PyQt-覆盖两个小部件而不影响交互UI-User
我目前正在做一些实验，将以下RangeSlider（由另一位用户完成）应用到更大的程序中。现在，用于选择时间间隔。我想修改代码，以便在感兴趣的地方看到一条垂直线。这里有一些我用图像编辑器做过的例子。
我所拥有的：
我想要什么：
在当前代码中，当我使用QLine和QPainter.drawLine添加一行时，我得到了该行，但是它的行为不符合我想要的方式。例如，当我移动绿色范围时，线条也随之移动（它应该是静态的）。它还会引起用户交互问题，因为例如，如果该行刚好位于范围的灰色部分上方，那么我将无法使用鼠标指针进行选择（就像该行重叠一样，并禁用范围的互动）
经过一些尝试，我无法在范围之上创建类似的东西。
这是我的代码（我适应于不显示任何行）。
import os
import sys
from PyQt4 import QtCore
from PyQt4 import QtGui
from PyQt4 import uic
from PyQt4.QtGui import QGridLayout, QSplitter, QGroupBox, QApplication, HBoxLayout, QWidget, QPainter, QColor, QFont
try:
_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
_fromUtf8 = lambda s: s
__all__ = ['QRangeSlider']
DEFAULT_CSS = """
QRangeSlider * {
border: 0px;
padding: 0px;
}
QRangeSlider #Head {
background: #a7adba;
}
QRangeSlider #Span {
background: #343d46;
}
QRangeSlider #Span:active {
background: #343d46;
}
QRangeSlider #Tail {
background: #a7adba;
}
QRangeSlider > QSplitter::handle {
background: #4f5b66;
}
QRangeSlider > QSplitter::handle:vertical {
height: 4px;
}
QRangeSlider > QSplitter::handle:pressed {
background: #ca5;
}
"""
def scale(val, src, dst):
"""
Scale the given value from the scale of src to the scale of dst.
"""
return int(((val - src[0]) / float(src[1]-src[0])) * (dst[1]-dst[0]) + dst[0])
class Ui_Form(object):
"""default range slider form"""
def setupUi(self, Form):
Form.setObjectName(_fromUtf8("QRangeSlider"))
Form.resize(300, 30)
Form.setStyleSheet(_fromUtf8(DEFAULT_CSS))
self.gridLayout = QGridLayout(Form)
self.gridLayout.setContentsMargins(0, 0, 0, 0)
self.gridLayout.setSpacing(0)
self.gridLayout.setObjectName(_fromUtf8("gridLayout"))
self._splitter = QSplitter(Form)
self._splitter.setMinimumSize(QtCore.QSize(0, 0))
self._splitter.setMaximumSize(QtCore.QSize(16777215, 16777215))
self._splitter.setOrientation(QtCore.Qt.Horizontal)
self._splitter.setObjectName(_fromUtf8("splitter"))
self._head = QGroupBox(self._splitter)
self._head.setTitle(_fromUtf8(""))
self._head.setObjectName(_fromUtf8("Head"))
self._handle = QGroupBox(self._splitter)
self._handle.setTitle(_fromUtf8(""))
self._handle.setObjectName(_fromUtf8("Span"))
self._tail = QGroupBox(self._splitter)
self._tail.setTitle(_fromUtf8(""))
self._tail.setObjectName(_fromUtf8("Tail"))
self.gridLayout.addWidget(self._splitter, 0, 0, 1, 1)
QtCore.QMetaObject.connectSlotsByName(Form)
class Element(QGroupBox):
def __init__(self, parent, main):
super(Element, self).__init__(parent)
self.main = main
def setStyleSheet(self, style):
"""redirect style to parent groupbox"""
self.parent().setStyleSheet(style)
def textColor(self):
"""text paint color"""
return getattr(self, '__textColor', QColor(125, 125, 125))
def setTextColor(self, color):
"""set the text paint color"""
if type(color) == tuple and len(color) == 3:
color = QColor(color[0], color[1], color[2])
elif type(color) == int:
color = QColor(color, color, color)
setattr(self, '__textColor', color)
def paintEvent(self, event):
"""overrides paint event to handle text"""
qp = QPainter()
qp.begin(self)
if self.main.drawValues():
self.drawText(event, qp)
qp.end()
class Head(Element):
"""area before the handle"""
