class Example(QWidget):
def __init__(self):
super(QWidget, self).__init__()
self.scrollBar = QScrollBar(Qt.Horizontal)
self.scrollBar.valueChanged.connect(self.customSlot)
self.messageBox = QMessageBox()
self.messageBox.setIcon(QMessageBox.Information)
self.messageBox.setWindowTitle('Информация')
layout = QVBoxLayout()
layout.addWidget(self.scrollBar)
self.setLayout(layout)
self.resize(300, 150)
self.show()
def customSlot(self, value):
self.setWindowTitle(str(value))
if value == self.scrollBar.maximum():
self.messageBox.setInformativeText('Был достигнут максимум')
self.messageBox.exec_()
if value == self.scrollBar.minimum():
self.messageBox.setInformativeText('Был достигнут минимум')
self.messageBox.exec_()
def bind(source: QScrollBar, target: QScrollBar) -> None:
# bind target scroll bar to `source` (range and value).
target.setRange(source.minimum(), source.maximum())
target.setValue(source.value())
source.rangeChanged.connect(target.setRange)
source.valueChanged.connect(target.setValue)
class GraphViewer(QWidget):
def __init__(self, parent):
super().__init__(parent)
self._y = 0
self._width = 1
self._height = 1
self.dot = Digraph(format='svg', strict=True)
self._declared_count = 1
self._declared = dict()
self._renderer = QSvgRenderer(self.dot.pipe(), self)
self.scrollbar = QScrollBar(self.parent())
self.scrollbar.setRange(0, 0)
self.parent().wheelEvent = self.wheelEvent
def wheelEvent(self, event):
if event.x() > self.getScrollWidth():
return
if event.y() > self._height:
return
self.scrollbar.wheelEvent(event)
def add(self, data):
# is variable
if data in self._declared.keys():
return self._declared[data]
if data.is_variable:
name = data.name
self._declared[data] = name
self.dot.node(name)
if data.toward is not None:
toward = self.add(data.toward)
self.dot.edge(toward, name)
return name
# is constant
if data.is_constant:
name = data.symbol
self._declared[data] = name
self.dot.node(name)
return name
# is operator
if data.is_operator:
name = '[%d] %s' % (self._declared_count, data.name)
self._declared_count += 1
self._declared[data] = name
self.dot.node(name)
args = [data.sub, data.obj, data.step]
if data.args is not None:
args += data.args
args = [arg for arg in args if arg is not None]
for arg in args:
arg = self.add(arg)
self.dot.edge(arg, name)
return name
def paintEvent(self, event):
self._width = self.width()
self._height = self.height()
self.scrollbar.setGeometry(self.getScrollWidth(), 0, 20, self._height)
self.resize(self._renderer.defaultSize())
painter = QPainter(self)
painter.restore()
drawRect = QRectF(self.rect())
if self.scrollbar.maximum() == 0:
draw_y = 0
else:
draw_y = drawRect.height() - self._height
draw_y *= self.scrollbar.value() / self.scrollbar.maximum()
drawRect.setY(-draw_y)
drawRect.setHeight(drawRect.y() + drawRect.height())
self._renderer.render(painter, drawRect)
def flush(self):
self._renderer = QSvgRenderer(self.dot.pipe())
max_h = self._renderer.defaultSize().height() / self._height
if max_h <= 1:
max_h = 0
max_h = int(self.delta() * max_h)
self.scrollbar.setMaximum(max_h)
def clear(self):
self._declared_count = 1
self._declared = dict()
self.dot.clear()
def getScrollWidth(self):
return self._width - 20
def delta(self):
return 3.14
class TextArea(QWidget):
"""
自定义文本展示区域（PS：不能键盘输入那种）
功能：能自动拉长文本区域并且带有滑动条
"""
def __init__(self, parent):
super().__init__(parent)
self.setContentsMargins(0, 0, 0, 0)
# 滚动条的宽度
# 对于水平方向的滚动条其实是高度
self.scrollBarWidth = 15
# 文本区
self.textContainer = TextView(self)
self.textContainer.setContentsMargins(5, 0, 0, 0)
