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I am trying to create a UI that will act as a hub to launch all the other tools that have been created. The problem is that if i try to launch the UI from the toolshub UI, it won't let me because the event loop is already running. I know that I cannot do this APP = QtGui.QApplication(sys.argv) and APP.exec_() when launching the new window because the event loop is already running when I did that for the toolshub UI. But I can't figure out how to do it another way.

Here is an example code for one of the tools, works launching on its own.

global APP
APP = None

class toolwindow(QtGui.QDialog):

    def __init__(self, parent=None):
        init_app()
        super(toolwindow, self).__init__(parent)
        self.setWindowTitle('tool')
        self.setMinimumSize(QtCore.QSize(500, 600))
        self.setMaximumSize(QtCore.QSize(500, 600))
        self.create_ui()

    def create_ui(self):
        code goes here

    def closeEvent(self, event):
        QtGui.QDialog.closeEvent(self, event)
        return

def init_app():
    global APP
    APP = QtGui.QApplication.instance()
    if not APP:
        APP = QtGui.QApplication(sys.argv)
    return

def start_ui():
    win= toolwindow()
    win.show()
    APP.exec_()

if __name__ == '__main__':
    start_ui()
global APP
APP = None

Now here is the code for the toolshub ui. These are both separate scripts. In toolshub i am importing the tool above.

import tool
LOGGER = logging.getLogger(__name__)
global APP
APP = None

class toolsHub(QtGui.QDialog):

    def __init__(self, parent=None):
        init_app()
        super(toolsHub, self).__init__(parent)
        self.setWindowTitle('Tools Launcher')
        self.setSizeGripEnabled(False)
        self.setMinimumSize(QtCore.QSize(300, 200))
        self.setMaximumSize(QtCore.QSize(300, 200))
        self.create_layouts()

    def create_layouts(self):
        master_layout = QtGui.QVBoxLayout()
        self.setLayout(master_layout)
        self.input_widgets()
        grid_layout = QtGui.QGridLayout()
        grid_layout.addWidget(self.env_creator, 0, 0)
        grid_layout.addWidget(self.p4dl, 1, 0)
        master_layout.addLayout(grid_layout)

    def input_widgets(self):
        self.tool_button= QtGui.QPushButton('launch tool')
        self.tool_button.clicked.connect(self.launch_tool)

    def launch_tool(self):
        tool.start_ui()

    def closeEvent(self, event):
        QtGui.QDialog.closeEvent(self, event)
        return


def init_app():
    global APP
    APP = QtGui.QApplication.instance()
    if not APP:
        APP = QtGui.QApplication(sys.argv)
    return

def start_ui():
    toolui = toolsHub()
    toolui.show()
    APP.exec_()

if __name__ == '__main__':
    start_ui()

So how do write and structure these so that I can open the tool UI from the toolshub UI? I am guessing the code i have to change is the tool UI, I know i have to take out APP = QtGui.QApplication(sys.argv) and APP.exec_(), but not sure what to do to launch it.

Thanks

4

1 回答 1

0

应该只有一个 QApplication 实例，并且应该在创建任何小部件之前创建它，因此无需在每个模块中实例化它。

为了使 QDialog 正确显示，您必须执行其exec_()

工具.py：

[...]
def start_ui():
    win= toolwindow()
    win.exec_()

完整代码：

工具.py

from PySide import QtGui, QtCore

APP = None

class toolwindow(QtGui.QDialog):

    def __init__(self, parent=None):
        init_app()
        super(toolwindow, self).__init__(parent)
        self.setWindowTitle('tool')
        self.setMinimumSize(QtCore.QSize(500, 600))
        self.setMaximumSize(QtCore.QSize(500, 600))
        self.create_ui()

    def create_ui(self):
        pass
    def closeEvent(self, event):
        QtGui.QDialog.closeEvent(self, event)
        return

def init_app():
    global APP
    APP = QtGui.QApplication.instance()
    if not APP:
        APP = QtGui.QApplication(sys.argv)
    return

def start_ui():
    win= toolwindow()
    win.exec_()

if __name__ == '__main__':
    start_ui()

主文件

from PySide import QtGui, QtCore
import tool
import logging
import sys

LOGGER = logging.getLogger(__name__)
APP = None

class toolsHub(QtGui.QDialog):

    def __init__(self, parent=None):
        init_app()
        super(toolsHub, self).__init__(parent)
        self.setWindowTitle('Tools Launcher')
        self.setSizeGripEnabled(False)
        self.setMinimumSize(QtCore.QSize(300, 200))
        self.setMaximumSize(QtCore.QSize(300, 200))
        self.create_layouts()

    def create_layouts(self):
        master_layout = QtGui.QVBoxLayout()
        self.setLayout(master_layout)
        self.input_widgets()
        grid_layout = QtGui.QGridLayout()
        grid_layout.addWidget(QtGui.QPushButton(), 0, 0)
        grid_layout.addWidget(QtGui.QPushButton(), 1, 0)
        master_layout.addLayout(grid_layout)

    def input_widgets(self):
        self.tool_button= QtGui.QPushButton('launch tool')
        self.tool_button.clicked.connect(self.launch_tool)
        self.layout().addWidget(self.tool_button)

    def launch_tool(self):
        tool.start_ui()

    def closeEvent(self, event):
        QtGui.QDialog.closeEvent(self, event)


def init_app():
    global APP
    APP = QtGui.QApplication.instance()
    if not APP:
        APP = QtGui.QApplication(sys.argv)
    return

def start_ui():
    toolui = toolsHub()
    toolui.show()
    APP.exec_()

if __name__ == '__main__':
    start_ui()
于 2017-07-06T20:01:31.483 回答