Qt QSlider详解

谁借莪１个温暖的怀抱￠ 2022-10-30 10:24 433阅读 0赞

# 1.QSlider常用API #

//设置最大值、最小值、范围
    setMaximum(int)
    setMinimum(int)
    setRange(int min, int max)
    
    //设置单步长，拖动标尺上的滑块，或按下左右光标键时的最小变化数值。
    setSingleStep(int)
    
    //在滑块上输入焦点时，按PgUp 或 PgDown时变化的数值
    setPageStep(int)
    
    //设置当前值
    setValue(int)
    
    //设置方向，水平或者垂直
    setOrientation(Qt::Orientation)
    
    //设置标尺刻度显示位置
    setTickPosition(TickPosition position)
    
    QSlider::NoTicks            //不显示刻度
    QSlider::TicksBothSides     //标尺两侧都显示刻度
    QSlider::TicksAbove         //标尺上方显示刻度
    QSlider::TicksBelow         //标尺下方显示刻度
    QSlider::TicksLeft          //标尺左侧显示刻度
    QSlider::TicksRight         //标尺右侧显示刻度

# 2.示例-红蓝绿配色 #

![20210218232345343.gif][]

#  3.源码 #

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d6ejk1MzIwMDQ2Mw_size_16_color_FFFFFF_t_70][]

//.h
    
    #ifndef WIDGET_H
    #define WIDGET_H
    
    #include <QWidget>
    
    namespace Ui {
    class Widget;
    }
    
    class Widget : public QWidget
    {
        Q_OBJECT
    
    public:
        explicit Widget(QWidget *parent = 0);
        ~Widget();
    
    private slots:
        void slotSliderValueChanged(int value);
    
    private:
        Ui::Widget *ui;
    };
    
    #endif // WIDGET_H

//.cpp
    #include "widget.h"
    #include "ui_widget.h"
    #include <QColor>
    
    Widget::Widget(QWidget *parent) :
        QWidget(parent),
        ui(new Ui::Widget)
    {
        ui->setupUi(this);
    
        ui->hSA->setRange(0,255);
        ui->hSA->setValue(255);
    
        ui->hSR->setRange(0,255);
        ui->hSG->setRange(0,255);
        ui->hSB->setRange(0,255);
    
        ui->hSA->setTickPosition(QSlider::TicksBelow);
        ui->hSR->setTickPosition(QSlider::TicksBelow);
        ui->hSG->setTickPosition(QSlider::TicksBelow);
        ui->hSB->setTickPosition(QSlider::TicksBelow);
    
        connect(ui->hSA,&QSlider::valueChanged,this,&Widget::slotSliderValueChanged);
        connect(ui->hSR,&QSlider::valueChanged,this,&Widget::slotSliderValueChanged);
        connect(ui->hSG,&QSlider::valueChanged,this,&Widget::slotSliderValueChanged);
        connect(ui->hSB,&QSlider::valueChanged,this,&Widget::slotSliderValueChanged);
    }
    
    Widget::~Widget()
    {
        delete ui;
    }
    
    void Widget::slotSliderValueChanged(int value)
    {
        Q_UNUSED(value);
        QColor color;
        int R = ui->hSR->value();
        int G = ui->hSG->value();
        int B = ui->hSB->value();
        int A = ui->hSA->value();
    
        color.setRgb(R,G,B,A);
        QPalette pal = ui->textEdit->palette();
        pal.setColor(QPalette::Base,color);
        ui->textEdit->setPalette(pal);
    }

[20210218232345343.gif]: /images/20221024/211857c8d325442aadbd8d1e5f805aae.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d6ejk1MzIwMDQ2Mw_size_16_color_FFFFFF_t_70]: /images/20221024/a3661ec9fb0e40b1b96afc26d0e591e9.png