Qtabwidget Implement similar QQ chat window (drag to detach a new window)

New version of the QQ Chat window can be implemented to drag, separate a new window. Browsers and other software can also achieve similar operations. So a whim wanted to use QT to achieve similar functions. Want to use Qtabwidget direct realization is very difficult, carefully read the source code, found that Qtabwidget internal is composed of Qstackedwidget and qtabbar combination of implementation. So it's natural to think that as long as the subclass inheriting the Qtabbar is re-implementing Qtabbar's

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1. void Mousepressevent (Qmouseevent *e);
2. void Mousemoveevent (Qmouseevent *e);
3. void Mousereleaseevent (Qmouseevent *e);

These three methods, and then the definition of the Tabbar set to Qtabwidget is almost. However, there is a problem, Qtabwidget Settabbar method is protected, so we have to customize a qtabwidget subclass, in the subclass called Settabbar. Here's my simple implementation:

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2. Class Mytabbar: PublicQtabbar
4. {
6. Q_object
8. Public
10. Mytabbar (Qwidget *parent = NULL);
12. ~mytabbar ();
14. Protected
16. void Mousepressevent (Qmouseevent *e);
18. void Mousemoveevent (Qmouseevent *e);
20. void Mousereleaseevent (Qmouseevent *e);
24. Signals:
26. void Stardragtab (int index);
28. void Enddragtab ();
30. Private
32. void drag ();
36. bool M_isdrag;
38. Qpoint M_mousepresspoint;
40. Qpoint M_mousereleasepoint;
44. };

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1. void Mytabbar::mousemoveevent (Qmouseevent *e)
2. {
3. int index = this->currentindex ();
5. if (M_isdrag)
6. {
7. Qpoint point = E->pos ();

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2. //Drag the vertical distance greater than bar height, then create a new window, this should be better understood AH
4. if (Qabs (M_mousepresspoint.y ()-Point.y ()) > this->height ())
6. {
8. Emit Stardragtab (index);
10. }
12. }
14. Qtabbar::mousemoveevent (e);
16. }
20. void Mytabbar::mousepressevent (Qmouseevent *e)
22. {
24. if (e->button () = = Qt::leftbutton)
26. {
28. M_isdrag = true;
30. M_mousepresspoint = E->pos ();
32. }
34. Qtabbar::mousepressevent (e);
36. }
40. void Mytabbar::mousereleaseevent (Qmouseevent *e)
42. {
44. if (e->button () = = Qt::leftbutton)
46. {
48. M_mousereleasepoint = E->pos ();
50. if (Qabs (M_mousepresspoint.y ()-M_mousereleasepoint.y ()) > this->height ())
52. {
54. Emit Enddragtab ();
56. }
58. }
60. Qtabbar::mousereleaseevent (e);
62. }

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2. Class Mytabwidget: Publicqtabwidget
4. {
6. Q_object
10. Public
12. Mytabwidget (Qwidget *parent = NULL);
16. ~mytabwidget ();
22. Private Slots:
24. void Stardrag (int index);
26. void EndDrag ();
30. Private
32. Mytabbar *m_ptabbar;
34. QString M_dragtablabel;
36. Qwidget *m_pdragwidget;
38. int m_dragindex;
44. };

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2. Mytabwidget::mytabwidget (qwidget *parent/* = null*/): Qtabwidget (parent)
4. {
6. This->setacceptdrops (true);
8. Setmousetracking (true);
10. M_ptabbar = New Mytabbar (this);
12. M_ptabbar->setmovable (true);
14. Settabbar (M_ptabbar); //Set the custom bar to Tabwidget
16. M_pdragwidget = NULL;
18. Connect (m_ptabbar,signal (stardragtab (int)),This,slot (Stardrag (int)));
20. Connect (m_ptabbar,signal (Enddragtab ()),This,slot (EndDrag ()));
22. }
26. void Mytabwidget::stardrag (int index)
28. {
30. M_dragtablabel = This->tabtext (index);
32. M_pdragwidget = this->widget (index);
34. M_dragindex = index;
36. QPIXMAP pix;
38. //pix = Qpixmap::grabwidget (m_pdragwidget);
40. PIX = Qpixmap::grabwindow (this->winid ());
42. if (Pix.isnull ())
44. {
46. int i;
48. }
50. Qmimedata *mimedata = new Qmimedata;
52. //mimedata->settext ("drag tab");
54. Qdrag *drag = new Qdrag (this);
56. Drag->setmimedata (Mimedata);
58. Drag->setpixmap (pix.scaled (Qsize (200,200))); //Here is mainly to think about QQ, you can drag the process to display the picture is dragged window. But the effect is not very good.
60. Drag->exec ();
62. }
66. void Mytabwidget::enddrag ()
68. {
70. Mytabwidget *pwidget = new Mytabwidget (NULL);
72. if (m_pdragwidget)
74. {

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1. //Create a separate window
2. RemoveTab (M_dragindex);
3. Pwidget->addtab (M_pdragwidget,m_dragtablabel);
4. Pwidget->show ();
5. }

http://blog.csdn.net/hai200501019/article/details/8987379

Qtabwidget Implement similar QQ chat window (drag to detach a new window)