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QT QTableView QTableWidget 复杂表头(多行表头) 、(冻结、固定特定的行)
demo下载地址在最后
================================分割线======================================
对于所有前端开发人员会留意到,我们在开发过程中对于表格使用频率还是挺高的,使用QT框架开发时候我们使用QTableView或者QTableWidget创建表格。
其中表格分为 表格头与表格体:
对于简单地表格,我们可以设置表头来满足我们的要求(当然也可以隐藏表头),不过对于定制化的表头,我们能做的不是特别多。特别是对于复杂的表头,使用自带的表头,无论怎么设置都不太可能达到需求。例如我最近接到的一个项目,需求是:
我们分析一下这个表格有什么特点:
1.表头不是简单的一行,而是两行。
2.表头有单元格的合并。
3.部分表头中间有使用渐变的分隔线且分割线不是上下充满表格的。
如果能解决上面三个问题,我们基本都可以把这个表格做出来了。这个表头明显是一个比较复杂的表头。对于只对QT提供的API或者CSS上面三个问题,没有一个能够解决的。
这时候可能会有老师提出解决办法:给header 设置itemDelegate,自己在itemDelegate中重写paintEvent,自己画表头。 因为我们都知道,自己画单元格,要更灵活,满足更多需求。但是我们平时都是对单元格进行重绘,并不是对header的单元格进行重绘。于是就去搜索QT的帮助文档,惊喜的发现居然有设置itemdelegate的API,心里觉得有戏于是创建 ItemDelegate类,对header进行设置如下
tableWidget->horizontalHorizon()->setItemDelegate(new ItemDelegate());
可是结果却是令人失望的,没有一点效果。于是反身去查找QT 关于这部分的介绍,终于找到了原因:
结果就显而易见了,对于headerView,并不能使用ItemDelegate进行重绘。
那么我们就要另外想办法了,经过分析,刚开始提出了两种方案:
解决方案 描述 优点 缺点 方案一 - 隐藏表头
- 前两行当做表头
- 内容行从第三行开始
- 对表格设置itemDelegate,对前两行的表头进行重绘
- 一个QTableWidget,实现起来方便一些。
- 当出现滚动条,表头会随着着内容表格个移动,不符合大众习惯。
- 改变了内容表格的整个原有序列,所有的行数都需要比原来大2,对所有的API进行重写工作难不高,复杂度比较高。
方案二 - 使用一个QTableWidget命名为m_frozonTableWgt作为表头。
- 使用另外一个QTableWidget作为内容显示的表格。
- m_frozonTableWgt隐藏表头、隐藏滚动条、只显示2行的内容表格、显示到内容表格上方、只占据内容表的表头高度、设置ItemDelegate进行重绘。
- 内容表格,显示表头,高度设置成m_frozonTableWgt前两行的高度。
- 最终效果更好,体验更好。
- 需要对2个QTableWidget进行操作,比较麻烦。
- 需要对表头的QTableWidget进行锁死(固定)。
- 3.需要对2个QtableWidget进行联动设置
总结一下就是:
- 第一种方案比较简单,但是最终体验效果不太好。
- 第二种方案实现起来比较复杂,但是最终体验效果比较好。
本着成就客户与自我成长的态度,最终选择了第二种解决方案。
我们首先要做的就是创建一个继承于QTableWidget的一个类,命名为TDMSummaryTableWgt。
class TDMSummaryTableWgt : public QTableWidget
然后需要在TDMSummaryTableWgt类中,声明另外一个用于header的QTableWidget,命名为 m_frozenTableWgt;
-
private:
-
QTableWidget *m_frozenTableWgt; // 使用TableWidget 作为header,并冻结
这个m_frozenTableWgt,就是作为表头,并且固定位置,不随着滚动条移动位置。
这个时候我们只需要解决两个问题,就可以搞定表头了:
一.表头位置锁定(固定、锁死)。
二.重绘表头。
对于第一个问题,表头位置的固定。我们应该从哪些方面考虑来解决?
