[ui] Controls: add SearchBar component + better keyboard focus handling

* use it in MetadataListView and GraphEditor 'add Node' menu
* GraphEditor: forward MenuItem key events to searchBar to be able to continue editing the filter even if it lost active focus

meshroom/ui/qml/Controls/SearchBar.qml

@@ -0,0 +1,41 @@
+import QtQuick 2.9
+import QtQuick.Controls 2.3
+import QtQuick.Layouts 1.3
+import MaterialIcons 2.2
+
+
+/**
+ * Basic SearchBar component with an appropriate icon and a TextField.
+ */
+FocusScope {
+    property alias textField: field
+    property alias text: field.text
+
+    implicitHeight: childrenRect.height
+    Keys.forwardTo: [field]
+
+    function forceActiveFocus() {
+        field.forceActiveFocus()
+    }
+
+    function clear() {
+        field.clear()
+    }
+
+    RowLayout {
+        width: parent.width
+
+        MaterialLabel {
+            text: MaterialIcons.search
+        }
+
+        TextField {
+            id: field
+            focus: true
+            Layout.fillWidth: true
+            selectByMouse: true
+        }
+    }
+}
+
+

meshroom/ui/qml/Controls/qmldir

@@ -4,3 +4,4 @@ FloatingPane 1.0 FloatingPane.qml
 Group 1.0 Group.qml
 MessageDialog 1.0 MessageDialog.qml
 Panel 1.0 Panel.qml
+SearchBar 1.0 SearchBar.qml

meshroom/ui/qml/GraphEditor/GraphEditor.qml

@@ -142,18 +142,14 @@ Item {
                 if(visible) {
                     // when menu is shown,
                     // clear and give focus to the TextField filter
-                    filterTextField.clear()
-                    filterTextField.forceActiveFocus()
+                    searchBar.clear()
+                    searchBar.forceActiveFocus()
                 }
             }
 
-            TextField {
-                id: filterTextField
-                selectByMouse: true
+            SearchBar {
+                id: searchBar
                 width: parent.width
-                // ensure down arrow give focus to the first MenuItem
-                // (without this, we have to pressed the down key twice to do so)
-                Keys.onDownPressed: nextItemInFocusChain().forceActiveFocus()
             }
 
             Repeater {
@@ -164,24 +160,28 @@ Item {
                     id: menuItemDelegate
                     font.pointSize: 8
                     padding: 3
+
                     // Hide items that does not match the filter text
-                    visible: modelData.toLowerCase().indexOf(filterTextField.text.toLocaleLowerCase()) > -1
+                    visible: modelData.toLowerCase().indexOf(searchBar.text.toLowerCase()) > -1
+                    // Reset menu currentIndex if highlighted items gets filtered out
+                    onVisibleChanged: if(highlighted) newNodeMenu.currentIndex = 0
                     text: modelData
+                    // Forward key events to the search bar to continue typing seamlessly
+                    // even if this delegate took the activeFocus due to mouse hovering
+                    Keys.forwardTo: [searchBar.textField]
                     Keys.onPressed: {
+                        event.accepted = false;
                         switch(event.key)
                         {
                         case Qt.Key_Return:
                         case Qt.Key_Enter:
                             // create node on validation (Enter/Return keys)
-                            newNodeMenu.createNode(modelData)
-                            newNodeMenu.dismiss()
-                            break;
-                        case Qt.Key_Home:
-                            // give focus back to filter
-                            filterTextField.forceActiveFocus()
+                            newNodeMenu.createNode(modelData);
+                            newNodeMenu.close();
+                            event.accepted = true;
                             break;
                         default:
-                            break;
+                            searchBar.textField.forceActiveFocus();
                         }
                     }
                     // Create node on mouse click

meshroom/ui/qml/Viewer/ImageMetadataView.qml

@@ -121,17 +121,9 @@ FloatingPane {
     ColumnLayout {
         anchors.fill: parent
 
-        // Search toolbar
-        RowLayout {
-            Label {
-                text: MaterialIcons.search
-                font.family: MaterialIcons.fontFamily
-            }
-            TextField {
-                id: filter
+        SearchBar {
+            id: searchBar
             Layout.fillWidth: true
-                z: 2
-            }
         }
 
         // Metadata ListView
@@ -148,7 +140,7 @@ FloatingPane {
                 model: metadataModel
                 sortRole: "raw"
                 filterRole: "raw"
-                filterValue: filter.text
+                filterValue: searchBar.text
                 delegate: RowLayout {
                     width: parent.width
                     Label {