API for custom article previwer per account

src/librssguard/CMakeLists.txt

@@ -250,6 +250,8 @@ set(SOURCES
   services/abstract/gui/formcategorydetails.h
   services/abstract/gui/formfeeddetails.cpp
   services/abstract/gui/formfeeddetails.h
+  services/abstract/gui/custommessagepreviewer.h
+  services/abstract/gui/custommessagepreviewer.cpp
   services/abstract/importantnode.cpp
   services/abstract/importantnode.h
   services/abstract/label.cpp

src/librssguard/gui/dialogs/formabout.ui

@@ -126,8 +126,8 @@
           <string notr="true">&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.0//EN&quot; &quot;http://www.w3.org/TR/REC-html40/strict.dtd&quot;&gt;
 &lt;html&gt;&lt;head&gt;&lt;meta name=&quot;qrichtext&quot; content=&quot;1&quot; /&gt;&lt;meta charset=&quot;utf-8&quot; /&gt;&lt;style type=&quot;text/css&quot;&gt;
 p, li { white-space: pre-wrap; }
-&lt;/style&gt;&lt;/head&gt;&lt;body style=&quot; font-family:'DejaVu Sans Mono'; font-size:10pt; font-weight:400; font-style:normal;&quot;&gt;
+&lt;/style&gt;&lt;/head&gt;&lt;body style=&quot; font-family:'Segoe UI'; font-size:9pt; font-weight:400; font-style:normal;&quot;&gt;
-&lt;p style=&quot;-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'Sans Serif'; font-size:9pt;&quot;&gt;&lt;br /&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+&lt;p style=&quot;-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'Sans Serif';&quot;&gt;&lt;br /&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
          </property>
          <property name="acceptRichText">
           <bool>false</bool>
@@ -160,8 +160,8 @@ p, li { white-space: pre-wrap; }
            <rect>
             <x>0</x>
             <y>0</y>
-            <width>691</width>
+            <width>685</width>
-            <height>139</height>
+            <height>141</height>
            </rect>
           </property>
           <property name="autoFillBackground">
@@ -216,8 +216,8 @@ p, li { white-space: pre-wrap; }
               <string notr="true">&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.0//EN&quot; &quot;http://www.w3.org/TR/REC-html40/strict.dtd&quot;&gt;
 &lt;html&gt;&lt;head&gt;&lt;meta name=&quot;qrichtext&quot; content=&quot;1&quot; /&gt;&lt;meta charset=&quot;utf-8&quot; /&gt;&lt;style type=&quot;text/css&quot;&gt;
 p, li { white-space: pre-wrap; }
-&lt;/style&gt;&lt;/head&gt;&lt;body style=&quot; font-family:'DejaVu Sans Mono'; font-size:10pt; font-weight:400; font-style:normal;&quot;&gt;
+&lt;/style&gt;&lt;/head&gt;&lt;body style=&quot; font-family:'Segoe UI'; font-size:9pt; font-weight:400; font-style:normal;&quot;&gt;
-&lt;p style=&quot;-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'Sans Serif'; font-size:9pt;&quot;&gt;&lt;br /&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+&lt;p style=&quot;-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'Sans Serif';&quot;&gt;&lt;br /&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
              </property>
              <property name="textInteractionFlags">
               <set>Qt::LinksAccessibleByMouse|Qt::TextSelectableByMouse</set>
@@ -234,8 +234,8 @@ p, li { white-space: pre-wrap; }
            <rect>
             <x>0</x>
             <y>0</y>
-            <width>87</width>
+            <width>83</width>
-            <height>64</height>
+            <height>69</height>
            </rect>
           </property>
           <attribute name="label">
@@ -284,8 +284,8 @@ p, li { white-space: pre-wrap; }
               <string notr="true">&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.0//EN&quot; &quot;http://www.w3.org/TR/REC-html40/strict.dtd&quot;&gt;
