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 Qt Designer of the Qt Toolkit. |
7 | ** |
8 | ** $QT_BEGIN_LICENSE:GPL-EXCEPT$ |
9 | ** Commercial License Usage |
10 | ** Licensees holding valid commercial Qt licenses may use this file in |
11 | ** accordance with the commercial license agreement provided with the |
12 | ** Software or, alternatively, in accordance with the terms contained in |
13 | ** a written agreement between you and The Qt Company. For licensing terms |
14 | ** and conditions see https://www.qt.io/terms-conditions. For further |
15 | ** information use the contact form at https://www.qt.io/contact-us. |
16 | ** |
17 | ** GNU General Public License Usage |
18 | ** Alternatively, this file may be used under the terms of the GNU |
19 | ** General Public License version 3 as published by the Free Software |
20 | ** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT |
21 | ** included in the packaging of this file. Please review the following |
22 | ** information to ensure the GNU General Public License requirements will |
23 | ** be met: https://www.gnu.org/licenses/gpl-3.0.html. |
24 | ** |
25 | ** $QT_END_LICENSE$ |
26 | ** |
27 | ****************************************************************************/ |
28 | |
29 | #include "qdesigner_widgetitem_p.h" |
30 | #include "qdesigner_widget_p.h" |
31 | #include "widgetfactory_p.h" |
32 | |
33 | #include <QtDesigner/abstractformwindow.h> |
34 | #include <QtDesigner/qextensionmanager.h> |
35 | #include <QtDesigner/abstractformeditor.h> |
36 | #include <QtDesigner/container.h> |
37 | #include <QtDesigner/abstractwidgetdatabase.h> |
38 | |
39 | #include <QtWidgets/qboxlayout.h> |
40 | #include <QtWidgets/qgridlayout.h> |
41 | #include <QtWidgets/qformlayout.h> |
42 | #include <QtWidgets/qapplication.h> |
43 | |
44 | #include <QtCore/qtextstream.h> |
45 | #include <QtCore/qdebug.h> |
46 | #include <private/qlayout_p.h> |
47 | |
48 | QT_BEGIN_NAMESPACE |
49 | |
50 | enum { DebugWidgetItem = 0 }; |
51 | enum { MinimumLength = 10 }; |
52 | |
53 | // Widget item creation function to be registered as factory method with |
54 | // QLayoutPrivate |
55 | static QWidgetItem *createDesignerWidgetItem(const QLayout *layout, QWidget *widget) |
56 | { |
57 | Qt::Orientations orientations; |
58 | if (qdesigner_internal::QDesignerWidgetItem::check(layout, w: widget, ptrToOrientations: &orientations)) { |
59 | if (DebugWidgetItem) |
60 | qDebug() << "QDesignerWidgetItem: Creating on " << layout << widget << orientations; |
61 | return new qdesigner_internal::QDesignerWidgetItem(layout, widget, orientations); |
62 | } |
63 | if (DebugWidgetItem) |
64 | qDebug() << "QDesignerWidgetItem: Noncontainer: " << layout << widget; |
65 | |
66 | return nullptr; |
67 | } |
68 | |
69 | static QString sizePolicyToString(const QSizePolicy &p) |
70 | { |
71 | QString rc; { |
72 | QTextStream str(&rc); |
73 | str << "Control=" << p.controlType() << " expdirs=" << p.expandingDirections() |
74 | << " hasHeightForWidth=" << p.hasHeightForWidth() |
75 | << " H: Policy=" << p.horizontalPolicy() |
76 | << " stretch=" << p.horizontalStretch() |
77 | << " V: Policy=" << p.verticalPolicy() |
78 | << " stretch=" << p.verticalStretch(); |
79 | } |
80 | return rc; |
81 | } |
82 | |
