QT中颜色选择器QColorDialog的重新实现

来源：互联网发布：易语言聊天室源码编辑：程序博客网时间：2024/06/05 02:45

重新实现的颜色选择器如下图所示：

颜色的渐变都是通过拉渐变或者是直接在paintevent中画出来的，根据hsv和rgb两种颜色类型之间的转化来实现。

重载QSlider来实现颜色条花了不少时间，经过别人指点后才恍然大悟，主要还是对这些类的用法和类的实现原理不熟悉造成的，下来得好好的熟悉下。

重载QSlider实现颜色滚动条的代码如下：

    QPainter painter(this);    if(this->orientation() == Qt::Horizontal)    {        const int offset = 5;        QRect rect = this->rect();        rect.setHeight(rect.height() - 5);        QRect sliderRect = rect.adjusted(offset,0,-offset,-rect.height()/2);        painter.setPen(QPen(Qt::black, 0.5));        painter.setBrush(back);        painter.drawRect(sliderRect);        painter.setBrush(gradient());        painter.drawRect(sliderRect);        const double k = (double)(value() - minimum()) / (maximum()-minimum());        int x = (int)((rect.width()-2*offset) * k) + offset;        QPoint tickPts[] = {            QPoint(x,sliderRect.bottom()+1),            QPoint(x-offset,rect.bottom()-1),            QPoint(x+offset,rect.bottom()-1),        };        painter.setBrush(Qt::white);        painter.drawPolygon(tickPts,3);        return;    }    this->setFixedWidth(25);    const int offset = 5;    QRect rect = this->rect();    QRect sliderRect = QRect(rect.left()+offset, rect.top()+offset,                             rect.right()-2*offset,rect.bottom()-2*offset);    const double k = (double)(value() - minimum()) / (maximum()-minimum());    int y = (int)((rect.height()-2*offset) * (1-k)) + offset;    QPoint tickTop[] = {        QPoint(sliderRect.left(), y),        QPoint(rect.left(), y - offset),        QPoint(rect.left(), y + offset)    };    painter.setPen(QPen(Qt::black, 0.5));    painter.drawPolygon(tickTop, 3);    painter.setBrush(back);    painter.drawRect(sliderRect);    painter.setBrush(gradient());    painter.drawRect(sliderRect);    QPoint tickPts[] = {        QPoint(sliderRect.right()+1, y),        QPoint(rect.right(), y - offset),        QPoint(rect.right(), y + offset)    };    painter.setBrush(Qt::white);    painter.drawPolygon(tickPts,3);

详细项目源码已经上传了，需要的可以去瞅瞅，版本QT5.3.

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