 &lt;html&gt;&lt;head&gt;&lt;meta name=&quot;qrichtext&quot; content=&quot;1&quot; /&gt;&lt;meta charset=&quot;utf-8&quot; /&gt;&lt;style type=&quot;text/css&quot;&gt;
 p, li { white-space: pre-wrap; }
-&lt;/style&gt;&lt;/head&gt;&lt;body style=&quot; font-family:'DejaVu Sans Mono'; font-size:10pt; font-weight:400; font-style:normal;&quot;&gt;
+&lt;/style&gt;&lt;/head&gt;&lt;body style=&quot; font-family:'Segoe UI'; font-size:9pt; font-weight:400; font-style:normal;&quot;&gt;
-&lt;p style=&quot;-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'Sans Serif'; font-size:9pt;&quot;&gt;&lt;br /&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+&lt;p style=&quot;-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'Sans Serif';&quot;&gt;&lt;br /&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
              </property>
              <property name="textInteractionFlags">
               <set>Qt::LinksAccessibleByMouse|Qt::TextSelectableByMouse</set>
@@ -302,8 +302,8 @@ p, li { white-space: pre-wrap; }
            <rect>
             <x>0</x>
             <y>0</y>
-            <width>87</width>
+            <width>83</width>
-            <height>64</height>
+            <height>69</height>
            </rect>
           </property>
           <attribute name="label">
@@ -352,8 +352,8 @@ p, li { white-space: pre-wrap; }
               <string notr="true">&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.0//EN&quot; &quot;http://www.w3.org/TR/REC-html40/strict.dtd&quot;&gt;
 &lt;html&gt;&lt;head&gt;&lt;meta name=&quot;qrichtext&quot; content=&quot;1&quot; /&gt;&lt;meta charset=&quot;utf-8&quot; /&gt;&lt;style type=&quot;text/css&quot;&gt;
 p, li { white-space: pre-wrap; }
-&lt;/style&gt;&lt;/head&gt;&lt;body style=&quot; font-family:'DejaVu Sans Mono'; font-size:10pt; font-weight:400; font-style:normal;&quot;&gt;
+&lt;/style&gt;&lt;/head&gt;&lt;body style=&quot; font-family:'Segoe UI'; font-size:9pt; font-weight:400; font-style:normal;&quot;&gt;
-&lt;p style=&quot;-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'Sans Serif'; font-size:9pt;&quot;&gt;&lt;br /&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+&lt;p style=&quot;-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'Sans Serif';&quot;&gt;&lt;br /&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
              </property>
              <property name="textInteractionFlags">
               <set>Qt::LinksAccessibleByMouse|Qt::TextSelectableByMouse</set>
@@ -396,8 +396,8 @@ p, li { white-space: pre-wrap; }
           <string notr="true">&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.0//EN&quot; &quot;http://www.w3.org/TR/REC-html40/strict.dtd&quot;&gt;
 &lt;html&gt;&lt;head&gt;&lt;meta name=&quot;qrichtext&quot; content=&quot;1&quot; /&gt;&lt;meta charset=&quot;utf-8&quot; /&gt;&lt;style type=&quot;text/css&quot;&gt;
 p, li { white-space: pre-wrap; }
-&lt;/style&gt;&lt;/head&gt;&lt;body style=&quot; font-family:'DejaVu Sans Mono'; font-size:10pt; font-weight:400; font-style:normal;&quot;&gt;
+&lt;/style&gt;&lt;/head&gt;&lt;body style=&quot; font-family:'Segoe UI'; font-size:9pt; font-weight:400; font-style:normal;&quot;&gt;
-&lt;p style=&quot;-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'Sans Serif'; font-size:9pt;&quot;&gt;&lt;br /&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+&lt;p style=&quot;-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'Sans Serif';&quot;&gt;&lt;br /&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
          </property>
          <property name="acceptRichText">
           <bool>false</bool>

