internal: allow studio panel to be draggable

packages/app/src/runner/ResizablePanels.cy.tsx

@@ -5,9 +5,11 @@ import { runnerConstants } from './runner-constants'
 // default values
 const defaultPanel1Width = runnerConstants.defaultSpecListWidth
 const defaultPanel2Width = runnerConstants.defaultReporterWidth
+const defaultPanel4Width = runnerConstants.defaultStudioWidth
 const minPanel1Width = 100
 const minPanel2Width = 100
 const minPanel3Width = 500
+const minPanel4Width = runnerConstants.absoluteStudioMinimum
 
 // helpers
 const assertWidth = (panel: ResizablePanelName, width: number) => {
@@ -38,9 +40,11 @@ describe('<ResizablePanels />', { viewportWidth: 1500, defaultCommandTimeout: 40
             v-slots={slotContents}
             initialPanel1Width={defaultPanel1Width}
             initialPanel2Width={defaultPanel2Width}
+            initialPanel4Width={defaultPanel4Width}
             minPanel1Width={minPanel1Width}
             minPanel2Width={minPanel2Width}
             minPanel3Width={minPanel3Width}
+            minPanel4Width={minPanel4Width}
           />
         </div>))
     })
@@ -106,6 +110,128 @@ describe('<ResizablePanels />', { viewportWidth: 1500, defaultCommandTimeout: 40
     })
   })
 
+  describe('when panel 4 is shown', () => {
+    beforeEach(() => {
+      cy.mount(() => (
+        <div class="flex">
+          <div class="h-screen">
+            <ResizablePanels
+              maxTotalWidth={2000}
+              v-slots={slotContents}
+              initialPanel1Width={defaultPanel1Width}
+              initialPanel2Width={defaultPanel2Width}
+              initialPanel4Width={defaultPanel4Width}
+              minPanel1Width={minPanel1Width}
+              minPanel2Width={minPanel2Width}
+              minPanel3Width={minPanel3Width}
+              minPanel4Width={minPanel4Width}
+              showPanel4={true}
+            />
+          </div></div>))
+    })
+
+    it('the panels can be resized', () => {
+      assertWidth('panel1', defaultPanel1Width)
+      dragHandleToClientX('panel1', 500)
+      assertWidth('panel1', 500)
+      dragHandleToClientX('panel1', 400)
+      assertWidth('panel1', 400)
+
+      assertWidth('panel2', defaultPanel2Width)
+      dragHandleToClientX('panel2', 800)
+      assertWidth('panel2', 400)
+      dragHandleToClientX('panel2', 700)
+      assertWidth('panel2', 300)
+
+      assertWidth('panel4', defaultPanel4Width)
+      dragHandleToClientX('panel4', 1300)
+      assertWidth('panel4', 700)
+      dragHandleToClientX('panel4', 1500)
+      assertWidth('panel4', 500)
+    })
+
+    it('panel 1 can be resized between its minimum allowed width and maximum available space', () => {
+      // drag panel 1 to its minimum width and attempt to go below it
+      assertWidth('panel1', defaultPanel1Width)
+      dragHandleToClientX('panel1', 100)
+      dragHandleToClientX('panel1', 99)
+      assertWidth('panel1', minPanel1Width)
