[ui] basic sequence player: control selected viewId with a slider

meshroom/ui/qml/Viewer/SequencePlayer.qml

@@ -0,0 +1,45 @@
+import QtQuick 2.11
+import QtQuick.Controls 2.0
+
+Slider {
+
+    function sequence(vps) {
+        let objs = []
+        for (let i = 0; i < vps.count; i++) {
+            objs.push({
+                viewId: m.viewpoints.at(i).childAttribute("viewId").value,
+                filename: Filepath.basename(m.viewpoints.at(i).childAttribute("path").value)
+            });
+        }
+        objs.sort((a, b) => { return a.filename < b.filename ? -1 : 1; });
+
+        let viewIds = [];
+        for (let i = 0; i < objs.length; i++) {
+            viewIds.push(objs[i].viewId);
+        }
+
+        return viewIds;
+    }
+
+    QtObject {
+        id: m
+        property var currentCameraInit: _reconstruction && _reconstruction.cameraInit ? _reconstruction.cameraInit : undefined
+        property var viewpoints: currentCameraInit ? currentCameraInit.attribute('viewpoints').value : undefined
+        property var sortedViewIds: viewpoints ? sequence(viewpoints) : []
+    }
+
+    stepSize: 1
+    snapMode: Slider.SnapAlways
+    live: true
+
+    from: 0
+    to: Math.max(m.sortedViewIds.length, 1)
+
+    onValueChanged: {
+        let idx = Math.floor(value);
+        if (_reconstruction && idx >= 0 && idx < m.sortedViewIds.length - 1) {
+            _reconstruction.selectedViewId = m.sortedViewIds[idx];
+        }
+    }
+
+}

meshroom/ui/qml/Viewer/Viewer2D.qml

@@ -1296,6 +1296,10 @@ FocusScope {
 
                     }
                 }
+
+                FloatingPane {
+                    SequencePlayer {}
+                }
             }
         }
     }