删除自定义Item
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Irony
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5 changed files with 109 additions and 84 deletions
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@ -24,6 +24,7 @@ encoding//\u5176\u5B83/\u81EA\u5B9A\u4E49import/src/test.py=utf-8
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encoding//\u5176\u5B83/\u81EA\u5B9A\u4E49\u5C5E\u6027\u6D4B\u8BD5/\u81EA\u5B9A\u4E49\u5C5E\u6027\u6D4B\u8BD5.py=utf-8
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encoding//\u5217\u8868/QListView/\u663E\u793A\u81EA\u5B9A\u4E49Widget.py=utf-8
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encoding//\u5217\u8868/QListView/\u663E\u793A\u81EA\u5B9A\u4E49Widget\u5E76\u6392\u5E8F.py=utf-8
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encoding//\u5217\u8868/QListWidget/\u5220\u9664\u81EA\u5B9A\u4E49Item.py=utf-8
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encoding//\u5217\u8868/QListWidget/\u817E\u8BAF\u89C6\u9891\u70ED\u64AD\u5217\u8868/TencentMovieHotPlay.py=utf-8
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encoding//\u5217\u8868/QListWidget/\u817E\u8BAF\u89C6\u9891\u70ED\u64AD\u5217\u8868/TencentMovieHotPlay_Flow.py=utf-8
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encoding//\u5217\u8868/QListWidget/\u817E\u8BAF\u89C6\u9891\u70ED\u64AD\u5217\u8868/TencentMovieHotPlay_ListWidget.py=utf-8
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@ -1,83 +0,0 @@
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# QListWidget 拖拽、框选
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```python
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# 隐藏横向滚动条
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self.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
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# 不能编辑
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self.setEditTriggers(self.NoEditTriggers)
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# 开启拖功能
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self.setDragEnabled(True)
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# 只能往外拖
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self.setDragDropMode(self.DragOnly)
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# 忽略放
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self.setDefaultDropAction(Qt.IgnoreAction)
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# ****重要的一句（作用是可以单选，多选。Ctrl、Shift多选，可从空白位置框选）****
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# ****不能用ExtendedSelection,因为它可以在选中item后继续框选会和拖拽冲突****
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self.setSelectionMode(self.ContiguousSelection)
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# 设置从左到右、自动换行、依次排列
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self.setFlow(self.LeftToRight)
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self.setWrapping(True)
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self.setResizeMode(self.Adjust)
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# item的间隔
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self.setSpacing(5)
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# 橡皮筋(用于框选效果)
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self._rubberPos = None
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self._rubberBand = QRubberBand(QRubberBand.Rectangle, self)
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```
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## 拖动Item
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```python
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# 实现拖拽的时候预览效果图
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# 这里演示拼接所有的item截图(也可以自己写算法实现堆叠效果)
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def startDrag(self, supportedActions):
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items = self.selectedItems()
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drag = QDrag(self)
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mimeData = self.mimeData(items)
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# 由于QMimeData只能设置image、urls、str、bytes等等不方便
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# 这里添加一个额外的属性直接把item放进去,后面可以根据item取出数据
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mimeData.setProperty('myItems', items)
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drag.setMimeData(mimeData)
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pixmap = QPixmap(self.viewport().visibleRegion().boundingRect().size())
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pixmap.fill(Qt.transparent)
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painter = QPainter()
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painter.begin(pixmap)
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for item in items:
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rect = self.visualRect(self.indexFromItem(item))
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painter.drawPixmap(rect, self.viewport().grab(rect))
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painter.end()
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drag.setPixmap(pixmap)
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drag.setHotSpot(self.viewport().mapFromGlobal(QCursor.pos()))
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drag.exec_(supportedActions)
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```
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## 模拟框选
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```python
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def mousePressEvent(self, event):
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# 列表框点击事件,用于设置框选工具的开始位置
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super(DragListWidget, self).mousePressEvent(event)
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if event.buttons() != Qt.LeftButton or self.itemAt(event.pos()):
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return
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self._rubberPos = event.pos()
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self._rubberBand.setGeometry(QRect(self._rubberPos, QSize()))
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self._rubberBand.show()
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def mouseReleaseEvent(self, event):
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# 列表框点击释放事件,用于隐藏框选工具
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super(DragListWidget, self).mouseReleaseEvent(event)
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self._rubberPos = None
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self._rubberBand.hide()
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def mouseMoveEvent(self, event):
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# 列表框鼠标移动事件,用于设置框选工具的矩形范围
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super(DragListWidget, self).mouseMoveEvent(event)
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if self._rubberPos:
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pos = event.pos()
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lx, ly = self._rubberPos.x(), self._rubberPos.y()
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rx, ry = pos.x(), pos.y()
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size = QSize(abs(rx - lx), abs(ry - ly))
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self._rubberBand.setGeometry(
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QRect(QPoint(min(lx, rx), min(ly, ry)), size))
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```
