UI DSL: API for explicitly specifying the indent of subrows of the given row

GitOrigin-RevId: 4ddcd3218d2ce3625b43e1413f49db6ac7f81343

platform/platform-impl/src/com/intellij/ui/layout/Row.kt

@@ -92,6 +92,12 @@ abstract class Row : Cell(), RowBuilder {
 
   abstract var subRowsVisible: Boolean
 
+  /**
+   * Indent for child rows of this row, expressed in steps (multiples of [SpacingConfiguration.indentLevel]). Replaces indent
+   * calculated from row nesting.
+   */
+  abstract var subRowIndent: Int
+
   protected abstract val builder: LayoutBuilderImpl
 
   /**

platform/platform-impl/src/com/intellij/ui/layout/ShowcaseUiDslAction.kt

@@ -16,6 +16,7 @@ internal class ShowcaseUiDslAction : DumbAwareAction() {
     tabs.presentation.setAlphabeticalMode(false)
 
     tabs.addTab(TabInfo(secondColumnSmallerPanel()).setText("Second Column Smaller"))
+    tabs.addTab(TabInfo(rowWithIndent()).setText("Row with Indent"))
 
     val dialog = dialog("UI DSL Showcase", tabs.component)
     Disposer.register(dialog.disposable, disposable)

platform/platform-impl/src/com/intellij/ui/layout/migLayout/MigLayoutRow.kt

@@ -140,6 +140,8 @@ internal class MigLayoutRow(private val parent: MigLayoutRow?,
       }
     }
 
+  override var subRowIndent: Int = -1
+
   internal val isLabeledIncludingSubRows: Boolean
     get() = labeled || (subRows?.any { it.isLabeledIncludingSubRows } ?: false)
 
@@ -160,7 +162,7 @@ internal class MigLayoutRow(private val parent: MigLayoutRow?,
     val row = MigLayoutRow(this, builder,
                            labeled = label != null,
                            noGrid = noGrid,
-                           indent = indent + computeChildRowIndent(isSeparated))
+                           indent = if (subRowIndent >= 0) subRowIndent * spacing.indentLevel else indent + computeChildRowIndent(isSeparated))
 
     if (isSeparated) {
       val separatorRow = MigLayoutRow(this, builder, indent = indent, noGrid = true)

platform/platform-impl/src/com/intellij/ui/layout/testPanels.kt

@@ -308,3 +308,25 @@ fun separatorAndComment() : JPanel {
     }
   }
 }
+
+fun rowWithIndent(): JPanel {
+  return panel {
+    row("Zero") {
+      subRowIndent = 0
+      row("Bar 0") {
+      }
+    }
+    row("One") {
+      subRowIndent = 1
+
+      row("Bar 1") {
+      }
+    }
+    row("Two") {
+      subRowIndent = 2
+
+      row("Bar 2") {
+      }
+    }
+  }
+}

platform/platform-tests/testData/ui/layout/subRowsIndent.yml

@@ -0,0 +1,51 @@
+layoutConstraints:
+  fillX: true
+  gridGapX:
+    min: &id001 {horizontal: true, unit: 0, value: 0.0}
+    preferred: *id001
+  gridGapY:
+    min: &id002 {horizontal: false, value: 10.0}
+    preferred: *id002
+  hideMode: 2
+  insets:
+  - {horizontal: false, unit: 0, value: 0.0}
+  - {horizontal: true, unit: 0, value: 0.0}
+  - {horizontal: false, unit: 0, value: 0.0}
+  - {horizontal: true, unit: 0, value: 0.0}
+rowConstraints:
+  constraints:
+  - align: &id003 {horizontal: false, unit: -1, value: 0.0}
+  - align: *id003
+  - align: *id003
+  - align: *id003
+  - align: *id003
+  - align: *id003
+  count: 6
+columnConstraints:
+  constraints:
+  - gapAfter:
+      max: &id004 {horizontal: true, value: 6.0}
+      min: *id004
+      preferred: *id004
+    grow: 0.0
+  - {}
+  count: 2
+componentConstrains:
+  Zero [label]: {spanX: INF, wrap: true}
+  Bar 0 [label]: {spanX: INF, wrap: true}
+  One [label]: {spanX: INF, wrap: true}
+  Bar 1 [label]:
+    horizontal:
+      gapBefore:
+        min: &id005 {horizontal: true, value: 24.0}
+        preferred: *id005
+    spanX: INF
+    wrap: true
+  Two [label]: {spanX: INF, wrap: true}
+  Bar 2 [label]:
+    horizontal:
+      gapBefore:
+        min: &id006 {horizontal: true, value: 48.0}
+        preferred: *id006
+    spanX: INF
+    wrap: true

platform/platform-tests/testSrc/com/intellij/ui/layout/UiDslTest.kt

@@ -113,5 +113,10 @@ abstract class UiDslTest {
     }
   }
 
+  @Test
+  fun subRowsIndent() {
+    doTest { rowWithIndent() }
+  }
+
   protected abstract fun doTest(panelCreator: () -> JPanel)
 }