def __init__(self, parent, main):
super(Head, self).__init__(parent, main)
def drawText(self, event, qp):
# Adding a line
qp.setPen(QColor(255, 0, 0))
qp.drawLine(25, 0, 25, 50)
qp.setPen(self.textColor())
qp.setFont(QFont('Arial', 10))
qp.drawText(event.rect(), QtCore.Qt.AlignLeft, str(self.main.min()))
class Tail(Element):
"""area after the handle"""
def __init__(self, parent, main):
super(Tail, self).__init__(parent, main)
def drawText(self, event, qp):
# Adding a line
qp.setPen(QColor(255, 0, 0))
qp.drawLine(50, 0, 50, 50)
qp.setPen(self.textColor())
qp.setFont(QFont('Arial', 10))
qp.drawText(event.rect(), QtCore.Qt.AlignRight, str(self.main.max()))
class Handle(Element):
"""handle area"""
def __init__(self, parent, main):
super(Handle, self).__init__(parent, main)
def drawText(self, event, qp):
# Adding a line
qp.setPen(QColor(255, 0, 0))
qp.drawLine(75, 0, 75, 50)
qp.setPen(self.textColor())
qp.setFont(QFont('Arial', 10))
qp.drawText(event.rect(), QtCore.Qt.AlignLeft, str(self.main.start()))
qp.drawText(event.rect(), QtCore.Qt.AlignRight, str(self.main.end()))
def mouseMoveEvent(self, event):
event.accept()
mx = event.globalX()
_mx = getattr(self, '__mx', None)
vrange = self.main.max() - self.main.min()
size = self.main.width()
step = vrange/size
if not _mx:
setattr(self, '__mx', mx)
dx = 0
else:
dx = mx - _mx
dx *= step
if -1 < dx < 1:
event.ignore()
return
dx = round(dx)
setattr(self, '__mx', mx)
s = self.main.start() + dx
e = self.main.end() + dx
if s >= self.main.min() and e <= self.main.max():
self.main.setRange(s, e)
def mousePressEvent(self, event):
setattr(self, '__mx', event.globalX())
class QRangeSlider(QWidget, Ui_Form):
"""
The QRangeSlider class implements a horizontal range slider widget.
Inherits QWidget.
Methods
* __init__ (self, QWidget parent = None)
* bool drawValues (self)
* int end (self)
* (int, int) getRange (self)
* int max (self)
* int min (self)
* int start (self)
* setBackgroundStyle (self, QString styleSheet)
* setDrawValues (self, bool draw)
* setEnd (self, int end)
* setStart (self, int start)
* setRange (self, int start, int end)
* setSpanStyle (self, QString styleSheet)
Signals
* endValueChanged (int)
* maxValueChanged (int)
* minValueChanged (int)
* startValueChanged (int)
Customizing QRangeSlider
You can style the range slider as below:
::
QRangeSlider * {
border: 0px;
padding: 0px;
}
QRangeSlider #Head {
background: #222;
}
QRangeSlider #Span {
background: #393;
}
QRangeSlider #Span:active {
background: #282;
}
QRangeSlider #Tail {
background: #222;
}
Styling the range slider handles follows QSplitter options:
::
QRangeSlider > QSplitter::handle {
background: #393;
}
QRangeSlider > QSplitter::handle:vertical {
height: 4px;
}
QRangeSlider > QSplitter::handle:pressed {
background: #ca5;
}
"""
endValueChanged = QtCore.pyqtSignal(int)
maxValueChanged = QtCore.pyqtSignal(int)
minValueChanged = QtCore.pyqtSignal(int)
startValueChanged = QtCore.pyqtSignal(int)
# define splitter indices
_SPLIT_START = 1
_SPLIT_END = 2
def __init__(self, parent=None):
"""Create a new QRangeSlider instance.
:param parent: QWidget parent
:return: New QRangeSlider instance.
