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qwidgetaction.cpp

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1/****************************************************************************-
2**-
3** Copyright (C) 2016 The Qt Company Ltd.-
4** Contact: https://www.qt.io/licensing/-
5**-
6** This file is part of the QtWidgets module of the Qt Toolkit.-
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38****************************************************************************/-
39-
40#include "qwidgetaction.h"-
41#include "qdebug.h"-
42-
43#ifndef QT_NO_ACTION-
44#include "qwidgetaction_p.h"-
45-
46QT_BEGIN_NAMESPACE-
47-
48/*!-
49 \class QWidgetAction-
50 \since 4.2-
51 \brief The QWidgetAction class extends QAction by an interface-
52 for inserting custom widgets into action based containers, such-
53 as toolbars.-
54-
55 \ingroup mainwindow-classes-
56 \inmodule QtWidgets-
57-
58 Most actions in an application are represented as items in menus or-
59 buttons in toolbars. However sometimes more complex widgets are-
60 necessary. For example a zoom action in a word processor may be-
61 realized using a QComboBox in a QToolBar, presenting a range-
62 of different zoom levels. QToolBar provides QToolBar::insertWidget()-
63 as convenience function for inserting a single widget.-
64 However if you want to implement an action that uses custom-
65 widgets for visualization in multiple containers then you have to-
66 subclass QWidgetAction.-
67-
68 If a QWidgetAction is added for example to a QToolBar then-
69 QWidgetAction::createWidget() is called. Reimplementations of that-
70 function should create a new custom widget with the specified parent.-
71-
72 If the action is removed from a container widget then-
73 QWidgetAction::deleteWidget() is called with the previously created custom-
74 widget as argument. The default implementation hides the widget and deletes-
75 it using QObject::deleteLater().-
76-
77 If you have only one single custom widget then you can set it as default-
78 widget using setDefaultWidget(). That widget will then be used if the-
79 action is added to a QToolBar, or in general to an action container that-
80 supports QWidgetAction. If a QWidgetAction with only a default widget is-
81 added to two toolbars at the same time then the default widget is shown-
82 only in the first toolbar the action was added to. QWidgetAction takes-
83 over ownership of the default widget.-
84-
85 Note that it is up to the widget to activate the action, for example by-
86 reimplementing mouse event handlers and calling QAction::trigger().-
87-
88 \b {\macos}: If you add a widget to a menu in the application's menu-
89 bar on \macos, the widget will be added and it will function but with some-
90 limitations:-
91 \list 1-
92 \li The widget is reparented away from the QMenu to the native menu-
93 view. If you show the menu in some other place (e.g. as a popup menu),-
94 the widget will not be there.-
95 \li Focus/Keyboard handling of the widget is not possible.-
96 \li Due to Apple's design, mouse tracking on the widget currently does-
97 not work.-
98 \li Connecting the triggered() signal to a slot that opens a modal-
99 dialog will cause a crash in \macos 10.4 (known bug acknowledged-
100 by Apple), a workaround is to use a QueuedConnection instead of a-
101 DirectConnection.-
102 \endlist-
103-
104 \sa QAction, QActionGroup, QWidget-
105*/-
106-
107/*!-
108 Constructs an action with \a parent.-
109*/-
110QWidgetAction::QWidgetAction(QObject *parent)-
