ownerdrawbutton.java

jfm关于如何使用的示例程序

package org.eclipse.swt.widgets;

import org.eclipse.swt.internal.win32.*;

public abstract class OwnerDrawButton extends Button
{
	public OwnerDrawButton( Composite parent, int style )
	{
		super( parent, style );

		int osStyle = OS.GetWindowLong( handle, OS.GWL_STYLE );
		osStyle |= OS.BS_OWNERDRAW;
		OS.SetWindowLong( handle, OS.GWL_STYLE, osStyle );
	}

	LRESULT wmDrawChild( int wParam, int lParam )
	{
		super.wmDrawChild( wParam, lParam );
		DRAWITEMSTRUCT struct = new DRAWITEMSTRUCT();
		OS.MoveMemory( struct, lParam, DRAWITEMSTRUCT.sizeof );
		ownerDraw( struct );
		return null;
	}

	protected abstract void ownerDraw( DRAWITEMSTRUCT dis );
}