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## 截图
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BIN
列表/QListWidget/ScreenShot/删除自定义Item.gif
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列表/QListWidget/ScreenShot/删除自定义Item.gif
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99
列表/QListWidget/删除自定义Item.py
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列表/QListWidget/删除自定义Item.py
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@ -0,0 +1,99 @@
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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Created on 2018年11月4日
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@author: Irony
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@site: https://pyqt5.com, https://github.com/892768447
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@email: 892768447@qq.com
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@file: 删除Item
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@description:
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"""
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from PyQt5.QtCore import QSize, pyqtSignal
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from PyQt5.QtWidgets import QWidget, QHBoxLayout, QLineEdit, QPushButton,\
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QListWidgetItem, QVBoxLayout, QListWidget
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__Author__ = """By: Irony
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QQ: 892768447
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Email: 892768447@qq.com"""
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__Copyright__ = 'Copyright (c) 2018 Irony'
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__Version__ = 1.0
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class ItemWidget(QWidget):
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itemDeleted = pyqtSignal(QListWidgetItem)
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def __init__(self, text, item, *args, **kwargs):
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super(ItemWidget, self).__init__(*args, **kwargs)
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self._item = item # 保留list item的对象引用
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layout = QHBoxLayout(self)
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layout.setContentsMargins(0, 0, 0, 0)
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layout.addWidget(QLineEdit(text, self))
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layout.addWidget(QPushButton('x', self, clicked=self.doDeleteItem))
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def doDeleteItem(self):
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self.itemDeleted.emit(self._item)
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def sizeHint(self):
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# 决定item的高度
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return QSize(200, 40)
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class Window(QWidget):
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def __init__(self, *args, **kwargs):
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super(Window, self).__init__(*args, **kwargs)
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layout = QVBoxLayout(self)
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# 列表
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self.listWidget = QListWidget(self)
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layout.addWidget(self.listWidget)
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# 清空按钮
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self.clearBtn = QPushButton('清空', self, clicked=self.doClearItem)
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layout.addWidget(self.clearBtn)
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# 添加测试数据
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self.testData()
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def doDeleteItem(self, item):
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# 根据item得到它对应的行数
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row = self.listWidget.indexFromItem(item).row()
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# 删除item
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item = self.listWidget.takeItem(row)
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# 删除widget
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self.listWidget.removeItemWidget(item)
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del item
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def doClearItem(self):
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# 清空所有Item
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for _ in range(self.listWidget.count()):
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# 删除item
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# 一直是0的原因是一直从第一行删,删掉第一行后第二行变成了第一行
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# 这个和删除list [] 里的数据是一个道理
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item = self.listWidget.takeItem(0)
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# 删除widget
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self.listWidget.removeItemWidget(item)
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del item
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def testData(self):
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# 生成测试数据
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for i in range(100):
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item = QListWidgetItem(self.listWidget)
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widget = ItemWidget('item: {}'.format(i), item, self.listWidget)
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# 绑定删除信号
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widget.itemDeleted.connect(self.doDeleteItem)
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self.listWidget.setItemWidget(item, widget)
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if __name__ == '__main__':
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import sys
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import cgitb
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sys.excepthook = cgitb.enable(1, None, 5, 'text')
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from PyQt5.QtWidgets import QApplication
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app = QApplication(sys.argv)
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w = Window()
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w.show()
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sys.exit(app.exec_())
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10
列表/README.md
10
列表/README.md
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@ -24,4 +24,12 @@
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1. 使用`QNetworkAccessManager`进行异步下载数据和图片
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2. 滚动条滑动到底部加载更多
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### 3. [删除自定义Item](QListWidget/删除自定义Item.py)
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1. 删除item时先要通过`QListWidget.indexFromItem(item).row()`得到它的行数
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2. 通过`takeItem`函数取出该Item并删除掉,`item = self.listWidget.takeItem(row)`
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3. 移除item对应的自定义控件`self.listWidget.removeItemWidget(item)`
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4. 如果是清空所有Item，可以通过循环删除，但是删除的时候行号一直是0即可，原因和删除list数组一样。
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