C++ GUI Programming with Qt 3. Rozália Szabó Nacsa Eötvös Loránd University, Budapest

Transcription

1 C++ GUI Programming with Qt 3 Rozália Szabó Nacsa Eötvös Loránd University, Budapest nacsa@inf.elte.hu 1

2 The Task QMainWindow (RichEdit) QTextEdit(textEdit) 2

3 The ui.h extension approach Qt designer Application specific functions are aregiven giveninin the therichedit.ui.h implementation file. file. richedit.ui richedit.ui richedit.ui.h richedit.ui.h UIC richedit.h richedit.h Reads and writes Reading Generates #includes Tool Generated source file Revision controlled source file richedit.cpp richedit.cpp main.cpp main.cpp 3

4 Creating a Project File 1 File/New

5 Creating a Main Window 1 File/New 2 3 5

6 Choose available menus and toolbars page 6

7 Setup Toolbar page 7

8 RichEdit: Properties 8

9 Save the project File/Save Accept the name: richedit 9

10 Adding main program to the project File/New 10

11 main.cpp #include #include <qapplication.h> <qapplication.h> #include #include"richedit.h" main.cpp int int main( main( int intargc, char char ** ** argv argv )) {{ QApplication QApplicationa( a( argc, argc, argv argv ); ); RichEdit RichEditw; w; w.show(); w.show(); a.connect( a.connect( &a, &a, SIGNAL( SIGNAL( lastwindowclosed() lastwindowclosed() ), ),&a, SLOT( SLOT( quit() quit() )));); return returna.exec(); }} The generated main.cpp program 11

12 Compile & Run No slots, but it is still in the menu (qmake project) qmake o o Makefile richedit.pro nmake richedit 12

13 Preview Ctrl+T 13

14 Action Editor in Action 14

15 Creating new Actions: Italic, Bold, Underlined Fonts Right Click & A new actioon appears in he Action Editor. Properties are given in the next slide. 15

16 Properties of Bold Action 16

17 Adding Pictures to the Project 17

18 Properties of Font Actions boldaction italicaction underlineaction 18

19 Creating Action Group: Alignment 19

20 alignactiongroup s properties 20

21 Creating Actions within a Group Select the alignactiongroup, then Right Click &

22 Properties of Align Actions leftalignaction rightalignaction centeralignaction 22

23 Deleting unnecessary Actions 23

24 Creating a Toolbar RightClickattherightend of the toolbar. 24

25 New New Toolbar Drag Drag & Drop Drop Select the action you want to add to the toolbar, drag & drop & 25

26 Inserting separator into the toolbar 1.Right Click on ona toolbar button (!!!) (!!!) Insert Separator 26

27 Adding Font Actions to the Toolbar Drag Drag & Drop Drop 27

28 Creating a Font ComboBox on the Toolbar 2 ClickontheSeparator (!) (!) 1 Click on onthe thecombobox 28

29 2 ClickontheComboBox (!) (!) 1 Click on onthe thespinbox 29

30 SpinBox s and ComboBox s Properties 30

31 Adding Menus to the Project 1 Rightclickonthemenubar 2 31

32 A new Menu in the Project 32

33 F&ormat Renaming menu text Press PressF2 F2 to toedit editthe thetext. text. 33

34 Insering alignactiongroup into Format Menu Drag Drag & Drag Drag & Drop Drop 1. Select alignactiongroup in Action Editor 2. Keep press the left mouse button 3. Keep pressing find the Format menu 4. Keep pressing move down and find the position of the submenu. (The red line shows the position.) 34

35 Adding Separator to the Menu Drag Drag & Drop Drop 35

36 Drag Drag & Drop Drop 36

37 Adding the Main Widget QTextEdit (textedit) 37

38 textedit s properties 38

39 2 Lay Out the Form 3 1 ClickontheForm. (No selected widgets!) 39

40 Creating Connections to ChangeFont Attributes Sender: boldaction Signal: toggled(bool) Receiver: textedit Slot: Slot: setbold(bool) Sender: italicaction Signal: toggled(bool) Receiver: textedit Slot: Slot: setitalic(bool) Sender: underlineaction Signal: toggled(bool) Receiver: textedit Slot: Slot: setunderline(bool) 40

