support commandline arguments (passing file list only)

graphicsscene.cpp

@@ -50,7 +50,7 @@ void GraphicsScene::showGif(const QString &filepath)
     this->clear();
     QMovie * movie = new QMovie(filepath);
     QLabel * label = new QLabel;
-    label->setStyleSheet("background-color:white;");
+    label->setStyleSheet("background-color:rgba(225,255,255,0);");
     label->setMovie(movie);
     this->addWidget(label);
     movie->start();

graphicsview.cpp

@@ -21,6 +21,31 @@ GraphicsView::GraphicsView(QWidget *parent)
     setCheckerboardEnabled(false);
 }
 
+void GraphicsView::showFromUrlList(const QList<QUrl> &urlList)
+{
+    if (urlList.isEmpty()) {
+        // yeah, it's possible. dragging QQ's original sticker will trigger this, for example.
+        showText("File url list is empty");
+        return;
+    }
+    QUrl url(urlList.first());
+    QString filePath(url.toLocalFile());
+
+    if (filePath.endsWith(".svg")) {
+        showSvg(filePath);
+    } else if (filePath.endsWith(".gif")) {
+        showGif(filePath);
+    } else {
+        QImageReader imageReader(filePath);
+        QImage::Format imageFormat = imageReader.imageFormat();
+        if (imageFormat == QImage::Format_Invalid) {
+            showText("File is not a valid image");
+        } else {
+            showImage(QPixmap::fromImageReader(&imageReader));
+        }
+    }
+}
+
 void GraphicsView::showImage(const QPixmap &pixmap)
 {
     resetTransform();
@@ -147,27 +172,7 @@ void GraphicsView::dropEvent(QDropEvent *event)
     const QMimeData * mimeData = event->mimeData();
 
     if (mimeData->hasUrls()) {
-        if (mimeData->urls().isEmpty()) {
+        showFromUrlList(mimeData->urls());
-            // yeah, it's possible. dragging QQ's original sticker will trigger this, for example.
-            showText("File url list is empty");
-            return;
-        }
-        QUrl url(mimeData->urls().first());
-        QString filePath(url.toLocalFile());
-
-        if (filePath.endsWith(".svg")) {
-            showSvg(filePath);
-        } else if (filePath.endsWith(".gif")) {
-            showGif(filePath);
-        } else {
-            QImageReader imageReader(filePath);
-            QImage::Format imageFormat = imageReader.imageFormat();
-            if (imageFormat == QImage::Format_Invalid) {
-                showText("File is not a valid image");
-            } else {
-                showImage(QPixmap::fromImageReader(&imageReader));
-            }
-        }
     } else if (mimeData->hasImage()) {
         QImage img = qvariant_cast<QImage>(mimeData->imageData());
         QPixmap pixmap = QPixmap::fromImage(img);

graphicsview.h

@@ -2,6 +2,7 @@
 #define GRAPHICSVIEW_H
 
 #include <QGraphicsView>
+#include <QUrl>
 
 class GraphicsScene;
 class GraphicsView : public QGraphicsView
@@ -9,6 +10,8 @@ class GraphicsView : public QGraphicsView
 public:
     GraphicsView(QWidget *parent = nullptr);
 
+    void showFromUrlList(const QList<QUrl> &urlList);
+
     void showImage(const QPixmap &pixmap);
     void showText(const QString &text);
     void showSvg(const QString &filepath);

main.cpp

@@ -1,12 +1,33 @@
 #include "mainwindow.h"
 #include <QApplication>
+#include <QCommandLineParser>
+#include <QUrl>
 
 int main(int argc, char *argv[])
 {
     QApplication a(argc, argv);
 
+    // parse commandline arguments
+    QCommandLineParser parser;
+    parser.addPositionalArgument("File list", QCoreApplication::translate("main", "File list."));
+
+    parser.process(a);
+
+    QStringList urlStrList = parser.positionalArguments();
+    QList<QUrl> urlList;
+    for (const QString & str : urlStrList) {
+        QUrl url = QUrl::fromLocalFile(str);
+        if (url.isValid()) {
+            urlList.append(url);
+        }
+    }
+
     MainWindow w;
     w.show();
 
+    if (!urlList.isEmpty()) {
+        w.showUrls(urlList);
+    }
+
     return a.exec();
 }

mainwindow.cpp

@@ -38,11 +38,11 @@ MainWindow::MainWindow(QWidget *parent) :
 
     GraphicsScene * scene = new GraphicsScene(this);
 
-    GraphicsView * pictureView = new GraphicsView(this);
+    m_graphicsView = new GraphicsView(this);
-    pictureView->setScene(scene);
+    m_graphicsView->setScene(scene);
-    this->setCentralWidget(pictureView);
+    this->setCentralWidget(m_graphicsView);
 
-    m_closeButton = new QPushButton(pictureView);
+    m_closeButton = new QPushButton(m_graphicsView);
     m_closeButton->setFlat(true);
     m_closeButton->setFixedSize(50, 50);
     m_closeButton->setStyleSheet("QPushButton {"
@@ -58,13 +58,13 @@ MainWindow::MainWindow(QWidget *parent) :
     m_bottomButtonGroup = new BottomButtonGroup(this);
 
     connect(m_bottomButtonGroup, &BottomButtonGroup::resetToOriginalBtnClicked,
-            this, [ = ](){ pictureView->setTransform(QTransform()); });
+            this, [ = ](){ m_graphicsView->setTransform(QTransform()); });
     connect(m_bottomButtonGroup, &BottomButtonGroup::zoomInBtnClicked,
-            this, [ = ](){ pictureView->scale(1.25, 1.25); });
+            this, [ = ](){ m_graphicsView->scale(1.25, 1.25); });
     connect(m_bottomButtonGroup, &BottomButtonGroup::zoomOutBtnClicked,
-            this, [ = ](){ pictureView->scale(0.75, 0.75); });
+            this, [ = ](){ m_graphicsView->scale(0.75, 0.75); });
     connect(m_bottomButtonGroup, &BottomButtonGroup::toggleCheckerboardBtnClicked,
-            this, [ = ](){ pictureView->toggleCheckerboard(); });
+            this, [ = ](){ m_graphicsView->toggleCheckerboard(); });
 
     this->setGeometry(
         QStyle::alignedRect(
@@ -81,6 +81,11 @@ MainWindow::~MainWindow()
 
 }
 
+void MainWindow::showUrls(const QList<QUrl> &urls)
+{
+    m_graphicsView->showFromUrlList(urls);
+}
+
 void MainWindow::showEvent(QShowEvent *event)
 {
     updateWidgetsPosition();

mainwindow.h

@@ -6,6 +6,7 @@
 #include <QPropertyAnimation>
 #include <QPushButton>
 
+class GraphicsView;
 class BottomButtonGroup;
 class MainWindow : public QMainWindow
 {
@@ -15,6 +16,8 @@ public:
     explicit MainWindow(QWidget *parent = nullptr);
     ~MainWindow() override;
 
+    void showUrls(const QList<QUrl> &urls);
+
 protected slots:
     void showEvent(QShowEvent *event) override;
     void mousePressEvent(QMouseEvent *event) override;
@@ -34,6 +37,7 @@ private:
     QPropertyAnimation *m_floatUpAnimation;
     QParallelAnimationGroup *m_exitAnimationGroup;
     QPushButton *m_closeButton;
+    GraphicsView *m_graphicsView;
     BottomButtonGroup *m_bottomButtonGroup;
     bool m_clickedOnWindow = false;
 };