qcam: Don't ask for a camera when only one exists

If there is only one camera exposed by libcamera, there is little value
in asking the user to choose it.

Automatically select it, and remove the need to ask the user to select
'ok' from a Dialog box.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

2 files changed, 26 insertions, 15 deletions

diff --git a/src/qcam/main_window.cpp b/src/qcam/main_window.cpp
index ef4ad4a2..3d563092 100644
--- a/src/qcam/main_window.cpp
+++ b/src/qcam/main_window.cpp
@@ -66,27 +66,37 @@ void MainWindow::updateTitle()
 	setWindowTitle(title_ + " : " + QString::number(fps, 'f', 2) + " fps");
 }
 
-int MainWindow::openCamera(CameraManager *cm)
+std::string MainWindow::chooseCamera(CameraManager *cm)
 {
-	std::string cameraName;
+	QStringList cameras;
+	bool result;
+
+	if (cm->cameras().size() == 1)
+		return cm->cameras()[0]->name();
 
-	if (!options_.isSet(OptCamera)) {
-		QStringList cameras;
-		bool result;
+	for (const std::shared_ptr<Camera> &cam : cm->cameras())
+		cameras.append(QString::fromStdString(cam->name()));
 
-		for (const std::shared_ptr<Camera> &cam : cm->cameras())
-			cameras.append(QString::fromStdString(cam->name()));
+	QString name = QInputDialog::getItem(this, "Select Camera",
+					     "Camera:", cameras, 0,
+					     false, &result);
+	if (!result)
+		return std::string();
 
-		QString name = QInputDialog::getItem(this, "Select Camera",
-						     "Camera:", cameras, 0,
-						     false, &result);
-		if (!result)
-			return -EINVAL;
+	return name.toStdString();
+}
 
-		cameraName = name.toStdString();
-	} else {
+int MainWindow::openCamera(CameraManager *cm)
+{
+	std::string cameraName;
+
+	if (options_.isSet(OptCamera))
 		cameraName = static_cast<std::string>(options_[OptCamera]);
-	}
+	else
+		cameraName = chooseCamera(cm);
+
+	if (cameraName == "")
+		return -EINVAL;
 
 	camera_ = cm->get(cameraName);
 	if (!camera_) {
diff --git a/src/qcam/main_window.h b/src/qcam/main_window.h
index 6873155a..30dd8743 100644
--- a/src/qcam/main_window.h
+++ b/src/qcam/main_window.h
@@ -43,6 +43,7 @@ private Q_SLOTS:
 	void updateTitle();
 
 private:
+	std::string chooseCamera(CameraManager *cm);
 	int openCamera(CameraManager *cm);
 
 	int startCapture();