Fix eclipse-theia#9203: Drag and drop sections between views

Signed-off-by: Esther Perelman <[email protected]>
EstherPerelman · Sep 9, 2021 · 5426df7 · 5426df7
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Showing 18 changed files with 647 additions and 122 deletions.
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -9,6 +9,7 @@
 - [core] added `BreadcrumbsRendererFactory` to constructor arguments of `DockPanelRenderer` and `ToolbarAwareTabBar`. [#9920](https://github.com/eclipse-theia/theia/pull/9920)
 - [task] `TaskDefinition.properties.required` is now optional to align with the specification [#10015](https://github.com/eclipse-theia/theia/pull/10015)
 - [core] `setTopPanelVisibily` renamed to `setTopPanelVisibility` [#10020](https://github.com/eclipse-theia/theia/pull/10020)
+- [view-container] `ViewContainerPart` constructor takes new 2 parameters: `originalContainerId` and `originalContainerTitle`. The existing `viewContainerId` parameter has been renamed to `currentContainerId` to enable drag & drop views. [#9644](https://github.com/eclipse-theia/theia/pull/9644)
 
 ## v1.17.2 - 9/1/2021
 

diff --git a/packages/core/src/browser/shell/application-shell.ts b/packages/core/src/browser/shell/application-shell.ts
@@ -59,7 +59,9 @@ export type ApplicationShellLayoutVersion =
     /** git history view is replaced by a more generic scm history view, backward compatible to 3.0 */
     4.0 |
     /** Replace custom/font-awesome icons with codicons */
-    5.0;
+    5.0 |
+    /** added the ability to drag and drop view parts between view containers */
+    6.0;
 
 /**
  * When a version is increased, make sure to introduce a migration (ApplicationShellLayoutMigration) to this version.

diff --git a/packages/core/src/browser/shell/tab-bars.ts b/packages/core/src/browser/shell/tab-bars.ts
@@ -30,6 +30,7 @@ import { TabBarDecoratorService } from './tab-bar-decorator';
 import { IconThemeService } from '../icon-theme-service';
 import { BreadcrumbsRenderer, BreadcrumbsRendererFactory } from '../breadcrumbs/breadcrumbs-renderer';
 import { NavigatableWidget } from '../navigatable-types';
+import { IDragEvent } from '@phosphor/dragdrop';
 
 /** The class name added to hidden content nodes, which are required to render vertical side bars. */
 const HIDDEN_CONTENT_CLASS = 'theia-TabBar-hidden-content';
@@ -772,6 +773,18 @@ export class SideTabBar extends ScrollableTabBar {
     protected onAfterAttach(msg: Message): void {
         super.onAfterAttach(msg);
         this.renderTabBar();
+        this.node.addEventListener('p-dragenter', this);
+        this.node.addEventListener('p-dragover', this);
+        this.node.addEventListener('p-dragleave', this);
+        document.addEventListener('p-drop', this);
+    }
+
+    protected onAfterDetach(msg: Message): void {
+        super.onAfterDetach(msg);
+        this.node.removeEventListener('p-dragenter', this);
+        this.node.removeEventListener('p-dragover', this);
+        this.node.removeEventListener('p-dragleave', this);
+        document.removeEventListener('p-drop', this);
     }
 
     protected onUpdateRequest(msg: Message): void {
@@ -869,6 +882,15 @@ export class SideTabBar extends ScrollableTabBar {
                 this.onMouseMove(event as MouseEvent);
                 super.handleEvent(event);
                 break;
+            case 'p-dragenter':
+                this.onDragEnter(event as IDragEvent);
+                break;
+            case 'p-dragover':
+                this.onDragOver(event as IDragEvent);
+                break;
+            case 'p-dragleave': case 'p-drop':
+                this.cancelViewContainerDND();
+                break;
             default:
                 super.handleEvent(event);
         }
@@ -934,4 +956,78 @@ export class SideTabBar extends ScrollableTabBar {
         }
     }
 
+    toCancelViewContainerDND = new DisposableCollection();
+    protected cancelViewContainerDND = () => {
+        this.toCancelViewContainerDND.dispose();
+    };
+
+    /**
+     * handles `viewContainerPart` drag enter.
+     */
+    protected onDragEnter = (event: IDragEvent) => {
+        this.cancelViewContainerDND();
+        if (event.mimeData.getData('application/vnd.phosphor.view-container-factory')) {
+            event.preventDefault();
+            event.stopPropagation();
+        }
+    };
+
+    /**
+     * Handle `viewContainerPart` drag over,
+     * Defines the appropriate `drpAction` and opens the tab on which the mouse stands on for more than 800 ms.
+     */
+    protected onDragOver = (event: IDragEvent) => {
+        const factory = event.mimeData.getData('application/vnd.phosphor.view-container-factory');
+        const widget = factory && factory();
+        if (!widget) {
+            event.dropAction = 'none';
+            return;
+        }
+        event.preventDefault();
+        event.stopPropagation();
+        if (!this.toCancelViewContainerDND.disposed) {
+            event.dropAction = event.proposedAction;
+            return;
+        }
+
+        const { target, clientX, clientY } = event;
+        if (target instanceof HTMLElement) {
+            if (widget.options.disableDraggingToOtherContainers || widget.viewContainer.disableDNDBetweenContainers) {
+                event.dropAction = 'none';
+                target.classList.add('theia-cursor-no-drop');
+                this.toCancelViewContainerDND.push(Disposable.create(() => {
+                    target.classList.remove('theia-cursor-no-drop');
+                }));
+            } else {
+                event.dropAction = event.proposedAction;
+            }
+            const { top, bottom, left, right, height } = target.getBoundingClientRect();
+            const mouseOnTop = (clientY - top) < (height / 2);
+            const dropTargetClass = `drop-target-${mouseOnTop ? 'top' : 'bottom'}`;
+            const tabs = this.contentNode.children;
+            const targetTab = ArrayExt.findFirstValue(tabs, t => ElementExt.hitTest(t, clientX, clientY));
+            if (!targetTab) {
+                return;
+            }
+            targetTab.classList.add(dropTargetClass);
+            this.toCancelViewContainerDND.push(Disposable.create(() => {
+                if (targetTab) {
+                    targetTab.classList.remove(dropTargetClass);
+                }
+            }));
+            const openTabTimer = setTimeout(() => {
+                const title = this.titles.find(t => (this.renderer as TabBarRenderer).createTabId(t) === targetTab.id);
+                if (title) {
+                    const mouseStillOnTab = clientX >= left && clientX <= right && clientY >= top && clientY <= bottom;
+                    if (mouseStillOnTab) {
+                        this.currentTitle = title;
+                    }
+                }
+            }, 800);
+            this.toCancelViewContainerDND.push(Disposable.create(() => {
+                clearTimeout(openTabTimer);
+            }));
+        }
+    };
+
 }
diff --git a/packages/core/src/browser/style/index.css b/packages/core/src/browser/style/index.css
@@ -235,6 +235,10 @@ button.secondary[disabled], .theia-button.secondary[disabled] {
     z-index: 999;
 }
 
