1.4 窗口部件的布局

#include <QApplication>
#include <QPushButton>
#include <QLineEdit>
#include <QSlider>
#include <QSpinBox>
#include <QLabel>

#include <QLayout>
// 包含了<QLayout>就可以不用再包含以下3个头文件了
/*
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QGridLayout>
*/

enum LAYOUT_TYPE
{
	layout_H,	// QHBoxLayout
	layout_V,	// QVBoxLayout
	layout_G	// QGridLayout
};

QLayout * getLayout(LAYOUT_TYPE type);

int main(int argc, char * argv[])
{
	QApplication app(argc, argv);
	
	QWidget * window = new QWidget;
	window->setWindowTitle("Hello Qt!");
	
	
	/***************** 设置顶部菜单选项 ******************/
	QHBoxLayout * Top = (QHBoxLayout *)getLayout(layout_H);
	
	QPushButton * btn_Menu1 = new QPushButton("Start");
	QPushButton * btn_Menu2 = new QPushButton("Online");
	QPushButton * btn_Menu3 = new QPushButton("Setting");
	QPushButton * btn_Menu4 = new QPushButton("Exit");
	
	Top->addWidget(btn_Menu1);
	Top->addWidget(btn_Menu2);
	Top->addWidget(btn_Menu3);
	Top->addWidget(btn_Menu4);
	
	
	/***************** 设置中部左边部件 ******************/
	QVBoxLayout * midLeft = (QVBoxLayout *)getLayout(layout_V);
	
	QHBoxLayout * midLeftLayout1 = (QHBoxLayout *)getLayout(layout_H);
	QLabel * tip1 = new QLabel("Sound Volume");
	// 可以手动设置QSlider的方向，Horizontal是水平,Vertical是垂直
	QSlider * slider1 = new QSlider(Qt::Horizontal);
	slider1->setRange(0, 100);
	slider1->setValue(50);
	midLeftLayout1->addWidget(tip1);
	midLeftLayout1->addWidget(slider1);
	
	QHBoxLayout * midLeftLayout2 = (QHBoxLayout *)getLayout(layout_H);
	QLabel * tip2 = new QLabel("Sound Effect ");
	QSlider * slider2 = new QSlider(Qt::Horizontal);
	slider2->setRange(0, 100);
	slider2->setValue(50);
	midLeftLayout2->addWidget(tip2);
	midLeftLayout2->addWidget(slider2);
	
	midLeft->addLayout(midLeftLayout1);
	midLeft->addLayout(midLeftLayout2);
	
	/***************** 设置中部右边部件 ******************/
	QVBoxLayout * midRight = (QVBoxLayout *)getLayout(layout_V);
	
	QHBoxLayout * midRightLayout1 = (QHBoxLayout *)getLayout(layout_H);
	QLabel * tip3 = new QLabel("Game Levels");
	QSpinBox * spinBox = new QSpinBox();
	spinBox->setRange(1, 10);
	spinBox->setValue(1);
	midRightLayout1->addWidget(tip3);
	midRightLayout1->addWidget(spinBox);
	
	QHBoxLayout * midRightLayout2 = (QHBoxLayout *)getLayout(layout_H);
	QLabel * tip4 = new QLabel("Player Name");
	QLineEdit * Edit = new QLineEdit();
	midRightLayout2->addWidget(tip4);
	midRightLayout2->addWidget(Edit);
	
	midRight->addLayout(midRightLayout1);
	midRight->addLayout(midRightLayout2);
	
	
	// 将中部左右边的布局管理器添加到中部主布局管理器中
	QHBoxLayout * Mid = (QHBoxLayout *)getLayout(layout_H);
	Mid->addLayout(midLeft);
	Mid->addLayout(midRight);
	
	
	/***************** 设置底部部件 ******************/
	QHBoxLayout * Bottom = (QHBoxLayout *)getLayout(layout_H);
	
	QLabel * lab = new QLabel("All right reserved.");
	
	// addStretch()用于添加分隔符，用于占位
	// 就是已有的部件大小已确定为最佳的情况下，
	// 添加分隔符可以将多余的空位占用掉，以免部件调整自身大小以占用所有空位
	// 在lab的前后加上addStretch()可以使得lab居中哦~
	Bottom->addStretch();
	Bottom->addWidget(lab);
	Bottom->addStretch();
	
	/***************** 设置主布局管理器 ******************/
	QVBoxLayout * mainLayout = (QVBoxLayout *)getLayout(layout_V);
	mainLayout->addLayout(Top);
	mainLayout->addLayout(Mid);
	mainLayout->addLayout(Bottom);
	
	window->setLayout(mainLayout);
	window->show();
	
	return app.exec();
}

QLayout * getLayout(LAYOUT_TYPE type)
{
	QLayout * Layout;
	switch (type)
	{
	case layout_H:
		Layout = new QHBoxLayout;
		break;
		
	case layout_V:
		Layout = new QVBoxLayout;
		break;
		
	case layout_G:
		Layout = new QGridLayout;
		break;
	}
	return Layout;
}