8293119: Additional constrained resize policies for Tree/TableView

modules/javafx.controls/src/main/java/com/sun/javafx/scene/control/ConstrainedColumnResize.java

@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2022, 2023, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package com.sun.javafx.scene.control;
+
+import java.util.List;
+import javafx.css.PseudoClass;
+import javafx.scene.Node;
+import javafx.scene.control.ConstrainedColumnResizeBase;
+import javafx.scene.control.ResizeFeaturesBase;
+import javafx.scene.control.TableColumnBase;
+import javafx.scene.control.TableView;
+import javafx.scene.control.TreeTableView;
+import javafx.util.Callback;
+
+/**
+ * A constrained column resize implementation that honors all Tree/TableColumn constraints -
+ * minimum, preferred, and maximum width.
+ */
+public class ConstrainedColumnResize extends ConstrainedColumnResizeBase {
+
+    public enum ResizeMode {
+        AUTO_RESIZE_FLEX_HEAD,
+        AUTO_RESIZE_FLEX_TAIL, // will be used to replace a (deprecated) CONSTRAINED_RESIZE_POLICY.
+        AUTO_RESIZE_NEXT_COLUMN,
+        AUTO_RESIZE_SUBSEQUENT_COLUMNS,
+        AUTO_RESIZE_LAST_COLUMN,
+        AUTO_RESIZE_ALL_COLUMNS
+    }
+
+    private final ResizeMode mode;
+
+    public ConstrainedColumnResize(ResizeMode m) {
+        this.mode = m;
+    }
+
+    public boolean constrainedResize(ResizeFeaturesBase rf,
+        List<? extends TableColumnBase<?,?>> visibleLeafColumns) {
+
+        double contentWidth = rf.getContentWidth();
+        if (contentWidth == 0.0) {
+            return false;
+        }
+
+        ResizeHelper h = new ResizeHelper(rf, contentWidth, visibleLeafColumns, mode);
+        h.resizeToContentWidth();
+
+        boolean rv;
+        TableColumnBase<?,?> column = rf.getColumn();
+        if (column == null) {
+            rv = false;
+        } else {
+            rv = h.resizeColumn(column);
+        }
+
+        // conditionally remove pseudoclass (given by this policy toString()) when the columns
+        // are narrower than the available area and the rightmost column boundary line needs to be drawn.
+        // hint: search modena.css for "constrained-resize" token
+        Node n = rf.getTableControl();
+        PseudoClass pc = PseudoClass.getPseudoClass(toString());
+        boolean wide = h.applySizes();
+        boolean current = n.getPseudoClassStates().contains(pc);
+        if (wide != current) {
+            if (wide) {
+                n.pseudoClassStateChanged(pc, true);
+            } else {
+                n.pseudoClassStateChanged(pc, false);
+            }
+        }
+        return rv;
+    }
+
+    public static TablePolicy forTable(ResizeMode m) {
+        return new TablePolicy(m);
+    }
+
+    public static TreeTablePolicy forTreeTable(ResizeMode m) {
+        return new TreeTablePolicy(m);
+    }
+
+    public static class TablePolicy
+        extends ConstrainedColumnResize
+        implements Callback<TableView.ResizeFeatures,Boolean> {
+
+        public TablePolicy(ResizeMode m) {
+            super(m);
+        }
+
+        @Override
+        public Boolean call(TableView.ResizeFeatures rf) {
+            List<? extends TableColumnBase<?,?>> visibleLeafColumns = rf.getTable().getVisibleLeafColumns();
+            return constrainedResize(rf, visibleLeafColumns);
+        }
+    }
+
+    public static class TreeTablePolicy
+        extends ConstrainedColumnResize
+        implements Callback<TreeTableView.ResizeFeatures,Boolean> {
+
+        public TreeTablePolicy(ResizeMode m) {
+            super(m);
+        }
+
+        @Override
+        public Boolean call(TreeTableView.ResizeFeatures rf) {
+            List<? extends TableColumnBase<?,?>> visibleLeafColumns = rf.getTable().getVisibleLeafColumns();
+            return constrainedResize(rf, visibleLeafColumns);
+        }
+    }
+}