脚本之家，脚本语言编程技术及教程分享平台！
分类导航

Python|VBS|Ruby|Lua|perl|VBA|Golang|PowerShell|Erlang|autoit|Dos|bat|

服务器之家 - 脚本之家 - Python - python3+PyQt5实现自定义分数滑块部件

python3+PyQt5实现自定义分数滑块部件

2021-02-05 00:28basisworker Python

这篇文章主要为大家详细介绍了python3+PyQt5实现自定义分数滑块部件，具有一定的参考价值，感兴趣的小伙伴们可以参考一下

本文通过Python3+PyQt5实现自定义部件–分数滑块。它既能支持键盘也支持鼠标，使用物理（视口）坐标通过绘制方式显示。

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
#!/usr/bin/env python3
 
import platform
from PyQt5.QtCore import (QPointF, QRectF, QSize, Qt,pyqtSignal)
from PyQt5.QtWidgets import (QApplication, QDialog,QSizePolicy,
     QGridLayout, QLCDNumber, QLabel,
    QSpinBox, QWidget)
from PyQt5.QtGui import QColor,QFont,QPainter,QFontMetricsF,QPalette, QPolygonF
X11 = True
try:
  from PyQt5.QtGui import qt_x11_wait_for_window_manager
except ImportError:
  X11 = False
 
 
class FractionSlider(QWidget):
 
  XMARGIN = 12.0
  YMARGIN = 5.0
  WSTRING = "999"
  valueChanged = pyqtSignal(int,int)
 
  def __init__(self, numerator=0, denominator=10, parent=None):
    super(FractionSlider, self).__init__(parent)
    self.__numerator = numerator
    self.__denominator = denominator
    self.setFocusPolicy(Qt.WheelFocus)
    self.setSizePolicy(QSizePolicy(QSizePolicy.MinimumExpanding,
                    QSizePolicy.Fixed))
 
 
  def decimal(self):
    return self.__numerator / float(self.__denominator)
 
 
  def fraction(self):
    return self.__numerator, self.__denominator
 
 
  def sizeHint(self):
    return self.minimumSizeHint()
 
 
  def minimumSizeHint(self):
    font = QFont(self.font())
    font.setPointSize(font.pointSize() - 1)
    fm = QFontMetricsF(font)
    return QSize(fm.width(FractionSlider.WSTRING) *
           self.__denominator,
           (fm.height() * 4) + FractionSlider.YMARGIN)
 
 
  def setFraction(self, numerator, denominator=None):
    if denominator is not None:
      if 3 <= denominator <= 60:
        self.__denominator = denominator
      else:
        raise ValueError("denominator out of range")
    if 0 <= numerator <= self.__denominator:
      self.__numerator = numerator
    else:
      raise ValueError("numerator out of range")
    self.update()
    self.updateGeometry()
 
 
  def mousePressEvent(self, event):
    if event.button() == Qt.LeftButton:
      self.moveSlider(event.x())
      event.accept()
    else:
      QWidget.mousePressEvent(self, event)
 
 
  def mouseMoveEvent(self, event):
    self.moveSlider(event.x())
 
 
  def moveSlider(self, x):
    span = self.width() - (FractionSlider.XMARGIN * 2)
    offset = span - x + FractionSlider.XMARGIN
    numerator = int(round(self.__denominator *
            (1.0 - (offset / span))))
    numerator = max(0, min(numerator, self.__denominator))
    if numerator != self.__numerator:
      self.__numerator = numerator
      #self.emit(SIGNAL("valueChanged(int,int)"),
      #     self.__numerator, self.__denominator)
      self.valueChanged.emit(self.__numerator, self.__denominator)
      self.update()
 
 
  def keyPressEvent(self, event):
    change = 0
    if event.key() == Qt.Key_Home:
      change = -self.__denominator
    elif event.key() in (Qt.Key_Up, Qt.Key_Right):
      change = 1
    elif event.key() == Qt.Key_PageUp:
      change = (self.__denominator // 10) + 1
    elif event.key() in (Qt.Key_Down, Qt.Key_Left):
      change = -1
    elif event.key() == Qt.Key_PageDown:
      change = -((self.__denominator // 10) + 1)
    elif event.key() == Qt.Key_End:
      change = self.__denominator
    if change:
      numerator = self.__numerator
      numerator += change
      numerator = max(0, min(numerator, self.__denominator))
      if numerator != self.__numerator:
        self.__numerator = numerator
        #self.emit(SIGNAL("valueChanged(int,int)"),
        #     self.__numerator, self.__denominator)
        self.valueChanged.emit(self.__numerator, self.__denominator)
        self.update()
      event.accept()
    else:
      QWidget.keyPressEvent(self, event)
 
