fix segfault on exit, some UI fixes

Author: skvark

qml/pages/MainPage.qml

@@ -89,17 +89,22 @@ Page {
             enabled: idle
 
             Image {
-                anchors.fill: parent
+                anchors {
+                    top: label1.bottom
+                    left: parent.left
+                    right: parent.right
+                }
                 fillMode: Image.Pad
                 horizontalAlignment: Image.AlignHCenter
-                verticalAlignment: Image.AlignVCenter
                 source: "image://theme/icon-m-camera"
                 scale: 1.5
                 z: 30
             }
 
             Label {
+                id: label1
                 anchors.topMargin: 10;
+                anchors.bottomMargin: 10;
                 anchors.top: parent.top
                 width: parent.width
                 horizontalAlignment: Text.AlignHCenter
@@ -123,16 +128,21 @@ Page {
             enabled: idle
 
             Image {
-                anchors.fill: parent
+                anchors {
+                    top: label2.bottom
+                    left: parent.left
+                    right: parent.right
+                }
                 fillMode: Image.Pad
                 horizontalAlignment: Image.AlignHCenter
-                verticalAlignment: Image.AlignVCenter
                 source: "image://theme/icon-l-image"
                 z: 30
             }
 
             Label {
+                id: label2
                 anchors.topMargin: 10;
+                anchors.bottomMargin: 10;
                 anchors.top: parent.top
                 width: parent.width
                 horizontalAlignment: Text.AlignHCenter
@@ -174,16 +184,21 @@ Page {
             enabled: idle
 
             Image {
-                anchors.fill: parent
+                anchors {
+                    top: label3.bottom
+                    left: parent.left
+                    right: parent.right
+                }
                 fillMode: Image.Pad
                 horizontalAlignment: Image.AlignHCenter
-                verticalAlignment: Image.AlignVCenter
                 source: "image://theme/icon-l-document"
                 z: 30
             }
 
             Label {
+                id: label3
                 anchors.topMargin: 10;
+                anchors.bottomMargin: 10;
                 anchors.top: parent.top
                 width: parent.width
                 horizontalAlignment: Text.AlignHCenter

src/tesseractapi.cpp

@@ -35,23 +35,27 @@ TesseractAPI::TesseractAPI(QObject *parent) :
 
     info_ = Info();
     cancel_ = false;
+    run_at_least_once_ = false;
 }
 
 TesseractAPI::~TesseractAPI()
 {
-    delete monitor_;
-    monitor_ = 0;
     delete settingsManager_;
     settingsManager_ = 0;
     delete downloadManager_;
     downloadManager_ = 0;
     delete timer_;
     timer_ = 0;
+
     delete PDFhandler_;
     PDFhandler_ = 0;
-    api_->End();
-    delete api_;
-    api_ = 0;
+
+    delete monitor_;
+    monitor_ = 0;
+    if(run_at_least_once_) {
+        api_->End();
+        api_ = 0;
+    }
 }
 
 void TesseractAPI::prepareForCropping(QString imagepath, int rotation, bool gallery) {
@@ -89,6 +93,7 @@ void TesseractAPI::analyze(QString imagepath, QVariant cropPoints)
     // Periodically firing timer to get progress reports to the UI.
     connect(timer_, SIGNAL(timeout()), this, SLOT(update()));
     timer_->start(250);
+    run_at_least_once_ = true;
 }
 
 PDFThumbnailProvider *TesseractAPI::getThumbnailProvider() {
@@ -133,6 +138,7 @@ void TesseractAPI::analyzePDF(QList<int> pages)
     // Periodically firing timer to get progress reports to the UI.
     connect(timer_, SIGNAL(timeout()), this, SLOT(update()));
     timer_->start(250);
+    run_at_least_once_ = true;
 }
 
 void TesseractAPI::cancel()

src/tesseractapi.h

@@ -97,6 +97,7 @@ public slots:
     QString rotatedPath_;
     bool rotated_;
     bool thumbsReady_;
+    bool run_at_least_once_;
     unsigned int previousPage_;
 
     ETEXT_DESC *monitor_;