okularkirigami: Show document error/warning/notice

mobile/app/package/contents/ui/MainView.qml

@@ -10,6 +10,8 @@ import org.kde.okular 2.0 as Okular
 import org.kde.kirigami 2.10 as Kirigami
 
 Kirigami.Page {
+    id: root
+
     property alias document: pageArea.document
     leftPadding: 0
     topPadding: 0
@@ -34,6 +36,47 @@ Kirigami.Page {
         onClicked: fileBrowserRoot.controlsVisible = !fileBrowserRoot.controlsVisible
     }
 
+    Connections {
+        target: root.document
+
+        onError: (text, duration) => {
+            inlineMessage.showMessage(Kirigami.MessageType.Error, text,  duration);
+        }
+
+        onWarning: (text, duration) => {
+            inlineMessage.showMessage(Kirigami.MessageType.Warning, text,  duration);
+        }
+
+        onNotice: (text, duration) => {
+            inlineMessage.showMessage(Kirigami.MessageType.Information, text,  duration);
+        }
+    }
+
+    Kirigami.InlineMessage {
+        id: inlineMessage
+        width: parent.width
+
+        function showMessage(type, text, duration) {
+            inlineMessage.type = type;
+            inlineMessage.text = text;
+            inlineMessage.visible = true;
+            inlineMessageTimer.interval = duration > 0 ? duration : 500 + 100 * text.length;
+        }
+
+        onVisibleChanged: {
+            if (visible) {
+                inlineMessageTimer.start()
+            } else {
+                inlineMessageTimer.stop()
+            }
+        }
+
+        Timer {
+            id: inlineMessageTimer
+            onTriggered: inlineMessage.visible = false
+        }
+    }
+
     // TODO KF 5.64 replace usage by upstream PlaceholderMessage
     PlaceholderMessage {
         visible: documentItem.url.toString().length === 0

mobile/components/documentitem.cpp

@@ -34,6 +34,9 @@ DocumentItem::DocumentItem(QObject *parent)
     connect(m_document, &Okular::Document::searchFinished, this, &DocumentItem::searchFinished);
     connect(m_document->bookmarkManager(), &Okular::BookmarkManager::bookmarksChanged, this, &DocumentItem::bookmarkedPagesChanged);
     connect(m_document->bookmarkManager(), &Okular::BookmarkManager::bookmarksChanged, this, &DocumentItem::bookmarksChanged);
+    connect(m_document, &Okular::Document::error, this, &DocumentItem::error);
+    connect(m_document, &Okular::Document::warning, this, &DocumentItem::warning);
+    connect(m_document, &Okular::Document::notice, this, &DocumentItem::notice);
 }
 
 DocumentItem::~DocumentItem()

mobile/components/documentitem.h

@@ -139,6 +139,30 @@ Q_SIGNALS:
     void bookmarksChanged();
     void windowTitleForDocumentChanged();
 
+    /**
+     * This signal is emitted whenever an error occurred.
+     *
+     * @param text The description of the error.
+     * @param duration The time in milliseconds the message should be shown to the user.
+     */
+    void error(const QString &text, int duration);
+
+    /**
+     * This signal is emitted to signal a warning.
+     *
+     * @param text The description of the warning.
+     * @param duration The time in milliseconds the message should be shown to the user.
+     */
+    void warning(const QString &text, int duration);
+
+    /**
+     * This signal is emitted to signal a notice.
+     *
+     * @param text The description of the notice.
+     * @param duration The time in milliseconds the message should be shown to the user.
+     */
+    void notice(const QString &text, int duration);
+
 private Q_SLOTS:
     void searchFinished(int id, Okular::Document::SearchStatus endStatus);