将 PyQt5 QPixmap 和 QPushButtons 合并到 QDialog 内的 QtWidget 布局中

编程问答 2022-05-11

问题描述

一个外部模块启动了这个 QDialog 窗口，我想在其中添加标签、按钮和图像。在这个新窗口中，我正在为两个因素苦苦挣扎：1）它在按钮显示之前就点击了。 .addLayouts，图像总是出现在窗口的左上角（或在 .move 位置），而不是像预期的那样堆叠在 QHBoxLayouts 和 QVBoxLayouts 中。

外部模块调用窗口对象（见下面屏幕截图中的箭头）：

def photoButtonPressed(self):
        print("Photo button pressed")          
        
        photoWidget = FieldPhotos(self.photoFP,self.photoDT,self)
        photoWidget.show()

首先，我注释掉所有与像素图/图像相关的内容以对按钮进行故障排除，并且代码会在甚至显示窗口之前自动运行 updateImagePressed 方法（传递方向变量“next”）（更不用说单击下一步按钮） :

class FieldPhotos(QtWidgets.QDialog):

    def __init__(self,photoPath,photoDT,parent=None):        
        # Paths and DTs are lists of photos/datetimes within the time limit

        super().__init__(parent)
        self.setModal(True)
        self.photoPath = photoPath
        self.photoDT = photoDT
        self.left = 300
        self.top = 300
        self.width = 800
        self.height = 1000
        self.imageSelect = 0

        self.initUI()
        
    def initUI(self):
        self.setWindowTitle(f'{self.photoDT[0]} {os.path.split(self.photoPath[self.imageSelect])[-1]}')
        self.setGeometry(self.left,self.top,self.width,self.height)
    
        # Create widgets ############################
        # self.labelImage = QtWidgets.QLabel(self)
        labelNote = QtWidgets.QLabel('Close this window to continue.',self)   
        listLabel = QtWidgets.QLabel(f'Number of images found within 90 mins of data: {len(self.photoPath)} ',self)

        self.nextButton = QtWidgets.QPushButton('>')
        self.nextButton.setToolTip('Next image in list')

        self.previousButton = QtWidgets.QPushButton('<')
        self.previousButton.setToolTip('Previous image in list')
        self.nextButton.clicked.connect(self.updateImagePressed('next'))
        self.previousButton.clicked.connect(self.updateImagePressed('previous'))
                
        # Setup Layout ##################################
        self.VBox = QtWidgets.QVBoxLayout()
        # self.VBox.addWidget(labelImage)
        self.VBox.addWidget(labelNote)

        self.HBox = QtWidgets.QHBoxLayout()
        self.HBox.addWidget(listLabel)
        self.HBox.addWidget(self.previousButton)
        self.HBox.addWidget(self.nextButton)
        self.VBox.addLayout(self.HBox)

        # # Set initial photo
        # self.pixmap = QPixmap(self.photoPath[self.imageSelect])
        # self.pixmapScaled = self.pixmap.scaled(800,800,QtCore.Qt.KeepAspectRatio)
        # self.labelImage.setPixmap(self.pixmapScaled)
        # self.resize(self.pixmapScaled.width(),self.pixmapScaled.height())  
        # self.labelImage.move(0,100)  # Since it won't work in VBox,move down to make space?

        # self.updateImagePressed('first')

    def updateImagePressed(self,direction):
        print(f'Display {direction} image: {self.photoPath[self.imageSelect]}') 

        if self.imageSelect ==0:
            self.previousButton.setDisabled(1)
        if self.imageSelect == len(self.photoPath):
            self.nextButton.setDisabled(0)
        
        if direction == 'next':
            self.imageSelect += 1
        if direction == 'previous':
            self.imageSelect -= 1

        # Set photo
        # self.pixmap = QPixmap(self.photoPath[self.imageSelect])
        # self.pixmapScaled = self.pixmap.scaled(800,100)

结果如下：

Photo button pressed
Display next image: /Users/daurin/Projects_Supplemental/HyperPACE/field_data/HyperSAS/VIIRS2019/Photos/IMG_20190908_104845.jpg
Traceback (most recent call last):
  File "/Users/daurin/GitRepos/HyperInSPACE/Source/AnomalyDetection.py",line 356,in photoButtonPressed
    photoWidget = FieldPhotos(self.photoFP,self)
  File "/Users/daurin/GitRepos/HyperInSPACE/Source/FieldPhotos.py",line 28,in __init__
    self.initUI()
  File "/Users/daurin/GitRepos/HyperInSPACE/Source/FieldPhotos.py",line 45,in initUI
    self.nextButton.clicked.connect(self.updateImagePressed('next'))
TypeError: argument 1 has unexpected type 'NoneType'"

接下来，当我注释掉按钮动作时，并像这样恢复 QPixmap 代码：

def initUI(self):
        self.setWindowTitle(f'{self.photoDT[0]} {os.path.split(self.photoPath[self.imageSelect])[-1]}')
        self.setGeometry(self.left,self.height)
    
        # Create widgets ############################
        self.labelImage = QtWidgets.QLabel(self)
        labelNote = QtWidgets.QLabel('Close this window to continue.',self)

        self.nextButton = QtWidgets.QPushButton('>')
        self.nextButton.setToolTip('Next image in list')
        
        self.previousButton = QtWidgets.QPushButton('<')
        self.previousButton.setToolTip('Previous image in list')
        # self.nextButton.clicked.connect(self.updateImagePressed('next'))
        # self.previousButton.clicked.connect(self.updateImagePressed('previous'))
                
        # Setup Layout ##################################
        self.VBox = QtWidgets.QVBoxLayout()
        self.VBox.addWidget(self.labelImage)
        self.VBox.addWidget(labelNote)

        self.HBox = QtWidgets.QHBoxLayout()
        self.HBox.addWidget(listLabel)
        self.HBox.addWidget(self.previousButton)
        self.HBox.addWidget(self.nextButton)
        self.VBox.addLayout(self.HBox)

        # Set initial photo
        self.pixmap = QPixmap(self.photoPath[self.imageSelect])
        self.pixmapScaled = self.pixmap.scaled(800,QtCore.Qt.KeepAspectRatio)
        self.labelImage.setPixmap(self.pixmapScaled)
        self.resize(self.pixmapScaled.width(),self.pixmapScaled.height())  
        self.labelImage.move(0,move down to make space?

        # self.updateImagePressed('first')

它忽略了所有的 VBoxes 和 HBoxes，只在左上角堆积内容而忽略按钮：

enter image description here

解决方法

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pyqt5pythonqdialogqpixmapqpushbutton