From 7766ac212045e1df2a7154947ff35257f367e768 Mon Sep 17 00:00:00 2001
From: Gokul Kartha <everyourgokul@gmail.com>
Date: Wed, 17 Nov 2010 22:14:32 +0200
Subject: [PATCH] Added an ImageLoader Object to Support Multi Threading in
 Loading an Image The ImageLoader Object is associated with
 the workspace

---
 src/app/app.pro               |    2 +-
 src/core/baseui/workspace.cpp |   27 +++++++++++++++++++++++++--
 src/core/baseui/workspace.h   |   21 ++++++++++++++++++---
 3 files changed, 44 insertions(+), 6 deletions(-)

diff --git a/src/app/app.pro b/src/app/app.pro
index 5321cec..3835bdd 100644
--- a/src/app/app.pro
+++ b/src/app/app.pro
@@ -1,2 +1,2 @@
 TEMPLATE = subdirs
-SUBDIRS =  x11
+SUBDIRS =  viewer x11
diff --git a/src/core/baseui/workspace.cpp b/src/core/baseui/workspace.cpp
index 673555e..b77feef 100644
--- a/src/core/baseui/workspace.cpp
+++ b/src/core/baseui/workspace.cpp
@@ -1,14 +1,37 @@
 #include "workspace.h"
 #include <QPainter>
+ImageLoader::ImageLoader()
+{
+    url=QString();
+}
+void ImageLoader::fetchImage(QString path)
+{
+    url=path;
+    start();
+}
+void ImageLoader::run()
+{
+    QImage image(url);
+    emit ready(image);
+}
+
 Workspace::Workspace(QWidget *parent) :
     QWidget(parent)
 {
-    loadImage("/home/shakir/Desktop/Test/test1.jpg");
+    qRegisterMetaType<QImage>("QImage &" );
+    mImageLoader=new ImageLoader();
+    connect(mImageLoader,SIGNAL(ready(QImage&)),this,SLOT(onImageLoaded(QImage&)));
 }
 void  Workspace::loadImage(QString fileName)
 {
-    mImage=QImage(fileName);
+   mImageLoader->fetchImage(fileName);
 }
+void Workspace::onImageLoaded(QImage &image)
+{
+     mImage=image.copy();
+     update();
+}
+
 void  Workspace::zoomIn()
 {
     mImage=mImage.scaledToHeight(mImage.height()*1.5);
diff --git a/src/core/baseui/workspace.h b/src/core/baseui/workspace.h
index 8835af4..a7f669b 100644
--- a/src/core/baseui/workspace.h
+++ b/src/core/baseui/workspace.h
@@ -2,6 +2,21 @@
 #define WORKSPACE_H
 
 #include <QWidget>
+#include <QThread>
+
+class ImageLoader:public QThread
+{
+    Q_OBJECT
+public:
+    ImageLoader();
+    void fetchImage(QString path);
+private:
+    void run();
+signals:
+    void ready(QImage&);
+private:
+    QString url;
+};
 
 class Workspace : public QWidget
 {
@@ -12,14 +27,14 @@ public:
     virtual void paintEvent(QPaintEvent *);
 signals:
 
-
 public slots:
     void zoomIn();
     void zoomOut();
-
+private slots:
+    void onImageLoaded(QImage&);
 private:
     QImage mImage;
-
+    ImageLoader *mImageLoader;
 };
 
 #endif // WORKSPACE_H
-- 
1.7.9.5