qt - QTreeView: column resize from columns and not from headers? -

is there way allow user interactively resize columns when headers hidden?

you can install event filter on table's viewport , implement needed behavior manually. below sample implementation.

header:

#include <qtableview>  class table_cell_resizer : public qobject {   q_object public:   explicit table_cell_resizer(qtableview *view = 0);  protected:   bool eventfilter(qobject* object, qevent* event);  private:   qtableview* m_view;    //max distance between mouse , cell, small enough trigger resize   int m_sensibility;    //variables saving state while dragging   bool m_drag_in_progress;   qt::orientation m_drag_orientation;   int m_drag_section;   int m_drag_previous_pos;    // check if mouse_pos around right or bottom side of cell    // (depending on orientation)   // , return index of cell if found   qmodelindex index_resizable(qpoint mouse_pos, qt::orientation orientation); }; 

source:

#include "table_cell_resizer.h" #include <qmouseevent> #include <qheaderview>  table_cell_resizer::table_cell_resizer(qtableview* view) :   qobject(view), m_view(view) {   m_view->viewport()->installeventfilter(this);   m_view->viewport()->setmousetracking(true);   m_sensibility = 5;   m_drag_in_progress = false; }  bool table_cell_resizer::eventfilter(qobject* object, qevent* event) {   if (object == m_view->viewport()) {     qmouseevent* mouse_event = dynamic_cast<qmouseevent*>(event);     if (mouse_event) {       if (mouse_event->type() == qevent::mousemove) {         if (m_drag_in_progress) { // apply dragging           int delta;           qheaderview* header_view;           if (m_drag_orientation == qt::vertical) {             delta = mouse_event->pos().y() - m_drag_previous_pos;             header_view = m_view->verticalheader();             m_drag_previous_pos = mouse_event->pos().y();           } else if (m_drag_orientation == qt::horizontal) {             delta = mouse_event->pos().x() - m_drag_previous_pos;             header_view = m_view->horizontalheader();             m_drag_previous_pos = mouse_event->pos().x();           }           //using minimal size = m_sensibility * 2 prevent collapsing           header_view->resizesection(m_drag_section,              qmax(m_sensibility * 2, header_view->sectionsize(m_drag_section) + delta));           return true;         } else { // set mouse cursor shape           if (index_resizable(mouse_event->pos(), qt::vertical).isvalid()) {             m_view->viewport()->setcursor(qt::splitvcursor);           } else if (index_resizable(mouse_event->pos(), qt::horizontal).isvalid()) {             m_view->viewport()->setcursor(qt::splithcursor);           } else {             m_view->viewport()->setcursor(qcursor());           }         }       } else if (mouse_event->type() == qevent::mousebuttonpress &&                  mouse_event->button() == qt::leftbutton &&                  !m_drag_in_progress) { // start dragging         if (index_resizable(mouse_event->pos(), qt::vertical).isvalid()) {           m_drag_in_progress = true;           m_drag_orientation = qt::vertical;           m_drag_previous_pos = mouse_event->y();           m_drag_section = index_resizable(mouse_event->pos(), qt::vertical).row();           return true;         } else if (index_resizable(mouse_event->pos(), qt::horizontal).isvalid()) {           m_drag_in_progress = true;           m_drag_orientation = qt::horizontal;           m_drag_previous_pos = mouse_event->x();           m_drag_section = index_resizable(mouse_event->pos(), qt::horizontal).column();           return true;         }       } else if (mouse_event->type() == qevent::mousebuttonrelease &&                  mouse_event->button() == qt::leftbutton &&                  m_drag_in_progress) { // stop dragging         m_drag_in_progress = false;         return true;       }     }   }   return false; }  qmodelindex table_cell_resizer::index_resizable(qpoint mouse_pos, qt::orientation orientation) {   qmodelindex index = m_view->indexat(mouse_pos - qpoint(m_sensibility + 1, m_sensibility + 1));   if (index.isvalid()) {     if (orientation == qt::horizontal) {       if (qabs(m_view->visualrect(index).right() - mouse_pos.x()) < m_sensibility &&           m_view->horizontalheader()->sectionresizemode(index.column()) == qheaderview::interactive) {         return index;       }     } else {       if (qabs(m_view->visualrect(index).bottom() - mouse_pos.y()) < m_sensibility &&           m_view->verticalheader()->sectionresizemode(index.row()) == qheaderview::interactive) {         return index;       }     }   }   return qmodelindex(); } 

usage:

new table_cell_resizer(ui->table); 

user can resize rows , columns using cell area in addition header areas. can hide headers if wish. implementation respects header resize modes, make sure resize mode set qheaderview::interactive headers want resizable. example, can set horizontal header mode interactive , vertical header mode fixed, resulting in resizable columns , fixed rows.