我想做Web引擎视图 http://doc.qt.io/qt-5/qml-qtwebengine-webengineview.html也可以轻弹。我决定,最好使用可轻弹 http://doc.qt.io/qt-5/qml-qtquick-flickable.html。但做出这样的事情的天真方法:
...
Flickable {
WebEngineView {...}
}
...
不管用。
进一步的调查使我发现用于嵌入式触摸设备的基于 Qt 的 Web 浏览器 http://code.qt.io/cgit/qt-apps/qtwebbrowser.git/。我已经在我的电脑上尝试过了。看起来它正在做我想要的事情,但它太复杂了,而且 GPL 许可证使其无法用于任何用途。
经过一些实验,我发现轻拂会起作用,如果Flickable.contentHeight http://doc.qt.io/qt-5/qml-qtquick-flickable.html#contentHeight-prop and Flickable.contentWidth http://doc.qt.io/qt-5/qml-qtquick-flickable.html#contentWidth-prop至少匹配 WebEngineView 显示的网页的实际大小。 Flickable 的这些属性可能具有比实际页面大小更大的值。在这种情况下,您将能够轻拂页面内容之外的内容。如果 Flickable.contentHeight 和/或 Flickable.contentWidth 小于页面大小,您仍然可以轻拂。这取决于你是否想要这样)
因此它最终获取显示的实际页面大小并将其设置为 Flickable.contentHeight 和 Flickable.contentWidth。我在这里给你一个小故事:没有办法使用 WebEngineView API 获取所需的值(或者至少我在 Qt 5.7/5.8 文档中没有找到任何内容)。但我无意中发现这个答案关于SO https://stackoverflow.com/questions/26278858/how-to-get-the-contentsize-of-a-web-page-in-qt5-4-qtwebengine。使用这个答案,我成功地使一切正常工作:
...
Item {
Layout.fillHeight: true
Layout.fillWidth: true
Flickable {
id: flick
anchors.fill: parent
WebEngineView {
anchors.fill: parent
id: webView
}
}
webView.onLoadingChanged: {
if (webView.loadProgress == 100) {
webView.runJavaScript(
"document.documentElement.scrollHeight;",
function (i_actualPageHeight) {
flick.contentHeight = Math.max (
i_actualPageHeight, flick.height);
})
webView.runJavaScript(
"document.documentElement.scrollWidth;",
function (i_actualPageWidth) {
flick.contentWidth = Math.max (
i_actualPageWidth, flick.width);
})
}
}
}
...
上面的代码片段可能需要一些调整,但这几乎是我可用的代码的副本。
UPD 1:我发现这不是最终的解决方案,因为由于某种原因,加载新页面后 document.documentElement.scrollWidth 可能不会重置并保持与上一页相同。
UPD 2:我已经解决了上述问题,但解决方案有点难看:将WebEngineView.onLoadingChanged中的Flickable.contentWidth重置为Flickable.width。将 Flickable.contentWidth 设置为 0 将导致加载后内容的高度过大。
我所做的另一项调整是取消了 100% 加载状态的要求。
UPD 3:可滑动 WebEngiveView 的更完整版本。使用用户脚本而不是直接调用 JavaScript,因为我在后者中遇到了一些奇怪的错误,导致 WebEngineView 关闭。
// Copyright 2019 Utility Tool Kit Open Source Contributors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
//
// Author: Innokentiy Alaytsev <[email protected] /cdn-cgi/l/email-protection>
//
// File name: qml/Utk/Qml/FlickableWebEngineView.qml
//
// Description: The QML FlickableWebEngineView QtQuick 2 component.
