1 files changed, 175 insertions, 0 deletions
diff --git a/plugins/org.eclipse.bpmn2.modeler.core/src/org/eclipse/bpmn2/modeler/core/preferences/TristateCheckboxFieldEditor.java b/plugins/org.eclipse.bpmn2.modeler.core/src/org/eclipse/bpmn2/modeler/core/preferences/TristateCheckboxFieldEditor.java
new file mode 100644
index 00000000..1f1d481d
--- /dev/null
+++ b/plugins/org.eclipse.bpmn2.modeler.core/src/org/eclipse/bpmn2/modeler/core/preferences/TristateCheckboxFieldEditor.java
@@ -0,0 +1,175 @@
+/*******************************************************************************
+ * Copyright (c) 2011, 2012 Red Hat, Inc. 
+ * All rights reserved. 
+ * This program is made available under the terms of the 
+ * Eclipse Public License v1.0 which accompanies this distribution, 
+ * and is available at http://www.eclipse.org/legal/epl-v10.html 
+ *
+ * Contributors: 
+ * Red Hat, Inc. - initial API and implementation 
+ *******************************************************************************/
+package org.eclipse.bpmn2.modeler.core.preferences;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.eclipse.jface.preference.BooleanFieldEditor;
+import org.eclipse.swt.events.SelectionAdapter;
+import org.eclipse.swt.events.SelectionEvent;
+import org.eclipse.swt.events.SelectionListener;
+import org.eclipse.swt.widgets.Button;
+import org.eclipse.swt.widgets.Composite;
+
+public class TristateCheckboxFieldEditor extends BooleanFieldEditor {
+
+	private List<TristateCheckboxFieldEditor> fields = null;
+	private Composite parent;
+	private int value = 0;
+	private int oldValue = 0;
+	private SelectionListener selectionListener = null;
+	
+	public TristateCheckboxFieldEditor(String name, String label, Composite parent) {
+		super(name, label, parent);
+		this.parent = parent;
+	}
+	
+	public Button getCheckbox() {
+		return getChangeControl(parent);
+	}
+	
+	protected List<TristateCheckboxFieldEditor> getFields() {
+		if (fields==null)
+			fields = new ArrayList<TristateCheckboxFieldEditor>();
+		return fields;
+	}
+	
+	public void addField(final TristateCheckboxFieldEditor field) {
+		getFields().add(field);
+		if (selectionListener==null) {
+			selectionListener = new SelectionAdapter() {
+				@Override
+				public void widgetSelected(SelectionEvent e) {
+					int newValue = getCheckbox().getSelection() ? 1 : 0;
+					if (getCheckbox().getGrayed()) {
+						newValue = 2;
+					}
+					valueChanged(oldValue, newValue);
+					oldValue = newValue;
+					for (TristateCheckboxFieldEditor field : fields) {
+						field.setValue(newValue);
+					}
+					updateCheckState();
+				}
+			};
+			getCheckbox().addSelectionListener(selectionListener);
+		}
+		
+		field.getCheckbox().addSelectionListener(new SelectionAdapter() {
+			@Override
+			public void widgetSelected(SelectionEvent e) {
+				int newValue = getCheckbox().getSelection() ? 2 : 0;
+				valueChanged(field.oldValue, newValue);
+				field.oldValue = newValue;
+				if (field.fields!=null) {
+					for (TristateCheckboxFieldEditor f : field.fields) {
+						f.setValue(newValue);
+					}
+				}
+				updateCheckState();
+			}
+		});
+	}
+	
+	protected void doLoad() {
+		if (getCheckbox() != null) {
+			if (fields==null) {
+				super.doLoad();
+			}
+			else {
+				int value = getPreferenceStore().getInt(getPreferenceName());
+				setValue(value);
+				oldValue = value;
+			}
+		}
+	}
+	protected void doLoadDefault() {
+		if (getCheckbox() != null) {
+			if (fields==null) {
+				super.doLoad();
+			}
+			else {
+				int value = getPreferenceStore().getDefaultInt(getPreferenceName());
+				setValue(value);
+				oldValue = value;
+			}
+		}
+	}
+	protected void doStore() {
+		if (fields==null) {
+			super.doStore();
+		}
+		else {
+			getPreferenceStore().setValue(getPreferenceName(), getValue());
+		}
+	}
+
+	protected void setValue(int newValue) {
+		if (fields==null) {
+			getCheckbox().setSelection(newValue==0 ? false : true);
+		}
+		else {
+			int oldValue = value;
+			if (newValue==0) {
+				getCheckbox().setSelection(false);
+				getCheckbox().setGrayed(false);
+				value = 0;
+			}
+			else if (newValue==1) {
+				getCheckbox().setSelection(true);
+				getCheckbox().setGrayed(true);
+				value = 1;
+			}
+			else if (newValue==2) {
+				getCheckbox().setSelection(true);
+				getCheckbox().setGrayed(false);
+				value = 2;
+			}
+			valueChanged(oldValue,newValue);
+		}
+	}
+	
+	protected void valueChanged(int oldValue, int newValue) {
+		if (fields==null) {
+			super.valueChanged(oldValue==0 ? false : true, newValue==0 ? false : true);
+		}
+		else {
+			setPresentsDefaultValue(false);
+			if (oldValue != newValue) {
+				fireValueChanged(VALUE, oldValue, newValue);
+				value = newValue;
+			}
+		}
+	}
+	
+	public void updateCheckState() {
+		int trueCount = 0;
+		for (TristateCheckboxFieldEditor field : fields) {
+			if (field.getBooleanValue())
+				++trueCount;
+		}
+		
+		if (trueCount == fields.size()) {
+			setValue(2);
+		}
+		else if (trueCount == 0) {
+			setValue(0);
+		}
+		else {
+			setValue(1);
+		}
+	}
+	
+	public int getValue() {
+		return value;
+	}
+}
+\ No newline at end of file