动态加载图片

This commit is contained in:
Irony 2020-06-03 11:28:35 +08:00
parent de452f9c32
commit 651924e9ef
4 changed files with 119 additions and 0 deletions

104
QTextBrowser/DynamicRes.py Normal file
View file

@ -0,0 +1,104 @@
#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Created on 2020/6/3
@author: Irony
@site: https://pyqt.site https://github.com/PyQt5
@email: 892768447@qq.com
@file: DynamicRes
@description:
"""
from threading import Thread
import requests
from PyQt5.QtCore import QUrl, QByteArray
from PyQt5.QtGui import QImage, QTextDocument
from PyQt5.QtWidgets import QTextBrowser, QWidget, QVBoxLayout, QPushButton
__Author__ = 'Irony'
__Copyright__ = 'Copyright (c) 2020'
__Version__ = 'Version 1.0'
class TextBrowser(QTextBrowser):
NetImages = {}
def __init__(self, *args, **kwargs):
super(TextBrowser, self).__init__(*args, **kwargs)
self.setOpenLinks(False) # 禁止打开URL
def downloadImage(self, url):
try:
self.NetImages[url] = [QByteArray(requests.get(url.toString()).content), 1]
print('下载完成', url)
except Exception as e:
print('下载失败', url, e)
self.NetImages[url] = [QByteArray(), 1]
def loadResource(self, rtype, url):
ret = super(TextBrowser, self).loadResource(rtype, url)
# 加载图片资源
if rtype == QTextDocument.ImageResource:
if ret:
return ret
if url.toString().startswith('irony'): # 自定义的协议头
print('加载本地', '../Donate/zhifubao.png', url)
return QImage('../Donate/zhifubao.png') # 或者 QByteArray(open('../Donate/zhifubao.png', 'rb').read())
elif url.toString().startswith('http'): # 加载网络图片
img, status = self.NetImages.get(url, [None, None])
if url not in self.NetImages or status is None:
# 子线程下载
self.NetImages[url] = [None, 1]
print('download ', url)
Thread(target=self.downloadImage, args=(url,), daemon=True).start()
elif img:
return img
return ret
def mouseDoubleClickEvent(self, event):
# 双击图片得到图片的URL也可以用来放大显示
super(TextBrowser, self).mouseDoubleClickEvent(event)
url = self.anchorAt(event.pos())
if url:
print('url:', url, self.document().resource(QTextDocument.ImageResource, QUrl(url)))
class Window(QWidget):
def __init__(self, *args, **kwargs):
super(Window, self).__init__(*args, **kwargs)
layout = QVBoxLayout(self)
self.textBrowser = TextBrowser(self)
self.downButton = QPushButton('加载网络图片', self)
layout.addWidget(self.textBrowser)
layout.addWidget(self.downButton)
# 加载本地图片
img = QImage('../Donate/weixin.png')
# 第二个参数为任意唯一的url类似于qrc方式
self.textBrowser.document().addResource(QTextDocument.ImageResource, QUrl('dynamic:/images/weixin.png'), img)
# 设置html
# 需要注意里面的图片地址
self.textBrowser.setHtml(
'<p><a href="../Donate/weixin.png"><img src="../Donate/weixin.png"></a></p>' # 方式一直接加载本地图片
'<p><a href="dynamic:/images/weixin.png"><img src="dynamic:/images/weixin.png"></a></p>' # 方式二通过addResource添加资源
'<p><a href="irony://zhifubao.png"><img src="irony://zhifubao.png"></a></p>' # 方式三定义自定义的协议头通过loadResource动态加载
'<p><a href="https://blog.pyqt5.com/img/avatar.png"><img ' # 方式四类似方式三,只不过需要从网络中下载
'src="https://blog.pyqt5.com/img/avatar.png"></a></p>')
if __name__ == '__main__':
import sys
import cgitb
cgitb.enable(1, None, 5, '')
from PyQt5.QtWidgets import QApplication
app = QApplication(sys.argv)
w = Window()
w.show()
sys.exit(app.exec_())

View file

@ -0,0 +1,14 @@
# QTextBrowser
- 目录
- [动态加载图片](#1动态加载图片)
## 1、动态加载图片
[运行 DynamicRes.py](DynamicRes.py)
动态加载资源有多种方式,这里主要介绍 [addResource](https://doc.qt.io/qt-5/qtextdocument.html#addResource) 和 [loadResource](https://doc.qt.io/qt-5/qtextbrowser.html#loadResource) 函数
1、通过 `self.textBrowser.document().addResource(QTextDocument.ImageResource, QUrl('dynamic:/images/weixin.png'), img)` 向文档中注册新的资源索引类似QRC
2、通过重载 `loadResource` 函数可以监听到所有的资源加载,然后动态返回内容
![DynamicRes](ScreenShot/DynamicRes.gif)

Binary file not shown.

After

Width:  |  Height:  |  Size: 744 KiB

View file

@ -113,6 +113,7 @@ https://pyqt.site 论坛是专门针对PyQt5学习和提升开设的网站
- [显示.9格式图片(气泡)](QLabel/NinePatch.py) - [显示.9格式图片(气泡)](QLabel/NinePatch.py)
- [圆形图片](QLabel/CircleImage.py) - [圆形图片](QLabel/CircleImage.py)
- [QTextBrowser](QTextBrowser) - [QTextBrowser](QTextBrowser)
- [动态加载图片](QTextBrowser/DynamicRes.py)
- [QGraphicsView](QGraphicsView) - [QGraphicsView](QGraphicsView)
- [绘制世界地图](QGraphicsView/WorldMap.py) - [绘制世界地图](QGraphicsView/WorldMap.py)
- [添加QWidget](QGraphicsView/AddQWidget.py) - [添加QWidget](QGraphicsView/AddQWidget.py)