"""
super(QRangeSlider, self).__init__(parent)
self.setupUi(self)
self.setMouseTracking(False)
self._splitter.splitterMoved.connect(self._handleMoveSplitter)
# head layout
self._head_layout = QHBoxLayout()
self._head_layout.setSpacing(0)
self._head_layout.setContentsMargins(0, 0, 0, 0)
self._head.setLayout(self._head_layout)
self.head = Head(self._head, main=self)
self._head_layout.addWidget(self.head)
# handle layout
self._handle_layout = QHBoxLayout()
self._handle_layout.setSpacing(0)
self._handle_layout.setContentsMargins(0, 0, 0, 0)
self._handle.setLayout(self._handle_layout)
self.handle = Handle(self._handle, main=self)
self.handle.setTextColor((150, 255, 150))
self._handle_layout.addWidget(self.handle)
# tail layout
self._tail_layout = QHBoxLayout()
self._tail_layout.setSpacing(0)
self._tail_layout.setContentsMargins(0, 0, 0, 0)
self._tail.setLayout(self._tail_layout)
self.tail = Tail(self._tail, main=self)
self._tail_layout.addWidget(self.tail)
# defaults
self.setMin(0)
self.setMax(99)
self.setStart(0)
self.setEnd(99)
self.setDrawValues(True)
def min(self):
""":return: minimum value"""
return getattr(self, '__min', None)
def max(self):
""":return: maximum value"""
return getattr(self, '__max', None)
def setMin(self, value):
"""sets minimum value"""
value = float(value)
assert type(value) is float
setattr(self, '__min', value)
self.minValueChanged.emit(value)
def setMax(self, value):
"""sets maximum value"""
value = float(value)
assert type(value) is float
setattr(self, '__max', value)
self.maxValueChanged.emit(value)
def start(self):
""":return: range slider start value"""
return getattr(self, '__start', None)
def end(self):
""":return: range slider end value"""
return getattr(self, '__end', None)
def _setStart(self, value):
"""stores the start value only"""
setattr(self, '__start', value)
self.startValueChanged.emit(value)
def setStart(self, value):
"""sets the range slider start value"""
value = float(value)
assert type(value) is float
v = self._valueToPos(value)
self._splitter.splitterMoved.disconnect()
self._splitter.moveSplitter(v, self._SPLIT_START)
self._splitter.splitterMoved.connect(self._handleMoveSplitter)
self._setStart(value)
def _setEnd(self, value):
"""stores the end value only"""
setattr(self, '__end', value)
self.endValueChanged.emit(value)
def setEnd(self, value):
"""set the range slider end value"""
value = float(value)
assert type(value) is float
v = self._valueToPos(value)
self._splitter.splitterMoved.disconnect()
self._splitter.moveSplitter(v, self._SPLIT_END)
self._splitter.splitterMoved.connect(self._handleMoveSplitter)
self._setEnd(value)
def drawValues(self):
""":return: True if slider values will be drawn"""
return getattr(self, '__drawValues', None)
def setDrawValues(self, draw):
"""sets draw values boolean to draw slider values"""
assert type(draw) is bool
setattr(self, '__drawValues', draw)
def getRange(self):
""":return: the start and end values as a tuple"""
return (self.start(), self.end())
def setRange(self, start, end):
"""set the start and end values"""
self.setStart(start)
self.setEnd(end)
def keyPressEvent(self, event):
"""overrides key press event to move range left and right"""
key = event.key()
if key == QtCore.Qt.Key_Left:
s = self.start()-1
e = self.end()-1
elif key == QtCore.Qt.Key_Right:
s = self.start()+1
e = self.end()+1
else:
event.ignore()
return
event.accept()
if s >= self.min() and e <= self.max():
self.setRange(s, e)
def setBackgroundStyle(self, style):
"""sets background style"""
self._tail.setStyleSheet(style)
self._head.setStyleSheet(style)
def setSpanStyle(self, style):
"""sets range span handle style"""
self._handle.setStyleSheet(style)
def _valueToPos(self, value):
"""converts slider value to local pixel x coord"""
return scale(value, (self.min(), self.max()), (0, self.width()))
def _posToValue(self, xpos):
"""converts local pixel x coord to slider value"""
return scale(xpos, (0, self.width()), (self.min(), self.max()))
def _handleMoveSplitter(self, xpos, index):
"""private method for handling moving splitter handles"""
hw = self._splitter.handleWidth()
def _lockWidth(widget):
width = widget.size().width()
widget.setMinimumWidth(width)
widget.setMaximumWidth(width)
def _unlockWidth(widget):
widget.setMinimumWidth(0)
widget.setMaximumWidth(16777215)
v = self._posToValue(xpos)
if index == self._SPLIT_START:
_lockWidth(self._tail)
if v >= self.end():
return
offset = -20
w = xpos + offset
self._setStart(v)
elif index == self._SPLIT_END:
_lockWidth(self._head)
if v <= self.start():
return
offset = -40
w = self.width() - xpos + offset
self._setEnd(v)
_unlockWidth(self._tail)
_unlockWidth(self._head)
_unlockWidth(self._handle)
app = QtGui.QApplication(sys.argv)
rs1 = QRangeSlider()
rs1.show()
rs1.setRange(15, 35)
rs1.setBackgroundStyle('background: qlineargradient(x1:0, y1:0, x2:0, y2:1, stop:0 #222, stop:1 #333);')
rs1.setSpanStyle('background: qlineargradient(x1:0, y1:0, x2:0, y2:1, stop:0 #282, stop:1 #393);')
app.exec_()
编辑：我修改了代码，以在移动范围时显示3行和不同的效果。
我猜问题是在同一个窗口小部件中创建行时出现的，因此我应该为行单独做一个。我说的对吗？
0 个答案:
没有答案
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