1.从界面初始化开始,我们应当让表头m_frozenTableWgt具备: 不显示表头,不显示滚动条、设置rowcount为2行并隐藏2行后所有的元素、设置窗口层次在TDMSummaryTableWgt之前、对单元格进行合并等要素。
这里要特别注意的是,m_frozenTableWgt与TDMSummaryTableWgt设置的列数应该完全一致,每一列的尺寸与伸展方案也应该完全一致。
-
void TDMSummaryTableWgt::initFrozenFrame()
-
{
-
m_frozenTableWgt = new QTableWidget( this);
-
-
m_frozenTableWgt->horizontalHeader()->setVisible( false); //表头不可见
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m_frozenTableWgt->verticalHeader()->setVisible( false); //表头不可见
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m_frozenTableWgt->setShowGrid( false); //网格线不可见
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m_frozenTableWgt->setEditTriggers(QAbstractItemView::NoEditTriggers); //设置单元格不可编辑
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m_frozenTableWgt->horizontalHeader()->setStretchLastSection( true); //最后一个单元格扩展
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m_frozenTableWgt->setFocusPolicy(Qt::NoFocus); //解决选中虚框问题
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m_frozenTableWgt->setFrameShape(QFrame::NoFrame); //去除边框 尴尬
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m_frozenTableWgt->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff); //隐藏滚动条
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m_frozenTableWgt->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff); //
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m_frozenTableWgt->setHorizontalScrollMode(ScrollPerPixel);
-
-
m_frozenTableWgt->setItemDelegate( new ItemDelegate( 0)); //设置绘画代理(主要在代理中画出来header)
-
-
viewport()->stackUnder(m_frozenTableWgt); //设置窗口层次
-
-
m_frozenTableWgt->setColumnCount( 10); //header10列
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m_frozenTableWgt->setRowCount( 2); //header2行
-
-
m_frozenTableWgt->setRowHeight( 0, 42); //第一行设置高度42px
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m_frozenTableWgt->setRowHeight( 1, 42); //第二行设置高度42px
-
-
for ( int row = 2; row < m_frozenTableWgt->rowCount(); ++row) //隐藏2行后的行
-
m_frozenTableWgt->setRowHidden(row, true);
-
-
//===================设置header内容=================//
-
//合并单元格
-
m_frozenTableWgt->setSpan( 0, 0, 2, 1); //老师ID
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m_frozenTableWgt->setSpan( 0, 1, 2, 1); //老师姓名
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m_frozenTableWgt->setSpan( 0, 2, 2, 1); //老师姓名
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m_frozenTableWgt->setSpan( 0, 3, 1, 4); //最新日期(8月20)
-
m_frozenTableWgt->setSpan( 0, 7, 1, 2); //前一日(8月19)
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m_frozenTableWgt->setSpan( 0, 9, 2, 1); //操作
-
-
m_frozenTableWgt->setItem( 0, 0, new QTableWidgetItem( "老师ID"));
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m_frozenTableWgt->setItem( 0, 1, new QTableWidgetItem( "老师姓名"));
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m_frozenTableWgt->setItem( 0, 2, new QTableWidgetItem( "老师姓名"));
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m_frozenTableWgt->setItem( 0, 3, new QTableWidgetItem( "8月20日"));
-
m_frozenTableWgt->setItem( 0, 7, new QTableWidgetItem( "8月19日"));
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m_frozenTableWgt->setItem( 0, 9, new QTableWidgetItem( "操作"));
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m_frozenTableWgt->setItem( 1, 3, new QTableWidgetItem( "续报率"));
-
m_frozenTableWgt->setItem( 1, 4, new QTableWidgetItem( "新学员续报率"));
-
m_frozenTableWgt->setItem( 1, 5, new QTableWidgetItem( "续报增长人数"));
-
m_frozenTableWgt->setItem( 1, 6, new QTableWidgetItem( "续报增长率"));
-
m_frozenTableWgt->setItem( 1, 7, new QTableWidgetItem( "续报增长率"));
-
m_frozenTableWgt->setItem( 1, 8, new QTableWidgetItem( "新学员续报率"));
-
-
//连接信号槽。用于滚动条联动
-
connect(m_frozenTableWgt->verticalScrollBar(), &QAbstractSlider::valueChanged,
-
verticalScrollBar(), &QAbstractSlider::setValue);
-
connect(verticalScrollBar(), &QAbstractSlider::valueChanged,
-
m_frozenTableWgt->verticalScrollBar(), &QAbstractSlider::setValue);
-
-
updateFrozenTableGeometry(); //更新位置
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m_frozenTableWgt->show();
-
}
2.除了上面的考虑之外,我们就需要考虑m_frozenTableWgt与TDMSummaryTableWgt之间的联动问题了,主要包括表格的尺寸变化、滚动条移动、界面平移等问题。
我们首先要写一个方法,来确定m_frozenTableWgt与TDMSummaryTableWgt位置。
-
