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/*******************************************************************************
 * Copyright (c) 2000, 2018 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.swt.widgets;


import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.gtk.*;
import org.eclipse.swt.internal.gtk3.*;
import org.eclipse.swt.internal.gtk4.*;

/**
 * Instances of this class provide an etched border
 * with an optional title.
 * 

* Shadow styles are hints and may not be honoured * by the platform. To create a group with the * default shadow style for the platform, do not * specify a shadow style. *

*
Styles:
*
SHADOW_ETCHED_IN, SHADOW_ETCHED_OUT, SHADOW_IN, SHADOW_OUT, SHADOW_NONE
*
Events:
*
(none)
*
*

* Note: Only one of the above styles may be specified. *

* IMPORTANT: This class is not intended to be subclassed. *

* * @see SWT Example: ControlExample * @see Sample code and further information * @noextend This class is not intended to be subclassed by clients. */ public class Group extends Composite { long clientHandle, labelHandle; String text = ""; // We use this to keep track of the foreground color GdkRGBA foreground; /** * 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#SHADOW_ETCHED_IN * @see SWT#SHADOW_ETCHED_OUT * @see SWT#SHADOW_IN * @see SWT#SHADOW_OUT * @see SWT#SHADOW_NONE * @see Widget#checkSubclass * @see Widget#getStyle */ public Group (Composite parent, int style) { super (parent, checkStyle (style)); } static int checkStyle (int style) { style |= SWT.NO_FOCUS; /* * Even though it is legal to create this widget * with scroll bars, they serve no useful purpose * because they do not automatically scroll the * widget's client area. The fix is to clear * the SWT style. */ return style & ~(SWT.H_SCROLL | SWT.V_SCROLL); } @Override protected void checkSubclass () { if (!isValidSubclass ()) error (SWT.ERROR_INVALID_SUBCLASS); } @Override long clientHandle () { return clientHandle; } @Override Point computeSizeInPixels (int wHint, int hHint, boolean changed) { Point size = super.computeSizeInPixels(wHint, hHint, changed); int width = computeNativeSize (handle, SWT.DEFAULT, SWT.DEFAULT, false).x; size.x = Math.max (size.x, width); return size; } @Override Rectangle computeTrimInPixels (int x, int y, int width, int height) { checkWidget(); forceResize (); GtkAllocation allocation = new GtkAllocation(); GTK.gtk_widget_get_allocation (clientHandle, allocation); int clientX = allocation.x; int clientY = allocation.y; x -= clientX; y -= clientY; width += clientX + clientX; height += clientX + clientY; return new Rectangle (x, y, width, height); } @Override Rectangle getClientAreaInPixels () { Rectangle clientRectangle = super.getClientAreaInPixels (); /* * Bug 453827 Child position fix. * SWT's calls to gtk_widget_size_allocate and gtk_widget_set_allocation * causes GTK+ to move the clientHandle's SwtFixed down by the size of the label. * These calls can come up from 'shell' and group has no control over these calls. * * This is an undesired side-effect. Client handle's x & y positions should never * be incremented as this is an internal sub-container. * * Note: 0 by 0 was chosen as 1 by 1 shifts controls beyond their original pos. * The long term fix would be to not use widget_*_allocation from higher containers * like shell and to not use gtkframe in non-group widgets (e.g used in label atm). */ clientRectangle.x = 0; clientRectangle.y = 0; return clientRectangle; } @Override GdkRGBA getContextColorGdkRGBA () { if (foreground != null) { return foreground; } else { return display.COLOR_WIDGET_FOREGROUND_RGBA; } } @Override GdkRGBA getContextBackgroundGdkRGBA () { return super.getContextBackgroundGdkRGBA(); } @Override void createHandle(int index) { state |= HANDLE | THEME_BACKGROUND; fixedHandle = OS.g_object_new (display.gtk_fixed_get_type (), 0); if (fixedHandle == 0) error (SWT.ERROR_NO_HANDLES); if (!GTK.GTK4) GTK3.gtk_widget_set_has_window(fixedHandle, true); handle = GTK.gtk_frame_new (null); if (handle == 0) error (SWT.ERROR_NO_HANDLES); labelHandle = GTK.gtk_label_new (null); if (labelHandle == 0) error (SWT.ERROR_NO_HANDLES); OS.g_object_ref_sink (labelHandle); clientHandle = OS.g_object_new (display.gtk_fixed_get_type (), 0); if (clientHandle == 0) error (SWT.ERROR_NO_HANDLES); /* * Bug 453827 - clientHandle now has it's own window so that * it can listen to events (clicking/tooltip etc.) and so that * background can be drawn on it. */ if (!GTK.GTK4) GTK3.gtk_widget_set_has_window(clientHandle, true); if (GTK.GTK4) { OS.swt_fixed_add(fixedHandle, handle); GTK4.gtk_frame_set_child(handle, clientHandle); } else { GTK3.gtk_container_add (fixedHandle, handle); GTK3.gtk_container_add (handle, clientHandle); if ((style & SWT.SHADOW_IN) != 0) { GTK3.gtk_frame_set_shadow_type (handle, GTK.GTK_SHADOW_IN); } if ((style & SWT.SHADOW_OUT) != 0) { GTK3.gtk_frame_set_shadow_type (handle, GTK.GTK_SHADOW_OUT); } if ((style & SWT.SHADOW_ETCHED_IN) != 0) { GTK3.gtk_frame_set_shadow_type (handle, GTK.GTK_SHADOW_ETCHED_IN); } if ((style & SWT.SHADOW_ETCHED_OUT) != 0) { GTK3.gtk_frame_set_shadow_type (handle, GTK.GTK_SHADOW_ETCHED_OUT); } } // In GTK 3 font description is inherited from parent widget which is not how SWT has always worked, // reset to default font to get the usual behavior setFontDescription (defaultFont ().handle); } @Override int applyThemeBackground () { return 1; } @Override void deregister () { super.deregister (); display.removeWidget (clientHandle); display.removeWidget (labelHandle); } @Override void enableWidget (boolean enabled) { GTK.gtk_widget_set_sensitive (labelHandle, enabled); } @Override long eventHandle () { /* * Bug 453827 - Group's events should be handled via it's internal * fixed container (clientHandle) and not via it's top level. * This makes it behave more like composite. */ return clientHandle; } @Override String getNameText () { return getText (); } /** * Returns the receiver's text, which is the string that the * is used as the title. If the text has not previously * been set, returns an empty string. * * @return the 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
  • *
*/ public String getText () { checkWidget(); return text; } @Override void hookEvents () { super.hookEvents(); if (labelHandle != 0) { OS.g_signal_connect_closure_by_id (labelHandle, display.signalIds [MNEMONIC_ACTIVATE], 0, display.getClosure (MNEMONIC_ACTIVATE), false); } } @Override boolean mnemonicHit (char key) { if (labelHandle == 0) return false; boolean result = super.mnemonicHit (labelHandle, key); if (result) setFocus (); return result; } @Override boolean mnemonicMatch (char key) { if (labelHandle == 0) return false; return mnemonicMatch (labelHandle, key); } @Override long parentingHandle() { /* * Bug 453827 - Children should be attached to the internal fixed * subcontainer (clienthandle) and not the top-level fixedHandle. */ return clientHandle; } @Override void register () { super.register (); display.addWidget (clientHandle, this); display.addWidget (labelHandle, this); } @Override void releaseHandle () { super.releaseHandle (); clientHandle = labelHandle = 0; } @Override void releaseWidget () { super.releaseWidget (); if (labelHandle != 0) OS.g_object_unref (labelHandle); text = null; } @Override void setFontDescription (long font) { super.setFontDescription (font); setFontDescription (labelHandle, font); } @Override void setForegroundGdkRGBA (long handle, GdkRGBA rgba) { /* * When using CSS, setting the foreground color on an empty label * widget prevents the background from being set. If a user wants * to specify a foreground color before the text is set, store the * color and wait until text is specified to apply it. */ if (text != null && !text.isEmpty()) { super.setForegroundGdkRGBA (labelHandle, rgba); } foreground = rgba; } @Override void setForegroundGdkRGBA (GdkRGBA rgba) { super.setForegroundGdkRGBA(rgba); setForegroundGdkRGBA (labelHandle, rgba); } @Override void setOrientation (boolean create) { super.setOrientation (create); if ((style & SWT.RIGHT_TO_LEFT) != 0 || !create) { int dir = (style & SWT.RIGHT_TO_LEFT) != 0 ? GTK.GTK_TEXT_DIR_RTL : GTK.GTK_TEXT_DIR_LTR; GTK.gtk_widget_set_direction (labelHandle, dir); } } /** * Sets the receiver's text, which is the string that will * be displayed as the receiver's title, to the argument, * which may not be null. The string may include the mnemonic character. *

