QT纯代码实现滑动开关控件

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资源介绍:

开关按钮大家应该很熟悉，在设置里面经常遇到，切换时候的滑动效果比较帅气。通常说的开关按钮，有两个状态：on、off。大部分的开关按钮控件，基本上有两大类，第一类是纯代码绘制，这种对代码的掌控度要求比较高，但是灵活性比较好。第二类是贴图，专业的美工做好的各种状态的背景图片，只需要用代码将该图片画到界面上即可。本示例实现纯代码绘制的开关按钮。

#include "slipbutton.h" #include #include struct SlipButtonPrivate{ int offset = 0; QColor uncheckBackgroundColor = QColor("#FFE0E0E0"); QColor checkedBackgroundColor = QColor("#4da1ff"); bool hover = false; QPropertyAnimation *animation; }; SlipButton::SlipButton(QWidget *parent) : QAbstractButton(parent) , d(new SlipButtonPrivate) { d->animation = new QPropertyAnimation(this, "offset", this); setCheckable(true); setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding); connect(this, &SlipButton::toggled, this, &SlipButton::onStartAnimation); } SlipButton::~SlipButton() { } QSize SlipButton::sizeHint() const { return QSize(100 * 1.8, 100); } QSize SlipButton::minimumSizeHint() const { return QSize(10 * 1.8, 10); } void SlipButton::setCheckedBackgroundColor(const QColor& color) { d->checkedBackgroundColor = color; update(); } QColor SlipButton::checkedBackgroundColor() const { return d->checkedBackgroundColor; } void SlipButton::setUncheckedBackgroundColor(const QColor &color) { d->uncheckBackgroundColor = color; update(); } QColor SlipButton::uncheckedBackgroundColor() const { return d->uncheckBackgroundColor; } int SlipButton::offset() const { return d->offset; } void SlipButton::setOffset(int offset) { d->offset = offset; update(); } double SlipButton::widthMargin() const { return width() / 22.0; } double SlipButton::heightMargin() const { return height() / 22.0; } void SlipButton::paintEvent(QPaintEvent* event) { //qDebug() << offset(); QWidget::paintEvent(event); QPainter painter(this); painter.setPen(Qt::NoPen); painter.setRenderHint(QPainter::Antialiasing); double w = width() - widthMargin() * 2; double h = height() - heightMargin() * 2; // 画背景 QRectF rectSlot((width() - w) / 2, (height() - h) / 2, w, h); double slotRoundness = rectSlot.height() / 2; painter.setBrush(d->uncheckBackgroundColor); painter.drawRoundedRect(rectSlot, slotRoundness, slotRoundness); // 选中情况下，背景变蓝 if(isEnabled() && isChecked()){ QRectF rectSlotFill = rectSlot.adjusted(0, 0, offset() + h - (width() - widthMargin()), 0); painter.setBrush(d->checkedBackgroundColor); painter.drawRoundedRect(rectSlotFill, slotRoundness, slotRoundness); } QRectF rectThumb = QRectF(offset(), (height() - h) / 2, h, h); QColor colorThumbBorder = (d->hover) ? d->checkedBackgroundColor: QColor("#FFA8A8A8"); painter.setBrush(colorThumbBorder); painter.drawEllipse(rectThumb); // 按钮圆点 QColor colorThumb = isEnabled() ? QColor(Qt::white) : QColor("#FFE0E0E0"); painter.setBrush(colorThumb); rectThumb.adjust(1.1, 1.1, -1.1, -1.1); painter.drawEllipse(rectThumb); } void SlipButton::enterEvent(QEvent *event) { QAbstractButton::enterEvent(event); setCursor(Qt::PointingHandCursor); d->hover = true; } void SlipButton::leaveEvent(QEvent* event) { QAbstractButton::leaveEvent(event); d->hover = false; } void SlipButton::resizeEvent(QResizeEvent *event) { QAbstractButton::resizeEvent(event); if(isChecked()){ double h = height() - heightMargin() * 2; setOffset(width() - widthMargin() - h); }else setOffset(widthMargin()); } void SlipButton::onStartAnimation() { double h = height() - heightMargin() * 2; double start = widthMargin(); double end = width() - start - h; if(!isChecked()) qSwap(start, end); // 改变参数值（offset = startValue, offset += interval_1...offset += interval_N） // 改变offset的同时，不断repaint（update） // 直到为目标值（offset = endValue）paint完成； d->animation->setStartValue(start); d->animation->setEndValue(end); d->animation->setDuration(120); d->animation->start(); }

资源文件列表:

SlipButton.zip 大约有7个文件

SlipButton/
SlipButton/main.cpp 172B
SlipButton/mainwindow.cpp 450B
SlipButton/mainwindow.h 217B
SlipButton/slipbutton.cpp 3.85KB
SlipButton/slipbutton.h 1.25KB
SlipButton/SlipButton.pro 1.04KB