 
  def paintEvent(self, event=None):
    font = QFont(self.font())
    font.setPointSize(font.pointSize() - 1)
    fm = QFontMetricsF(font)
    fracWidth = fm.width(FractionSlider.WSTRING)
    indent = fm.boundingRect("9").width() / 2.0
    if not X11:
      fracWidth *= 1.5
    span = self.width() - (FractionSlider.XMARGIN * 2)
    value = self.__numerator / float(self.__denominator)
    painter = QPainter(self)
    painter.setRenderHint(QPainter.Antialiasing)
    painter.setRenderHint(QPainter.TextAntialiasing)
    painter.setPen(self.palette().color(QPalette.Mid))
    painter.setBrush(self.palette().brush(
        QPalette.AlternateBase))
    painter.drawRect(self.rect())
    segColor = QColor(Qt.green).darker(120)
    segLineColor = segColor.darker()
    painter.setPen(segLineColor)
    painter.setBrush(segColor)
    painter.drawRect(FractionSlider.XMARGIN,
             FractionSlider.YMARGIN, span, fm.height())
    textColor = self.palette().color(QPalette.Text)
    segWidth = span / self.__denominator
    segHeight = fm.height() * 2
    nRect = fm.boundingRect(FractionSlider.WSTRING)
    x = FractionSlider.XMARGIN
    yOffset = segHeight + fm.height()
    for i in range(self.__denominator + 1):
      painter.setPen(segLineColor)
      painter.drawLine(x, FractionSlider.YMARGIN, x, segHeight)
      painter.setPen(textColor)
      y = segHeight
      rect = QRectF(nRect)
      rect.moveCenter(QPointF(x, y + fm.height() / 2.0))
      #painter.drawText(rect, Qt.AlignCenter,
               #QString.number(i))
      painter.drawText(rect, Qt.AlignCenter,str(i))     
      y = yOffset
      rect.moveCenter(QPointF(x, y + fm.height() / 2.0))
      painter.drawText(rect, Qt.AlignCenter,
               str(self.__denominator))
      painter.drawLine(QPointF(rect.left() + indent, y),
               QPointF(rect.right() - indent, y))
      x += segWidth
    span = int(span)
    y = FractionSlider.YMARGIN - 0.5
    triangle = [QPointF(value * span, y),
          QPointF((value * span) +
              (2 * FractionSlider.XMARGIN), y),
          QPointF((value * span) +
              FractionSlider.XMARGIN, fm.height())]
    painter.setPen(Qt.yellow)
    painter.setBrush(Qt.darkYellow)
    painter.drawPolygon(QPolygonF(triangle))
 
 
if __name__ == "__main__":
  import sys
 
  app = QApplication(sys.argv)
  form = QDialog()
  sliderLabel = QLabel("&Fraction")
  slider = FractionSlider(denominator=12)
  sliderLabel.setBuddy(slider)
  denominatorLabel = QLabel("&Denominator")
  denominatorSpinBox = QSpinBox()
  denominatorLabel.setBuddy(denominatorSpinBox)
  denominatorSpinBox.setRange(3, 60)
  denominatorSpinBox.setValue(slider.fraction()[1])
  denominatorSpinBox.setAlignment(Qt.AlignRight|Qt.AlignVCenter)
  numeratorLabel = QLabel("Numerator")
  numeratorLCD = QLCDNumber()
  numeratorLCD.setSegmentStyle(QLCDNumber.Flat)
  layout = QGridLayout()
  layout.addWidget(sliderLabel, 0, 0)
  layout.addWidget(slider, 0, 1, 1, 5)
  layout.addWidget(numeratorLabel, 1, 0)
  layout.addWidget(numeratorLCD, 1, 1)
  layout.addWidget(denominatorLabel, 1, 2)
  layout.addWidget(denominatorSpinBox, 1, 3)
  form.setLayout(layout)
 
  def valueChanged(denominator):
    numerator = int(slider.decimal() * denominator)
    slider.setFraction(numerator, denominator)
    numeratorLCD.display(numerator)
 
  #form.connect(slider, SIGNAL("valueChanged(int,int)"),
         #numeratorLCD, SLOT("display(int)"))
  slider.valueChanged[int,int].connect(numeratorLCD.display)
  #form.connect(denominatorSpinBox, SIGNAL("valueChanged(int)"),
         #valueChanged)
  denominatorSpinBox.valueChanged[int].connect(valueChanged)
  form.setWindowTitle("Fraction Slider")
  form.show()
  app.exec_()

运行结果：

python3+PyQt5实现自定义分数滑块部件

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。

原文链接：https://blog.csdn.net/xiaoyangyang20/article/details/55253667

  • pyqt5
  • Python3
  • 滑块
  • 部件

    • 延伸 · 阅读

    精彩推荐
    最近更新
    编辑推荐
    阅读排行
    热门标签
    2048 　 6006 　 contextlib 　 SLOTS 　 MELIAE 　 FEEDPARSER 　 暂存 　 持久性管理 　 pickle模块 　 THREADING 　 reduce 　 nignx 　 装饰器 　 函数式编程 　 兔子毒药 　 监控文件 　 流量监控 　 Web框架 　 办公工具 　 PIL库 　 高斯模糊 　 wxPython 　 import 　 自定义模块 　 Python开发 　 元类 　 metaclass 　 魔术方法 　 DNSPod 　 动态解析域名 　
    © 2019-2023 脚本之家 | 服务器之家(www.zzvips.com)旗下站点 版权所有关于我们联系我们版权申明网站地图