), WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
		}
	}
	event->ignore();
#else
#endif
}

bool TitleBar::eventFilter(QObject *obj, QEvent *event)
{
	switch (event->type())
	{
	case QEvent::WindowTitleChange:
	{
		QWidget *pWidget = qobject_cast<QWidget *>(obj);
		if (pWidget)
		{
			m_pTitleLabel->setText(pWidget->windowTitle());
			return true;
		}
	}
	case QEvent::WindowIconChange:
	{
		QWidget *pWidget = qobject_cast<QWidget *>(obj);
		if (pWidget)
		{
			QIcon icon = pWidget->windowIcon();
			m_pIconLabel->setPixmap(icon.pixmap(m_pIconLabel->size()));
			return true;
		}
	}
	case QEvent::WindowStateChange:
	case QEvent::Resize:
		updateMaximize();
		return true;
	}
	return QWidget::eventFilter(obj, event);
}

void TitleBar::onClicked()
{
	QPushButton *pButton = qobject_cast<QPushButton *>(sender());
	QWidget *pWindow = this->window();
	if (pWindow->isTopLevel())
	{
		if (pButton == m_pMinimizeButton)
		{
			pWindow->showMinimized();
		}
		else if (pButton == m_pMaximizeButton)
		{
			pWindow->isMaximized() ? pWindow->showNormal() : pWindow->showMaximized();
		}
		else if (pButton == m_pCloseButton)
		{
			pWindow->close();
		}
	}
}

void TitleBar::updateMaximize()
{
	QWidget *pWindow = this->window();
	if (pWindow->isTopLevel())
	{
		bool bMaximize = pWindow->isMaximized();
		if (bMaximize)
		{
			m_pMaximizeButton->setToolTip(tr("Restore"));
			m_pMaximizeButton->setProperty("maximizeProperty", "restore");
		}
		else
		{
			m_pMaximizeButton->setProperty("maximizeProperty", "maximize");
			m_pMaximizeButton->setToolTip(tr("Maximize"));
		}

		m_pMaximizeButton->setStyle(QApplication::style());
	}
}

最后添加自定义标题栏时特别需要注意不能在QMainWindow中添加(无法放到标题栏位置)。需要外层再套个widget，把标题栏和mainwindow按0:10的比例添加进去（使mainwindow填充满剩余空间）。并实现拖动等响应
HXWinWrap.h

#pragma once
#include <QWidget>

class HXWinWrap : public QWidget {
	Q_OBJECT

public:
	HXWinWrap(QWidget * parent = Q_NULLPTR);
	~HXWinWrap();

	void mouseMoveEvent(QMouseEvent *event);
	void mousePressEvent(QMouseEvent *event);
	void mouseReleaseEvent(QMouseEvent *event);

private:
	bool m_bPressed;
	QPoint m_point;

};

HXWinWrap.cpp

#include "HXWinWrap.h"
#include "title_bar.h"
#include "HXEditorWin.h"
#include <QIcon>
#include <QBoxLayout>
#include <QMouseEvent>
#ifdef Q_OS_WIN
#include <qt_windows.h>
#include <Windowsx.h>
#endif

HXWinWrap::HXWinWrap(QWidget * parent) : QWidget(parent)
, m_bPressed(false)
{
	setWindowFlags(Qt::FramelessWindowHint | windowFlags());
	//setAttribute(Qt::WA_TranslucentBackground, true);

	TitleBar *pTitleBar = new TitleBar(this);
	installEventFilter(pTitleBar);

	resize(1000, 600);
	setWindowTitle("HXEngine Editor");
	setWindowIcon(QIcon(":/icon"));

	QVBoxLayout *pLayout = new QVBoxLayout();
	pLayout->addWidget(pTitleBar,0);
	pLayout->addWidget(HXEditorWin::GetInstance(),10);
	setLayout(pLayout);
}

HXWinWrap::~HXWinWrap() 
{
	
}

// 鼠标相对于窗体的位置 event->globalPos() - this->pos()
void HXWinWrap::mousePressEvent(QMouseEvent *event)
{
	if (event->button() == Qt::LeftButton)
	{
		m_bPressed = true;
		m_point = event->pos();
	}
}

// 若鼠标左键被按下，移动窗体位置
void HXWinWrap::mouseMoveEvent(QMouseEvent *event)
{
	if (m_bPressed)
		move(event->pos() - m_point + pos());
}

// 设置鼠标未被按下
void HXWinWrap::mouseReleaseEvent(QMouseEvent *event)
{
	Q_UNUSED(event);

	m_bPressed = false;
}

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