所以我尝试使用自定义小部件构建一个简单的 PyQt 应用程序。然而,画家并没有画任何东西。如果我注释掉第 44-45 行(label = QLabel('Map');box.addWidget(label)
),我可以看到一个大的彩色矩形。但是,当我尝试在矩形上方添加标签时,矩形不再显示。
我认为我可能使用了错误的画家,但我不确定。
我是 PyQt 的新手,任何对我的编码风格或逻辑的评论也将受到赞赏。
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QPainter, QColor
from PyQt5.QtWidgets import (QMainWindow,
QWidget,
QFrame,
QDesktopWidget,
QGridLayout,
QLabel,
QTextEdit,
QSplitter,
QVBoxLayout,
QApplication)
class Simulator(QMainWindow):
def __init__(self):
super().__init__()
self.stdout = QTextEdit()
self.stderr = QTextEdit()
self.exec = QTextEdit()
self.frame = QFrame()
self.setCentralWidget(self.frame)
self.screen = QDesktopWidget().screenGeometry()
self.setGeometry(self.screen)
self.grid = QGridLayout()
self.frame.setLayout(self.grid)
self.map = SimulatedFieldMap()
# -- setting splitters
splitter_r = QSplitter(Qt.Vertical)
splitter_l = QSplitter(Qt.Vertical)
splitter_h = QSplitter(Qt.Horizontal)
splitter_h.addWidget(splitter_l)
splitter_h.addWidget(splitter_r)
# --------------
# -- top left --
frame = QFrame()
box = QVBoxLayout()
frame.setLayout(box)
splitter_l.addWidget(frame)
label = QLabel('Map')
box.addWidget(label)
box.addWidget(self.map)
# ------
# -- bottom left --
box = QVBoxLayout()
frame = QFrame()
frame.setLayout(box)
box.addWidget(QLabel('Exec'))
box.addWidget(self.exec)
splitter_l.addWidget(frame)
# -------
# -- top right --
box = QVBoxLayout()
frame = QFrame()
frame.setLayout(box)
splitter_r.addWidget(frame)
box.addWidget(QLabel('STDOUT'))
box.addWidget(self.stdout)
# -------
# -- bottom right --
box = QVBoxLayout()
frame = QFrame()
frame.setLayout(box)
splitter_r.addWidget(frame)
box.addWidget(QLabel('STDERR'))
box.addWidget(self.stderr)
# -------
self.grid.addWidget(splitter_h, 0, 0)
splitter_h.setSizes((self.screen.width() * 0.7, self.screen.width() * 0.3))
splitter_l.setSizes((self.screen.height() * 0.7, self.screen.height() * 0.3))
splitter_r.setSizes((self.screen.height() * 0.7, self.screen.height() * 0.3))
class SimulatedFieldMap(QWidget):
def __init__(self):
super().__init__()
def paintEvent(self, event):
qp = QPainter()
qp.begin(self)
self.paintMap(qp)
qp.end()
def paintMap(self, qp):
qp.setBrush(QColor(200, 162, 200)) # lilac
qp.setPen(QColor(200, 162, 200))
geo = self.geometry()
qp.drawRect(geo)
if __name__ == '__main__':
app = QApplication([])
app.setStyle('Fusion')
sim = Simulator()
sim.show()
status = app.exec_()
exit(status)
我在 macOS 10.13.5 上使用 Python3.7。
最佳答案
绘制小部件时,将使用内部坐标,但 geometry()
是相对于父级的坐标,因此您不应该使用它,而应该使用 rect()
.
from PyQt5 import QtCore, QtGui, QtWidgets
class Simulator(QtWidgets.QMainWindow):
def __init__(self):
super().__init__()
self.stdout = QtWidgets.QTextEdit()
self.stderr = QtWidgets.QTextEdit()
self.exec = QtWidgets.QTextEdit()
self.frame = QtWidgets.QFrame()
self.setCentralWidget(self.frame)
self.grid = QtWidgets.QGridLayout(self.frame)
self.map = SimulatedFieldMap()
# -- setting splitters
splitter_r = QtWidgets.QSplitter(QtCore.Qt.Vertical)
splitter_l = QtWidgets.QSplitter(QtCore.Qt.Vertical)
splitter_h = QtWidgets.QSplitter(QtCore.Qt.Horizontal)
splitter_h.addWidget(splitter_l)
splitter_h.addWidget(splitter_r)
# --------------
# -- top left --
frame = QtWidgets.QFrame()
box = QtWidgets.QVBoxLayout(frame)
splitter_l.addWidget(frame)
label = QtWidgets.QLabel('Map')
box.addWidget(label)
box.addWidget(self.map)
# ------
# -- bottom left --
frame = QtWidgets.QFrame()
box = QtWidgets.QVBoxLayout(frame)
box.addWidget(QtWidgets.QLabel('Exec'))
box.addWidget(self.exec)
splitter_l.addWidget(frame)
# -------
# -- top right --
frame = QtWidgets.QFrame()
box = QtWidgets.QVBoxLayout(frame)
splitter_r.addWidget(frame)
box.addWidget(QtWidgets.QLabel('STDOUT'))
box.addWidget(self.stdout)
# -------
# -- bottom right --
frame = QtWidgets.QFrame()
box = QtWidgets.QVBoxLayout(frame)
splitter_r.addWidget(frame)
box.addWidget(QtWidgets.QLabel('STDERR'))
box.addWidget(self.stderr)
# -------
screen = QtWidgets.QDesktopWidget().screenGeometry()
self.grid.addWidget(splitter_h, 0, 0)
splitter_h.setSizes((screen.width() * 0.7, screen.width() * 0.3))
splitter_l.setSizes((screen.height() * 0.7, screen.height() * 0.3))
splitter_r.setSizes((screen.height() * 0.7, screen.height() * 0.3))
class SimulatedFieldMap(QtWidgets.QWidget):
def __init__(self):
super().__init__()
def paintEvent(self, event):
qp = QtGui.QPainter(self)
self.paintMap(qp)
def paintMap(self, qp):
qp.setBrush(QtGui.QColor(200, 162, 200)) # lilac
qp.setPen(QtGui.QColor(200, 162, 200))
qp.drawRect(self.rect())
if __name__ == '__main__':
import sys
app = QtWidgets.QApplication(sys.argv)
app.setStyle('Fusion')
sim = Simulator()
sim.showMaximized()
sys.exit(app.exec_())
更新:如果您希望将其放置在某个位置,则不应将其放置在布局中,但标签必须是 map 的子级并使用 move()
建立相对于 map 左上角的位置。
# -- top left --
frame = QtWidgets.QFrame()
box = QtWidgets.QVBoxLayout(frame)
box.addWidget(self.map)
splitter_l.addWidget(frame)
label = QtWidgets.QLabel('Map', self.map)
label.move(0, 100)
# ------
更新:问题是由 QLabel 的垂直 sizePolicy 引起的,即 QSizePolicy::Preferred
使其展开,一个简单的解决方案是将其更改为 QSizePolicy::Maximum
,所以正确的高度是根据字体计算的。
# -- top left --
frame = QtWidgets.QFrame()
box = QtWidgets.QVBoxLayout(frame)
splitter_l.addWidget(frame)
label = QtWidgets.QLabel('Map')
sp = label.sizePolicy()
sp.setVerticalPolicy(QtWidgets.QSizePolicy.Maximum)
label.setSizePolicy(sp)
box.addWidget(label)
box.addWidget(self.map)
# ------
关于python - 为什么带有自定义绘画的小部件不可见?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/53052517/