Add buttons to move split panes

src/public/app/layouts/desktop_layout.js

@@ -75,6 +75,7 @@ import CodeButtonsWidget from "../widgets/floating_buttons/code_buttons.js";
 import ApiLogWidget from "../widgets/api_log.js";
 import HideFloatingButtonsButton from "../widgets/floating_buttons/hide_floating_buttons_button.js";
 import ScriptExecutorWidget from "../widgets/ribbon_widgets/script_executor.js";
+import MovePaneButton from "../widgets/buttons/move_pane_button.js";
 
 export default class DesktopLayout {
     constructor(customWidgets) {
@@ -123,6 +124,8 @@ export default class DesktopLayout {
                                         .child(new NoteIconWidget())
                                         .child(new NoteTitleWidget())
                                         .child(new SpacerWidget(0, 1))
+                                        .child(new MovePaneButton(true))
+                                        .child(new MovePaneButton(false))
                                         .child(new ClosePaneButton())
                                         .child(new CreatePaneButton())
                                     )

src/public/app/widgets/buttons/move_pane_button.js

@@ -0,0 +1,55 @@
+import OnClickButtonWidget from "./onclick_button.js";
+import appContext from "../../components/app_context.js";
+
+export default class MovePaneButton extends OnClickButtonWidget {
+    isEnabled() {
+        if (!super.isEnabled())
+            return false;
+        
+        if (this.isMovingLeft) {
+            // movable if the current context is not a main context, i.e. non-null mainNtxId
+            return !!this.noteContext?.mainNtxId;
+        } else {
+            const currentIndex = appContext.tabManager.noteContexts.findIndex(c => c.ntxId === this.ntxId);
+            const nextContext = appContext.tabManager.noteContexts[currentIndex + 1];
+            // movable if the next context is not null and not a main context, i.e. non-null mainNtxId
+            return !!nextContext?.mainNtxId;
+        }
+    }
+
+    initialRenderCompleteEvent() {
+        this.refresh();
+        super.initialRenderCompleteEvent();
+    }
+
+    async noteContextRemovedEvent({ntxIds}) {
+        this.refresh();
+    }
+
+    async newNoteContextCreatedEvent({noteContext}) {
+        this.refresh();
+    }
+
+    async noteContextSwitchEvent() {
+        this.refresh();
+    }
+
+    async noteContextReorderEvent({ntxIdsInOrder}) {
+        this.refresh();
+    }
+
+    constructor(isMovingLeft) {
+        super();
+
+        this.isMovingLeft = isMovingLeft;
+
+        this.icon(isMovingLeft ? "bx-chevron-left" : "bx-chevron-right")
+            .title(isMovingLeft ? "Move left" : "Move right")
+            .titlePlacement("bottom")
+            .onClick(async (widget, e) => {
+                e.stopPropagation();
+                widget.triggerCommand("moveThisNoteSplit", {ntxId: widget.getClosestNtxId(), isMovingLeft: this.isMovingLeft});
+            })
+            .class("icon-action");
+    }
+}

src/public/app/widgets/containers/split_note_container.js

@@ -1,5 +1,6 @@
 import FlexContainer from "./flex_container.js";
 import appContext from "../../components/app_context.js";
+import NoteContext from "../../components/note_context.js";
 
 export default class SplitNoteContainer extends FlexContainer {
     constructor(widgetFactory) {
@@ -74,6 +75,43 @@ export default class SplitNoteContainer extends FlexContainer {
         appContext.tabManager.removeNoteContext(ntxId);
     }
 
+    async moveThisNoteSplitCommand({ntxId, isMovingLeft}) {
+        if (!ntxId) {
+            logError("empty ntxId!");
+            return;
+        }
+
+        const contexts = appContext.tabManager.noteContexts;
+
+        const currentIndex = contexts.findIndex(c => c.ntxId === ntxId);
+        const otherIndex = currentIndex + (isMovingLeft ? -1 : 1);
+
+        if (currentIndex === -1 || otherIndex < 0 || otherIndex >= contexts.length) {
+            logError("invalid context!");
+            return;
+        }
+
+        if (contexts[currentIndex].isEmpty() && contexts[otherIndex].isEmpty())
+            // no op
+            return;
+
+        const currentId = contexts[currentIndex].ntxId;
+        const currentPath = contexts[currentIndex].notePath;
+        
+        const otherId = contexts[otherIndex].ntxId;
+        const otherPath = contexts[otherIndex].notePath;
+        
+        if (!!currentPath)
+            await appContext.tabManager.switchToNoteContext(otherId, currentPath);
+        if (!!otherPath)
+            await appContext.tabManager.switchToNoteContext(currentId, otherPath);
+
+        // activate context that now contains the original note
+        await appContext.tabManager.activateNoteContext(otherId);
+
+        this.triggerEvent('noteContextSwitch');
+    }
+
     activeContextChangedEvent() {
         this.refresh();
     }