PyQt Single Instance

[csp]

Hi,

 

I have python script using PyQt ui based on SESI's recommended example. As is, I will have unlimited instances when I hit shelf tool. How is possible to keep a single instance open. Either deleting previous instance and opening a fresh one or blocking a new instance if there is already one open.

 

My last question is how to quit script/ui once using a button. Let's say "Open Hip", first command to open a new hip and then quit the tool.

 

cheers,

[Alexey Vanzhula]

import hou
from PySide import QtCore as qtc
from PySide import QtGui as qtg

#----------------------------------------------------------------------------------------

try:        app = qtg.QApplication(['houdini'])
except:     app = qtg.QApplication.instance()

event_loop = qtc.QEventLoop()

#----------------------------------------------------------------------------------------

def qt_callback():
    if not ctl.isVisible():
        try:    hou.ui.removeEventLoopCallback( qt_callback )
        except: pass
    event_loop.processEvents()
    app.sendPostedEvents(None, 0)

#----------------------------------------------------------------------------------------

ctl = None
def show( ctl_ ):
    global ctl
    ctl = ctl_
    ctl.show()
    hou.ui.addEventLoopCallback( qt_callback )

#----------------------------------------------------------------------------------------
#----------------------------------------------------------------------------------------

button_widget = qtg.QPushButton('Hello World !!!')
button_widget.clicked.connect( button_widget.hide )
button_widget.setWindowFlags( qtc.Qt.FramelessWindowHint | qtc.Qt.WindowStaysOnTopHint )
show(button_widget)

1. This simple one-widget solution use one QApplication instance.

2. You can connect clicked button signal to hide widget. Hide widget with no parents leads to finish script

Edited July 11, 2014 by Alexey Vanzhula

[Alexey Vanzhula]

And this is example:

http://youtu.be/WEW95Yu_Ijs

Edited July 11, 2014 by Alexey Vanzhula

[csp]

Thanks for your replies Alexey. I have hard time to make your code work inside my script. Here is my working script.

I am bringing in the ui with loadUi. The hide function will not work, probably I am using it wrong. The Qt.WindowStaysOnTopHint is working in my mac but I am using PySide there. At work's linux I can't get it stay on top. And most important the single instance.

import hou, os
import pyqt_houdini
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4.uic import *

app = QApplication.instance()
if app is None:
        app = QApplication(['houdini'])
        
projectsDir = '/jobs'
pwd = os.path.dirname(__file__)


class StartShot(QWidget):
    def __init__(self, parent=None):
        super(StartShot, self).__init__(parent)

        # ui loader
        self.ui = loadUi(pwd+'/ui/open.ui', self)

        # get parameters
        self.filter = self.ui.findChild(QLineEdit, 'filter')
        self.project = self.ui.findChild(QComboBox, 'project')
        self.shot = self.ui.findChild(QComboBox, 'shot')
        self.hip = self.ui.findChild(QComboBox, 'hip')
        self.open = self.ui.findChild(QPushButton, 'load')
        
        # initial function
        self.getProject()
        
        # set connections
        self.filter.textChanged.connect(self.getProject)
        self.project.currentIndexChanged.connect(self.getShot)
        self.shot.currentIndexChanged.connect(self.getHip)
        self.open.clicked.connect(self.loadHip)
        
        self.ui.setWindowFlags(Qt.WindowStaysOnTopHint) #will not work in Linux
        self.ui.show()
        
    def getProject(self):
        #code
        
    def getShot(self):
        #code

    def getHip(self):
        #code

    def loadHip(self):
        project = str(self.project.currentText())
        shot = str(self.shot.currentText())
        job = os.path.join(projectsDir, project, shot)
        hip = job+'/hip/'+str(self.hip.currentText())
        if os.path.isfile(hip):
            hou.hipFile.load(hip)
            hou.hscript('setenv JOB = %s'%job)
            self.hide #will not work but no error

def runApp():
    dialog = StartShot()
    pyqt_houdini.exec_(app, dialog)

[Alexey Vanzhula]

1. I this case there is no difference between PySide and PyQt4.

2. For linux there is some situations where you need to setup your window manager for WindowStaysOnTopHint.

3. I never used uic and Designer for build ui -  just manually layouting controls. It is my firm position

4. This solution works well for me and my linux desktop. But you can also try this http://paulwinex.blogspot.com/2014/06/pyside-helper-for-houdini.html

Edited July 11, 2014 by Alexey Vanzhula

[csp]

So, if you had to edit my code to do what yours does... single instance, etc. How would you do that?

[Alexey Vanzhula]

There are many ways to do that.

So, give me open.ui file for testing it

Edited July 11, 2014 by Alexey Vanzhula

[csp]

Alexey, please check your messages.

[stevegh]

Can you share what portions of your ui file were misbehaving?

[csp]

hello stevegh, there is nothing wrong with the script as is. I just wanted to have some functionalities, as single instance and close window on button clicked, which I can live without.