更新MyImage类和MySvgView类，修复在Qt4下无法使用的问题

zccrs · Nov 25, 2014 · 8287cee · 8287cee
1 parent a2678f9
commit 8287cee
Show file tree

Hide file tree

Showing 4 changed files with 193 additions and 34 deletions.
diff --git a/src/mywidgets/myimage.cpp b/src/mywidgets/myimage.cpp
@@ -1,7 +1,9 @@
 #include "myimage.h"
 #include <QPainter>
 #include <QBitmap>
+#include <QDir>
 #include <QDebug>
+#include <QPixmapCache>
 
 #if(QT_VERSION>=0x050000)
 MyImage::MyImage(QQuickItem *parent) :
@@ -11,10 +13,14 @@ MyImage::MyImage(QDeclarativeItem *parent) :
     QDeclarativeItem(parent)
 #endif
 {
+#if(QT_VERSION<0x050000)
+    setFlag(QGraphicsItem::ItemHasNoContents, false);
+#endif
+    m_status = Null;
     m_cache = true;
     m_grayscale = false;
+    connect(&manager, SIGNAL(finished(QNetworkReply*)), SLOT(onDownImageFinished(QNetworkReply*)));
 
-    pixmap = new QPixmap;
     bitmap = new QBitmap;
     connect (this, SIGNAL(widthChanged()), SLOT(onWidthChanged()));
     connect (this, SIGNAL(heightChanged()), SLOT(onHeightChanged()));
@@ -56,46 +62,123 @@ QImage MyImage::chromaticToGrayscale(const QImage &image)
     return iGray;
 }
 
+QString MyImage::imageFormatToString(const QByteArray &array)
+{
+    QByteArray str = array.toHex ();
+
+        if(str.mid (2,6)=="504e47")
+            return "png";
+        if(str.mid (12,8)=="4a464946")
+            return "jpg";
+        if(str.left (6)=="474946")
+            return "gif";
+        if(str.left (4)=="424d")
+            return "bmp";
+        return "";
+}
+
+void MyImage::downloadImage(const QUrl &url)
+{
+    setStatus(Loading);
+
+    if(reply!=NULL){
+        reply->abort();
+        //先结束上次的网络请求
+    }
+
+    QNetworkRequest request;
+    request.setUrl(url);
+    reply = manager.get(request);
+}
+
+void MyImage::setPixmap(QImage image)
+{
+    if(image.isNull())
+        return;
+
+    if(m_cache){//如果缓存图片
+        QPixmapCache::insert(m_source.toString(), QPixmap::fromImage(image));
+    }
+
+    if(m_grayscale){//如果为黑白
+        image = chromaticToGrayscale(image);//转换为黑白图
+    }
+    pixmap = QPixmap::fromImage (image);
+
+    if(m_maskSource.toString()!=""&&(!bitmap->isNull())){
+        int max_width = bitmap->width();
+        int max_height = bitmap->height();
+        max_width = pixmap.width()>max_width?pixmap.width():max_width;
+        max_height = pixmap.height()>max_height?pixmap.height():max_height;
+
+        pixmap = pixmap.scaled(max_width, max_height);
+        pixmap.setMask (bitmap->scaled(max_width, max_height));
+    }
+
+    setImplicitWidth(pixmap.size().width());//设置默认大小
+    setImplicitHeight(pixmap.size().height());
+
+    if( width()>0 )
+        onWidthChanged();
+    if(height ()>0)
+        onHeightChanged();
+
+    update();
+}
+
 void MyImage::onWidthChanged()
 {
-    setImplicitHeight (pixmap->size ().height ()*(width ()/pixmap->size ().width ()));
+    setImplicitHeight (pixmap.size ().height ()*(width ()/pixmap.size ().width ()));
 }
 
