ghidra-master/Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/compositeeditor/PointerAction.java
/* ###
 * IP: GHIDRA
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package ghidra.app.plugin.core.compositeeditor;

import static docking.KeyBindingPrecedence.*;

import java.awt.event.KeyEvent;

import javax.swing.KeyStroke;

import docking.ActionContext;
import docking.action.KeyBindingData;
import ghidra.program.model.data.DataType;
import ghidra.program.model.data.PointerDataType;
import ghidra.util.exception.UsrException;

/**
 * Action for use in the composite data type editor.
 * This action has help associated with it.
 */
public class PointerAction extends CompositeEditorTableAction {

	public final static String ACTION_NAME = "Create Pointer";
	private final static String GROUP_NAME = COMPONENT_ACTION_GROUP;
	private final static String DESCRIPTION = "Create a pointer(s) on the selection";
	private final static DataType POINTER_DT = new PointerDataType();
	private final static KeyStroke KEY_STROKE = KeyStroke.getKeyStroke(KeyEvent.VK_P, 0);

	public PointerAction(CompositeEditorProvider provider) {
		super(provider, EDIT_ACTION_PREFIX + ACTION_NAME, GROUP_NAME, null, null, null);
		setDescription(DESCRIPTION);
		setKeyBindingData(new KeyBindingData(KEY_STROKE, DefaultLevel));
		adjustEnablement();
	}

	@Override
	public void actionPerformed(ActionContext context) {
		try {
			model.add(POINTER_DT);
		}
		catch (UsrException e1) {
			model.setStatus(e1.getMessage());
		}
		requestTableFocus();
	}

	@Override
	public boolean isEnabledForContext(ActionContext context) {
		// Do nothing since we always want it enabled so the user gets a "doesn't fit" message.
		return model.getRowCount() > 0 && model.hasSelection() && model.isContiguousSelection();
	}

	@Override
	public void adjustEnablement() {
		// Allow the user to get a "doesn't fit" message on contiguous selection.
		// Also allow message indicating you must have a selection.
		boolean hasSelection = model.hasSelection();
		boolean enable = model.getRowCount() > 0 &&
			(!hasSelection || (hasSelection && model.isContiguousSelection()));
		setEnabled(enable);
	}
}
