org.eclipse.jface.text.IInformationControl Maven / Gradle / Ivy
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/*******************************************************************************
* Copyright (c) 2000, 2010 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jface.text;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.events.FocusListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Point;
/**
* Interface of a control presenting information. The information is given in
* the form of an input object. It can be either the content itself or a
* description of the content. The specification of what is required from an
* input object is left to the implementers of this interface.
*
* If this information control is used by a {@link AbstractHoverInformationControlManager}
* then that manager will own this control and override any properties that
* may have been set before by any other client.
*
* The information control must not grab focus when made visible using
* setVisible(true).
*
* In order to provide backward compatibility for clients of
* IInformationControl, extension interfaces are used as a means
* of evolution. The following extension interfaces exist:
*
* - {@link org.eclipse.jface.text.IInformationControlExtension} since
* version 2.0 introducing the predicate of whether the control has anything to
* show or would be empty
* - {@link org.eclipse.jface.text.IInformationControlExtension2} since
* version 2.1 replacing the original concept of textual input by general input
* objects.
* - {@link org.eclipse.jface.text.IInformationControlExtension3} since
* version 3.0 providing access to the control's bounds and introducing
* the concept of persistent size and location.
* - {@link org.eclipse.jface.text.IInformationControlExtension4} since
* version 3.3, adding API which allows to set this information control's status field text.
* - {@link org.eclipse.jface.text.IInformationControlExtension5} since
* version 3.4, adding API to get the visibility of the control, to
* test whether another control is a child of the information control,
* to compute size constraints based on the information control's main font
* and to return a control creator for an enriched version of this information control.
*
*
* Clients can implement this interface and its extension interfaces,
* subclass {@link AbstractInformationControl}, or use the (text-based)
* default implementation {@link DefaultInformationControl}.
*
* @see org.eclipse.jface.text.IInformationControlExtension
* @see org.eclipse.jface.text.IInformationControlExtension2
* @see org.eclipse.jface.text.IInformationControlExtension3
* @see org.eclipse.jface.text.IInformationControlExtension4
* @see org.eclipse.jface.text.IInformationControlExtension5
* @see AbstractInformationControl
* @see DefaultInformationControl
* @since 2.0
*/
public interface IInformationControl {
/**
* Sets the information to be presented by this information control.
*
* Replaced by {@link IInformationControlExtension2#setInput(Object)}.
*
* @param information the information to be presented
*/
void setInformation(String information);
/**
* Sets the information control's size constraints. A constraint value of
* {@link SWT#DEFAULT} indicates no constraint. This method must be called before
* {@link #computeSizeHint()} is called.
*
* Note: An information control which implements {@link IInformationControlExtension3}
* may ignore this method or use it as hint for its very first appearance.
*
* @param maxWidth the maximal width of the control to present the information, or {@link SWT#DEFAULT} for not constraint
* @param maxHeight the maximal height of the control to present the information, or {@link SWT#DEFAULT} for not constraint
*/
void setSizeConstraints(int maxWidth, int maxHeight);
/**
* Computes and returns a proposal for the size of this information control depending
* on the information to present. The method tries to honor known size constraints but might
* return a size that exceeds them.
*
* @return the computed size hint
*/
Point computeSizeHint();
/**
* Controls the visibility of this information control.
*
* Note: The information control must not grab focus when
* made visible.
*
*
* @param visible true if the control should be visible
*/
void setVisible(boolean visible);
/**
* Sets the size of this information control.
*
* @param width the width of the control
* @param height the height of the control
*/
void setSize(int width, int height);
/**
* Sets the location of this information control.
*
* @param location the location
*/
void setLocation(Point location);
/**
* Disposes this information control.
*/
void dispose();
/**
* Adds the given listener to the list of dispose listeners.
* If the listener is already registered it is not registered again.
*
* @param listener the listener to be added
*/
void addDisposeListener(DisposeListener listener);
/**
* Removes the given listeners from the list of dispose listeners.
* If the listener is not registered this call has no effect.
*
* @param listener the listener to be removed
*/
void removeDisposeListener(DisposeListener listener);
/**
* Sets the foreground color of this information control.
*
* @param foreground the foreground color of this information control
*/
void setForegroundColor(Color foreground);
/**
* Sets the background color of this information control.
*
* @param background the background color of this information control
*/
void setBackgroundColor(Color background);
/**
* Returns whether this information control (or one of its children) has the focus.
* The suggested implementation is like this (fShell is this information control's shell):
* return fShell.getDisplay().getActiveShell() == fShell
*
* @return true when the information control has the focus, otherwise false
*/
boolean isFocusControl();
/**
* Sets the keyboard focus to this information control.
*/
void setFocus();
/**
* Adds the given listener to the list of focus listeners.
* If the listener is already registered it is not registered again.
*
* The suggested implementation is to install listeners for {@link SWT#Activate} and {@link SWT#Deactivate}
* on the shell and forward events to the focus listeners. Clients are
* encouraged to subclass {@link AbstractInformationControl}, which does this
* for free.
*
*
* @param listener the listener to be added
*/
void addFocusListener(FocusListener listener);
/**
* Removes the given listeners from the list of focus listeners.
* If the listener is not registered this call has no effect.
*
* @param listener the listener to be removed
*/
void removeFocusListener(FocusListener listener);
}