本文介紹了如何使用 QWebEngineView 打開下載文件對話框?的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！
問題描述
我正在構建一個 pyqt5 桌面界面，我在其中使用 QWebEngineView 來顯示一個 html 文件，我在其中顯示一個傳單地圖.這工作正常.下一步是導出用戶添加到地圖的所有要素.當我點擊地圖上的導出功能"時，什么也沒有發(fā)生，但是當我在 Chromium 網(wǎng)絡瀏覽器上打開相同的 html 文件時，導出功能"會打開下載對話框.
I'm building a pyqt5 desktop interface where I'm using QWebEngineView to show a html file where I show a Leaflet map. This is working fine. The next step is to export all features the user added to the map. When I click on "Export Features" on the map nothing happen, but when I open the same html file on my Chromium web browser, the "Export feature" opens the download dialog fine.
PyQt5 腳本:
self.MainWindow.webMapViewer = QtWebEngineWidgets.QWebEngineView()
self.MainWindow.webPageLayout.addWidget(self.MainWindow.webMapViewer)
self.html_path = os.path.split(os.path.abspath(__file__))[0] + r'/html/test.html'
self.MainWindow.webMapViewer.load(QtCore.QUrl().fromLocalFile(self.html_path))
HTML:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name='viewport' content='width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no' />
<title>FazMaraneyRGB_transparent_mosaic_group1</title>
<!-- Leaflet -->
<link rel="stylesheet" />
<script src="http://cdn.leafletjs.com/leaflet-0.7.5/leaflet.js"></script>
<!-- Leaflet.draw -->
<link rel="stylesheet" />
<script src="https://unpkg.com/leaflet-draw@0.4.1/dist/leaflet.draw.js"></script>
<!-- Leaflet Ajax -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet-ajax/2.1.0/leaflet.ajax.min.js"></script>
<!-- Leaflet Measument -->
<link rel="stylesheet" />
<script src="http://ljagis.github.io/leaflet-measure/leaflet-measure.min.js"></script>
<style>
body { margin:0; padding:0; }
body, table, tr, td, th, div, h1, h2, input { font-family: "Calibri", "Trebuchet MS", "Ubuntu", Serif; font-size: 11pt; }
#map { position:absolute; top:0; bottom:0; width:100%; } /* full size */
.ctl {
padding: 2px 10px 2px 10px;
background: white;
background: rgba(255,255,255,0.9);
box-shadow: 0 0 15px rgba(0,0,0,0.2);
border-radius: 5px;
text-align: right;
}
.title {
font-size: 18pt;
font-weight: bold;
}
.src {
font-size: 10pt;
}
#delete, #export {
position: absolute;
top:100px;
right:10px;
z-index:100;
background:white;
color:black;
padding:6px;
border-radius:4px;
font-family: 'Helvetica Neue';
cursor: pointer;
font-size:12px;
text-decoration:none;
}
#export {
top:130px;
}
</style>
</head>
<body>
<div id='map'></div>
<div id='delete'>Delete Features</div>
<a href='#' id='export'>Export Features</a>
<script>
/* **** Leaflet **** */
// Base layers
// .. OpenStreetMap
var osm = L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {attribution: '© <a >OpenStreetMap</a> contributors'});
// .. White background
var white = L.tileLayer("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAQAAAAEAAQMAAABmvDolAAAAA1BMVEX///+nxBvIAAAAH0lEQVQYGe3BAQ0AAADCIPunfg43YAAAAAAAAAAA5wIhAAAB9aK9BAAAAABJRU5ErkJggg==");
// Overlay layers (TMS)
var lyr1 = L.tileLayer('./tiles/{z}/{x}/{y}.png', {tms: true, maxZoom: 22, opacity: 0.9, attribution: ""});
// Map
var map = L.map('map', {
measureControl: true,
center: [-18.3604868606589, -52.694255477616245],
zoom: 22,
minZoom: 0,
maxZoom: 22,
layers: [osm]
});
lyr1.addTo(map);
//Geojson Layers
var basemaps = {"OpenStreetMap": osm, "Without background": white}
var overlaymaps = {"Layer 1": lyr1}
// Title
var title = L.control();
title.onAdd = function(map) {
this._div = L.DomUtil.create('div', 'ctl title');
this.update();
return this._div;
};
title.update = function(props) {
this._div.innerHTML = "FazMaraneyRGB_transparent_mosaic_group1";
};
title.addTo(map);
// Note
var src = 'Generated by Hawkit';
var title = L.control({position: 'bottomleft'});
title.onAdd = function(map) {
this._div = L.DomUtil.create('div', 'ctl src');
this.update();
return this._div;
};
title.update = function(props) {
this._div.innerHTML = src;
};
title.addTo(map);