+      dragHandleToClientX('panel1', 50)
+      assertWidth('panel1', minPanel1Width)
+
+      // drag panel 1 to the maximum space available and attempt to go above it
+      dragHandleToClientX('panel1', 710)
+      dragHandleToClientX('panel1', 800)
+      assertWidth('panel1', 710)
+      dragHandleToClientX('panel1', 900)
+      assertWidth('panel1', 710)
+
+      // panel 2 was not reduced
+      assertWidth('panel2', defaultPanel2Width)
+
+      // panel 3 reached its minimum allowed size
+      assertWidth('panel3', 500)
+
+      // panel 4 was not reduced
+      assertWidth('panel4', defaultPanel4Width)
+    })
+
+    it('panel 2 can be resized between its minimum allowed width and maximum available space', () => {
+      // drag panel 2 to its minimum width and attempt to go below it
+      assertWidth('panel2', defaultPanel2Width)
+      dragHandleToClientX('panel2', 380)
+      dragHandleToClientX('panel2', 200)
+      assertWidth('panel2', minPanel2Width)
+      dragHandleToClientX('panel2', 180)
+      assertWidth('panel2', minPanel2Width)
+
+      // drag panel 2 to the maximum space available and attempt to go above it
+      dragHandleToClientX('panel2', 1160)
+      dragHandleToClientX('panel2', 1200)
+      assertWidth('panel2', 880)
+      dragHandleToClientX('panel2', 1300)
+      assertWidth('panel2', 880)
+
+      // panel 1 was not reduced
+      assertWidth('panel1', defaultPanel1Width)
+
+      // panel 3 reached its minimum allowed size
+      assertWidth('panel3', minPanel3Width)
+
+      // panel 4 was not reduced
+      assertWidth('panel4', defaultPanel4Width)
+    })
+
+    it('panel 4 can be resized between its minimum allowed width and maximum available space', () => {
+      // since its starting width is the same as its minimum width,
+      // drag panel 4 to a different width, then drag it to its minimum width and attempt to go below it
+      assertWidth('panel4', defaultPanel4Width)
+      dragHandleToClientX('panel4', 1400)
+      assertWidth('panel4', 600)
+      dragHandleToClientX('panel4', 1660)
+      dragHandleToClientX('panel4', 1800)
+      assertWidth('panel4', minPanel4Width)
+      dragHandleToClientX('panel4', 1900)
+      assertWidth('panel4', minPanel4Width)
+
+      // drag panel 4 to the maximum space available and attempt to go above it
+      dragHandleToClientX('panel4', 1230)
+      dragHandleToClientX('panel4', 1100)
+      assertWidth('panel4', 770)
+      dragHandleToClientX('panel4', 900)
+      assertWidth('panel4', 770)
+
+      // panel 1 was not reduced
+      assertWidth('panel1', defaultPanel1Width)
+
+      // panel 2 was not reduced
+      assertWidth('panel2', defaultPanel2Width)
+
+      // panel 3 reached its absolute minimum allowed size
+      assertWidth('panel3', minPanel3Width)
+    })
+  })
+
   describe('when there is a side nav', () => {
     it('handles being offset by some distance on the left', () => {
       cy.mount(() => (