src/librssguard/gui/messagepreviewer.cpp

@@ -10,6 +10,7 @@
 #include "gui/webbrowser.h"
 #include "miscellaneous/application.h"
 #include "network-web/webfactory.h"
+#include "services/abstract/gui/custommessagepreviewer.h"
 #include "services/abstract/label.h"
 #include "services/abstract/labelsnode.h"
 #include "services/abstract/serviceroot.h"
@@ -108,12 +109,22 @@ void MessagePreviewer::loadMessage(const Message& message, RootItem* root) {
         return it->kind() == RootItem::Kind::Feed && it->customId() == msg_feed_id;
       })->toFeed();
 
+      // TODO: tady místo na otevření skrze custom previewer, pokud
+      // ho root má.
+
       if (feed != nullptr && feed->openArticlesDirectly() && !m_message.m_url.isEmpty()) {
         m_msgBrowser->setVerticalScrollBarPosition(0.0);
         m_msgBrowser->loadUrl(m_message.m_url);
       }
       else {
-        m_msgBrowser->loadMessages({ message }, m_root);
+        CustomMessagePreviewer* custom_previewer = root->getParentServiceRoot()->customMessagePreviewer();
+
+        if (custom_previewer != nullptr) {
+          custom_previewer->loadMessage(message, m_root);
+        }
+        else {
+          m_msgBrowser->loadMessages({ message }, m_root);
+        }
       }
     }
   }

src/librssguard/services/abstract/gui/custommessagepreviewer.cpp

@@ -0,0 +1,5 @@
+// For license of this file, see <project-root-folder>/LICENSE.md.
+
+#include "services/abstract/gui/custommessagepreviewer.h"
+
+CustomMessagePreviewer::CustomMessagePreviewer(QWidget* parent) : QWidget{parent} {}

src/librssguard/services/abstract/gui/custommessagepreviewer.h

@@ -0,0 +1,27 @@
+// For license of this file, see <project-root-folder>/LICENSE.md.
+
+#ifndef CUSTOMMESSAGEPREVIEWER_H
+#define CUSTOMMESSAGEPREVIEWER_H
+
+#include <QWidget>
+
+#include "core/message.h"
+
+class RootItem;
+
+class CustomMessagePreviewer : public QWidget {
+  Q_OBJECT
+
+  public:
+    explicit CustomMessagePreviewer(QWidget* parent = nullptr);
+
+  public:
+
+    // Clears displayed message.
+    virtual void clear() = 0;
+
+    // Displays the message.
+    virtual void loadMessage(const Message& msg, RootItem* selected_item) = 0;
+};
+
+#endif // CUSTOMMESSAGEPREVIEWER_H

src/librssguard/services/abstract/serviceroot.cpp

@@ -13,6 +13,7 @@
 #include "services/abstract/cacheforserviceroot.h"
 #include "services/abstract/category.h"
 #include "services/abstract/feed.h"
+#include "services/abstract/gui/custommessagepreviewer.h"
 #include "services/abstract/importantnode.h"
 #include "services/abstract/labelsnode.h"
 #include "services/abstract/recyclebin.h"
@@ -131,6 +132,10 @@ void ServiceRoot::start(bool freshly_activated) {
 
 void ServiceRoot::stop() {}
 
+CustomMessagePreviewer* ServiceRoot::customMessagePreviewer() {
+  return nullptr;
+}
+
 void ServiceRoot::updateCounts(bool including_total_count) {
   QList<Feed*> feeds;
   auto str = getSubTree();

src/librssguard/services/abstract/serviceroot.h

@@ -13,14 +13,15 @@
 #include <QNetworkProxy>
 #include <QPair>
 
+class QAction;
 class FeedsModel;
 class RecycleBin;
 class ImportantNode;
 class UnreadNode;
 class LabelsNode;
 class Label;
-class QAction;
 class MessagesModel;
+class CustomMessagePreviewer;
 class CacheForServiceRoot;
 
 // THIS IS the root node of the service.
@@ -112,11 +113,13 @@ class ServiceRoot : public RootItem {
                                              const QHash<ServiceRoot::BagOfMessages, QStringList>& stated_messages,
                                              const QHash<QString, QStringList>& tagged_messages) = 0;
 
-    // This method should prepare messages for given "item" (download them maybe?)
+    // Returns special widget to display articles of this account type.
-    // into predefined "Messages" table
+    // Caller does NOT free returned previewer after usage from memory,
-    // and then use method QSqlTableModel::setFilter(....).
+    // it only may hide it.
-    // NOTE: It would be more preferable if all messages are downloaded
+    // Thus, account is responsible to free any custom previewers.
-    // right when feeds are updated.
+    virtual CustomMessagePreviewer* customMessagePreviewer();
+
+    // This method should load messages for given "item" into model.
     virtual bool loadMessagesForItem(RootItem* item, MessagesModel* model);
 
     // Called BEFORE this read status update (triggered by user in message list) is stored in DB,