org.eclipse.swt.widgets.Button Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2002, 2019 Innoopract Informationssysteme GmbH 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:
* Innoopract Informationssysteme GmbH - initial API and implementation
* EclipseSource - ongoing development
******************************************************************************/
package org.eclipse.swt.widgets;
import static org.eclipse.rap.rwt.internal.textsize.TextSizeUtil.getCharHeight;
import static org.eclipse.rap.rwt.internal.textsize.TextSizeUtil.textExtent;
import static org.eclipse.swt.internal.widgets.MarkupUtil.checkMarkupPrecondition;
import static org.eclipse.swt.internal.widgets.MarkupUtil.isMarkupEnabledFor;
import static org.eclipse.swt.internal.widgets.MarkupUtil.MarkupTarget.TEXT;
import static org.eclipse.swt.internal.widgets.MarkupValidator.isValidationDisabledFor;
import org.eclipse.rap.rwt.RWT;
import org.eclipse.rap.rwt.internal.lifecycle.WidgetLCA;
import org.eclipse.rap.rwt.internal.theme.Size;
import org.eclipse.rap.rwt.internal.theme.ThemeAdapter;
import org.eclipse.rap.rwt.theme.BoxDimensions;
import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.internal.widgets.MarkupValidator;
import org.eclipse.swt.internal.widgets.buttonkit.ButtonLCA;
import org.eclipse.swt.internal.widgets.buttonkit.ButtonThemeAdapter;
/**
* Instances of this class represent a selectable user interface object that
* issues notification when pressed and released.
*
* - Styles:
* - CHECK, PUSH, RADIO, TOGGLE, FLAT, WRAP
* - LEFT, RIGHT, CENTER
* - Events:
* - Selection
*
*
* Note: Only one of the styles ARROW, CHECK, PUSH, RADIO, and TOGGLE
* may be specified.
*
* Note: Only one of the styles LEFT, RIGHT, and CENTER may be specified.
*
* Note: Only one of the styles UP, DOWN, LEFT, and RIGHT may be specified
* when the ARROW style is specified.
*
* IMPORTANT: This class is intended to be subclassed only
* within the SWT implementation.
*
* @since 1.0
*/
public class Button extends Control {
private String text = "";
private boolean selected;
private boolean grayed;
private Image image;
private boolean isDefault;
/**
* Constructs a new instance of this class given its parent
* and a style value describing its behavior and appearance.
*
* The style value is either one of the style constants defined in
* class SWT which is applicable to instances of this
* class, or must be built by bitwise OR'ing together
* (that is, using the int "|" operator) two or more
* of those SWT style constants. The class description
* lists the style constants that are applicable to the class.
* Style bits are also inherited from superclasses.
*
*
* @param parent a composite control which will be the parent of the new instance (cannot be null)
* @param style the style of control to construct
*
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - if the parent is null
*
* @exception SWTException
* - ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
* - ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
*
*
*
* @see SWT#CHECK
* @see SWT#PUSH
* @see SWT#RADIO
* @see SWT#TOGGLE
* @see SWT#FLAT
* @see SWT#LEFT
* @see SWT#RIGHT
* @see SWT#CENTER
* @see Widget#checkSubclass
* @see Widget#getStyle
*/
// TODO [rst] Remove comments from javadoc when fully implemented
public Button( Composite parent, int style ) {
super( parent, checkStyle( style ) );
}
@Override
void initState() {
if( ( style & ( SWT.PUSH | SWT.TOGGLE ) ) == 0 ) {
addState( THEME_BACKGROUND );
}
}
////////////////
// Getter/setter
/**
* Sets the receiver's text.
*
* This method sets the button label. The label may include
* the mnemonic character but must not contain line delimiters.
*
*
*
* Mnemonics are indicated by an '&' that causes the next
* character to be the mnemonic. When the user presses a
* key sequence that matches the mnemonic, a selection
* event occurs. On most platforms, the mnemonic appears
* underlined but may be emphasised in a platform specific
* manner. The mnemonic indicator character '&' can be
* escaped by doubling it in the string, causing a single
* '&' to be displayed.
*
*
* @param text the new text
*
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - if the text is null
*
* @exception SWTException
* - ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* - ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*/
public void setText( String text ) {
checkWidget();
if( text == null ) {
SWT.error( SWT.ERROR_NULL_ARGUMENT );
}
if( ( style & SWT.ARROW ) == 0 ) {
if( isMarkupEnabledFor( this ) && !isValidationDisabledFor( this ) ) {
MarkupValidator.getInstance().validate( text );
}
this.text = text;
}
}
/**
* Returns the receiver's text, which will be an empty
* string if it has never been set.
*
* @return the receiver's text
*
* @exception SWTException
* - ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* - ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*/
// TODO [rst] Remove comments from javadoc when fully implemented
public String getText() {
checkWidget();
return text;
}
/**
* Returns true if the receiver is selected,
* and false otherwise.
*
* When the receiver is of type CHECK or RADIO,
* it is selected when it is checked. When it is of type TOGGLE,
* it is selected when it is pushed in. If the receiver is of any other type,
* this method returns false.