packages/app/src/runner/ResizablePanels.vue

@@ -4,7 +4,7 @@
     id="resizable-panels-root"
     class="flex"
     :class="{
-      'select-none': panel1IsDragging || panel2IsDragging,
+      'select-none': panel1IsDragging || panel2IsDragging || panel4IsDragging,
     }"
     @mouseup="handleMouseup"
     @mousemove="handleMousemove"
@@ -14,7 +14,7 @@
       v-show="showPanel1"
       data-cy="specs-list-panel"
       class="h-full shrink-0 z-20 relative"
-      :style="{width: `${panel1Width}px`}"
+      :style="{ width: `${panel1Width}px` }"
     >
       <slot
         name="panel1"
@@ -32,7 +32,7 @@
       v-show="showPanel2"
       data-cy="reporter-panel"
       class="h-full shrink-0 z-10 relative"
-      :style="{width: `${panel2Width}px`}"
+      :style="{ width: `${panel2Width}px` }"
     >
       <slot name="panel2" />
 
@@ -46,7 +46,7 @@
     <div
       data-cy="aut-panel"
       class="grow h-full bg-gray-100 relative"
-      :class="{'pointer-events-none':panel2IsDragging}"
+      :class="{ 'pointer-events-none': panel2IsDragging || panel4IsDragging }"
       :style="{ width: `${panel3width}px` }"
     >
       <slot
@@ -58,12 +58,15 @@
     <div
       v-show="showPanel4"
       data-cy="panel-4"
-      class="h-full bg-gray-100 relative"
-      :style="{width: `${panel4Width}px`}"
+      class="h-full shrink-0 z-10 bg-gray-100 relative"
+      :style="{ width: `${panel4Width}px` }"
     >
-      <slot
-        name="panel4"
-        :width="panel4Width"
+      <slot name="panel4" />
+
+      <div
+        data-cy="panel4ResizeHandle"
+        class="cursor-ew-resize h-full top-0 left-[-6px] w-[10px] z-30 absolute"
+        @mousedown="handleMousedown('panel4', $event)"
       />
     </div>
   </div>
@@ -86,9 +89,11 @@ const props = withDefaults(defineProps<{
   showPanel4?: boolean // studio in runner
   initialPanel1Width?: number
   initialPanel2Width?: number
+  initialPanel4Width?: number
   minPanel1Width?: number
   minPanel2Width?: number
   minPanel3Width?: number
+  minPanel4Width?: number
   maxTotalWidth?: number // windowWidth in runner
   offsetLeft?: number
 }>(), {
@@ -97,23 +102,28 @@ const props = withDefaults(defineProps<{
   showPanel4: false,
   initialPanel1Width: runnerConstants.defaultSpecListWidth,
   initialPanel2Width: runnerConstants.defaultReporterWidth,
+  initialPanel4Width: runnerConstants.defaultStudioWidth,
   minPanel1Width: 200,
   minPanel2Width: 220,
   minPanel3Width: 100,
+  minPanel4Width: 340,
   maxTotalWidth: window.innerWidth,
   offsetLeft: 0,
 })
 
 const emit = defineEmits<{
   (e: 'resizeEnd', value: DraggablePanel): void
-  (e: 'panelWidthUpdated', value: {panel: DraggablePanel, width: number}): void
+  (e: 'panelWidthUpdated', value: { panel: DraggablePanel, width: number }): void
 }>()
 
 const panel1HandleX = ref(props.initialPanel1Width)
 const panel2HandleX = ref(props.initialPanel2Width + props.initialPanel1Width)
+const panel4HandleX = ref(props.initialPanel2Width + props.initialPanel1Width + props.initialPanel4Width)
 const panel1IsDragging = ref(false)
 const panel2IsDragging = ref(false)
+const panel4IsDragging = ref(false)
 const cachedPanel1Width = ref<number>(props.initialPanel1Width) // because panel 1 (the inline specs list) can be opened and closed in the UI, we cache the width
+const cachedPanel4Width = ref(props.initialPanel4Width)
 const panel2Width = ref(props.initialPanel2Width)
 
 const handleMousedown = (panel: DraggablePanel, event: MouseEvent) => {
@@ -122,10 +132,13 @@ const handleMousedown = (panel: DraggablePanel, event: MouseEvent) => {
   } else if (panel === 'panel2') {
     panel2IsDragging.value = true
     panel2HandleX.value = event.clientX
+  } else if (panel === 'panel4') {
+    panel4IsDragging.value = true
+    panel4HandleX.value = event.clientX
   }
 }
 const handleMousemove = (event: MouseEvent) => {
-  if (!panel1IsDragging.value && !panel2IsDragging.value) {
+  if (!panel1IsDragging.value && !panel2IsDragging.value && !panel4IsDragging.value) {
     // nothing is dragging, ignore mousemove
 
     return
@@ -139,6 +152,15 @@ const handleMousemove = (event: MouseEvent) => {
     panel2HandleX.value = event.clientX
     panel2Width.value = event.clientX - props.offsetLeft - panel1Width.value
     emit('panelWidthUpdated', { panel: 'panel2', width: panel2Width.value })
+  } else if (panel4IsDragging.value && isNewWidthAllowed(event.clientX, 'panel4')) {
+    panel4HandleX.value = event.clientX
+    // Calculate width from the right edge of the window
+    // so that when we drag the panel to the left, it grows
+    // and when we drag it to the right, it shrinks
+    const rightEdge = props.maxTotalWidth + props.offsetLeft
+
+    cachedPanel4Width.value = rightEdge - event.clientX
+    emit('panelWidthUpdated', { panel: 'panel4', width: panel4Width.value })
   }
 }
 const handleMouseup = () => {
@@ -149,30 +171,37 @@ const handleMouseup = () => {
     return
   }
 
