将 QToolButton 放在视频帧的顶部
Place a QToolButton on top of a video frame
下面是一个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，只有当我将鼠标悬停在该视频帧 上时， 按钮才应该可见。其次，我想要 drop up 功能而不是下拉功能。
编辑：如果可能我也想去掉QToolButton的小箭头。
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()
你需要在标签上添加一个 child 按钮，在构造函数中使用标签作为父按钮（这也可以通过 setParent()).
class VideoWidget(QtWidgets.QLabel):
def __init__(self):
super().__init__()
# create a button that is a *child* of *this* widget ("self")
self.button = QtWidgets.QToolButton(<b>self</b>)
# 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)
关于您的代码的考虑（顺便说一下，对于这件事来说，它是不必要的复杂）：您正在创建 VideoWidget 类，但您从不使用它们，这使它们几乎毫无用处。只是 QLabel 的子类并直接使用它的实例。
下面是一个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，只有当我将鼠标悬停在该视频帧 上时， 按钮才应该可见。其次，我想要 drop up 功能而不是下拉功能。
编辑：如果可能我也想去掉QToolButton的小箭头。
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()
你需要在标签上添加一个 child 按钮，在构造函数中使用标签作为父按钮（这也可以通过 setParent()).
class VideoWidget(QtWidgets.QLabel):
def __init__(self):
super().__init__()
# create a button that is a *child* of *this* widget ("self")
self.button = QtWidgets.QToolButton(<b>self</b>)
# 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)
关于您的代码的考虑（顺便说一下，对于这件事来说，它是不必要的复杂）：您正在创建 VideoWidget 类，但您从不使用它们，这使它们几乎毫无用处。只是 QLabel 的子类并直接使用它的实例。