 void MyImage::onHeightChanged()
 {
-    setImplicitWidth (pixmap->size ().width ()*(height ()/pixmap->size ().height ()));
+    setImplicitWidth (pixmap.size ().width ()*(height ()/pixmap.size ().height ()));
 }
+
+void MyImage::onDownImageFinished(QNetworkReply *reply)
+{
+    if(reply->error() == QNetworkReply::NoError){
+        qDebug()<<QString::fromUtf8("MyImage:图片下载成功");
+
+        QImage image;
+        if( !image.loadFromData(reply->readAll())){
+            emit loadError ();
+            setStatus(Error);
+            qDebug()<<QString::fromUtf8("MyImage:图片加载出错");
+            return;
+        }
+
+        setPixmap(image);
+        setStatus(Ready);
+    }else{
+        setStatus(Error);
+        emit loadError();
+    }
+}
+
+#if(QT_VERSION>=0x050000)
 void MyImage::paint(QPainter *painter)
+#else
+void MyImage::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
+#endif
 {
-    painter->drawPixmap (0,0,pixmap->scaled (width(), height (), Qt::IgnoreAspectRatio, Qt::SmoothTransformation));
+    painter->drawPixmap (0,0,pixmap.scaled(width(), height(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation));
+}
+
+MyImage::State MyImage::status() const
+{
+    return m_status;
 }
 
 void MyImage::setSource(QUrl arg)
 {
     if (!m_cache||m_source != arg) {
+        setStatus(Loading);
+
         m_source = arg;
-        QString str;
-        str = arg.toString ();
-        if( str.mid (0, 3) == "qrc")
-            str = str.mid (3, str.count ()-3);
-        QImage image;
-        if( image.load (str)){
-            if(m_grayscale){//如果为黑白
-                image = chromaticToGrayscale(image);//转换为黑白图
-            }
-            *pixmap = QPixmap::fromImage (image);
-            pixmap->setMask (bitmap->scaled (pixmap->size ()));
-            setImplicitWidth(pixmap->size().width());//设置默认大小
-            setImplicitHeight(pixmap->size().height());
-
-            if( width()>0 )
-                onWidthChanged();
-            if(height ()>0)
-                onHeightChanged();
-            update ();
-        }else{
-            emit loadError ();
-        }
+        reLoad();
+        //加载图片
         if(m_source != arg)
             emit sourceChanged(arg);
     }
@@ -109,6 +192,7 @@ void MyImage::setMaskSource(QUrl arg)
         if( str.mid (0, 3) == "qrc")
             str = str.mid (3, str.count ()-3);
         bitmap->load (str);
+        reLoad();
         emit maskSourceChanged(arg);
     }
 }
@@ -125,10 +209,44 @@ void MyImage::setGrayscale(bool arg)
 {
     if(m_grayscale!=arg){
         m_grayscale = arg;
-        bool old_cache = cache ();
-        m_cache = false;
-        setSource (source ());
-        m_cache = old_cache;
+        reLoad();
         emit grayscaleChanged(arg);
     }
 }
+
+void MyImage::setStatus(MyImage::State arg)
+{
+    if (m_status != arg) {
+        m_status = arg;
+        emit statusChanged(arg);
+    }
+}
+
+void MyImage::reLoad()
+{
+    QString str = m_source.toString();
+
+    QPixmap *temp_pximap = QPixmapCache::find(str);
+    if(temp_pximap!=NULL){//如果缓存区已经有图片
+        setPixmap(temp_pximap->toImage());
+        setStatus(Ready);
+        return;
+    }
+
+    if(str.indexOf("http")==0){//如果是网络图片
+        downloadImage(m_source);
+        return;
+    }
+
+    if( str.mid (0, 3) == "qrc")
+        str = str.mid (3, str.count ()-3);
+
+    QImage image;
+    if( !image.load (str)){
+        emit loadError ();
+        setStatus(Error);
+        return;
+    }
+
+    setPixmap(image);
+}
diff --git a/src/mywidgets/myimage.h b/src/mywidgets/myimage.h
@@ -4,6 +4,7 @@
 #include <QImage>
 #include <QPixmap>
 #include <QBitmap>
+#include <QtNetwork>
 
