feat(StatusChatListAndCategories): add drag and drop support for cate… (#349)

* feat(StatusChatListAndCategories): add drag and drop support for categories

This adds support for dragging and dropping chat list categories.
To persist reorder of chat categories, the new `onChatListCategoryReordered`
signal can be leveraged.

Drag and drop of categories is turned off by default and needs to
be turned on using `draggableCategories: true`.

Closes #227

* feat(Status.Core): introduce Utils namespace

This adds a new package for utility related things.

README.md

@@ -9,6 +9,7 @@ These modules are:
 
 - [StatusQ.Core](https://github.com/status-im/StatusQ/blob/master/src/StatusQ/Core/qmldir)
 - [StatusQ.Core.Theme](https://github.com/status-im/StatusQ/blob/master/src/StatusQ/Core/Theme/qmldir)
+- [StatusQ.Core.Utils](https://github.com/status-im/StatusQ/blob/master/src/StatusQ/Core/Utils/qmldir)
 - [StatusQ.Components](https://github.com/status-im/StatusQ/blob/master/src/StatusQ/Controls/qmldir)
 - [StatusQ.Controls](https://github.com/status-im/StatusQ/blob/master/src/StatusQ/Components/qmldir)
 - [StatusQ.Layout](https://github.com/status-im/StatusQ/blob/master/src/StatusQ/Layout/qmldir)

sandbox/DemoApp.qml

@@ -468,6 +468,7 @@ Rectangle {
                         height: implicitHeight > (leftPanel.height - 64) ? implicitHeight + 8 : leftPanel.height - 64
 
                         draggableItems: true
+                        draggableCategories: false
                         chatList.model: models.demoCommunityChatListItems
                         categoryList.model: models.demoCommunityCategoryItems
 

sandbox/Models.qml

@@ -113,10 +113,12 @@ CExPynn1gWf9bx498P7/nzPcxEzGExhBdJGYihtAYQlO+tUZvqrPbqeudo5iJGEJjCE15a3VtodH3q2I
         ListElement {
             categoryId: "public"
             name: "Public"
+            position: 0
         }
         ListElement {
             categoryId: "dev"
             name: "Development"
+            position: 1
         }
     }
 

src/StatusQ/Components/StatusChatList.qml

@@ -4,6 +4,7 @@ import QtQuick.Controls 2.13 as QC
 
 import StatusQ.Core 0.1
 import StatusQ.Core.Theme 0.1
+import StatusQ.Core.Utils 0.1
 import StatusQ.Components 0.1
 import StatusQ.Controls 0.1
 
@@ -28,18 +29,6 @@ Column {
     signal chatItemUnmuted(string id)
     signal chatItemReordered(string id, int from, int to)
 
-    function getAbsolutePosition(node) {
-        var returnPos = {};
-        returnPos.x = 0;
-        returnPos.y = 0;
-        if (node !== undefined && node !== null) {
-            var parentValue = getAbsolutePosition(node.parent);
-            returnPos.x = parentValue.x + node.x;
-            returnPos.y = parentValue.y + node.y;
-        }
-        return returnPos;
-    }
-
     onPopupMenuChanged: {
         if (!!popupMenu) {
             popupMenuSlot.sourceComponent = popupMenu
@@ -192,7 +181,7 @@ Column {
                 id: draggedListItemLoader
                 active: dragSensor.active
                 sourceComponent: StatusChatListItem {
-                    property var globalPosition: statusChatList.getAbsolutePosition(draggable)
+                    property var globalPosition: Utils.getAbsolutePosition(draggable)
                     parent: QC.Overlay.overlay
                     sensor.cursorShape: dragSensor.cursorShape
                     Drag.active: dragSensor.active

src/StatusQ/Components/StatusChatListAndCategories.qml

@@ -1,6 +1,8 @@
 import QtQuick 2.14
-import QtQuick.Controls 2.14
+import QtQml.Models 2.14
+import QtQuick.Controls 2.14 as QC
 
+import StatusQ.Core.Utils 0.1
 import StatusQ.Components 0.1
 import StatusQ.Popups 0.1
 
