From 5a6248518654ec97d95d2c463e3ffb4be7bbf456 Mon Sep 17 00:00:00 2001
From: Your Name <you@example.com>
Date: Thu, 13 May 2021 17:20:26 -0400
Subject: Initial commit

---
 src/ui.cc | 115 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 src/ui.cc

(limited to 'src/ui.cc')

diff --git a/src/ui.cc b/src/ui.cc
new file mode 100644
index 0000000..3d0e193
--- /dev/null
+++ b/src/ui.cc
@@ -0,0 +1,115 @@
+#include "ui.h"
+#include "playback.h"
+#include "labeller.h"
+#include <opencv2/opencv.hpp>
+#include <iostream>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+namespace frontend {
+    struct ui_impl {
+        std::shared_ptr<playback> pb;
+        std::shared_ptr<backend::labeller> llr;
+        bool play = true;
+        bool stalePrintout = true;
+    };
+
+    ui::ui(std::shared_ptr<playback> playback, std::shared_ptr<backend::labeller> labeller) {
+        data = std::shared_ptr<ui_impl>(new ui_impl);
+        data->pb = playback;
+        data->llr = labeller;
+    }
+
+    bool handleKey(int keycode, const std::shared_ptr<ui_impl>& data) {
+        if(keycode != -1) {
+            data->stalePrintout = true;
+            if(keycode >= 48 && keycode <= 57) { // Number -> label
+                std::size_t num = keycode - 48;
+                if(num < data->llr->getLabels().size()) {
+                    data->llr->applyLabel(data->llr->getLabels()[num], data->pb->getTime());
+                }
+            } else {
+                switch(keycode) {
+                    case 27: // Escape quits
+                        std::cout << std::endl;
+                        return true;
+                    case 32: // Space pauses
+                        data->play = ! data->play;
+                        break;
+                    case 65361: // Left seeks backward 1 frame
+                        data->pb->seekFrame(data->pb->getFrame() - 1);
+                        break;
+                    case 65362: // Up seeks backward 1 second
+                        if(data->pb->getTime() < 1) {
+                            data->pb->seekTime(data->pb->getTime() * -1);
+                        } else {
+                            data->pb->seekTime(data->pb->getTime() - 1);
+                        }
+                        break;
+                    case 65363: // Right seeks forward 1 frame
+                        data->pb->seekFrame(data->pb->getFrame() + 1);
+                        break;
+                    case 65364: // Down seeks forward 1 second
+                        data->pb->seekTime(data->pb->getTime() + 1);
+                        break;
+                    case 117: // u undoes
+                        data->llr->undo();
+                        break;
+                    case 114: // r redoes
+                        data->llr->redo();
+                        break;
+                    case 65535: // DEL deletes
+                        data->llr->deleteLabel(data->pb->getTime());
+                        break;
+                    case 115: // s saves
+                        data->llr->save();
+                        break;
+                    default:
+                        std::cout << "Pressed the " << keycode << " key" << std::endl;
+                        break;
+                }
+            }
+        }
+        return false;
+    }
+
+    void ui::begin() {
+        std::cout << "Playing a video that's " << data->pb->getMaxFrame() << " frames (" << data->pb->getMaxTime() << " seconds) long." << std::endl;
+        std::cout << "Annotations:" << std::endl;
+        int num = 0;
+        for(auto ann : data->llr->getLabels()) {
+            std::cout << num++ << ": " << ann << std::endl;
+        }
+        // Get window size
+        struct winsize size;
+        ioctl(STDOUT_FILENO, TIOCGWINSZ, &size);
+        int cols = size.ws_col;
+        while(true) {
+            data->pb->display("Video");
+            data->pb->interFrameSleep();
+            if(handleKey(cv::pollKey(), data)) {
+                break;
+            }
+            if(data->play) {
+                data->pb->seekFrame(data->pb->getFrame() + 1);
+            }
+            if(data->play || data->stalePrintout) {
+                std::stringstream toPrint;
+                toPrint << "Frame: " << data->pb->getFrame() << " (" << std::setprecision(4) << std::setw(6) << std::left << data->pb->getTime() << " s)";
+                std::string timeString = toPrint.str();
+                toPrint.str(""); // clear contents
+                // Get surrounding labels
+                auto labs = data->llr->getSurrounding(data->pb->getTime());
+                if(! labs.first.name.empty()) toPrint << labs.first.name << " (t=" << std::setprecision(4) << labs.first.time << ")";
+                else toPrint << "START (t=0)";
+                toPrint << " CURRENT ";
+                if(! labs.second.name.empty()) toPrint << labs.second.name << " (t=" << std::setprecision(4) << labs.second.time << ")";
+                else toPrint << "END (t=" << data->pb->getMaxTime() << ")";
+                toPrint << std::string(cols - toPrint.str().size() - timeString.size() - 1, ' ') << timeString;
+                std::cout << "\r\b\r" << toPrint.str();
+                std::cout.flush();
+                data->stalePrintout = false;
+            }
+        }
+    }
+}
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