var featureGroup = L.featureGroup().addTo(map);
var drawControl = new L.Control.Draw({
edit: {
featureGroup: featureGroup
}
}).addTo(map);
map.on('draw:created', function(e) {
// Each time a feaute is created, it's added to the over arching feature group
featureGroup.addLayer(e.layer);
});
// on click, clear all layers
document.getElementById('delete').onclick = function(e) {
featureGroup.clearLayers();
}
document.getElementById('export').onclick = function(e) {
// Extract GeoJson from featureGroup
var data = featureGroup.toGeoJSON();
// Stringify the GeoJson
var convertedData = 'text/json;charset=utf-8,' + encodeURIComponent(JSON.stringify(data));
// Create export
document.getElementById('export').setAttribute('href', 'data:' + convertedData);
document.getElementById('export').setAttribute('download','data.geojson');
}
// Add base layers
L.control.layers(basemaps, overlaymaps, {collapsed: true}).addTo(map);
// Fit to overlay bounds (SW and NE points with (lat, lon))
map.fitBounds([[-18.36827062251916, -52.6871074784942], [-18.35270287637126, -52.7014028427423]]);
</script>
</body>
</html>
推薦答案
那個彈窗是由瀏覽器生成的，對于QWebEngine我們必須創(chuàng)建它.首先，必須檢測指示下載的信號，該信號是來自QWebEngineProfile 的downloadRequested.該信號向我們發(fā)送一個處理下載的 QWebEngineDownloadItem 對象，在其中我們借助 QFileDialog 創(chuàng)建一個對話窗口.對于這種情況，我們將創(chuàng)建一個自定義的 QWebEnginePage，如下所示:
That popup window is generated by the browser, in the case of QWebEngine we must create it. To start, the signal indicating the download must be detected, and this signal is downloadRequested from the QWebEngineProfile. That signal sends us a QWebEngineDownloadItem object that handles the download, in it we create a dialog window with the help of QFileDialog. For this case we will create a custom QWebEnginePage as shown below:
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name='viewport' content='width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no' />
<title>FazMaraneyRGB_transparent_mosaic_group1</title>
<!-- Leaflet -->
<link rel="stylesheet" />
<script src="http://cdn.leafletjs.com/leaflet-0.7.5/leaflet.js"></script>
<!-- Leaflet.draw -->
<link rel="stylesheet" />
<script src="https://unpkg.com/leaflet-draw@0.4.1/dist/leaflet.draw.js"></script>
<!-- Leaflet Ajax -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet-ajax/2.1.0/leaflet.ajax.min.js"></script>
<!-- Leaflet Measument -->
<link rel="stylesheet" />
<script src="http://ljagis.github.io/leaflet-measure/leaflet-measure.min.js"></script>
<style>
body {
margin: 0;
padding: 0;
}
body,
table,
tr,
td,
th,
div,
h1,
h2,
input {
font-family: "Calibri", "Trebuchet MS", "Ubuntu", Serif;
font-size: 11pt;
}
#map {
position: absolute;
top: 0;
bottom: 0;
width: 100%;
}
/* full size */
.ctl {
padding: 2px 10px 2px 10px;
background: white;
background: rgba(255, 255, 255, 0.9);
box-shadow: 0 0 15px rgba(0, 0, 0, 0.2);
border-radius: 5px;
text-align: right;
}
.title {
font-size: 18pt;
font-weight: bold;
}
.src {
font-size: 10pt;
}
#delete,
#export {
position: absolute;
top: 100px;
right: 10px;
z-index: 100;
background: white;
color: black;
padding: 6px;
border-radius: 4px;
font-family: 'Helvetica Neue';
cursor: pointer;
font-size: 12px;
text-decoration: none;
}
#export {
top: 130px;
}
</style>
</head>
<body>
<div id='map'></div>
<div id='delete'>Delete Features</div>
<a href='#' id='export'>Export Features</a>
<script>
/* **** Leaflet **** */
// Base layers
// .. OpenStreetMap
var osm = L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {
attribution: '© <a >OpenStreetMap</a> contributors'
});
// .. White background
var white = L.tileLayer("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAQAAAAEAAQMAAABmvDolAAAAA1BMVEX///+nxBvIAAAAH0lEQVQYGe3BAQ0AAADCIPunfg43YAAAAAAAAAAA5wIhAAAB9aK9BAAAAABJRU5ErkJggg==");
// Overlay layers (TMS)
var lyr1 = L.tileLayer('./tiles/{z}/{x}/{y}.png', {
tms: true,
maxZoom: 22,
opacity: 0.9,
attribution: ""
});
// Map
