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流式布局
流式布局,也叫做瀑布流布局,是网页中经常使用的一种页面布局方式,它的原理就是将高度固定,然后图片的宽度自适应,这样加载出来的图片看起来就像瀑布一样整齐的水流淌下来。
pyqt流式布局
那么在pyqt5中我们怎么使用流式布局呢?pyqt没有这个控件,需要我们自己去封装,下面是流式布局的封装代码。
class FlowLayout(QLayout): def __init__(self, parent=None, margin=0, spacing=-1): super(FlowLayout, self).__init__(parent) if parent is not None: self.setContentsMargins(margin, margin, margin, margin) self.setSpacing(spacing) self.itemList = [] def __del__(self): item = self.takeAt(0) while item: item = self.takeAt(0) def addItem(self, item): self.itemList.append(item) def count(self): return len(self.itemList) def itemAt(self, index): if index >= 0 and index < len(self.itemList): return self.itemList[index] return None def takeAt(self, index): if index >= 0 and index < len(self.itemList): return self.itemList.pop(index) return None def expandingDirections(self): return Qt.Orientations(Qt.Orientation(0)) def hasHeightForWidth(self): return True def heightForWidth(self, width): height = self.doLayout(QRect(0, 0, width, 0), True) return height def setGeometry(self, rect): super(FlowLayout, self).setGeometry(rect) self.doLayout(rect, False) def sizeHint(self): return self.minimumSize() def minimumSize(self): size = QSize() for item in self.itemList: size = size.expandedTo(item.minimumSize()) margin, _, _, _ = self.getContentsMargins() size += QSize(2 * margin, 2 * margin) return size def doLayout(self, rect, testOnly): x = rect.x() y = rect.y() lineHeight = 0 for item in self.itemList: wid = item.widget() spaceX = self.spacing() + wid.style().layoutSpacing(QSizePolicy.PushButton, QSizePolicy.PushButton, Qt.Horizontal) spaceY = self.spacing() + wid.style().layoutSpacing(QSizePolicy.PushButton, QSizePolicy.PushButton, Qt.Vertical) nextX = x + item.sizeHint().width() + spaceX if nextX - spaceX > rect.right() and lineHeight > 0: x = rect.x() y = y + lineHeight + spaceY nextX = x + item.sizeHint().width() + spaceX lineHeight = 0 if not testOnly: item.setGeometry(QRect(QPoint(x, y), item.sizeHint())) x = nextX lineHeight = max(lineHeight, item.sizeHint().height()) return y + lineHeight - rect.y()
封装好的流式布局类,我们只要传入相应的layout之后,他就会自动计算页面的元素,适应页面的宽度。
下面是我们写的一个瀑布流显示图片的代码:
from PyQt5.QtCore import QPoint, QRect, QSize, Qt import os from PyQt5 import QtCore, QtGui, QtWidgets from PyQt5.QtWidgets import ( QApplication, QLayout, QPushButton, QSizePolicy, QWidget, QGridLayout) class Window(QWidget): def __init__(self): self.imageheight = 100 super(Window, self).__init__() self.resize(400, 300) flowLayout = FlowLayout() highlight_dir = "./" self.files_it = iter([os.path.join(highlight_dir, file) for file in os.listdir(highlight_dir)]) print() for file in iter(self.files_it): layout = QGridLayout() pixmap = QtGui.QPixmap(file) if not pixmap.isNull(): autoWidth = pixmap.width()*self.imageheight/pixmap.height() label = QtWidgets.QLabel(pixmap=pixmap) label.setScaledContents(True) label.setFixedHeight(self.imageheight) print(autoWidth) label.setFixedWidth(autoWidth) #label.setFixedSize(100, 50) layout.addWidget(label) widget = QWidget() widget.setLayout(layout) flowLayout.addWidget(widget) self.setLayout(flowLayout) self.setWindowTitle("Flow Layout") class FlowLayout(QLayout): def __init__(self, parent=None, margin=0, spacing=-1): super(FlowLayout, self).__init__(parent) if parent is not None: self.setContentsMargins(margin, margin, margin, margin) self.setSpacing(spacing) self.itemList = [] def __del__(self): item = self.takeAt(0) while item: item = self.takeAt(0) def addItem(self, item): self.itemList.append(item) def count(self): return len(self.itemList) def itemAt(self, index): if index >= 0 and index < len(self.itemList): return self.itemList[index] return None def takeAt(self, index): if index >= 0 and index < len(self.itemList): return self.itemList.pop(index) return None def expandingDirections(self): return Qt.Orientations(Qt.Orientation(0)) def hasHeightForWidth(self): return True def heightForWidth(self, width): height = self.doLayout(QRect(0, 0, width, 0), True) return height def setGeometry(self, rect): super(FlowLayout, self).setGeometry(rect) self.doLayout(rect, False) def sizeHint(self): return self.minimumSize() def minimumSize(self): size = QSize() for item in self.itemList: size = size.expandedTo(item.minimumSize()) margin, _, _, _ = self.getContentsMargins() size += QSize(2 * margin, 2 * margin) return size def doLayout(self, rect, testOnly): x = rect.x() y = rect.y() lineHeight = 0 for item in self.itemList: wid = item.widget() spaceX = self.spacing() + wid.style().layoutSpacing(QSizePolicy.PushButton, QSizePolicy.PushButton, Qt.Horizontal) spaceY = self.spacing() + wid.style().layoutSpacing(QSizePolicy.PushButton, QSizePolicy.PushButton, Qt.Vertical) nextX = x + item.sizeHint().width() + spaceX if nextX - spaceX > rect.right() and lineHeight > 0: x = rect.x() y = y + lineHeight + spaceY nextX = x + item.sizeHint().width() + spaceX lineHeight = 0 if not testOnly: item.setGeometry(QRect(QPoint(x, y), item.sizeHint())) x = nextX lineHeight = max(lineHeight, item.sizeHint().height()) return y + lineHeight - rect.y() if __name__ == '__main__': import sys app = QApplication(sys.argv) mainWin = Window() mainWin.show() sys.exit(app.exec_())
到此这篇关于python GUI框架pyqt5 对图片进行流式布局的方法(瀑布流flowlayout)的文章就介绍到这了,更多相关python pyqt5图片流式布局内容请搜索亿速云以前的文章或继续浏览下面的相关文章希望大家以后多多支持亿速云!
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