SwitchButton怎么写
时间: 2024-01-20 22:17:15 浏览: 30
如果你想自己实现一个SwitchButton控件,可以参考以下步骤:
1. 创建一个继承自QPushButton的类,命名为SwitchButton。
2. 在SwitchButton类中添加两个QPixmap类型的变量,用于存储按钮的两种状态的图片。
```cpp
private:
QPixmap m_pixmapOff;
QPixmap m_pixmapOn;
```
3. 在SwitchButton类中添加一个bool类型的变量,用于表示按钮的状态。
```cpp
private:
bool m_checked;
```
4. 在SwitchButton类的构造函数中加载按钮的两种状态的图片,并设置按钮的默认状态为未选中。
```cpp
SwitchButton::SwitchButton(QWidget *parent)
: QPushButton(parent)
{
m_pixmapOff = QPixmap(":/resources/off.png");
m_pixmapOn = QPixmap(":/resources/on.png");
setIcon(m_pixmapOff);
setIconSize(m_pixmapOff.size());
m_checked = false;
}
```
5. 重载SwitchButton类的`mousePressEvent`和`paintEvent`函数。在`mousePressEvent`函数中切换按钮的状态,并重绘按钮;在`paintEvent`函数中根据按钮的状态绘制对应的图片。
```cpp
void SwitchButton::mousePressEvent(QMouseEvent *event)
{
Q_UNUSED(event);
m_checked = !m_checked;
if(m_checked){
setIcon(m_pixmapOn);
} else {
setIcon(m_pixmapOff);
}
emit clicked(m_checked);
}
void SwitchButton::paintEvent(QPaintEvent *event)
{
Q_UNUSED(event);
QPainter painter(this);
painter.setRenderHint(QPainter::Antialiasing);
if(m_checked){
painter.drawPixmap(rect(), m_pixmapOn);
} else {
painter.drawPixmap(rect(), m_pixmapOff);
}
}
```
6. 添加一个`clicked`信号,用于发送按钮状态的变化信号。
```cpp
signals:
void clicked(bool checked);
```
7. 完整的SwitchButton代码如下:
```cpp
#include <QPushButton>
#include <QPainter>
class SwitchButton : public QPushButton
{
Q_OBJECT
public:
SwitchButton(QWidget *parent = nullptr);
signals:
void clicked(bool checked);
protected:
void mousePressEvent(QMouseEvent *event) override;
void paintEvent(QPaintEvent *event) override;
private:
QPixmap m_pixmapOff;
QPixmap m_pixmapOn;
bool m_checked;
};
SwitchButton::SwitchButton(QWidget *parent)
: QPushButton(parent)
{
m_pixmapOff = QPixmap(":/resources/off.png");
m_pixmapOn = QPixmap(":/resources/on.png");
setIcon(m_pixmapOff);
setIconSize(m_pixmapOff.size());
m_checked = false;
}
void SwitchButton::mousePressEvent(QMouseEvent *event)
{
Q_UNUSED(event);
m_checked = !m_checked;
if(m_checked){
setIcon(m_pixmapOn);
} else {
setIcon(m_pixmapOff);
}
emit clicked(m_checked);
}
void SwitchButton::paintEvent(QPaintEvent *event)
{
Q_UNUSED(event);
QPainter painter(this);
painter.setRenderHint(QPainter::Antialiasing);
if(m_checked){
painter.drawPixmap(rect(), m_pixmapOn);
} else {
painter.drawPixmap(rect(), m_pixmapOff);
}
}
```
注意,上述代码中的`:/resources/off.png`和`:/resources/on.png`是指按钮未选中和选中时的图片资源路径,需要在项目的资源文件中添加这两个图片资源。