From 4f86bed02e83063d4f852a1003f0e5d44790bf92 Mon Sep 17 00:00:00 2001
From: "Steinar H. Gunderson" <sgunderson@bigfoot.com>
Date: Wed, 9 Jan 2019 22:40:54 +0100
Subject: [PATCH] Only enable the queue button if we can actually queue
 something.

---
 futatabi/mainwindow.cpp | 30 ++++++++++++++++++++++++++++++
 futatabi/mainwindow.h   |  1 +
 2 files changed, 31 insertions(+)

diff --git a/futatabi/mainwindow.cpp b/futatabi/mainwindow.cpp
index 4a4c0d6..b39d8d4 100644
--- a/futatabi/mainwindow.cpp
+++ b/futatabi/mainwindow.cpp
@@ -203,6 +203,7 @@ MainWindow::MainWindow()
 
 	connect(ui->clip_list->selectionModel(), &QItemSelectionModel::currentChanged,
 	        this, &MainWindow::clip_list_selection_changed);
+	enable_or_disable_queue_button();
 
 	// Find out how many cameras we have in the existing frames;
 	// if none, we start with two cameras.
@@ -285,6 +286,7 @@ void MainWindow::cue_in_clicked()
 	QModelIndex index = cliplist_clips->index(cliplist_clips->size() - 1, int(ClipList::Column::IN));
 	ui->clip_list->selectionModel()->setCurrentIndex(index, QItemSelectionModel::ClearAndSelect);
 	ui->clip_list->scrollToBottom();
+	enable_or_disable_queue_button();
 }
 
 void MainWindow::cue_out_clicked()
@@ -300,10 +302,13 @@ void MainWindow::cue_out_clicked()
 	QModelIndex index = cliplist_clips->index(cliplist_clips->size() - 1, int(ClipList::Column::OUT));
 	ui->clip_list->selectionModel()->setCurrentIndex(index, QItemSelectionModel::ClearAndSelect);
 	ui->clip_list->scrollToBottom();
+	enable_or_disable_queue_button();
 }
 
 void MainWindow::queue_clicked()
 {
+	// See also enable_or_disable_queue_button().
+
 	if (cliplist_clips->empty()) {
 		return;
 	}
@@ -846,6 +851,7 @@ void MainWindow::clip_list_selection_changed(const QModelIndex &current, const Q
 		camera_selected = current.column() - int(ClipList::Column::CAMERA_1);
 	}
 	highlight_camera_input(camera_selected);
+	enable_or_disable_queue_button();
 }
 
 void MainWindow::report_disk_space(off_t free_bytes, double estimated_seconds_left)
@@ -1057,6 +1063,30 @@ void MainWindow::enable_or_disable_preview_button()
 	ui->preview_btn->setEnabled(!cliplist_clips->empty());
 }
 
+void MainWindow::enable_or_disable_queue_button()
+{
+	// Follows the logic in queue_clicked().
+	// TODO: Perhaps only enable this if something is actually selected.
+
+	bool enabled;
+
+	if (cliplist_clips->empty()) {
+		enabled = false;
+	} else {
+		QItemSelectionModel *selected = ui->clip_list->selectionModel();
+		if (!selected->hasSelection()) {
+			Clip clip = *cliplist_clips->back();
+			enabled = clip.pts_out != -1;
+		} else {
+			QModelIndex index = selected->currentIndex();
+			Clip clip = *cliplist_clips->clip(index.row());
+			enabled = clip.pts_out != -1;
+		}
+	}
+
+	ui->queue_btn->setEnabled(enabled);
+}
+
 void MainWindow::set_output_status(const string &status)
 {
 	ui->live_label->setText(QString::fromStdString("Current output (" + status + ")"));
diff --git a/futatabi/mainwindow.h b/futatabi/mainwindow.h
index d7e037c..3628bf4 100644
--- a/futatabi/mainwindow.h
+++ b/futatabi/mainwindow.h
@@ -139,6 +139,7 @@ private:
 
 	void highlight_camera_input(int stream_idx);
 	void enable_or_disable_preview_button();
+	void enable_or_disable_queue_button();
 
 	template<class Model>
 	void replace_model(QTableView *view, Model **model, Model *new_model);
-- 
2.39.2