void TDMSummaryTableWgt::updateFrozenTableGeometry()
-
{
-
m_frozenTableWgt->setGeometry(frameWidth(),
-
frameWidth(),
-
viewport()->width(),
-
horizontalHeader()->height());
-
-
}
我们需要重写3个上面提到问题解决方案的函数,在每个方法里都要重新执行updateFrozenTableGeometry();
-
protected:
-
/**
-
* @brief resizeEvent 重载虚函数 resize事件,同时更新m_frozenTableWgt的位置
-
* @param event
-
*/
-
virtual void resizeEvent(QResizeEvent *event) Q_DECL_OVERRIDE;
-
-
/**
-
* @brief moveCursor 重载虚函数 鼠标移动事件
-
* @param cursorAction
-
* @param modifiers
-
* @return
-
*/
-
virtual QModelIndex moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers) Q_DECL_OVERRIDE;
-
-
/**
-
* @brief scrollTo TableWidget移动事件
-
* @param index
-
* @param hint
-
*/
-
void scrollTo (const QModelIndex & index, ScrollHint hint = EnsureVisible) Q_DECL_OVERRIDE;
对上面这三个虚函数,我们需要特别注意的重点是moveCursor方法。这个方法里我们应该重点关注鼠标向上移动的情景:只有当鼠标向上移动,并且TDMSummaryTableWgt还未显示到第一行,并且可视区域的顶点应该小于m_frozenTableWgt的第一行,才允许继续向上移动:
-
QModelIndex TDMSummaryTableWgt::moveCursor(QAbstractItemView::CursorAction cursorAction, Qt::KeyboardModifiers modifiers)
-
{
-
QModelIndex current = QTableView::moveCursor(cursorAction, modifiers);
-
-
if (cursorAction == MoveUp && current.row() > 0
-
&& visualRect(current).topLeft().y() < m_frozenTableWgt->rowHeight( 1) ){
-
const int newValue = verticalScrollBar()->value() + visualRect(current).topLeft().y()
-
- m_frozenTableWgt->rowHeight( 0) - m_frozenTableWgt->rowHeight( 1);
-
verticalScrollBar()->setValue(newValue);
-
}
-
return current;
-
}
做完上面这几部,基本解决了第一个问题,就是将m_frozenTableWgt的固定行(冻结)的功能。
要完成m_frozenTableWgtde 的样式重绘,就是第二个要解决的问题了。
这个问题,我们要新建一个继承于QStyledItemDelegate的代理类,我们叫ItemDelegate。并且重写paint方法,在paint方法里绘制m_frozenTableWgt;
m_frozenTableWgt->setItemDelegate(new ItemDelegate(0));//设置绘画代理(主要在代理中画出来header)
-
class ItemDelegate : public QStyledItemDelegate
-
{
-
Q_OBJECT
-
public:
-
ItemDelegate( int type, QObject *parent= 0);
-
-
void paint(QPainter *painter,
-
const QStyleOptionViewItem &option, const QModelIndex &index) const;
-
-
private:
-
-
};
在paint方法中,根据每个单元格的背景不同进行绘制背景
-
int rowIndex = index.row(); //行号
-
int colIndex = index.column(); //列号
-
if (rowIndex == 0 || rowIndex == 1) //前两行作为header
-
{
-
//背景
-
QColor color;
-
-
if (rowIndex == 0 && (colIndex == 0 || //老师ID
-
colIndex == 1 || //老师姓名
-
colIndex == 2 || //课程类型
-
colIndex == 9)) //操作
-
{
-
color.setRgb( 231, 238, 251);
-
}
-
else if ((rowIndex == 0 && colIndex == 3) || //8月20日
-
(rowIndex == 1 && (colIndex == 3 || //续报率
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colIndex == 4 || //新学员续报率
-
colIndex == 5 || //续报增长人数
-
colIndex == 6))) //续报增长率
-
{
-
color.setRgb( 214, 228, 253);
-
}
-
else if ((rowIndex == 0 && colIndex == 7) || //8月19日
-
(rowIndex == 1 && (colIndex == 7 || //续报率
-
colIndex == 8))) //新学员续报率
-
{
-
color.setRgb( 203, 221, 255);
-
}
-
-
//绘制背景
-
painter->setPen(color);
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painter->setBrush(QBrush(color));
-
painter->drawRect(option.rect);
根据每个单元格要求绘画是否需要右侧的渐变的分隔线。
-
//右侧spacer
-
if ((rowIndex == 0 && (colIndex == 0 || colIndex == 1) )) {
-
int startX = option.rect.right();
-
int startY = option.rect.y() + (option.rect.height() - 40) / 2;
-
int endX = startX;
-
int endY = startY + 40;
-
QLinearGradient linearGradient(startX, startY, endX, endY);
-
linearGradient.setColorAt( 0, QColor( 164, 188, 240, 0));
-
linearGradient.setColorAt( 0.5, QColor( 164, 188, 240, 255));
-
linearGradient.setColorAt( 1, QColor( 164, 188, 240, 0));
-
painter->setBrush(linearGradient);
-
painter->drawRect(option.rect.right()- 2, startY, 2, 40);
-
-
}
-
else if (rowIndex == 1 && (colIndex == 3 ||
-
colIndex == 4 ||
-
colIndex == 5 ||
-
colIndex == 7 )) {
-
-
int startX = option.rect.right();
-
int startY = option.rect.y() + (option.rect.height() - 28) / 2;
-
int endX = startX;
-
int endY = startY + 28;
-
QLinearGradient linearGradient(startX, startY, endX, endY);
-
linearGradient.setColorAt( 0, QColor( 164, 188, 240, 0));
-
linearGradient.setColorAt( 0.5, QColor( 164, 188, 240, 255));
-
linearGradient.setColorAt( 1, QColor( 164, 188, 240, 0));
-
painter->setBrush(linearGradient);
-
painter->drawRect(option.rect.right()- 2, startY, 2, 28);
-
}
最后将每个单元格的字体画出来
-
//字体
-
painter->setPen(QColor( 51, 51, 51));
-
QTextOption op;
-
