auto adjust window size

icons/app-icon.svg

@@ -0,0 +1,102 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="32"
+   height="32"
+   viewBox="0 0 8.4666665 8.4666669"
+   version="1.1"
+   id="svg8"
+   inkscape:version="0.92.4 (5da689c313, 2019-01-14)"
+   sodipodi:docname="view-fullscreen - 副本.svg">
+  <defs
+     id="defs2" />
+  <sodipodi:namedview
+     id="base"
+     pagecolor="#000000"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:pageopacity="0.69803922"
+     inkscape:pageshadow="2"
+     inkscape:zoom="22.4"
+     inkscape:cx="11.283707"
+     inkscape:cy="14.931415"
+     inkscape:document-units="px"
+     inkscape:current-layer="layer1"
+     showgrid="false"
+     units="px"
+     inkscape:pagecheckerboard="true"
+     inkscape:window-width="1920"
+     inkscape:window-height="1001"
+     inkscape:window-x="-9"
+     inkscape:window-y="-9"
+     inkscape:window-maximized="1" />
+  <metadata
+     id="metadata5">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title />
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     inkscape:label="Layer 1"
+     inkscape:groupmode="layer"
+     id="layer1"
+     transform="translate(0,-288.5333)">
+    <path
+       style="fill:none;stroke:#ffffff;stroke-width:0.26458332px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 1.6393869,293.16031 1.615848,290.14918 H 3.6380209"
+       id="path837"
+       inkscape:connector-curvature="0"
+       sodipodi:nodetypes="ccc" />
+    <path
+       style="fill:none;stroke:#ffffff;stroke-width:0.26531255px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="m 6.9097992,291.96816 0.014252,-1.85441 -3.2860303,0.0354"
+       id="path837-6"
+       inkscape:connector-curvature="0"
+       sodipodi:nodetypes="ccc" />
+    <path
+       style="fill:none;stroke:#ffffff;stroke-width:0.26458332px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="m 6.9097992,291.96816 0.035006,3.10579 H 4.9226322"
+       id="path837-9"
+       inkscape:connector-curvature="0"
+       sodipodi:nodetypes="ccc" />
+    <path
+       style="fill:none;stroke:#ffffff;stroke-width:0.26531255px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="m 1.6393869,293.16031 -0.00244,1.90166 3.2856855,0.012"
+       id="path837-6-4"
+       inkscape:connector-curvature="0"
+       sodipodi:nodetypes="ccc" />
+    <path
+       style="fill:none;stroke:#ffffff;stroke-width:0.26458332px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="m 1.6418341,292.9131 0.8740699,-0.51972 c 0,0 0.4960938,-0.29529 0.8622581,-0.11812 0.3661646,0.17718 0.094494,0.0236 0.3661646,0.17718 0.2716702,0.15355 0.2716702,0.16537 0.2716702,0.16537 l 0.5669645,0.60239 c 0,0 0.9921875,1.16937 1.1339284,1.37017 l 0.1299292,0.21261 0.1417411,0.30711"
+       id="path819"
+       inkscape:connector-curvature="0"
+       sodipodi:nodetypes="ccccccscc" />
+    <path
+       style="fill:none;stroke:#ffffff;stroke-width:0.26458332px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="m 5.1144902,293.84623 0.4488469,-0.62603 c 0,0 0.3071055,-0.22442 0.5669642,-0.2008 l 0.2598587,0.0236 0.3425409,0.12993 v 0 l 0.2480469,0.14174"
+       id="path821"
+       inkscape:connector-curvature="0"
+       sodipodi:nodetypes="ccccccc" />
+    <ellipse
+       style="fill:#ffffff;fill-opacity:0.87058824;stroke:none;stroke-width:0;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+       id="path823"
+       cx="5.0849609"
+       cy="291.8028"
+       rx="0.86816406"
+       ry="0.8976934" />
+  </g>
+</svg>

