Editor: Allow to open links in a new split.

This changes current behavior while opening links. Link is now opened in
next split by default. If you use CTRL+Click to open links, it will also
open in next split. However, by using CTRL+ALT+click it will open in
current split.

There are two new checkboxes in Tools/Options/Text Editor/Display:
- "Open Links in New Split" - if it is checked, links will not be opened
in current split. However, if document with link is already opened, it
will be used to open the split
- "Force open links in next split" - Links will always open in next
split, even if their document is already opened somewhere else.

Task-number: QTCREATORBUG-8117
Change-Id: Ib99075b55d9e9683ed2c2386767227457de0a3fc
Reviewed-by: David Schulz <david.schulz@digia.com>

src/plugins/texteditor/basetexteditor.cpp

@@ -1068,7 +1068,35 @@ void BaseTextEditorWidget::unindent()
 
 void BaseTextEditorWidget::openLinkUnderCursor()
 {
-    openLink(findLinkAt(textCursor()));
+    Core::EditorManager* editorManager = Core::EditorManager::instance();
+    Link symbolLink = findLinkAt(textCursor());
+
+    if (!openLinksInNextSplit() || !editorManager->hasSplitter()) {
+        openLink(symbolLink);
+        return;
+    }
+
+    Core::IEditor *editor = Core::EditorManager::currentEditor();
+
+    if (forceOpenLinksInNextSplit()) {
+        editorManager->gotoOtherSplit();
+    } else {
+        bool isVisible = false;
+        foreach (Core::IEditor *visEditor, editorManager->visibleEditors()) {
+            if (visEditor->document() &&
+                    (symbolLink.fileName == visEditor->document()->fileName()) &&
+                    (visEditor != editor)) {
+                isVisible = true;
+                editorManager->activateEditor(visEditor);
+                break;
+            }
+        }
+
+        if (!isVisible)
+            editorManager->gotoOtherSplit();
+    }
+    openLink(symbolLink);
+    editorManager->activateEditor(editor);
 }
 
 void BaseTextEditorWidget::moveLineUpDown(bool up)
@@ -2297,6 +2325,26 @@ bool BaseTextEditorWidget::lineNumbersVisible() const
     return d->m_lineNumbersVisible;
 }
 
+void BaseTextEditorWidget::setOpenLinksInNextSplit(bool b)
+{
+    d->m_displaySettings.m_openLinksInNextSplit = b;
+}
+
+bool BaseTextEditorWidget::openLinksInNextSplit() const
+{
+    return d->m_displaySettings.m_openLinksInNextSplit;
+}
+
+void BaseTextEditorWidget::setForceOpenLinksInNextSplit(bool b)
+{
+    d->m_displaySettings.m_forceOpenLinksInNextSplit = b;
+}
+
+bool BaseTextEditorWidget::forceOpenLinksInNextSplit() const
+{
+    return d->m_displaySettings.m_forceOpenLinksInNextSplit;
+}
+
 void BaseTextEditorWidget::setMarksVisible(bool b)
 {
     d->m_marksVisible = b;
@@ -4256,13 +4304,38 @@ void BaseTextEditorWidget::mousePressEvent(QMouseEvent *e)
 void BaseTextEditorWidget::mouseReleaseEvent(QMouseEvent *e)
 {
     if (mouseNavigationEnabled()
-        && d->m_linkPressed
-        && e->modifiers() & Qt::ControlModifier
-        && !(e->modifiers() & Qt::ShiftModifier)
-        && e->button() == Qt::LeftButton
-        ) {
+            && d->m_linkPressed
+            && e->modifiers() & Qt::ControlModifier
+            && !(e->modifiers() & Qt::ShiftModifier)
+            && e->button() == Qt::LeftButton
+            ) {
+
+        Core::EditorManager* editorManager = Core::EditorManager::instance();
+        editorManager->addCurrentPositionToNavigationHistory();
+        Core::IEditor *editor = Core::EditorManager::currentEditor();
         const QTextCursor cursor = cursorForPosition(e->pos());
-        if (openLink(findLinkAt(cursor))) {
+        Link symbolLink = findLinkAt(cursor);
+        if (((!(e->modifiers() & Qt::AltModifier)) == openLinksInNextSplit()) &&
+                (editorManager->hasSplitter())) {
+            if (forceOpenLinksInNextSplit()) {
+                editorManager->gotoOtherSplit();
+            } else {
+                bool isVisible = false;
+                foreach (Core::IEditor *visEditor, editorManager->visibleEditors())
+                    if (visEditor->document() &&
+                            (symbolLink.fileName == visEditor->document()->fileName()) &&
+                            (editor != visEditor)) {
+                        isVisible = true;
+                        editorManager->activateEditor(visEditor);
+                        break;
+                    }
+
+                if (!isVisible)
+                    editorManager->gotoOtherSplit();
+            }
+        }
+
+        if (openLink(symbolLink)) {
             clearLink();
             return;
         }