op.setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
-
-
QFont font;
-
font.setFamily( "Microsoft YaHei");
-
font.setPixelSize( 14);
-
font.setBold( true);
-
painter->setFont(font);
-
painter->drawText(option.rect, index.data(Qt::DisplayRole).toString(), op);
这样就解决了header里面的难题。
=================================分割线========================================
demo下载地址:https://download.youkuaiyun.com/download/xiezhongyuan07/10694125 (没有积分的小伙伴评论上写邮箱,我发给你们)
=================================分割线========================================
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2014-5-25阅读379 评论0
各种软件设计中,表格的使用非常频繁,下面介绍的是关于QTableWidget的使用以及常用属…
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在Qt的开发过程中,时常会用到表单(QTableWidget)这个控件,网上的资料不少,但是都是最基本的,有一些比较经常遇到的问…
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ui.tableWidget_grid->horizont…
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QStringList hea…
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行标题的设置
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来自: Code搬运工
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#include
#include
#include class CCheckBoxHeaderView : public QHeade…
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来自: 阳光柠檬_的技术笔记
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//喜欢
resizeColumnToContents(SEQ_FAVOURITE);
…
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来自: DLove0502的专栏
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tableWidget = new QTableWidget(this);
tableWidget->setRowCount(10);
tableW…
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来自: fanyun的博客
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tablewidg…
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来自: HSL、部落
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FriendTable->setFrameShape(QFrame::NoFrame); //设置边框
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来自: leo115的专栏
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基本外观设置
FriendTab…
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来自: u014430031的博客
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表格类是Qt中常用的控件,如QTableWidget,QTableView。QTableWidget是QTableView的子类,主要区别是QTableView可以使用自定义的数据模型来显示…
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来自: hebbely的博客
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来自: u012765446的专栏
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void TradeTableView::InitView()
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QHe…
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来自: 证券指标的专栏
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来自: CoolCode
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QTableVie…
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在ArcGIS Online当中如何构架自己的应用程序模板,我们得先要了…
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来自: ArcGIS产品与技术专栏
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这里我下载安装的是jdk-7u51-windows-i586,如果你没有请到Oracle官网下载;
【我的电脑】-【高级系统设置】-【环境变量】-系统变量中的Path添加…
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http://www.pythonware.com/products/pil/
2.解压后,进入到目录下
cd /Users/jianan/Dow…
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来自: 专注于cocos+unity+服务器全栈
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因为需要用,所以才翻译了这个文档。但总归赖于英语水平很有限,翻译出来的中文有可能…
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请看一下这个类都有哪些功能:
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来自: 李坤 大米时代 第五期
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版本号:V3.8.0.11638
大小: 107MB/7z格式压缩,18…
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来自: VBcom的专栏
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相关函数 open,fclose
表头文件 #include
定义函数 FILE * fopen(const char * path,const char * mode)…
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来自: 独旅天涯
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来自: Mr_Alex
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Git(the stupid content tracker)是一个源自Linux内核项目的源码管理工具。和传统的CVS、SVN不同,git是一个分布式源码管理工具。
Git命令…
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来自: No talent but persistence
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CommonFunc.caculate={
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来自: 夕颜的专栏
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