python GUI框架pyqt5 对图片进行流式布局的方法（瀑布流flowlayout）

脚本专栏 2024/12/28 佚名

3 1 2

快活林资源网 Design By www.csstdc.com

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_())

python,pyqt5,python,图片流式布局,python,pyqt5,图片布局

快活林资源网 Design By www.csstdc.com

广告合作：本站广告合作请联系QQ：858582 申请时备注：广告合作（否则不回）
免责声明：本站资源来自互联网收集,仅供用于学习和交流,请遵循相关法律法规,本站一切资源不代表本站立场,如有侵权、后门、不妥请联系本站删除！

快活林资源网 Design By www.csstdc.com

评论“python GUI框架pyqt5 对图片进行流式布局的方法（瀑布流flowlayout）”

暂无评论...

www.csstdc.com 快活林资源网

120,135影音资源

344,641技术资源

22,817软件资源

435,032站长资源

python GUI框架pyqt5 对图片进行流式布局的方法（瀑布流flowlayout）

python字典和json.dumps()的遇到的坑分析

解决pyecharts运行后产生的html文件用浏览器打开空白

评论“python GUI框架pyqt5 对图片进行流式布局的方法（瀑布流flowlayout）”

RTX 5090要首发性能要翻倍！三星展示GDDR7显存

更新日志

友情链接

python GUI框架pyqt5 对图片进行流式布局的方法（瀑布流flowlayout）

python字典和json.dumps()的遇到的坑分析

解决pyecharts运行后产生的html文件用浏览器打开空白

评论“python GUI框架pyqt5 对图片进行流式布局的方法（瀑布流flowlayout）”

RTX 5090要首发 性能要翻倍！三星展示GDDR7显存

更新日志

友情链接

RTX 5090要首发性能要翻倍！三星展示GDDR7显存