83 | // Find the layout the item is contained in, recursing over |
84 | // child layouts |
85 | static const QLayout *findLayoutOfItem(const QLayout *haystack, const QLayoutItem *needle) |
86 | { |
87 | const int count = haystack->count(); |
88 | for (int i = 0; i < count; i++) { |
89 | QLayoutItem *item = haystack->itemAt(index: i); |
90 | if (item == needle) |
91 | return haystack; |
92 | if (QLayout *childLayout = item->layout()) |
93 | if (const QLayout *containing = findLayoutOfItem(haystack: childLayout, needle)) |
94 | return containing; |
95 | } |
96 | return nullptr; |
97 | } |
98 | |
99 | |
100 | namespace qdesigner_internal { |
101 | |
102 | // ------------------ QDesignerWidgetItem |
103 | QDesignerWidgetItem::QDesignerWidgetItem(const QLayout *containingLayout, QWidget *w, Qt::Orientations o) : |
104 | QWidgetItemV2(w), |
105 | m_orientations(o), |
106 | m_nonLaidOutMinSize(w->minimumSizeHint()), |
107 | m_nonLaidOutSizeHint(w->sizeHint()), |
108 | m_cachedContainingLayout(containingLayout) |
109 | { |
110 | // Initialize the minimum size to prevent nonlaid-out frames/widgets |
111 | // from being slammed to zero |
112 | const QSize minimumSize = w->minimumSize(); |
113 | if (!minimumSize.isEmpty()) |
114 | m_nonLaidOutMinSize = minimumSize; |
115 | expand(s: &m_nonLaidOutMinSize); |
116 | expand(s: &m_nonLaidOutSizeHint); |
117 | w->installEventFilter(filterObj: this); |
118 | connect(sender: containingLayout, signal: &QObject::destroyed, receiver: this, slot: &QDesignerWidgetItem::layoutChanged); |
119 | if (DebugWidgetItem ) |
120 | qDebug() << "QDesignerWidgetItem" << w << sizePolicyToString(p: w->sizePolicy()) << m_nonLaidOutMinSize << m_nonLaidOutSizeHint; |
121 | } |
122 | |
123 | void QDesignerWidgetItem::expand(QSize *s) const |
124 | { |
125 | // Expand the size if its too small |
126 | if (m_orientations & Qt::Horizontal && s->width() <= 0) |
127 | s->setWidth(MinimumLength); |
128 | if (m_orientations & Qt::Vertical && s->height() <= 0) |
129 | s->setHeight(MinimumLength); |
130 | } |
131 | |
132 | QSize QDesignerWidgetItem::minimumSize() const |
133 | { |
134 | // Just track the size in case we are laid-out or stretched. |
135 | const QSize baseMinSize = QWidgetItemV2::minimumSize(); |
136 | QWidget * w = constWidget(); |
137 | if (w->layout() || subjectToStretch(layout: containingLayout(), w)) { |
138 | m_nonLaidOutMinSize = baseMinSize; |
139 | return baseMinSize; |
140 | } |
141 | // Nonlaid out: Maintain last laid-out size |
142 | const QSize rc = baseMinSize.expandedTo(otherSize: m_nonLaidOutMinSize); |
143 | if (DebugWidgetItem > 1) |
144 | qDebug() << "minimumSize" << constWidget() << baseMinSize << rc; |
145 | return rc; |
146 | } |
147 | |
148 | QSize QDesignerWidgetItem::sizeHint() const |
149 | { |
150 | // Just track the size in case we are laid-out or stretched. |
151 | const QSize baseSizeHint = QWidgetItemV2::sizeHint(); |
152 | QWidget * w = constWidget(); |
153 | if (w->layout() || subjectToStretch(layout: containingLayout(), w)) { |
154 | m_nonLaidOutSizeHint = baseSizeHint; |
155 | return baseSizeHint; |
156 | } |
157 | // Nonlaid out: Maintain last laid-out size |
158 | const QSize rc = baseSizeHint.expandedTo(otherSize: m_nonLaidOutSizeHint); |
159 | if (DebugWidgetItem > 1) |