*
* @return the selection state
*
* @exception SWTException
* - ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* - ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*/
public boolean getSelection() {
checkWidget();
boolean result = false;
if( ( style & ( SWT.CHECK | SWT.RADIO | SWT.TOGGLE ) ) != 0 ) {
result = selected;
}
return result;
}
/**
* Sets the selection state of the receiver, if it is of type CHECK,
* RADIO, or TOGGLE.
*
*
* When the receiver is of type CHECK or RADIO,
* it is selected when it is checked. When it is of type TOGGLE,
* it is selected when it is pushed in.
*
* @param selected the new selection state
*
* @exception SWTException
* - ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* - ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*/
public void setSelection( boolean selected ) {
checkWidget();
if( ( style & ( SWT.CHECK | SWT.RADIO | SWT.TOGGLE ) ) != 0 ) {
this.selected = selected;
}
}
/**
* Returns true if the receiver is grayed,
* and false otherwise. When the widget does not have
* the CHECK style, return false.
*
* @return the grayed state of the checkbox
*
* @exception SWTException
* - ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* - ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*
* @since 1.2
*/
public boolean getGrayed () {
checkWidget();
boolean result = false;
if( ( style & SWT.CHECK ) != 0 ) {
result = grayed;
}
return result;
}
/**
* Sets the grayed state of the receiver. This state change
* only applies if the control was created with the SWT.CHECK
* style.
*
* @param grayed the new grayed state
*
* @exception SWTException
* - ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* - ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*
* @since 1.2
*/
public void setGrayed( boolean grayed ) {
checkWidget();
if( ( style & SWT.CHECK ) != 0 ) {
this.grayed = grayed;
}
}
/**
* Returns the receiver's image if it has one, or null
* if it does not.
*
* @return the receiver's image
*
* @exception SWTException
* - ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* - ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*/
public Image getImage() {
checkWidget();
return image;
}
/**
* Sets the receiver's image to the argument, which may be
* null indicating that no image should be displayed.
*
* @param image the image to display on the receiver (may be null)
*
* @exception IllegalArgumentException
* - ERROR_INVALID_ARGUMENT - if the image has been disposed
*
* @exception SWTException
* - ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* - ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*/
public void setImage( Image image ) {
checkWidget();
if( image != null && image.isDisposed() ) {
SWT.error( SWT.ERROR_INVALID_ARGUMENT );
}
if( ( style & SWT.ARROW ) == 0 ) {
this.image = image;
}
}
/**
* Returns a value which describes the position of the
* text or image in the receiver. The value will be one of
* LEFT, RIGHT or CENTER
* unless the receiver is an ARROW button, in
* which case, the alignment will indicate the direction of
* the arrow (one of LEFT, RIGHT,
* UP or DOWN)
*
* @return the alignment
*
* @exception SWTException
* - ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* - ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*/
// TODO [rst] Remove comments from javadoc when fully implemented
public int getAlignment() {
checkWidget();
int result;
if( ( style & SWT.ARROW ) != 0 ) {
if( ( style & SWT.UP ) != 0 ) {
result = SWT.UP;
} else if( ( style & SWT.DOWN ) != 0 ) {
result = SWT.DOWN;
} else if( ( style & SWT.LEFT ) != 0 ) {
result = SWT.LEFT;
} else if( ( style & SWT.RIGHT ) != 0 ) {
result = SWT.RIGHT;
} else {
result = SWT.UP;
}
} else {
if( ( style & SWT.LEFT ) != 0 ) {
result = SWT.LEFT;
} else if( ( style & SWT.CENTER ) != 0 ) {
result = SWT.CENTER;
} else if( ( style & SWT.RIGHT ) != 0 ) {
result = SWT.RIGHT;
} else {
result = SWT.LEFT;
}
}
return result;
}
/**
* Controls how text, images and arrows will be displayed
* in the receiver. The argument should be one of
* LEFT, RIGHT or CENTER
* .
