texteditor: Add Select Next Match function

Adds an Action to select the next occurrence(s) of the currently selected text.

Change-Id: I37e23a3c2d1651ec4898fac53d75044d92ed7079
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/texteditor/texteditor.cpp

@@ -529,6 +529,7 @@ public:
     void handleBackspaceKey();
     void moveLineUpDown(bool up);
     void copyLineUpDown(bool up);
+    void addSelectionNextFindMatch();
     void saveCurrentCursorPositionForNavigation();
     void updateHighlights();
     void updateCurrentLineInScrollbar();
@@ -6718,6 +6719,40 @@ void TextEditorWidget::copyLine()
     copy();
 }
 
+void TextEditorWidgetPrivate::addSelectionNextFindMatch()
+{
+    MultiTextCursor cursor = q->multiTextCursor();
+    const QList<QTextCursor> cursors = cursor.cursors();
+
+    if (cursor.cursorCount() == 0 || !cursors.first().hasSelection())
+        return;
+
+    const QTextCursor &firstCursor = cursors.first();
+    QTextDocumentFragment selection = firstCursor.selection();
+    QTextDocument *document = firstCursor.document();
+
+    if (Utils::anyOf(cursors, [&firstCursor](const QTextCursor &c) {
+            return c.selection().toPlainText().toCaseFolded()
+                   != firstCursor.selection().toPlainText().toCaseFolded();
+        })) {
+        return;
+    }
+
+    int searchFrom = cursors.last().selectionEnd();
+    while (true) {
+        QTextCursor next = document->find(selection.toPlainText(), searchFrom);
+        if (next.isNull()) {
+            searchFrom = 0;
+            continue;
+        }
+        if (next.selectionStart() == firstCursor.selectionStart())
+            break;
+        cursor.addCursor(next);
+        q->setMultiTextCursor(cursor);
+        break;
+    }
+}
+
 void TextEditorWidgetPrivate::duplicateSelection(bool comment)
 {
     if (comment && !m_commentDefinition.hasMultiLineStyle())
@@ -6762,6 +6797,11 @@ void TextEditorWidget::duplicateSelection()
     d->duplicateSelection(false);
 }
 
+void TextEditorWidget::addSelectionNextFindMatch()
+{
+    d->addSelectionNextFindMatch();
+}
+
 void TextEditorWidget::duplicateSelectionAndComment()
 {
     d->duplicateSelection(true);

src/plugins/texteditor/texteditor.h

@@ -384,6 +384,7 @@ public:
     void updateTextCodecLabel();
     void selectLineEnding(int index);
     void updateTextLineEndingLabel();
+    void addSelectionNextFindMatch();
 
     void gotoBlockStart();
     void gotoBlockEnd();

src/plugins/texteditor/texteditoractionhandler.cpp

@@ -329,6 +329,10 @@ void TextEditorActionHandlerPrivate::createActions()
             [] (TextEditorWidget *w) { w->copyLine(); }, false, tr("Copy &Line"),
             QKeySequence(tr("Ctrl+Ins")),
             G_EDIT_TEXT, advancedEditMenu);
+    registerAction(ADD_SELECT_NEXT_FIND_MATCH,
+            [] (TextEditorWidget *w) { w->addSelectionNextFindMatch(); }, false, tr("Add Selection to Next Find Match"),
+            QKeySequence(tr("Ctrl+D")),
+            G_EDIT_TEXT, advancedEditMenu);
     m_modifyingActions << registerAction(DUPLICATE_SELECTION,
             [] (TextEditorWidget *w) { w->duplicateSelection(); }, false, tr("&Duplicate Selection"),
             QKeySequence(),

src/plugins/texteditor/texteditorconstants.h

@@ -168,6 +168,7 @@ const char LOWERCASE_SELECTION[]   = "TextEditor.LowercaseSelection";
 const char SORT_SELECTED_LINES[]   = "TextEditor.SortSelectedLines";
 const char CUT_LINE[]              = "TextEditor.CutLine";
 const char COPY_LINE[]             = "TextEditor.CopyLine";
+const char ADD_SELECT_NEXT_FIND_MATCH[] = "TextEditor.AddSelectionNextFindMatch";
 const char DUPLICATE_SELECTION[]   = "TextEditor.DuplicateSelection";
 const char DUPLICATE_SELECTION_AND_COMMENT[] = "TextEditor.DuplicateSelectionAndComment";
 const char DELETE_LINE[]           = "TextEditor.DeleteLine";