41 Using Documentation: QAction 41

42 Using Documentation: QTextEdit 42

43 Preview These functions can canbe be activated in indifferent way. way. 43

44 Qt designer richedit.ui richedit.ui richedit.ui.h richedit.ui.h UIC richedit.h richedit.h richedit.cpp richedit.cpp main.cpp main.cpp 44

45 Defining constructor : init() void voidrichedit::init() { textedit->setfocus(); } richedit.ui.h 45

46 New Slot: changealignment(qaction*) Function: changealignment(qaction*) Return type: type: void void Specifier: virtual Access: public Type: slot slot 46

47 New Connection Sender: alignactiongroup Signal: selected(qaction*) Receiver: RichEdit Slot: Slot: changealignment(qaction*) 47

48 RichEdit::changeAlignment(QAction *action) void voidrichedit::changealignment( QAction * alignaction) { if if (alignaction == == leftalignaction) textedit->setalignment(qt::alignleft); else elseif if (alignaction == == rightalignaction) textedit->setalignment(qt::alignright); else elseif if (alignaction == == centeralignaction) textedit->setalignment(qt::aligncenter); } richedit.ui.h 48

49 New Function: saveandcontinue(const QString & action) Function: saveandcontinue(const QString & action) Return type: type: int int Specifier: virtual Access: protected Type: function 49

50 RichEdit::saveAndContinue(const QString & action) int intrichedit::saveandcontinue( const const QString QString & action action )){{ int intcontinueaction = 1; 1; if if (( textedit->ismodified() )){{ switch( switch( QMessageBox::information( this, this, "Rich "Rich Edit", Edit", "The "The document document contains contains unsaved unsaved changes.\n" changes.\n" "Do "Do you you want want to to save save the the changes?", changes?", "&Save", "&Save","&Don't "&Don't Save", Save", "&Cancel "&Cancel" " + action, action, 0, 0, // // Enter Enter == == button button ) )){ {//// Escape Escape == == button button 22 case case 0: 0: // // Save; Save; continue continue filesave(); filesave(); break; break; case case 1: 1: // // Do Do not not save; save; continue continue break; break; case case 2: 2: // // Cancel Cancel continueaction continueaction = 0; 0; break; break; }} }} return return continueaction; continueaction; }} richedit.ui.h Includes (in (inimplementation): <qmessagebox.h> 50

51 New Function: saveandcontinue(const QString & action) Function: saveandcontinue(const QString & action) Return type: type: int int Specifier: virtual Access: protected Type: function 51

52 RichEdit::saveAndContinue(const QString & action) int intrichedit::saveandcontinue( const const QString QString & action action )){{ int intcontinueaction = 1; 1; if if (( textedit->ismodified() )){{ switch( switch( QMessageBox::information( this, this, "Rich "Rich Edit", Edit", "The "The document document contains contains unsaved unsaved changes.\n" changes.\n" "Do "Do you you want want to to save save the the changes?", changes?", "&Save", "&Save","&Don't "&Don't Save", Save", "&Cancel "&Cancel" " + action, action, 0, 0, // // Enter Enter == == button button ) )){ {//// Escape Escape == == button button 22 case case 0: 0: // // Save; Save; continue continue filesave(); filesave(); break; break; case case 1: 1: // // Do Do not not save; save; continue continue break; break; case case 2: 2: // // Cancel Cancel continueaction continueaction = 0; 0; break; break; }} }} return return continueaction; continueaction; }} richedit.ui.h Includes (in (inimplementation): <qmessagebox.h> 52

53 Compile & Run 53

54 54