main.cpp

@@ -27,6 +27,7 @@ int main(int argc, char *argv[])
 
     if (!urlList.isEmpty()) {
         w.showUrls(urlList);
+        w.adjustWindowSizeBySceneRect();
     }
 
     return a.exec();

mainwindow.cpp

@@ -22,6 +22,7 @@ MainWindow::MainWindow(QWidget *parent) :
     this->setWindowFlags(Qt::Window | Qt::FramelessWindowHint);
     this->setAttribute(Qt::WA_TranslucentBackground, true);
     this->setMinimumSize(710, 530);
+    this->setWindowIcon(QIcon(":/icons/app-icon.svg"));
 
     m_fadeOutAnimation = new QPropertyAnimation(this, "windowOpacity");
     m_fadeOutAnimation->setDuration(300);
@@ -66,14 +67,7 @@ MainWindow::MainWindow(QWidget *parent) :
     connect(m_bottomButtonGroup, &BottomButtonGroup::toggleCheckerboardBtnClicked,
             this, [ = ](){ m_graphicsView->toggleCheckerboard(); });
 
-    this->setGeometry(
+    centerWindow();
-        QStyle::alignedRect(
-            Qt::LeftToRight,
-            Qt::AlignCenter,
-            this->size(),
-            qApp->screenAt(QCursor::pos())->geometry()
-        )
-    );
 }
 
 MainWindow::~MainWindow()
@@ -86,6 +80,28 @@ void MainWindow::showUrls(const QList<QUrl> &urls)
     m_graphicsView->showFromUrlList(urls);
 }
 
+void MainWindow::adjustWindowSizeBySceneRect()
+{
+    if (m_graphicsView->transform().m11() < 1) {
+        // if it scaled down by the resize policy:
+        QSize screenSize = qApp->screenAt(QCursor::pos())->availableSize();
+        QSize sceneSize = m_graphicsView->sceneRect().toRect().size();
+        QSize sceneSizeWithMargins = sceneSize + QSize(20, 20);
+        if (screenSize.expandedTo(sceneSize) == screenSize) {
+            // we can show the picture by increase the window size.
+            if (screenSize.expandedTo(sceneSizeWithMargins) == screenSize) {
+                this->resize(sceneSizeWithMargins);
+            } else {
+                this->resize(screenSize);
+            }
+            centerWindow();
+        } else {
+            // toggle maximum
+            showMaximized();
+        }
+    }
+}
+
 void MainWindow::showEvent(QShowEvent *event)
 {
     updateWidgetsPosition();
@@ -223,6 +239,18 @@ bool MainWindow::nativeEvent(const QByteArray &eventType, void *message, long *r
 #endif // _WIN32
 }
 
+void MainWindow::centerWindow()
+{
+    this->setGeometry(
+        QStyle::alignedRect(
+            Qt::LeftToRight,
+            Qt::AlignCenter,
+            this->size(),
+            qApp->screenAt(QCursor::pos())->geometry()
+        )
+    );
+}
+
 void MainWindow::closeWindow()
 {
     QRect windowRect(this->geometry());

mainwindow.h

@@ -17,6 +17,7 @@ public:
     ~MainWindow() override;
 
     void showUrls(const QList<QUrl> &urls);
+    void adjustWindowSizeBySceneRect();
 
 protected slots:
     void showEvent(QShowEvent *event) override;
@@ -28,6 +29,7 @@ protected slots:
 
     bool nativeEvent(const QByteArray& eventType, void* message, long* result) override;
 
+    void centerWindow();
     void closeWindow();
     void updateWidgetsPosition();
 

resources.qrc

@@ -6,5 +6,6 @@
         <file>icons/zoom-original.svg</file>
         <file>icons/object-rorate-right.svg</file>
         <file>icons/view-background-checkerboard.svg</file>
+        <file>icons/app-icon.svg</file>
     </qresource>
 </RCC>