160 | qDebug() << "sizeHint" << constWidget() << baseSizeHint << rc; |
161 | return rc; |
162 | } |
163 | |
164 | bool QDesignerWidgetItem::subjectToStretch(const QLayout *layout, QWidget *w) |
165 | { |
166 | if (!layout) |
167 | return false; |
168 | // Are we under some stretch factor? |
169 | if (const QBoxLayout *bl = qobject_cast<const QBoxLayout *>(object: layout)) { |
170 | const int index = bl->indexOf(w); |
171 | Q_ASSERT(index != -1); |
172 | return bl->stretch(index) != 0; |
173 | } |
174 | if (const QGridLayout *cgl = qobject_cast<const QGridLayout *>(object: layout)) { |
175 | QGridLayout *gl = const_cast<QGridLayout *>(cgl); |
176 | const int index = cgl->indexOf(w); |
177 | Q_ASSERT(index != -1); |
178 | int row, column, rowSpan, columnSpan; |
179 | gl->getItemPosition (idx: index, row: &row, column: &column, rowSpan: &rowSpan, columnSpan: &columnSpan); |
180 | const int rend = row + rowSpan; |
181 | const int cend = column + columnSpan; |
182 | for (int r = row; r < rend; r++) |
183 | if (cgl->rowStretch(row: r) != 0) |
184 | return true; |
185 | for (int c = column; c < cend; c++) |
186 | if (cgl->columnStretch(column: c) != 0) |
187 | return true; |
188 | } |
189 | return false; |
190 | } |
191 | |
192 | /* Return the orientations mask for a layout, specifying |
193 | * in which directions squeezing should be prevented. */ |
194 | static Qt::Orientations layoutOrientation(const QLayout *layout) |
195 | { |
196 | if (const QBoxLayout *bl = qobject_cast<const QBoxLayout *>(object: layout)) { |
197 | const QBoxLayout::Direction direction = bl->direction(); |
198 | return direction == QBoxLayout::LeftToRight || direction == QBoxLayout::RightToLeft ? Qt::Horizontal : Qt::Vertical; |
199 | } |
200 | if (qobject_cast<const QFormLayout*>(object: layout)) |
201 | return Qt::Vertical; |
202 | return Qt::Horizontal|Qt::Vertical; |
203 | } |
204 | |
205 | // Check for a non-container extension container |
206 | bool QDesignerWidgetItem::isContainer(const QDesignerFormEditorInterface *core, QWidget *w) |
207 | { |
208 | if (!WidgetFactory::isFormEditorObject(o: w)) |
209 | return false; |
210 | const QDesignerWidgetDataBaseInterface *wdb = core->widgetDataBase(); |
211 | const int widx = wdb->indexOfObject(object: w); |
212 | if (widx == -1 || !wdb->item(index: widx)->isContainer()) |
213 | return false; |
214 | if (qt_extension<QDesignerContainerExtension*>(manager: core->extensionManager(), object: w)) |
215 | return false; |
216 | return true; |
217 | } |
218 | |
219 | bool QDesignerWidgetItem::check(const QLayout *layout, QWidget *w, Qt::Orientations *ptrToOrientations) |
220 | { |
221 | // Check for form-editor non-containerextension-containers (QFrame, etc) |
222 | // within laid-out form editor widgets. No check for managed() here as we |
223 | // want container pages and widgets in the process of being morphed as |
224 | // well. Avoid nested layouts (as the effective stretch cannot be easily |
225 | // computed and may mess things up). |
226 | if (ptrToOrientations) |
227 | *ptrToOrientations = {}; |
228 | |
229 | const QObject *layoutParent = layout->parent(); |
230 | if (!layoutParent || !layoutParent->isWidgetType() || !WidgetFactory::isFormEditorObject(o: layoutParent)) |
231 | return false; |
