Continue to learn QT-QT (2) from the QT built-in dialog box)

Qt has rich built-in dialogs, such as color settings, font settings, and file selection. Let's take a look at the overall interface:
 

 
Next, let's take a look at the implementation code of the color selection dialog box:
 

 
1: qpalette palette = displaytextedit-> palette ();/* Obtain the palette in textedit */
 
 
2:
 
 
3:/* Open a color dialog box and obtain the selected color */
 
4:ConstQcolor & color =
 
 
5: qcolordialog: getcolor (palette. color (qpalette: base ),This);
 
 
6:If(Color. isvalid ()){
 
 
7: palette. setcolor (qpalette: Base, color );/* Set the color */
 
8: displaytextedit-> setpalette (palette );/* Apply it to qtextedit */
 
 
The effect is as follows:
 
 
 
 
 
Next let's take a look at the implementation of the font dialog box.Code:
 
 
1:BoolOK;/* The record font dialog box determines whether the button is pressed */
 
 
2:
 
3:/* Record the font selected in the font dialog box */
 
 
4:ConstQfont & font = qfontdialog: getfont (& OK,
 
 
5:This-> Displaytextedit-> font (),
 
 
6:This,
 
7: TR ("Font dialog box"));
 
 
8:If(OK ){
 
 
9:/* Apply the selected font to qtextedit */
 
 
10:This-> Displaytextedit-> setfont (font );
 
11 :}
 
 
The effect is as follows:
 
 
 
 
 
Finally, let's look at an interesting progress dialog box:
 
 
1:/* Create a progress dialog box and set its initial value to 0 and maximum value to 10000 */
 
 
2: qprogressdialog progress (TR ("Copying file..."),
 
 
3: TR ("Cancel"),
 
4: 0,
 
 
Five: 10000,
 
 
6:This);
 
 
7: progress. setwindowmodality (QT: windowmodal );
 
8: progress. setwindowtitle (TR ("Progress dialog box"));
 
 
9: progress. Show ();
 
 
10:For(IntI = 0; I <10001; I ++ ){
 
 
11: progress. setvalue (I );/* Set the SS Description */
 
12: qapp-> processevents ();
 
 
13:If(Progress. wascanceled ()){/* Click the cancel button */
 
 
14:Break;
 
 
15 :}
 
 
16 :}
 
:
 
 
 
 
 
These built-in dialogs can save us a lot of time.