var map = L.map('map', {
measureControl: true,
center: [-18.3604868606589, -52.694255477616245],
zoom: 22,
minZoom: 0,
maxZoom: 22,
layers: [osm]
});
lyr1.addTo(map);
//Geojson Layers
var basemaps = {
"OpenStreetMap": osm,
"Without background": white
}
var overlaymaps = {
"Layer 1": lyr1
}
// Title
var title = L.control();
title.onAdd = function(map) {
this._div = L.DomUtil.create('div', 'ctl title');
this.update();
return this._div;
};
title.update = function(props) {
this._div.innerHTML = "FazMaraneyRGB_transparent_mosaic_group1";
};
title.addTo(map);
// Note
var src = 'Generated by Hawkit';
var title = L.control({
position: 'bottomleft'
});
title.onAdd = function(map) {
this._div = L.DomUtil.create('div', 'ctl src');
this.update();
return this._div;
};
title.update = function(props) {
this._div.innerHTML = src;
};
title.addTo(map);
var featureGroup = L.featureGroup().addTo(map);
var drawControl = new L.Control.Draw({
edit: {
featureGroup: featureGroup
}
}).addTo(map);
map.on('draw:created', function(e) {
// Each time a feaute is created, it's added to the over arching feature group
featureGroup.addLayer(e.layer);
});
// on click, clear all layers
document.getElementById('delete').onclick = function(e) {
featureGroup.clearLayers();
}
document.getElementById('export').onclick = function(e) {
// Extract GeoJson from featureGroup
var data = featureGroup.toGeoJSON();
// Stringify the GeoJson
var convertedData = 'text/json;charset=utf-8,' + encodeURIComponent(JSON.stringify(data));
// Create export
document.getElementById('export').setAttribute('href', 'data:' + convertedData);
document.getElementById('export').setAttribute('download', 'data.geojson');
}
// Add base layers
L.control.layers(basemaps, overlaymaps, {
collapsed: true
}).addTo(map);
// Fit to overlay bounds (SW and NE points with (lat, lon))
map.fitBounds([
[-18.36827062251916, -52.6871074784942],
[-18.35270287637126, -52.7014028427423]
]);
</script>
</body>
</html>ma??in.py
from PyQt5 import QtWebEngineWidgets, QtWidgets, QtCore
class WebEnginePage(QtWebEngineWidgets.QWebEnginePage):
def __init__(self, *args, **kwargs):
QtWebEngineWidgets.QWebEnginePage.__init__(self, *args, **kwargs)
self.profile().downloadRequested.connect(self.on_downloadRequested)
@QtCore.pyqtSlot(QtWebEngineWidgets.QWebEngineDownloadItem)
def on_downloadRequested(self, download):
old_path = download.path()
suffix = QtCore.QFileInfo(old_path).suffix()
path, _ = QtWidgets.QFileDialog.getSaveFileName(self.view(), "Save File", old_path, "*."+suffix)
if path:
download.setPath(path)
download.accept()
if __name__ == '__main__':
import sys
sys.argv.append("--remote-debugging-port=8000")
sys.argv.append("--disable-web-security")
app = QtWidgets.QApplication(sys.argv)
view = QtWebEngineWidgets.QWebEngineView()
page = WebEnginePage(view)
view.setPage(page)
path = QtCore.QDir.current().filePath("index.html")
view.load(QtCore.QUrl.fromLocalFile(path))
view.show()
sys.exit(app.exec_())
<小時>
在你的情況下:
In your case:
self.MainWindow.webMapViewer = QtWebEngineWidgets.QWebEngineView()
self.MainWindow.webPageLayout.addWidget(self.MainWindow.webMapViewer)
page = WebEnginePage(self.MainWindow.webMapViewer) # create page
self.MainWindow.webMapViewer.setPage(page) # set page
self.html_path = os.path.split(os.path.abspath(__file__))[0] + r'/html/test.html'
self.MainWindow.webMapViewer.load(QtCore.QUrl().fromLocalFile(self.html_path))
<小時>
加號:
如果要設置已定義的路線，請使用以下命令:
If you want to set a defined route use the following:
@QtCore.pyqtSlot(QtWebEngineWidgets.QWebEngineDownloadItem)
def on_downloadRequested(self, download):
directory = "/path/of/directory"
filename = QtCore.QFileInfo(download.path()).fileName()
download.setPath(QtCore.QDir(directory).filePath(filename))
download.accept()
這篇關于如何使用 QWebEngineView 打開下載文件對話框?的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網(wǎng)！
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