PyQT - 定位和显示自定义小部件

Question

我正在尝试使用PyQT来定位和显示自定义小部件。到目前为止，我有一个小部件和我的窗口。我已经成功地通过布局显示了小部件，但是我想在show()之前使用.move(x,y,)来定位我的小部件。到目前为止，我的代码如下：

import sys, random
from PyQt4 import QtGui, QtCore

# Robot Widget
class RobotLink(QtGui.QWidget):
    def __init__(self, parent, x, y, width, height, fill):
        super(RobotLink, self).__init__(parent)
        self._x        = x
        self._y        = y
        self._width    = width
        self._height   = height
        self._fill     = fill
        self._rotation = 0

    def paintEvent(self, e):
        painter = QtGui.QPainter()
        painter.begin(self)
        self.drawLink(painter)
        painter.end()

    def drawLink(self, painter):
        painter.setPen(QtGui.QColor(0, 0, 0))
        painter.setBrush(self._fill)
        painter.drawEllipse(self._x, self._y, self._width, self._height)

# Window
class Window(QtGui.QWidget):
    # Default Constructor, sets up the window GUI
    def __init__(self):
        super(Window, self).__init__()
        self.initUI()

    def initUI(self):
        self._link1 = RobotLink(self, 225, 400, 30, 150, QtCore.Qt.DiagCrossPattern)
        self._link2 = RobotLink(self, 0, 320, 30, 100, QtCore.Qt.Dense5Pattern)
        self._link3 = RobotLink(self, 225, 260, 30, 75, QtCore.Qt.Dense2Pattern)

        self._link1.move(0, 0)
        self._link1.show()

        self.setGeometry(300, 300, 800, 600)
        self.setWindowTitle("CSCE 452 - PaintBot")


    def paintEvent(self, e):
        super(Window, self).paintEvent(e)
        painter = QtGui.QPainter()
        painter.begin(self)
        self.drawBoundingBoxes(painter)
        painter.end()

    # Draws the boxes that define the robots workspace and
    # the control panel
    def drawBoundingBoxes(self, painter):
        color = QtGui.QColor(0, 0, 0)
        color.setNamedColor("#cccccc")
        painter.setPen(color)

        # Draw the robot workspace
        painter.setBrush(QtGui.QColor(255, 255, 255))
        painter.drawRect(10, 10, 500, 578)

        # Draw the control panel workspace
        painter.setBrush(QtGui.QColor(150, 150, 150))
        painter.drawRect(520, 10, 270, 578)

        # Draws the slider 'base'
        painter.setPen(QtGui.QColor(0, 0, 0))
        painter.drawLine(100, 570, 400, 570)

    def changeValue(self, value):
        self.wid.emit(QtCore.SIGNAL("updateRobot(int)"), value)
        self.wid.repaint()

# Setup the Window, and the Robot
app = QtGui.QApplication(sys.argv)
win = Window()
win.show()
app.exec_()

有什么办法可以在没有布局的情况下附加我的小部件，将其定位并在我的窗口内显示吗？

- Julio

Answer 1

我注意到你代码中的几个问题：

1. 你不需要为自定义小部件定义存储 x、y、width 和 height。只需在构造函数中传递坐标调用setGeometry即可。小部件已经提供了getGeometry、getHeight、getWidth等方法，你可以使用它们来操纵和绘制你的组件。

2. 当你在子小部件drawLink方法中调用drawEllipse时，你将x和y坐标作为矩形��点传递给该函数。据我所知，你应该将0, 0放在那里，因为这些坐标应该是相对于小部件而不是窗口的。

我对你的代码进行了一些更改，请看看是否有效。

import sys, random
from PyQt4 import QtGui, QtCore

# Robot Widget
class RobotLink(QtGui.QWidget):
    def __init__(self, parent, x, y, width, height, fill):
        super(RobotLink, self).__init__(parent)
        self._fill     = fill
        self._rotation = 0
        self.setGeometry(x, y, width, height)

    def paintEvent(self, e):
        painter = QtGui.QPainter()
        painter.begin(self)
        self.drawLink(painter)
        painter.end()

    def drawLink(self, painter):
        painter.setPen(QtGui.QColor(0, 0, 0))
        painter.setBrush(self._fill)
        painter.drawEllipse(0, 0, self.width(), self.height())

# Window
class Window(QtGui.QWidget):
    # Default Constructor, sets up the window GUI
    def __init__(self):
        super(Window, self).__init__()
        self.initUI()

    def initUI(self):
        self._link1 = RobotLink(self, 10, 10, 100, 50, QtCore.Qt.DiagCrossPattern)
        self._link2 = RobotLink(self, 100, 100, 50, 100, QtCore.Qt.Dense5Pattern)
        self._link3 = RobotLink(self, 150, 150, 50, 50, QtCore.Qt.Dense2Pattern)

        self.setGeometry(300, 300, 800, 600)
        self.setWindowTitle("CSCE 452 - PaintBot")

    def paintEvent(self, e):
        super(Window, self).paintEvent(e)
        painter = QtGui.QPainter()
        painter.begin(self)
        self.drawBoundingBoxes(painter)
        painter.end()

    # Draws the boxes that define the robots workspace and
    # the control panel
    def drawBoundingBoxes(self, painter):
        color = QtGui.QColor(0, 0, 0)
        color.setNamedColor("#cccccc")
        painter.setPen(color)

        # Draw the robot workspace
        painter.setBrush(QtGui.QColor(255, 255, 255))
        painter.drawRect(10, 10, 500, 578)

        # Draw the control panel workspace
        painter.setBrush(QtGui.QColor(150, 150, 150))
        painter.drawRect(520, 10, 270, 578)

        # Draws the slider 'base'
        painter.setPen(QtGui.QColor(0, 0, 0))
        painter.drawLine(100, 570, 400, 570)

    def changeValue(self, value):
        self.wid.emit(QtCore.SIGNAL("updateRobot(int)"), value)
        self.wid.repaint()

# Setup the Window, and the Robot
app = QtGui.QApplication(sys.argv)
win = Window()
win.show()
app.exec_()

希望这可以帮到您，敬礼。

- serge_gubenko