111 : QAction(*(new QWidgetActionPrivate), parent)-
112{-
113}
never executed: end of block
0
114-
115/*!-
116 Destroys the object and frees allocated resources.-
117*/-
118QWidgetAction::~QWidgetAction()-
119{-
120 Q_D(QWidgetAction);-
121 for (int i = 0; i < d->createdWidgets.count(); ++i)
i < d->createdWidgets.count()Description
TRUEnever evaluated
FALSEnever evaluated
0
122 disconnect(d->createdWidgets.at(i), SIGNAL(destroyed(QObject*)),
never executed: disconnect(d->createdWidgets.at(i), qFlagLocation("2""destroyed(QObject*)" "\0" __FILE__ ":" "122"), this, qFlagLocation("1""_q_widgetDestroyed(QObject*)" "\0" __FILE__ ":" "123"));
0
123 this, SLOT(_q_widgetDestroyed(QObject*)));
never executed: disconnect(d->createdWidgets.at(i), qFlagLocation("2""destroyed(QObject*)" "\0" __FILE__ ":" "122"), this, qFlagLocation("1""_q_widgetDestroyed(QObject*)" "\0" __FILE__ ":" "123"));
0
124 QList<QWidget *> widgetsToDelete = d->createdWidgets;-
125 d->createdWidgets.clear();-
126 qDeleteAll(widgetsToDelete);-
127 delete d->defaultWidget;-
128}
never executed: end of block
0
129-
130/*!-
131 Sets \a widget to be the default widget. The ownership is-
132 transferred to QWidgetAction. Unless createWidget() is-
133 reimplemented by a subclass to return a new widget the default-
134 widget is used when a container widget requests a widget through-
135 requestWidget().-
136*/-
137void QWidgetAction::setDefaultWidget(QWidget *widget)-
138{-
139 Q_D(QWidgetAction);-
140 if (widget == d->defaultWidget || d->defaultWidgetInUse)
widget == d->defaultWidgetDescription
TRUEnever evaluated
FALSEnever evaluated
d->defaultWidgetInUseDescription
TRUEnever evaluated
FALSEnever evaluated
0
141 return;
never executed: return;
0
142 delete d->defaultWidget;-
143 d->defaultWidget = widget;-
144 if (!widget)
!widgetDescription
TRUEnever evaluated
FALSEnever evaluated
0
145 return;
never executed: return;
0
146-
147 setVisible(!(widget->isHidden() && widget->testAttribute(Qt::WA_WState_ExplicitShowHide)));-
148 d->defaultWidget->hide();-
149 d->defaultWidget->setParent(0);-
150 d->defaultWidgetInUse = false;-
151 if (!isEnabled())
!isEnabled()Description
TRUEnever evaluated
FALSEnever evaluated
0
152 d->defaultWidget->setEnabled(false);
never executed: d->defaultWidget->setEnabled(false);
0
153}
never executed: end of block
0
154-
155/*!-
156 Returns the default widget.-
157*/-
158QWidget *QWidgetAction::defaultWidget() const-
159{-
160 Q_D(const QWidgetAction);-
161 return d->defaultWidget;
never executed: return d->defaultWidget;
0
162}-
163-
164/*!-
165 Returns a widget that represents the action, with the given \a-
166 parent.-
167-
168 Container widgets that support actions can call this function to-
169 request a widget as visual representation of the action.-
170-
171 \sa releaseWidget(), createWidget(), defaultWidget()-
172*/-
173QWidget *QWidgetAction::requestWidget(QWidget *parent)-
174{-
175 Q_D(QWidgetAction);-
176-
177 QWidget *w = createWidget(parent);-
178 if (!w) {
!wDescription
TRUEnever evaluated
FALSEnever evaluated
0
179 if (d->defaultWidgetInUse || !d->defaultWidget)
d->defaultWidgetInUseDescription
TRUEnever evaluated
FALSEnever evaluated
!d->defaultWidgetDescription
TRUEnever evaluated
FALSEnever evaluated
0
180 return 0;
never executed: return 0;
0
181 d->defaultWidget->setParent(parent);-
182 d->defaultWidgetInUse = true;-
183 return d->defaultWidget;
never executed: return d->defaultWidget;
0
184 }-
185-
186 connect(w, SIGNAL(destroyed(QObject*)),-
187 this, SLOT(_q_widgetDestroyed(QObject*)));-
