mouse movement as arrows up/down/left/right

[dancaer69]

I'm trying to implement a mouse movement to a Frame to simulate keyboard direction keys. I some relative info and I tried the following:

class MainWindow(QMainWindow, Ui_MainWindow):

    def __init__(self, parent=None):
        super(MainWindow,self).__init__(parent)

        self.old_x = QCursor.pos().x()
        self.old_y = QCursor.pos().y()
        self.setupUi(self)
        self.frame.setMouseTracking(True)
        self.frame.installEventFilter(self)

        ....


        def eventFilter(self, source, event):
        if event.type() == QtCore.QEvent.MouseMove:
            #if event.buttons() == QtCore.Qt.NoButton:
            #    print("Simple mouse motion")
            if event.buttons() == QtCore.Qt.LeftButton:
                print("Left click drag")
                new_x = event.x()
                new_y = event.y()
                if new_x > self.old_x:
                    print("direction : right")
                    self.matrix, done = logic.right(self.matrix)
                    if done:
                        self.stateCheck()
                elif new_x < self.old_x:

                    print("direction : left")
                    self.matrix, done = logic.left(self.matrix)
                    if done:
                        self.stateCheck()
                elif new_y > self.old_y :
                    print("direction : down")
                elif new_y < self.old_y:
                    print("direction : up")
                self.old_x = new_x
                self.old_y=new_y
        return super(QFrame, self.frame).eventFilter(source, event)

This doesn't work as expected, and the movement changes directions most of the times, probably because when press the mouse button there is a very little movement to a different direction.
What I want to achive, is the functionality of keyboard direction keys. Can be done with the above approach?

[JonB]

@dancaer69
Not enough information how often/how much your things do/do not move.

At a guess, you might want to build some "tolerance" in. I might move right a lot, but perhaps have a tiny bit of left at, say, the end. You may have to look for how much the movement is, and ignore small moves. You might also want a timer-delay, so that multiple movements are combined. Again, depends on more information as to what is/is not working right.

[dancaer69]

Thanks, you had right. Needed to do something like that, but I didn't know how to do it. I tried QGestures which was my first choise, but I didn't find any information for pyqt and I didn't manage to make it work either. Finally I found moosegestrures library which does more that I want, but again no much info about that. It has some pygame examples though, and with those I managed to do what I wanted(probably not with an elegant way).
So here is how I did it:

class MainWindow(QMainWindow, Ui_MainWindow):

    def __init__(self, parent=None):
        super(MainWindow,self).__init__(parent)

        self.old_x = QCursor.pos().x()
        self.old_y = QCursor.pos().y()
        self.setupUi(self)
        self.frame.setMouseTracking(True)
        self.frame.installEventFilter(self)
        self.points[]
....


        def eventFilter(self, source, event):
        if event.type() == QtCore.QEvent.MouseMove:
            #if event.buttons() == QtCore.Qt.NoButton:
            #    print("Simple mouse motion")
            if event.buttons() == QtCore.Qt.LeftButton:
                if len(self.points) > 2:
                    startx, starty = self.points[0][0], self.points[0][1]
                    for i in range(len(self.points)):
                        self.points[i] = (self.points[i][0] - startx, self.points[i][1] - starty)
            self.points.append((event.localPos().x(), event.localPos().y()))
            print(self.points)
            #self.points = []
        elif event.type() == QtCore.QEvent.MouseButtonRelease:
            if event.button() == QtCore.Qt.LeftButton:
                print("Released!")
                self.mouseDown = False
                strokes = moosegesture.getGesture(self.points)
                strokeText=str(strokes[-1])
                #print(strokeText)
            if strokeText == "R":
                self.matrix, done = logic.right(self.matrix)
                if done:
                    self.stateCheck()
            if strokeText == "L":
                self.matrix, done = logic.left(self.matrix)
                if done:
                    self.stateCheck()
            if strokeText == "U":
                self.matrix, done = logic.up(self.matrix)
                if done:
                    self.stateCheck()
            if strokeText == "D":
                self.matrix, done = logic.down(self.matrix)
                if done:
                    self.stateCheck()
        return self.frame.eventFilter(source, event)