1. Custom Widgets & Events

2. Top Level Windows
Dialog
Simple window
Window
Has status bar, menu

3. Subclasses QT GUIs generally subclass an existing class Add features
FindDialog extends QDialog
Add features
Controls this dialog has
New behaviors (signals/slots)
Connections between behaviors

4. FindDialog.h Extends Qdialog Q_OBJECT
Must add for slots and signals to get handled correctly
Constructor takes optional pointer to parent widget

5. FindDialog.h signals: public/private slots:
Special section identifying signal functions
public/private slots:
Section identifying slot functions

6. FindDialog.h private members:
Components we may need to refer to throughout lifetime of app

7. FindDialog.cpp Constructor Body…
If parent widget we live in, pass that off to Qdialog part to handle:

8. The Main
Main just creates instance of our GUI, starts app:

9. FindDialog.cpp Constructor Body… setup components Optional stuff:
tr( ) – allows for easier translation
& - Defines alt-shortcut based on next char
setBudy – makes hotkey for label select lineEdit

10. FindDialog.cpp Constructor Body… setup components Optional stuff:
setDefualt( ) – makes this button be one that responds to Enter key on form
setEnabled(false) – make widget unusable

11. The Layout
hBox for main
vBox for left
hBox for topLeft
vBox for right

12. FindDialog.cpp Constructor Body… layout stuff
Don't need layouts to be members
setFixedHeight
Prevent me from messing it up
sizeHint()
Get preferred size

13. FindDialog.cpp Constructor Body… behavior setup
lineEdit textChanged calls our dialog's enableFindButton
findButton clicked calls findClicked function of our dialog
Close button closes the window
Params of slot and signal should usually match though extra ones in signal may be OK

14. FindDialog.cpp Destructor
None needed!!! Qwidget destructor (part of us) deletes any contained widgets when we are deleted
Would only need one for non-widget related heap allocations

15. FindDialog.cpp enableFindButton:
Slot function… must take const Qstring& because that is what lineEdit.textChanged sends:

16. FindDialog.cpp Emit function() : send with this name findClicked:
Emits appropriate signal
Nothing listening, but a text editor window could…

17. QStrings QString mostly like normal string
Doesn't overload << operator though
Turn QString to std::string using .toStdString()

18. Debugging Hints For console output make sure .pro has this line:
Then check application output:

19. Debugging Hints For console output make sure .pro has this line:
Or check Run in Terminal under Project settings: