SAW4

--[[ Gtk.Revealer widget hiding animation with Lua & lgi

intro: revealer use to hide and show widgets with different transitions
demo: create a toolbar, hide/show by using a button(named:testbutton)

--]]

-- Import the module that you need 
local lgi = require ('lgi')
local Gtk = lgi.Gtk

SAW4

How to use metaclass to implement Singleton in Python

First, you need to know that instance of metaclass is class,
just like : an instance of class is object, they have similar idea

Then you need to change the rule of metaclass of your class, to let it only allow create the instance once only.
If the class instance is not None (instance is existed), then return the instance, else create new instance of class.

One more important thing, metaclass is type
class is the instance of type (metaclass)
the origin of class is type (I may say that)

SAW4

# Create a new Qmenu
self.sqlcfg_menu = QtWidgets.QMenu(self) 

# First item here, index 0
icon = QIcon(os.path.join(self.path, "image/File.png"))
self.sqlcfg_menu.addAction(icon, 'my.cnf', lambda: self.sqlConfMan('my.cnf'))

# Second item, index 1
self.sqlcfg_menu.addSeparator()

SAW4

from functools import wraps
...
...
class MainInterface(QMainWindow):
...
...
# Reusble Exception checking funciton (For file manager, open file)
  def fm_handle_stripe(f):
      def wrapper(*args, **kwargs):
          try:

SAW4

void MainInterface::ShowPathToCurr() {
	TreeNodeButton* NodeButton = qobject_cast<TreeNodeButton*>(sender());
	QPropertyAnimation *a;
	int i = 1;
	for (Node* curr = NodeButton->get_localref(); !curr->activated; curr=curr->prev,++i){
		QGraphicsOpacityEffect *eff = new QGraphicsOpacityEffect(this);
		a= new QPropertyAnimation(eff, "opacity");
		curr->Widgetptr->setGraphicsEffect(eff);
		curr->Widgetptr->setGraphicsEffect(eff);
		a->setDuration(1000+i*500);