* 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, focus is assigned * to the first child of the group. 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. *

* Note: If control characters like '\n', '\t' etc. are used * in the string, then the behavior is platform dependent. *

* @param string 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 string) { checkWidget(); if (string == null) error (SWT.ERROR_NULL_ARGUMENT); text = string; char [] chars = fixMnemonic (string); byte [] buffer = Converter.wcsToMbcs (chars, true); GTK.gtk_label_set_text_with_mnemonic (labelHandle, buffer); if (string.length () != 0) { if (GTK.gtk_frame_get_label_widget (handle) == 0) { GTK.gtk_frame_set_label_widget (handle, labelHandle); } } else { GTK.gtk_frame_set_label_widget (handle, 0); } // Set the foreground now that the text has been set if (foreground != null) { setForegroundGdkRGBA (labelHandle, foreground); } } @Override void showWidget () { super.showWidget (); if (clientHandle != 0) GTK.gtk_widget_show (clientHandle); if (labelHandle != 0) GTK.gtk_widget_show (labelHandle); } @Override int setBounds(int x, int y, int width, int height, boolean move, boolean resize) { // Work around for bug 470129. // See also https://bugzilla.gnome.org/show_bug.cgi?id=754976 : // GtkFrame: Attempt to allocate size of width 1 (or a small number) fails // // GtkFrame does not handle well allocating less than its minimum size GtkRequisition requisition = new GtkRequisition(); GTK.gtk_widget_get_preferred_size(handle, requisition, null); /* * Feature in GTK3.20+: size calculations take into account GtkCSSNode * elements which we cannot access. If the to-be-allocated size minus * these elements is < 0, allocate the preferred size instead. */ width = (width - (requisition.width - width)) < 0 ? requisition.width : width; height = (height - (requisition.height - height)) < 0 ? requisition.height : height; return super.setBounds(x, y, width, height, move, resize); } @Override long paintHandle() { if (GTK.GTK4) return clientHandle; long topHandle = topHandle (); /* we draw all our children on the clientHandle*/ long paintHandle = clientHandle; while (paintHandle != topHandle) { if (GTK3.gtk_widget_get_has_window(paintHandle)) break; paintHandle = GTK.gtk_widget_get_parent (paintHandle); } return paintHandle; } @Override long paintWindow () { long paintHandle = clientHandle; GTK.gtk_widget_realize (paintHandle); return gtk_widget_get_window (paintHandle); } @Override long paintSurface () { long paintHandle = clientHandle; GTK.gtk_widget_realize (paintHandle); return gtk_widget_get_surface (paintHandle); } }




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