Add config setting for default subtitle duration, add subtitle by double clicking in subtitle track

src/kdenlivesettings.kcfg

@@ -85,6 +85,11 @@
       <label>Default mix transition duration.</label>
       <default>00:00:01:00</default>
     </entry>
+    
+    <entry name="subtitle_duration" type="String">
+      <label>Default subtitle duration.</label>
+      <default>00:00:05:00</default>
+    </entry>
 
     <entry name="autoimagesequence" type="Bool">
       <label>Automatically import image sequences.</label>

src/timeline2/view/qml/timeline.qml

@@ -874,6 +874,11 @@ Rectangle {
             onExited: {
                 scim = false
             }
+            onDoubleClicked: {
+                if (root.showSubtitles && root.activeTool === 0 && mouse.y > ruler.height && mouse.y < (ruler.height + subtitleTrack.height)) {
+                    timeline.addSubtitle((scrollView.contentX + mouseX) / timeline.scaleFactor)
+                }
+            }
             onPositionChanged: {
                 if (pressed && ((mouse.buttons === Qt.MidButton) || (mouse.buttons === Qt.LeftButton && root.activeTool == 0 && (mouse.modifiers & Qt.ControlModifier) && !shiftPress))) {
                     // Pan view

src/timeline2/view/timelinecontroller.cpp

@@ -3829,10 +3829,12 @@ void TimelineController::shiftSubtitle(int oldStartFrame, int newStartFrame, int
     pCore->pushUndo(local_undo, local_redo, i18n("Move subtitle"));
 }
 
-void TimelineController::addSubtitle()
+void TimelineController::addSubtitle(int startframe)
 {
-    int startframe = pCore->getTimelinePosition();
-    int endframe = startframe + 50; //create basic subtitle clip of default width
+    if (startframe == -1) {
+        startframe = pCore->getTimelinePosition();
+    }
+    int endframe = startframe + pCore->getDurationFromString(KdenliveSettings::subtitle_duration());
 
     auto subtitleModel = pCore->projectManager()->current()->getSubtitleModel();
     Fun local_undo = [subtitleModel, startframe, endframe]() {

src/timeline2/view/timelinecontroller.h

@@ -579,7 +579,7 @@ public:
     /** @brief Shift subtitle clips without changing the clip duration */
     Q_INVOKABLE void shiftSubtitle(int oldStartFrame, int newStartFrame, int endFrame=0, QString text = QString());
     /** @brief Add subtitle clip at cursor's position in timeline */
-    Q_INVOKABLE void addSubtitle();
+    Q_INVOKABLE void addSubtitle(int startframe = -1);
     /** @brief Delete subtitle clip with frame as start position*/
     Q_INVOKABLE void deleteSubtitle(int frameframe, int endframe, QString Ctext);
 

src/ui/configmisc_ui.ui

@@ -124,6 +124,16 @@
       <item row="3" column="1">
        <widget class="QLineEdit" name="kcfg_mix_duration"/>
       </item>
+      <item row="3" column="3">
+       <widget class="QLineEdit" name="kcfg_subtitle_duration"/>
+      </item>
+      <item row="3" column="2">
+       <widget class="QLabel" name="label_9">
+        <property name="text">
+         <string>Subtitles</string>
+        </property>
+       </widget>
+      </item>
      </layout>
     </widget>
    </item>