feat(@vben-core/popup-ui): add extra header slot to modal (#8310)

Allow custom content to be rendered in the modal header, positioned to the
left of the fullscreen toggle button, via a new `extra` slot. Mirrors the
existing `extra` slot in the drawer component.

Co-authored-by: EvoX <evox@evomap.ai>

.changeset/gold-donkeys-modal-extra.md

@@ -0,0 +1,5 @@
+---
+'@vben-core/popup-ui': minor
+---
+
+feat(@vben-core/popup-ui): support custom content in modal header via extra slot

packages/@core/ui-kit/popup-ui/src/modal/__tests__/modal.test.ts

@@ -106,6 +106,43 @@ describe('vben modal', () => {
     document.dispatchEvent(new MouseEvent('mouseup'));
   });
 
+  it('renders custom content in the extra header slot', async () => {
+    const mainContent = document.createElement('main');
+    mainContent.id = ELEMENT_ID_MAIN_CONTENT;
+    mainContent.innerHTML = '<div><div></div></div>';
+    document.body.append(mainContent);
+
+    const Consumer = defineComponent(() => {
+      const [Modal, modalApi] = useVbenModal({
+        appendToMain: true,
+        fullscreenButton: true,
+        title: 'Slot modal',
+      });
+      onMounted(() => {
+        modalApi.open();
+      });
+      return () =>
+        h(Modal, null, {
+          extra: () => h('span', { class: 'extra-slot-marker' }, 'Custom'),
+        });
+    });
+    const host = document.createElement('div');
+    document.body.append(host);
+    activeApp = createApp(() => h(Consumer));
+    activeApp.mount(host);
+    await nextTick();
+    await nextTick();
+
+    const marker = document.querySelector('.extra-slot-marker');
+    expect(marker).toBeInstanceOf(HTMLElement);
+    if (!(marker instanceof HTMLElement)) return;
+    expect(marker.textContent?.trim()).toBe('Custom');
+    // extra slot 应渲染在 fullscreen 按钮容器内，与全屏按钮同排
+    const container = marker.closest('.absolute');
+    expect(container).toBeInstanceOf(HTMLElement);
+    expect(mainContent.contains(container)).toBe(true);
+  });
+
   it('fires onClosed via the fallback when no animation event arrives', async () => {
     vi.useFakeTimers({
       toFake: [

packages/@core/ui-kit/popup-ui/src/modal/modal.vue

@@ -319,14 +319,20 @@ function handleClosed() {
         <slot></slot>
       </div>
       <VbenLoading v-if="showLoading || submitting" spinning />
-      <VbenIconButton
-        v-if="fullscreenButton"
-        class="absolute top-3 right-10 flex-center size-6 rounded-full px-1 text-lg text-foreground/80 opacity-70 transition-opacity hover:bg-accent hover:text-accent-foreground hover:opacity-100 focus:outline-hidden disabled:pointer-events-none"
-        @click="handleFullscreen"
+      <div
+        v-if="fullscreenButton || $slots.extra"
+        class="absolute top-3 right-10 flex items-center gap-1"
       >
-        <Shrink v-if="fullscreen" class="size-3.5" />
-        <Expand v-else class="size-3.5" />
-      </VbenIconButton>
+        <slot name="extra"></slot>
+        <VbenIconButton
+          v-if="fullscreenButton"
+          class="flex-center size-6 rounded-full px-1 text-lg text-foreground/80 opacity-70 transition-opacity hover:bg-accent hover:text-accent-foreground hover:opacity-100 focus:outline-hidden disabled:pointer-events-none"
+          @click="handleFullscreen"
+        >
+          <Shrink v-if="fullscreen" class="size-3.5" />
+          <Expand v-else class="size-3.5" />
+        </VbenIconButton>
+      </div>
 
       <DialogFooter
         ref="footerRef"