org.eclipse.jface.fieldassist.ComboContentAdapter.java Source code

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Here is the source code for org.eclipse.jface.fieldassist.ComboContentAdapter.java

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/*******************************************************************************
 * Copyright (c) 2005, 2019 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jface.fieldassist;

import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Control;

/**
 * An {@link IControlContentAdapter} for SWT Combo controls. This is a
 * convenience class for easily creating a {@link ContentProposalAdapter} for
 * combo fields.
 *
 * @since 3.2
 */
public class ComboContentAdapter implements IControlContentAdapter, IControlContentAdapter2 {

    @Override
    public String getControlContents(Control control) {
        return ((Combo) control).getText();
    }

    @Override
    public void setControlContents(Control control, String text, int cursorPosition) {
        ((Combo) control).setText(text);
        ((Combo) control).setSelection(new Point(cursorPosition, cursorPosition));
    }

    @Override
    public void insertControlContents(Control control, String text, int cursorPosition) {
        Combo combo = (Combo) control;
        String contents = combo.getText();
        Point selection = combo.getSelection();
        StringBuilder sb = new StringBuilder();
        sb.append(contents.substring(0, selection.x));
        sb.append(text);
        if (selection.y < contents.length()) {
            sb.append(contents.substring(selection.y, contents.length()));
        }
        combo.setText(sb.toString());
        selection.x = selection.x + cursorPosition;
        selection.y = selection.x;
        combo.setSelection(selection);
    }

    @Override
    public int getCursorPosition(Control control) {
        return ((Combo) control).getSelection().x;
    }

    @Override
    public Rectangle getInsertionBounds(Control control) {
        // This doesn't take horizontal scrolling into affect.
        // see https://bugs.eclipse.org/bugs/show_bug.cgi?id=204599
        Combo combo = (Combo) control;
        int position = combo.getSelection().y;
        String contents = combo.getText();
        GC gc = new GC(combo);
        gc.setFont(combo.getFont());
        Point extent = gc.textExtent(contents.substring(0, Math.min(position, contents.length())));
        gc.dispose();
        return new Rectangle(combo.getClientArea().x + extent.x, combo.getClientArea().y, 1,
                combo.getClientArea().height);
    }

    @Override
    public void setCursorPosition(Control control, int index) {
        ((Combo) control).setSelection(new Point(index, index));
    }

    /**
     * @see org.eclipse.jface.fieldassist.IControlContentAdapter2#getSelection(org.eclipse.swt.widgets.Control)
     *
     * @since 3.4
     */
    @Override
    public Point getSelection(Control control) {
        return ((Combo) control).getSelection();
    }

    /**
     * @see org.eclipse.jface.fieldassist.IControlContentAdapter2#setSelection(org.eclipse.swt.widgets.Control,
     *      org.eclipse.swt.graphics.Point)
     *
     * @since 3.4
     */
    @Override
    public void setSelection(Control control, Point range) {
        ((Combo) control).setSelection(range);
    }

}