232 | |
233 | QDesignerFormWindowInterface *fw = QDesignerFormWindowInterface::findFormWindow(w); |
234 | if (!fw || !isContainer(core: fw->core(), w)) |
235 | return false; |
236 | |
237 | // If it is a box, restrict to its orientation |
238 | if (ptrToOrientations) |
239 | *ptrToOrientations = layoutOrientation(layout); |
240 | |
241 | return true; |
242 | } |
243 | |
244 | QSize QDesignerWidgetItem::nonLaidOutMinSize() const |
245 | { |
246 | return m_nonLaidOutMinSize; |
247 | } |
248 | |
249 | void QDesignerWidgetItem::setNonLaidOutMinSize(const QSize &s) |
250 | { |
251 | if (DebugWidgetItem > 1) |
252 | qDebug() << "setNonLaidOutMinSize" << constWidget() << s; |
253 | m_nonLaidOutMinSize = s; |
254 | } |
255 | |
256 | QSize QDesignerWidgetItem::nonLaidOutSizeHint() const |
257 | { |
258 | return m_nonLaidOutSizeHint; |
259 | } |
260 | |
261 | void QDesignerWidgetItem::setNonLaidOutSizeHint(const QSize &s) |
262 | { |
263 | if (DebugWidgetItem > 1) |
264 | qDebug() << "setNonLaidOutSizeHint" << constWidget() << s; |
265 | m_nonLaidOutSizeHint = s; |
266 | } |
267 | |
268 | void QDesignerWidgetItem::install() |
269 | { |
270 | QLayoutPrivate::widgetItemFactoryMethod = createDesignerWidgetItem; |
271 | } |
272 | |
273 | void QDesignerWidgetItem::deinstall() |
274 | { |
275 | QLayoutPrivate::widgetItemFactoryMethod = nullptr; |
276 | } |
277 | |
278 | const QLayout *QDesignerWidgetItem::containingLayout() const |
279 | { |
280 | if (!m_cachedContainingLayout) { |
281 | if (QWidget *parentWidget = constWidget()->parentWidget()) |
282 | if (QLayout *parentLayout = parentWidget->layout()) { |
283 | m_cachedContainingLayout = findLayoutOfItem(haystack: parentLayout, needle: this); |
284 | if (m_cachedContainingLayout) { |
285 | connect(sender: m_cachedContainingLayout, signal: &QObject::destroyed, |
286 | receiver: this, slot: &QDesignerWidgetItem::layoutChanged); |
287 | } |
288 | } |
289 | if (DebugWidgetItem) |
290 | qDebug() << Q_FUNC_INFO << " found " << m_cachedContainingLayout << " after reparenting " << constWidget(); |
291 | } |
292 | return m_cachedContainingLayout; |
293 | } |
294 | |
295 | void QDesignerWidgetItem::layoutChanged() |
296 | { |
297 | if (DebugWidgetItem) |
298 | qDebug() << Q_FUNC_INFO; |
299 | m_cachedContainingLayout = nullptr; |
300 | } |
301 | |
302 | bool QDesignerWidgetItem::eventFilter(QObject * /* watched */, QEvent *event) |
303 | { |
304 | if (event->type() == QEvent::ParentChange) |
305 | layoutChanged(); |
306 | return false; |
307 | } |
308 | |
309 | // ------------------ QDesignerWidgetItemInstaller |
310 | |
311 | int QDesignerWidgetItemInstaller::m_instanceCount = 0; |
312 | |
313 | QDesignerWidgetItemInstaller::QDesignerWidgetItemInstaller() |
314 | { |
315 | if (m_instanceCount++ == 0) { |
316 | if (DebugWidgetItem) |
317 | qDebug() << "QDesignerWidgetItemInstaller: installing" ; |
318 | QDesignerWidgetItem::install(); |
319 | } |
320 | } |
321 | |
322 | QDesignerWidgetItemInstaller::~QDesignerWidgetItemInstaller() |
323 | { |
324 | if (--m_instanceCount == 0) { |
325 | if (DebugWidgetItem) |
326 | qDebug() << "QDesignerWidgetItemInstaller: deinstalling" ; |
327 | QDesignerWidgetItem::deinstall(); |
328 | } |
329 | } |
330 | |
331 | } |
332 | |
333 | QT_END_NAMESPACE |
334 | |