@@ -14,9 +16,10 @@ Item {
     property bool showCategoryActionButtons: false
     property bool showPopupMenu: true
     property alias chatList: statusChatList.chatListItems
-    property alias categoryList: statusChatListCategories
+    property alias categoryList: delegateModel
     property alias sensor: sensor
     property bool draggableItems: false
+    property bool draggableCategories: false
 
     property Component categoryPopupMenu
     property Component chatListPopupMenu
@@ -25,6 +28,7 @@ Item {
     signal chatItemSelected(string id)
     signal chatItemUnmuted(string id)
     signal chatItemReordered(string categoryId, string chatId, int from, int to)
+    signal chatListCategoryReordered(string categoryId, int from, int to)
     signal categoryAddButtonClicked(string id)
 
     onPopupMenuChanged: {
@@ -66,14 +70,58 @@ Item {
                     return !!!model.categoryId
                 }
                 popupMenu: statusChatListAndCategories.chatListPopupMenu
-
             }
 
-            Repeater {
+            DelegateModel {
-                id: statusChatListCategories
+                id: delegateModel
-                visible: !!model && model.count > 0
 
-                delegate: StatusChatListCategory {
+                delegate: Item {
+                    id: draggable
+                    width: statusChatListCategory.width
+                    height: statusChatListCategory.height
+
+                    property alias chatListCategory: statusChatListCategory
+
+                    StatusChatListCategory {
+                        id: statusChatListCategory
+
+                        property bool dragActive: false
+                        property real startY: 0
+                        property real startX: 0
+                      
+                        opacity: dragActive ? 0.0 : 1.0
+
+                        dragSensor.drag.target: draggedListCategoryLoader.item
+                        dragSensor.drag.threshold: 0.1
+                        dragSensor.drag.filterChildren: true
+                        dragSensor.onPressAndHold: {
+                            if (statusChatListAndCategories.draggableCategories) {
+                                dragActive = true
+                            }
+                        }
+                        dragSensor.onReleased: {
+                            if (dragActive) {
+                                statusChatListAndCategories.chatListCategoryReordered(statusChatListCategory.categoryId, statusChatListCategory.originalOrder, statusChatListCategory.originalOrder)
+                            }
+                            dragActive = false
+                        }
+                        dragSensor.cursorShape: dragActive ? Qt.ClosedHandCursor : Qt.PointingHandCursor
+                        dragSensor.onPressed: {
+                            startY = dragSensor.mouseY
+                            startX = dragSensor.mouseX
+                        }
+                        dragSensor.onMouseYChanged: {
+                            if (statusChatListAndCategories.draggableCategories && (Math.abs(startY - dragSensor.mouseY) > 1) && dragSensor.pressed) {
+                                dragActive = true
+                            }
+                        }
+                        dragSensor.onMouseXChanged: {
+                            if (statusChatListAndCategories.draggableCategories && (Math.abs(startX - dragSensor.mouseX) > 1) && dragSensor.pressed) {
+                                dragActive = true
+                            }
+                        }
+
+                        originalOrder: model.position
                         categoryId: model.categoryId
                         name: model.name
                         showActionButtons: statusChatListAndCategories.showCategoryActionButtons
@@ -89,6 +137,63 @@ Item {
                         popupMenu: statusChatListAndCategories.categoryPopupMenu
                         chatListPopupMenu: statusChatListAndCategories.chatListPopupMenu
                     }
+
+                    DropArea {
+                        id: dropArea
+                        width: draggable.chatListCategory.dragActive ? 0 : parent.width
+                        height: draggable.chatListCategory.dragActive ? 0 : parent.height
+                        keys: ["chat-category"]
+
+                        onEntered: reorderDelay.start()
+                        onDropped: statusChatListAndCategories.chatListCategoryReordered(statusChatListCategory.categoryId, drag.source.originalOrder, statusChatListCategory.DelegateModel.itemsIndex)
+
+                        Timer {
+                            id: reorderDelay
+                            interval: 100
+                            repeat: false
+                            onTriggered: {
+                                if (dropArea.containsDrag) {
+                                    dropArea.drag.source.chatListCategory.originalOrder = statusChatListCategory.originalOrder
+                                    delegateModel.items.move(dropArea.drag.source.DelegateModel.itemsIndex, draggable.DelegateModel.itemsIndex)
+                                }
+                            }
+                        }
+                    }
+
+                    Loader {
+                        id: draggedListCategoryLoader
+                        active: draggable.chatListCategory.dragActive
+                        sourceComponent: StatusChatListCategory {
+                            property var globalPosition: Utils.getAbsolutePosition(draggable)
+                            parent: QC.Overlay.overlay
+
+                            dragSensor.cursorShape: draggable.chatListCategory.dragSensor.cursorShape
+                            Drag.active: draggable.chatListCategory.dragActive
+                            Drag.hotSpot.x: width / 2
+                            Drag.hotSpot.y: height / 2
+                            Drag.keys: ["chat-category"]
+                            Drag.source: draggable
+
+                            Component.onCompleted: {
+                                x = globalPosition.x
+                                y = globalPosition.y
+                            }
+                            dragged: true
+                            categoryId: draggable.chatListCategory.categoryId
+                            name: draggable.chatListCategory.name
+                            showActionButtons: draggable.chatListCategory.showActionButtons
+
+                            chatList.chatListItems.model: draggable.chatListCategory.chatList.chatListItems.model
+                            chatList.selectedChatId: draggable.chatListCategory.chatList.selectedChatId
+                        }
+                    }
+                }
+            }
+
+            Repeater {
+                id: statusChatListCategories
+                visible: !!model && model.count > 0
+                model: delegateModel
             }
         }
     }

