54 lines
1.8 KiB
C++
54 lines
1.8 KiB
C++
#include "ExQSlider.h"
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#include "ui_ExQSlider.h"
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#include <QPalette>
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ExQSlider::ExQSlider(QWidget *parent) :
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QWidget(parent),
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ui(new Ui::ExQSlider)
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{
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ui->setupUi(this);
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setWindowTitle(QObject::tr("QSlider的用法"));
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//设置QSlider的最大值为255 (默认范围为0~100)
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ui->sliderRed->setMaximum(255);
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ui->sliderGreen->setMaximum(255);
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ui->sliderBlue->setMaximum(255);
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ui->sliderAlpha->setMaximum(255);
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//初始化QTextEdit的颜色 (否则默认就是白灰色)
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QColor color;
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color.setRgb(145, 190, 251, 255);
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QPalette palette = ui->textColour->palette();
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palette.setColor(QPalette::Base, color);
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ui->textColour->setPalette(palette);
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//连接信号与槽，多个信号，对应一个槽函数
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connect(ui->sliderRed, SIGNAL(valueChanged(int)), this, SLOT(onSetClolor(int)));
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connect(ui->sliderGreen, SIGNAL(valueChanged(int)), this, SLOT(onSetClolor(int)));
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connect(ui->sliderBlue, SIGNAL(valueChanged(int)), this, SLOT(onSetClolor(int)));
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connect(ui->sliderAlpha, SIGNAL(valueChanged(int)), this, SLOT(onSetClolor(int)));
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}
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ExQSlider::~ExQSlider()
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{
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delete ui;
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}
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void ExQSlider::onSetClolor(int val)
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{
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Q_UNUSED(val)
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int nRed = ui->sliderRed->value(); //获取红绿蓝(RGB)的Slider的数值
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int nGreen = ui->sliderGreen->value();
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int nBlue = ui->sliderBlue->value();
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int nAlpha = ui->sliderAlpha->value();
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QColor color;
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color.setRgb(nRed, nGreen, nBlue, nAlpha);
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QPalette palette = ui->textColour->palette(); //获取textColour控件的所有颜色值(调色板)
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palette.setColor(QPalette::Base, color); //设置textColou的某一角色(即控件)的颜色
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ui->textColour->setPalette(palette);
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ui->labRgbVal->setText(QString("RGB(%1, %2, %3, %4)").arg(nRed).arg(nGreen).arg(nBlue).arg(nAlpha)); //时刻显示RGBa的具体值
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}
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