提供QTableWidget和QHeaderView来调节QTextTable的栏宽 写代码前感觉应该很简单。真正写的时候却遇到了不少问题，调试过程中也发现了很多写代码前没有考虑到的细节。以边学边写，不断调试，搞了好多天了。 现在回过来看，代码确实很简单。但有些细节还是没有处理到。如表格在文本的第一行时，此调节控件显示不出来。还有些槽函数可能要变为公用的。 mytableadjustor.h - #ifndef MYTABLEADJUSTOR_H
#define MYTABLEADJUSTOR_H
#include <QTableWidget>
#include <QHeaderView>
#include <QTextEdit>
#include <QMouseEvent>
#include <QTextCursor>
#include <QTextTable>
#include <QScrollBar>
#include <QDebug>
#define ADJUSTOR_HEIGHT 35
class MyTableAdjustor : public QTableWidget
{
Q_OBJECT
public:
explicit MyTableAdjustor(QTextEdit *parent = 0);
signals:
public slots:
private slots:
void showTableAdjustor();
void adjustTableColumnWidth();
void repositionAdjustor();
protected:
void mousePressEvent(QMouseEvent *event);
void mouseMoveEvent(QMouseEvent *event);
void resizeEvent(QResizeEvent *event);
private:
bool leftMouseButtonPressed;
QTextEdit *parentTextEditor;
QTextTable *currentTable;
QTextTable *previousTable;
};
#endif // MYTABLEADJUSTOR_H
mytableadjustor.cpp - #include "mytableadjustor.h"
MyTableAdjustor::MyTableAdjustor(QTextEdit *parent) :
QTableWidget(0,0,parent)
{
setFixedHeight(ADJUSTOR_HEIGHT);
setMinimumWidth(26);
setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
setVisible(false);
viewport()->setToolTip(tr("左右拖动鼠标可调整表格的整体大小"));
viewport()->setCursor(Qt::SizeHorCursor);
horizontalHeader()->setCascadingSectionResizes(true);
horizontalHeader()->setResizeMode(QHeaderView::Interactive);
parentTextEditor = parent;
previousTable = 0;
connect(parentTextEditor,SIGNAL(cursorPositionChanged()),this,SLOT(showTableAdjustor()));
connect(horizontalHeader(),SIGNAL(sectionResized(int,int,int)),this,SLOT(adjustTableColumnWidth()));
connect(parentTextEditor->verticalScrollBar(),SIGNAL(valueChanged(int)),this,SLOT(repositionAdjustor()));
}
////////////////// protected function //////////////////////////////
void MyTableAdjustor::mousePressEvent(QMouseEvent *event)
{
if (event->button() == Qt::LeftButton)
leftMouseButtonPressed = true;
}
void MyTableAdjustor::mouseMoveEvent(QMouseEvent *event)
{
if (leftMouseButtonPressed)
resize(event->x() - rect().left(), ADJUSTOR_HEIGHT);
}
void MyTableAdjustor::resizeEvent(QResizeEvent *event)
{
int lastColumnWidthDiff = horizontalHeader()->length() - viewport()->width();
int lastColumnNumber = columnCount() - 1;
int originalLastColumnWidth = horizontalHeader()->sectionSize(lastColumnNumber);
horizontalHeader()->resizeSection(lastColumnNumber,originalLastColumnWidth - lastColumnWidthDiff);
repositionAdjustor();
}
////////////////// private slots //////////////////////////////
void MyTableAdjustor::showTableAdjustor()
{
currentTable = parentTextEditor->textCursor().currentTable();
setVisible(currentTable);
if (currentTable && (currentTable != previousTable)){
QTextTableFormat tableFormat = currentTable->format();
int columnsCount = tableFormat.columns();
qreal borderWidth = tableFormat.border() * 2;
int totalLength = 0;
int sectionLength = 0;
setColumnCount(columnsCount);
for (int i = 0; i<columnsCount; i++){
sectionLength = (int)tableFormat.columnWidthConstraints().value(i).rawValue() + borderWidth;
horizontalHeader()->resizeSection(i,sectionLength);
totalLength += sectionLength;
}
resize(totalLength, ADJUSTOR_HEIGHT);
repositionAdjustor();
}
previousTable = currentTable;
}
void MyTableAdjustor::adjustTableColumnWidth()
{
QTextTableFormat tableFormat = currentTable->format();
QVector<QTextLength> columnWidth;
for(int i = 0; i < tableFormat.columns(); i++){
columnWidth << QTextLength(QTextLength::FixedLength,
horizontalHeader()->sectionSize(i) - tableFormat.border() * 2);
}
tableFormat.setColumnWidthConstraints(columnWidth);
currentTable->setFormat(tableFormat);
}
void MyTableAdjustor::repositionAdjustor()
{
if (!isHidden()){
QPoint tablePosition(parentTextEditor->cursorRect(currentTable->firstCursorPosition()).topLeft());
qreal borderWidth = currentTable->format().border() * 2;
move(tablePosition - QPoint(borderWidth,ADJUSTOR_HEIGHT + borderWidth));
}
}
////////////////// private function //////////////////////////////
|
