Add repeat, fit-content support

DEVSIX-8383

Author: Dmitry Radchuk

layout/src/main/java/com/itextpdf/layout/exceptions/LayoutExceptionMessageConstant.java

@@ -57,6 +57,10 @@ public final class LayoutExceptionMessageConstant {
             "Invalid grid-column/grid-row properties, cells overlapping";
     public static final String INVALID_FONT_PROPERTY_VALUE = "Invalid FONT property value type.";
     public static final String TAGGING_HINTKEY_SHOULD_HAVE_ACCES = "TaggingHintKey should have accessibility properties" ;
+    public static final String GRID_AUTO_REPEAT_CAN_BE_USED_ONLY_ONCE
+            = "Automatic repetitions in the grid template are allowed only once per template.";
+    public static final String GRID_AUTO_REPEAT_CANNOT_BE_COMBINED_WITH_INDEFINITE_SIZES
+            = "Automatic repetitions in the grid template  cannot be combined with intrinsic or flexible sizes.";
 
     private LayoutExceptionMessageConstant(){}
 }

layout/src/main/java/com/itextpdf/layout/properties/GridValue.java

@@ -0,0 +1,42 @@
+package com.itextpdf.layout.properties.grid;
+
+import java.util.List;
+
+/**
+ * This class represents an auto-repeat template value.
+ * This value is preprocessed before grid sizing algorithm so its only exists at template level.
+ */
+public class AutoRepeatValue extends TemplateValue {
+    private final List<GridValue> values;
+    private final boolean autoFit;
+
+    /**
+     * Create a new auto-repeat value
+     *
+     * @param autoFit determines whether to shrink flatten template values to match the grid size
+     * @param values template values to repeat
+     */
+    public AutoRepeatValue(boolean autoFit, List<GridValue> values) {
+        super(ValueType.AUTO_REPEAT);
+        this.values = values;
+        this.autoFit = autoFit;
+    }
+
+    /**
+     * Get template values which should be repeated.
+     *
+     * @return template values list
+     */
+    public List<GridValue> getValues() {
+        return values;
+    }
+
+    /**
+     * Determines whether to shrink flatten template values to match the grid size.
+     *
+     * @return {@code true} if to shrink, {@code false} otherwise
+     */
+    public boolean isAutoFit() {
+        return autoFit;
+    }
+}

layout/src/main/java/com/itextpdf/layout/properties/grid/AutoRepeatValue.java

@@ -0,0 +1,15 @@
+package com.itextpdf.layout.properties.grid;
+
+/**
+ * Represents an auto template value.
+ */
+public final class AutoValue extends BreadthValue {
+    /**
+     * auto value constant.
+     */
+    public static final AutoValue VALUE = new AutoValue();
+
+    private AutoValue() {
+        super(ValueType.AUTO);
+    }
+}

layout/src/main/java/com/itextpdf/layout/properties/grid/AutoValue.java

@@ -0,0 +1,15 @@
+package com.itextpdf.layout.properties.grid;
+
+/**
+ * Represents a breadth value on a grid.
+ */
+public abstract class BreadthValue extends GridValue {
+    /**
+     * Init a breadth value with a given type
+     *
+     * @param type value type
+     */
+    protected BreadthValue(ValueType type) {
+        super(type);
+    }
+}

layout/src/main/java/com/itextpdf/layout/properties/grid/BreadthValue.java

@@ -0,0 +1,60 @@
+package com.itextpdf.layout.properties.grid;
+
+import com.itextpdf.layout.properties.UnitValue;
+
+/**
+ * Represents fit content function template value.
+ */
+public class FitContentValue extends FunctionValue {
+    private LengthValue length;
+
+    /**
+     * Create fit content function value based on provided {@link LengthValue} instance.
+     *
+     * @param length max size value
+     */
+    public FitContentValue(LengthValue length) {
+        super(ValueType.FIT_CONTENT);
+        this.length = length;
+    }
+
+    /**
+     * Create fit content function value based on provided {@link UnitValue} instance.
+     *
+     * @param length max size value
+     */
+    public FitContentValue(UnitValue length) {
+        super(ValueType.FIT_CONTENT);
+        if (length != null) {
+            if (length.isPointValue()) {
+                this.length = new PointValue(length.getValue());
+            } else if (length.isPercentValue()) {
+                this.length = new PercentValue(length.getValue());
+            }
+        }
+    }
+
+    /**
+     * Get underlying {@link LengthValue} which represents max size on a grid for this value.
+     *
+     * @return underlying {@link LengthValue} value
+     */
+    public LengthValue getLength() {
+        return length;
+    }
+
+    /**
+     * Gets the maximum size which the value can take on passed space.
+     *
+     * @param space the space for which fit-content size will be calculated
+     *
+     * @return the maximum size of the value on passed space
+     */
+    public float getMaxSizeForSpace(float space) {
+        if (length.getType() == GridValue.ValueType.POINT) {
+            return length.getValue();
+        } else {
+            return length.getValue() / 100 * space;
+        }
+    }
+}