QT5 Basic Knowledge

Qwidget W
Qlineedit edit;

Edit.show ();        If this is not the case, the edit box will be displayed in the upper-left corner of the parent window
Edit.setparent (&W); With W as the parent window and displayed on top
W.show ();
Qconnect (&button,signal (clicked ()), &w,slot (Close ())); Click the button to close the W window. W is the object, &w is the window

The exclusive use of Qlineedit

Qlineedit edit;
Edit.settext ("display text"); Display text above the edit box
Edit.setechomode (qlineedit::p assword);  The password entered automatically turns into a circular pattern
Edit.setechomode (qlineedit::p asswordechoonedit); The password entered becomes a circular pattern after losing focus

Account matching mode (enter a number to display the entire account)

Qcompleter Completer (stringlist () << "598265430" << "1710514175");
Completer.setfiltermode (Qt::matchcontains); As long as the content that is contained can match
Edit.setcompleter (&completer);        Match all the strings above the Completer on the edit box, only with the first character as the Datum

Set Control position

Edit.setgeometry (30,30,100,30);   X, y, long, tall,   not very good.

Qhboxlayout layout;                QH  for transverse qv for portrait

Layout.addstretch (1);      Add Spring fixed position

Layout.addwidget (&button);
Layout.addspacing (+);        50 pixels separated from the middle

Layout.addwidget (&edit);

Layout.addstretch (1);      Add Spring fixed position

W.setlayout (&layout);

Layout can help you fix the parent-child relationship, you can omit the above setparent.

Qgridlayout class  (Lattice Class)

Qgridlayout layout;

Layout.setcolumnstretch (3,1);    The spring of the column

Layout.setrowstretch (3,1);       The spring of the line

Layout.setcolumnstretch (0,1);

Layout.setrowumnstretch (0,1);

Layout.addwidget (&button,1,1);

Layout.addwidget (&edit,1,2);

Layout.addwidget (New Qpushbutton ("a"), 2, 1);

Layout.addwidget (New Qpushbutton ("B"), 2,2);

Layout.addwidget (New Qpushbutton ("Merger"), 3,1,1,2);  The following two parameters are combined with 1 rows and 2 columns

QT5 Basic Knowledge