Add picture viewer

Opens on doubleclick when it's image/*.

1 files changed, 79 insertions, 0 deletions

diff --git a/viewer.cpp b/viewer.cpp
new file mode 100644
index 0000000..e8d5f7f
--- /dev/null
+++ b/viewer.cpp
@@ -0,0 +1,79 @@
+#include <QLabel>
+#include <QHBoxLayout>
+#include <QDesktopWidget>
+#include <QApplication>
+#include <QFileInfo>
+#include <QMimeDatabase>
+#include <QDir>
+#include <QWheelEvent>
+
+#include "viewer.h"
+
+Viewer::Viewer(QWidget *parent, Qt::WindowFlags f) : QWidget(parent, f), mCurIndex(-1) {
+    QDesktopWidget *dw = qApp->desktop();
+    mLabel = new QLabel;
+    mLabel->setMaximumSize(dw->size() - QSize(20, 20));
+    QHBoxLayout *mainLayout = new QHBoxLayout;
+    mainLayout->addWidget(mLabel);
+    setLayout(mainLayout);
+}
+
+void Viewer::setFile(const QString &file, bool allFiles){
+    mCurIndex = -1;
+    QFileInfo fi(file);
+    QMimeDatabase db;
+    QMimeType mt = db.mimeTypeForFile(fi);
+    if(mt.name().startsWith("image")){
+        mFiles << fi.absoluteFilePath();
+    }
+    if(allFiles){
+        foreach(auto curFi, fi.dir().entryInfoList()){
+            if(!mFiles.contains(curFi.absoluteFilePath())){
+                QMimeType mt = db.mimeTypeForFile(curFi);
+                if(mt.name().startsWith("image")){
+                    mFiles << curFi.absoluteFilePath();
+                }
+            }
+        }
+    }
+    if(!mFiles.isEmpty()){
+        mCurIndex = 0;
+        displayFile(mCurIndex);
+    }
+}
+
+void Viewer::wheelEvent(QWheelEvent *event){
+    QPoint numDeg = event->angleDelta() / 8;
+    if(numDeg.y() < 0){ //this is scrolling down -> next!
+        if(mCurIndex + 1 >= mFiles.count()){
+            mCurIndex = 0;
+        }else{
+            ++mCurIndex;
+        }
+    }else if(numDeg.y() > 0){
+        if(mCurIndex - 1 < 0){
+            mCurIndex = mFiles.count() - 1;
+        }else{
+            --mCurIndex;
+        }
+    }
+    displayFile(mCurIndex);
+    event->accept();
+}
+
+void Viewer::displayFile(int index){
+    if(index < 0){
+        return;
+    }
+    QPixmap pm(mFiles.at(mCurIndex));
+    if(pm.width() > mLabel->maximumWidth()){
+        pm = pm.scaledToWidth(mLabel->maximumWidth());
+    }
+    if(pm.height() > mLabel->maximumHeight()){
+        pm = pm.scaledToHeight(mLabel->maximumHeight());
+    }
+    mLabel->setPixmap(pm);
+    adjustSize();
+    QString winTitle = QString(tr("%1 Viewer [%2]")).arg(qApp->applicationName()).arg(mFiles.at(mCurIndex));
+    setWindowTitle(winTitle);
+}