fix find scope scelection, special case empty overlay selections

src/plugins/texteditor/basetexteditor.cpp

@@ -2097,6 +2097,7 @@ void BaseTextEditor::paintEvent(QPaintEvent *e)
         TextEditorOverlay *overlay = new TextEditorOverlay(this);
         overlay->addOverlaySelection(d->m_findScope, d->m_searchScopeFormat.background().color().darker(120),
                                      d->m_searchScopeFormat.background().color());
+        overlay->setAlpha(false);
         overlay->paint(&painter, e->rect());
         delete overlay;
     }

src/plugins/texteditor/texteditoroverlay.cpp

@@ -42,6 +42,7 @@ TextEditorOverlay::TextEditorOverlay(BaseTextEditor *editor)
     m_borderWidth = 1;
     m_dropShadowWidth = 2;
     m_editor = editor;
+    m_alpha = true;
     m_viewport = editor->viewport();
 }
 
@@ -118,7 +119,6 @@ QPainterPath TextEditorOverlay::createSelectionPath(const QTextCursor &begin, co
     if (begin.isNull() || end.isNull() || begin.position() > end.position())
         return QPainterPath();
 
-
     QPointF offset = m_editor->contentOffset();
     QRect viewportRect = rect();
     QTextDocument *document = m_editor->document();
@@ -134,6 +134,18 @@ QPainterPath TextEditorOverlay::createSelectionPath(const QTextCursor &begin, co
 
     QVector<QRectF> selection;
 
+    if (begin.position() == end.position()) {
+        // special case empty selections
+        const QRectF blockGeometry = m_editor->blockBoundingGeometry(block);
+        QTextLayout *blockLayout = block.layout();
+        int pos = begin.position() - begin.block().position();
+        QTextLine line = blockLayout->lineForTextPosition(pos);
+        QRectF lineRect = line.naturalTextRect();
+        int x = line.cursorToX(pos);
+        lineRect.setLeft(x - m_borderWidth);
+        lineRect.setRight(x + m_borderWidth);
+        selection += lineRect.translated(blockGeometry.topLeft());
+    } else {
         for (; block.isValid() && block.blockNumber() <= end.blockNumber(); block = block.next()) {
             if (! block.isVisible())
                 continue;
@@ -194,6 +206,7 @@ QPainterPath TextEditorOverlay::createSelectionPath(const QTextCursor &begin, co
             if (blockGeometry.translated(offset).y() > 2*viewportRect.height())
                 break;
         }
+    }
 
 
     if (selection.isEmpty())
@@ -288,6 +301,7 @@ void TextEditorOverlay::paintSelection(QPainter *painter,
 
     painter->save();
     QColor penColor = fg;
+    if (m_alpha)
         penColor.setAlpha(220);
     QPen pen(penColor, m_borderWidth);
     painter->translate(-.5, -.5);
@@ -295,6 +309,13 @@ void TextEditorOverlay::paintSelection(QPainter *painter,
     QRectF pathRect = path.controlPointRect();
 
     if (bg.isValid()) {
+        if (!m_alpha || begin.blockNumber() != end.blockNumber()) {
+            // gradients are too slow for larger selections :(
+            QColor col = bg;
+            if (m_alpha)
+                col.setAlpha(50);
+            painter->setBrush(col);
+        } else {
             QLinearGradient linearGrad(pathRect.topLeft(), pathRect.bottomLeft());
             QColor col1 = fg.lighter(150);
             col1.setAlpha(20);
@@ -303,6 +324,7 @@ void TextEditorOverlay::paintSelection(QPainter *painter,
             linearGrad.setColorAt(0, col1);
             linearGrad.setColorAt(1, col2);
             painter->setBrush(QBrush(linearGrad));
+        }
     } else {
         painter->setBrush(QBrush());
     }
@@ -311,12 +333,10 @@ void TextEditorOverlay::paintSelection(QPainter *painter,
 
     if (selection.m_dropShadow) {
         painter->save();
-        painter->translate(m_dropShadowWidth, m_dropShadowWidth);
-
-        QPainterPath clip = path;
-        clip.translate(-m_dropShadowWidth, -m_dropShadowWidth);
-        painter->setClipPath(clip.intersected(path));
-        painter->fillPath(path, QColor(0, 0, 0, 100));
+        QPainterPath shadow = path;
+        shadow.translate(m_dropShadowWidth, m_dropShadowWidth);
+        painter->setClipPath(shadow.intersected(path));
+        painter->fillPath(shadow, QColor(0, 0, 0, 100));
         painter->restore();
     }
 

src/plugins/texteditor/texteditoroverlay.h

@@ -59,6 +59,7 @@ private:
 bool m_visible;
 int m_borderWidth;
 int m_dropShadowWidth;
+bool m_alpha;
 
 public:
     TextEditorOverlay(BaseTextEditor *editor);
@@ -74,6 +75,8 @@ public:
 
     void update();
 
+    void setAlpha(bool enabled) { m_alpha = enabled; }
+
     void clear();
     void addOverlaySelection(const QTextCursor &cursor, const QColor &fg, const QColor &bg, bool lockSize = false);
     void addOverlaySelection(int begin, int end, const QColor &fg, const QColor &bg, bool lockSize = false, bool dropShadow = false);