*
* @param alignment the new alignment
*
* @exception SWTException
* - ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* - ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*/
// TODO [rst] Remove comments from javadoc when fully implemented
public void setAlignment( int alignment ) {
checkWidget();
if( ( style & SWT.ARROW ) != 0 ) {
if( ( style & ( SWT.UP | SWT.DOWN | SWT.LEFT | SWT.RIGHT ) ) != 0 ) {
style &= ~( SWT.UP | SWT.DOWN | SWT.LEFT | SWT.RIGHT );
style |= alignment & ( SWT.UP | SWT.DOWN | SWT.LEFT | SWT.RIGHT );
}
} else if( ( alignment & ( SWT.LEFT | SWT.RIGHT | SWT.CENTER ) ) != 0 ) {
style &= ~( SWT.LEFT | SWT.RIGHT | SWT.CENTER );
style |= alignment & ( SWT.LEFT | SWT.RIGHT | SWT.CENTER );
}
}
@Override
public Point computeSize( int wHint, int hHint, boolean changed ) {
checkWidget();
int width = 0;
int height = 0;
ButtonThemeAdapter themeAdapter = getThemeAdapter();
BoxDimensions padding = themeAdapter.getPadding( this );
if( ( style & SWT.ARROW ) != 0 ) {
Size arrowSize = themeAdapter.getArrowSize( this );
width = arrowSize.width;
height = arrowSize.height;
} else {
boolean hasImage = image != null;
boolean hasText = text.length() > 0;
Font font = getFont();
if( ( style & ( SWT.CHECK | SWT.RADIO ) ) != 0 ) {
Size checkSize = themeAdapter.getCheckSize( this );
width += checkSize.width;
if( hasText || hasImage ) {
width += themeAdapter.getCheckSpacing( this );
}
height = Math.max( height, checkSize.height );
}
if( hasImage ) {
Rectangle imageBounds = image.getBounds();
width += imageBounds.width;
height = Math.max( height, imageBounds.height );
}
if( hasText && hasImage ) {
width += themeAdapter.getSpacing( this );
}
if( hasText ) {
Point extent;
boolean markupEnabled = isMarkupEnabledFor( this );
int wrapWidth = SWT.DEFAULT;
if( ( style & SWT.WRAP ) != 0 && wHint != SWT.DEFAULT ) {
wrapWidth = wHint - width - ( padding.left + padding.right );
}
extent = textExtent( font, text, wrapWidth, markupEnabled );
width += extent.x;
height = Math.max( height, extent.y );
}
if( height == 0 ) {
height = getCharHeight( font );
}
}
width += padding.left + padding.right;
height += padding.top + padding.bottom;
if( wHint != SWT.DEFAULT ) {
width = wHint;
}
if( hHint != SWT.DEFAULT ) {
height = hHint;
}
BoxDimensions border = getBorder();
width += border.left + border.right;
height += border.top + border.bottom;
return new Point( width, height );
}
/**
* Adds the listener to the collection of listeners who will
* be notified when the control is selected, by sending
* it one of the messages defined in the SelectionListener
* interface.
*
* widgetSelected is called when the control is selected.
* widgetDefaultSelected is not called.
*
*
* @param listener the listener which should be notified
*
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - if the listener is null
*
* @exception SWTException
* - ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* - ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*
* @see SelectionListener
* @see #removeSelectionListener
* @see SelectionEvent
*/
public void addSelectionListener( SelectionListener listener ) {
checkWidget();
if( listener == null ) {
SWT.error( SWT.ERROR_NULL_ARGUMENT );
}
TypedListener typedListener = new TypedListener( listener );
addListener( SWT.Selection, typedListener );
addListener( SWT.DefaultSelection, typedListener );
}
/**
* Removes the listener from the collection of listeners who will
* be notified when the control is selected.
*
* @param listener the listener which should no longer be notified
*
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - if the listener is null
*
* @exception SWTException
* - ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* - ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*
* @see SelectionListener
* @see #addSelectionListener
*/
public void removeSelectionListener( SelectionListener listener ) {
checkWidget();
if( listener == null ) {
SWT.error( SWT.ERROR_NULL_ARGUMENT );
}
removeListener( SWT.Selection, listener );
removeListener( SWT.DefaultSelection, listener );
}
@Override
public void setData( String key, Object value ) {
if( RWT.BADGE.equals( key ) && ( style & SWT.PUSH ) == 0 ) {
return;
} else if( RWT.MARKUP_ENABLED.equals( key ) && isMarkupEnabledFor( this ) ) {
return;
}
checkMarkupPrecondition( key, TEXT, () -> text.isEmpty() );
super.setData( key, value );
}
@Override
@SuppressWarnings( "unchecked" )
public T getAdapter( Class adapter ) {
if( adapter == WidgetLCA.class ) {
return ( T )ButtonLCA.INSTANCE;
}
return super.getAdapter( adapter );
}
void setDefault( boolean isDefault ) {
this.isDefault = isDefault;
}
boolean getDefault() {
return isDefault;
}
@Override
boolean isTabGroup() {
return true;
}
@Override
String getNameText() {
return getText();
}
private static int checkStyle( int style ) {
int result = checkBits( style,
SWT.PUSH,
SWT.ARROW,
SWT.CHECK,
SWT.RADIO,
SWT.TOGGLE,
0 );
if( ( result & ( SWT.PUSH | SWT.TOGGLE ) ) != 0 ) {
result = checkBits( result, SWT.CENTER, SWT.LEFT, SWT.RIGHT, 0, 0, 0 );
} else if( ( result & ( SWT.CHECK | SWT.RADIO ) ) != 0 ) {
result = checkBits( result, SWT.LEFT, SWT.RIGHT, SWT.CENTER, 0, 0, 0 );
} else if( ( result & SWT.ARROW ) != 0 ) {
result |= SWT.NO_FOCUS;
result = checkBits( result, SWT.UP, SWT.DOWN, SWT.LEFT, SWT.RIGHT, 0, 0 );
}
return result;
}
private ButtonThemeAdapter getThemeAdapter() {
return ( ButtonThemeAdapter )getAdapter( ThemeAdapter.class );
}
}
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