From a96e0dec0c30d69ddea6e8febac52f82f94ff4dd Mon Sep 17 00:00:00 2001
From: Austin Mroz <austin@comfy.org>
Date: Tue, 23 Dec 2025 17:52:18 -0800
Subject: [PATCH] Initial pan/zoom implementation

---
 src/components/ui/ZoomPane.vue | 44 ++++++++++++++++++++++++++++++++++
 src/views/LinearView.vue       | 18 +++++++++-----
 2 files changed, 56 insertions(+), 6 deletions(-)
 create mode 100644 src/components/ui/ZoomPane.vue

diff --git a/src/components/ui/ZoomPane.vue b/src/components/ui/ZoomPane.vue
new file mode 100644
index 000000000..f2b19c169
--- /dev/null
+++ b/src/components/ui/ZoomPane.vue
@@ -0,0 +1,44 @@
+<script setup lang="ts">
+import { computed, ref, useTemplateRef } from 'vue'
+
+const zoomPane = useTemplateRef('zoomPane')
+
+const zoom = ref(1.0)
+const panX = ref(0.0)
+const panY = ref(0.0)
+
+function handleWheel(e: WheelEvent) {
+  zoom.value -= e.deltaY
+  //TODO apply pan relative to mouse coords?
+}
+let dragging = false
+function handleDown(e: PointerEvent) {
+  const zoomPaneEl = zoomPane.value
+  if (!zoomPaneEl) return
+  zoomPaneEl.setPointerCapture(e.pointerId)
+  dragging = true
+}
+function handleMove(e: PointerEvent) {
+  if (!dragging) return
+  panX.value += e.movementX
+  panY.value += e.movementY
+}
+
+const transform = computed(() => {
+  const scale = 1.1 ** (zoom.value / 30)
+  const matrix = [scale, 0, 0, scale, panX.value, panY.value]
+  return `matrix(${matrix.join(',')})`
+})
+</script>
+<template>
+  <div
+    ref="zoomPane"
+    class="contain-content"
+    @wheel="handleWheel"
+    @pointerdown.prevent="handleDown"
+    @pointermove="handleMove"
+    @pointerup="dragging = false"
+  >
+    <slot :style="{ transform }" />
+  </div>
+</template>
diff --git a/src/views/LinearView.vue b/src/views/LinearView.vue
index f8ba37e39..826757fbf 100644
--- a/src/views/LinearView.vue
+++ b/src/views/LinearView.vue
@@ -14,6 +14,7 @@ import { computed, ref, shallowRef, useTemplateRef, watch } from 'vue'
 
 import TopbarBadges from '@/components/topbar/TopbarBadges.vue'
 import WorkflowTabs from '@/components/topbar/WorkflowTabs.vue'
+import ZoomPane from '@/components/ui/ZoomPane.vue'
 import Button from '@/components/ui/button/Button.vue'
 import { safeWidgetMapper } from '@/composables/graph/useGraphNodeManager'
 import { d, t } from '@/i18n'
@@ -267,6 +268,10 @@ function gotoPreviousOutput() {
 }
 
 function handleCenterWheel(e: WheelEvent) {
+  if (!e.ctrlKey && !e.metaKey) return
+  e.preventDefault()
+  e.stopPropagation()
+
   //TODO roll in litegraph/CanvasPointer and give slight stickiness when on trackpad
   if (e.deltaY > 0) gotoNextOutput()
   else {
@@ -347,7 +352,7 @@ function handleCenterWheel(e: WheelEvent) {
       <SplitterPanel
         :size="98"
         class="flex flex-col min-w-min gap-4 mx-12 my-8 relative"
-        @wheel="handleCenterWheel"
+        @wheel.capture="handleCenterWheel"
       >
         <div class="flex gap-4 text-muted-foreground h-14 w-full items-center">
           <div
@@ -374,18 +379,19 @@ function handleCenterWheel(e: WheelEvent) {
             <i class="icon-[lucide--ellipsis]" />
           </Button>
         </div>
-        <img
+        <ZoomPane
           v-if="preview?.mediaType === 'images'"
-          class="object-contain flex-1 max-h-full"
-          :src="preview.url"
-        />
+          v-slot="slotProps"
+          class="flex-1 w-full"
+        >
+          <img :src="preview.url" v-bind="slotProps" />
+        </ZoomPane>
         <!--FIXME: core videos are type 'images', VHS still wrapped as 'gifs'-->
         <video
           v-else-if="preview?.mediaType === 'gifs'"
           class="object-contain flex-1 min-h-0"
           controls
           :src="preview.url"
-          @wheel.prevent
         />
         <img
           v-else