前段时间项目上的要求,要实现一个列表(见下图1)。类似网页上的列表,可以通过选中标题栏的复选框,实现全选或者全不选的功能。但是看了很久,都没看到Qt哪个方法可以实现在标题栏添加控件。
图1
要实现这样的效果,也许我们首先想到的,就是直接生成一个CheckBox,用setGeometry()设置它的位置就可以了。当然这样是可以的,也是最简单的。但是有个问题:这样做,CheckBox就固定死了,而且没有跟标题栏连城一体,不会随着标题栏一起移动。结果如下图2
显然,这样的效果有点不爽。
后面想到了一种比较好的办法,就是自定义一个heander。通过setHeader()设置给列表。下面是我的部分实现代码
- class MyCheckBox:public QCheckBox
- {
- Q_OBJECT
- public:
- MyCheckBox(QWidget *parent /*= NULL*/):QCheckBox(parent)
- {
- }
- ~MyCheckBox(){}
- protected:
- void mouseMoveEvent(QMouseEvent *e)
- {
- //HeaderView::mouseMoveEvent(e);
- QRect boxRect = this->rect();
- QPoint pos = e->pos();
- if (boxRect.contains(pos))
- {
- setCursor(Qt::ArrowCursor);
- }
- }
- private:
- };
- class HanderView :public QHeaderView
- {
- Q_OBJECT
- public:
- HanderView( Qt::Orientation orientation,QWidget *parent /*= NULL*/):QHeaderView(orientation,parent)
- {
- m_pCheckBox = new MyCheckBox(this);
- hasPaint = false;
- }
- ~HanderView()
- {
- }
- private slots:
- protected:
- void resizeEvent(QResizeEvent *event)
- {
- int leftPos = this->sectionViewportPosition(0);
- m_pCheckBox->setGeometry(leftPos + 5,0,50,this->height());
- int sectionMinSize = 50;
- this->setMinimumSectionSize(sectionMinSize + sectionSizeFromContents(0).width());
- this->setDefaultSectionSize(sectionMinSize + sectionSizeFromContents(0).width());
- }
- void paintEvent(QPaintEvent *e)
- {
- QHeaderView::paintEvent(e);
- int leftPos = this->sectionViewportPosition(0);
- m_pCheckBox->setGeometry(leftPos + 5,0,50,this->height());
- }
- private:
- MyCheckBox *m_pCheckBox;
- bool hasPaint;
- };
- class MyTreeWidget:public QTreeWidget
- {
- Q_OBJECT
- public:
- MyTreeWidget(QWidget *parent = NULL);
- ~MyTreeWidget();
- protected:
- private:
- HanderView *m_pHeader;
- };
- MyTreeWidget::MyTreeWidget(QWidget *parent /* = NULL */):QTreeWidget(parent)
- {
- m_pHeader = new HanderView(Qt::Horizontal,parent);
- this->setHeader(m_pHeader);
- QStringList list ;
- list<<"文件名"<<"文件大小"<<"文件类型"<<"创建日期";
- this->setHeaderLabels(list);
- header()->setDefaultAlignment(Qt::AlignCenter);
- }
1、这里是为了保证鼠标在标题栏上是箭头状,因为Box靠近分割线,不这么做的话,鼠标移动到Box上面的时候也可能是Qt::SplitHCursor。这样对用户感觉有点不爽。大家可以试试注释这些代码看看就知道了
- void mouseMoveEvent(QMouseEvent *e)
- {
- //HeaderView::mouseMoveEvent(e);
- QRect boxRect = this->rect();
- QPoint pos = e->pos();
- if (boxRect.contains(pos))
- {
- setCursor(Qt::ArrowCursor);
- }
2、
- int leftPos = this->sectionViewportPosition(0);
- m_pCheckBox->setGeometry(leftPos + 5,0,50,this->height());
- int sectionMinSize = 50;
- this->setMinimumSectionSize(sectionMinSize + sectionSizeFromContents(0).width());
- this->setDefaultSectionSize(sectionMinSize + sectionSizeFromContents(0).width());
设置列的最小宽度。
- sectionSizeFromContents(0).width()这个可以根据标题栏的字符的长度调整列的宽度。
3、
- int leftPos = this->sectionViewportPosition(0);
- m_pCheckBox->setGeometry(leftPos + 5,0,50,this->height());
这里保证移动滚动条的时候,Box会跟着标题栏动。
效果如图3,图4
图3 图4
4、我们也可以把Box放在其他列,改一下index就可以了
- int leftPos = this->sectionViewportPosition(1);
- m_pCheckBox->setGeometry(leftPos + 5,0,50,this->height());
- int sectionMinSize = 50;
- this->setMinimumSectionSize(sectionMinSize + sectionSizeFromContents(1).width());
- this->setDefaultSectionSize(sectionMinSize + sectionSizeFromContents(1).width());
- int leftPos = this->sectionViewportPosition(1);
- m_pCheckBox->setGeometry(leftPos + 5,0,50,this->height());
结果如图5,图6
图5 图6
http://blog.****.net/hai200501019/article/details/9150691