xref: /aoo41x/main/offapi/com/sun/star/form/component/DatabaseImageControl.idl (revision d1766043)

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#ifndef __com_sun_star_form_component_DatabaseImageControl_idl__
#define __com_sun_star_form_component_DatabaseImageControl_idl__

#ifndef __com_sun_star_awt_UnoControlImageControlModel_idl__
#include <com/sun/star/awt/UnoControlImageControlModel.idl>
#endif

#ifndef __com_sun_star_form_DataAwareControlModel_idl__
#include <com/sun/star/form/DataAwareControlModel.idl>
#endif

#ifndef __com_sun_star_form_XImageProducerSupplier_idl__
#include <com/sun/star/form/XImageProducerSupplier.idl>
#endif


//=============================================================================

 module com {  module sun {  module star {  module form {  module component {

//=============================================================================

/** specifies the model of a control used for displaying images stored in a database.

	<p>As every <type scope="com::sun::star::form">DataAwareControlModel</type>, an image control
	can be bound to a database field. This means that for instance with every record change, the content
	of the database field is taken, interpreted as image, and displayed in the control.<br/>
	Unlike other more text-based controls, it does not interpret the content of the field as text or double,
	but as binary stream (see <member scope="com::sun::star::sdb">XColumn::getBinaryStream</member>).</p>

	<p>Usually, an image control model can be bound to binary columns only,	namely
	<member scope="com::sun::star::sdbc">DataType::BINARY</member>,
	<member scope="com::sun::star::sdbc">DataType::VARBINARY</member>,
	<member scope="com::sun::star::sdbc">DataType::LONGVARBINARY</member>,
	<member scope="com::sun::star::sdbc">DataType::OTHER</member>,
	<member scope="com::sun::star::sdbc">DataType::LONGVARCHAR</member></p>

	<p/>

	<p>Note that besides taking the image to be displayed from the bound field, there is another option. The
	<member scope="com::sun::star::awt">UnoControlImageControlModel::ImageURL</member> property specifies
	the URL of an image to be displayed. If this property is changed from outside, the respective file
	is loaded and set as image source.</p>

	<p>In a usual data form, the scenario will be as follows:
		<ul><li>There is a DatabaseImageControl as part of the document model, which acts as
				control model for an <type scope="com::sun::star::form::control">ImageControl</type>.</li>

			<li>The control is an <type scope="com::sun::star::awt">XImageConsumer</type> for the
				<type scope="com::sun::star::awt">XImageProducer</type> supplied by the model.</li>

			<li>Whenever the form's cursor is positioned on a new record, the column the control
				model is bound to is examined for a binary data stream. This stream is set as source
				at the image producer, which notifies it's consumers, which leads to the control
				displaying the image.</li>

			<li>When the user by some interaction tells the control to contain a new image, this is
				exchanged by URL. For example, implementations of the control service may allow the user
				to browse for image. After this, the URL of the image is set as
				<member scope="com::sun::star::awt">UnoControlImageControlModel::ImageURL</member>
				property at the model.<br/>
				Now the control loads the image determined by the property value, and starts producing
				a new data stream, which is displayed by the control (which is a consumer for this stream).<br/>
				From now on, the control and thus the database record counts as modified. If the cursor of the
				form is moved further, the modified record is saved, means the content of the image pointed to
				by <member scope="com::sun::star::awt">UnoControlImageControlModel::ImageURL</member>
				is saved into the column.</li>
		</ul>
	</p>
 */
published service DatabaseImageControl
{
	service com::sun::star::awt::UnoControlImageControlModel;

	service com::sun::star::form::DataAwareControlModel;

	/** supplies the caller with an <type scope="com::sun::star::awt">XImageProducer</type>.

		<p>Other components can register as <type scope="com::sun::star::awt">XImageConsumer</type>
		at this producer. Then they will be notified of any change in the image to be displayed.</p>
	 */
	interface com::sun::star::form::XImageProducerSupplier;

	//-------------------------------------------------------------------------

	/** indicates if it is possible to change the image being displayed.
	 */
	[property] boolean ReadOnly;

};

//=============================================================================

}; }; }; }; };

#endif