以下是视频监控系统的代码。我想在每个相机的右下角添加一个QToolButton。
我对这个按钮有两个要求。首先，按钮应该只有当我将鼠标悬停在视频帧上时才可见。其次，我希望有下拉功能，而不是下拉功能。
编辑：如果可能的话，我也想删除QToolButton的小箭头符号。
我怎样才能做到这一点？
from PyQt4 import QtCore, QtGui
from threading import Thread
from collections import deque
from datetime import datetime
import time
import sys
import cv2
import imutils
class CameraWidget(QtGui.QWidget):
"""Independent camera feed
Uses threading to grab IP camera frames in the background
@param width - Width of the video frame
@param height - Height of the video frame
@param stream_link - IP/RTSP/Webcam link
@param aspect_ratio - Whether to maintain frame aspect ratio or force into fraame
"""
def __init__(self, width, height, stream_link=0, aspect_ratio=False, parent=None, deque_size=1):
super(CameraWidget, self).__init__(parent)
# Initialize deque used to store frames read from the stream
self.deque = deque(maxlen=deque_size)
# Slight offset is needed since PyQt layouts have a built in padding
# So add offset to counter the padding
self.offset = 16
self.screen_width = width - self.offset
self.screen_height = height - self.offset
self.maintain_aspect_ratio = aspect_ratio
self.camera_stream_link = stream_link
# Flag to check if camera is valid/working
self.online = False
self.capture = None
self.video_frame = QtGui.QLabel()
self.load_network_stream()
# Start background frame grabbing
self.get_frame_thread = Thread(target=self.get_frame, args=())
self.get_frame_thread.daemon = True
self.get_frame_thread.start()
# Periodically set video frame to display
self.timer = QtCore.QTimer()
self.timer.timeout.connect(self.set_frame)
self.timer.start(.5)
print('Started camera: {}'.format(self.camera_stream_link))
def load_network_stream(self):
"""Verifies stream link and open new stream if valid"""
def load_network_stream_thread():
if self.verify_network_stream(self.camera_stream_link):
self.capture = cv2.VideoCapture(self.camera_stream_link)
self.online = True
self.load_stream_thread = Thread(target=load_network_stream_thread, args=())
self.load_stream_thread.daemon = True
self.load_stream_thread.start()
def verify_network_stream(self, link):
"""Attempts to receive a frame from given link"""
cap = cv2.VideoCapture(link)
if not cap.isOpened():
return False
cap.release()
return True
def get_frame(self):
"""Reads frame, resizes, and converts image to pixmap"""
while True:
try:
if self.capture.isOpened() and self.online:
# Read next frame from stream and insert into deque
status, frame = self.capture.read()
if status:
self.deque.append(frame)
else:
self.capture.release()
self.online = False
else:
# Attempt to reconnect
print('attempting to reconnect', self.camera_stream_link)
self.load_network_stream()
self.spin(2)
self.spin(.001)
except AttributeError:
pass
def spin(self, seconds):
"""Pause for set amount of seconds, replaces time.sleep so program doesnt stall"""
time_end = time.time() + seconds
while time.time() < time_end:
QtGui.QApplication.processEvents()
def set_frame(self):
"""Sets pixmap image to video frame"""
if not self.online:
self.spin(1)
return
if self.deque and self.online:
# Grab latest frame
frame = self.deque[-1]
# Keep frame aspect ratio
if self.maintain_aspect_ratio:
self.frame = imutils.resize(frame, width=self.screen_width)
# Force resize
else:
self.frame = cv2.resize(frame, (self.screen_width, self.screen_height))
# Convert to pixmap and set to video frame
self.img = QtGui.QImage(self.frame, self.frame.shape[1], self.frame.shape[0], QtGui.QImage.Format_RGB888).rgbSwapped()
self.pix = QtGui.QPixmap.fromImage(self.img)
self.video_frame.setPixmap(self.pix)
def get_video_frame(self):
return self.video_frame
if __name__ == '__main__':
# Create main application window
app = QtGui.QApplication([])
app.setStyle(QtGui.QStyleFactory.create("Cleanlooks"))
mw = QtGui.QMainWindow()
mw.setWindowTitle('Camera GUI')
cw = QtGui.QWidget()
ml = QtGui.QGridLayout()
cw.setLayout(ml)
mw.setCentralWidget(cw)
mw.showMaximized()
# Dynamically determine screen width/height
screen_width = QtGui.QApplication.desktop().screenGeometry().width()
screen_height = QtGui.QApplication.desktop().screenGeometry().height()
# Create Camera Widgets
username = 'Your camera username!'
password = 'Your camera password!'