# 设置居顶部显示
self.textContainer.setAlignment(Qt.AlignTop)
# 设置文本区域根据文本进行自适应
self.textContainer.adjustSize()
self.textContainer.setCallback(self.sizeChange)
# 垂直滚动条
self.vBar = QScrollBar(Qt.Vertical, self)
# self.vBar.sliderMoved.connect(self.dragV)
self.vBar.valueChanged.connect(self.changeVertical)
# 一开始隐藏
self.vBar.setVisible(False)
# 在水平方向上文字的总长度是否超过容器的宽度标志位
# 只要出现一次超过，那么 self.overHorizontal就永远是True
# 除非将超过容器宽度的文本都去除
self.overHorizontal = False
# 水平方向上滑块上一次的值
self.hPreValue = 0
# 水平滚动条
self.hBar = QScrollBar(Qt.Horizontal, self)
# self.hBar.sliderMoved.connect(self.dragH)
self.hBar.valueChanged.connect(self.changeHorizontal)
# 初始化的时候隐藏自身
self.hBar.setVisible(False)
# 在垂直方向上文字的总高度是否超过容器的高度标志位
# 只要出现一次超过，那么 self.overVertical就永远是True
# 除非将超过容器高度的文本都去除
self.overVertical = False
# 垂直方向上滑块上一次的值
self.vPreValue = 0
def setSize(self, width, height):
"""
设置TextArea的宽度和高度
:param width: 宽度
:param height: 高度
:return: no return
"""
self.resize(width, height)
self.setMaximumSize(width, height)
self.setMinimumSize(width, height)
# 设置垂直方向ScrollBar的宽度和高度
# 垂直方向ScrollBar的高度等于TextArea的高度
self.vBar.resize(self.scrollBarWidth, height - self.scrollBarWidth)
# 移动到指定位置
self.vBar.move(width - self.scrollBarWidth, 0)
# 设置水平方向的ScrollBar的宽度和高度
# 水平方向ScrollBar的高度为self.scrollBarWidth
self.hBar.resize(width, self.scrollBarWidth)
self.hBar.move(0, height - self.scrollBarWidth)
# 设置文本区域的高度和宽度
self.textContainer.resize(width, height)
self.setStyleSheet("background-color: #088A68;")
self.textContainer.setStyleSheet("border: 1px solid #FF0000; color: #FFFFFF;")
def setMaximumSize(self, maxw: int, maxh: int) -> None:
super().setMaximumSize(maxw, maxh)
def setClassName(self, textAreaName=None, labelName=None, vBarName=None, hBarName=None):
"""
设置ObjectName
:param textAreaName: TextArea的ObjectName
:param labelName: 文本区域的ObjectName
:param vBarName: 垂直ScrollBar的ObjectName
:param hBarName: 水平ScrollBar的ObjectName
:return:
"""
self.setObjectName(textAreaName)
self.textContainer.setObjectName(labelName)
self.hBar.setObjectName(hBarName)
self.vBar.setObjectName(vBarName)
def append(self, text):
self.textContainer.adjustSize()
self.textContainer.append(text)
margin = self.contentsMargins()
# 如果文本长度超过了容器的宽度， 将标准位置为True
# 并且显示水平滑动条
if self.textContainer.width() > (self.width() - margin.left() - margin.right()):
self.overHorizontal = True
self.hBar.setVisible(True)
# 如果文本总高度度超过了容器的宽度， 将标准位置为True
# 并且显示垂直滑动条
if self.textContainer.height() > (self.height() - margin.top() - margin.bottom()):
self.overVertical = True
self.vBar.setVisible(True)
def dragHortizontal(self, value):
"""
滑块水平方向上的拖拽事件
:argument value
:return:
"""
print("H: " + str(value))
def dragVertical(self, value):
"""
滑块垂直方向上的拖拽事件
:argument value
:return:
"""
print("V: " + str(value))
def changeHorizontal(self, v):
"""
垂直滑块的值发生改变时
:param v:
:return:
"""
if v == 0:
# 由于下列的操作会产生浮点型数据，所以在计算坐标的时候总有偏差
# 所以在 v = 0， 也就是滑动条回到最开始的地方，
# self.textContainer对应方向上的坐标也归0，那样就不会出问题了
self.textContainer.move(0, self.textContainer.y())
# 将当前值作为下一次的preValue
self.hPreValue = v
return
# print("change H: {}".format(v))
textW = self.textContainer.width()
# 最大值（从0开始计算）
maximum = self.hBar.maximum() + 1
# 计算每次改变值对应 self.textContainer在水平方向上需要移动的尺寸
stepW = textW / maximum
# 当前值与上一次的值得差
change = v - self.hPreValue
move = int(self.textContainer.x() - stepW * change)
self.textContainer.move(move, self.textContainer.y())
# 将当前值作为下一次的preValue
self.hPreValue = v
def changeVertical(self, v):
"""
水平滑块的值发生改变时
:param v:
:return:
"""
if v == 0:
# 由于下列的操作会产生浮点型数据，所以在计算坐标的时候总有偏差
# 所以在 v = 0， 也就是滑动条回到最开始的地方，
# self.textContainer对应方向上的坐标也归0，那样就不会出问题了
self.textContainer.move(self.textContainer.x(), 0)
self.vPreValue = v
return
# print("change V: {}".format(v))
textH = self.textContainer.width()
# 最大值（从0开始计算）
maximum = self.vBar.maximum() - self.vBar.minimum() + self.vBar.pageStep()
# 计算每次改变值对应 self.textContainer在水平方向上需要移动的尺寸
stepH = float(textH) / maximum
# 当前值与上一次的值得差
change = v - self.vPreValue
move = int(self.textContainer.y() - stepH * change)
self.textContainer.move(self.textContainer.x(), move)
# 将当前值作为下一次的preValue
self.vPreValue = v
def sizeChange(self, obj: QLabel):
print("size change:{},{} ".format(obj.width(), obj.height()))
def __init__(self, server):
super().__init__()
self.exit_condition = exit_condition
self.server = server
self.timer = QTimer()
self.timer.timeout.connect(self.show_message)
self.timer.start(500)
self.setWindowIcon(QIcon(os.path.join('pictures', 'raven.jpg')))
self.setWindowTitle("RavenChat")
# creating main labels
self.user_host = QLabel(
'Your host: ({}, {})'.format(self.server.server_ip,
self.server.server_port), self)
self.user_name = QLabel("Your name: {}".format(self.server.name), self)
self.online_label = QLabel("Users online", self)
# creating scroll bar
qsb = QScrollBar()
qsb.setTracking(False)
qsb.setSliderPosition(qsb.maximum())
# creating window to show users online
self.users_online = QTextEdit()
self.users_online.setReadOnly(True)
self.users_online.setHorizontalScrollBar(qsb)
self.users_online.setMaximumWidth(200)
self.users_online.setMinimumWidth(170)
# creating window to show chat messages
self.chat_window = QTextEdit()
self.chat_window.setReadOnly(True)
self.chat_window.setHorizontalScrollBar(qsb)
# creating button to send messages
self.sending_button = QPushButton(self)
self.sending_button.setIcon(
QIcon(os.path.join('pictures', 'feather.png')))
self.sending_button.setMaximumSize(100, 50)
self.sending_button.clicked.connect(self.send_message)
# creating menu
self.create_connection_action = QAction("Create connection")
self.create_connection_action.triggered.connect(self.create_connection)
self.change_name_action = QAction("Change name")
self.change_name_action.triggered.connect(self.change_name)
bar = self.menuBar()
self.bar = bar.addMenu('Settings')
self.bar.addAction(self.create_connection_action)
self.bar.addAction(self.change_name_action)
# creating line to write messages
self.send_line = QLineEdit()
# creating button to send files
self.file_sending_button = QPushButton(self)
self.file_sending_button.setIcon(
QIcon(os.path.join('pictures', 'file.png')))
self.file_sending_button.setMaximumSize(70, 50)
self.file_sending_button.clicked.connect(self.offer_file)
self.main_widget = QWidget()
self.main_widget.grid = QGridLayout()
# adding labels, windows and buttons in grid
self.main_widget.grid.addWidget(self.user_host, 1, 1, 1, 2)
self.main_widget.grid.addWidget(self.user_name, 2, 1, 1, 2)
self.main_widget.grid.addWidget(self.online_label, 3, 1, 1, 2)
self.main_widget.grid.addWidget(self.users_online, 4, 1, 1, 2)
self.main_widget.grid.addWidget(self.chat_window, 1, 3, 4, 1)
self.main_widget.grid.addWidget(self.send_line, 5, 3)
self.main_widget.grid.addWidget(self.sending_button, 5, 2)
self.main_widget.grid.addWidget(self.file_sending_button, 5, 1)
self.main_widget.setLayout(self.main_widget.grid)
self.setCentralWidget(self.main_widget)
self.main_widget.setGeometry(300, 300, 300, 300)
self.update_online_connections()
self.create_downloads_folder()