 #if(QT_VERSION>=0x050000)
 #include <QQuickPaintedItem>
@@ -22,7 +23,17 @@ class MyImage : public QDeclarativeItem
     Q_PROPERTY(QUrl maskSource READ maskSource WRITE setMaskSource NOTIFY maskSourceChanged)
     Q_PROPERTY(bool cache READ cache WRITE setCache NOTIFY cacheChanged)
     Q_PROPERTY(bool grayscale READ grayscale WRITE setGrayscale NOTIFY grayscaleChanged)
+    Q_PROPERTY(State status READ status NOTIFY statusChanged FINAL)
+
+    Q_ENUMS(State)
 public:
+    enum State{
+        Null,
+        Ready,
+        Loading,
+        Error
+    };
+
 #if(QT_VERSION>=0x050000)
     explicit MyImage(QQuickItem *parent = 0);
 #else
@@ -35,30 +46,50 @@ class MyImage : public QDeclarativeItem
     bool grayscale() const;
 
     QImage chromaticToGrayscale(const QImage &image);
+
+    static QString imageFormatToString(const QByteArray& array);
+
+#if(QT_VERSION>=0x050000)
+    void paint(QPainter * painter);
+#else
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *new_style, QWidget *new_widget=0);
+#endif
+    State status() const;
+
 private:
     QUrl m_source;
-    QPixmap *pixmap;
+    QPixmap pixmap;
     QBitmap *bitmap;
     QUrl m_maskSource;
     bool m_cache;
     bool m_grayscale;
+    QNetworkAccessManager manager;
+    QNetworkReply *reply;
+
+    void downloadImage(const QUrl& url);
+    void setPixmap(QImage image);
+    State m_status;
 
-protected:
-    void paint(QPainter * painter);
 signals:
     void sourceChanged(QUrl arg);
     void maskSourceChanged(QUrl arg);
     void loadError();//加载图片出错
     void cacheChanged(bool arg);
     void grayscaleChanged(bool arg);
+    void statusChanged(State arg);
+
 private slots:
     void onWidthChanged();
     void onHeightChanged();
+    void onDownImageFinished(QNetworkReply* reply);
 public slots:
     void setSource(QUrl arg);
     void setMaskSource(QUrl arg);
     void setCache(bool arg);
     void setGrayscale(bool arg);
+    void setStatus(State arg);
+
+    void reLoad();
 };
 
 #endif // MYIMAGE_H
diff --git a/src/mywidgets/mysvgview.cpp b/src/mywidgets/mysvgview.cpp
@@ -11,6 +11,9 @@ MySvgView::MySvgView(QDeclarativeItem *parent) :
     QDeclarativeItem(parent)
 #endif
 {
+#if(QT_VERSION<0x050000)
+    setFlag(QGraphicsItem::ItemHasNoContents, false);
+#endif
     m_defaultSize = QSize(0,0);
     svg = new QSvgRenderer(this);
     connect (this, SIGNAL(widthChanged()), SLOT(onWidthChanged()));
@@ -45,7 +48,11 @@ void MySvgView::onHeightChanged()
     setImplicitWidth (svg->defaultSize ().width ()*(height ()/svg->defaultSize ().height ()));
 }
 
+#if(QT_VERSION>=0x050000)
 void MySvgView::paint(QPainter *painter)
+#else
+void MySvgView::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
+#endif
 {
     svg->render (painter);
 }

diff --git a/src/mywidgets/mysvgview.h b/src/mywidgets/mysvgview.h
@@ -36,8 +36,11 @@ private slots:
     void onWidthChanged();
     void onHeightChanged();
 protected:
+#if(QT_VERSION>=0x050000)
     void paint(QPainter * painter);
-    //QSGNode *updatePaintNode(QSGNode * oldNode, UpdatePaintNodeData * updatePaintNodeData);
+#else
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *new_style, QWidget *new_widget=0);
+#endif
 signals:
     void sourceChanged(QUrl arg);
     void rotationModeChanged(Qt::Axis arg);