# Stream links
camera0 = 'rtsp://{}:{}@192.168.1.43:554/cam/realmonitor?channel=1&subtype=0'.format(username, password)
camera1 = 'rtsp://{}:{}@192.168.1.45/axis-media/media.amp'.format(username, password)
camera2 = 'rtsp://{}:{}@192.168.1.47:554/cam/realmonitor?channel=1&subtype=0'.format(username, password)
camera3 = 'rtsp://{}:{}@192.168.1.40:554/cam/realmonitor?channel=1&subtype=0'.format(username, password)
camera4 = 'rtsp://{}:{}@192.168.1.44:554/cam/realmonitor?channel=1&subtype=0'.format(username, password)
camera5 = 'rtsp://{}:{}@192.168.1.42:554/cam/realmonitor?channel=1&subtype=0'.format(username, password)
camera6 = 'rtsp://{}:{}@192.168.1.46:554/cam/realmonitor?channel=1&subtype=0'.format(username, password)
camera7 = 'rtsp://{}:{}@192.168.1.41:554/cam/realmonitor?channel=1&subtype=0'.format(username, password)
# Create camera widgets
print('Creating Camera Widgets...')
zero = CameraWidget(screen_width//3, screen_height//3, camera0)
one = CameraWidget(screen_width//3, screen_height//3, camera1)
two = CameraWidget(screen_width//3, screen_height//3, camera2)
three = CameraWidget(screen_width//3, screen_height//3, camera3)
four = CameraWidget(screen_width//3, screen_height//3, camera4)
five = CameraWidget(screen_width//3, screen_height//3, camera5)
six = CameraWidget(screen_width//3, screen_height//3, camera6)
seven = CameraWidget(screen_width//3, screen_height//3, camera7)
# Add widgets to layout
print('Adding widgets to layout...')
ml.addWidget(zero.get_video_frame(),0,0,1,1)
ml.addWidget(one.get_video_frame(),0,1,1,1)
ml.addWidget(two.get_video_frame(),0,2,1,1)
ml.addWidget(three.get_video_frame(),1,0,1,1)
ml.addWidget(four.get_video_frame(),1,1,1,1)
ml.addWidget(five.get_video_frame(),1,2,1,1)
ml.addWidget(six.get_video_frame(),2,0,1,1)
ml.addWidget(seven.get_video_frame(),2,1,1,1)
print('Verifying camera credentials...')
mw.show()
您需要的是通过在构造函数中使用标签作为父按钮，将子按钮添加到标签中(这也可以通过setParent()来完成(。
class VideoWidget(QtWidgets.QLabel):
def __init__(self):
super().__init__()
# create a button that is a *child* of *this* widget ("self")
self.button = QtWidgets.QToolButton(self)
# hide the button, otherwise it will be automatically visible as soon
# as this VideoWidget will be shown
self.button.setVisible(False)
self.buttonOffset = 5
# just for testing
self.setPixmap(QtGui.QPixmap('frame.png'))
def updateButtonGeometry(self):
# create a rectangle based on the sizeHint of the button, it will
# be used to set its geometry
geo = QtCore.QRect(QtCore.QPoint(), self.button.sizeHint())
# move the rectangle to the bottom right corner, using an offset
# as a margin from the border
offset = QtCore.QPoint(self.buttonOffset, self.buttonOffset)
geo.moveBottomRight(self.rect().bottomRight() - offset)
# apply the geometry
self.button.setGeometry(geo)
def enterEvent(self, event):
self.button.setVisible(True)
self.updateButtonGeometry()
def leaveEvent(self, event):
self.button.setVisible(False)
def resizeEvent(self, event):
self.updateButtonGeometry()
class VideoContainer(QtWidgets.QWidget):
'''
An example class to display some widgets in a grid layout
'''
def __init__(self):
super().__init__()
self.videoWidgets = []
layout = QtWidgets.QGridLayout(self)
for row in range(3):
for col in range(3):
videoWidget = VideoWidget()
layout.addWidget(videoWidget, row, col)
self.videoWidgets.append(videoWidget)
关于代码的一个考虑因素(顺便说一句，这对这件事来说是不必要的复杂(：你正在创建VideoWidget类，但你从来没有使用过它们，这使得它们几乎毫无用处。只需从QLabel派生子类并直接使用其实例。