QtQSliderEx

Update QtQSliderEx

QtQSliderEx/ExQSlider.cpp

@@ -0,0 +1,52 @@
+#include "ExQSlider.h"
+#include "ui_ExQSlider.h"
+#include <QPalette>
+
+ExQSlider::ExQSlider(QWidget *parent) :
+    QWidget(parent),
+    ui(new Ui::ExQSlider)
+{
+    ui->setupUi(this);
+
+    //设置QSlider的最大值为255  (默认范围为0~100)
+    ui->sliderRed->setMaximum(255);
+    ui->sliderGreen->setMaximum(255);
+    ui->sliderBlue->setMaximum(255);
+    ui->sliderAlpha->setMaximum(255);
+
+    //初始化QTextEdit的颜色 (否则默认就是白灰色)
+    QColor color;
+    color.setRgb(145, 190, 251, 255);
+    QPalette palette = ui->textColour->palette();
+    palette.setColor(QPalette::Base, color);
+    ui->textColour->setPalette(palette);
+
+    //连接信号与槽，多个信号，对应一个槽函数
+    connect(ui->sliderRed, SIGNAL(valueChanged(int)), this, SLOT(onSetClolor(int)));
+    connect(ui->sliderGreen, SIGNAL(valueChanged(int)), this, SLOT(onSetClolor(int)));
+    connect(ui->sliderBlue, SIGNAL(valueChanged(int)), this, SLOT(onSetClolor(int)));
+    connect(ui->sliderAlpha, SIGNAL(valueChanged(int)), this, SLOT(onSetClolor(int)));
+}
+
+ExQSlider::~ExQSlider()
+{
+    delete ui;
+}
+
+void ExQSlider::onSetClolor(int val)
+{
+    Q_UNUSED(val)
+
+    int nRed = ui->sliderRed->value();             //获取红绿蓝(RGB)的Slider的数值
+    int nGreen = ui->sliderGreen->value();
+    int nBlue = ui->sliderBlue->value();
+    int nAlpha = ui->sliderAlpha->value();
+
+    QColor color;
+    color.setRgb(nRed, nGreen, nBlue, nAlpha);
+    QPalette palette = ui->textColour->palette();   //获取textColour控件的所有颜色值(调色板)
+    palette.setColor(QPalette::Base, color);        //设置textColou的某一角色(即控件)的颜色
+    ui->textColour->setPalette(palette);
+
+    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
+}