fear: Add hint-trigger for call code completion (#266)

widgets/CompletionHintWidget.cpp

@@ -0,0 +1,83 @@
+/* 
+ * Copyright (C) 2025 Petr Mironychev
+ *
+ * This file is part of QodeAssist.
+ *
+ * QodeAssist is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * QodeAssist is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with QodeAssist. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "CompletionHintWidget.hpp"
+
+#include <QPainter>
+
+#include <utils/theme/theme.h>
+
+namespace QodeAssist {
+
+CompletionHintWidget::CompletionHintWidget(QWidget *parent, int fontSize)
+    : QWidget(parent)
+    , m_isHovered(false)
+{
+    m_accentColor = Utils::creatorTheme()->color(Utils::Theme::TextColorNormal);
+
+    setMouseTracking(true);
+    setFocusPolicy(Qt::NoFocus);
+    setAttribute(Qt::WA_TranslucentBackground);
+    
+    int triangleSize = qMax(6, fontSize / 2);
+    setFixedSize(triangleSize, triangleSize);
+}
+
+void CompletionHintWidget::paintEvent(QPaintEvent *event)
+{
+    Q_UNUSED(event);
+    
+    QPainter painter(this);
+    painter.setRenderHint(QPainter::Antialiasing);
+
+    QColor triangleColor = m_accentColor;
+    triangleColor.setAlpha(m_isHovered ? 255 : 200);
+    
+    painter.setPen(Qt::NoPen);
+    painter.setBrush(triangleColor);
+    
+    QPolygonF triangle;
+    int w = width();
+    int h = height();
+    
+    triangle << QPointF(0, 0)
+             << QPointF(0, h)
+             << QPointF(w, h / 2.0);
+    
+    painter.drawPolygon(triangle);
+}
+
+void CompletionHintWidget::enterEvent(QEnterEvent *event)
+{
+    Q_UNUSED(event);
+    m_isHovered = true;
+    setCursor(Qt::PointingHandCursor);
+    update();
+}
+
+void CompletionHintWidget::leaveEvent(QEvent *event)
+{
+    Q_UNUSED(event);
+    m_isHovered = false;
+    setCursor(Qt::ArrowCursor);
+    update();
+}
+
+} // namespace QodeAssist
+