+.theia-cursor-no-drop, .theia-cursor-no-drop:active {
+  cursor: no-drop;
+}
+
 /*-----------------------------------------------------------------------------
 | Import children style files
 |----------------------------------------------------------------------------*/

diff --git a/packages/core/src/browser/style/tabs.css b/packages/core/src/browser/style/tabs.css
@@ -10,6 +10,7 @@
   --theia-tabbar-toolbar-z-index: 1001;
   --theia-toolbar-active-transform-scale: 1.272019649;
   --theia-horizontal-toolbar-height: calc(var(--theia-private-horizontal-tab-height) + var(--theia-private-horizontal-tab-scrollbar-rail-height) / 2);
+  --theia-dragover-tab-border-width: 2px;
 }
 
 /*-----------------------------------------------------------------------------
@@ -39,6 +40,19 @@
   align-items: center;
 }
 
+.p-TabBar[data-orientation='vertical'] .p-TabBar-tab {
+  border-top: var(--theia-dragover-tab-border-width) solid transparent !important;
+  border-bottom: var(--theia-dragover-tab-border-width) solid transparent !important;
+}
+
+.p-TabBar[data-orientation='vertical'] .p-TabBar-tab.drop-target-top {
+  border-top-color: var(--theia-activityBar-activeBorder) !important;
+}
+
+.p-TabBar[data-orientation='vertical'] .p-TabBar-tab.drop-target-bottom {
+  border-bottom-color: var(--theia-activityBar-activeBorder) !important;
+}
+
 .p-TabBar[data-orientation='horizontal'] .p-TabBar-tab .theia-tab-icon-label,
 .p-TabBar-tab.p-mod-drag-image .theia-tab-icon-label  {
     display: flex;

diff --git a/packages/core/src/browser/style/view-container.css b/packages/core/src/browser/style/view-container.css
@@ -50,7 +50,7 @@
     height: 100%;
 }
 
-.theia-view-container .part > .header {
+.theia-view-container-part-header {
     cursor: pointer;
     display: flex;
     align-items: center;
@@ -61,26 +61,26 @@
     font-weight: 700;
 }
 
-.theia-view-container .part > .header .theia-ExpansionToggle {
+.theia-view-container-part-header .theia-ExpansionToggle {
     padding-left: 4px;
 }
 
-.theia-view-container > .p-SplitPanel[data-orientation='horizontal'] .part > .header .theia-ExpansionToggle::before {
+.theia-view-container > .p-SplitPanel[data-orientation='horizontal'] .part > .theia-header .theia-ExpansionToggle::before {
     display: none;
     padding-left: 0px;
 }
 
-.theia-view-container > .p-SplitPanel[data-orientation='horizontal'] .part > .header .theia-ExpansionToggle {
+.theia-view-container > .p-SplitPanel[data-orientation='horizontal'] .part > .theia-header .theia-ExpansionToggle {
     padding-left: 0px;
 }
 
-.theia-view-container .part > .header .label {
+.theia-view-container-part-header .label {
     flex: 0;
     white-space: nowrap;
     text-overflow: ellipsis;
 }
 
-.theia-view-container .part > .header .description {
+.theia-view-container-part-header .description {
     flex: 1;
     overflow: hidden;
     white-space: nowrap;
@@ -107,7 +107,7 @@
 }
 
 .theia-view-container .part.drop-target {
-    background: var(--theia-sideBar-dropBackground);
+    background: var(--theia-list-dropBackground);
     border: var(--theia-border-width) dashed var(--theia-contrastActiveBorder);
     transition-property: top, left, right, bottom;
     transition-duration: 150ms;
@@ -143,7 +143,7 @@
 }
 
 .theia-view-container-part-title.menu-open,
-.p-Widget.part:not(.collapsed):hover .header .theia-view-container-part-title,
-.p-Widget.part:not(.collapsed):focus-within .header .theia-view-container-part-title {
+.p-Widget.part:not(.collapsed):hover .theia-view-container-part-header .theia-view-container-part-title,
+.p-Widget.part:not(.collapsed):focus-within .theia-view-container-part-header .theia-view-container-part-title {
     display: flex;
 }