我希望界面中出现的图像和文本呈现为PDF。我有一个按钮,当触发该按钮时,它将界面中显示的所有内容保存为 PDF(如导出为 PDF)。为此,我查看了资源和论坛中打开的主题,但无法得出明确的结果。如果您能对此提供帮助,我将非常高兴。
您应该在
PrintSupport
文件中启用 .pro
模块,如 QT+=PrintSupport
首先像这样声明Drawer类:
#pragma once
#include <QQmlApplicationEngine>
class PdfExporter : public QQmlApplicationEngine
{
Q_OBJECT
public:
PdfExporter(QQmlApplicationEngine * engine);
Q_INVOKABLE void screenShot();
private:
QQmlApplicationEngine * mEngine;
};
并定义:
#include <Drawer.h>
#include <QQuickWindow>
#include <QPrinter>
#include <QPainter>
PdfExporter::PdfExporter(QQmlApplicationEngine *engine) : QQmlApplicationEngine(engine), mEngine(engine)
{
}
void PdfExporter::screenShot()
{
foreach(QObject* obj, mEngine->rootObjects()) {
QQuickWindow* window = qobject_cast<QQuickWindow*>(obj);
if (window)
{
QImage windowImage = window->grabWindow();
QPrinter pdfPrinter(QPrinter::HighResolution);
pdfPrinter.setOutputFormat(QPrinter::PdfFormat);
pdfPrinter.setOutputFileName("test.pdf");
QPainter painter;
painter.begin(&pdfPrinter);
painter.drawImage(QRect(0,0,windowImage.width(),windowImage.height()),windowImage,{0,0,windowImage.width(),windowImage.height()});
painter.end();
}
}
}
在
main.cpp
中,我更喜欢将 C++ 类作为上下文属性导出到引擎。
PdfExporter * dr = new PdfExporter(&engine);
engine.rootContext()->setContextProperty("drawer",dr);
在 QML 中,您可以触发如下功能:
import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.12
import QtQuick.Layouts 1.12
Window {
width: 640
height: 480
visible: true
title: qsTr("Hello World")
ColumnLayout
{
anchors.centerIn: parent
Rectangle
{
Layout.preferredWidth: 200
Layout.preferredHeight: 100
color: "red"
}
Button
{
Layout.preferredWidth: 100
Layout.preferredHeight: 20
Layout.alignment: Qt.AlignHCenter
text: "test"
onClicked: drawer.screenShot()
}
}
}
我正在寻找这个用例,您可以与我分享工作代码吗?