188 d->createdWidgets.append(w);-
189 return w;
never executed: return w;
0
190}-
191-
192/*!-
193 Releases the specified \a widget.-
194-
195 Container widgets that support actions call this function when a widget-
196 action is removed.-
197-
198 \sa requestWidget(), deleteWidget(), defaultWidget()-
199*/-
200void QWidgetAction::releaseWidget(QWidget *widget)-
201{-
202 Q_D(QWidgetAction);-
203-
204 if (widget == d->defaultWidget) {
widget == d->defaultWidgetDescription
TRUEnever evaluated
FALSEnever evaluated
0
205 d->defaultWidget->hide();-
206 d->defaultWidget->setParent(0);-
207 d->defaultWidgetInUse = false;-
208 return;
never executed: return;
0
209 }-
210-
211 if (!d->createdWidgets.contains(widget))
!d->createdWid...ntains(widget)Description
TRUEnever evaluated
FALSEnever evaluated
0
212 return;
never executed: return;
0
213-
214 disconnect(widget, SIGNAL(destroyed(QObject*)),-
215 this, SLOT(_q_widgetDestroyed(QObject*)));-
216 d->createdWidgets.removeAll(widget);-
217 deleteWidget(widget);-
218}
never executed: end of block
0
219-
220/*!-
221 \reimp-
222*/-
223bool QWidgetAction::event(QEvent *event)-
224{-
225 Q_D(QWidgetAction);-
226 if (event->type() == QEvent::ActionChanged) {
event->type() ...:ActionChangedDescription
TRUEnever evaluated
FALSEnever evaluated
0
227 if (d->defaultWidget)
d->defaultWidgetDescription
TRUEnever evaluated
FALSEnever evaluated
0
228 d->defaultWidget->setEnabled(isEnabled());
never executed: d->defaultWidget->setEnabled(isEnabled());
0
229 for (int i = 0; i < d->createdWidgets.count(); ++i)
i < d->createdWidgets.count()Description
TRUEnever evaluated
FALSEnever evaluated
0
230 d->createdWidgets.at(i)->setEnabled(isEnabled());
never executed: d->createdWidgets.at(i)->setEnabled(isEnabled());
0
231 }
never executed: end of block
0
232 return QAction::event(event);
never executed: return QAction::event(event);
0
233}-
234-
235/*!-
236 \reimp-
237 */-
238bool QWidgetAction::eventFilter(QObject *obj, QEvent *event)-
239{-
240 return QAction::eventFilter(obj,event);
never executed: return QAction::eventFilter(obj,event);
0
241}-
242-
243/*!-
244 This function is called whenever the action is added to a container widget-
245 that supports custom widgets. If you don't want a custom widget to be-
246 used as representation of the action in the specified \a parent widget then-
247 0 should be returned.-
248-
249 \sa deleteWidget()-
250*/-
251QWidget *QWidgetAction::createWidget(QWidget *parent)-
252{-
253 Q_UNUSED(parent)-
254 return 0;
never executed: return 0;
0
255}-
256-
257/*!-
258 This function is called whenever the action is removed from a-
259 container widget that displays the action using a custom \a-
260 widget previously created using createWidget(). The default-
261 implementation hides the \a widget and schedules it for deletion-
262 using QObject::deleteLater().-
263-
264 \sa createWidget()-
265*/-
266void QWidgetAction::deleteWidget(QWidget *widget)-
267{-
268 widget->hide();-
269 widget->deleteLater();-
270}
never executed: end of block
0
271-
272/*!-
273 Returns the list of widgets that have been using createWidget() and-
274 are currently in use by widgets the action has been added to.-
275*/-
276QList<QWidget *> QWidgetAction::createdWidgets() const-
277{-
278 Q_D(const QWidgetAction);-
279 return d->createdWidgets;
never executed: return d->createdWidgets;
0
280}-
281-
282QT_END_NAMESPACE-
283-
284#include "moc_qwidgetaction.cpp"-
285-
286#endif // QT_NO_ACTION-
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