src/StatusQ/Components/StatusChatListCategory.qml

@@ -7,16 +7,21 @@ Column {
     id: statusChatListCategory
 
     spacing: 0
+    opacity: dragged ? 0.5 : 1
 
+    objectName: "chatListCategory"
+    property int originalOrder: -1
     property string categoryId: ""
     property string name: ""
     property bool opened: true
+    property bool dragged: false
 
     property alias showActionButtons: statusChatListCategoryItem.showActionButtons
     property alias addButton: statusChatListCategoryItem.addButton
     property alias menuButton: statusChatListCategoryItem.menuButton
     property alias toggleButton: statusChatListCategoryItem.toggleButton
     property alias chatList: statusChatList
+    property alias dragSensor: statusChatListCategoryItem.sensor
 
     property Component chatListPopupMenu
     property Component popupMenu
@@ -31,9 +36,11 @@ Column {
         id: statusChatListCategoryItem
         title: statusChatListCategory.name
         opened: statusChatListCategory.opened
+        sensor.pressAndHoldInterval: 150
 
         showMenuButton: showActionButtons && !!statusChatListCategory.popupMenu
 
+        highlighted: statusChatListCategory.dragged
         sensor.onClicked: {
             if (mouse.button === Qt.RightButton && showActionButtons && !!statusChatListCategory.popupMenu) {
                 highlighted = true

src/StatusQ/Core/Utils/Utils.qml

@@ -0,0 +1,19 @@
+pragma Singleton
+
+import QtQuick 2.13
+
+QtObject {
+    function getAbsolutePosition(node) {
+        var returnPos = {};
+        returnPos.x = 0;
+        returnPos.y = 0;
+        if (node !== undefined && node !== null) {
+            var parentValue = getAbsolutePosition(node.parent);
+            returnPos.x = parentValue.x + node.x;
+            returnPos.y = parentValue.y + node.y;
+        }
+        return returnPos;
+    }
+}
+
+

src/StatusQ/Core/Utils/qmldir

@@ -0,0 +1,4 @@
+module StatusQ.Core.Utils
+
+singleton Utils 0.1 Utils.qml
+

statusq.qrc

@@ -7,6 +7,7 @@
         <file>src/StatusQ/Core/Theme/Theme.qml</file>
         <file>src/StatusQ/Core/Theme/qmldir</file>
         <file>src/StatusQ/Core/Theme/StatusColors.qml</file>
+        <file>src/StatusQ/Core/Utils/Utils.qml</file>
         <file>src/StatusQ/Core/StatusIcon.qml</file>
         <file>src/StatusQ/Core/StatusImageSettings.qml</file>
         <file>src/StatusQ/Core/StatusIconSettings.qml</file>