我正在编写一个脚本，该脚本在底部有一个滚动导航菜单，由旋转编码器导航。一次应该只显示 3 个图标，中心图标始终较大，并且当用户到达列表末尾时，它应该顺利地从开头继续返回。这可以正常工作，直到我到达列表的末尾，但随后它会打破列表中最后一个和第一个成员的模式。
IE，应该是这样的：
0 [1] 2
1 [2] 3
2 [3] 4
3 [4] 5
4 [5] 0
5 [0] 1
但我得到的实际模式是：
0 [1] 2
1 [2] 3
2 [3] 4
3 [4] 5
0 4 [5]
[0] 1 5
这是完整代码
import sys
from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QPushButton, QGridLayout
from PyQt5.QtGui import QFont
from PyQt5.QtCore import Qt, QTimer
import board
import busio
from adafruit_seesaw.seesaw import Seesaw
from adafruit_seesaw.rotaryio import IncrementalEncoder
# Rotary Encoder setup
i2c = busio.I2C(board.SCL, board.SDA)
ss = Seesaw(i2c, addr=0x49)
encoder = IncrementalEncoder(ss)
last_position = encoder.position
class RotaryInterface(QWidget):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
self.setWindowState(Qt.WindowFullScreen)
self.setStyleSheet("background-color: blue;")
self.font_small = QFont('Symbola', 30)
self.font_large = QFont('Symbola', 50)
self.symbols_with_effects = [
("\U0001F31F", "Glowing Star"),
("\U0001F3A8", "Artist Palette"),
("\U0001F680", "Rocket"),
("\U0001F340", "Four Leaf Clover"),
("\U0001F308", "Rainbow"),
("\U0001F319", "Crescent Moon")
]
self.labels = [QLabel(sym[0], self) for sym in self.symbols_with_effects]
self.symbol_layout = QGridLayout()
self.symbol_layout.setSpacing(0)
self.setLayout(self.symbol_layout)
for i, label in enumerate(self.labels):
label.setFont(self.font_small)
label.setAlignment(Qt.AlignBottom | Qt.AlignHCenter)
self.symbol_layout.addWidget(label, 0, i)
self.selected = 1
self.visible_icons = self.calculateVisibleIcons()
self.updateDisplay()
self.timer = QTimer(self)
self.timer.timeout.connect(self.checkEncoder)
self.timer.start(100)
self.close_button = QPushButton(chr(0x274E), self)
self.close_button.setFont(QFont('Symbola', 50))
self.close_button.setStyleSheet("QPushButton { background-color: rgba(0, 0, 0, 0); color: red; border: 0px; }"
"QPushButton:hover, QPushButton:pressed, QPushButton:focus {"
"background-color: rgba(0, 0, 0, 0); color: red; border: 0px;}")
self.close_button.setFlat(True)
self.close_button.setGeometry(700, 0, 100, 100)
self.close_button.clicked.connect(self.close)
def calculateVisibleIcons(self):
num_icons = len(self.symbols_with_effects)
# When selected is the first icon
if self.selected == 0:
return [num_icons - 1, self.selected, self.selected + 1]
# When selected is the last icon
elif self.selected == num_icons - 1:
return [self.selected - 1, self.selected, 0]
# For all other cases
else:
return [self.selected - 1, self.selected, self.selected + 1]
def updateDisplay(self):
# Hide all labels initially
for label in self.labels:
label.hide()
# Show and set font for visible icons
for index in self.visible_icons:
label = self.labels[index]
label.show()
if index == self.selected:
label.setFont(self.font_large)
else:
label.setFont(self.font_small)
def checkEncoder(self):
global last_position
position = encoder.position
if position != last_position:
delta = position - last_position
self.selected = (self.selected + delta) % len(self.symbols_with_effects)
self.visible_icons = self.calculateVisibleIcons()
self.updateDisplay()
last_position = position
def keyPressEvent(self, event):
if event.key() == Qt.Key_Escape:
self.close()
if __name__ == '__main__':
app = QApplication(sys.argv)
ex = RotaryInterface()
ex.show()
sys.exit(app.exec_())
我尝试更新
calculateVisibleIcons
def calculateVisibleIcons(self):
num_icons = len(self.symbols_with_effects)
# When selected is the first icon
if self.selected == 0:
return [num_icons - 1, self.selected, self.selected + 1]
# When selected is the last icon
elif self.selected == num_icons - 1:
return [self.selected - 1, self.selected, 0]
# For all other cases
else:
return [self.selected - 1, self.selected, self.selected + 1]
我似乎在这里犯了一个简单的逻辑错误，但我似乎无法弄清楚。谢谢。
啊！刚刚想通了。解决方法是在环绕期间显式管理 qgridlayout 中 qlabel 小部件的位置，确保它们根据正确的顺序重新定位并刷新。
def updateDisplay(self):
# Hide all labels initially and remove them from the layout
for label in self.labels:
label.hide()
self.symbol_layout.removeWidget(label)
# Reposition and show the visible icons in the layout
for i, index in enumerate(self.visible_icons):
label = self.labels[index]
label.show()
if index == self.selected:
label.setFont(self.font_large)
else:
label.setFont(self.font_small)
# Update the position in the grid layout
self.symbol_layout.addWidget(label, 0, i)
您只是更改小部件的可见性，而不是它们的顺序。
将标签添加到布局时，它们按以下顺序排列：
[0] [1] [2] [3] [4] [5]
如果您随后设置可见标签 4、5 和 0，则小部件仍位于其位置：
[0] --- --- --- [4] [5]
隐藏或显示小部件的顺序完全无关。
为了“移动”标签的位置，您应该将其删除并再次添加到布局中。
请注意，在这些情况下，您应该始终使用专用布局，该布局不得与其他小部件共享。
QGridLayout 也未指示用于此类目的，并且水平框布局更合适，因为项目索引排序会在删除或插入时自动调整。
class RotaryInterface(QWidget):
...
def initUI(self):
...
self.main_layout = QVBoxLayout(self)
self.symbol_layout = QHBoxLayout()
self.main_layout.addLayout(self.symbol_layout)
...
def updateDisplay(self):
# Only hide not visible labels and remove them from the layout
for i, label in enumerate(self.labels):
if not i in self.visible_icons:
label.hide()
self.symbol_layout.removeWidget(label)
lastIndex = -1
for index in self.visible_icons:
label = self.labels[index]
if index == self.selected:
label.setFont(self.font_large)
else:
label.setFont(self.font_small)
if index < lastIndex:
self.symbol_layout.removeWidget(label)
self.symbol_layout.addWidget(label)
label.show()
lastIndex = index
这个概念是，如果“新”小部件的索引低于前一个，则应将其删除并添加到布局的“末尾”。