import QtQuick 2.7
import QtWebEngine 1.3
Item {
property alias flickable: flickable;
property alias webView: webView;
property bool userDragImgEnabled: true;
property bool userSelectEnabled: true;
readonly property string kDisableUserDragCssId:
"utk_qml_flickable_web_engine_view_disable_user_drag_css";
readonly property string kDisableUserSelectCssId:
"utk_qml_flickable_web_engine_view_disable_user_select_css";
readonly property string kDisableUserDragCss:
"{ \\ \
-webkit-user-drag: none; \\ \
-khtml-user-drag: none; \\ \
-moz-user-drag: none; \\ \
-ms-user-drag: none; \\ \
user-drag: none; \\ \
}";
readonly property string kDisableUserSelectCss:
"{ \\ \
-webkit-touch-callout: none; \\ \
-webkit-user-select: none; \\ \
-khtml-user-select: none; \\ \
-moz-user-select: none; \\ \
-ms-user-select: none; \\ \
user-select: none; \\ \
}";
WebEngineScript {
id: disableUserDragScript;
name: kDisableUserDragCssId;
injectionPoint: WebEngineScript.DocumentReady;
sourceCode: applyCssJavaScript ("img", kDisableUserDragCss, kDisableUserDragCssId);
worldId: WebEngineScript.MainWorld;
}
WebEngineScript {
id: disableUserSelectScript;
name: kDisableUserSelectCssId;
injectionPoint: WebEngineScript.DocumentReady;
sourceCode: applyCssJavaScript ("body", kDisableUserSelectCss, kDisableUserSelectCssId);
worldId: WebEngineScript.MainWorld;
}
Flickable {
id: flickable;
anchors.fill : parent;
clip: true;
WebEngineView {
id: webView;
anchors.fill : parent;
scale: 1;
onLoadingChanged: {
if (loadRequest.status !== WebEngineView.LoadSucceededStatus) {
return;
}
flickable.contentHeight = 0;
flickable.contentWidth = flickable.width;
runJavaScript (
"document.documentElement.scrollHeight;",
function (actualPageHeight) {
flickable.contentHeight = Math.max (
actualPageHeight, flickable.height);
});
runJavaScript (
"document.documentElement.scrollWidth;",
function (actualPageWidth) {
flickable.contentWidth = Math.max (
actualPageWidth, flickable.width);
});
}
}
}
onUserDragImgEnabledChanged: {
if (userDragImgEnabled &&
(webView.loadRequest.status === WebEngineView.LoadSucceededStatus)) {
runJavaScript (revertCssJavaScript (kDisableUserDragCssId));
}
else {
webView.userScripts = currentUserScripts ();
}
}
onUserSelectEnabledChanged: {
if (userSelectEnabled &&
(webView.loadRequest.status === WebEngineView.LoadSucceededStatus)) {
runJavaScript (revertCssJavaScript (kDisableUserSelectCssId));
}
else {
webView.userScripts = currentUserScripts ();
}
}
function currentUserScripts () {
var userScriptsToSkip = [
disableUserDragScript.name,
disableUserSelectScript.name
];
var updatedUserScripts = [];
for (var i in webView.userScripts) {
var script = webView.userScripts[ i ];
if (-1 == userScriptsToSkip.indexOf (script.name)) {
updatedUserScripts.push (script);
}
}
if (!userDragImgEnabled) {
updatedUserScripts.push (disableUserDragScript);
}
if (!userSelectEnabled) {
updatedUserScripts.push (disableUserSelectScript);
}
return updatedUserScripts;
}
function applyCssJavaScript (selector, css, cssId) {
var applyCssJavaScript =
"(function () { \
cssElement = document.createElement ('style'); \
\
head = document.head || \
document.getElementsByTagName ('head')[ 0 ]; \
\
head.appendChild (cssElement); \
\
cssElement.type = 'text/css'; \
cssElement.id = '%1'; \
\
if (cssElement.styleSheet) \
{ \
cssElement.styleSheet.cssText = '%2 %3'; \
} \
else \
{ \
cssElement.appendChild ( \
document.createTextNode ('%2 %3')); \
} \
})();";
return applyCssJavaScript
.arg (cssId)
.arg (selector)
.arg (css);
}
function revertCssJavaScript (cssId) {
var revertCssJavaScript =
"(function () { \
var element = document.getElementById('%1'); \
\
if (element) { \
element.outerHTML = ''; \
\
delete element; \
} \
})()";
return revertCssJavaScript.arg (cssId);
}
}