The editor now has context aware completions

pglab/codeeditor/CompletionPopup.h

@@ -0,0 +1,40 @@
+#ifndef COMPLETIONPOPUP_H
+#define COMPLETIONPOPUP_H
+
+#include <QListWidget>
+#include <functional>
+#include <vector>
+
+struct EditorCompletionItem {
+	QString display;
+	QString detail;
+	QString insertText;
+	bool ambiguous = false;
+};
+
+struct EditorCompletionResult {
+	int replaceStart = 0;
+	int replaceLen = 0;
+	bool hasQualifier = false; // completing behind "name."
+	std::vector<EditorCompletionItem> items;
+};
+
+/// Callback that determines the completions for a cursor position in the text
+using EditorCompletionCallback = std::function<EditorCompletionResult(const QString &text, int cursorPos)>;
+
+/// List shown below the cursor, it never takes keyboard focus so typing continues in the editor.
+class CompletionPopup : public QListWidget {
+	Q_OBJECT
+public:
+	explicit CompletionPopup(QWidget *parent);
+
+	void setItems(const std::vector<EditorCompletionItem> &items);
+	void moveSelection(int delta);
+	int currentRow() const { return QListWidget::currentRow(); }
+	void showAt(const QPoint &globalPos);
+
+signals:
+	void itemAccepted(int row);
+};
+
+#endif // COMPLETIONPOPUP_H