QLabel实现柱状条

效果显示

说明：

使用两个QLabel叠加，背景用一个带边框(QFrame::Box)的QLabel，前景则用一个不带边框但使用了palette的可调颜色的QLabel

实现代码(未整理)如下：

pillarbox.h

/**
 *=====================================================================
*    Copyright (c) Power Star, Inc.  All rights reserved.
 *---------------------------------------------------------------------
 *    File Name: pillarbox.h
 *
 *    Description:
 *        draw pillar with rectangle background
 *
 *    History:
 *        2012.04.22    qspy.wang    Initial version
 *
 *=====================================================================
**/
#ifndef _pillarbox_h_
#define _pillarbox_h_
#include <QWidget>
#include <QLabel>
#include <QDebug>

class PillarBox : public QWidget
{
    Q_OBJECT
public:
    PillarBox( QWidget *parent , int max_height, int max_value );
    PillarBox( QWidget *parent , QSize bgsize, int max_value );
    ~PillarBox();

    void setBgSize( QSize size );
    void setBgWidth( int width );
    void setBgHeight( int height );
    void setMaxValue( int max );
    void updatepillar( int val, QColor clr );

private:
    void setfgcolor( QColor clr );

    QLabel *labbg;
    QLabel *labfg;
    int max_divide;
};

#endif /* _pillarbox_h_ */

pillarbox.cpp

/**
*=====================================================================
*    Copyright (c) Power Star, Inc.  All rights reserved.
*---------------------------------------------------------------------
*    File Name: pillarbox.cpp
*
*    Description:
*        draw pillar with rectangle background
*
*    History:
*        2012.04.22    qspy.wang    Initial version
*
*=====================================================================
**/
#ifndef _pillarbox_cpp_
#define _pillarbox_cpp_
#include "pillarbox.h"

PillarBox::PillarBox( QWidget *parent , int max_height, int max_value )
{
labbg = new QLabel(this);

labbg->setAlignment( Qt::AlignHCenter|Qt::AlignTop );
labbg->setFrameShape( QFrame::Box );
labbg->setFixedHeight( max_height );
//labbg->setText("99");

labfg = new QLabel(this);
labfg->setAutoFillBackground( true );

max_divide = max_value;

}

PillarBox::PillarBox( QWidget *parent , QSize bgsize, int max_value )
{
labbg = new QLabel(this);

labbg->setAlignment( Qt::AlignHCenter|Qt::AlignTop );
labbg->setFrameShape( QFrame::Box );
labbg->setFixedSize(bgsize);
//labbg->setFixedHeight( max_height );
//labbg->setText("99");

labfg = new QLabel(this);
labfg->setAutoFillBackground( true );

max_divide = max_value;

}

PillarBox::~PillarBox()
{
if ( labbg )
delete labbg;
if ( labfg )
delete labfg;
}

void PillarBox::setBgSize( QSize size )
{
labbg->setFixedSize(size);
}
void PillarBox::setBgWidth( int width )
{
labbg->setFixedWidth(width);
}
void PillarBox::setBgHeight( int height )
{
labbg->setFixedHeight( height );
}
void PillarBox::setMaxValue( int max )
{
max_divide = max;
}
void PillarBox::updatepillar( int val, QColor clr )
{
int new_y,new_h,height,width;

if( val > max_divide )
val = max_divide;

if( this->width() > labbg->sizeHint().width() )
width = labbg->sizeHint().width();
else
width = this->width();

if( this->height() > labbg->sizeHint().height() )
height = labbg->sizeHint().height();
else
height = this->height();
//labbg->setGeometry(QRect(0,0,this->width(),this->height()));
labbg->resize( width-1, height-1 );
if( val )
labbg->setText(QString::number(val));
else
labbg->setText(QString(""));

new_h = val*height/max_divide;
new_y = height - new_h;
labfg->setGeometry(QRect(1,new_y,width-2,new_h-1));

setfgcolor( clr );

}

void PillarBox::setfgcolor( QColor clr )
{
QPalette palette;
//QColor clr = Qt::green;

palette = labfg->palette();
// clr = QColor::fromRgb(240,240,240);//QColorDialog::getColor(Qt::green, this);
palette.setColor(labfg->backgroundRole(), clr);
//palette.setColor(labfg->foregroundRole(), clr);
labfg->setPalette(palette);
}

#endif /* _pillarbox_cpp_ */