Added custom line editor with history

1 files changed, 67 insertions, 0 deletions

diff --git a/gui/line_editor.cc b/gui/line_editor.cc
new file mode 100644
index 00000000..b5ed955f
--- /dev/null
+++ b/gui/line_editor.cc
@@ -0,0 +1,67 @@
+#include "line_editor.h"
+
+#include <QKeyEvent>
+
+LineEditor::LineEditor(QWidget *parent) : QLineEdit(parent), index(0)
+{
+    setContextMenuPolicy(Qt::CustomContextMenu);
+    QAction *clearAction = new QAction("Clear &history", this);
+    clearAction->setStatusTip("Clears line edit history");
+    connect(clearAction, SIGNAL(triggered()), this, SLOT(clearHistory()));
+    contextMenu = createStandardContextMenu();
+    contextMenu->addSeparator();
+    contextMenu->addAction(clearAction);
+
+    connect(this, SIGNAL(returnPressed()), SLOT(textInserted()));
+    connect(this, SIGNAL(customContextMenuRequested(const QPoint)), this,
+            SLOT(showContextMenu(const QPoint)));
+}
+
+void LineEditor::keyPressEvent(QKeyEvent *ev)
+{
+    if (ev->key() == Qt::Key_Up || ev->key() == Qt::Key_Down) {
+        if (lines.empty())
+            return;
+
+        if (ev->key() == Qt::Key_Up)
+            index--;
+        if (ev->key() == Qt::Key_Down)
+            index++;
+
+        if (index < 0)
+            index = 0;
+        if (index >= lines.size()) {
+            index = lines.size();
+            clear();
+            return;
+        }
+        setText(lines[index]);
+    } else if (ev->key() == Qt::Key_Escape) {
+        clear();
+        return;
+    }
+    QLineEdit::keyPressEvent(ev);
+}
+
+void LineEditor::textInserted()
+{
+    if (lines.empty() || lines.back() != text())
+        lines += text();
+    if (lines.size() > 100)
+        lines.removeFirst();
+    index = lines.size();
+    clear();
+    Q_EMIT textLineInserted(lines.back());
+}
+
+void LineEditor::showContextMenu(const QPoint &pt)
+{
+    contextMenu->exec(mapToGlobal(pt));
+}
+
+void LineEditor::clearHistory()
+{
+    lines.clear();
+    index = 0;
+    clear();
+}
\ No newline at end of file