vcs: Add splitter between changes tree and commit panel in "Local Changes" (IDEA-212227)

GitOrigin-RevId: bc9b3a020b11648f5a7e43767c2da636633c4e98

platform/vcs-impl/src/com/intellij/openapi/vcs/changes/ChangesViewCommitPanelSplitter.kt

@@ -0,0 +1,34 @@
+// Copyright 2000-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+package com.intellij.openapi.vcs.changes
+
+import com.intellij.ide.util.PropertiesComponent
+import com.intellij.ui.OnePixelSplitter
+import com.intellij.util.ui.update.UiNotifyConnector
+import javax.swing.JComponent
+
+private const val CHANGES_VIEW_COMMIT_SPLITTER_PROPORTION = "ChangesViewManager.COMMIT_SPLITTER_PROPORTION"
+
+private class ChangesViewCommitPanelSplitter : OnePixelSplitter(true, CHANGES_VIEW_COMMIT_SPLITTER_PROPORTION, 1.0f) {
+  private var isDefaultProportionSet = false
+
+  override fun setSecondComponent(component: JComponent?) {
+    if (component != null && !isDefaultProportionSet) {
+      UiNotifyConnector.doWhenFirstShown(this) {
+        isDefaultProportionSet = true
+        proportion = 1.0f - (component.preferredSize.getHeight().toFloat() / height).coerceIn(0.05f, 0.95f)
+      }
+    }
+    super.setSecondComponent(component)
+  }
+
+  override fun loadProportion() {
+    val key = splitterProportionKey
+    isDefaultProportionSet = key != null && PropertiesComponent.getInstance().isValueSet(key)
+
+    if (isDefaultProportionSet) super.loadProportion()
+  }
+
+  override fun saveProportion() {
+    if (isDefaultProportionSet) super.saveProportion()
+  }
+}

platform/vcs-impl/src/com/intellij/openapi/vcs/changes/ChangesViewManager.java

@@ -92,6 +92,7 @@ public class ChangesViewManager implements ChangesViewI, ProjectComponent, Persi
   @NotNull private final ChangesListView myView;
   private ChangesViewCommitPanel myCommitPanel;
   private BorderLayoutPanel myContentPanel;
+  private ChangesViewCommitPanelSplitter myCommitPanelSplitter;
   private SimpleToolWindowPanel myToolWindowPanel;
   private ChangesViewCommitWorkflowHandler myCommitWorkflowHandler;
   private final VcsConfiguration myVcsConfiguration;
@@ -202,14 +203,12 @@ public class ChangesViewManager implements ChangesViewI, ProjectComponent, Persi
         myCommitWorkflowHandler = new ChangesViewCommitWorkflowHandler(new ChangesViewCommitWorkflow(myProject), myCommitPanel);
         Disposer.register(myContent, myCommitPanel);
 
-        myContentPanel.addToBottom(myCommitPanel);
-        myContentPanel.validate();
+        myCommitPanelSplitter.setSecondComponent(myCommitPanel);
         myCommitPanel.setupShortcuts(myToolWindowPanel);
       }
     }
     else if (myCommitPanel != null) {
-      myContentPanel.remove(myCommitPanel);
-      myContentPanel.validate();
+      myCommitPanelSplitter.setSecondComponent(null);
       Disposer.dispose(myCommitPanel);
 
       myCommitPanel = null;
@@ -223,13 +222,15 @@ public class ChangesViewManager implements ChangesViewI, ProjectComponent, Persi
     addBorder(changesToolbar.getComponent(), createBorder(JBColor.border(), SideBorder.RIGHT));
     BorderLayoutPanel changesPanel = simplePanel(createScrollPane(myView)).addToLeft(changesToolbar.getComponent());
 
+    myCommitPanelSplitter = new ChangesViewCommitPanelSplitter();
+    myCommitPanelSplitter.setFirstComponent(changesPanel);
     myContentPanel = new BorderLayoutPanel() {
       @Override
       public Dimension getMinimumSize() {
         return isMinimumSizeSet() ? super.getMinimumSize() : changesToolbar.getComponent().getPreferredSize();
       }
     };
-    myContentPanel.addToCenter(changesPanel);
+    myContentPanel.addToCenter(myCommitPanelSplitter);
 
     MyChangeProcessor changeProcessor = new MyChangeProcessor(myProject);
     mySplitterComponent = new PreviewDiffSplitterComponent(myContentPanel, changeProcessor, CHANGES_VIEW_PREVIEW_SPLITTER_PROPORTION,

platform/vcs-impl/src/com/intellij/vcs/commit/ChangesViewCommitPanel.kt

@@ -126,7 +126,7 @@ class ChangesViewCommitPanel(private val changesView: ChangesListView) : BorderL
     }.withBackground(BACKGROUND_COLOR)
     val centerPanel = simplePanel(commitMessage).addToBottom(buttonPanel)
 
-    addToCenter(centerPanel).addToLeft(toolbar.component).withBorder(createBorder(JBColor.border(), SideBorder.TOP))
+    addToCenter(centerPanel).addToLeft(toolbar.component)
     withPreferredHeight(85)
   }