-  handleResizeEnd('panel2')
-  panel2IsDragging.value = false
+  if (panel2IsDragging.value) {
+    handleResizeEnd('panel2')
+    panel2IsDragging.value = false
+  }
+
+  if (panel4IsDragging.value) {
+    handleResizeEnd('panel4')
+    panel4IsDragging.value = false
+  }
 }
 
 const maxPanel1Width = computed(() => {
-  const unavailableWidth = panel2Width.value + props.minPanel3Width
+  const unavailableWidth = panel2Width.value + props.minPanel3Width + panel4Width.value
 
   return props.maxTotalWidth - unavailableWidth
 })
 
-const panel4Width = computed(() => {
-  if (!props.showPanel4) {
+const panel1Width = computed(() => {
+  if (!props.showPanel1) {
     return 0
   }
 
-  return runnerConstants.defaultStudioWidth
+  return cachedPanel1Width.value
 })
 
-const panel1Width = computed(() => {
-  if (!props.showPanel1) {
+const panel4Width = computed(() => {
+  if (!props.showPanel4) {
     return 0
   }
 
-  return cachedPanel1Width.value
+  return cachedPanel4Width.value
 })
 
 const maxPanel2Width = computed(() => {
@@ -192,6 +221,12 @@ const panel3width = computed(() => {
   return panel3SpaceAvailable < props.minPanel3Width ? minimumWithBuffer : panel3SpaceAvailable
 })
 
+const maxPanel4Width = computed(() => {
+  const unavailableWidth = panel1Width.value + panel2Width.value + props.minPanel3Width
+
+  return props.maxTotalWidth - unavailableWidth
+})
+
 function handleResizeEnd (panel: DraggablePanel) {
   emit('resizeEnd', panel)
 }
@@ -212,15 +247,29 @@ function isNewWidthAllowed (mouseClientX: number, panel: DraggablePanel) {
     return result
   }
 
-  const newWidth = mouseClientX - props.offsetLeft - panel1Width.value
+  if (panel === 'panel2') {
+    const newWidth = mouseClientX - props.offsetLeft - panel1Width.value
+
+    if (isMaxWidthSmall && newWidth > fallbackWidth) {
+      return true
+    }
+
+    return panel2IsDragging.value && newWidth >= props.minPanel2Width && newWidth <= maxPanel2Width.value
+  }
+
+  if (panel === 'panel4') {
+    const rightEdge = props.maxTotalWidth + props.offsetLeft
+    const newWidth = rightEdge - mouseClientX
+
+    if (isMaxWidthSmall && newWidth >= props.minPanel4Width) {
+      return true
+    }
 
-  if (isMaxWidthSmall && newWidth > fallbackWidth) {
-    return true
+    return panel4IsDragging.value && newWidth >= props.minPanel4Width && newWidth <= maxPanel4Width.value
   }
 
-  return panel2IsDragging.value && newWidth >= props.minPanel2Width && newWidth <= maxPanel2Width.value
+  return false
 }
-
 watchEffect(() => {
   if (!props.showPanel1) {
     emit('panelWidthUpdated', { panel: 'panel1', width: 0 })
@@ -231,7 +280,7 @@ watchEffect(() => {
   if (!props.showPanel4) {
     emit('panelWidthUpdated', { panel: 'panel4', width: 0 })
   } else if (props.showPanel4) {
-    emit('panelWidthUpdated', { panel: 'panel4', width: panel4Width.value })
+    emit('panelWidthUpdated', { panel: 'panel4', width: cachedPanel4Width.value })
   }
 })