V6.7.4 release

scene/PicSceneLoader.cpp

@@ -9,12 +9,16 @@
 
 #include <QFile>
 #include <QXmlStreamReader>
+#include <QXmlStreamWriter>
 #include <QXmlStreamAttributes>
 #include <QDebug>
 #include <QImage>
 #include <QPainter>
 #include <QScopedPointer>
 #include <cmath>
+#include <unistd.h>
+
+#include "../Printsetting.h"
 
 namespace {
 
@@ -99,6 +103,7 @@ bool parseVbFileElement(QXmlStreamReader& reader, PicScene* scene)
     SourceType sourceType = sourceTypeFromAttrs(itemAttrs);
     PicTextItem* item = createSceneItem(sourceType);
     if (!item) {
+        // 单个图元损坏不应影响整个文件的其余内容加载。
         qWarning() << "PicSceneLoader: skip invalid VBfile item";
         return true;
     }
@@ -121,26 +126,36 @@ bool parseVbFileElement(QXmlStreamReader& reader, PicScene* scene)
 
 namespace PicSceneLoader {
 
-PicScene* createSceneFromFile(const QString& xmlFilename)
+bool loadSceneFromFile(const QString& xmlFilename, PicScene* targetScene, PrintSettingModel* outPrintSettings)
 {
+    if (!targetScene) {
+        qWarning() << "PicSceneLoader: targetScene is null";
+        return false;
+    }
+
     QFile file(xmlFilename);
     if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
         qWarning() << "PicSceneLoader: failed to open" << xmlFilename << file.errorString();
-        return nullptr;
+        return false;
     }
 
     QXmlStreamReader reader(&file);
-    PicScene* scene = new PicScene();
+    PrintSettingModel printSettings;
+
+    // Widget 对 scene 持有长期信号和 view 绑定，因此加载时必须复用现有 scene。
+    targetScene->clear();
 
     while (!reader.atEnd()) {
         reader.readNext();
         if (reader.isStartElement() && reader.name() == "VBfiles") {
             while (reader.readNextStartElement()) {
                 if (reader.name() == "VBfile") {
-                    if (!parseVbFileElement(reader, scene)) {
-                        delete scene;
-                        return nullptr;
+                    if (!parseVbFileElement(reader, targetScene)) {
+                        return false;
                     }
+                } else if (reader.name() == "PrintSettings") {
+                    PrintSettingModel::loadFromXml(printSettings, reader.attributes());
+                    reader.skipCurrentElement();
                 } else {
                     reader.skipCurrentElement();
                 }
@@ -151,17 +166,21 @@ PicScene* createSceneFromFile(const QString& xmlFilename)
     if (reader.hasError()) {
         qWarning() << "PicSceneLoader: XML parse error" << reader.errorString()
                    << "at" << reader.lineNumber() << ":" << reader.columnNumber();
-        delete scene;
-        return nullptr;
+        return false;
     }
 
-    return scene;
+    if (outPrintSettings) {
+        *outPrintSettings = printSettings;
+    }
+
+    return true;
 }
 
 QImage previewSceneFromFile(const QString &xmlFilename)
 {
-    QScopedPointer<PicScene> scene(createSceneFromFile(xmlFilename));
-    if (!scene) {
+    // 预览刻意复用与正常打开相同的加载路径，避免两套逻辑逐渐产生偏差。
+    QScopedPointer<PicScene> scene(new PicScene());
+    if (!loadSceneFromFile(xmlFilename, scene.data(), nullptr)) {
         return QImage();
     }
 
@@ -179,10 +198,68 @@ QImage previewSceneFromFile(const QString &xmlFilename)
     painter.setRenderHint(QPainter::Antialiasing, true);
     painter.setRenderHint(QPainter::SmoothPixmapTransform, true);
 
+    // 以 itemsBoundingRect 作为渲染源区域，预览图会裁剪到实际内容，而不是整个 sceneRect。
     scene->render(&painter, QRectF(QPointF(0, 0), imageSize), contentRect);
     painter.end();
 
     return image;
 }
 
-} // namespace PicSceneLoader
+bool saveSceneToXmlFile(const QString &xmlFilename, PicScene *scene, const PrintSettingModel *printSettings)
+{
+    if (!scene)
+        return false;
+
+    QFile file(xmlFilename);
+    if (!file.open(QFile::WriteOnly | QFile::Text)) {
+        qDebug() << QString("Cannot write file %1(%2).").arg(xmlFilename).arg(file.errorString());
+        return false;
+    }
+    QXmlStreamWriter writer(&file);
+    writer.setAutoFormatting(true);
+    writer.writeStartDocument("1.0", true);
+    writer.writeComment(QString::fromLocal8Bit("Vernon Bach graphic scene file"));
+    writer.writeDTD(QString::fromLocal8Bit("<!DOCTYPE VBfiles	[ <!ELEMENT VBfiles (VBfile) > <!ELEMENT VBfile (pointer_x,pointer_y,html_src)> <!ELEMENT pointer_x     (#PCDATA)><!ELEMENT pointer_y     (#PCDATA)><!ELEMENT html_src     (#PCDATA)> ]>"));
+    writer.writeStartElement("VBfiles");
+    writer.writeAttribute("Version", "1.0");
+
+    QList<QGraphicsItem *> items = scene->items();
+    foreach (QGraphicsItem *item, items) {
+        PicTextItem *picText = qgraphicsitem_cast<PicTextItem*>(item);
+        if (picText == nullptr)
+            continue;
+
+        writer.writeStartElement("VBfile");
+        writer.writeTextElement(QString::fromLocal8Bit("pointer_x"), QString::fromLocal8Bit("%1").arg(picText->pos().x()));
+        writer.writeTextElement(QString::fromLocal8Bit("pointer_y"), QString::fromLocal8Bit("%1").arg(picText->pos().y()));
+        writer.writeTextElement(QString::fromLocal8Bit("Condition"), QString::fromLocal8Bit("%1").arg(picText->SpecialConditions ? 1 : 0));
+        writer.writeTextElement(QString::fromLocal8Bit("CatchStartValue"), QString::fromLocal8Bit("%1").arg(picText->CatchCnt1StartValue));
+        writer.writeTextElement(QString::fromLocal8Bit("CatchValue"), QString::fromLocal8Bit("%1").arg(picText->CatchCnt1CurrValue));
+
+        QXmlStreamAttributes attrs;
+        attrs.append("sourceType", QString::number(picText->sourceType()));
+        if (picText->sourceType() != SourceType::UNKNOWN) {
+            picText->saveAttrs(attrs);
+        }
+        writer.writeStartElement("itemAttrs");
+        writer.writeAttributes(attrs);
+        writer.writeEndElement();
+
+        writer.writeTextElement(QString::fromLocal8Bit("html_src"), QString::fromLocal8Bit("my_src"));
+        writer.writeCDATA(picText->toHtml());
+        writer.writeEndElement();
+    }
+
+    if (printSettings) {
+        writer.writeEmptyElement("PrintSettings");
+        PrintSettingModel::saveToXml(*printSettings, writer);
+    }
+
+    writer.writeEndElement();
+    writer.writeEndDocument();
+    fsync(file.handle());
+    file.close();
+    return true;
+}
+
+} // namespace PicSceneLoader