frontend: Replace add source dropdown with dialog

Co-Authored-By: Lain <134130700+Lain-B@users.noreply.github.com>

frontend/components/FlowFrame.cpp

@@ -0,0 +1,134 @@
+/******************************************************************************
+    Copyright (C) 2025 by Taylor Giampaolo <warchamp7@obsproject.com>
+
+    This program 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 2 of the License, or
+    (at your option) any later version.
+
+    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+******************************************************************************/
+
+#include <components/FlowFrame.hpp>
+
+#include <QKeyEvent>
+#include <QScrollArea>
+
+FlowFrame::FlowFrame(QWidget *parent) : QFrame(parent)
+{
+	layout = new FlowLayout(this);
+	setLayout(layout);
+}
+
+void FlowFrame::keyPressEvent(QKeyEvent *event)
+{
+	QWidget *focused = focusWidget();
+	if (!focused) {
+		return;
+	}
+
+	int index = -1;
+	for (int i = 0; i < layout->count(); ++i) {
+		if (!layout->itemAt(i)->widget()) {
+			continue;
+		}
+
+		auto focusProxy = layout->itemAt(i)->widget()->focusProxy();
+		if (layout->itemAt(i)->widget() == focused || focusProxy == focused) {
+			if (focusProxy == focused) {
+				focused = layout->itemAt(i)->widget();
+			}
+
+			index = i;
+			break;
+		}
+	}
+
+	if (index == -1) {
+		return;
+	}
+
+	const QRect focusedRect = focused->geometry();
+	QWidget *nextFocus = nullptr;
+
+	switch (event->key()) {
+	case Qt::Key_Right:
+	case Qt::Key_Down:
+	case Qt::Key_Left:
+	case Qt::Key_Up: {
+		// Find next widget in the given direction
+		int bestDistance = INT_MAX;
+		for (int i = 0; i < layout->count(); ++i) {
+			if (i == index) {
+				continue;
+			}
+
+			QWidget *widget = layout->itemAt(i)->widget();
+			const QRect rect = widget->geometry();
+
+			bool isCandidate = false;
+			int distance = INT_MAX;
+
+			switch (event->key()) {
+			case Qt::Key_Right:
+				if (rect.left() > focusedRect.right()) {
+					distance = (rect.left() - focusedRect.right()) +
+						   qAbs(rect.center().y() - focusedRect.center().y());
+					isCandidate = true;
+				}
+				break;
+			case Qt::Key_Left:
+				if (rect.right() < focusedRect.left()) {
+					distance = (focusedRect.left() - rect.right()) +
+						   qAbs(rect.center().y() - focusedRect.center().y());
+					isCandidate = true;
+				}
+				break;
+			case Qt::Key_Down:
+				if (rect.top() > focusedRect.bottom()) {
+					distance = (rect.top() - focusedRect.bottom()) +
+						   qAbs(rect.center().x() - focusedRect.center().x());
+					isCandidate = true;
+				}
+				break;
+			case Qt::Key_Up:
+				if (rect.bottom() < focusedRect.top()) {
+					distance = (focusedRect.top() - rect.bottom()) +
+						   qAbs(rect.center().x() - focusedRect.center().x());
+					isCandidate = true;
+				}
+				break;
+			}
+
+			if (isCandidate && distance < bestDistance) {
+				bestDistance = distance;
+				nextFocus = widget;
+			}
+		}
+		break;
+	}
+	default:
+		QWidget::keyPressEvent(event);
+		return;
+	}
+
+	if (nextFocus) {
+		nextFocus->setFocus();
+
+		QWidget *scrollParent = nextFocus->parentWidget();
+		while (scrollParent) {
+			QScrollArea *scrollArea = qobject_cast<QScrollArea *>(scrollParent);
+			if (scrollArea) {
+				scrollArea->ensureWidgetVisible(nextFocus, 20, 20);
+				break;
+			}
+			scrollParent = scrollParent->parentWidget();
+		}
+	}
+}